/* roulang page: index */
:root {
  --brand: #2563EB;
  --brand-dark: #1E40AF;
  --brand-light: #F0F5FF;
  --accent: #D97706;
  --bg-white: #FFFFFF;
  --bg-gray: #F8FAFC;
  --bg-sub: #F1F5F9;
  --text-primary: #0F172A;
  --text-secondary: #334155;
  --text-muted: #64748B;
  --text-faint: #94A3B8;
  --border: #E2E8F0;
  --radius: 16px;
  --radius-sm: 12px;
  --radius-xs: 8px;
  --shadow: 0 8px 30px rgba(15,23,42,0.06);
  --shadow-hover: 0 16px 40px rgba(15,23,42,0.10);
  --shadow-lg: 0 20px 50px rgba(15,23,42,0.12);
  --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Source Han Sans SC', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body { font-family: var(--font-sans); color: var(--text-primary); line-height: 1.7; background: var(--bg-white); min-height: 100vh; overflow-x: hidden; }
img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: var(--transition); }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, select, textarea { font-family: inherit; }
.container-page { max-width: 1280px; margin-left: auto; margin-right: auto; padding-left: 1rem; padding-right: 1rem; }
section { position: relative; }
.section-pad { padding: 4rem 0; }
@media (min-width: 768px) { .section-pad { padding: 6rem 0; } }
.section-title { font-size: 2rem; font-weight: 700; color: var(--text-primary); line-height: 1.25; letter-spacing: -0.02em; margin-bottom: 1rem; }
.section-subtitle { font-size: 1.0625rem; color: var(--text-muted); max-width: 720px; line-height: 1.7; }
/* Header */
.site-header { position: fixed; top: 0; left: 0; right: 0; z-index: 100; background: rgba(255,255,255,0.98); border-bottom: 1px solid var(--border); backdrop-filter: blur(8px); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; gap: 1rem; }
.logo-wrap { display: flex; flex-direction: column; align-items: center; justify-content: center; line-height: 1.2; text-align: center; padding: 0.25rem 0; flex-shrink: 0; }
.logo-main { font-size: 1.25rem; font-weight: 800; color: var(--brand); letter-spacing: 0.01em; white-space: nowrap; }
.logo-sub { font-size: 0.7rem; color: var(--text-muted); letter-spacing: 0.18em; text-transform: uppercase; margin-top: 1px; }
.nav-left, .nav-right { display: none; align-items: center; gap: 0.25rem; }
.nav-link { display: inline-block; padding: 0.5rem 0.875rem; font-size: 0.9375rem; font-weight: 500; color: var(--text-secondary); border-radius: var(--radius-xs); position: relative; transition: var(--transition); }
.nav-link:hover { color: var(--brand); background: var(--brand-light); }
.nav-link.active { color: var(--brand); font-weight: 600; }
.nav-link.active::after { content: ''; position: absolute; bottom: 2px; left: 50%; transform: translateX(-50%); width: 20px; height: 2px; background: var(--brand); border-radius: 2px; }
.nav-cta { display: none; align-items: center; gap: 0.5rem; }
.btn-download-header { display: inline-flex; align-items: center; gap: 0.375rem; background: var(--brand); color: #fff; padding: 0.5rem 1.25rem; border-radius: var(--radius-xs); font-size: 0.875rem; font-weight: 600; transition: var(--transition); }
.btn-download-header:hover { background: var(--brand-dark); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(37,99,235,0.3); }
.menu-toggle { display: flex; align-items: center; justify-content: center; width: 44px; height: 44px; border-radius: var(--radius-xs); color: var(--text-primary); transition: var(--transition); }
.menu-toggle:hover { background: var(--brand-light); color: var(--brand); }
.mobile-menu { position: fixed; top: 72px; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--border); padding: 1.5rem 1rem; display: none; z-index: 99; box-shadow: var(--shadow); }
.mobile-menu.open { display: block; }
.mobile-menu-inner { display: flex; flex-direction: column; gap: 0.125rem; }
.mobile-link { padding: 0.75rem 1rem; font-size: 1rem; color: var(--text-secondary); border-radius: var(--radius-xs); font-weight: 500; }
.mobile-link:hover { background: var(--brand-light); color: var(--brand); }
.mobile-link.active { background: var(--brand-light); color: var(--brand); font-weight: 600; }
.mobile-download { margin-top: 1rem; display: grid; grid-template-columns: 1fr 1fr; gap: 0.5rem; padding-top: 1rem; border-top: 1px solid var(--border); }
/* Hero */
.hero { padding: 8.5rem 0 4.5rem; background: linear-gradient(180deg, #F0F5FF 0%, #FFFFFF 100%); position: relative; overflow: hidden; }
.hero::before { content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0; background-image: url('/assets/images/backpic/back-1.webp'); background-size: cover; background-position: center; opacity: 0.06; pointer-events: none; }
.hero-grid { display: grid; grid-template-columns: 1fr; gap: 3rem; align-items: center; position: relative; z-index: 2; }
@media (min-width: 992px) { .hero-grid { grid-template-columns: 1.1fr 0.9fr; gap: 4rem; } }
.hero-badge { display: inline-flex; align-items: center; gap: 0.5rem; background: rgba(37,99,235,0.08); color: var(--brand); font-size: 0.8125rem; font-weight: 600; padding: 0.375rem 0.875rem; border-radius: 999px; margin-bottom: 1.5rem; }
.hero h1 { font-size: 2.25rem; line-height: 1.2; font-weight: 800; color: var(--text-primary); letter-spacing: -0.02em; margin-bottom: 1.25rem; }
@media (min-width: 768px) { .hero h1 { font-size: 2.75rem; } }
.hero-desc { font-size: 1.0625rem; color: var(--text-secondary); max-width: 580px; line-height: 1.8; margin-bottom: 2rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-bottom: 1.5rem; }
.btn-primary { display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; background: var(--brand); color: #fff; padding: 0.8125rem 1.75rem; border-radius: var(--radius-sm); font-size: 1rem; font-weight: 600; transition: var(--transition); border: 2px solid transparent; }
.btn-primary:hover { background: var(--brand-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(37,99,235,0.3); }
.btn-primary:focus-visible, .btn-secondary:focus-visible { outline: 3px solid rgba(37,99,235,0.4); outline-offset: 2px; }
.btn-secondary { display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; background: #fff; color: var(--text-primary); padding: 0.8125rem 1.75rem; border-radius: var(--radius-sm); font-size: 1rem; font-weight: 600; border: 2px solid var(--border); transition: var(--transition); }
.btn-secondary:hover { border-color: var(--brand); color: var(--brand); transform: translateY(-2px); box-shadow: var(--shadow); }
.btn-ghost { display: inline-flex; align-items: center; gap: 0.25rem; color: var(--text-muted); font-size: 0.9375rem; font-weight: 500; padding: 0.5rem 0.75rem; }
.btn-ghost:hover { color: var(--brand); }
.hero-trust { display: flex; flex-wrap: wrap; align-items: center; gap: 1.25rem; font-size: 0.8125rem; color: var(--text-muted); margin-top: 1rem; }
.trust-item { display: inline-flex; align-items: center; gap: 0.375rem; }
.hero-visual { position: relative; }
.hero-card { background: #fff; border-radius: 24px; border: 1px solid var(--border); box-shadow: var(--shadow-lg); overflow: hidden; padding: 1.5rem; position: relative; }
.hero-card-img { border-radius: 16px; overflow: hidden; margin-bottom: 1rem; }
.hero-card-img img { width: 100%; height: 240px; object-fit: cover; }
@media (min-width: 768px) { .hero-card-img img { height: 300px; } }
.hero-card-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.75rem; }
.stat-box { background: var(--bg-gray); border-radius: var(--radius-sm); padding: 0.875rem; text-align: center; }
.stat-num { font-size: 1.375rem; font-weight: 700; color: var(--text-primary); font-family: var(--font-mono); line-height: 1.2; }
.stat-label { font-size: 0.75rem; color: var(--text-muted); margin-top: 0.25rem; }
/* Screenshot Carousel */
.carousel-section { background: var(--bg-gray); }
.carousel-wrap { position: relative; max-width: 960px; margin: 0 auto; }
.carousel-viewport { overflow: hidden; border-radius: 24px; background: #fff; border: 1px solid var(--border); box-shadow: var(--shadow); position: relative; }
.carousel-track { display: flex; transition: transform 0.5s ease; }
.carousel-slide { flex: 0 0 100%; padding: 1.5rem; }
.carousel-slide img { width: 100%; height: 360px; object-fit: cover; border-radius: 16px; border: 1px solid var(--border); }
@media (max-width: 640px) { .carousel-slide img { height: 240px; } }
.carousel-caption { padding: 1.25rem 0.5rem 0.25rem; text-align: center; }
.carousel-caption h3 { font-size: 1.125rem; font-weight: 600; color: var(--text-primary); margin-bottom: 0.375rem; }
.carousel-caption p { font-size: 0.9375rem; color: var(--text-muted); max-width: 560px; margin: 0 auto; }
.carousel-btn { position: absolute; top: 42%; transform: translateY(-50%); width: 44px; height: 44px; border-radius: 50%; background: #fff; border: 1px solid var(--border); box-shadow: var(--shadow); display: flex; align-items: center; justify-content: center; color: var(--text-secondary); transition: var(--transition); z-index: 10; }
.carousel-btn:hover { background: var(--brand); color: #fff; border-color: var(--brand); }
.carousel-btn.prev { left: -18px; }
.carousel-btn.next { right: -18px; }
@media (max-width: 640px) { .carousel-btn.prev { left: -8px; } .carousel-btn.next { right: -8px; } }
.carousel-dots { display: flex; justify-content: center; gap: 0.5rem; margin-top: 1.25rem; }
.dot { width: 8px; height: 8px; border-radius: 999px; background: #CBD5E1; transition: var(--transition); cursor: pointer; border: none; padding: 0; }
.dot.active { background: var(--brand); width: 24px; }
/* System Requirements */
.sys-grid { display: grid; grid-template-columns: 1fr; gap: 1.5rem; margin-top: 3rem; }
@media (min-width: 768px) { .sys-grid { grid-template-columns: 1fr 1fr; gap: 2rem; } }
.sys-card { background: #fff; border: 1px solid var(--border); border-radius: 20px; padding: 2rem; box-shadow: var(--shadow); transition: var(--transition); }
.sys-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }
.sys-header { display: flex; align-items: center; gap: 0.875rem; margin-bottom: 1.5rem; }
.sys-icon { width: 48px; height: 48px; border-radius: 14px; background: var(--brand-light); color: var(--brand); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.sys-title { font-size: 1.25rem; font-weight: 700; color: var(--text-primary); }
.sys-sub { font-size: 0.8125rem; color: var(--text-muted); }
.sys-list { list-style: none; padding: 0; margin: 0; }
.sys-list li { display: flex; align-items: flex-start; gap: 0.75rem; padding: 0.625rem 0; border-bottom: 1px solid var(--bg-sub); }
.sys-list li:last-child { border-bottom: none; }
.sys-label { flex: 0 0 72px; font-size: 0.875rem; color: var(--text-muted); }
.sys-value { font-size: 0.875rem; color: var(--text-primary); font-weight: 500; }
/* Reviews */
.review-grid { display: grid; grid-template-columns: 1fr; gap: 1.25rem; margin-top: 3rem; }
@media (min-width: 640px) { .review-grid { grid-template-columns: 1fr 1fr; } }
@media (min-width: 992px) { .review-grid { grid-template-columns: 1fr 1fr 1fr; } }
.review-card { background: #fff; border: 1px solid var(--border); border-radius: 20px; padding: 1.75rem; box-shadow: var(--shadow); transition: var(--transition); }
.review-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }
.review-head { display: flex; align-items: center; gap: 0.875rem; margin-bottom: 1rem; }
.review-avatar { width: 44px; height: 44px; border-radius: 50%; background: var(--brand-light); color: var(--brand); display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 1.125rem; flex-shrink: 0; }
.review-name { font-size: 0.9375rem; font-weight: 600; color: var(--text-primary); }
.review-source { font-size: 0.75rem; color: var(--text-faint); }
.review-stars { display: flex; gap: 2px; margin-bottom: 0.75rem; }
.review-stars svg { width: 16px; height: 16px; color: var(--accent); fill: var(--accent); }
.review-text { font-size: 0.9375rem; color: var(--text-secondary); line-height: 1.7; }
/* Download CTA */
.download-cta { background: var(--bg-gray); }
.download-inner { text-align: center; max-width: 760px; margin: 0 auto; }
.download-badge { display: inline-block; background: #FEF3C7; color: var(--accent); font-size: 0.8125rem; font-weight: 600; padding: 0.375rem 0.875rem; border-radius: 999px; margin-bottom: 1.25rem; }
.download-btns { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.875rem; margin-top: 2rem; }
.btn-download-lg { display: inline-flex; align-items: center; gap: 0.75rem; padding: 1rem 2rem; border-radius: 16px; font-size: 1rem; font-weight: 700; transition: var(--transition); }
.btn-download-lg.primary { background: var(--brand); color: #fff; box-shadow: 0 8px 24px rgba(37,99,235,0.25); }
.btn-download-lg.primary:hover { background: var(--brand-dark); transform: translateY(-3px); box-shadow: 0 12px 32px rgba(37,99,235,0.35); }
.btn-download-lg.secondary { background: #fff; color: var(--text-primary); border: 2px solid var(--border); }
.btn-download-lg.secondary:hover { border-color: var(--brand); color: var(--brand); transform: translateY(-3px); box-shadow: var(--shadow); }
.btn-download-lg.text { background: transparent; color: var(--text-muted); border: 2px solid transparent; padding: 0.875rem 1.5rem; font-size: 0.9375rem; font-weight: 600; }
.btn-download-lg.text:hover { color: var(--brand); background: var(--brand-light); }
.download-note { font-size: 0.8125rem; color: var(--text-faint); margin-top: 1.25rem; }
/* News List */
.news-list-wrap { max-width: 860px; margin: 0 auto; }
.news-item { display: flex; align-items: center; gap: 1.5rem; padding: 1.5rem 1rem; border-bottom: 1px solid var(--bg-sub); transition: var(--transition); border-radius: var(--radius-sm); }
.news-item:last-child { border-bottom: none; }
.news-item:hover { background: var(--brand-light); padding-left: 1.5rem; }
.news-item:hover .news-title { color: var(--brand); }
.news-left { flex-shrink: 0; display: flex; flex-direction: column; align-items: center; gap: 0.375rem; min-width: 74px; }
.news-date { font-size: 0.8125rem; color: var(--text-muted); font-family: var(--font-mono); font-weight: 600; }
.news-cat { font-size: 0.6875rem; background: var(--brand-light); color: var(--brand); padding: 0.1875rem 0.5rem; border-radius: 999px; font-weight: 600; }
.news-main { flex: 1; min-width: 0; }
.news-title { font-size: 1rem; font-weight: 600; color: var(--text-primary); margin-bottom: 0.25rem; transition: var(--transition); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.news-summary { font-size: 0.875rem; color: var(--text-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.news-arrow { flex-shrink: 0; color: var(--text-faint); transition: var(--transition); }
.news-item:hover .news-arrow { transform: translateX(6px); color: var(--brand); }
.news-empty { text-align: center; padding: 3rem 1rem; color: var(--text-muted); font-size: 0.9375rem; }
@media (max-width: 640px) {
  .news-item { flex-wrap: wrap; gap: 0.5rem; }
  .news-left { flex-direction: row; min-width: auto; gap: 0.5rem; }
  .news-title { white-space: normal; }
  .news-summary { white-space: normal; }
}
/* FAQ */
.faq-wrap { max-width: 760px; margin: 0 auto; }
.faq-item { background: #fff; border: 1px solid var(--border); border-radius: 16px; margin-bottom: 0.875rem; overflow: hidden; transition: var(--transition); }
.faq-item:hover { border-color: #BFDBFE; }
.faq-item.active { border-color: var(--brand); box-shadow: 0 4px 16px rgba(37,99,235,0.08); }
.faq-question { width: 100%; display: flex; align-items: center; justify-content: space-between; padding: 1.25rem 1.5rem; text-align: left; font-size: 1rem; font-weight: 600; color: var(--text-primary); gap: 1rem; }
.faq-question .faq-icon { flex-shrink: 0; width: 28px; height: 28px; border-radius: 50%; background: var(--brand-light); color: var(--brand); display: flex; align-items: center; justify-content: center; transition: var(--transition); }
.faq-item.active .faq-icon { background: var(--brand); color: #fff; transform: rotate(45deg); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; }
.faq-answer-inner { padding: 0 1.5rem 1.5rem; font-size: 0.9375rem; color: var(--text-secondary); line-height: 1.75; }
/* Final CTA */
.final-cta { background: #fff; }
.final-cta-inner { background: linear-gradient(135deg, var(--brand-light) 0%, #F8FAFC 100%); border: 1px solid var(--border); border-radius: 32px; padding: 3.5rem 2rem; text-align: center; position: relative; overflow: hidden; }
.final-cta-inner::before { content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0; background-image: url('/assets/images/backpic/back-2.webp'); background-size: cover; background-position: center; opacity: 0.04; pointer-events: none; }
.final-cta-inner h2 { font-size: 1.875rem; font-weight: 800; color: var(--text-primary); margin-bottom: 0.75rem; position: relative; z-index: 2; }
.final-cta-inner p { font-size: 1.0625rem; color: var(--text-muted); max-width: 560px; margin: 0 auto 2rem; position: relative; z-index: 2; }
/* Footer */
.site-footer { background: #fff; border-top: 1px solid var(--border); padding: 4rem 0 0; }
.footer-grid { display: grid; grid-template-columns: 1fr; gap: 2.5rem; padding-bottom: 3rem; }
@media (min-width: 768px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (min-width: 992px) { .footer-grid { grid-template-columns: 1.4fr 0.8fr 0.8fr 1fr; gap: 2rem; } }
.footer-brand .logo-wrap { align-items: flex-start; text-align: left; }
.footer-desc { font-size: 0.875rem; color: var(--text-muted); line-height: 1.7; margin-top: 1rem; max-width: 280px; }
.footer-title { font-size: 0.9375rem; font-weight: 700; color: var(--text-primary); margin-bottom: 1.25rem; }
.footer-links { list-style: none; padding: 0; }
.footer-links li { margin-bottom: 0.625rem; }
.footer-links a { font-size: 0.875rem; color: var(--text-muted); transition: var(--transition); }
.footer-links a:hover { color: var(--brand); padding-left: 4px; }
.footer-contact { font-size: 0.875rem; color: var(--text-muted); line-height: 2; }
.footer-contact a { color: var(--brand); font-weight: 500; }
.footer-bottom { border-top: 1px solid var(--border); padding: 1.5rem 0; }
.footer-bottom-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem; font-size: 0.8125rem; color: var(--text-faint); }
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--brand); }
/* Animation utility */
.fade-up { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-up.visible { opacity: 1; transform: translateY(0); }
@media (max-width: 991px) {
  .nav-left, .nav-right, .nav-cta { display: none; }
  .menu-toggle { display: flex; }
  .header-inner { justify-content: space-between; }
  .logo-wrap { margin-right: auto; }
}
@media (min-width: 992px) {
  .menu-toggle, .mobile-menu { display: none !important; }
  .nav-left { display: flex; }
  .nav-right { display: flex; }
  .nav-cta { display: flex; }
}

/* roulang page: article */
:root {
            --brand: #2563EB;
            --brand-dark: #1E40AF;
            --brand-light: #F0F5FF;
            --accent: #D97706;
            --bg: #FFFFFF;
            --bg-soft: #F8FAFC;
            --text-main: #0F172A;
            --text-sub: #334155;
            --text-muted: #64748B;
            --text-weak: #94A3B8;
            --border: #E2E8F0;
            --radius: 16px;
            --shadow: 0 8px 30px rgba(15, 23, 42, 0.06);
            --shadow-hover: 0 16px 40px rgba(15, 23, 42, 0.10);
            --font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC", sans-serif;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-main);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
        }

        img {
            max-width: 100%;
            display: block;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
        }

        button {
            font-family: var(--font-family);
            cursor: pointer;
            border: none;
            background: none;
        }

        input,
        textarea {
            font-family: var(--font-family);
        }

        .container-page {
            max-width: 1280px;
            margin: 0 auto;
            padding-left: 32px;
            padding-right: 32px;
        }

        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(255, 255, 255, 0.96);
            border-bottom: 1px solid var(--border);
            backdrop-filter: none;
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            padding-top: 14px;
            padding-bottom: 14px;
        }

        .nav-left,
        .nav-right {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .nav-link {
            padding: 8px 14px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-sub);
            border-radius: 10px;
            border-bottom: 2px solid transparent;
            transition: color 0.2s, background 0.2s, border-color 0.2s;
        }

        .nav-link:hover {
            color: var(--brand);
            background: var(--brand-light);
        }

        .nav-link.active {
            color: var(--brand);
            border-bottom-color: var(--brand);
            font-weight: 600;
        }

        .logo-wrap {
            display: flex;
            flex-direction: column;
            align-items: center;
            line-height: 1.1;
            letter-spacing: 0.5px;
        }

        .logo-main {
            font-size: 20px;
            font-weight: 700;
            color: var(--brand);
        }

        .logo-sub {
            font-size: 12px;
            font-weight: 500;
            color: var(--text-muted);
            letter-spacing: 2px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-size: 15px;
            font-weight: 600;
            padding: 12px 24px;
            border-radius: 12px;
            transition: background-color 0.2s, border-color 0.2s, transform 0.2s, box-shadow 0.2s;
            border: 1px solid transparent;
        }

        .btn:focus-visible {
            outline: 3px solid rgba(37, 99, 235, 0.35);
            outline-offset: 2px;
        }

        .btn-primary {
            background: var(--brand);
            color: #fff;
            box-shadow: 0 6px 16px rgba(37, 99, 235, 0.18);
        }

        .btn-primary:hover {
            background: var(--brand-dark);
            transform: translateY(-2px);
            box-shadow: 0 10px 24px rgba(30, 64, 175, 0.25);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 4px 10px rgba(30, 64, 175, 0.18);
        }

        .btn-secondary {
            background: var(--bg);
            color: var(--text-main);
            border-color: var(--border);
        }

        .btn-secondary:hover {
            border-color: var(--brand);
            color: var(--brand);
            transform: translateY(-2px);
            box-shadow: var(--shadow);
        }

        .btn-secondary:active {
            transform: translateY(0);
        }

        .btn-sm {
            padding: 8px 16px;
            font-size: 14px;
            border-radius: 10px;
        }

        .badge {
            display: inline-block;
            padding: 4px 14px;
            font-size: 13px;
            font-weight: 600;
            color: var(--brand);
            background: var(--brand-light);
            border-radius: 999px;
            letter-spacing: 0.3px;
        }

        .menu-toggle {
            display: none;
            flex-direction: column;
            justify-content: center;
            gap: 5px;
            padding: 8px;
            border-radius: 8px;
            transition: background 0.2s;
        }

        .menu-toggle:hover {
            background: var(--brand-light);
        }

        .menu-toggle span {
            display: block;
            width: 22px;
            height: 2px;
            background: var(--text-main);
            border-radius: 2px;
            transition: all 0.3s;
        }

        .menu-toggle.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }

        .menu-toggle.open span:nth-child(2) {
            opacity: 0;
        }

        .menu-toggle.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        .mobile-menu {
            display: none;
            background: #fff;
            border-bottom: 1px solid var(--border);
            padding: 12px 20px 20px;
            box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
        }

        .mobile-menu.open {
            display: block;
        }

        .mobile-menu .mobile-nav-list {
            display: flex;
            flex-direction: column;
            gap: 4px;
            margin-bottom: 12px;
        }

        .mobile-menu .nav-link {
            padding: 12px 16px;
            font-size: 16px;
            display: block;
            border-bottom: none;
            border-radius: 10px;
        }

        .mobile-menu .nav-link.active {
            background: var(--brand-light);
            color: var(--brand);
        }

        .mobile-menu .btn {
            width: 100%;
            margin-top: 6px;
        }

        .page-banner {
            position: relative;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            padding: 56px 0 64px;
        }

        .page-banner::before {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(100deg, rgba(240, 245, 255, 0.94) 20%, rgba(240, 245, 255, 0.7) 60%, rgba(255, 255, 255, 0.5));
        }

        .page-banner .container-page {
            position: relative;
            z-index: 1;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 6px;
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 16px;
        }

        .breadcrumb a {
            color: var(--text-muted);
        }

        .breadcrumb a:hover {
            color: var(--brand);
        }

        .breadcrumb-sep {
            color: var(--text-weak);
        }

        .breadcrumb-current {
            color: var(--text-sub);
            max-width: 320px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .banner-category {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .article-section {
            padding: 40px 0 56px;
        }

        .container-article {
            max-width: 860px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .article-header {
            text-align: left;
            margin-bottom: 36px;
        }

        .article-header .badge {
            margin-bottom: 14px;
        }

        .article-header h1 {
            font-size: 38px;
            line-height: 1.3;
            font-weight: 700;
            color: var(--text-main);
            margin: 12px 0 16px;
            letter-spacing: 0.5px;
        }

        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 18px;
            font-size: 14px;
            color: var(--text-muted);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
            padding: 12px 0;
            margin-bottom: 20px;
        }

        .article-meta span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .article-summary {
            font-size: 16px;
            line-height: 1.8;
            color: var(--text-sub);
            background: var(--bg-soft);
            padding: 16px 20px;
            border-radius: 12px;
            border-left: 4px solid var(--brand);
        }

        .article-body {
            font-size: 16px;
            line-height: 1.85;
            color: var(--text-main);
            word-wrap: break-word;
        }

        .article-body h2 {
            font-size: 28px;
            font-weight: 700;
            margin: 48px 0 18px;
            padding-bottom: 10px;
            border-bottom: 1px solid var(--border);
            line-height: 1.4;
        }

        .article-body h3 {
            font-size: 22px;
            font-weight: 600;
            margin: 32px 0 14px;
            line-height: 1.4;
        }

        .article-body p {
            margin-bottom: 20px;
        }

        .article-body ul,
        .article-body ol {
            margin: 0 0 24px 22px;
        }

        .article-body li {
            margin-bottom: 8px;
        }

        .article-body blockquote {
            margin: 24px 0;
            padding: 16px 22px;
            background: var(--brand-light);
            border-left: 4px solid var(--brand);
            border-radius: 8px;
            color: var(--text-sub);
        }

        .article-body blockquote p {
            margin-bottom: 0;
        }

        .article-body img {
            border-radius: 12px;
            border: 1px solid var(--border);
            margin: 28px auto;
        }

        .article-body a {
            color: var(--brand);
            border-bottom: 1px solid rgba(37, 99, 235, 0.3);
        }

        .article-body a:hover {
            color: var(--brand-dark);
            border-bottom-color: var(--brand-dark);
        }

        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 28px 0;
            font-size: 15px;
        }

        .article-body th,
        .article-body td {
            border: 1px solid var(--border);
            padding: 10px 14px;
            text-align: left;
        }

        .article-body th {
            background: var(--bg-soft);
            font-weight: 600;
        }

        .article-not-found {
            max-width: 720px;
            margin: 80px auto;
            text-align: center;
            padding: 40px 24px;
            background: var(--bg-soft);
            border-radius: var(--radius);
            border: 1px solid var(--border);
        }

        .article-not-found h1 {
            font-size: 32px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .article-not-found p {
            color: var(--text-muted);
            margin-bottom: 28px;
        }

        .related-section {
            padding: 56px 0 64px;
            background: var(--bg-soft);
        }

        .related-header {
            text-align: center;
            margin-bottom: 40px;
        }

        .related-header .badge {
            margin-bottom: 10px;
        }

        .related-header h2 {
            font-size: 30px;
            font-weight: 700;
        }

        .related-header p {
            color: var(--text-muted);
            font-size: 15px;
            margin-top: 8px;
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .related-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: box-shadow 0.3s, transform 0.3s;
            display: flex;
            flex-direction: column;
        }

        .related-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }

        .related-card img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-bottom: 1px solid var(--border);
        }

        .related-card-body {
            padding: 20px 22px 22px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .related-card-body .badge {
            align-self: flex-start;
            margin-bottom: 12px;
        }

        .related-card-body h3 {
            font-size: 19px;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .related-card-body p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        .related-card-body .card-link {
            margin-top: auto;
            padding-top: 16px;
            font-size: 14px;
            font-weight: 600;
            color: var(--brand);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .related-card:hover .card-link {
            gap: 10px;
        }

        .cta-section {
            padding: 64px 0;
            background: #fff;
        }

        .cta-inner {
            text-align: center;
            max-width: 760px;
            margin: 0 auto;
            padding: 40px 24px;
            background: var(--brand-light);
            border-radius: 24px;
            border: 1px solid #DCE7FF;
        }

        .cta-inner h2 {
            font-size: 30px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 12px;
        }

        .cta-inner p {
            color: var(--text-muted);
            font-size: 15px;
            margin-bottom: 28px;
        }

        .cta-buttons {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 16px;
        }

        .site-footer {
            background: #fff;
            border-top: 1px solid var(--border);
            padding: 56px 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
            gap: 40px;
            padding-bottom: 36px;
        }

        .footer-brand .logo-wrap {
            align-items: flex-start;
            text-align: left;
            margin-bottom: 12px;
        }

        .footer-desc {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            margin-top: 10px;
        }

        .footer-title {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 14px;
        }

        .footer-links {
            list-style: none;
        }

        .footer-links li {
            margin-bottom: 10px;
        }

        .footer-links a {
            font-size: 14px;
            color: var(--text-muted);
            transition: color 0.2s;
        }

        .footer-links a:hover {
            color: var(--brand);
        }

        .footer-contact p {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 10px;
        }

        .footer-contact a {
            color: var(--text-sub);
        }

        .footer-contact a:hover {
            color: var(--brand);
        }

        .footer-bottom {
            border-top: 1px solid var(--border);
            padding: 18px 0;
        }

        .footer-bottom-inner {
            display: flex;
            justify-content: space-between;
            gap: 16px;
            flex-wrap: wrap;
            font-size: 13px;
            color: var(--text-weak);
        }

        .footer-bottom-inner a {
            color: var(--text-muted);
        }

        .footer-bottom-inner a:hover {
            color: var(--brand);
        }

        @media (max-width: 1024px) {
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .container-page {
                padding-left: 20px;
                padding-right: 20px;
            }

            .nav-left,
            .nav-right {
                display: none;
            }

            .menu-toggle {
                display: flex;
            }

            .header-inner {
                position: relative;
            }

            .logo-wrap {
                position: absolute;
                left: 50%;
                transform: translateX(-50%);
            }

            .page-banner {
                padding: 40px 0 48px;
            }

            .article-header h1 {
                font-size: 28px;
            }

            .article-body {
                font-size: 15px;
            }

            .article-body h2 {
                font-size: 24px;
            }

            .article-body h3 {
                font-size: 20px;
            }

            .related-grid {
                grid-template-columns: 1fr;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }

        @media (max-width: 520px) {
            .container-page {
                padding-left: 16px;
                padding-right: 16px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }

            .cta-buttons {
                flex-direction: column;
                align-items: stretch;
            }

            .cta-buttons .btn {
                width: 100%;
            }

            .article-meta {
                gap: 10px;
                flex-direction: column;
            }
        }

/* roulang page: category1 */
:root {
            --brand: #2563EB;
            --brand-dark: #1E40AF;
            --brand-light: #F0F5FF;
            --accent: #D97706;
            --bg-body: #FFFFFF;
            --bg-soft: #F8FAFC;
            --bg-input: #F1F5F9;
            --text-main: #0F172A;
            --text-secondary: #334155;
            --text-muted: #64748B;
            --text-faint: #94A3B8;
            --border: #E2E8F0;
            --radius: 16px;
            --radius-sm: 12px;
            --shadow-card: 0 8px 30px rgba(15, 23, 42, 0.06);
            --shadow-card-hover: 0 16px 40px rgba(15, 23, 42, 0.10);
            --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC", sans-serif;
            --font-mono: "JetBrains Mono", "SF Mono", "Roboto Mono", "Consolas", monospace;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-main);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
        }

        .container-page {
            max-width: 1280px;
            margin: 0 auto;
            padding-left: 16px;
            padding-right: 16px;
        }

        @media (min-width: 768px) {
            .container-page {
                padding-left: 24px;
                padding-right: 24px;
            }
        }

        @media (min-width: 1024px) {
            .container-page {
                padding-left: 32px;
                padding-right: 32px;
            }
        }

        .section {
            padding: 64px 0;
        }

        @media (min-width: 768px) {
            .section {
                padding: 96px 0;
            }
        }

        /* ===== Header & Nav ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.98);
            border-bottom: 1px solid var(--border);
        }

        .nav-wrap {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
            gap: 16px;
        }

        .nav-left,
        .nav-right {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .nav-link {
            display: inline-flex;
            align-items: center;
            padding: 8px 14px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: 8px;
            position: relative;
            transition: color 0.2s ease, background 0.2s ease;
        }

        .nav-link:hover {
            color: var(--brand);
            background: var(--brand-light);
        }

        .nav-link.active {
            color: var(--brand);
            font-weight: 600;
        }

        .nav-link.active::after {
            content: "";
            position: absolute;
            left: 14px;
            right: 14px;
            bottom: 2px;
            height: 2px;
            border-radius: 2px;
            background: var(--brand);
        }

        .btn-download-nav {
            display: inline-flex;
            align-items: center;
            margin-left: 8px;
            padding: 8px 18px;
            font-size: 14px;
            font-weight: 600;
            color: #fff;
            background: var(--brand);
            border-radius: 999px;
            transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
        }

        .btn-download-nav:hover {
            background: var(--brand-dark);
            transform: translateY(-1px);
            box-shadow: 0 6px 16px rgba(37, 99, 235, 0.25);
        }

        .btn-download-nav:focus-visible {
            outline: 3px solid rgba(37, 99, 235, 0.4);
            outline-offset: 2px;
        }

        .logo-wrap {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            line-height: 1.15;
            text-decoration: none;
            padding: 4px 10px;
            border-radius: 8px;
            transition: background 0.2s ease;
            flex-shrink: 0;
        }

        .logo-wrap:hover {
            background: var(--brand-light);
        }

        .logo-main {
            font-size: 22px;
            font-weight: 800;
            color: var(--text-main);
            letter-spacing: 0.5px;
        }

        .logo-sub {
            font-size: 11px;
            font-weight: 600;
            color: var(--brand);
            letter-spacing: 5px;
            text-transform: uppercase;
            margin-top: 1px;
        }

        /* Menu Toggle (mobile) */
        .menu-toggle {
            display: none;
            flex-direction: column;
            justify-content: center;
            gap: 5px;
            width: 44px;
            height: 44px;
            padding: 10px;
            border-radius: 8px;
            transition: background 0.2s ease;
        }

        .menu-toggle:hover {
            background: var(--brand-light);
        }

        .menu-toggle span {
            display: block;
            height: 2px;
            width: 100%;
            background: var(--text-main);
            border-radius: 2px;
            transition: transform 0.3s ease, opacity 0.3s ease;
        }

        .menu-toggle.is-active span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }

        .menu-toggle.is-active span:nth-child(2) {
            opacity: 0;
        }

        .menu-toggle.is-active span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* Mobile Menu Panel */
        .mobile-menu {
            display: none;
            flex-direction: column;
            background: #fff;
            border-top: 1px solid var(--border);
            padding: 16px 24px 24px;
            box-shadow: 0 20px 40px rgba(15, 23, 42, 0.08);
        }

        .mobile-menu.open {
            display: flex;
        }

        .mobile-menu .nav-link {
            padding: 14px 8px;
            font-size: 16px;
            border-bottom: 1px solid var(--bg-input);
            border-radius: 0;
        }

        .mobile-menu .nav-link.active::after {
            display: none;
        }

        .mobile-menu .nav-link.active {
            background: var(--brand-light);
            border-radius: 8px;
            padding-left: 14px;
        }

        .mobile-menu .btn-download-nav {
            margin: 16px 0 0;
            justify-content: center;
            padding: 12px 20px;
            font-size: 15px;
        }

        @media (max-width: 1023px) {
            .nav-left,
            .nav-right {
                display: none;
            }

            .menu-toggle {
                display: flex;
            }

            .nav-wrap {
                height: 64px;
            }
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            background:
                linear-gradient(135deg, rgba(240, 245, 255, 0.96) 0%, rgba(255, 255, 255, 0.98) 60%),
                url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            padding: 72px 0 64px;
            border-bottom: 1px solid var(--bg-input);
        }

        @media (min-width: 768px) {
            .hero {
                padding: 96px 0 80px;
            }
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 48px;
            align-items: center;
        }

        @media (min-width: 1024px) {
            .hero-grid {
                grid-template-columns: 1.15fr 0.85fr;
                gap: 64px;
            }
        }

        .hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: 999px;
            padding: 6px 16px;
            font-size: 13px;
            font-weight: 600;
            color: var(--brand);
            box-shadow: 0 2px 8px rgba(15, 23, 42, 0.04);
            margin-bottom: 24px;
        }

        .hero-tag::before {
            content: "";
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--brand);
        }

        .hero h1 {
            font-size: 38px;
            line-height: 1.2;
            font-weight: 800;
            color: var(--text-main);
            letter-spacing: 0.5px;
        }

        @media (min-width: 768px) {
            .hero h1 {
                font-size: 44px;
            }
        }

        .hero-desc {
            margin-top: 20px;
            font-size: 16px;
            line-height: 1.8;
            color: var(--text-secondary);
            max-width: 560px;
        }

        .anchor-row {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 32px;
        }

        .anchor-link {
            display: inline-flex;
            align-items: center;
            padding: 8px 18px;
            border: 1px solid var(--border);
            border-radius: 999px;
            background: #fff;
            color: var(--text-secondary);
            font-size: 14px;
            font-weight: 500;
            transition: all 0.2s ease;
        }

        .anchor-link:hover {
            border-color: var(--brand);
            color: var(--brand);
            background: var(--brand-light);
            transform: translateY(-1px);
        }

        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            margin-top: 32px;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 26px;
            background: var(--brand);
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            border-radius: var(--radius-sm);
            transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
            box-shadow: 0 4px 14px rgba(37, 99, 235, 0.2);
        }

        .btn-primary:hover {
            background: var(--brand-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(37, 99, 235, 0.28);
        }

        .btn-primary:focus-visible,
        .btn-secondary:focus-visible {
            outline: 3px solid rgba(37, 99, 235, 0.35);
            outline-offset: 3px;
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 26px;
            background: #fff;
            color: var(--text-secondary);
            font-size: 15px;
            font-weight: 600;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            transition: all 0.2s ease;
        }

        .btn-secondary:hover {
            border-color: var(--brand);
            color: var(--brand);
            transform: translateY(-2px);
        }

        .hero-image-wrap {
            position: relative;
            border-radius: 20px;
            overflow: hidden;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            background: #fff;
        }

        .hero-image-wrap img {
            width: 100%;
            height: auto;
            aspect-ratio: 4/3;
            object-fit: cover;
        }

        .hero-badge {
            position: absolute;
            top: 18px;
            right: 18px;
            background: rgba(15, 23, 42, 0.72);
            backdrop-filter: blur(6px);
            color: #fff;
            font-size: 13px;
            font-weight: 600;
            padding: 6px 14px;
            border-radius: 999px;
            letter-spacing: 0.3px;
        }

        /* ===== Section Titles ===== */
        .section-head {
            max-width: 720px;
            margin: 0 auto 48px;
            text-align: center;
        }

        .section-head h2 {
            font-size: 30px;
            font-weight: 800;
            line-height: 1.3;
            color: var(--text-main);
        }

        .section-head p {
            margin-top: 14px;
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        .section-head-light h2 {
            color: #fff;
        }

        .section-head-light p {
            color: rgba(255, 255, 255, 0.78);
        }

        /* ===== Feature Cards ===== */
        .feature-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 24px;
        }

        @media (min-width: 640px) {
            .feature-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (min-width: 1024px) {
            .feature-grid {
                grid-template-columns: repeat(4, 1fr);
                gap: 28px;
            }
        }

        .feature-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 32px 24px;
            transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
        }

        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
            border-color: #dbeafe;
        }

        .feature-icon {
            width: 50px;
            height: 50px;
            border-radius: 14px;
            background: var(--brand-light);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--brand);
            margin-bottom: 20px;
        }

        .feature-card h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 10px;
        }

        .feature-card p {
            font-size: 14px;
            line-height: 1.75;
            color: var(--text-muted);
        }

        /* ===== Alternate Blocks ===== */
        .alternate-list {
            display: flex;
            flex-direction: column;
            gap: 80px;
        }

        @media (min-width: 768px) {
            .alternate-list {
                gap: 96px;
            }
        }

        .alternate-block {
            display: grid;
            grid-template-columns: 1fr;
            gap: 40px;
            align-items: center;
        }

        @media (min-width: 1024px) {
            .alternate-block {
                grid-template-columns: 1fr 1fr;
                gap: 64px;
            }

            .alternate-block.reverse .alternate-image-wrap {
                order: 2;
            }
        }

        .alternate-image-wrap {
            border-radius: 20px;
            overflow: hidden;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            background: var(--brand-light);
        }

        .alternate-image-wrap img {
            width: 100%;
            height: auto;
            aspect-ratio: 16/10;
            object-fit: cover;
        }

        .alternate-content .label {
            display: inline-block;
            font-size: 13px;
            font-weight: 700;
            color: var(--brand);
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 12px;
        }

        .alternate-content h3 {
            font-size: 26px;
            font-weight: 800;
            line-height: 1.35;
            color: var(--text-main);
            margin-bottom: 16px;
        }

        .alternate-content>p {
            font-size: 15px;
            line-height: 1.8;
            color: var(--text-secondary);
            margin-bottom: 24px;
        }

        .check-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .check-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        .check-list li svg {
            flex-shrink: 0;
            margin-top: 3px;
            color: var(--brand);
        }

        /* ===== Metrics ===== */
        .metrics-section {
            background: var(--brand-light);
        }

        .metrics-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px 24px;
        }

        @media (min-width: 768px) {
            .metrics-grid {
                grid-template-columns: repeat(4, 1fr);
            }
        }

        .metric-item {
            text-align: center;
            padding: 16px 8px;
        }

        .metric-num {
            font-family: var(--font-mono);
            font-size: 32px;
            font-weight: 800;
            color: var(--brand);
            line-height: 1.2;
            letter-spacing: -0.5px;
        }

        .metric-item .metric-label {
            margin-top: 8px;
            font-size: 14px;
            color: var(--text-secondary);
        }

        /* ===== Scenarios ===== */
        .scenario-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 24px;
        }

        @media (min-width: 768px) {
            .scenario-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        .scenario-card {
            background: var(--bg-soft);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 28px 24px;
            transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
        }

        .scenario-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-card);
            background: #fff;
        }

        .scenario-card .step-badge {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: var(--brand);
            color: #fff;
            font-weight: 700;
            font-size: 16px;
            margin-bottom: 16px;
        }

        .scenario-card h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 10px;
        }

        .scenario-card p {
            font-size: 14px;
            line-height: 1.75;
            color: var(--text-muted);
        }

        /* ===== Steps ===== */
        .steps-section {
            background: var(--bg-soft);
        }

        .steps-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
        }

        @media (min-width: 768px) {
            .steps-grid {
                grid-template-columns: repeat(4, 1fr);
                gap: 24px;
            }
        }

        .step-item {
            position: relative;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 28px 24px;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .step-item:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-card);
        }

        .step-num {
            font-family: var(--font-mono);
            font-size: 36px;
            font-weight: 800;
            color: var(--brand-light);
            line-height: 1;
            margin-bottom: 14px;
        }

        .step-item h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 8px;
        }

        .step-item p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            border: 1px solid var(--border);
            border-radius: 16px;
            background: #fff;
            margin-bottom: 14px;
            overflow: hidden;
            transition: border-color 0.3s ease, box-shadow 0.3s ease;
        }

        .faq-item.open {
            border-color: #bfdbfe;
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.06);
        }

        .faq-q {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            padding: 20px 24px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-main);
            cursor: pointer;
            transition: color 0.2s ease;
        }

        .faq-q:hover {
            color: var(--brand);
        }

        .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--brand-light);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--brand);
            font-size: 18px;
            font-weight: 300;
            transition: transform 0.3s ease, background 0.3s ease;
            line-height: 1;
        }

        .faq-item.open .faq-icon {
            transform: rotate(45deg);
            background: var(--brand);
            color: #fff;
        }

        .faq-a {
            padding: 0 24px 22px;
            font-size: 15px;
            line-height: 1.75;
            color: var(--text-secondary);
            display: none;
        }

        .faq-item.open .faq-a {
            display: block;
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 64px 0;
        }

        .cta-box {
            background: var(--brand-light);
            border: 1px solid #dbeafe;
            border-radius: 24px;
            padding: 48px 32px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        @media (min-width: 768px) {
            .cta-box {
                padding: 64px 48px;
            }
        }

        .cta-box::after {
            content: "";
            position: absolute;
            right: -60px;
            top: -60px;
            width: 180px;
            height: 180px;
            border-radius: 50%;
            background: rgba(37, 99, 235, 0.06);
            pointer-events: none;
        }

        .cta-box h2 {
            font-size: 30px;
            font-weight: 800;
            color: var(--text-main);
            line-height: 1.3;
        }

        .cta-box p {
            margin-top: 14px;
            font-size: 15px;
            color: var(--text-secondary);
            max-width: 480px;
            margin-left: auto;
            margin-right: auto;
        }

        .cta-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            justify-content: center;
            margin-top: 32px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-soft);
            border-top: 1px solid var(--border);
            padding: 64px 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 40px;
            padding-bottom: 48px;
        }

        @media (min-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 40px;
            }
        }

        @media (min-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1.4fr 1fr 1fr 1fr;
                gap: 48px;
            }
        }

        .footer-brand .logo-wrap {
            align-items: flex-start;
            padding: 0;
            margin-bottom: 16px;
        }

        .footer-brand .logo-wrap:hover {
            background: transparent;
        }

        .footer-desc {
            font-size: 14px;
            line-height: 1.75;
            color: var(--text-muted);
            max-width: 320px;
        }

        .footer-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 18px;
        }

        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-links a {
            font-size: 14px;
            color: var(--text-secondary);
            transition: color 0.2s ease;
        }

        .footer-links a:hover {
            color: var(--brand);
        }

        .footer-contact p {
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 8px;
            line-height: 1.7;
        }

        .footer-contact a {
            color: var(--brand);
            font-weight: 500;
        }

        .footer-bottom {
            border-top: 1px solid var(--border);
            padding: 20px 0;
        }

        .footer-bottom-inner {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-faint);
        }

        .footer-bottom-inner a {
            color: var(--text-muted);
        }

        .footer-bottom-inner a:hover {
            color: var(--brand);
        }

        /* ===== Responsive Utilities ===== */
        @media (max-width: 520px) {
            .hero h1 {
                font-size: 30px;
            }

            .section-head h2 {
                font-size: 24px;
            }

            .alternate-content h3 {
                font-size: 22px;
            }

            .metric-num {
                font-size: 26px;
            }

            .cta-box h2 {
                font-size: 24px;
            }

            .btn-primary,
            .btn-secondary {
                width: 100%;
            }

            .hero-actions,
            .cta-actions {
                flex-direction: column;
            }
        }

/* roulang page: category3 */
:root {
  --brand: #2563EB;
  --brand-dark: #1E40AF;
  --brand-light: #F0F5FF;
  --accent: #D97706;
  --bg-main: #FFFFFF;
  --bg-section: #F8FAFC;
  --bg-subtle: #F1F5F9;
  --text-main: #0F172A;
  --text-secondary: #334155;
  --text-muted: #64748B;
  --text-faint: #94A3B8;
  --border: #E2E8F0;
  --radius-lg: 16px;
  --radius-md: 12px;
  --shadow-card: 0 8px 30px rgba(15,23,42,0.06);
  --shadow-card-hover: 0 16px 40px rgba(15,23,42,0.10);
  --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Source Han Sans SC', sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font-sans);color:var(--text-main);background:var(--bg-main);line-height:1.7;font-size:16px;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer}
.container-page{max-width:1280px;margin:0 auto;padding-left:16px;padding-right:16px}
@media(min-width:768px){.container-page{padding-left:32px;padding-right:32px}}
.section-head{text-align:center;max-width:640px;margin:0 auto 48px}
.section-tag{display:inline-block;background:var(--brand-light);color:var(--brand);font-size:13px;font-weight:600;padding:4px 14px;border-radius:999px;margin-bottom:14px;letter-spacing:0.02em}
.section-title{font-size:28px;font-weight:700;line-height:1.3;color:var(--text-main);margin-bottom:10px}
@media(min-width:768px){.section-title{font-size:30px}}
.section-desc{font-size:15px;color:var(--text-muted);line-height:1.7}

/* ===== Header ===== */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,0.97);border-bottom:1px solid var(--border)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px;position:relative}
.logo-wrap{display:inline-flex;flex-direction:column;align-items:center;line-height:1.2;text-align:center;position:absolute;left:50%;transform:translateX(-50%);transition:opacity .2s}
.logo-wrap:hover{opacity:.85}
.logo-main{font-size:20px;font-weight:800;color:var(--text-main);letter-spacing:0.01em}
.logo-sub{font-size:11px;font-weight:500;color:var(--brand);letter-spacing:0.08em}
.nav-left,.nav-right{display:none;align-items:center;gap:28px}
@media(min-width:1024px){.nav-left,.nav-right{display:flex}}
.nav-link{position:relative;font-size:15px;font-weight:500;color:var(--text-secondary);padding:8px 2px;transition:color .2s}
.nav-link::after{content:'';position:absolute;left:0;bottom:0;width:100%;height:2px;background:var(--brand);border-radius:2px;transform:scaleX(0);transform-origin:center;transition:transform .25s ease}
.nav-link:hover{color:var(--brand)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link.active{color:var(--brand);font-weight:600}
.nav-link.active::after{transform:scaleX(1)}
.nav-download{background:var(--brand);color:#fff;font-size:14px;font-weight:600;padding:8px 20px;border-radius:999px;transition:background .2s,transform .2s,box-shadow .2s}
.nav-download:hover{background:var(--brand-dark);transform:translateY(-1px);box-shadow:0 6px 18px rgba(37,99,235,0.25)}
.nav-toggle{display:inline-flex;align-items:center;justify-content:center;width:42px;height:42px;border:1px solid var(--border);border-radius:10px;background:#fff;color:var(--text-main);transition:border-color .2s}
.nav-toggle:hover{border-color:var(--brand)}
@media(min-width:1024px){.nav-toggle{display:none}}
.mobile-menu{display:none;flex-direction:column;padding:18px 16px 24px;border-top:1px solid var(--border);background:#fff}
.mobile-menu.open{display:flex}
.mobile-link{padding:12px 6px;font-size:15px;font-weight:500;color:var(--text-secondary);border-bottom:1px solid var(--bg-subtle);transition:color .2s,padding-left .2s}
.mobile-link:hover{color:var(--brand);padding-left:12px}
.mobile-link.active{color:var(--brand);font-weight:600}
.mobile-download{margin-top:16px;background:var(--brand);color:#fff;text-align:center;font-weight:600;padding:12px 20px;border-radius:12px;font-size:15px;transition:background .2s}
.mobile-download:hover{background:var(--brand-dark)}

/* ===== Category Banner ===== */
.category-banner{position:relative;min-height:320px;display:flex;align-items:flex-end;overflow:hidden}
.banner-bg{position:absolute;inset:0;background-size:cover;background-position:center}
.banner-overlay{position:absolute;inset:0;background:linear-gradient(to bottom,rgba(240,245,255,0.72),rgba(248,250,252,0.94))}
.banner-content{position:relative;z-index:2;padding-top:80px;padding-bottom:48px}
.breadcrumb{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-muted);margin-bottom:18px}
.breadcrumb a{transition:color .2s}
.breadcrumb a:hover{color:var(--brand)}
.breadcrumb-sep{color:var(--text-faint)}
.banner-title{font-size:36px;font-weight:800;color:var(--text-main);line-height:1.2;margin-bottom:12px;letter-spacing:-0.01em}
@media(min-width:768px){.banner-title{font-size:44px}}
.banner-subtitle{font-size:16px;color:var(--text-secondary);max-width:560px;line-height:1.7}
@media(min-width:768px){.banner-subtitle{font-size:17px}}

/* ===== Intro ===== */
.intro-section{padding:48px 0 8px}
.intro-inner{max-width:760px;margin:0 auto}
.intro-text{font-size:16px;color:var(--text-secondary);line-height:1.85;text-align:center}

/* ===== Anchor ===== */
.anchor-section{padding:36px 0 8px}
.anchor-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
@media(min-width:768px){.anchor-grid{grid-template-columns:repeat(4,1fr)}}
.anchor-card{display:flex;align-items:center;gap:12px;background:var(--bg-main);border:1px solid var(--border);border-radius:var(--radius-md);padding:18px 20px;box-shadow:var(--shadow-card);transition:transform .25s,box-shadow .25s,border-color .25s}
.anchor-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-card-hover);border-color:var(--brand)}
.anchor-num{font-size:12px;font-weight:700;color:var(--brand);background:var(--brand-light);border-radius:8px;padding:4px 8px;letter-spacing:0.03em}
.anchor-title{font-size:15px;font-weight:600;color:var(--text-main)}

/* ===== Coverage ===== */
.coverage-section{padding:56px 0 32px}
.coverage-grid{display:grid;grid-template-columns:1fr;gap:20px}
@media(min-width:640px){.coverage-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.coverage-grid{grid-template-columns:repeat(4,1fr)}}
.coverage-card{background:var(--bg-main);border:1px solid var(--border);border-radius:var(--radius-lg);padding:28px 24px;box-shadow:var(--shadow-card);transition:transform .25s,box-shadow .25s,border-color .25s}
.coverage-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-card-hover);border-color:rgba(37,99,235,0.35)}
.coverage-icon{width:48px;height:48px;border-radius:14px;background:var(--brand-light);color:var(--brand);display:flex;align-items:center;justify-content:center;margin-bottom:18px}
.coverage-card h3{font-size:18px;font-weight:700;color:var(--text-main);margin-bottom:8px}
.coverage-card p{font-size:14px;color:var(--text-muted);line-height:1.7}

/* ===== Channel ===== */
.channel-section{padding:48px 0 32px}
.channel-grid{display:grid;grid-template-columns:1fr;gap:40px;align-items:center}
@media(min-width:1024px){.channel-grid{grid-template-columns:1fr 1fr;gap:56px}}
.channel-image{position:relative;border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-card)}
.channel-image img{width:100%;height:auto;object-fit:cover}
.channel-content{max-width:520px}
.channel-list{display:flex;flex-direction:column;gap:24px;margin-top:28px}
.channel-item{display:flex;align-items:flex-start;gap:16px}
.channel-step{flex-shrink:0;width:32px;height:32px;border-radius:50%;background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;margin-top:2px}
.channel-item h3{font-size:16px;font-weight:600;color:var(--text-main);margin-bottom:4px}
.channel-item p{font-size:14px;color:var(--text-muted);line-height:1.65}

/* ===== Quality ===== */
.quality-section{padding:48px 0 32px;background:var(--bg-section)}
.quality-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}
@media(min-width:768px){.quality-grid{grid-template-columns:repeat(4,1fr)}}
.quality-stat{background:var(--bg-main);border:1px solid var(--border);border-radius:var(--radius-lg);padding:28px 20px;text-align:center;box-shadow:var(--shadow-card);transition:transform .25s,box-shadow .25s}
.quality-stat:hover{transform:translateY(-3px);box-shadow:var(--shadow-card-hover)}
.stat-number{font-size:24px;font-weight:800;color:var(--brand);line-height:1.2;margin-bottom:6px;letter-spacing:0.02em}
@media(min-width:768px){.stat-number{font-size:28px}}
.quality-stat p{font-size:13px;color:var(--text-muted);line-height:1.5}

/* ===== Latest ===== */
.latest-section{padding:56px 0 32px}
.latest-list{max-width:860px;margin:0 auto;display:flex;flex-direction:column}
.latest-item{display:flex;flex-direction:column;padding:24px 8px;border-bottom:1px solid var(--bg-subtle);transition:background .2s,padding-left .2s}
@media(min-width:768px){.latest-item{flex-direction:row;gap:28px;padding:28px 12px}}
.latest-item:hover{background:var(--brand-light);border-radius:14px;padding-left:20px}
.latest-meta{flex-shrink:0;width:100%}
@media(min-width:768px){.latest-meta{width:150px}}
.latest-cat{display:inline-block;font-size:12px;font-weight:600;color:var(--brand);background:var(--brand-light);padding:3px 10px;border-radius:999px;margin-bottom:10px}
.latest-date{display:block;font-size:13px;color:var(--text-faint);margin-top:4px}
.latest-body{flex:1}
.latest-body h3{font-size:17px;font-weight:600;color:var(--text-main);margin-bottom:6px;line-height:1.5;transition:color .2s}
.latest-item:hover .latest-body h3{color:var(--brand)}
.latest-body p{font-size:14px;color:var(--text-muted);line-height:1.65;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.latest-link{font-size:14px;font-weight:600;color:var(--brand);display:inline-flex;align-items:center;gap:4px;transition:gap .2s}
.latest-link:hover{gap:8px}

/* ===== FAQ ===== */
.faq-section{padding:48px 0 32px;background:var(--bg-section)}
.faq-list{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:14px}
.faq-item{background:var(--bg-main);border:1px solid var(--border);border-radius:var(--radius-md);overflow:hidden;transition:border-color .25s,box-shadow .25s}
.faq-item:hover{border-color:rgba(37,99,235,0.3)}
.faq-item.active{border-color:var(--brand);box-shadow:0 6px 20px rgba(15,23,42,0.06)}
.faq-question{display:flex;align-items:center;justify-content:space-between;padding:18px 22px;cursor:pointer;font-size:15px;font-weight:600;color:var(--text-main);user-select:none;transition:color .2s}
.faq-question:hover{color:var(--brand)}
.faq-icon{width:28px;height:28px;border-radius:50%;background:var(--bg-subtle);display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:400;color:var(--text-muted);transition:transform .3s,background .3s,color .3s;flex-shrink:0}
.faq-item.active .faq-icon{transform:rotate(45deg);background:var(--brand);color:#fff}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .35s ease;padding:0 22px}
.faq-item.active .faq-answer{max-height:220px;padding:0 22px 20px}
.faq-answer p{font-size:15px;color:var(--text-secondary);line-height:1.75;border-left:3px solid var(--brand);padding-left:14px;margin-top:2px}

/* ===== CTA ===== */
.cta-section{padding:56px 0 64px}
.cta-inner{max-width:760px;margin:0 auto;text-align:center}
.cta-title{font-size:26px;font-weight:700;color:var(--text-main);line-height:1.35;margin-bottom:14px}
@media(min-width:768px){.cta-title{font-size:30px}}
.cta-desc{font-size:16px;color:var(--text-muted);margin-bottom:28px}
.cta-buttons{display:flex;flex-wrap:wrap;justify-content:center;gap:14px}
.btn-primary{display:inline-flex;align-items:center;gap:8px;background:var(--brand);color:#fff;font-size:15px;font-weight:600;padding:12px 28px;border-radius:12px;transition:background .2s,transform .2s,box-shadow .2s}
.btn-primary:hover{background:var(--brand-dark);transform:translateY(-2px);box-shadow:0 10px 24px rgba(37,99,235,0.28)}
.btn-primary:focus-visible{outline:3px solid rgba(37,99,235,0.35);outline-offset:2px}
.btn-secondary{display:inline-flex;align-items:center;gap:8px;background:#fff;color:var(--text-main);border:1px solid var(--border);font-size:15px;font-weight:600;padding:12px 28px;border-radius:12px;transition:border-color .2s,color .2s,transform .2s}
.btn-secondary:hover{border-color:var(--brand);color:var(--brand);transform:translateY(-2px)}
.btn-secondary:focus-visible{outline:3px solid rgba(37,99,235,0.25);outline-offset:2px}
.btn-ghost{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:500;color:var(--text-muted);padding:10px 16px;border-radius:10px;transition:background .2s,color .2s}
.btn-ghost:hover{background:var(--bg-subtle);color:var(--text-main)}

/* ===== Footer ===== */
.site-footer{background:var(--bg-section);border-top:1px solid var(--border)}
.footer-grid{display:grid;grid-template-columns:1fr;gap:32px;padding:48px 0 36px}
@media(min-width:768px){.footer-grid{grid-template-columns:1fr 1fr}}
@media(min-width:1024px){.footer-grid{grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:40px}}
.footer-desc{font-size:14px;color:var(--text-muted);line-height:1.75;margin-top:14px}
.footer-title{font-size:15px;font-weight:700;color:var(--text-main);margin-bottom:14px;position:relative;padding-bottom:10px}
.footer-title::after{content:'';position:absolute;left:0;bottom:0;width:28px;height:2px;background:var(--brand);border-radius:2px}
.footer-links{list-style:none}
.footer-links li{margin-bottom:10px}
.footer-links a{font-size:14px;color:var(--text-muted);transition:color .2s,padding-left .2s}
.footer-links a:hover{color:var(--brand);padding-left:4px}
.footer-contact p{font-size:14px;color:var(--text-muted);line-height:1.7;margin-bottom:6px}
.footer-contact a{color:var(--text-muted);transition:color .2s}
.footer-contact a:hover{color:var(--brand)}
.footer-bottom{border-top:1px solid var(--border);padding:18px 0}
.footer-bottom-inner{display:flex;flex-direction:column;gap:6px;justify-content:space-between;font-size:13px;color:var(--text-faint)}
@media(min-width:768px){.footer-bottom-inner{flex-direction:row}}
.footer-bottom-inner a{color:var(--text-faint);transition:color .2s}
.footer-bottom-inner a:hover{color:var(--brand)}

/* roulang page: category2 */
:root {
            --brand: #2563EB;
            --brand-dark: #1E40AF;
            --brand-light: #F0F5FF;
            --accent: #D97706;
            --bg-white: #FFFFFF;
            --bg-soft: #F8FAFC;
            --line: #E2E8F0;
            --text-main: #0F172A;
            --text-secondary: #334155;
            --text-muted: #64748B;
            --text-faint: #94A3B8;
            --radius-lg: 16px;
            --radius-md: 12px;
            --shadow-sm: 0 8px 30px rgba(15, 23, 42, 0.06);
            --shadow-md: 0 16px 40px rgba(15, 23, 42, 0.10);
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Source Han Sans SC', sans-serif;
            color: var(--text-main);
            background: var(--bg-white);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

        img {
            max-width: 100%;
            display: block;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

        button {
            font-family: inherit;
        }

        .container-page {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        @media (min-width: 768px) {
            .container-page {
                padding-left: 32px;
                padding-right: 32px;
            }
        }

        /* Header */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(255, 255, 255, 0.97);
            border-bottom: 1px solid var(--line);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
            position: relative;
        }

        .nav-left,
        .nav-right {
            display: flex;
            align-items: center;
            gap: 26px;
        }

        .nav-right {
            gap: 22px;
        }

        .logo-wrap {
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            line-height: 1.2;
            text-align: center;
            z-index: 3;
        }

        .logo-main {
            font-size: 22px;
            font-weight: 800;
            color: var(--brand-dark);
            letter-spacing: 1px;
        }

        .logo-sub {
            font-size: 11px;
            font-weight: 500;
            color: var(--text-muted);
            letter-spacing: 4px;
            margin-top: 2px;
        }

        .nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            padding: 8px 2px;
            position: relative;
            transition: color .2s;
        }

        .nav-link:hover {
            color: var(--brand);
        }

        .nav-link.active {
            color: var(--brand);
        }

        .nav-link.active::after {
            content: '';
            position: absolute;
            left: 0;
            right: 0;
            bottom: 0;
            height: 2px;
            background: var(--brand);
            border-radius: 2px;
        }

        .menu-toggle {
            display: none;
            background: none;
            border: 0;
            cursor: pointer;
            width: 42px;
            height: 42px;
            align-items: center;
            justify-content: center;
            border-radius: 8px;
            color: var(--text-secondary);
            transition: background .2s;
        }

        .menu-toggle:hover {
            background: var(--bg-soft);
        }

        .mobile-nav {
            display: none;
            background: #fff;
            border-bottom: 1px solid var(--line);
            padding: 16px 20px 24px;
        }

        .mobile-nav.open {
            display: block;
        }

        .mobile-nav .nav-link {
            display: block;
            padding: 12px 4px;
            border-bottom: 1px solid #f1f5f9;
        }

        .mobile-nav .nav-link:last-of-type {
            border-bottom: 0;
        }

        .mobile-menu-cta {
            margin-top: 14px;
            display: flex;
            gap: 12px;
        }

        @media (max-width: 1024px) {
            .nav-left,
            .nav-right {
                display: none;
            }

            .menu-toggle {
                display: flex;
            }

            .header-inner {
                height: 64px;
            }

            .logo-wrap {
                position: static;
                transform: none;
                margin: 0 auto;
            }

            .mobile-nav {
                top: 64px;
            }
        }

        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-size: 15px;
            font-weight: 600;
            padding: 12px 24px;
            border-radius: var(--radius-md);
            border: 1px solid transparent;
            cursor: pointer;
            transition: all .2s ease;
            white-space: nowrap;
        }

        .btn:focus-visible {
            outline: 3px solid rgba(37, 99, 235, 0.35);
            outline-offset: 2px;
        }

        .btn-primary {
            background: var(--brand);
            color: #fff;
        }

        .btn-primary:hover {
            background: var(--brand-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.22);
        }

        .btn-outline {
            background: #fff;
            border-color: var(--line);
            color: var(--text-secondary);
        }

        .btn-outline:hover {
            border-color: var(--brand);
            color: var(--brand);
        }

        .btn-large {
            padding: 16px 30px;
            border-radius: var(--radius-lg);
            font-size: 16px;
        }

        .btn-block {
            width: 100%;
        }

        .btn-icon svg {
            width: 20px;
            height: 20px;
        }

        .btn-link-download {
            font-size: 15px;
            font-weight: 600;
            color: var(--brand);
            padding: 12px 16px;
            border-radius: var(--radius-md);
            transition: background .2s, color .2s;
        }

        .btn-link-download:hover {
            background: var(--brand-light);
            color: var(--brand-dark);
        }

        /* Page Hero */
        .page-hero {
            background-color: var(--brand-light);
            background-image: linear-gradient(rgba(37, 99, 235, 0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(37, 99, 235, 0.05) 1px, transparent 1px);
            background-size: 36px 36px;
            padding: 88px 0 72px;
            border-bottom: 1px solid var(--line);
            position: relative;
            overflow: hidden;
        }

        .hero-breadcrumb {
            display: flex;
            justify-content: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 20px;
        }

        .hero-breadcrumb a {
            color: var(--text-muted);
            transition: color .2s;
        }

        .hero-breadcrumb a:hover {
            color: var(--brand);
        }

        .hero-tag {
            display: inline-block;
            background: #fff;
            border: 1px solid var(--line);
            padding: 6px 16px;
            border-radius: 999px;
            font-size: 13px;
            font-weight: 600;
            color: var(--brand);
            margin-bottom: 20px;
            box-shadow: var(--shadow-sm);
        }

        .hero-title {
            font-size: 40px;
            font-weight: 800;
            color: var(--text-main);
            letter-spacing: 2px;
            line-height: 1.2;
        }

        .hero-subtitle {
            max-width: 720px;
            margin: 20px auto 32px;
            font-size: 16px;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        .hero-actions {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        .hero-stats-row {
            max-width: 920px;
            margin: 48px auto 0;
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
        }

        .hero-stat-card {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            padding: 20px 24px;
            box-shadow: var(--shadow-sm);
            text-align: center;
            transition: transform .25s, box-shadow .25s;
        }

        .hero-stat-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
        }

        .stat-value {
            display: block;
            font-size: 20px;
            font-weight: 700;
            color: var(--brand-dark);
            letter-spacing: 1px;
        }

        .stat-label {
            display: block;
            font-size: 13px;
            color: var(--text-muted);
            margin-top: 4px;
        }

        @media (max-width: 640px) {
            .hero-stats-row {
                grid-template-columns: 1fr;
            }

            .hero-title {
                font-size: 32px;
            }
        }

        /* Page Anchor Nav */
        .page-nav-sticky {
            position: sticky;
            top: 72px;
            z-index: 20;
            background: #fff;
            border-bottom: 1px solid var(--line);
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
        }

        .page-nav-sticky .container-page {
            display: flex;
            gap: 8px;
            padding-top: 12px;
            padding-bottom: 12px;
        }

        .page-nav-sticky a {
            display: inline-block;
            flex-shrink: 0;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-muted);
            padding: 8px 16px;
            border-radius: 999px;
            border: 1px solid transparent;
            transition: all .2s;
        }

        .page-nav-sticky a:hover {
            color: var(--brand);
            background: var(--brand-light);
            border-color: rgba(37, 99, 235, 0.1);
        }

        @media (max-width: 1024px) {
            .page-nav-sticky {
                top: 64px;
            }
        }

        /* Sections */
        .section-block {
            padding: 80px 0;
        }

        .section-block.bg-soft {
            background: var(--bg-soft);
        }

        .section-head {
            max-width: 760px;
            margin-bottom: 40px;
        }

        .section-head.center {
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }

        .section-tag {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            color: var(--brand);
            background: var(--brand-light);
            padding: 6px 14px;
            border-radius: 999px;
            margin-bottom: 14px;
        }

        .section-head h2 {
            font-size: 30px;
            font-weight: 700;
            color: var(--text-main);
            line-height: 1.3;
            margin-bottom: 14px;
        }

        .section-head p {
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.8;
        }

        /* Card */
        .card {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            padding: 28px;
            transition: transform .25s, box-shadow .25s;
        }

        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }

        /* Coverage */
        .coverage-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
            margin-bottom: 48px;
        }

        .coverage-info p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 20px;
        }

        .check-list {
            list-style: none;
            display: grid;
            gap: 12px;
            margin-top: 10px;
        }

        .check-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 15px;
            color: var(--text-secondary);
        }

        .check-list svg {
            width: 20px;
            height: 20px;
            flex-shrink: 0;
            color: var(--brand);
            margin-top: 3px;
        }

        .coverage-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--line);
            box-shadow: var(--shadow-md);
        }

        .coverage-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .card-grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .card-icon {
            width: 46px;
            height: 46px;
            border-radius: 12px;
            background: var(--brand-light);
            color: var(--brand);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 18px;
        }

        .card-icon svg {
            width: 24px;
            height: 24px;
        }

        .card h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-main);
        }

        .card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* Metrics */
        .metric-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .metric-card {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            box-shadow: var(--shadow-sm);
            transition: transform .25s, box-shadow .25s;
        }

        .metric-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }

        .metric-card .metric-num {
            font-size: 28px;
            font-weight: 800;
            color: var(--brand);
            letter-spacing: 1px;
            margin-bottom: 12px;
        }

        .metric-card h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 8px;
        }

        .metric-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        .quote-note {
            margin-top: 40px;
            background: var(--brand-light);
            border-left: 4px solid var(--brand);
            padding: 20px 28px;
            border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        /* Trend */
        .trend-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 56px;
            align-items: center;
        }

        .trend-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--line);
            box-shadow: var(--shadow-md);
        }

        .trend-image img {
            width: 100%;
            object-fit: cover;
        }

        .trend-content h2 {
            font-size: 30px;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--text-main);
        }

        .trend-content p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 18px;
        }

        .trend-content .check-list {
            margin-top: 8px;
        }

        /* Scenario */
        .scenario-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .scenario-icon {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--brand-light);
            color: var(--brand);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 18px;
        }

        .scenario-icon svg {
            width: 22px;
            height: 22px;
        }

        /* Flow */
        .flow-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: flow-step;
        }

        .flow-step {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            position: relative;
            transition: transform .25s, box-shadow .25s;
        }

        .flow-step:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }

        .flow-step .step-num {
            width: 40px;
            height: 40px;
            border-radius: 10px;
            background: var(--brand);
            color: #fff;
            font-size: 18px;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 18px;
        }

        .flow-step h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-main);
        }

        .flow-step p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* FAQ */
        .faq-list {
            max-width: 860px;
            margin: 0 auto;
            display: grid;
            gap: 16px;
        }

        .faq-item {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: border-color .25s, box-shadow .25s;
        }

        .faq-item.open {
            border-color: rgba(37, 99, 235, 0.4);
            box-shadow: var(--shadow-sm);
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            background: #fff;
            border: 0;
            padding: 22px 28px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-main);
            text-align: left;
            transition: background .2s;
        }

        .faq-question:hover {
            background: var(--bg-soft);
        }

        .faq-icon {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--brand-light);
            color: var(--brand);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            transition: transform .3s ease;
        }

        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .35s ease;
        }

        .faq-answer-inner {
            padding: 0 28px 24px;
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        /* CTA */
        .cta-section {
            background: var(--bg-soft);
            border-top: 1px solid var(--line);
            text-align: center;
        }

        .cta-section h2 {
            font-size: 30px;
            font-weight: 700;
            margin-bottom: 14px;
            color: var(--text-main);
        }

        .cta-section .cta-desc {
            max-width: 640px;
            margin: 0 auto 32px;
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.8;
        }

        .download-flex {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* Footer */
        .site-footer {
            background: #fff;
            border-top: 1px solid var(--line);
            padding: 64px 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
            gap: 40px;
            padding-bottom: 40px;
        }

        .footer-brand .logo-wrap {
            position: static;
            transform: none;
            margin-bottom: 16px;
            align-items: flex-start;
        }

        .footer-brand .logo-main {
            font-size: 20px;
        }

        .footer-brand .logo-sub {
            font-size: 11px;
        }

        .footer-desc {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.8;
            max-width: 300px;
        }

        .footer-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 16px;
        }

        .footer-links {
            list-style: none;
            display: grid;
            gap: 10px;
        }

        .footer-links a {
            font-size: 14px;
            color: var(--text-muted);
            transition: color .2s;
        }

        .footer-links a:hover {
            color: var(--brand);
        }

        .footer-contact p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 2;
        }

        .footer-contact a {
            color: var(--brand);
        }

        .footer-bottom {
            border-top: 1px solid var(--line);
            padding: 20px 0;
        }

        .footer-bottom-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            font-size: 13px;
            color: var(--text-faint);
        }

        .footer-bottom-inner a {
            color: var(--text-muted);
            transition: color .2s;
        }

        .footer-bottom-inner a:hover {
            color: var(--brand);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .section-block {
                padding: 64px 0;
            }

            .coverage-grid,
            .trend-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .metric-grid,
            .scenario-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .flow-steps {
                grid-template-columns: repeat(2, 1fr);
            }

            .card-grid-3 {
                grid-template-columns: 1fr;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }

        @media (max-width: 640px) {
            .section-block {
                padding: 56px 0;
            }

            .section-head h2 {
                font-size: 26px;
            }

            .metric-grid,
            .scenario-grid,
            .flow-steps {
                grid-template-columns: 1fr;
            }

            .hero-actions {
                flex-direction: column;
                align-items: stretch;
                padding: 0 20px;
            }

            .hero-actions .btn {
                width: 100%;
            }

            .page-nav-sticky .container-page {
                display: flex;
                flex-wrap: nowrap;
                overflow-x: auto;
            }

            .footer-grid {
                grid-template-columns: 1fr;
            }

            .footer-bottom-inner {
                flex-direction: column;
                text-align: center;
            }

            .download-flex {
                flex-direction: column;
                align-items: stretch;
            }

            .download-flex .btn {
                width: 100%;
            }

            .download-flex .btn-link-download {
                text-align: center;
            }
        }

        @media (max-width: 520px) {
            .container-page {
                padding-left: 16px;
                padding-right: 16px;
            }

            .hero-subtitle {
                padding: 0 8px;
            }

            .page-hero {
                padding-top: 64px;
                padding-bottom: 56px;
            }
        }

/* roulang page: category4 */
:root {
            --brand-primary: #2563EB;
            --brand-dark: #1E40AF;
            --brand-light: #F0F5FF;
            --accent-amber: #D97706;
            --bg-white: #FFFFFF;
            --bg-section: #F8FAFC;
            --text-main: #0F172A;
            --text-secondary: #334155;
            --text-muted: #64748B;
            --text-light: #94A3B8;
            --border-line: #E2E8F0;
            --radius-card: 16px;
            --radius-btn: 12px;
            --shadow-card: 0 8px 30px rgba(15, 23, 42, 0.06);
            --shadow-hover: 0 16px 40px rgba(15, 23, 42, 0.10);
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Source Han Sans SC', sans-serif;
            color: var(--text-main);
            background: var(--bg-white);
            line-height: 1.7;
            font-size: 15px;
        }
        img {
            max-width: 100%;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: all .3s ease;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
            font-family: inherit;
        }
        input:focus-visible,
        button:focus-visible,
        a:focus-visible {
            outline: 2px solid var(--brand-primary);
            outline-offset: 2px;
            border-radius: 4px;
        }
        .container-page {
            max-width: 1280px;
            margin: 0 auto;
            padding-left: 16px;
            padding-right: 16px;
        }
        @media (min-width: 1024px) {
            .container-page {
                padding-left: 32px;
                padding-right: 32px;
            }
        }

        /* ===== Header & Nav ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.98);
            border-bottom: 1px solid var(--border-line);
            backdrop-filter: blur(4px);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 76px;
            gap: 16px;
        }
        .logo-wrap {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            text-align: center;
            line-height: 1.2;
        }
        .logo-main {
            font-size: 22px;
            font-weight: 800;
            color: var(--text-main);
            letter-spacing: 0.01em;
        }
        .logo-sub {
            font-size: 11px;
            color: var(--text-muted);
            letter-spacing: 0.2em;
            font-weight: 500;
            margin-top: 2px;
        }
        .nav-left,
        .nav-right {
            display: none;
            align-items: center;
            gap: 28px;
        }
        .nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            padding: 6px 2px;
            position: relative;
            white-space: nowrap;
        }
        .nav-link:hover {
            color: var(--brand-primary);
        }
        .nav-link.active {
            color: var(--brand-primary);
            font-weight: 600;
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 2px;
            background: var(--brand-primary);
            border-radius: 2px;
        }
        .nav-cta {
            display: none;
            background: var(--brand-primary);
            color: #fff;
            padding: 10px 22px;
            border-radius: var(--radius-btn);
            font-size: 14px;
            font-weight: 600;
            white-space: nowrap;
            transition: all .3s ease;
        }
        .nav-cta:hover {
            background: var(--brand-dark);
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(37, 99, 235, 0.25);
        }
        @media (min-width: 1024px) {
            .nav-left,
            .nav-right {
                display: flex;
            }
            .nav-cta {
                display: inline-block;
            }
            .header-inner {
                display: grid;
                grid-template-columns: 1fr auto 1fr;
            }
            .nav-left {
                justify-content: flex-start;
            }
            .nav-right {
                justify-content: flex-end;
            }
        }
        .menu-toggle {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 42px;
            height: 42px;
            border-radius: 10px;
            border: 1px solid var(--border-line);
            background: #fff;
        }
        @media (min-width: 1024px) {
            .menu-toggle {
                display: none;
            }
        }
        .mobile-menu {
            display: none;
            background: #fff;
            border-top: 1px solid var(--border-line);
            padding: 16px 20px 24px;
            position: absolute;
            top: 76px;
            left: 0;
            right: 0;
            box-shadow: 0 20px 40px rgba(15, 23, 42, 0.08);
            z-index: 99;
        }
        .mobile-menu.open {
            display: block;
        }
        .mobile-menu a {
            display: block;
            padding: 14px 8px;
            font-size: 16px;
            font-weight: 500;
            color: var(--text-main);
            border-bottom: 1px solid #f1f5f9;
        }
        .mobile-menu a:hover {
            color: var(--brand-primary);
            padding-left: 16px;
        }
        .mobile-menu a.active {
            color: var(--brand-primary);
            font-weight: 600;
        }
        .mobile-menu .mobile-cta {
            margin-top: 18px;
            background: var(--brand-primary);
            color: #fff;
            text-align: center;
            padding: 14px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            border-bottom: none;
        }
        .mobile-menu .mobile-cta:hover {
            background: var(--brand-dark);
            color: #fff;
            padding-left: 14px;
        }

        /* ===== Hero ===== */
        .category-hero {
            background: linear-gradient(135deg, #F0F5FF 0%, #ffffff 100%);
            padding: 80px 0 64px;
            position: relative;
            overflow: hidden;
        }
        .category-hero::before {
            content: '';
            position: absolute;
            top: -80px;
            right: -120px;
            width: 360px;
            height: 360px;
            background: radial-gradient(circle, rgba(37, 99, 235, 0.08) 0%, transparent 70%);
            border-radius: 50%;
        }
        .category-hero .hero-inner {
            display: grid;
            grid-template-columns: 1fr;
            gap: 40px;
            align-items: center;
            position: relative;
            z-index: 2;
        }
        @media (min-width: 1024px) {
            .category-hero .hero-inner {
                grid-template-columns: 1.1fr 0.9fr;
            }
        }
        .category-hero h1 {
            font-size: 36px;
            line-height: 1.2;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 18px;
            letter-spacing: -0.01em;
        }
        @media (min-width: 768px) {
            .category-hero h1 {
                font-size: 44px;
            }
        }
        .category-hero .hero-desc {
            font-size: 16px;
            line-height: 1.8;
            color: var(--text-secondary);
            margin-bottom: 28px;
            max-width: 520px;
        }
        .hero-meta {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            margin-top: 24px;
        }
        .hero-meta-item {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-muted);
            background: rgba(255, 255, 255, 0.7);
            border: 1px solid var(--border-line);
            border-radius: 999px;
            padding: 8px 16px;
        }
        .hero-meta-item svg {
            width: 16px;
            height: 16px;
            color: var(--brand-primary);
        }
        .hero-image {
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-hover);
            overflow: hidden;
            border: 1px solid var(--border-line);
        }
        .hero-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb-wrap {
            padding: 20px 0 0;
            background: #fff;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-muted);
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--text-muted);
        }
        .breadcrumb a:hover {
            color: var(--brand-primary);
        }
        .breadcrumb .separator {
            color: var(--border-line);
        }
        .breadcrumb .current {
            color: var(--text-main);
            font-weight: 500;
        }

        /* ===== Anchor Nav ===== */
        .anchor-nav-wrap {
            background: var(--bg-white);
            padding: 32px 0 8px;
        }
        .anchor-nav {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: center;
        }
        .anchor-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 20px;
            border-radius: 999px;
            border: 1px solid var(--border-line);
            background: #fff;
            color: var(--text-secondary);
            font-size: 14px;
            font-weight: 500;
            transition: all .3s ease;
        }
        .anchor-link:hover {
            border-color: var(--brand-primary);
            color: var(--brand-primary);
            background: var(--brand-light);
        }
        .anchor-link svg {
            width: 16px;
            height: 16px;
            color: var(--brand-primary);
        }

        /* ===== Section Base ===== */
        .section-block {
            padding: 60px 0;
        }
        @media (min-width: 768px) {
            .section-block {
                padding: 80px 0;
            }
        }
        .section-head {
            text-align: center;
            max-width: 640px;
            margin: 0 auto 48px;
        }
        .section-head h2 {
            font-size: 30px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 12px;
            letter-spacing: -0.01em;
        }
        .section-head p {
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.7;
        }
        .section-label {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            color: var(--brand-primary);
            background: var(--brand-light);
            padding: 4px 14px;
            border-radius: 999px;
            margin-bottom: 14px;
            letter-spacing: 0.04em;
        }

        /* ===== Content Alternating ===== */
        .alt-block {
            display: grid;
            grid-template-columns: 1fr;
            gap: 36px;
            align-items: center;
            margin-bottom: 60px;
        }
        @media (min-width: 768px) {
            .alt-block {
                grid-template-columns: 1fr 1fr;
                gap: 48px;
            }
        }
        .alt-block.reverse .alt-media {
            order: 2;
        }
        @media (min-width: 768px) {
            .alt-block.reverse .alt-media {
                order: 1;
            }
            .alt-block.reverse .alt-content {
                order: 2;
            }
        }
        .alt-media {
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-line);
        }
        .alt-media img {
            width: 100%;
            height: auto;
            object-fit: cover;
        }
        .alt-content h3 {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 16px;
            line-height: 1.3;
        }
        .alt-content p {
            color: var(--text-secondary);
            line-height: 1.75;
            margin-bottom: 14px;
            font-size: 15px;
        }
        .alt-content .feature-list {
            margin-top: 16px;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .alt-content .feature-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            color: var(--text-secondary);
            font-size: 15px;
        }
        .alt-content .feature-list li svg {
            width: 18px;
            height: 18px;
            color: var(--brand-primary);
            flex-shrink: 0;
            margin-top: 4px;
        }
        .alt-content ul {
            list-style: none;
        }

        /* ===== Cards Grid ===== */
        .grid-3 {
            display: grid;
            grid-template-columns: 1fr;
            gap: 24px;
        }
        @media (min-width: 640px) {
            .grid-3 {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (min-width: 1024px) {
            .grid-3 {
                grid-template-columns: repeat(3, 1fr);
            }
        }
        .help-card {
            background: #fff;
            border: 1px solid var(--border-line);
            border-radius: var(--radius-card);
            padding: 28px;
            box-shadow: var(--shadow-card);
            transition: all .3s ease;
        }
        .help-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
            border-color: var(--brand-primary);
        }
        .help-card .card-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: var(--brand-light);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 16px;
        }
        .help-card .card-icon svg {
            width: 22px;
            height: 22px;
            color: var(--brand-primary);
        }
        .help-card h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 10px;
        }
        .help-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* ===== FAQ Accordion ===== */
        .faq-wrap {
            max-width: 760px;
            margin: 0 auto;
        }
        .faq-item {
            border: 1px solid var(--border-line);
            border-radius: var(--radius-card);
            margin-bottom: 12px;
            background: #fff;
            overflow: hidden;
            transition: box-shadow .3s ease;
        }
        .faq-item:hover {
            box-shadow: var(--shadow-card);
        }
        .faq-item.active {
            border-color: var(--brand-primary);
            box-shadow: var(--shadow-card);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 24px;
            font-size: 16px;
            font-weight: 500;
            color: var(--text-main);
            cursor: pointer;
            width: 100%;
            text-align: left;
            background: none;
            border: none;
        }
        .faq-question .faq-icon {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--brand-light);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            margin-left: 16px;
            transition: transform .3s ease;
        }
        .faq-question .faq-icon svg {
            width: 14px;
            height: 14px;
            color: var(--brand-primary);
        }
        .faq-item.active .faq-icon {
            transform: rotate(45deg);
            background: var(--brand-primary);
        }
        .faq-item.active .faq-icon svg {
            color: #fff;
        }
        .faq-answer {
            display: none;
            padding: 0 24px 22px;
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.75;
        }
        .faq-item.active .faq-answer {
            display: block;
        }

        /* ===== Contact CTA ===== */
        .cta-block {
            background: var(--brand-light);
            border-radius: 20px;
            padding: 48px 32px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        @media (min-width: 768px) {
            .cta-block {
                padding: 64px 48px;
            }
        }
        .cta-block h2 {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-main);
        }
        .cta-block p {
            color: var(--text-secondary);
            margin-bottom: 28px;
            font-size: 15px;
            max-width: 480px;
            margin-left: auto;
            margin-right: auto;
        }
        .cta-buttons {
            display: flex;
            gap: 14px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--brand-primary);
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            padding: 14px 28px;
            border-radius: var(--radius-btn);
            transition: all .3s ease;
            border: none;
        }
        .btn-primary:hover {
            background: var(--brand-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.3);
            color: #fff;
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: #fff;
            color: var(--text-main);
            font-size: 15px;
            font-weight: 500;
            padding: 14px 28px;
            border-radius: var(--radius-btn);
            border: 1px solid var(--border-line);
            transition: all .3s ease;
        }
        .btn-secondary:hover {
            border-color: var(--brand-primary);
            color: var(--brand-primary);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(15, 23, 42, 0.06);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--text-main);
            color: #CBD5E1;
            padding: 64px 0 0;
            margin-top: 40px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 36px;
            padding-bottom: 48px;
        }
        @media (min-width: 768px) {
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (min-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
            }
        }
        .footer-brand .logo-wrap {
            align-items: flex-start;
            text-align: left;
        }
        .footer-brand .logo-main {
            color: #fff;
            font-size: 22px;
            font-weight: 800;
        }
        .footer-brand .logo-sub {
            color: var(--text-light);
            font-size: 11px;
            letter-spacing: 0.14em;
        }
        .footer-desc {
            font-size: 14px;
            line-height: 1.7;
            color: #94A3B8;
            margin-top: 16px;
            max-width: 320px;
        }
        .footer-title {
            font-size: 16px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 18px;
        }
        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .footer-links a {
            font-size: 14px;
            color: #94A3B8;
            transition: all .3s ease;
        }
        .footer-links a:hover {
            color: #fff;
            padding-left: 6px;
        }
        .footer-contact p {
            font-size: 14px;
            color: #94A3B8;
            margin-bottom: 8px;
            line-height: 1.6;
        }
        .footer-contact a {
            color: #94A3B8;
            border-bottom: 1px solid transparent;
        }
        .footer-contact a:hover {
            color: #fff;
            border-bottom-color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(148, 163, 184, 0.15);
            padding: 20px 0;
        }
        .footer-bottom-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: #64748B;
        }
        .footer-bottom-inner a {
            color: #64748B;
        }
        .footer-bottom-inner a:hover {
            color: #fff;
        }

        /* ===== Scroll Reveal ===== */
        .reveal {
            opacity: 0;
            transform: translateY(20px);
            transition: opacity .6s ease, transform .6s ease;
        }
        .reveal.visible {
            opacity: 1;
            transform: translateY(0);
        }