/* roulang page: index */
:root {
  --c-dark: #0B0F14;
  --c-card-dark: #131A22;
  --c-accent: #C9FF3A;
  --c-light-bg: #F4F5F7;
  --c-card-light: #FFFFFF;
  --c-text-dark-body: #D1D5DB;
  --c-text-dark-muted: #9CA3AF;
  --c-text-light-body: #374151;
  --c-text-light-muted: #9CA3AF;
  --c-border-dark: rgba(255,255,255,0.08);
  --c-border-light: rgba(0,0,0,0.08);
  --radius-card: 16px;
  --radius-btn: 9999px;
  --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
  --shadow-card-hover: 0 12px 32px rgba(0,0,0,0.12);
  --container: 80rem;
  --font-body: 'Noto Sans SC', system-ui, sans-serif;
  --font-num: 'Space Grotesk', 'Inter', monospace;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body { font-family: var(--font-body); background: var(--c-dark); color: var(--c-text-dark-body); line-height: 1.6; overflow-x: hidden; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
.tnum { font-family: var(--font-num); font-variant-numeric: tabular-nums; font-feature-settings: "tnum"; }
.container { max-width: var(--container); margin: 0 auto; padding-left: 24px; padding-right: 24px; }
.section { padding: 96px 0; }
.section-title { font-size: 40px; font-weight: 700; line-height: 1.2; letter-spacing: -0.01em; }
.section-sub { font-size: 16px; color: var(--c-text-light-muted); margin-top: 12px; }
.btn { display: inline-flex; align-items: center; justify-content: center; font-weight: 700; font-size: 16px; padding: 14px 32px; border-radius: var(--radius-btn); transition: all 0.25s ease; border: none; line-height: 1.4; white-space: nowrap; }
.btn-primary { background: var(--c-accent); color: #0B0F14; }
.btn-primary:hover { background: #FFFFFF; transform: scale(1.02); }
.btn-secondary { background: transparent; color: #FFFFFF; border: 1.5px solid rgba(255,255,255,0.7); }
.btn-secondary:hover { background: rgba(255,255,255,0.1); transform: scale(1.02); }
.header { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; transition: all 0.3s ease; background: transparent; }
.header.scrolled { background: rgba(11, 15, 20, 0.82); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); border-bottom: 1px solid rgba(255,255,255,0.08); }
.header-inner { display: flex; align-items: center; justify-content: space-between; max-width: var(--container); margin: 0 auto; padding: 18px 24px; }
.header-left, .header-right { display: flex; align-items: center; gap: 8px; flex: 1; }
.header-right { justify-content: flex-end; }
.header-center { position: absolute; left: 50%; transform: translateX(-50%); }
.logo { font-size: 24px; font-weight: 900; letter-spacing: 0.02em; color: #FFFFFF; display: flex; align-items: center; gap: 2px; }
.logo-accent { color: var(--c-accent); }
.nav-link { font-size: 15px; font-weight: 500; color: rgba(255,255,255,0.8); padding: 6px 16px; border-radius: 999px; position: relative; transition: color 0.2s ease; }
.nav-link:hover { color: #FFFFFF; }
.nav-link.active { color: var(--c-accent); }
.nav-link.active::after { content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%); width: 24px; height: 2px; background: var(--c-accent); border-radius: 2px; }
.menu-toggle { display: none; background: none; border: none; color: #fff; font-size: 24px; padding: 8px; cursor: pointer; margin-left: auto; line-height: 1; }
.mobile-menu { display: none; position: fixed; inset: 0; background: rgba(11,15,20,0.97); z-index: 999; padding: 80px 32px 32px; flex-direction: column; gap: 8px; }
.mobile-menu.open { display: flex; }
.mobile-menu .nav-link { font-size: 20px; padding: 14px 0; border-bottom: 1px solid rgba(255,255,255,0.06); color: rgba(255,255,255,0.85); border-radius: 0; }
.mobile-menu .nav-link.active { color: var(--c-accent); }
.mobile-menu .nav-link.active::after { display: none; }
.mobile-close { position: absolute; top: 20px; right: 24px; background: none; border: none; color: #fff; font-size: 28px; cursor: pointer; z-index: 1001; }
.hero { min-height: 100vh; display: flex; align-items: center; position: relative; background: url('/assets/images/backpic/back-1.webp') center center / cover no-repeat; }
.hero::before { content: ''; position: absolute; inset: 0; background: rgba(11,15,20,0.6); }
.hero-content { position: relative; z-index: 2; width: 100%; }
.hero-title { font-size: 64px; font-weight: 900; line-height: 1.1; color: #FFFFFF; letter-spacing: -0.02em; }
.hero-sub { font-size: 18px; color: rgba(255,255,255,0.75); margin-top: 20px; max-width: 560px; line-height: 1.8; }
.hero-actions { display: flex; gap: 16px; margin-top: 40px; flex-wrap: wrap; }
.scroll-indicator { position: absolute; bottom: 36px; left: 50%; transform: translateX(-50%); display: flex; flex-direction: column; align-items: center; gap: 8px; color: rgba(255,255,255,0.5); font-size: 12px; animation: bounceDown 2s infinite; z-index: 2; }
.scroll-line { width: 1px; height: 40px; background: rgba(255,255,255,0.4); position: relative; overflow: hidden; }
.scroll-line::after { content: ''; position: absolute; top: -100%; left: 0; width: 100%; height: 100%; background: var(--c-accent); animation: scrollFlowing 2s ease-in-out infinite; }
@keyframes bounceDown { 0%,100% { transform: translate(-50%, 0); } 50% { transform: translate(-50%, 10px); } }
@keyframes scrollFlowing { 0% { top: -100%; } 100% { top: 100%; } }
.steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; margin-top: 56px; }
.step-item { padding: 32px 24px; position: relative; }
.step-item:not(:last-child)::after { content: ''; position: absolute; right: 0; top: 24px; bottom: 24px; width: 1px; background: rgba(255,255,255,0.08); }
.step-num { font-family: var(--font-num); font-size: 80px; font-weight: 700; color: var(--c-accent); line-height: 1; }
.step-title { font-size: 20px; font-weight: 600; color: #FFFFFF; margin-top: 16px; }
.step-desc { font-size: 14px; color: var(--c-text-dark-muted); line-height: 1.8; margin-top: 10px; }
.badges-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-top: 56px; }
.badge-card { background: var(--c-card-light); border-radius: var(--radius-card); padding: 32px 24px; text-align: center; transition: all 0.3s ease; box-shadow: var(--shadow-card); }
.badge-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-card-hover); }
.badge-icon { width: 48px; height: 48px; border-radius: 50%; border: 1px solid rgba(0,0,0,0.12); display: flex; align-items: center; justify-content: center; margin: 0 auto 16px; font-size: 22px; transition: border-color 0.3s ease; }
.badge-card:hover .badge-icon { border-color: var(--c-accent); }
.badge-name { font-size: 16px; font-weight: 600; color: #111827; }
.badge-cond { font-size: 13px; color: var(--c-text-light-muted); margin-top: 6px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.stats-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.stat-num { font-family: var(--font-num); font-size: 100px; font-weight: 700; color: var(--c-accent); line-height: 1; display: block; }
.stat-label { font-size: 16px; color: var(--c-text-dark-muted); margin-top: 8px; }
.progress-track { background: rgba(255,255,255,0.1); height: 8px; border-radius: 999px; overflow: hidden; }
.progress-fill { background: var(--c-accent); height: 100%; border-radius: 999px; transition: width 1.2s ease-out; }
.progress-meta { display: flex; justify-content: space-between; margin-top: 12px; font-size: 14px; color: var(--c-text-dark-muted); }
.cta-block { position: relative; background: url('/assets/images/backpic/back-2.webp') center center / cover no-repeat; }
.cta-block::before { content: ''; position: absolute; inset: 0; background: rgba(11,15,20,0.75); }
.cta-inner { position: relative; z-index: 2; text-align: center; }
.cta-title { font-size: 28px; font-weight: 700; color: #FFFFFF; }
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 48px; }
.news-card { background: var(--c-card-light); border-radius: var(--radius-card); overflow: hidden; transition: all 0.3s ease; box-shadow: var(--shadow-card); display: block; }
.news-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-card-hover); }
.news-cover { aspect-ratio: 16/9; overflow: hidden; }
.news-cover img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.news-card:hover .news-cover img { transform: scale(1.02); }
.news-body { padding: 20px; }
.news-tag { display: inline-block; font-size: 12px; font-weight: 500; color: var(--c-accent); background: rgba(201,255,58,0.08); padding: 4px 12px; border-radius: 999px; margin-bottom: 12px; }
.news-title { font-size: 18px; font-weight: 600; color: #111827; line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; min-height: 54px; }
.news-excerpt { font-size: 14px; color: var(--c-text-light-muted); line-height: 1.7; margin-top: 8px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-meta { display: flex; align-items: center; justify-content: space-between; margin-top: 16px; font-size: 13px; color: #9CA3AF; }
.empty-state { grid-column: 1 / -1; background: rgba(255,255,255,0.7); border-radius: var(--radius-card); padding: 48px 24px; text-align: center; color: var(--c-text-light-muted); font-size: 15px; }
.faq-list { margin-top: 48px; max-width: 720px; margin-left: auto; margin-right: auto; }
.faq-item { border-bottom: 1px solid rgba(0,0,0,0.08); }
.faq-q { display: flex; justify-content: space-between; align-items: center; padding: 20px 0; font-size: 16px; font-weight: 600; color: #1F2937; cursor: pointer; transition: color 0.2s ease; background: none; border: none; width: 100%; text-align: left; }
.faq-q:hover { color: #111827; }
.faq-icon { font-size: 22px; transition: transform 0.3s ease; color: #9CA3AF; flex-shrink: 0; margin-left: 16px; }
.faq-item.active .faq-icon { transform: rotate(45deg); color: var(--c-accent); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.35s ease, padding 0.35s ease; padding: 0; font-size: 14px; color: var(--c-text-light-muted); line-height: 1.8; }
.faq-item.active .faq-a { max-height: 300px; padding: 0 0 20px; }
.footer { background: var(--c-dark); border-top: 1px solid rgba(255,255,255,0.08); padding: 64px 0 32px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; }
.footer-logo { font-size: 24px; font-weight: 900; color: #FFFFFF; }
.footer-desc { font-size: 14px; color: var(--c-text-dark-muted); margin-top: 12px; line-height: 1.8; }
.footer-col-title { font-size: 15px; font-weight: 600; color: #FFFFFF; margin-bottom: 16px; }
.footer-links { list-style: none; }
.footer-links li { margin-bottom: 10px; }
.footer-links a { font-size: 14px; color: var(--c-text-dark-muted); transition: color 0.2s ease; }
.footer-links a:hover { color: var(--c-accent); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.06); margin-top: 48px; padding-top: 24px; text-align: center; font-size: 13px; color: var(--c-text-dark-muted); }
.reveal { opacity: 0; transform: translateY(8px); transition: opacity 0.4s ease, transform 0.4s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
@media (max-width: 1024px) {
  .nav-link { font-size: 14px; padding: 6px 10px; }
  .stat-num { font-size: 80px; }
}
@media (max-width: 860px) {
  .header-left .nav-link, .header-right .nav-link { display: none; }
  .menu-toggle { display: block; }
  .section { padding: 64px 0; }
  .section-title { font-size: 28px; }
  .hero-title { font-size: 36px; }
  .steps-grid { grid-template-columns: 1fr; gap: 0; }
  .step-item:not(:last-child)::after { display: none; }
  .step-item { padding: 24px 0; border-bottom: 1px solid rgba(255,255,255,0.06); }
  .step-num { font-size: 60px; }
  .badges-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .stats-layout { grid-template-columns: 1fr; gap: 40px; }
  .stat-num { font-size: 56px; }
  .news-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 520px) {
  .container { padding-left: 16px; padding-right: 16px; }
  .header-inner { padding: 14px 16px; }
  .badges-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .badge-card { padding: 24px 12px; }
  .hero-actions .btn { width: 100%; }
  .footer-grid { grid-template-columns: 1fr; }
}

/* roulang page: category1 */
:root {
            --bg-dark: #0B0F14;
            --bg-card: #131A22;
            --bg-light: #F4F5F7;
            --accent: #C9FF3A;
            --text-dark-bg: #D1D5DB;
            --text-light-bg: #374151;
            --text-muted: #9CA3AF;
            --border-white: rgba(255, 255, 255, 0.08);
            --border-black: rgba(0, 0, 0, 0.08);
            --radius-card: 16px;
            --radius-btn: 999px;
            --font-cn: 'Noto Sans SC', system-ui, sans-serif;
            --font-num: 'Space Grotesk', 'Inter', monospace;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-cn);
            background: var(--bg-dark);
            color: var(--text-dark-bg);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }

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

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

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

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            transition: background-color .3s, backdrop-filter .3s, border-color .3s;
            border-bottom: 1px solid transparent;
        }

        .header.scrolled {
            background: rgba(11, 15, 20, 0.8);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom-color: var(--border-white);
        }

        .header-inner {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
            gap: 16px;
        }

        .header-left,
        .header-right {
            display: flex;
            align-items: center;
            gap: 4px;
            flex: 1;
        }

        .header-right {
            justify-content: flex-end;
        }

        .header-center {
            flex-shrink: 0;
            display: flex;
            justify-content: center;
        }

        .logo {
            font-size: 24px;
            font-weight: 900;
            color: #fff;
            display: inline-flex;
            align-items: center;
            letter-spacing: 0.02em;
            white-space: nowrap;
        }

        .logo-accent {
            color: var(--accent);
        }

        .nav-link {
            color: rgba(255, 255, 255, 0.78);
            font-size: 15px;
            font-weight: 500;
            padding: 8px 14px;
            border-radius: var(--radius-btn);
            transition: color .2s, background-color .2s;
            position: relative;
            white-space: nowrap;
        }

        .nav-link:hover {
            color: #fff;
            background: rgba(255, 255, 255, 0.06);
        }

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

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

        .menu-toggle {
            display: none;
            width: 44px;
            height: 44px;
            border-radius: 12px;
            align-items: center;
            justify-content: center;
            color: #fff;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid var(--border-white);
        }

        .mobile-menu {
            position: fixed;
            top: 0;
            right: 0;
            bottom: 0;
            width: 280px;
            background: rgba(11, 15, 20, 0.98);
            backdrop-filter: blur(16px);
            z-index: 200;
            padding: 80px 24px 32px;
            transform: translateX(100%);
            transition: transform .4s ease;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .mobile-menu.open {
            transform: translateX(0);
        }

        .mobile-menu a {
            color: rgba(255, 255, 255, 0.85);
            font-size: 17px;
            font-weight: 500;
            padding: 14px 16px;
            border-radius: 12px;
            transition: background-color .2s;
        }

        .mobile-menu a:hover {
            background: rgba(255, 255, 255, 0.06);
        }

        .mobile-menu a.active {
            color: var(--accent);
            background: rgba(201, 255, 58, 0.08);
        }

        .mobile-menu-close {
            position: absolute;
            top: 16px;
            right: 16px;
            width: 40px;
            height: 40px;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            background: rgba(255, 255, 255, 0.06);
        }

        /* Hero */
        .hero-cat {
            position: relative;
            background: url('/assets/images/backpic/back-2.webp') center 40% / cover no-repeat;
            padding: 180px 0 110px;
            isolation: isolate;
        }

        .hero-cat::after {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(11, 15, 20, 0.72);
            z-index: -1;
        }

        .hero-cat .inner {
            max-width: 720px;
        }

        .hero-cat .breadcrumb {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
        }

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

        .hero-cat h1 {
            font-size: 42px;
            font-weight: 900;
            line-height: 1.15;
            color: #fff;
            margin-bottom: 16px;
        }

        .hero-cat h1 .accent-text {
            color: var(--accent);
        }

        .hero-cat .lead {
            font-size: 16px;
            line-height: 1.8;
            color: var(--text-dark-bg);
            max-width: 620px;
            margin-bottom: 36px;
        }

        .hero-actions {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 14px;
        }

        /* Buttons */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--accent);
            color: #0B0F14;
            font-size: 16px;
            font-weight: 700;
            padding: 14px 34px;
            border-radius: var(--radius-btn);
            transition: background-color .25s, transform .25s, box-shadow .25s;
            box-shadow: 0 4px 24px rgba(201, 255, 58, 0.2);
        }

        .btn-primary:hover {
            background: #fff;
            transform: scale(1.02);
            box-shadow: 0 8px 32px rgba(255, 255, 255, 0.18);
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            border: 1.5px solid rgba(255, 255, 255, 0.72);
            color: #fff;
            font-size: 16px;
            font-weight: 600;
            padding: 13px 32px;
            border-radius: var(--radius-btn);
            transition: background-color .25s, border-color .25s, transform .25s;
        }

        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: #fff;
            transform: scale(1.02);
        }

        /* Section base */
        .section {
            padding: 88px 0;
        }

        .section-title {
            font-size: 36px;
            font-weight: 700;
            line-height: 1.25;
            color: #fff;
            margin-bottom: 12px;
        }

        .section-title.light {
            color: #0B0F14;
        }

        .section-lead {
            font-size: 16px;
            line-height: 1.75;
            color: var(--text-muted);
            max-width: 560px;
        }

        .section-head {
            margin-bottom: 48px;
        }

        /* Feature blocks */
        .feature-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 64px;
            align-items: center;
        }

        .feature-media {
            border-radius: var(--radius-card);
            overflow: hidden;
            position: relative;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
        }

        .feature-media img {
            width: 100%;
            height: 380px;
            object-fit: cover;
            transition: transform .6s ease;
        }

        .feature-block:hover .feature-media img {
            transform: scale(1.03);
        }

        .feature-media .tag-badge {
            position: absolute;
            top: 16px;
            left: 16px;
            background: rgba(11, 15, 20, 0.7);
            backdrop-filter: blur(8px);
            border: 1px solid var(--border-white);
            color: var(--accent);
            font-size: 13px;
            font-weight: 600;
            padding: 6px 14px;
            border-radius: 999px;
        }

        .feature-content h3 {
            font-size: 28px;
            font-weight: 700;
            color: #fff;
            line-height: 1.3;
            margin-bottom: 16px;
        }

        .feature-content p {
            font-size: 15px;
            line-height: 1.8;
            color: var(--text-dark-bg);
            margin-bottom: 16px;
        }

        .feature-content.light h3 {
            color: #0B0F14;
        }

        .feature-content.light p {
            color: var(--text-light-bg);
        }

        .feature-list {
            list-style: none;
            margin-top: 20px;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .feature-list li {
            display: flex;
            gap: 10px;
            font-size: 14.5px;
            line-height: 1.7;
            align-items: flex-start;
        }

        .feature-list li .check-icon {
            flex-shrink: 0;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: rgba(201, 255, 58, 0.15);
            color: var(--accent);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-top: 3px;
        }

        /* Stats */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
        }

        .stat-card {
            background: #fff;
            border-radius: var(--radius-card);
            padding: 36px 24px;
            text-align: center;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
            border: 1px solid var(--border-black);
            transition: transform .3s, box-shadow .3s;
        }

        .stat-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 16px 40px rgba(0, 0, 0, 0.1);
        }

        .stat-number {
            font-family: var(--font-num);
            font-size: 64px;
            font-weight: 700;
            color: #0B0F14;
            line-height: 1.1;
            letter-spacing: -0.03em;
        }

        .stat-number .unit {
            font-size: 28px;
            color: var(--accent);
            margin-left: 2px;
        }

        .stat-label {
            font-size: 14px;
            color: var(--text-muted);
            margin-top: 12px;
        }

        /* FAQ */
        .faq-wrap {
            max-width: 760px;
        }

        .faq-item {
            border-bottom: 1px solid var(--border-black);
            padding: 0;
        }

        .faq-item:first-child {
            border-top: 1px solid var(--border-black);
        }

        .faq-toggle {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 22px 4px;
            text-align: left;
            background: none;
            border: none;
            font-size: 16px;
            font-weight: 600;
            color: #0B0F14;
            transition: color .2s;
            gap: 20px;
        }

        .faq-toggle:hover {
            color: rgba(0, 0, 0, 0.55);
        }

        .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            border: 1.5px solid rgba(0, 0, 0, 0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: 400;
            transition: transform .3s, border-color .3s;
            line-height: 1;
        }

        .faq-item.open .faq-icon {
            transform: rotate(45deg);
            border-color: #0B0F14;
            color: #0B0F14;
        }

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

        .faq-answer .inner {
            padding: 0 4px 24px;
            font-size: 14px;
            line-height: 1.8;
            color: #6B7280;
        }

        /* CTA */
        .cta-section {
            position: relative;
            background: url('/assets/images/backpic/back-1.webp') center / cover no-repeat;
            padding: 100px 0;
            isolation: isolate;
            text-align: center;
        }

        .cta-section::after {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(11, 15, 20, 0.8);
            z-index: -1;
        }

        .cta-title {
            font-size: 32px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }

        .cta-desc {
            font-size: 15px;
            color: var(--text-dark-bg);
            max-width: 480px;
            margin: 0 auto 32px;
            line-height: 1.7;
        }

        .next-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--accent);
            font-size: 15px;
            font-weight: 600;
            margin-top: 32px;
            transition: gap .25s;
        }

        .next-link:hover {
            gap: 12px;
        }

        /* Footer */
        .footer {
            background: var(--bg-dark);
            border-top: 1px solid var(--border-white);
            padding: 72px 0 32px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 48px;
            margin-bottom: 56px;
        }

        .footer-logo {
            font-size: 22px;
            font-weight: 900;
            color: #fff;
            margin-bottom: 14px;
            letter-spacing: 0.02em;
        }

        .footer-logo .logo-accent {
            color: var(--accent);
        }

        .footer-desc {
            font-size: 14px;
            line-height: 1.7;
            color: var(--text-muted);
            max-width: 320px;
        }

        .footer-col-title {
            font-size: 15px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
        }

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

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

        .footer-links a:hover {
            color: var(--accent);
            padding-left: 4px;
        }

        .footer-bottom {
            border-top: 1px solid var(--border-white);
            padding-top: 28px;
            text-align: center;
            font-size: 13px;
            color: var(--text-muted);
        }

        /* Animations */
        .reveal {
            opacity: 0;
            transform: translateY(20px);
            transition: opacity .5s ease-out, transform .5s ease-out;
        }

        .reveal.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .nav-link {
                padding: 8px 10px;
                font-size: 14px;
            }
            .feature-block {
                gap: 40px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }

        @media (max-width: 768px) {
            .header-left,
            .header-right {
                display: none;
            }
            .menu-toggle {
                display: flex;
            }
            .header-inner {
                height: 64px;
            }
            .section {
                padding: 64px 0;
            }
            .section-title {
                font-size: 28px;
            }
            .hero-cat {
                padding: 140px 0 80px;
            }
            .hero-cat h1 {
                font-size: 32px;
            }
            .feature-block {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .feature-media img {
                height: 260px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .stat-number {
                font-size: 44px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .cta-section {
                padding: 72px 0;
            }
            .cta-title {
                font-size: 24px;
            }
            .hero-actions .btn-primary,
            .hero-actions .btn-secondary {
                width: 100%;
                justify-content: center;
            }
        }

        @media (max-width: 480px) {
            .container {
                padding: 0 18px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
            }
            .stat-card {
                padding: 24px 14px;
            }
            .stat-number {
                font-size: 36px;
            }
            .hero-cat h1 {
                font-size: 28px;
            }
            .feature-content h3 {
                font-size: 22px;
            }
        }

/* roulang page: article */
:root {
  --color-dark: #0B0F14;
  --color-dark-card: #131A22;
  --color-accent: #C9FF3A;
  --color-light: #F4F5F7;
  --color-text: #1F2937;
  --color-text-light: #6B7280;
  --color-text-muted: #9CA3AF;
  --color-border: rgba(0, 0, 0, 0.08);
  --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-display: 'Space Grotesk', 'Inter', 'Noto Sans SC', sans-serif;
  --radius-card: 16px;
  --radius-pill: 999px;
  --shadow-card: 0 4px 24px rgba(11, 15, 20, 0.06);
  --shadow-card-hover: 0 12px 36px rgba(11, 15, 20, 0.1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--color-light);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Header / Nav ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition: background 0.3s, backdrop-filter 0.3s, border-bottom 0.3s;
  border-bottom: 1px solid transparent;
}

body.inner-page .header {
  background: rgba(11, 15, 20, 0.9);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.header.scrolled {
  background: rgba(11, 15, 20, 0.8);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-left,
.header-right {
  display: flex;
  align-items: center;
  gap: 36px;
  flex: 1;
}

.header-right {
  justify-content: flex-end;
}

.header-center {
  flex-shrink: 0;
}

.logo {
  font-size: 24px;
  font-weight: 900;
  color: #fff;
  letter-spacing: 0.02em;
  line-height: 1;
  display: inline-flex;
  align-items: baseline;
}

.logo-accent {
  color: var(--color-accent);
  font-family: var(--font-display);
}

.nav-link {
  color: rgba(255, 255, 255, 0.72);
  font-size: 15px;
  font-weight: 500;
  position: relative;
  padding: 6px 2px;
  transition: color 0.25s;
}

.nav-link:hover {
  color: #fff;
}

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

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

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: #fff;
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  transition: background 0.2s;
}

.menu-toggle:hover {
  background: rgba(255, 255, 255, 0.08);
}

/* ===== Article Page ===== */
.article-page {
  padding-top: 72px;
  min-height: 100vh;
  background: var(--color-light);
}

.article-breadcrumb {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 24px 0;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.article-breadcrumb a {
  color: var(--color-text-muted);
  transition: color 0.2s;
}

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

.article-breadcrumb .separator {
  color: #D1D5DB;
}

.article-breadcrumb .current {
  color: var(--color-dark);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 360px;
}

.article-container {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px;
}

.article-card {
  background: #fff;
  border-radius: var(--radius-card);
  padding: 48px 48px 40px;
  box-shadow: var(--shadow-card);
}

.article-category-pill {
  display: inline-flex;
  align-items: center;
  padding: 5px 14px;
  background: var(--color-accent);
  color: #111;
  font-size: 13px;
  font-weight: 700;
  border-radius: var(--radius-pill);
  margin-bottom: 20px;
  letter-spacing: 0.02em;
}

.article-title {
  font-size: 32px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--color-dark);
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

.article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  font-size: 14px;
  color: var(--color-text-muted);
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 32px;
}

.article-meta span + span::before {
  content: '';
  display: inline-block;
  width: 1px;
  height: 12px;
  background: #E5E7EB;
  margin: 0 14px;
  vertical-align: middle;
}

/* ===== Article Content ===== */
.article-content {
  font-size: 15px;
  color: #374151;
  line-height: 1.8;
  word-break: break-word;
}

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

.article-content h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-dark);
  margin: 40px 0 16px;
  padding-top: 8px;
}

.article-content h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-dark);
  margin: 32px 0 16px;
}

.article-content h4 {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-dark);
  margin: 24px 0 12px;
}

.article-content blockquote {
  border-left: 3px solid var(--color-accent);
  background: #F9FAFB;
  padding: 16px 20px;
  border-radius: 0 12px 12px 0;
  margin: 28px 0;
  color: var(--color-text-light);
  font-style: normal;
}

.article-content ul {
  list-style: none;
  padding-left: 0;
  margin: 16px 0 24px;
}

.article-content ul li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 10px;
}

.article-content ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(201, 255, 58, 0.2);
}

.article-content ol {
  counter-reset: article-counter;
  list-style: none;
  padding-left: 0;
  margin: 16px 0 24px;
}

.article-content ol li {
  counter-increment: article-counter;
  position: relative;
  padding-left: 28px;
  margin-bottom: 10px;
}

.article-content ol li::before {
  content: counter(article-counter) ".";
  position: absolute;
  left: 0;
  font-weight: 700;
  color: var(--color-accent);
  font-family: var(--font-display);
  font-size: 15px;
}

.article-content img {
  border-radius: var(--radius-card);
  border: 1px solid rgba(0, 0, 0, 0.05);
  margin: 32px 0;
  width: 100%;
  height: auto;
}

.article-content a {
  color: var(--color-dark);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 4px;
  font-weight: 500;
  transition: color 0.2s;
}

.article-content a:hover {
  color: #000;
  text-decoration-color: #000;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 14px;
}

.article-content th,
.article-content td {
  border: 1px solid rgba(0, 0, 0, 0.08);
  padding: 10px 14px;
  text-align: left;
}

.article-content th {
  background: #F9FAFB;
  font-weight: 600;
}

/* ===== Tags ===== */
.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.tag-pill {
  display: inline-flex;
  align-items: center;
  padding: 6px 16px;
  background: #F3F4F6;
  border-radius: var(--radius-pill);
  font-size: 13px;
  color: var(--color-text-light);
  font-weight: 500;
  transition: background 0.2s, color 0.2s, transform 0.2s;
  cursor: default;
}

.tag-pill:hover {
  background: var(--color-accent);
  color: #111;
  transform: translateY(-1px);
}

/* ===== Pagination ===== */
.article-pagination {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 24px;
  align-items: center;
}

.pagination-link {
  display: inline-flex;
  align-items: center;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-light);
  padding: 10px 20px;
  border: 1px solid rgba(0, 0, 0, 0.12);
  border-radius: var(--radius-pill);
  transition: all 0.25s;
  background: #fff;
  max-width: 280px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.pagination-link:hover {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: #111;
  transform: translateY(-1px);
}

/* ===== Related ===== */
.related-section {
  max-width: 720px;
  margin: 0 auto;
  padding: 56px 24px 64px;
}

.related-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
}

.related-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-dark);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.related-card {
  background: #fff;
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform 0.25s, box-shadow 0.25s;
  display: block;
}

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

.related-card-cover {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  transition: transform 0.3s;
}

.related-card:hover .related-card-cover {
  transform: scale(1.02);
}

.related-card-body {
  padding: 16px 16px 20px;
}

.related-card-category {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  color: var(--color-accent);
  background: #0B0F14;
  border-radius: var(--radius-pill);
  padding: 3px 12px;
  margin-bottom: 12px;
}

.related-card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-dark);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 8px;
}

.related-card-summary {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.related-action {
  display: flex;
  justify-content: center;
  margin-top: 40px;
}

/* ===== Not Found ===== */
.not-found-card {
  text-align: center;
  padding: 64px 40px;
}

.not-found-card h1 {
  font-size: 32px;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 16px;
}

.not-found-card p {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 32px;
}

/* ===== Buttons ===== */
.btn-solid {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent);
  color: #111;
  font-size: 16px;
  font-weight: 700;
  padding: 12px 32px;
  border-radius: var(--radius-pill);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.25s;
}

.btn-solid:hover {
  background: #fff;
  transform: scale(1.02);
  box-shadow: 0 8px 24px rgba(201, 255, 58, 0.3);
  border-color: var(--color-accent);
}

.btn-outline-dark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--color-dark);
  font-size: 15px;
  font-weight: 600;
  padding: 11px 32px;
  border-radius: var(--radius-pill);
  border: 1.5px solid var(--color-dark);
  cursor: pointer;
  transition: all 0.25s;
}

.btn-outline-dark:hover {
  background: var(--color-dark);
  color: #fff;
  transform: scale(1.02);
}

/* ===== Footer ===== */
.footer {
  background: var(--color-dark);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 64px 0 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
}

.footer-logo {
  font-size: 22px;
  font-weight: 900;
  color: #fff;
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}

.footer-desc {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.45);
  line-height: 1.8;
  max-width: 300px;
}

.footer-col-title {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 18px;
}

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

.footer-links a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.55);
  transition: color 0.2s;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  margin-top: 48px;
  padding-top: 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.35);
}

/* ===== Responsive ===== */
@media (max-width: 1023px) {
  .header-inner {
    flex-wrap: wrap;
    height: auto;
    min-height: 72px;
  }

  .header-left,
  .header-right {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: center;
    gap: 18px;
    padding: 12px 0 20px;
    order: 3;
  }

  .header-right {
    order: 4;
    padding-top: 0;
  }

  .header-left.show,
  .header-right.show {
    display: flex;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .nav-link.active::after {
    bottom: -2px;
  }
}

@media (max-width: 768px) {
  .article-breadcrumb {
    padding-top: 24px;
  }

  .article-card {
    padding: 32px 24px 28px;
    border-radius: 12px;
  }

  .article-title {
    font-size: 26px;
  }

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

  .article-content h2 {
    font-size: 21px;
  }

  .related-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .related-section {
    padding: 48px 20px 56px;
  }

  .related-header {
    margin-bottom: 20px;
  }

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

  .pagination-link {
    max-width: 100%;
    justify-content: center;
  }

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

@media (max-width: 520px) {
  .container {
    padding: 0 16px;
  }

  .article-breadcrumb {
    padding-left: 16px;
    padding-right: 16px;
  }

  .article-container {
    padding: 16px;
  }

  .article-card {
    padding: 28px 20px 24px;
  }

  .article-title {
    font-size: 24px;
    line-height: 1.35;
  }

  .article-meta span + span::before {
    margin: 0 8px;
  }

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

/* roulang page: category2 */
:root {
            --bg-dark: #0B0F14;
            --bg-card-dark: #131A22;
            --bg-light: #F4F5F7;
            --bg-card-light: #FFFFFF;
            --accent: #C9FF3A;
            --accent-hover: #FFFFFF;
            --text-dark-bg: #D1D5DB;
            --text-light-bg: #374151;
            --text-muted: #9CA3AF;
            --border-dark: rgba(255, 255, 255, 0.08);
            --border-light: rgba(0, 0, 0, 0.08);
            --radius-card: 16px;
            --radius-btn: 9999px;
            --radius-input: 8px;
            --shadow-soft: 0 4px 24px rgba(0, 0, 0, 0.06);
            --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.12);
        }

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

        body {
            font-family: 'Noto Sans SC', sans-serif;
            background: var(--bg-dark);
            color: var(--text-dark-bg);
            line-height: 1.8;
            -webkit-font-smoothing: antialiased;
        }

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

        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.3s ease;
        }

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

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .container-sm {
            max-width: 960px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* 数字字体 */
        .font-num {
            font-family: 'Space Grotesk', 'Inter', sans-serif;
            font-variant-numeric: tabular-nums;
        }

        /* ===== Header ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: transparent;
            transition: all 0.4s ease;
            padding: 18px 0;
        }

        .header.scrolled {
            background: rgba(11, 15, 20, 0.85);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            padding: 12px 0;
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 24px;
            position: relative;
            min-height: 48px;
        }

        .header-left,
        .header-right {
            display: flex;
            align-items: center;
            gap: 36px;
            flex: 1;
        }

        .header-right {
            justify-content: flex-end;
        }

        .header-center {
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            z-index: 2;
        }

        .logo {
            display: inline-flex;
            align-items: center;
            gap: 2px;
            font-size: 24px;
            font-weight: 900;
            letter-spacing: 0;
            color: #fff;
            line-height: 1;
            white-space: nowrap;
        }

        .logo-accent {
            color: var(--accent);
        }

        .nav-link {
            font-size: 15px;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.75);
            position: relative;
            padding: 6px 0;
            transition: color 0.3s ease;
            white-space: nowrap;
        }

        .nav-link:hover {
            color: #ffffff;
        }

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

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

        .menu-toggle {
            display: none;
            color: #fff;
            padding: 8px;
            z-index: 1100;
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: 8px;
            width: 42px;
            height: 42px;
            align-items: center;
            justify-content: center;
            transition: all 0.3s ease;
        }

        .menu-toggle:hover {
            background: rgba(255, 255, 255, 0.08);
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background: rgba(11, 15, 20, 0.97);
            backdrop-filter: blur(20px);
            padding: 90px 32px 40px;
            z-index: 1050;
            min-height: 100vh;
            flex-direction: column;
            gap: 8px;
        }

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

        .mobile-menu a {
            font-size: 22px;
            font-weight: 700;
            color: #fff;
            padding: 16px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }

        .mobile-menu a.active {
            color: var(--accent);
        }

        /* ===== Hero ===== */
        .category-hero {
            position: relative;
            min-height: 420px;
            display: flex;
            align-items: center;
            background: linear-gradient(135deg, rgba(11, 15, 20, 0.92), rgba(11, 15, 20, 0.7)), url('/assets/images/backpic/back-2.webp') center/cover;
            padding: 140px 0 80px;
        }

        .category-hero .container {
            position: relative;
            z-index: 2;
        }

        .category-hero .breadcrumb {
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 24px;
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
        }

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

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

        .category-hero .breadcrumb .sep {
            color: rgba(255, 255, 255, 0.3);
        }

        .category-hero h1 {
            font-size: 48px;
            font-weight: 900;
            color: #ffffff;
            line-height: 1.15;
            margin-bottom: 20px;
            letter-spacing: -0.02em;
        }

        .category-hero .hero-desc {
            font-size: 16px;
            color: rgba(255, 255, 255, 0.75);
            max-width: 560px;
            line-height: 1.8;
            margin-bottom: 32px;
        }

        .hero-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
        }

        .hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 18px;
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 999px;
            color: rgba(255, 255, 255, 0.8);
            font-size: 14px;
            font-weight: 500;
            transition: all 0.3s ease;
        }

        .hero-tag:hover {
            background: var(--accent);
            color: #000;
            border-color: var(--accent);
            transform: translateY(-2px);
        }

        .hero-tag i {
            font-size: 12px;
            color: var(--accent);
        }

        .hero-tag:hover i {
            color: #000;
        }

        /* ===== 数据大图区 ===== */
        .section {
            padding: 96px 0;
        }

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

        .section-light {
            background: var(--bg-light);
            color: var(--text-light-bg);
        }

        .section-label {
            font-size: 14px;
            font-weight: 700;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--accent);
            margin-bottom: 12px;
            display: block;
        }

        .section-title {
            font-size: 40px;
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: 16px;
            color: inherit;
        }

        .section-desc {
            font-size: 16px;
            color: var(--text-muted);
            max-width: 640px;
            line-height: 1.8;
            margin-bottom: 48px;
        }

        .section-light .section-desc {
            color: #6B7280;
        }

        /* ===== 图文交替块 ===== */
        .split-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 64px;
            align-items: center;
            margin-bottom: 120px;
        }

        .split-block:last-child {
            margin-bottom: 0;
        }

        .split-block.reversed .split-media {
            order: 2;
        }

        .split-media {
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-soft);
            position: relative;
        }

        .split-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            aspect-ratio: 4/3;
            transition: transform 0.6s ease;
        }

        .split-block:hover .split-media img {
            transform: scale(1.03);
        }

        .split-media .media-badge {
            position: absolute;
            top: 16px;
            left: 16px;
            background: var(--accent);
            color: #0B0F14;
            font-size: 13px;
            font-weight: 700;
            padding: 6px 14px;
            border-radius: 999px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .split-content .block-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 14px;
            background: rgba(201, 255, 58, 0.1);
            border: 1px solid rgba(201, 255, 58, 0.3);
            border-radius: 999px;
            font-size: 13px;
            font-weight: 600;
            color: var(--accent);
            margin-bottom: 20px;
        }

        .split-content h2 {
            font-size: 28px;
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 16px;
            color: #fff;
        }

        .split-content p {
            font-size: 15px;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.65);
            margin-bottom: 20px;
        }

        .split-content .feature-list {
            list-style: none;
            padding: 0;
            margin: 0 0 24px;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .split-content .feature-list li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            font-size: 15px;
            color: rgba(255, 255, 255, 0.8);
        }

        .split-content .feature-list li i {
            color: var(--accent);
            font-size: 14px;
            margin-top: 5px;
            flex-shrink: 0;
        }

        .split-content .btn-outline-sm {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border: 1.5px solid rgba(255, 255, 255, 0.3);
            border-radius: 999px;
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            transition: all 0.3s ease;
        }

        .split-content .btn-outline-sm:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: var(--accent);
            color: var(--accent);
        }

        /* ===== 指标区 ===== */
        .metrics-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
        }

        .metric-card {
            background: var(--bg-card-dark);
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-card);
            padding: 40px 32px;
            text-align: center;
            transition: all 0.4s ease;
        }

        .metric-card:hover {
            transform: translateY(-6px);
            border-color: rgba(201, 255, 58, 0.3);
        }

        .metric-icon {
            width: 64px;
            height: 64px;
            margin: 0 auto 20px;
            border-radius: 50%;
            border: 1px solid rgba(201, 255, 58, 0.3);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent);
            font-size: 24px;
            background: rgba(201, 255, 58, 0.06);
        }

        .metric-value {
            font-family: 'Space Grotesk', sans-serif;
            font-size: 52px;
            font-weight: 700;
            color: var(--accent);
            line-height: 1.1;
            margin-bottom: 8px;
            font-variant-numeric: tabular-nums;
        }

        .metric-unit {
            font-size: 18px;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.6);
            margin-left: 2px;
        }

        .metric-name {
            font-size: 16px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 8px;
        }

        .metric-desc {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* ===== 场景应用 ===== */
        .scene-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
        }

        .scene-card {
            background: var(--bg-card-light);
            border-radius: var(--radius-card);
            padding: 36px;
            box-shadow: var(--shadow-soft);
            border: 1px solid var(--border-light);
            transition: all 0.4s ease;
        }

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

        .scene-card .scene-icon {
            width: 56px;
            height: 56px;
            border-radius: 12px;
            background: #F0F0F0;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: #0B0F14;
            margin-bottom: 20px;
        }

        .scene-card h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-light-bg);
            margin-bottom: 12px;
        }

        .scene-card p {
            font-size: 14px;
            color: #6B7280;
            line-height: 1.7;
            margin-bottom: 16px;
        }

        .scene-card .scene-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .scene-card .scene-tags span {
            padding: 4px 10px;
            background: #F4F5F7;
            border-radius: 6px;
            font-size: 12px;
            font-weight: 500;
            color: #6B7280;
        }

        /* ===== 功能区 ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .feature-card {
            background: var(--bg-card-dark);
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-card);
            padding: 32px;
            transition: all 0.3s ease;
        }

        .feature-card:hover {
            border-color: rgba(201, 255, 58, 0.3);
            transform: translateY(-4px);
        }

        .feature-card i {
            font-size: 28px;
            color: var(--accent);
            margin-bottom: 20px;
            display: block;
        }

        .feature-card h3 {
            font-size: 18px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 12px;
        }

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

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

        .faq-item {
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .faq-item:last-child {
            border-bottom: none;
        }

        .faq-item:first-child {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 24px 8px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            color: #fff;
            transition: color 0.3s ease;
            user-select: none;
        }

        .faq-question:hover {
            color: var(--accent);
        }

        .faq-icon {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            border: 1px solid rgba(255, 255, 255, 0.2);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            transition: all 0.4s ease;
            flex-shrink: 0;
            margin-left: 16px;
            color: rgba(255, 255, 255, 0.6);
        }

        .faq-item.open .faq-icon {
            transform: rotate(45deg);
            background: var(--accent);
            border-color: var(--accent);
            color: #0B0F14;
        }

        .faq-item.open .faq-question {
            color: var(--accent);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease;
        }

        .faq-answer-inner {
            padding: 0 8px 24px;
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.8;
        }

        /* ===== CTA ===== */
        .cta-section {
            position: relative;
            padding: 100px 0;
            background: linear-gradient(135deg, rgba(11, 15, 20, 0.92), rgba(11, 15, 20, 0.82)), url('/assets/images/backpic/back-1.webp') center/cover;
            text-align: center;
        }

        .cta-section .container {
            position: relative;
            z-index: 2;
        }

        .cta-title {
            font-size: 36px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
        }

        .cta-sub {
            font-size: 16px;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 40px;
            max-width: 520px;
            margin-left: auto;
            margin-right: auto;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            background: var(--accent);
            color: #0B0F14;
            font-size: 16px;
            font-weight: 700;
            padding: 16px 40px;
            border-radius: var(--radius-btn);
            transition: all 0.3s ease;
            border: 2px solid transparent;
        }

        .btn-primary:hover {
            background: #ffffff;
            transform: scale(1.03);
        }

        .btn-primary:focus-visible {
            outline: 3px solid rgba(201, 255, 58, 0.5);
            outline-offset: 4px;
        }

        /* ===== 返回入口 ===== */
        .next-cat {
            padding: 60px 0;
            background: var(--bg-dark);
            text-align: center;
            border-top: 1px solid var(--border-dark);
        }

        .next-cat a {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            color: var(--accent);
            font-size: 15px;
            font-weight: 600;
            padding: 12px 32px;
            border: 1px solid rgba(201, 255, 58, 0.3);
            border-radius: 999px;
            transition: all 0.3s ease;
        }

        .next-cat a:hover {
            background: rgba(201, 255, 58, 0.1);
            transform: translateX(4px);
        }

        .next-cat a i {
            font-size: 14px;
        }

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

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 48px;
            margin-bottom: 48px;
        }

        .footer-logo {
            font-size: 24px;
            font-weight: 900;
            color: #fff;
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 2px;
        }

        .footer-desc {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 300px;
        }

        .footer-col-title {
            font-size: 15px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 20px;
            letter-spacing: 0.02em;
        }

        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .footer-links a {
            font-size: 14px;
            color: var(--text-muted);
            transition: color 0.3s ease;
        }

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

        .footer-bottom {
            border-top: 1px solid var(--border-dark);
            padding: 24px 0;
            text-align: center;
        }

        .footer-bottom p {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
        }

        /* ===== 滚动渐现 ===== */
        .reveal {
            opacity: 0;
            transform: translateY(24px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }

        .reveal.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .header-left,
            .header-right {
                display: none;
            }

            .menu-toggle {
                display: flex;
            }

            .header-center {
                left: 24px;
                transform: none;
                position: relative;
            }

            .header-inner {
                justify-content: space-between;
            }

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

            .category-hero h1 {
                font-size: 36px;
            }

            .split-block {
                grid-template-columns: 1fr;
                gap: 40px;
                margin-bottom: 80px;
            }

            .split-block.reversed .split-media {
                order: 1;
            }

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

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

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

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

        @media (max-width: 640px) {
            .container {
                padding: 0 16px;
            }

            .section {
                padding: 64px 0;
            }

            .section-title {
                font-size: 28px;
            }

            .category-hero {
                min-height: 360px;
                padding: 110px 0 60px;
            }

            .category-hero h1 {
                font-size: 32px;
            }

            .category-hero .hero-desc {
                font-size: 15px;
            }

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

            .metric-value {
                font-size: 42px;
            }

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

            .scene-card {
                padding: 24px;
            }

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

            .cta-title {
                font-size: 28px;
            }

            .btn-primary {
                width: 100%;
                padding: 16px 24px;
            }

            .split-content h2 {
                font-size: 22px;
            }

            .faq-question {
                font-size: 15px;
                padding: 18px 4px;
            }
        }

        @media (max-width: 480px) {
            .hero-tag {
                font-size: 13px;
                padding: 6px 14px;
            }

            .metrics-grid {
                gap: 16px;
            }

            .metric-card {
                padding: 28px 20px;
            }
        }

        /* 无障碍焦点 */
        a:focus-visible,
        button:focus-visible {
            outline: 3px solid var(--accent);
            outline-offset: 3px;
        }

        /* 自定义滚动条 */
        ::-webkit-scrollbar {
            width: 8px;
        }
        ::-webkit-scrollbar-track {
            background: #0B0F14;
        }
        ::-webkit-scrollbar-thumb {
            background: rgba(255, 255, 255, 0.15);
            border-radius: 4px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: rgba(201, 255, 58, 0.3);
        }