/* roulang page: index */
:root {
  --primary: #1a1a3e;
  --primary-light: #2a2a5e;
  --primary-dark: #0f0c29;
  --accent: #f6a623;
  --accent-hover: #e0951a;
  --accent-light: #fef3e0;
  --bg-body: #f8f9fa;
  --bg-white: #ffffff;
  --bg-dark: #0f0c29;
  --bg-card: #ffffff;
  --text-main: #1a1a2e;
  --text-light: #6c757d;
  --text-white: #ffffff;
  --border: #e9ecef;
  --border-light: #f1f3f5;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  --container: 1200px;
  --header-h: 72px;
}

*, *::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: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent); }

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

button, input, textarea { font-family: inherit; font-size: inherit; outline: none; }
button { cursor: pointer; border: none; background: none; }
input { border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 10px 16px; transition: var(--transition); }
input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(246,166,35,0.15); }

ul, ol { list-style: none; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

.section { padding: 80px 0; }
.section-title { font-size: 32px; font-weight: 700; color: var(--primary); text-align: center; margin-bottom: 12px; }
.section-subtitle { font-size: 17px; color: var(--text-light); text-align: center; max-width: 640px; margin: 0 auto 48px; line-height: 1.6; }
.section-divider { width: 60px; height: 4px; background: linear-gradient(90deg, var(--accent), var(--primary-light)); border-radius: 2px; margin: 16px auto 24px; }

.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 12px 28px; border-radius: var(--radius-md); font-weight: 600; font-size: 16px; transition: var(--transition); white-space: nowrap; border: 2px solid transparent;
}
.btn-primary { background: var(--accent); color: var(--primary-dark); border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(246,166,35,0.35); }
.btn-outline { background: transparent; color: var(--text-white); border-color: rgba(255,255,255,0.4); }
.btn-outline:hover { background: rgba(255,255,255,0.1); border-color: var(--text-white); color: var(--text-white); transform: translateY(-2px); }
.btn-lg { padding: 16px 36px; font-size: 18px; border-radius: var(--radius-lg); }

.badge {
  display: inline-block; padding: 4px 14px; border-radius: 100px; font-size: 13px; font-weight: 500; background: var(--accent-light); color: var(--accent);
}

.card {
  background: var(--bg-card); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); transition: var(--transition); overflow: hidden;
}
.card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }

/* ===== HEADER / NAV ===== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; height: var(--header-h); background: rgba(255,255,255,0.96); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); z-index: 1000; transition: var(--transition);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 100%; }
.logo { display: flex; align-items: center; gap: 10px; font-size: 20px; font-weight: 800; color: var(--primary); }
.logo i { font-size: 26px; color: var(--accent); }
.logo span { background: linear-gradient(135deg, var(--primary), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.logo:hover span { -webkit-text-fill-color: var(--accent); }

.nav-list { display: flex; align-items: center; gap: 8px; }
.nav-list a {
  display: block; padding: 8px 18px; border-radius: var(--radius-sm); font-size: 15px; font-weight: 500; color: var(--text-main); transition: var(--transition); position: relative;
}
.nav-list a:hover { color: var(--accent); background: var(--accent-light); }
.nav-list a.active { color: var(--accent); background: var(--accent-light); font-weight: 600; }
.nav-list a.active::after { content: ''; position: absolute; bottom: 2px; left: 50%; transform: translateX(-50%); width: 20px; height: 3px; background: var(--accent); border-radius: 2px; }

.header-actions { display: flex; align-items: center; gap: 16px; }
.header-search { display: flex; align-items: center; background: var(--bg-body); border-radius: 100px; padding: 0 16px; border: 1px solid var(--border); transition: var(--transition); }
.header-search:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(246,166,35,0.12); }
.header-search input { border: none; background: transparent; padding: 8px 8px; width: 160px; font-size: 14px; }
.header-search input::placeholder { color: var(--text-light); }
.header-search button { color: var(--text-light); padding: 8px 4px; font-size: 15px; transition: var(--transition); }
.header-search button:hover { color: var(--accent); }

.header-cta { padding: 10px 24px; border-radius: 100px; background: var(--accent); color: var(--primary-dark); font-weight: 700; font-size: 14px; border: none; transition: var(--transition); }
.header-cta:hover { background: var(--accent-hover); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(246,166,35,0.3); color: var(--primary-dark); }

.mobile-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; cursor: pointer; background: none; border: none; }
.mobile-toggle span { display: block; width: 26px; height: 2.5px; background: var(--primary); border-radius: 2px; transition: var(--transition); }

/* ===== HERO ===== */
.hero {
  min-height: 100vh; display: flex; align-items: center; position: relative; padding: calc(var(--header-h) + 40px) 0 80px; overflow: hidden; background: var(--bg-dark);
}
.hero-bg {
  position: absolute; inset: 0; background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat; opacity: 0.35; z-index: 1;
}
.hero-overlay {
  position: absolute; inset: 0; background: linear-gradient(135deg, rgba(15,12,41,0.85) 0%, rgba(26,26,62,0.7) 50%, rgba(15,12,41,0.85) 100%); z-index: 2;
}
.hero-content { position: relative; z-index: 3; text-align: center; max-width: 800px; margin: 0 auto; }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; background: rgba(246,166,35,0.15); color: var(--accent); padding: 6px 20px; border-radius: 100px; font-size: 14px; font-weight: 500; margin-bottom: 24px; border: 1px solid rgba(246,166,35,0.2); }
.hero-title { font-size: 52px; font-weight: 800; color: var(--text-white); line-height: 1.15; margin-bottom: 20px; letter-spacing: -0.5px; }
.hero-title em { font-style: normal; background: linear-gradient(135deg, var(--accent), #ffd700); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-desc { font-size: 19px; color: rgba(255,255,255,0.7); max-width: 600px; margin: 0 auto 36px; line-height: 1.7; }
.hero-actions { display: flex; align-items: center; justify-content: center; gap: 16px; flex-wrap: wrap; }
.hero-actions .btn i { font-size: 18px; }

.hero-stats { display: flex; justify-content: center; gap: 48px; margin-top: 56px; flex-wrap: wrap; }
.hero-stat { text-align: center; }
.hero-stat-num { font-size: 36px; font-weight: 800; color: var(--text-white); }
.hero-stat-num span { color: var(--accent); }
.hero-stat-label { font-size: 14px; color: rgba(255,255,255,0.55); margin-top: 4px; }

/* ===== FEATURES ===== */
.features-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 28px; }
.feature-card { background: var(--bg-card); border-radius: var(--radius-md); padding: 36px 28px; box-shadow: var(--shadow-sm); transition: var(--transition); text-align: center; border: 1px solid var(--border-light); }
.feature-card:hover { box-shadow: var(--shadow-md); transform: translateY(-6px); border-color: var(--accent-light); }
.feature-icon { width: 64px; height: 64px; margin: 0 auto 20px; background: var(--accent-light); border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; font-size: 28px; color: var(--accent); transition: var(--transition); }
.feature-card:hover .feature-icon { background: var(--accent); color: var(--text-white); }
.feature-title { font-size: 20px; font-weight: 700; color: var(--primary); margin-bottom: 10px; }
.feature-desc { font-size: 15px; color: var(--text-light); line-height: 1.6; }

/* ===== PROCESS ===== */
.process { background: var(--bg-white); }
.process-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 24px; position: relative; }
.process-item { text-align: center; position: relative; }
.process-step { width: 56px; height: 56px; margin: 0 auto 18px; background: var(--primary); color: var(--text-white); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 22px; font-weight: 700; position: relative; z-index: 2; transition: var(--transition); }
.process-item:hover .process-step { background: var(--accent); color: var(--primary-dark); transform: scale(1.08); }
.process-item:not(:last-child)::after { content: ''; position: absolute; top: 28px; left: calc(50% + 40px); width: calc(100% - 80px); height: 2px; background: var(--border); z-index: 1; }
.process-title { font-size: 18px; font-weight: 600; color: var(--primary); margin-bottom: 6px; }
.process-desc { font-size: 14px; color: var(--text-light); line-height: 1.5; max-width: 200px; margin: 0 auto; }

/* ===== CATEGORY ENTRY ===== */
.category-entry { background: var(--bg-body); }
.category-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 28px; }
.category-card {
  display: flex; align-items: center; gap: 28px; background: var(--bg-card); border-radius: var(--radius-md); padding: 28px; box-shadow: var(--shadow-sm); transition: var(--transition); border: 1px solid var(--border-light);
}
.category-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); border-color: var(--accent-light); }
.category-img { width: 180px; height: 130px; border-radius: var(--radius-sm); object-fit: cover; flex-shrink: 0; background: var(--border-light); }
.category-info { flex: 1; }
.category-info h3 { font-size: 20px; font-weight: 700; color: var(--primary); margin-bottom: 8px; }
.category-info p { font-size: 15px; color: var(--text-light); line-height: 1.6; margin-bottom: 14px; }
.category-link { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; color: var(--accent); font-size: 15px; }
.category-link i { transition: var(--transition); }
.category-link:hover i { transform: translateX(4px); }

/* ===== NEWS LIST (CMS) ===== */
.news-list { background: var(--bg-white); }
.news-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 24px; }
.news-card { display: flex; gap: 20px; background: var(--bg-card); border-radius: var(--radius-md); padding: 24px; box-shadow: var(--shadow-sm); transition: var(--transition); border: 1px solid var(--border-light); }
.news-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); border-color: var(--accent-light); }
.news-card-img { width: 130px; height: 100px; border-radius: var(--radius-sm); object-fit: cover; flex-shrink: 0; background: var(--border-light); }
.news-card-body { flex: 1; display: flex; flex-direction: column; justify-content: space-between; }
.news-card-body h3 { font-size: 17px; font-weight: 600; color: var(--primary); line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-card-body h3 a { color: inherit; }
.news-card-body h3 a:hover { color: var(--accent); }
.news-meta { display: flex; align-items: center; gap: 16px; margin-top: 10px; font-size: 13px; color: var(--text-light); }
.news-meta .tag { background: var(--accent-light); color: var(--accent); padding: 2px 12px; border-radius: 100px; font-size: 12px; font-weight: 500; }
.news-empty { grid-column: 1 / -1; text-align: center; padding: 48px; color: var(--text-light); font-size: 16px; background: var(--bg-body); border-radius: var(--radius-md); }

/* ===== STATS ===== */
.stats-block { background: var(--bg-dark); position: relative; overflow: hidden; }
.stats-block::before { content: ''; position: absolute; inset: 0; background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat; opacity: 0.1; }
.stats-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 32px; position: relative; z-index: 2; }
.stat-item { text-align: center; padding: 24px; }
.stat-item .num { font-size: 44px; font-weight: 800; color: var(--accent); line-height: 1.1; }
.stat-item .label { font-size: 16px; color: rgba(255,255,255,0.65); margin-top: 8px; }
.stat-item .desc { font-size: 14px; color: rgba(255,255,255,0.4); margin-top: 4px; }
.stat-item + .stat-item { border-left: 1px solid rgba(255,255,255,0.08); }

/* ===== FAQ ===== */
.faq { background: var(--bg-body); }
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item { background: var(--bg-card); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); overflow: hidden; border: 1px solid var(--border-light); transition: var(--transition); }
.faq-item:hover { box-shadow: var(--shadow-md); }
.faq-question { display: flex; align-items: center; justify-content: space-between; padding: 20px 24px; cursor: pointer; font-size: 16px; font-weight: 600; color: var(--primary); background: none; border: none; width: 100%; text-align: left; transition: var(--transition); }
.faq-question i { color: var(--accent); font-size: 18px; transition: var(--transition); }
.faq-item.active .faq-question i { transform: rotate(180deg); }
.faq-answer { padding: 0 24px; max-height: 0; overflow: hidden; transition: var(--transition); color: var(--text-light); font-size: 15px; line-height: 1.7; }
.faq-item.active .faq-answer { padding: 0 24px 20px; max-height: 300px; }

/* ===== CTA ===== */
.cta-block {
  background: var(--primary); position: relative; overflow: hidden; padding: 80px 0;
}
.cta-block::before { content: ''; position: absolute; inset: 0; background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat; opacity: 0.08; }
.cta-inner { position: relative; z-index: 2; text-align: center; max-width: 680px; margin: 0 auto; }
.cta-inner h2 { font-size: 34px; font-weight: 700; color: var(--text-white); margin-bottom: 14px; }
.cta-inner p { font-size: 17px; color: rgba(255,255,255,0.65); margin-bottom: 32px; line-height: 1.6; }
.cta-inner .btn i { font-size: 18px; }

/* ===== FOOTER ===== */
.site-footer { background: var(--primary-dark); color: rgba(255,255,255,0.6); padding: 48px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 36px; }
.footer-brand .logo { color: var(--text-white); margin-bottom: 14px; }
.footer-brand .logo span { -webkit-text-fill-color: var(--text-white); }
.footer-brand p { font-size: 14px; line-height: 1.7; max-width: 300px; }
.footer-social { display: flex; gap: 12px; margin-top: 18px; }
.footer-social a { width: 38px; height: 38px; border-radius: 50%; background: rgba(255,255,255,0.08); display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,0.5); transition: var(--transition); font-size: 16px; }
.footer-social a:hover { background: var(--accent); color: var(--primary-dark); }
.footer-col h4 { font-size: 16px; font-weight: 600; color: var(--text-white); margin-bottom: 16px; }
.footer-col a { display: block; font-size: 14px; color: rgba(255,255,255,0.5); padding: 4px 0; transition: var(--transition); }
.footer-col a:hover { color: var(--accent); padding-left: 4px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.06); padding-top: 20px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; font-size: 13px; color: rgba(255,255,255,0.35); }
.footer-bottom a { color: rgba(255,255,255,0.35); }
.footer-bottom a:hover { color: var(--accent); }

/* ===== MOBILE ===== */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2,1fr); }
  .process-grid { grid-template-columns: repeat(2,1fr); }
  .process-item:nth-child(2)::after { display: none; }
  .stats-grid { grid-template-columns: repeat(2,1fr); }
  .stat-item + .stat-item { border-left: none; }
  .footer-grid { grid-template-columns: repeat(2,1fr); gap: 32px; }
}

@media (max-width: 768px) {
  .section { padding: 56px 0; }
  .section-title { font-size: 26px; }
  .section-subtitle { font-size: 15px; margin-bottom: 32px; }

  .mobile-toggle { display: flex; }
  .nav-list { position: fixed; top: var(--header-h); left: 0; right: 0; background: var(--bg-white); flex-direction: column; padding: 16px 24px; border-bottom: 1px solid var(--border); box-shadow: var(--shadow-md); transform: translateY(-120%); opacity: 0; transition: var(--transition); pointer-events: none; }
  .nav-list.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav-list a { width: 100%; padding: 14px 16px; font-size: 16px; }
  .nav-list a.active::after { display: none; }
  .nav-list a.active { background: var(--accent-light); border-radius: var(--radius-sm); }

  .header-search input { width: 100px; }
  .header-cta { padding: 8px 16px; font-size: 13px; }

  .hero-title { font-size: 32px; }
  .hero-desc { font-size: 16px; }
  .hero-stats { gap: 24px; }
  .hero-stat-num { font-size: 28px; }

  .features-grid { grid-template-columns: 1fr; }
  .category-grid { grid-template-columns: 1fr; }
  .category-card { flex-direction: column; text-align: center; }
  .category-img { width: 100%; height: 160px; }
  .news-grid { grid-template-columns: 1fr; }
  .news-card { flex-direction: column; }
  .news-card-img { width: 100%; height: 140px; }

  .process-grid { grid-template-columns: 1fr; gap: 32px; }
  .process-item::after { display: none !important; }

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

  .faq-question { font-size: 15px; padding: 16px 18px; }

  .cta-inner h2 { font-size: 26px; }
  .cta-inner p { font-size: 15px; }

  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 520px) {
  .container { padding: 0 16px; }
  .hero-title { font-size: 26px; }
  .hero-actions { flex-direction: column; width: 100%; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .header-actions .header-cta { display: none; }
  .header-search { flex: 1; }
  .header-search input { width: 100%; }
  .btn-lg { padding: 14px 28px; font-size: 16px; }
  .section-title { font-size: 22px; }
}

/* roulang page: article */
:root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #dbeafe;
            --secondary: #7c3aed;
            --accent: #f59e0b;
            --bg: #ffffff;
            --bg-alt: #f8fafc;
            --bg-card: #ffffff;
            --text: #0f172a;
            --text-medium: #334155;
            --text-weak: #64748b;
            --text-inverse: #ffffff;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 2px 8px rgba(0,0,0,0.04);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.1), 0 4px 16px rgba(0,0,0,0.06);
            --shadow-xl: 0 24px 60px rgba(0,0,0,0.14);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --max-width: 1200px;
            --header-height: 72px;
        }

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

        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }

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

        a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--primary-dark); }
        a:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 2px; }

        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-md); }

        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* === Header / Nav === */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border);
            height: var(--header-height);
            display: flex;
            align-items: center;
        }

        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 700;
            color: var(--text);
            text-decoration: none;
            letter-spacing: -0.3px;
        }
        .logo i { color: var(--primary); font-size: 26px; }
        .logo:hover { color: var(--primary); }
        .logo span { white-space: nowrap; }

        .nav-list {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .nav-list a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-medium);
            text-decoration: none;
            transition: all var(--transition);
            position: relative;
        }
        .nav-list a:hover { color: var(--primary); background: var(--primary-light); }
        .nav-list a.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 600;
        }
        .nav-list a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60%;
            height: 3px;
            background: var(--primary);
            border-radius: 4px 4px 0 0;
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .search-box {
            display: flex;
            align-items: center;
            background: var(--bg-alt);
            border: 1px solid var(--border);
            border-radius: 40px;
            padding: 0 16px;
            transition: all var(--transition);
        }
        .search-box:focus-within {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px var(--primary-light);
        }
        .search-box i { color: var(--text-weak); font-size: 15px; }
        .search-box input {
            border: none;
            background: transparent;
            padding: 8px 10px;
            font-size: 14px;
            color: var(--text);
            outline: none;
            width: 160px;
        }
        .search-box input::placeholder { color: var(--text-weak); }

        .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px;
            background: var(--primary);
            color: var(--text-inverse) !important;
            border: none;
            border-radius: 40px;
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: all var(--transition);
            text-decoration: none;
        }
        .btn-cta:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: var(--shadow-md); }
        .btn-cta:active { transform: translateY(0); }

        .menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            color: var(--text);
            cursor: pointer;
            padding: 4px 8px;
        }
        .menu-toggle:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

        /* === Article Hero === */
        .article-hero {
            position: relative;
            padding: 80px 0 60px;
            background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
            overflow: hidden;
        }
        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.15;
            mix-blend-mode: overlay;
        }
        .article-hero::after {
            content: '';
            position: absolute;
            top: -40%;
            right: -20%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(37,99,235,0.15) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .article-hero .container {
            position: relative;
            z-index: 1;
            text-align: center;
        }
        .article-hero .breadcrumb {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-size: 14px;
            color: rgba(255,255,255,0.6);
            margin-bottom: 20px;
        }
        .article-hero .breadcrumb a { color: rgba(255,255,255,0.7); }
        .article-hero .breadcrumb a:hover { color: #fff; }
        .article-hero .breadcrumb i { font-size: 12px; }
        .article-hero h1 {
            font-size: 40px;
            font-weight: 800;
            color: #fff;
            line-height: 1.25;
            max-width: 800px;
            margin: 0 auto 16px;
            letter-spacing: -0.5px;
        }
        .article-hero .meta {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 20px;
            color: rgba(255,255,255,0.7);
            font-size: 14px;
            flex-wrap: wrap;
        }
        .article-hero .meta span { display: flex; align-items: center; gap: 6px; }
        .article-hero .meta .tag {
            display: inline-block;
            padding: 2px 12px;
            background: rgba(255,255,255,0.12);
            border-radius: 40px;
            font-size: 13px;
            color: var(--accent);
        }

        /* === Article Content === */
        .article-main {
            padding: 60px 0 80px;
            background: var(--bg);
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 48px;
            align-items: start;
        }
        .article-body {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 40px 48px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
        }
        .article-body .content {
            font-size: 16px;
            line-height: 1.9;
            color: var(--text-medium);
        }
        .article-body .content p { margin-bottom: 20px; }
        .article-body .content h2 {
            font-size: 24px;
            font-weight: 700;
            color: var(--text);
            margin: 36px 0 16px;
            padding-bottom: 8px;
            border-bottom: 2px solid var(--primary-light);
        }
        .article-body .content h3 {
            font-size: 20px;
            font-weight: 600;
            color: var(--text);
            margin: 28px 0 12px;
        }
        .article-body .content ul, .article-body .content ol {
            margin: 0 0 20px 24px;
        }
        .article-body .content li { margin-bottom: 8px; }
        .article-body .content a { font-weight: 500; }
        .article-body .content blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-light);
            padding: 16px 24px;
            margin: 24px 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-medium);
        }
        .article-body .content img {
            margin: 24px 0;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
        }
        .article-body .content figure { margin: 24px 0; text-align: center; }
        .article-body .content figcaption { font-size: 13px; color: var(--text-weak); margin-top: 8px; }

        .article-footer-nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 40px;
            padding-top: 24px;
            border-top: 1px solid var(--border);
            flex-wrap: wrap;
            gap: 12px;
        }
        .article-footer-nav a {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 20px;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 500;
            color: var(--text-medium);
            transition: all var(--transition);
        }
        .article-footer-nav a:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }

        .article-not-found {
            text-align: center;
            padding: 80px 40px;
        }
        .article-not-found i { font-size: 64px; color: var(--text-weak); margin-bottom: 24px; }
        .article-not-found h2 { font-size: 28px; font-weight: 700; margin-bottom: 12px; }
        .article-not-found p { color: var(--text-weak); margin-bottom: 24px; }
        .article-not-found .btn-cta { display: inline-flex; }

        /* === Sidebar === */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 32px;
        }
        .sidebar-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 24px;
            box-shadow: var(--shadow-sm);
        }
        .sidebar-card h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 16px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--primary-light);
        }
        .sidebar-card ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
        .sidebar-card ul li a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 8px 12px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            color: var(--text-medium);
            transition: all var(--transition);
        }
        .sidebar-card ul li a:hover { background: var(--primary-light); color: var(--primary); }
        .sidebar-card ul li a i { color: var(--primary); font-size: 14px; width: 18px; text-align: center; }

        .sidebar-cta {
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            color: #fff;
            border: none;
            text-align: center;
            padding: 32px 24px;
        }
        .sidebar-cta h4 { font-size: 20px; font-weight: 700; margin-bottom: 8px; }
        .sidebar-cta p { font-size: 14px; opacity: 0.85; margin-bottom: 20px; }
        .sidebar-cta .btn-white {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 28px;
            background: #fff;
            color: var(--primary) !important;
            border-radius: 40px;
            font-weight: 600;
            font-size: 15px;
            transition: all var(--transition);
        }
        .sidebar-cta .btn-white:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.2); }

        /* === Footer === */
        .site-footer {
            background: #0f172a;
            color: rgba(255,255,255,0.7);
            padding: 60px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .footer-brand .logo { color: #fff; margin-bottom: 16px; }
        .footer-brand .logo i { color: var(--primary); }
        .footer-brand p { font-size: 14px; line-height: 1.7; margin-bottom: 20px; max-width: 360px; }
        .footer-social { display: flex; gap: 12px; }
        .footer-social a {
            display: flex; align-items: center; justify-content: center;
            width: 40px; height: 40px;
            background: rgba(255,255,255,0.06);
            border-radius: 50%;
            color: rgba(255,255,255,0.6);
            font-size: 18px;
            transition: all var(--transition);
        }
        .footer-social a:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }

        .footer-col h4 {
            font-size: 16px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 18px;
        }
        .footer-col a {
            display: block;
            font-size: 14px;
            color: rgba(255,255,255,0.6);
            padding: 5px 0;
            transition: all var(--transition);
        }
        .footer-col a:hover { color: var(--primary); padding-left: 4px; }

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 24px 0;
            font-size: 13px;
            color: rgba(255,255,255,0.4);
            flex-wrap: wrap;
            gap: 8px;
        }
        .footer-bottom a { color: rgba(255,255,255,0.5); }
        .footer-bottom a:hover { color: var(--primary); }

        /* === Responsive === */
        @media (max-width: 1024px) {
            .article-layout { grid-template-columns: 1fr; }
            .article-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
        }

        @media (max-width: 768px) {
            .site-header .container { padding: 0 16px; }
            .nav-list { display: none; }
            .menu-toggle { display: block; }
            .nav-list.open {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(255,255,255,0.98);
                backdrop-filter: blur(12px);
                border-bottom: 1px solid var(--border);
                padding: 16px 24px;
                gap: 4px;
                box-shadow: var(--shadow-lg);
            }
            .nav-list.open a { padding: 12px 16px; width: 100%; }
            .nav-list.open a.active::after { display: none; }
            .search-box input { width: 100px; }
            .btn-cta span { display: none; }

            .article-hero { padding: 48px 0 40px; }
            .article-hero h1 { font-size: 28px; }
            .article-body { padding: 24px 20px; }
            .article-body .content h2 { font-size: 20px; }
            .article-body .content h3 { font-size: 18px; }

            .article-sidebar { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }

        @media (max-width: 520px) {
            .article-hero h1 { font-size: 22px; }
            .article-hero .meta { gap: 12px; font-size: 13px; }
            .article-body { padding: 16px; }
            .article-body .content { font-size: 15px; }
            .article-footer-nav { flex-direction: column; align-items: stretch; }
            .header-actions .search-box { display: none; }
        }

        @media (min-width: 769px) {
            .menu-toggle { display: none !important; }
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
:root {
  --primary: #1a3a6b;
  --primary-light: #2a5a9b;
  --primary-dark: #0f2444;
  --secondary: #e8a838;
  --secondary-light: #f0c060;
  --accent: #3b82f6;
  --bg-body: #f8fafc;
  --bg-white: #ffffff;
  --bg-light: #f1f5f9;
  --bg-dark: #0f172a;
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-light: #f1f5f9;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
  --shadow-xl: 0 24px 60px rgba(0,0,0,0.18);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  --container-max: 1200px;
  --header-height: 72px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--bg-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-light); }
img { max-width: 100%; height: auto; display: block; }
button, input, select, textarea { font-family: inherit; font-size: inherit; }
button { cursor: pointer; border: none; background: none; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text-primary); }
h1 { font-size: 2.8rem; }
h2 { font-size: 2.2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.2rem; }
p { margin-bottom: 1rem; color: var(--text-secondary); }
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}
.section { padding: 80px 0; }
.section-header {
  text-align: center;
  margin-bottom: 48px;
}
.section-header h2 { margin-bottom: 12px; }
.section-header p { font-size: 1.1rem; max-width: 640px; margin: 0 auto; color: var(--text-secondary); }
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(26, 58, 107, 0.08);
  color: var(--primary);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 16px;
  letter-spacing: 0.3px;
}

/* ===== Header & Nav ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}
.site-header.scrolled { box-shadow: var(--shadow); }
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--primary);
  text-decoration: none;
  white-space: nowrap;
}
.logo i { font-size: 1.5rem; color: var(--secondary); }
.logo:hover { color: var(--primary); }
.logo span { letter-spacing: -0.3px; }
.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-list a {
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition);
  position: relative;
}
.nav-list a:hover { color: var(--primary); background: rgba(26,58,107,0.06); }
.nav-list a.active {
  color: var(--primary);
  background: rgba(26,58,107,0.10);
  font-weight: 600;
}
.nav-list a.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 3px;
  background: var(--secondary);
  border-radius: 4px;
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.header-actions .search-box {
  display: flex;
  align-items: center;
  background: var(--bg-light);
  border-radius: 50px;
  padding: 4px 4px 4px 16px;
  border: 1px solid var(--border);
  transition: all var(--transition);
}
.header-actions .search-box:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26,58,107,0.10);
  background: var(--bg-white);
}
.header-actions .search-box input {
  border: none;
  background: transparent;
  outline: none;
  padding: 8px 0;
  width: 140px;
  font-size: 0.9rem;
  color: var(--text-primary);
}
.header-actions .search-box input::placeholder { color: var(--text-muted); }
.header-actions .search-box button {
  background: var(--primary);
  color: #fff;
  border-radius: 50px;
  padding: 8px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: background var(--transition);
}
.header-actions .search-box button:hover { background: var(--primary-light); }
.btn-cta-nav {
  background: var(--secondary);
  color: var(--primary-dark);
  padding: 10px 24px;
  border-radius: 50px;
  font-weight: 700;
  font-size: 0.9rem;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn-cta-nav:hover { background: var(--secondary-light); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(232,168,56,0.35); }
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--bg-light);
  cursor: pointer;
  gap: 5px;
  transition: background var(--transition);
}
.mobile-toggle:hover { background: var(--border); }
.mobile-toggle span {
  display: block;
  width: 20px;
  height: 2.5px;
  background: var(--text-primary);
  border-radius: 4px;
  transition: all var(--transition);
}

/* ===== Hero ===== */
.page-hero {
  position: relative;
  padding: 140px 0 80px;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, var(--primary-light) 100%);
  overflow: hidden;
  min-height: 380px;
  display: flex;
  align-items: center;
}
.page-hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('/assets/images/backpic/back-1.png');
  background-size: cover;
  background-position: center;
  opacity: 0.18;
  z-index: 0;
}
.page-hero .container { position: relative; z-index: 1; }
.page-hero-content { max-width: 720px; }
.page-hero .breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: rgba(255,255,255,0.6);
  margin-bottom: 20px;
}
.page-hero .breadcrumb a { color: rgba(255,255,255,0.7); }
.page-hero .breadcrumb a:hover { color: #fff; }
.page-hero .breadcrumb i { font-size: 0.7rem; }
.page-hero h1 {
  color: #fff;
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
  line-height: 1.2;
}
.page-hero p {
  color: rgba(255,255,255,0.8);
  font-size: 1.15rem;
  max-width: 600px;
  margin-bottom: 28px;
  line-height: 1.7;
}
.page-hero .hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 12px;
}
.page-hero .hero-stats .stat-item {
  color: rgba(255,255,255,0.85);
  font-size: 0.95rem;
}
.page-hero .hero-stats .stat-item strong {
  display: block;
  font-size: 1.8rem;
  color: var(--secondary);
  font-weight: 800;
}

/* ===== Steps ===== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.step-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: all var(--transition);
  position: relative;
}
.step-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.step-number {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 1.3rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 18px;
  position: relative;
  z-index: 1;
}
.step-card:nth-child(1) .step-number { background: #1a3a6b; }
.step-card:nth-child(2) .step-number { background: #2a5a9b; }
.step-card:nth-child(3) .step-number { background: #3b7bcb; }
.step-card:nth-child(4) .step-number { background: var(--secondary); color: var(--primary-dark); }
.step-card h4 { font-size: 1.1rem; margin-bottom: 8px; }
.step-card p { font-size: 0.95rem; color: var(--text-secondary); margin-bottom: 0; }
.step-connector {
  display: none;
}

/* ===== Tutorial Cards ===== */
.tutorial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.tutorial-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: all var(--transition);
}
.tutorial-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.tutorial-card .card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
}
.tutorial-card .card-body { padding: 24px; }
.tutorial-card .card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}
.tutorial-card .card-tags span {
  background: rgba(26,58,107,0.08);
  color: var(--primary);
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
}
.tutorial-card h3 { font-size: 1.15rem; margin-bottom: 8px; }
.tutorial-card h3 a { color: var(--text-primary); }
.tutorial-card h3 a:hover { color: var(--primary); }
.tutorial-card p { font-size: 0.92rem; color: var(--text-secondary); margin-bottom: 16px; }
.tutorial-card .card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 12px;
  border-top: 1px solid var(--border-light);
  font-size: 0.85rem;
  color: var(--text-muted);
}
.tutorial-card .card-meta i { margin-right: 4px; }

/* ===== Tips ===== */
.tips-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.tip-item {
  display: flex;
  gap: 18px;
  background: var(--bg-white);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: all var(--transition);
}
.tip-item:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.tip-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: rgba(26,58,107,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--primary);
}
.tip-content h4 { font-size: 1.05rem; margin-bottom: 4px; }
.tip-content p { font-size: 0.92rem; color: var(--text-secondary); margin-bottom: 0; }

/* ===== Stats ===== */
.stats-section {
  background: var(--primary-dark);
  color: #fff;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}
.stat-block .stat-number {
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--secondary);
  line-height: 1.2;
  margin-bottom: 4px;
}
.stat-block .stat-label { font-size: 1rem; color: rgba(255,255,255,0.7); }
.stat-block .stat-desc { font-size: 0.85rem; color: rgba(255,255,255,0.5); margin-top: 4px; }

/* ===== FAQ ===== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-item {
  background: var(--bg-white);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: all var(--transition);
}
.faq-item:hover { border-color: var(--primary); box-shadow: var(--shadow-sm); }
.faq-question {
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
  transition: color var(--transition);
  user-select: none;
}
.faq-question:hover { color: var(--primary); }
.faq-question i {
  transition: transform var(--transition);
  color: var(--text-muted);
  font-size: 0.9rem;
}
.faq-item.active .faq-question i { transform: rotate(180deg); color: var(--primary); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  padding: 0 24px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}
.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 24px 20px;
}

/* ===== CTA ===== */
.cta-section {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  padding: 80px 0;
  text-align: center;
}
.cta-section h2 { color: #fff; font-size: 2.2rem; margin-bottom: 12px; }
.cta-section p { color: rgba(255,255,255,0.75); font-size: 1.1rem; max-width: 560px; margin: 0 auto 32px; }
.cta-buttons { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
.btn-primary, .btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 36px;
  border-radius: 50px;
  font-weight: 700;
  font-size: 1rem;
  transition: all var(--transition);
}
.btn-primary {
  background: var(--secondary);
  color: var(--primary-dark);
}
.btn-primary:hover { background: var(--secondary-light); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(232,168,56,0.35); }
.btn-secondary {
  background: rgba(255,255,255,0.12);
  color: #fff;
  border: 1.5px solid rgba(255,255,255,0.3);
}
.btn-secondary:hover { background: rgba(255,255,255,0.20); transform: translateY(-2px); }

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.7);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .logo { color: #fff; margin-bottom: 16px; }
.footer-brand .logo i { color: var(--secondary); }
.footer-brand p { font-size: 0.92rem; color: rgba(255,255,255,0.55); max-width: 320px; margin-bottom: 20px; }
.footer-social { display: flex; gap: 12px; }
.footer-social a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.6);
  transition: all var(--transition);
  font-size: 1.1rem;
}
.footer-social a:hover { background: var(--secondary); color: var(--primary-dark); transform: translateY(-2px); }
.footer-col h4 {
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 20px;
}
.footer-col a {
  display: block;
  color: rgba(255,255,255,0.55);
  font-size: 0.92rem;
  padding: 5px 0;
  transition: all var(--transition);
}
.footer-col a:hover { color: var(--secondary); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 24px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.4);
}
.footer-bottom a { color: rgba(255,255,255,0.5); }
.footer-bottom a:hover { color: var(--secondary); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .tutorial-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
}

@media (max-width: 768px) {
  :root { --header-height: 64px; }
  h1 { font-size: 2rem; }
  h2 { font-size: 1.7rem; }
  .section { padding: 56px 0; }
  .nav-list { display: none; }
  .header-actions .search-box { display: none; }
  .mobile-toggle { display: flex; }
  .nav-list.mobile-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(16px);
    padding: 16px 24px 24px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    gap: 4px;
  }
  .nav-list.mobile-open a { padding: 12px 16px; width: 100%; border-radius: var(--radius-sm); }
  .nav-list.mobile-open a.active::after { display: none; }
  .nav-list.mobile-open a.active { background: rgba(26,58,107,0.10); }
  .page-hero { padding: 110px 0 56px; min-height: auto; }
  .page-hero h1 { font-size: 2.2rem; }
  .page-hero p { font-size: 1rem; }
  .page-hero .hero-stats { flex-wrap: wrap; gap: 20px; }
  .page-hero .hero-stats .stat-item strong { font-size: 1.4rem; }
  .steps-grid { grid-template-columns: 1fr; gap: 16px; }
  .tutorial-grid { grid-template-columns: 1fr; }
  .tips-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .stat-block .stat-number { font-size: 2rem; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .cta-section h2 { font-size: 1.7rem; }
  .container { padding: 0 16px; }
  .section-header { margin-bottom: 32px; }
}

@media (max-width: 520px) {
  .page-hero h1 { font-size: 1.7rem; }
  .stats-grid { grid-template-columns: 1fr; gap: 16px; }
  .cta-buttons { flex-direction: column; align-items: center; }
  .btn-primary, .btn-secondary { width: 100%; max-width: 280px; justify-content: center; }
}