/* roulang page: index */
/* ===== Design Variables ===== */
:root {
  --primary: #0f2b4a;
  --primary-light: #1a4a7a;
  --primary-dark: #091e33;
  --accent: #e8453c;
  --accent-hover: #d13a32;
  --accent-light: #fde8e6;
  --bg: #f5f7fa;
  --bg-white: #ffffff;
  --bg-dark: #0f2b4a;
  --bg-section-alt: #eef1f5;
  --text: #1a2332;
  --text-light: #5a6a7e;
  --text-lighter: #8a9aaa;
  --text-white: #ffffff;
  --border: #e2e8f0;
  --border-light: #f0f2f5;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(15, 43, 74, 0.08);
  --shadow-hover: 0 12px 40px rgba(15, 43, 74, 0.14);
  --shadow-lg: 0 20px 56px rgba(15, 43, 74, 0.12);
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
  --max-width: 1200px;
  --header-height: 72px;
}
/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body { font-family: var(--font); color: var(--text); background: var(--bg); line-height: 1.6; font-size: 16px; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary-light); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent); }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }
button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
input, textarea { font-family: inherit; font-size: 1rem; border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 10px 16px; transition: border-color var(--transition); }
input:focus, textarea:focus { outline: none; border-color: var(--primary-light); box-shadow: 0 0 0 3px rgba(26, 74, 122, 0.1); }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 700; color: var(--primary); }
h1 { font-size: 2.75rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.1rem; }
p { margin-bottom: 1rem; color: var(--text-light); }
/* ===== Container ===== */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
/* ===== Header & Nav ===== */
.header { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: rgba(255,255,255,0.95); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); height: var(--header-height); transition: box-shadow var(--transition); }
.header.scrolled { box-shadow: var(--shadow); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: var(--header-height); gap: 16px; }
.logo { font-size: 1.4rem; font-weight: 800; color: var(--primary); letter-spacing: -0.5px; white-space: nowrap; display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.logo i { color: var(--accent); font-size: 1.3rem; }
.logo:hover { color: var(--primary); }
/* Search */
.search-wrap { flex: 1; max-width: 480px; margin: 0 16px; position: relative; }
.search-wrap .search-form { display: flex; align-items: center; background: var(--bg); border-radius: 40px; border: 1px solid var(--border); padding: 0 4px 0 16px; transition: all var(--transition); }
.search-wrap .search-form:focus-within { border-color: var(--primary-light); box-shadow: 0 0 0 3px rgba(26,74,122,0.08); background: var(--bg-white); }
.search-wrap .search-form input { flex: 1; border: none; background: transparent; padding: 9px 8px; font-size: 0.95rem; color: var(--text); }
.search-wrap .search-form input::placeholder { color: var(--text-lighter); }
.search-wrap .search-form button { background: var(--accent); color: #fff; border-radius: 40px; padding: 8px 20px; font-size: 0.9rem; font-weight: 600; display: flex; align-items: center; gap: 6px; transition: background var(--transition); }
.search-wrap .search-form button:hover { background: var(--accent-hover); }
.search-wrap .search-form button i { font-size: 0.9rem; }
/* Nav Links */
.nav-links { display: flex; align-items: center; gap: 6px; flex-shrink: 0; }
.nav-links a { padding: 8px 16px; border-radius: 40px; font-size: 0.9rem; font-weight: 500; color: var(--text); transition: all var(--transition); white-space: nowrap; }
.nav-links a:hover { background: var(--bg); color: var(--primary); }
.nav-links a.active { background: var(--primary); color: var(--text-white); }
.nav-links a.active:hover { background: var(--primary-light); }
/* Mobile Toggle */
.mobile-toggle { display: none; font-size: 1.4rem; color: var(--primary); padding: 6px 10px; border-radius: 8px; cursor: pointer; background: var(--bg); }
.mobile-toggle:hover { background: var(--border); }
/* ===== Hero ===== */
.hero { margin-top: var(--header-height); background: var(--primary-dark); position: relative; overflow: hidden; min-height: 92vh; display: flex; align-items: center; }
.hero-bg { position: absolute; inset: 0; background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat; opacity: 0.2; }
.hero-overlay { position: absolute; inset: 0; background: linear-gradient(135deg, rgba(15,43,74,0.92) 0%, rgba(15,43,74,0.7) 100%); }
.hero .container { position: relative; z-index: 2; padding: 80px 24px; text-align: center; }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; background: rgba(232,69,60,0.2); color: #fca5a0; padding: 6px 18px; border-radius: 40px; font-size: 0.85rem; font-weight: 500; margin-bottom: 24px; border: 1px solid rgba(232,69,60,0.25); }
.hero h1 { font-size: 3.2rem; font-weight: 800; color: var(--text-white); margin-bottom: 16px; letter-spacing: -0.5px; }
.hero h1 span { color: var(--accent); }
.hero p { font-size: 1.2rem; color: rgba(255,255,255,0.7); max-width: 640px; margin: 0 auto 32px; line-height: 1.7; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; justify-content: center; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 14px 32px; border-radius: 40px; font-weight: 600; font-size: 1rem; transition: all var(--transition); border: none; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(232,69,60,0.3); }
.btn-outline { background: transparent; color: var(--text-white); border: 2px solid rgba(255,255,255,0.3); }
.btn-outline:hover { border-color: var(--accent); color: var(--text-white); background: rgba(232,69,60,0.15); transform: translateY(-2px); }
.btn-lg { padding: 16px 40px; font-size: 1.1rem; }
.hero-stats { display: flex; justify-content: center; gap: 40px; margin-top: 48px; flex-wrap: wrap; }
.hero-stat { text-align: center; }
.hero-stat .num { font-size: 2rem; font-weight: 800; color: var(--text-white); }
.hero-stat .label { font-size: 0.85rem; color: rgba(255,255,255,0.55); margin-top: 4px; }
/* ===== Section ===== */
.section { padding: 80px 0; }
.section-alt { background: var(--bg-section-alt); }
.section-dark { background: var(--bg-dark); color: var(--text-white); }
.section-title { text-align: center; margin-bottom: 48px; }
.section-title h2 { margin-bottom: 12px; }
.section-title p { max-width: 560px; margin: 0 auto; color: var(--text-light); }
.section-dark .section-title h2 { color: var(--text-white); }
.section-dark .section-title p { color: rgba(255,255,255,0.6); }
/* ===== Card Grid ===== */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; }
.card { background: var(--bg-white); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; transition: all var(--transition); border: 1px solid var(--border-light); }
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.card-img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; display: block; }
.card-body { padding: 20px 24px 24px; }
.card-body h3 { margin-bottom: 8px; font-size: 1.15rem; }
.card-body p { font-size: 0.95rem; color: var(--text-light); margin-bottom: 12px; }
.card-tag { display: inline-block; background: var(--accent-light); color: var(--accent); font-size: 0.75rem; font-weight: 600; padding: 2px 12px; border-radius: 40px; margin-bottom: 10px; }
.card-link { font-weight: 600; color: var(--primary-light); display: inline-flex; align-items: center; gap: 6px; }
.card-link i { font-size: 0.8rem; transition: transform var(--transition); }
.card-link:hover i { transform: translateX(4px); }
/* ===== Features / Icon Cards ===== */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 24px; }
.feature-card { background: var(--bg-white); border-radius: var(--radius); padding: 32px 24px; text-align: center; box-shadow: var(--shadow); border: 1px solid var(--border-light); transition: all var(--transition); }
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.feature-card .icon { width: 64px; height: 64px; border-radius: 50%; background: var(--accent-light); color: var(--accent); display: flex; align-items: center; justify-content: center; font-size: 1.6rem; margin: 0 auto 16px; transition: background var(--transition), color var(--transition); }
.feature-card:hover .icon { background: var(--accent); color: #fff; }
.feature-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
.feature-card p { font-size: 0.9rem; margin-bottom: 0; }
/* ===== Steps / Flow ===== */
.steps { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 32px; counter-reset: step; }
.step { text-align: center; position: relative; }
.step::before { counter-increment: step; content: counter(step); position: absolute; top: -12px; left: 50%; transform: translateX(-50%); width: 40px; height: 40px; border-radius: 50%; background: var(--accent); color: #fff; font-weight: 800; font-size: 1.1rem; display: flex; align-items: center; justify-content: center; box-shadow: 0 4px 16px rgba(232,69,60,0.25); }
.step .icon { font-size: 2.4rem; color: var(--primary-light); margin-bottom: 12px; padding-top: 32px; }
.step h4 { margin-bottom: 6px; }
.step p { font-size: 0.9rem; margin-bottom: 0; }
/* ===== 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-sm); border: 1px solid var(--border); overflow: hidden; transition: all var(--transition); }
.faq-item summary { padding: 18px 24px; font-weight: 600; cursor: pointer; display: flex; justify-content: space-between; align-items: center; font-size: 1rem; color: var(--text); list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '\f107'; font-family: 'Font Awesome 6 Free'; font-weight: 900; transition: transform var(--transition); color: var(--text-light); }
.faq-item[open] summary::after { transform: rotate(180deg); }
.faq-item[open] { box-shadow: var(--shadow); }
.faq-item .faq-body { padding: 0 24px 18px; color: var(--text-light); font-size: 0.95rem; }
/* ===== CTA ===== */
.cta { background: var(--primary-dark); position: relative; overflow: hidden; }
.cta-bg { position: absolute; inset: 0; background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat; opacity: 0.1; }
.cta .container { position: relative; z-index: 2; text-align: center; padding: 80px 24px; }
.cta h2 { color: var(--text-white); font-size: 2.2rem; margin-bottom: 12px; }
.cta p { color: rgba(255,255,255,0.65); max-width: 520px; margin: 0 auto 32px; font-size: 1.05rem; }
/* ===== Post List (CMS) ===== */
.post-list { display: flex; flex-direction: column; gap: 16px; }
.post-item { background: var(--bg-white); border-radius: var(--radius-sm); padding: 20px 24px; border: 1px solid var(--border-light); transition: all var(--transition); display: flex; flex-wrap: wrap; gap: 12px 20px; align-items: flex-start; }
.post-item:hover { border-color: var(--border); box-shadow: var(--shadow); }
.post-item .post-cat { font-size: 0.75rem; font-weight: 600; color: var(--accent); background: var(--accent-light); padding: 2px 12px; border-radius: 40px; white-space: nowrap; }
.post-item .post-title { flex: 1; min-width: 200px; font-weight: 600; color: var(--text); font-size: 1rem; }
.post-item .post-title:hover { color: var(--accent); }
.post-item .post-meta { font-size: 0.85rem; color: var(--text-lighter); white-space: nowrap; display: flex; align-items: center; gap: 16px; }
.post-item .post-meta i { margin-right: 4px; }
.post-empty { text-align: center; padding: 40px; color: var(--text-lighter); font-size: 1rem; background: var(--bg-white); border-radius: var(--radius-sm); border: 1px dashed var(--border); }
/* ===== Category Page Specific ===== */
.cat-hero { margin-top: var(--header-height); background: var(--primary-dark); position: relative; overflow: hidden; padding: 60px 0; }
.cat-hero-bg { position: absolute; inset: 0; background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat; opacity: 0.15; }
.cat-hero .container { position: relative; z-index: 2; text-align: center; }
.cat-hero h1 { color: var(--text-white); font-size: 2.4rem; margin-bottom: 12px; }
.cat-hero p { color: rgba(255,255,255,0.65); max-width: 560px; margin: 0 auto; }
/* ===== Footer ===== */
.footer { background: var(--primary-dark); color: rgba(255,255,255,0.6); padding: 56px 0 32px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .logo { color: var(--text-white); margin-bottom: 12px; font-size: 1.3rem; }
.footer-brand p { font-size: 0.9rem; margin-bottom: 16px; color: rgba(255,255,255,0.5); max-width: 320px; }
.footer-social { display: flex; gap: 12px; }
.footer-social a { width: 40px; height: 40px; border-radius: 50%; background: rgba(255,255,255,0.08); color: rgba(255,255,255,0.6); display: flex; align-items: center; justify-content: center; font-size: 1rem; transition: all var(--transition); }
.footer-social a:hover { background: var(--accent); color: #fff; }
.footer h4 { color: var(--text-white); font-size: 1rem; margin-bottom: 16px; }
.footer ul li { margin-bottom: 10px; }
.footer ul a { color: rgba(255,255,255,0.5); font-size: 0.9rem; }
.footer ul a:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding-top: 24px; text-align: center; font-size: 0.85rem; color: rgba(255,255,255,0.35); }
/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .header-inner { gap: 8px; }
  .search-wrap { order: 3; flex: 0 1 100%; max-width: 100%; margin: 0 0 8px; }
  .search-wrap .search-form input { padding: 7px 8px; }
  .search-wrap .search-form button { padding: 6px 14px; font-size: 0.8rem; }
  .nav-links { display: none; }
  .nav-links.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); padding: 16px 24px; border-bottom: 1px solid var(--border); box-shadow: var(--shadow); gap: 4px; }
  .nav-links.open a { width: 100%; text-align: center; padding: 12px; }
  .mobile-toggle { display: block; }
  .hero { min-height: 70vh; }
  .hero h1 { font-size: 2rem; }
  .hero p { font-size: 1rem; }
  .hero-stats { gap: 24px; }
  .hero-stat .num { font-size: 1.5rem; }
  .section { padding: 56px 0; }
  .section-title { margin-bottom: 32px; }
  .section-title h2 { font-size: 1.6rem; }
  .card-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr 1fr; gap: 24px; }
  .cta .container { padding: 56px 24px; }
  .cta h2 { font-size: 1.6rem; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .post-item { flex-direction: column; gap: 6px; }
  .post-item .post-meta { white-space: normal; }
}
@media (max-width: 520px) {
  .hero h1 { font-size: 1.6rem; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .feature-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .hero-stats { flex-direction: column; gap: 16px; }
  .header-inner { flex-wrap: wrap; }
  .search-wrap { order: 3; flex: 1 1 100%; }
}

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a56db;
            --primary-dark: #1243af;
            --primary-light: #e8f0fe;
            --secondary: #f59e0b;
            --secondary-dark: #d97706;
            --accent: #10b981;
            --bg-body: #f8fafc;
            --bg-white: #ffffff;
            --bg-dark: #0f172a;
            --bg-card: #ffffff;
            --text-primary: #1e293b;
            --text-secondary: #64748b;
            --text-light: #94a3b8;
            --text-white: #f1f5f9;
            --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);
            --shadow-md: 0 6px 20px rgba(0,0,0,0.08);
            --shadow-lg: 0 16px 48px rgba(0,0,0,0.12);
            --shadow-xl: 0 24px 64px rgba(0,0,0,0.16);
            --spacing-xs: 4px;
            --spacing-sm: 8px;
            --spacing-md: 16px;
            --spacing-lg: 32px;
            --spacing-xl: 64px;
            --max-width: 1200px;
            --transition: 0.25s ease;
            --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body { font-family: var(--font-family); font-size: 16px; line-height: 1.7; color: var(--text-primary); background: var(--bg-body); }
        a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--primary-dark); }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-md); }
        button, input, textarea { font-family: inherit; font-size: 1rem; outline: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 700; color: var(--text-primary); }
        .container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--spacing-lg); }
        .container-narrow { max-width: 820px; margin: 0 auto; padding: 0 var(--spacing-lg); }

        /* ===== Header / Nav ===== */
        .header {
            position: sticky; top: 0; z-index: 100;
            background: rgba(255,255,255,0.92); backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
        }
        .header-inner {
            display: flex; align-items: center; justify-content: space-between;
            height: 68px; max-width: var(--max-width); margin: 0 auto; padding: 0 var(--spacing-lg);
        }
        .logo {
            display: flex; align-items: center; gap: 10px;
            font-size: 1.35rem; font-weight: 800; color: var(--primary); letter-spacing: -0.3px;
            white-space: nowrap;
        }
        .logo i { font-size: 1.5rem; color: var(--secondary); }
        .nav-links { display: flex; align-items: center; gap: var(--spacing-xs); }
        .nav-links 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-links a:hover { color: var(--primary); background: var(--primary-light); }
        .nav-links a.active { color: var(--primary); background: var(--primary-light); font-weight: 600; }
        .nav-links a.active::after {
            content: ''; position: absolute; bottom: -2px; left: 50%; transform: translateX(-50%);
            width: 20px; height: 3px; background: var(--primary); border-radius: 4px;
        }
        .nav-search {
            display: flex; align-items: center; background: var(--bg-body);
            border: 1px solid var(--border); border-radius: 40px;
            padding: 0 18px; height: 40px; transition: all var(--transition);
            min-width: 200px;
        }
        .nav-search:focus-within { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(26,86,219,0.12); }
        .nav-search i { color: var(--text-light); font-size: 0.9rem; margin-right: 8px; }
        .nav-search input {
            border: none; background: transparent; flex: 1;
            color: var(--text-primary); font-size: 0.9rem; padding: 4px 0;
        }
        .nav-search input::placeholder { color: var(--text-light); }
        .nav-toggle { display: none; background: none; border: none; font-size: 1.5rem; color: var(--text-primary); cursor: pointer; padding: 4px; }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            padding: var(--spacing-lg) 0 var(--spacing-md);
            font-size: 0.9rem; color: var(--text-light);
        }
        .breadcrumb a { color: var(--text-secondary); }
        .breadcrumb a:hover { color: var(--primary); }
        .breadcrumb span { color: var(--text-primary); font-weight: 500; }
        .breadcrumb .sep { margin: 0 8px; color: var(--text-light); }

        /* ===== Article Detail ===== */
        .article-detail {
            padding: var(--spacing-md) 0 var(--spacing-xl);
        }
        .article-header {
            margin-bottom: var(--spacing-lg);
            padding-bottom: var(--spacing-lg);
            border-bottom: 1px solid var(--border);
        }
        .article-category {
            display: inline-block; padding: 4px 16px; border-radius: 40px;
            background: var(--primary-light); color: var(--primary);
            font-size: 0.85rem; font-weight: 600; margin-bottom: var(--spacing-md);
        }
        .article-title {
            font-size: 2.2rem; font-weight: 800; line-height: 1.2;
            margin-bottom: var(--spacing-md); color: var(--text-primary);
            letter-spacing: -0.5px;
        }
        .article-meta {
            display: flex; flex-wrap: wrap; align-items: center; gap: var(--spacing-md);
            color: var(--text-light); font-size: 0.9rem;
        }
        .article-meta i { margin-right: 4px; }
        .article-meta span { display: inline-flex; align-items: center; }
        .article-body {
            font-size: 1.05rem; line-height: 1.9; color: var(--text-primary);
        }
        .article-body p { margin-bottom: 1.2em; }
        .article-body h2, .article-body h3, .article-body h4 {
            margin-top: 1.8em; margin-bottom: 0.6em; font-weight: 700;
        }
        .article-body h2 { font-size: 1.6rem; }
        .article-body h3 { font-size: 1.3rem; }
        .article-body ul, .article-body ol { margin-bottom: 1.2em; padding-left: 1.5em; }
        .article-body ul { list-style: disc; }
        .article-body ol { list-style: decimal; }
        .article-body li { margin-bottom: 0.4em; }
        .article-body a { color: var(--primary); text-decoration: underline; }
        .article-body a:hover { color: var(--primary-dark); }
        .article-body img { margin: 1.5em 0; border-radius: var(--radius-md); box-shadow: var(--shadow-md); }
        .article-body blockquote {
            border-left: 4px solid var(--primary); padding: var(--spacing-md) var(--spacing-lg);
            background: var(--primary-light); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            margin: 1.5em 0; color: var(--text-secondary);
        }
        .article-body code {
            background: var(--border-light); padding: 2px 8px; border-radius: 4px;
            font-size: 0.9em; font-family: 'JetBrains Mono', monospace;
        }
        .article-body pre {
            background: var(--bg-dark); color: var(--text-white); padding: var(--spacing-lg);
            border-radius: var(--radius-md); overflow-x: auto; margin: 1.5em 0;
            font-size: 0.9rem; line-height: 1.6;
        }
        .article-body pre code { background: transparent; padding: 0; color: inherit; }
        .article-body table { width: 100%; border-collapse: collapse; margin: 1.5em 0; }
        .article-body th, .article-body td {
            border: 1px solid var(--border); padding: 10px 14px; text-align: left;
        }
        .article-body th { background: var(--bg-body); font-weight: 600; }

        /* ===== Article Footer ===== */
        .article-footer {
            margin-top: var(--spacing-xl); padding-top: var(--spacing-lg);
            border-top: 1px solid var(--border);
            display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center;
            gap: var(--spacing-md);
        }
        .article-tags {
            display: flex; flex-wrap: wrap; gap: var(--spacing-sm);
        }
        .article-tags .tag {
            padding: 4px 14px; border-radius: 40px; background: var(--bg-body);
            border: 1px solid var(--border); font-size: 0.85rem; color: var(--text-secondary);
            transition: all var(--transition);
        }
        .article-tags .tag:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }
        .article-share {
            display: flex; align-items: center; gap: var(--spacing-sm);
        }
        .article-share span { color: var(--text-secondary); font-size: 0.9rem; }
        .article-share a {
            display: inline-flex; align-items: center; justify-content: center;
            width: 38px; height: 38px; border-radius: 50%;
            background: var(--bg-body); border: 1px solid var(--border);
            color: var(--text-secondary); transition: all var(--transition);
        }
        .article-share a:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

        /* ===== Related Posts ===== */
        .related-posts {
            padding: var(--spacing-xl) 0;
            background: var(--bg-white);
        }
        .related-posts h2 {
            font-size: 1.6rem; font-weight: 700; margin-bottom: var(--spacing-lg);
            text-align: center;
        }
        .related-grid {
            display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--spacing-lg);
        }
        .related-card {
            background: var(--bg-card); border: 1px solid var(--border);
            border-radius: var(--radius-md); overflow: hidden;
            transition: all var(--transition);
        }
        .related-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
        .related-card img { width: 100%; height: 180px; object-fit: cover; border-radius: 0; }
        .related-card-body { padding: var(--spacing-md) var(--spacing-lg); }
        .related-card-body h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 6px; }
        .related-card-body h3 a { color: var(--text-primary); }
        .related-card-body h3 a:hover { color: var(--primary); }
        .related-card-body .meta { color: var(--text-light); font-size: 0.85rem; }

        /* ===== CTA ===== */
        .cta-section {
            padding: var(--spacing-xl) 0;
            background: linear-gradient(135deg, var(--primary) 0%, #0f3b8c 100%);
            color: #fff; text-align: center;
        }
        .cta-section h2 { font-size: 2rem; font-weight: 700; color: #fff; margin-bottom: var(--spacing-md); }
        .cta-section p { font-size: 1.1rem; opacity: 0.9; max-width: 600px; margin: 0 auto var(--spacing-lg); }
        .cta-btn {
            display: inline-block; padding: 14px 40px; border-radius: 40px;
            background: var(--secondary); color: #fff; font-weight: 700; font-size: 1.1rem;
            border: none; cursor: pointer; transition: all var(--transition);
            box-shadow: 0 6px 24px rgba(245,158,11,0.4);
        }
        .cta-btn:hover { background: var(--secondary-dark); transform: translateY(-2px); box-shadow: 0 10px 32px rgba(245,158,11,0.5); color: #fff; }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-dark); color: var(--text-white); padding: var(--spacing-xl) 0 var(--spacing-lg);
        }
        .footer-grid {
            display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: var(--spacing-xl);
            padding-bottom: var(--spacing-lg); border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        .footer-brand .logo { color: #fff; margin-bottom: var(--spacing-md); }
        .footer-brand .logo i { color: var(--secondary); }
        .footer-brand p { color: var(--text-light); font-size: 0.9rem; line-height: 1.7; margin-bottom: var(--spacing-md); }
        .footer-social { display: flex; gap: var(--spacing-sm); }
        .footer-social a {
            display: inline-flex; align-items: center; justify-content: center;
            width: 40px; height: 40px; border-radius: 50%;
            background: rgba(255,255,255,0.08); color: var(--text-light);
            transition: all var(--transition);
        }
        .footer-social a:hover { background: var(--primary); color: #fff; }
        .footer h4 { color: #fff; font-size: 1rem; font-weight: 600; margin-bottom: var(--spacing-md); }
        .footer ul li { margin-bottom: 8px; }
        .footer ul a { color: var(--text-light); font-size: 0.9rem; transition: color var(--transition); }
        .footer ul a:hover { color: var(--secondary); }
        .footer-bottom {
            margin-top: var(--spacing-lg); text-align: center;
            color: var(--text-light); font-size: 0.85rem;
        }

        /* ===== Not Found ===== */
        .not-found-box {
            text-align: center; padding: var(--spacing-xl) 0;
        }
        .not-found-box i { font-size: 4rem; color: var(--text-light); margin-bottom: var(--spacing-md); }
        .not-found-box h2 { font-size: 1.8rem; margin-bottom: var(--spacing-md); }
        .not-found-box p { color: var(--text-secondary); margin-bottom: var(--spacing-lg); }
        .not-found-box a { color: var(--primary); font-weight: 600; }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--spacing-lg); }
            .related-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 768px) {
            .header-inner { padding: 0 var(--spacing-md); }
            .nav-links { display: none; position: absolute; top: 68px; left: 0; right: 0;
                background: rgba(255,255,255,0.98); backdrop-filter: blur(16px);
                flex-direction: column; padding: var(--spacing-md) var(--spacing-lg);
                border-bottom: 1px solid var(--border); box-shadow: var(--shadow-md);
                gap: var(--spacing-xs);
            }
            .nav-links.open { display: flex; }
            .nav-links a { padding: 12px 16px; width: 100%; border-radius: var(--radius-sm); }
            .nav-links a.active::after { display: none; }
            .nav-search { min-width: 140px; }
            .nav-toggle { display: block; }
            .article-title { font-size: 1.6rem; }
            .article-body { font-size: 1rem; }
            .related-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: var(--spacing-lg); }
            .cta-section h2 { font-size: 1.5rem; }
        }
        @media (max-width: 520px) {
            .container { padding: 0 var(--spacing-md); }
            .container-narrow { padding: 0 var(--spacing-md); }
            .header-inner { gap: var(--spacing-sm); }
            .logo { font-size: 1.1rem; }
            .logo i { font-size: 1.2rem; }
            .nav-search { min-width: 100px; padding: 0 12px; height: 36px; }
            .nav-search input { width: 70px; font-size: 0.85rem; }
            .article-title { font-size: 1.35rem; }
            .article-meta { flex-direction: column; align-items: flex-start; gap: var(--spacing-xs); }
            .article-footer { flex-direction: column; align-items: flex-start; }
            .cta-section { padding: var(--spacing-lg) 0; }
            .cta-section h2 { font-size: 1.3rem; }
            .cta-btn { padding: 12px 28px; font-size: 1rem; }
        }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a56db;
            --primary-dark: #1243af;
            --primary-light: #e8effd;
            --primary-gradient: linear-gradient(135deg, #1a56db 0%, #0f3b9e 100%);
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --bg-light: #f8fafc;
            --bg-white: #ffffff;
            --bg-dark: #0f172a;
            --bg-section-alt: #f1f5f9;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-light: #f1f5f9;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 16px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
            --transition: 0.25s ease;
            --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
            --container: 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-light);
            -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-dark);
        }
        a:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
            border-radius: 4px;
        }

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

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }

        button {
            cursor: pointer;
            border: none;
            background: none;
        }

        ul,
        ol {
            list-style: none;
        }

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

        /* ===== Header / Nav ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border);
            transition: box-shadow var(--transition);
        }
        .header.scrolled {
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--primary);
            white-space: nowrap;
        }
        .logo i {
            font-size: 1.5rem;
            color: var(--accent);
        }
        .logo a {
            color: inherit;
        }
        .logo a:hover {
            color: var(--primary-dark);
        }

        /* Search Bar (nav center) */
        .search-wrap {
            flex: 1;
            max-width: 480px;
            margin: 0 24px;
            position: relative;
        }
        .search-wrap .search-input {
            width: 100%;
            padding: 10px 44px 10px 18px;
            border: 1.5px solid var(--border);
            border-radius: 40px;
            background: var(--bg-light);
            font-size: 0.95rem;
            color: var(--text-primary);
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .search-wrap .search-input::placeholder {
            color: var(--text-muted);
        }
        .search-wrap .search-input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 4px rgba(26, 86, 219, 0.12);
            background: var(--bg-white);
        }
        .search-wrap .search-btn {
            position: absolute;
            right: 6px;
            top: 50%;
            transform: translateY(-50%);
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.95rem;
            transition: background var(--transition);
        }
        .search-wrap .search-btn:hover {
            background: var(--primary-dark);
        }

        /* Nav links */
        .nav-links {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-links a {
            padding: 8px 18px;
            border-radius: 40px;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: background var(--transition), color var(--transition);
            white-space: nowrap;
        }
        .nav-links a:hover {
            background: var(--primary-light);
            color: var(--primary);
        }
        .nav-links a.active {
            background: var(--primary);
            color: #fff;
        }
        .nav-links a.active:hover {
            background: var(--primary-dark);
            color: #fff;
        }

        /* Hamburger */
        .hamburger {
            display: none;
            flex-direction: column;
            justify-content: center;
            gap: 5px;
            width: 32px;
            height: 32px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 4px;
            z-index: 1100;
        }
        .hamburger span {
            display: block;
            height: 2.5px;
            background: var(--text-primary);
            border-radius: 4px;
            transition: transform var(--transition), opacity var(--transition);
        }
        .hamburger.active span:nth-child(1) {
            transform: translateY(7.5px) rotate(45deg);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: translateY(-7.5px) rotate(-45deg);
        }

        /* Mobile menu overlay */
        .mobile-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.4);
            z-index: 1050;
            opacity: 0;
            transition: opacity var(--transition);
            pointer-events: none;
        }
        .mobile-overlay.open {
            opacity: 1;
            pointer-events: auto;
        }

        /* ===== Page Banner ===== */
        .page-banner {
            margin-top: var(--header-height);
            padding: 100px 0 80px;
            background: var(--primary-gradient);
            position: relative;
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }
        .page-banner .bg-overlay {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            opacity: 0.15;
            mix-blend-mode: overlay;
        }
        .page-banner .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .page-banner h1 {
            font-size: 2.6rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: -0.02em;
            line-height: 1.2;
        }
        .page-banner p {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 680px;
            margin: 0 auto 28px;
            line-height: 1.7;
        }
        .page-banner .banner-tags {
            display: flex;
            justify-content: center;
            gap: 12px;
            flex-wrap: wrap;
        }
        .page-banner .banner-tags span {
            padding: 6px 18px;
            background: rgba(255, 255, 255, 0.18);
            border-radius: 40px;
            color: #fff;
            font-size: 0.9rem;
            font-weight: 500;
            backdrop-filter: blur(4px);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            padding: 18px 0 0;
            font-size: 0.9rem;
            color: var(--text-muted);
        }
        .breadcrumb .container {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--text-muted);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb .sep {
            color: var(--border);
        }
        .breadcrumb .current {
            color: var(--text-secondary);
            font-weight: 500;
        }

        /* ===== Section Shared ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--bg-section-alt);
        }
        .section-white {
            background: var(--bg-white);
        }
        .section-dark {
            background: var(--bg-dark);
            color: var(--text-light);
        }
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 12px;
            letter-spacing: -0.01em;
            line-height: 1.25;
            color: var(--text-primary);
        }
        .section-dark .section-title {
            color: #fff;
        }
        .section-sub {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 620px;
            margin-bottom: 44px;
            line-height: 1.6;
        }
        .section-dark .section-sub {
            color: rgba(255, 255, 255, 0.7);
        }
        .text-center {
            text-align: center;
        }
        .mx-auto {
            margin-left: auto;
            margin-right: auto;
        }

        /* ===== Card Grid ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .card {
            background: var(--bg-white);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .card .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
        }
        .card .card-body {
            padding: 24px 22px 26px;
        }
        .card .card-body h3 {
            font-size: 1.2rem;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--text-primary);
        }
        .card .card-body p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 14px;
        }
        .card .card-body .card-tag {
            display: inline-block;
            padding: 2px 14px;
            border-radius: 40px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 0.8rem;
            font-weight: 500;
        }
        .card .card-body .card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-weight: 600;
            color: var(--primary);
            font-size: 0.95rem;
            margin-top: 4px;
        }
        .card .card-body .card-link i {
            font-size: 0.8rem;
            transition: transform var(--transition);
        }
        .card .card-body .card-link:hover i {
            transform: translateX(4px);
        }

        /* ===== Steps ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .step-item {
            text-align: center;
            padding: 32px 18px;
            background: var(--bg-white);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .step-item:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow);
        }
        .step-item .step-num {
            width: 48px;
            height: 48px;
            margin: 0 auto 16px;
            border-radius: 50%;
            background: var(--primary-gradient);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            font-weight: 700;
        }
        .step-item h4 {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--text-primary);
        }
        .step-item p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ===== Platform Cards (featured) ===== */
        .platform-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .platform-card {
            background: var(--bg-white);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            padding: 36px 28px 30px;
            text-align: center;
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .platform-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
        }
        .platform-card .plat-icon {
            width: 72px;
            height: 72px;
            margin: 0 auto 18px;
            border-radius: 50%;
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2rem;
            color: var(--primary);
        }
        .platform-card h3 {
            font-size: 1.25rem;
            font-weight: 600;
            margin-bottom: 10px;
            color: var(--text-primary);
        }
        .platform-card p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 16px;
        }
        .platform-card .btn {
            display: inline-block;
            padding: 10px 30px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.95rem;
            background: var(--primary-gradient);
            color: #fff;
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .platform-card .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(26, 86, 219, 0.3);
        }

        /* ===== Feature List ===== */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .feature-item {
            display: flex;
            gap: 18px;
            padding: 24px 22px;
            background: var(--bg-white);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            transition: box-shadow var(--transition);
        }
        .feature-item:hover {
            box-shadow: var(--shadow);
        }
        .feature-item .fi-icon {
            flex-shrink: 0;
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--primary);
        }
        .feature-item h4 {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 4px;
        }
        .feature-item p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
        }
        .faq-item {
            border-bottom: 1px solid var(--border);
            padding: 18px 0;
        }
        .faq-item:first-child {
            border-top: 1px solid var(--border);
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1.05rem;
            color: var(--text-primary);
            padding: 4px 0;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
        }
        .faq-question i {
            color: var(--primary);
            font-size: 1.1rem;
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-question.open i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 24px 0 0;
        }
        .faq-answer.open {
            max-height: 300px;
            padding-top: 12px;
            padding-bottom: 4px;
        }
        .faq-answer p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 80px 0;
            background: var(--primary-gradient);
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section .bg-overlay {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-3.png');
            background-size: cover;
            background-position: center;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
        }
        .cta-section h2 {
            font-size: 2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }
        .cta-section p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 560px;
            margin: 0 auto 28px;
        }
        .cta-section .btn-cta {
            display: inline-block;
            padding: 14px 44px;
            border-radius: 40px;
            background: #fff;
            color: var(--primary);
            font-weight: 700;
            font-size: 1.05rem;
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .cta-section .btn-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
            color: var(--primary-dark);
        }

        /* ===== Footer ===== */
        .footer {
            background: #0f172a;
            color: rgba(255, 255, 255, 0.75);
            padding: 64px 0 0;
            font-size: 0.92rem;
        }
        .footer .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand .logo {
            font-size: 1.3rem;
            color: #fff;
            margin-bottom: 14px;
        }
        .footer-brand .logo i {
            color: var(--accent);
        }
        .footer-brand p {
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.7;
            margin-bottom: 18px;
            max-width: 340px;
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .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, 0.6);
            font-size: 1.1rem;
            transition: background var(--transition), color var(--transition);
        }
        .footer-social a:hover {
            background: var(--primary);
            color: #fff;
        }
        .footer h4 {
            font-size: 1rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
        }
        .footer ul li {
            margin-bottom: 10px;
        }
        .footer ul a {
            color: rgba(255, 255, 255, 0.6);
            transition: color var(--transition);
        }
        .footer ul a:hover {
            color: #fff;
        }
        .footer-bottom {
            padding: 24px 0;
            text-align: center;
            color: rgba(255, 255, 255, 0.45);
            font-size: 0.85rem;
        }

        /* ===== Buttons (通用) ===== */
        .btn {
            display: inline-block;
            padding: 12px 32px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
            border: none;
            cursor: pointer;
        }
        .btn-primary {
            background: var(--primary-gradient);
            color: #fff;
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(26, 86, 219, 0.3);
        }
        .btn-outline {
            background: transparent;
            border: 2px solid var(--primary);
            color: var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .card-grid,
            .platform-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .feature-grid {
                grid-template-columns: 1fr 1fr;
            }
            .page-banner h1 {
                font-size: 2.2rem;
            }
        }

        @media (max-width: 768px) {
            :root {
                --header-height: 64px;
            }
            .search-wrap {
                display: none;
            }
            .nav-links {
                position: fixed;
                top: 0;
                right: 0;
                width: 280px;
                height: 100vh;
                background: var(--bg-white);
                flex-direction: column;
                padding: 80px 28px 32px;
                gap: 6px;
                transform: translateX(100%);
                transition: transform var(--transition);
                box-shadow: -8px 0 30px rgba(0, 0, 0, 0.1);
                z-index: 1060;
                overflow-y: auto;
            }
            .nav-links.open {
                transform: translateX(0);
            }
            .nav-links a {
                padding: 12px 18px;
                width: 100%;
                border-radius: var(--radius-sm);
                font-size: 1rem;
            }
            .hamburger {
                display: flex;
            }
            .mobile-overlay.open {
                display: block;
            }

            .page-banner {
                padding: 70px 0 56px;
                min-height: 240px;
            }
            .page-banner h1 {
                font-size: 1.8rem;
            }
            .page-banner p {
                font-size: 1rem;
            }

            .section {
                padding: 56px 0;
            }
            .section-title {
                font-size: 1.6rem;
            }
            .card-grid,
            .platform-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .steps-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .feature-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-brand p {
                max-width: 100%;
            }

            .cta-section h2 {
                font-size: 1.6rem;
            }
            .cta-section p {
                font-size: 1rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .page-banner h1 {
                font-size: 1.5rem;
            }
            .page-banner .banner-tags span {
                font-size: 0.8rem;
                padding: 4px 14px;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .platform-card {
                padding: 28px 18px 24px;
            }
            .platform-card .plat-icon {
                width: 56px;
                height: 56px;
                font-size: 1.5rem;
            }
            .cta-section .btn-cta {
                padding: 12px 30px;
                font-size: 0.95rem;
            }
        }

        /* ===== Utilities ===== */
        .mb-8 {
            margin-bottom: 8px;
        }
        .mb-16 {
            margin-bottom: 16px;
        }
        .mb-24 {
            margin-bottom: 24px;
        }
        .mb-32 {
            margin-bottom: 32px;
        }
        .mb-44 {
            margin-bottom: 44px;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }