/* roulang page: index */
:root {
  --primary: #0a1628;
  --primary-light: #1a2a4a;
  --primary-dark: #050d1a;
  --accent: #2563eb;
  --accent-light: #3b82f6;
  --accent-gradient: linear-gradient(135deg, #2563eb, #06b6d4);
  --accent-gradient-hover: linear-gradient(135deg, #1d4ed8, #0891b2);
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --bg-dark: #0a1628;
  --bg-card: #ffffff;
  --text: #1e293b;
  --text-light: #64748b;
  --text-muted: #94a3b8;
  --text-white: #f8fafc;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 48px rgba(0,0,0,0.12);
  --shadow-accent: 0 4px 20px rgba(37,99,235,0.25);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --max-width: 1200px;
  --header-height: 76px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font); color: var(--text); background: var(--bg); line-height: 1.7; -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent-light); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button, input, textarea { font-family: inherit; font-size: inherit; outline: none; border: none; }
button { cursor: pointer; background: none; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; width: 100%; }
.section { padding: 96px 0; position: relative; }
.section-alt { background: var(--bg-alt); }
.section-dark { background: var(--bg-dark); color: var(--text-white); }
.section-title { font-size: 2.4rem; font-weight: 800; text-align: center; margin-bottom: 16px; letter-spacing: -0.02em; line-height: 1.2; color: var(--text); }
.section-dark .section-title { color: var(--text-white); }
.section-subtitle { font-size: 1.1rem; text-align: center; color: var(--text-light); max-width: 640px; margin: 0 auto 56px; line-height: 1.6; }
.section-dark .section-subtitle { color: var(--text-muted); }
.section-divider { width: 56px; height: 4px; background: var(--accent-gradient); border-radius: 4px; margin: 0 auto 24px; }

header { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: rgba(10,22,40,0.92); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); border-bottom: 1px solid rgba(255,255,255,0.06); height: var(--header-height); transition: var(--transition); }
header.scrolled { background: rgba(10,22,40,0.98); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: var(--header-height); max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.logo { font-size: 1.5rem; font-weight: 800; color: var(--text-white); letter-spacing: -0.02em; display: flex; align-items: center; gap: 10px; }
.logo i { color: var(--accent-light); font-size: 1.6rem; }
.logo:hover { color: var(--text-white); opacity: 0.9; }
.nav-desktop { display: flex; align-items: center; gap: 8px; }
.nav-desktop a { padding: 8px 18px; border-radius: var(--radius-xs); color: rgba(255,255,255,0.7); font-size: 0.95rem; font-weight: 500; transition: var(--transition); position: relative; }
.nav-desktop a:hover { color: var(--text-white); background: rgba(255,255,255,0.08); }
.nav-desktop a.active { color: var(--text-white); background: rgba(37,99,235,0.2); }
.nav-desktop a.active::after { content: ''; position: absolute; bottom: 2px; left: 50%; transform: translateX(-50%); width: 20px; height: 2px; background: var(--accent); border-radius: 2px; }
.nav-cta { background: var(--accent-gradient) !important; color: var(--text-white) !important; padding: 10px 24px !important; border-radius: var(--radius-xs) !important; font-weight: 600 !important; box-shadow: var(--shadow-accent); }
.nav-cta:hover { background: var(--accent-gradient-hover) !important; box-shadow: 0 6px 28px rgba(37,99,235,0.35) !important; transform: translateY(-1px); }
.nav-toggle { display: none; color: var(--text-white); font-size: 1.5rem; padding: 8px; background: none; border: none; cursor: pointer; }
.mobile-menu { display: none; position: fixed; top: var(--header-height); left: 0; right: 0; bottom: 0; background: rgba(10,22,40,0.98); backdrop-filter: blur(20px); z-index: 999; flex-direction: column; align-items: center; justify-content: flex-start; padding: 40px 24px; gap: 8px; overflow-y: auto; }
.mobile-menu.open { display: flex; }
.mobile-menu a { color: rgba(255,255,255,0.7); font-size: 1.2rem; padding: 14px 24px; width: 100%; text-align: center; border-radius: var(--radius-xs); font-weight: 500; }
.mobile-menu a:hover { color: var(--text-white); background: rgba(255,255,255,0.06); }
.mobile-menu a.active { color: var(--text-white); background: rgba(37,99,235,0.15); }
.mobile-menu .nav-cta { margin-top: 16px; }

.hero { padding: 140px 0 100px; position: relative; overflow: hidden; background: var(--bg-dark); min-height: 85vh; 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: 0.35; mix-blend-mode: overlay; }
.hero-bg-overlay { position: absolute; inset: 0; background: linear-gradient(135deg, rgba(10,22,40,0.92) 0%, rgba(10,22,40,0.6) 50%, rgba(10,22,40,0.92) 100%); }
.hero-particles { position: absolute; inset: 0; overflow: hidden; }
.hero-particle { position: absolute; width: 6px; height: 6px; background: rgba(37,99,235,0.3); border-radius: 50%; animation: float 20s infinite; }
@keyframes float { 0%,100% { transform: translateY(0) scale(1); } 50% { transform: translateY(-30px) scale(1.2); } }
.hero .container { position: relative; z-index: 2; text-align: center; }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; background: rgba(37,99,235,0.15); border: 1px solid rgba(37,99,235,0.25); color: var(--accent-light); padding: 8px 20px; border-radius: 100px; font-size: 0.85rem; font-weight: 600; margin-bottom: 32px; letter-spacing: 0.02em; }
.hero h1 { font-size: 3.8rem; font-weight: 800; color: var(--text-white); line-height: 1.1; margin-bottom: 24px; letter-spacing: -0.03em; }
.hero h1 span { background: var(--accent-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero p { font-size: 1.2rem; color: rgba(255,255,255,0.7); max-width: 600px; margin: 0 auto 40px; line-height: 1.7; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 10px; padding: 14px 32px; border-radius: var(--radius-xs); font-weight: 600; font-size: 1rem; transition: var(--transition); border: none; cursor: pointer; }
.btn-primary { background: var(--accent-gradient); color: var(--text-white); box-shadow: var(--shadow-accent); }
.btn-primary:hover { background: var(--accent-gradient-hover); box-shadow: 0 8px 32px rgba(37,99,235,0.4); transform: translateY(-2px); color: var(--text-white); }
.btn-outline { background: transparent; color: var(--text-white); border: 1.5px solid rgba(255,255,255,0.2); }
.btn-outline:hover { border-color: var(--accent); background: rgba(37,99,235,0.1); color: var(--text-white); transform: translateY(-2px); }
.btn-sm { padding: 10px 22px; font-size: 0.9rem; }
.hero-stats { display: flex; justify-content: center; gap: 48px; margin-top: 56px; flex-wrap: wrap; }
.hero-stat { text-align: center; }
.hero-stat-number { font-size: 2.4rem; font-weight: 800; color: var(--text-white); letter-spacing: -0.02em; }
.hero-stat-label { font-size: 0.9rem; color: rgba(255,255,255,0.5); margin-top: 4px; }

.features-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.feature-card { background: var(--bg-card); border-radius: var(--radius); padding: 36px 28px; border: 1px solid var(--border); transition: var(--transition); text-align: center; box-shadow: var(--shadow-sm); }
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--accent); }
.feature-icon { width: 64px; height: 64px; border-radius: 16px; background: var(--bg-alt); display: flex; align-items: center; justify-content: center; margin: 0 auto 20px; font-size: 1.8rem; color: var(--accent); transition: var(--transition); }
.feature-card:hover .feature-icon { background: var(--accent-gradient); color: #fff; }
.feature-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 10px; color: var(--text); }
.feature-card p { font-size: 0.95rem; color: var(--text-light); line-height: 1.6; }

.category-showcase { background: var(--bg-alt); }
.category-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; align-items: center; }
.category-image { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-lg); position: relative; }
.category-image img { width: 100%; height: 420px; object-fit: cover; transition: var(--transition); }
.category-image:hover img { transform: scale(1.03); }
.category-content h2 { font-size: 2rem; font-weight: 800; margin-bottom: 16px; line-height: 1.2; }
.category-content p { color: var(--text-light); font-size: 1.05rem; line-height: 1.7; margin-bottom: 24px; }
.category-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 28px; }
.tag { display: inline-flex; align-items: center; gap: 6px; background: var(--bg-alt); border: 1px solid var(--border); padding: 6px 16px; border-radius: 100px; font-size: 0.85rem; color: var(--text-light); transition: var(--transition); }
.tag:hover { background: var(--accent); color: #fff; border-color: var(--accent); }
.tag i { font-size: 0.75rem; }

.stats-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.stat-card { text-align: center; padding: 40px 24px; background: rgba(255,255,255,0.04); border-radius: var(--radius); border: 1px solid rgba(255,255,255,0.06); transition: var(--transition); }
.stat-card:hover { background: rgba(255,255,255,0.08); transform: translateY(-4px); }
.stat-card-icon { font-size: 2.4rem; color: var(--accent-light); margin-bottom: 16px; }
.stat-card-number { font-size: 3rem; font-weight: 800; color: var(--text-white); letter-spacing: -0.02em; }
.stat-card-label { font-size: 1rem; color: var(--text-muted); margin-top: 6px; }

.news-section { background: var(--bg-alt); }
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.news-card { background: var(--bg-card); border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); transition: var(--transition); box-shadow: var(--shadow-sm); }
.news-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--accent); }
.news-card-image { height: 200px; overflow: hidden; position: relative; }
.news-card-image img { width: 100%; height: 100%; object-fit: cover; transition: var(--transition); }
.news-card:hover .news-card-image img { transform: scale(1.06); }
.news-card-cat { position: absolute; top: 12px; left: 12px; background: var(--accent); color: #fff; padding: 4px 14px; border-radius: 100px; font-size: 0.75rem; font-weight: 600; }
.news-card-body { padding: 24px; }
.news-card-body h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 10px; line-height: 1.4; color: var(--text); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-card-body p { font-size: 0.9rem; color: var(--text-light); line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin-bottom: 16px; }
.news-card-meta { display: flex; align-items: center; gap: 16px; font-size: 0.8rem; color: var(--text-muted); }
.news-card-meta i { margin-right: 4px; }
.news-empty { grid-column: 1 / -1; text-align: center; padding: 60px 20px; color: var(--text-light); font-size: 1.1rem; background: var(--bg-card); border-radius: var(--radius); border: 1px dashed var(--border); }

.flow-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; counter-reset: step; }
.flow-step { text-align: center; position: relative; padding: 36px 20px; background: var(--bg-card); border-radius: var(--radius); border: 1px solid var(--border); transition: var(--transition); }
.flow-step:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.flow-step::before { counter-increment: step; content: counter(step); position: absolute; top: -14px; left: 50%; transform: translateX(-50%); width: 32px; height: 32px; background: var(--accent-gradient); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 0.9rem; box-shadow: var(--shadow-accent); }
.flow-step-icon { font-size: 2.2rem; color: var(--accent); margin-bottom: 16px; margin-top: 8px; }
.flow-step h4 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
.flow-step p { font-size: 0.9rem; color: var(--text-light); line-height: 1.5; }

.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-sm); border: 1px solid var(--border); overflow: hidden; transition: var(--transition); }
.faq-item:hover { border-color: var(--accent); }
.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); background: none; width: 100%; text-align: left; transition: var(--transition); }
.faq-question:hover { color: var(--accent); }
.faq-question i { transition: var(--transition); color: var(--text-light); font-size: 0.9rem; }
.faq-item.open .faq-question i { transform: rotate(180deg); color: var(--accent); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.4s ease; padding: 0 24px; }
.faq-item.open .faq-answer { max-height: 300px; padding: 0 24px 20px; }
.faq-answer p { color: var(--text-light); font-size: 0.95rem; line-height: 1.7; }

.cta-section { text-align: center; padding: 100px 0; background: var(--bg-dark); position: relative; overflow: hidden; }
.cta-section::before { content: ''; position: absolute; inset: 0; background: url('/assets/images/backpic/back-2.png') center center/cover no-repeat; opacity: 0.15; mix-blend-mode: overlay; }
.cta-section .container { position: relative; z-index: 2; }
.cta-section h2 { font-size: 2.8rem; font-weight: 800; color: var(--text-white); margin-bottom: 16px; }
.cta-section p { font-size: 1.15rem; color: rgba(255,255,255,0.7); max-width: 560px; margin: 0 auto 32px; }
.cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

footer { background: var(--primary-dark); color: rgba(255,255,255,0.6); padding: 64px 0 32px; border-top: 1px solid rgba(255,255,255,0.05); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 48px; }
.footer-brand .logo { font-size: 1.4rem; margin-bottom: 16px; display: inline-flex; }
.footer-brand p { font-size: 0.9rem; line-height: 1.7; max-width: 320px; color: rgba(255,255,255,0.5); }
.footer-col h4 { font-size: 1rem; font-weight: 700; color: var(--text-white); margin-bottom: 20px; }
.footer-col a { display: block; color: rgba(255,255,255,0.5); font-size: 0.9rem; padding: 6px 0; transition: var(--transition); }
.footer-col a:hover { color: var(--accent-light); padding-left: 4px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.06); padding-top: 24px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; font-size: 0.85rem; color: rgba(255,255,255,0.4); }
.footer-socials { display: flex; gap: 12px; }
.footer-socials a { width: 40px; height: 40px; border-radius: 50%; background: rgba(255,255,255,0.06); display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,0.5); transition: var(--transition); font-size: 1rem; }
.footer-socials a:hover { background: var(--accent); color: #fff; transform: translateY(-2px); }

@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .news-grid { grid-template-columns: repeat(2, 1fr); }
  .flow-steps { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .hero h1 { font-size: 2.8rem; }
}

@media (max-width: 768px) {
  .nav-desktop { display: none; }
  .nav-toggle { display: block; }
  .hero { padding: 120px 0 80px; min-height: auto; }
  .hero h1 { font-size: 2.2rem; }
  .hero p { font-size: 1rem; }
  .hero-stats { gap: 24px; }
  .hero-stat-number { font-size: 1.8rem; }
  .section { padding: 64px 0; }
  .section-title { font-size: 1.8rem; }
  .features-grid { grid-template-columns: 1fr; }
  .category-grid { grid-template-columns: 1fr; }
  .category-image img { height: 280px; }
  .news-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: 1fr; gap: 16px; }
  .flow-steps { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .cta-section h2 { font-size: 2rem; }
  .hero-actions { flex-direction: column; align-items: center; }
  .btn { width: 100%; max-width: 300px; justify-content: center; }
}

@media (max-width: 520px) {
  .hero h1 { font-size: 1.8rem; }
  .section-title { font-size: 1.5rem; }
  .container { padding: 0 16px; }
  .hero-stats { flex-direction: column; gap: 16px; }
  .stat-card-number { font-size: 2.2rem; }
}

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #3b82f6;
            --primary-soft: #eff6ff;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --bg-body: #f8fafc;
            --bg-white: #ffffff;
            --bg-card: #ffffff;
            --bg-dark: #0f172a;
            --bg-dark-soft: #1e293b;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-light: #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), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 32px rgba(0,0,0,0.12);
            --shadow-xl: 0 24px 48px rgba(0,0,0,0.18);
            --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, 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-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;
        }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--primary-dark); }
        a:focus-visible { outline: 3px solid var(--primary-light); outline-offset: 2px; border-radius: 2px; }
        button, input, textarea, select { font-family: inherit; font-size: inherit; }
        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 24px; width: 100%; }

        /* ===== Header & Navigation ===== */
        #header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
            box-shadow: 0 1px 4px rgba(0,0,0,0.04);
            height: var(--header-height);
            transition: var(--transition);
        }
        #header .header-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        #header .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.3px;
            transition: var(--transition);
        }
        #header .logo i { color: var(--primary); font-size: 1.6rem; }
        #header .logo:hover { opacity: 0.8; color: var(--primary); }
        .nav-desktop { display: flex; align-items: center; gap: 8px; }
        .nav-desktop a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 0.95rem;
            transition: var(--transition);
            position: relative;
        }
        .nav-desktop a:hover { color: var(--primary); background: var(--primary-soft); }
        .nav-desktop a.active { color: var(--primary); background: var(--primary-soft); font-weight: 600; }
        .nav-desktop a.nav-cta {
            background: var(--primary);
            color: #fff;
            padding: 8px 22px;
            border-radius: var(--radius-md);
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 6px;
            box-shadow: 0 4px 10px rgba(37,99,235,0.25);
        }
        .nav-desktop a.nav-cta:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 6px 16px rgba(37,99,235,0.35); }
        .nav-toggle { display: none; background: none; border: none; font-size: 1.5rem; color: var(--text-primary); cursor: pointer; padding: 8px 12px; border-radius: var(--radius-sm); transition: var(--transition); }
        .nav-toggle:hover { background: var(--border-light); }
        .mobile-menu {
            display: none;
            position: absolute;
            top: var(--header-height);
            left: 0;
            right: 0;
            background: var(--bg-white);
            border-bottom: 1px solid var(--border);
            padding: 16px 24px;
            box-shadow: var(--shadow-lg);
            flex-direction: column;
            gap: 6px;
        }
        .mobile-menu.open { display: flex; }
        .mobile-menu a {
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            color: var(--text-secondary);
            font-weight: 500;
            transition: var(--transition);
        }
        .mobile-menu a:hover { background: var(--primary-soft); color: var(--primary); }
        .mobile-menu a.active { background: var(--primary-soft); color: var(--primary); font-weight: 600; }
        .mobile-menu a.nav-cta { background: var(--primary); color: #fff; text-align: center; margin-top: 8px; border-radius: var(--radius-md); }
        .mobile-menu a.nav-cta:hover { background: var(--primary-dark); }

        /* ===== Article Hero ===== */
        .article-hero {
            position: relative;
            padding: 80px 0 60px;
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            min-height: 320px;
            display: flex;
            align-items: center;
            overflow: hidden;
        }
        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,23,42,0.85) 0%, rgba(30,41,59,0.7) 100%);
            z-index: 1;
        }
        .article-hero .container { position: relative; z-index: 2; }
        .article-hero .hero-breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            color: rgba(255,255,255,0.65);
            margin-bottom: 20px;
        }
        .article-hero .hero-breadcrumb a { color: rgba(255,255,255,0.8); }
        .article-hero .hero-breadcrumb a:hover { color: #fff; }
        .article-hero .hero-breadcrumb span { color: rgba(255,255,255,0.5); }
        .article-hero .hero-category {
            display: inline-block;
            background: var(--primary);
            color: #fff;
            padding: 4px 16px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.3px;
            margin-bottom: 16px;
        }
        .article-hero h1 {
            font-size: 2.6rem;
            font-weight: 800;
            color: #fff;
            max-width: 800px;
            line-height: 1.2;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .article-hero .hero-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 18px;
            color: rgba(255,255,255,0.7);
            font-size: 0.9rem;
        }
        .article-hero .hero-meta i { margin-right: 6px; color: var(--accent); }
        .article-hero .hero-meta span { display: flex; align-items: center; }

        /* ===== Article Content ===== */
        .article-section { padding: 60px 0; }
        .article-section .article-body {
            max-width: 820px;
            margin: 0 auto;
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            padding: 48px 56px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
        }
        .article-section .article-body h2 { font-size: 1.8rem; margin-top: 36px; margin-bottom: 16px; color: var(--text-primary); }
        .article-section .article-body h3 { font-size: 1.4rem; margin-top: 28px; margin-bottom: 12px; }
        .article-section .article-body p { margin-bottom: 18px; color: var(--text-secondary); font-size: 1.05rem; line-height: 1.8; }
        .article-section .article-body ul, .article-section .article-body ol { margin-bottom: 18px; padding-left: 24px; list-style: disc; color: var(--text-secondary); }
        .article-section .article-body li { margin-bottom: 8px; }
        .article-section .article-body img { border-radius: var(--radius-md); margin: 24px 0; width: 100%; object-fit: cover; }
        .article-section .article-body blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-soft);
            padding: 18px 24px;
            margin: 24px 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
            font-style: italic;
        }
        .article-section .article-body a { color: var(--primary); text-decoration: underline; }
        .article-section .article-body a:hover { color: var(--primary-dark); }

        /* ===== Article Tags & Share ===== */
        .article-tags-section { padding: 0 0 60px; }
        .article-tags-section .tags-wrap {
            max-width: 820px;
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 12px;
            justify-content: space-between;
            background: var(--bg-white);
            padding: 24px 32px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
        }
        .article-tags-section .tags-left { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
        .article-tags-section .tags-left i { color: var(--primary); font-size: 1.1rem; margin-right: 4px; }
        .article-tags-section .tag {
            display: inline-block;
            background: var(--primary-soft);
            color: var(--primary);
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 500;
            transition: var(--transition);
        }
        .article-tags-section .tag:hover { background: var(--primary); color: #fff; }
        .article-tags-section .share-right { display: flex; gap: 10px; align-items: center; }
        .article-tags-section .share-right span { font-size: 0.9rem; color: var(--text-muted); }
        .article-tags-section .share-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: var(--border-light);
            color: var(--text-secondary);
            transition: var(--transition);
            font-size: 1rem;
        }
        .article-tags-section .share-btn:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }

        /* ===== Related Posts ===== */
        .related-section { padding: 60px 0; background: var(--bg-white); border-top: 1px solid var(--border); }
        .related-section .section-title {
            text-align: center;
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 40px;
            color: var(--text-primary);
        }
        .related-section .section-title i { color: var(--primary); margin-right: 10px; }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--bg-body);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border);
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .related-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--primary-light); }
        .related-card .card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-radius: 0;
        }
        .related-card .card-body { padding: 18px 20px 20px; }
        .related-card .card-body h4 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--text-primary);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-body p {
            font-size: 0.85rem;
            color: var(--text-muted);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 10px;
        }
        .related-card .card-body .meta { font-size: 0.75rem; color: var(--text-muted); display: flex; align-items: center; gap: 12px; }
        .related-card .card-body .meta i { margin-right: 4px; }

        /* ===== CTA Section ===== */
        .cta-section { padding: 70px 0; background: var(--bg-dark); background-image: url('/assets/images/backpic/back-3.png'); background-size: cover; background-position: center; background-blend-mode: overlay; position: relative; }
        .cta-section::before { content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(15,23,42,0.88) 0%, rgba(30,41,59,0.8) 100%); z-index: 1; }
        .cta-section .container { position: relative; z-index: 2; text-align: center; }
        .cta-section h2 { font-size: 2.2rem; font-weight: 700; color: #fff; margin-bottom: 16px; }
        .cta-section p { color: rgba(255,255,255,0.7); max-width: 600px; margin: 0 auto 32px; font-size: 1.05rem; }
        .cta-section .cta-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
        .cta-section .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--primary);
            color: #fff;
            padding: 14px 32px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 1rem;
            transition: var(--transition);
            box-shadow: 0 6px 18px rgba(37,99,235,0.35);
        }
        .cta-section .btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 10px 28px rgba(37,99,235,0.45); color: #fff; }
        .cta-section .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            color: #fff;
            padding: 14px 32px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 1rem;
            border: 2px solid rgba(255,255,255,0.3);
            transition: var(--transition);
        }
        .cta-section .btn-outline:hover { border-color: #fff; background: rgba(255,255,255,0.08); color: #fff; transform: translateY(-2px); }

        /* ===== Footer ===== */
        footer {
            background: var(--bg-dark);
            color: rgba(255,255,255,0.75);
            padding: 60px 0 0;
            border-top: 1px solid rgba(255,255,255,0.06);
        }
        footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255,255,255,0.06);
        }
        footer .footer-brand .logo { display: flex; align-items: center; gap: 10px; font-size: 1.3rem; font-weight: 800; color: #fff; margin-bottom: 16px; }
        footer .footer-brand .logo i { color: var(--primary); }
        footer .footer-brand p { font-size: 0.9rem; line-height: 1.7; color: rgba(255,255,255,0.6); max-width: 360px; }
        footer .footer-col h4 { font-size: 1rem; font-weight: 600; color: #fff; margin-bottom: 18px; }
        footer .footer-col a {
            display: block;
            color: rgba(255,255,255,0.6);
            padding: 6px 0;
            font-size: 0.9rem;
            transition: var(--transition);
        }
        footer .footer-col a:hover { color: var(--primary-light); padding-left: 4px; }
        footer .footer-col a i { width: 20px; margin-right: 6px; color: var(--primary-light); }
        footer .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 24px 0;
            flex-wrap: wrap;
            gap: 16px;
        }
        footer .footer-bottom span { font-size: 0.85rem; color: rgba(255,255,255,0.45); }
        footer .footer-socials { display: flex; gap: 14px; }
        footer .footer-socials 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: rgba(255,255,255,0.6);
            font-size: 1.1rem;
            transition: var(--transition);
        }
        footer .footer-socials a:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }

        /* ===== Not Found ===== */
        .not-found-section { padding: 80px 0; text-align: center; min-height: 400px; display: flex; align-items: center; justify-content: center; }
        .not-found-section .not-found-box { max-width: 500px; }
        .not-found-section i { font-size: 4rem; color: var(--text-muted); margin-bottom: 24px; display: block; }
        .not-found-section h2 { font-size: 1.8rem; margin-bottom: 12px; }
        .not-found-section p { color: var(--text-secondary); margin-bottom: 24px; }
        .not-found-section .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--primary);
            color: #fff;
            padding: 12px 28px;
            border-radius: var(--radius-md);
            font-weight: 600;
            transition: var(--transition);
        }
        .not-found-section .btn-back:hover { background: var(--primary-dark); transform: translateY(-2px); color: #fff; }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .related-grid { grid-template-columns: repeat(2, 1fr); }
            footer .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .article-hero h1 { font-size: 2.2rem; }
        }
        @media (max-width: 768px) {
            .nav-desktop { display: none; }
            .nav-toggle { display: block; }
            .article-hero { padding: 60px 0 40px; min-height: 260px; }
            .article-hero h1 { font-size: 1.8rem; }
            .article-section .article-body { padding: 28px 24px; border-radius: var(--radius-md); }
            .article-section .article-body h2 { font-size: 1.5rem; }
            .article-tags-section .tags-wrap { flex-direction: column; align-items: flex-start; gap: 16px; padding: 20px 24px; }
            .related-grid { grid-template-columns: 1fr; gap: 16px; }
            .cta-section h2 { font-size: 1.6rem; }
            footer .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            footer .footer-bottom { flex-direction: column; text-align: center; }
            .container { padding: 0 16px; }
        }
        @media (max-width: 520px) {
            .article-hero h1 { font-size: 1.4rem; }
            .article-section .article-body { padding: 20px 16px; }
            .article-section .article-body p { font-size: 0.95rem; }
            .cta-section .cta-btns { flex-direction: column; align-items: center; }
            .cta-section .btn-primary, .cta-section .btn-outline { width: 100%; justify-content: center; }
        }

        /* ===== Print ===== */
        @media print {
            #header, footer, .cta-section, .related-section, .article-tags-section { display: none; }
            .article-hero { background: #fff !important; padding: 20px 0; min-height: auto; }
            .article-hero::before { display: none; }
            .article-hero h1 { color: #000; }
            .article-hero .hero-meta { color: #666; }
            .article-section .article-body { box-shadow: none; border: none; padding: 0; }
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #3b82f6;
            --primary-bg: #eff6ff;
            --secondary: #7c3aed;
            --secondary-light: #a78bfa;
            --accent: #f59e0b;
            --accent-light: #fbbf24;
            --bg: #ffffff;
            --bg-alt: #f8fafc;
            --bg-card: #ffffff;
            --text: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.1);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --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;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            min-height: 100vh;
            padding-top: var(--header-height);
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: 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;
            border-radius: var(--radius-sm);
        }
        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.25;
            color: var(--text);
        }
        p {
            margin-bottom: 0;
            color: var(--text-secondary);
        }

        /* ===== Container ===== */
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ===== Header / Navigation ===== */
        #header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
            height: var(--header-height);
            transition: var(--transition);
        }
        #header:hover {
            background: rgba(255, 255, 255, 0.98);
        }
        .header-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text) !important;
            letter-spacing: -0.5px;
            flex-shrink: 0;
        }
        .logo i {
            color: var(--primary);
            font-size: 1.6rem;
        }
        .logo:hover {
            color: var(--primary) !important;
        }

        .nav-desktop {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-desktop a {
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-secondary);
            transition: var(--transition);
            position: relative;
        }
        .nav-desktop a:hover {
            color: var(--primary);
            background: var(--primary-bg);
        }
        .nav-desktop a.active {
            color: var(--primary);
            background: var(--primary-bg);
            font-weight: 600;
        }
        .nav-desktop a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 16px;
            right: 16px;
            height: 3px;
            background: var(--primary);
            border-radius: 2px;
        }
        .nav-desktop a.nav-cta {
            background: var(--primary);
            color: #fff !important;
            padding: 8px 22px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            gap: 6px;
            margin-left: 8px;
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
        }
        .nav-desktop a.nav-cta:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(37, 99, 235, 0.35);
        }
        .nav-desktop a.nav-cta i {
            font-size: 0.8rem;
        }

        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.6rem;
            color: var(--text);
            cursor: pointer;
            padding: 6px 10px;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .nav-toggle:hover {
            background: var(--bg-alt);
        }

        .mobile-menu {
            display: none;
            flex-direction: column;
            background: var(--bg);
            border-top: 1px solid var(--border);
            padding: 12px 24px 20px;
            gap: 6px;
            box-shadow: var(--shadow-md);
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
        }
        .mobile-menu.open {
            max-height: 400px;
            padding: 12px 24px 20px;
        }
        .mobile-menu a {
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            color: var(--text-secondary);
            transition: var(--transition);
        }
        .mobile-menu a:hover {
            background: var(--bg-alt);
            color: var(--primary);
        }
        .mobile-menu a.active {
            color: var(--primary);
            background: var(--primary-bg);
            font-weight: 600;
        }
        .mobile-menu a.nav-cta {
            background: var(--primary);
            color: #fff !important;
            border-radius: 50px;
            text-align: center;
            margin-top: 6px;
        }
        .mobile-menu a.nav-cta:hover {
            background: var(--primary-dark);
        }

        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }
            .nav-toggle {
                display: block;
            }
            .mobile-menu {
                display: flex;
            }
            .header-inner {
                padding: 0 16px;
            }
        }
        @media (min-width: 769px) {
            .mobile-menu {
                display: none !important;
            }
        }

        /* ===== Hero / Banner ===== */
        .hero-banner {
            position: relative;
            min-height: 420px;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 80px 24px 60px;
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
            overflow: hidden;
        }
        .hero-banner .hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            opacity: 0.3;
            z-index: 0;
        }
        .hero-banner .hero-overlay {
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at center, rgba(37, 99, 235, 0.15) 0%, transparent 70%);
            z-index: 1;
        }
        .hero-banner .container {
            position: relative;
            z-index: 2;
        }
        .hero-banner h1 {
            font-size: 3.2rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: -1px;
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
        }
        .hero-banner p {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 680px;
            margin: 0 auto 28px;
            line-height: 1.7;
        }
        .hero-banner .hero-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
        }
        .hero-banner .hero-tags span {
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(4px);
            border: 1px solid rgba(255, 255, 255, 0.15);
            padding: 6px 18px;
            border-radius: 50px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.9);
            font-weight: 500;
        }
        .hero-banner .hero-tags span i {
            margin-right: 6px;
            color: var(--accent-light);
        }
        @media (max-width: 768px) {
            .hero-banner {
                min-height: 320px;
                padding: 60px 16px 50px;
            }
            .hero-banner h1 {
                font-size: 2rem;
            }
            .hero-banner p {
                font-size: 1rem;
            }
        }
        @media (max-width: 520px) {
            .hero-banner h1 {
                font-size: 1.7rem;
            }
            .hero-banner p {
                font-size: 0.95rem;
            }
        }

        /* ===== Section通用 ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--bg-alt);
        }
        .section-title {
            font-size: 2.2rem;
            font-weight: 800;
            text-align: center;
            margin-bottom: 12px;
            letter-spacing: -0.5px;
        }
        .section-subtitle {
            text-align: center;
            color: var(--text-muted);
            font-size: 1.05rem;
            max-width: 620px;
            margin: 0 auto 48px;
            line-height: 1.7;
        }
        @media (max-width: 768px) {
            .section {
                padding: 56px 0;
            }
            .section-title {
                font-size: 1.7rem;
            }
            .section-subtitle {
                font-size: 0.95rem;
                margin-bottom: 32px;
            }
        }

        /* ===== 平台简介 ===== */
        .intro-grid {
            display: flex;
            align-items: center;
            gap: 60px;
        }
        .intro-grid .intro-text {
            flex: 1;
        }
        .intro-grid .intro-text h2 {
            font-size: 2rem;
            margin-bottom: 16px;
        }
        .intro-grid .intro-text p {
            font-size: 1.05rem;
            line-height: 1.8;
            margin-bottom: 16px;
        }
        .intro-grid .intro-text .intro-list {
            margin-top: 20px;
        }
        .intro-grid .intro-text .intro-list li {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 8px 0;
            font-size: 1rem;
            color: var(--text-secondary);
        }
        .intro-grid .intro-text .intro-list li i {
            color: var(--primary);
            font-size: 1.2rem;
            width: 24px;
            text-align: center;
        }
        .intro-grid .intro-image {
            flex: 1;
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
        }
        .intro-grid .intro-image img {
            width: 100%;
            height: auto;
            display: block;
        }
        @media (max-width: 900px) {
            .intro-grid {
                flex-direction: column;
                gap: 32px;
            }
            .intro-grid .intro-text h2 {
                font-size: 1.6rem;
            }
        }
        @media (max-width: 520px) {
            .intro-grid .intro-text h2 {
                font-size: 1.4rem;
            }
            .intro-grid .intro-text p {
                font-size: 0.95rem;
            }
        }

        /* ===== 核心功能卡片 ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 32px 28px 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: var(--transition);
            text-align: center;
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary-bg);
        }
        .feature-card .fc-icon {
            width: 64px;
            height: 64px;
            border-radius: 16px;
            background: var(--primary-bg);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 1.8rem;
            color: var(--primary);
            transition: var(--transition);
        }
        .feature-card:hover .fc-icon {
            background: var(--primary);
            color: #fff;
            transform: scale(1.05);
        }
        .feature-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .feature-card p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        @media (max-width: 900px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 520px) {
            .features-grid {
                grid-template-columns: 1fr;
            }
            .feature-card {
                padding: 24px 20px;
            }
        }

        /* ===== 使用流程 ===== */
        .steps-grid {
            display: flex;
            gap: 24px;
            flex-wrap: wrap;
            justify-content: center;
            counter-reset: step-counter;
        }
        .step-item {
            flex: 1;
            min-width: 200px;
            max-width: 260px;
            text-align: center;
            position: relative;
            padding: 32px 20px 24px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .step-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .step-item .step-number {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            font-weight: 700;
            margin: 0 auto 16px;
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
        }
        .step-item h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .step-item p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        .step-item .step-icon {
            font-size: 1.6rem;
            color: var(--primary-light);
            margin-bottom: 10px;
        }
        @media (max-width: 768px) {
            .steps-grid {
                gap: 16px;
            }
            .step-item {
                min-width: 160px;
                max-width: 220px;
                padding: 24px 16px;
            }
        }
        @media (max-width: 520px) {
            .steps-grid {
                flex-direction: column;
                align-items: center;
            }
            .step-item {
                max-width: 100%;
                width: 100%;
            }
        }

        /* ===== 热门推荐卡片 ===== */
        .recommend-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .rec-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .rec-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary-bg);
        }
        .rec-card .rec-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-radius: 0;
        }
        .rec-card .rec-body {
            padding: 20px 22px 24px;
        }
        .rec-card .rec-body h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .rec-card .rec-body p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 14px;
        }
        .rec-card .rec-body .rec-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 0.85rem;
            color: var(--text-muted);
        }
        .rec-card .rec-body .rec-meta i {
            margin-right: 4px;
        }
        .rec-card .rec-body .rec-tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 0.78rem;
            font-weight: 600;
            color: var(--primary);
            background: var(--primary-bg);
            margin-bottom: 10px;
        }
        @media (max-width: 900px) {
            .recommend-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 520px) {
            .recommend-grid {
                grid-template-columns: 1fr;
            }
            .rec-card .rec-img {
                height: 170px;
            }
        }

        /* ===== FAQ / 手风琴 ===== */
        .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-sm);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary-bg);
            box-shadow: var(--shadow-sm);
        }
        .faq-item .faq-q {
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            transition: var(--transition);
            user-select: none;
        }
        .faq-item .faq-q:hover {
            color: var(--primary);
        }
        .faq-item .faq-q i {
            color: var(--primary);
            font-size: 1.1rem;
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-q i {
            transform: rotate(180deg);
        }
        .faq-item .faq-a {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.open .faq-a {
            max-height: 300px;
            padding: 0 24px 20px;
        }
        @media (max-width: 520px) {
            .faq-item .faq-q {
                padding: 14px 16px;
                font-size: 0.95rem;
            }
            .faq-item .faq-a {
                padding: 0 16px;
                font-size: 0.9rem;
            }
            .faq-item.open .faq-a {
                padding: 0 16px 16px;
            }
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
            padding: 72px 24px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(37, 99, 235, 0.15) 0%, transparent 60%);
            pointer-events: none;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
        }
        .cta-section h2 {
            font-size: 2.2rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
        }
        .cta-section p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.75);
            max-width: 560px;
            margin: 0 auto 28px;
        }
        .cta-section .cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: var(--primary);
            color: #fff;
            padding: 14px 36px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1.05rem;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 4px 20px rgba(37, 99, 235, 0.35);
        }
        .cta-section .cta-btn:hover {
            background: var(--primary-dark);
            transform: translateY(-3px);
            box-shadow: 0 8px 30px rgba(37, 99, 235, 0.5);
        }
        .cta-section .cta-btn i {
            font-size: 0.95rem;
        }
        @media (max-width: 768px) {
            .cta-section {
                padding: 52px 16px;
            }
            .cta-section h2 {
                font-size: 1.7rem;
            }
            .cta-section p {
                font-size: 0.95rem;
            }
        }

        /* ===== Footer ===== */
        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 !important;
            font-size: 1.3rem;
            margin-bottom: 14px;
        }
        .footer-brand .logo i {
            color: var(--primary-light);
        }
        .footer-brand p {
            font-size: 0.92rem;
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 1rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-col a {
            display: block;
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9rem;
            padding: 5px 0;
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: var(--primary-light);
            padding-left: 4px;
        }
        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 24px 0;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.4);
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-socials {
            display: flex;
            gap: 14px;
        }
        .footer-socials a {
            color: rgba(255, 255, 255, 0.5);
            font-size: 1.2rem;
            transition: var(--transition);
        }
        .footer-socials a:hover {
            color: var(--primary-light);
            transform: scale(1.1);
        }
        @media (max-width: 900px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ===== Utility ===== */
        .text-center {
            text-align: center;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mb-16 {
            margin-bottom: 16px;
        }
        .mb-24 {
            margin-bottom: 24px;
        }

        /* 响应式辅助 */
        @media (max-width: 768px) {
            .hide-mobile {
                display: none !important;
            }
        }
        @media (min-width: 769px) {
            .hide-desktop {
                display: none !important;
            }
        }

        /* 图片圆角与阴影 */
        .img-radius {
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-md);
        }