/* roulang page: index */
:root {
  --primary: #4F46E5;
  --primary-dark: #4338CA;
  --primary-light: #EEF2FF;
  --primary-gradient: linear-gradient(135deg, #4F46E5 0%, #7C3AED 100%);
  --secondary: #10B981;
  --secondary-light: #D1FAE5;
  --accent: #F59E0B;
  --accent-light: #FEF3C7;
  --bg: #FFFFFF;
  --bg-alt: #F9FAFB;
  --bg-card: #FFFFFF;
  --text: #111827;
  --text-light: #6B7280;
  --text-white: #FFFFFF;
  --border: #E5E7EB;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-hover: 0 8px 32px rgba(0,0,0,0.14);
  --shadow-lg: 0 12px 48px rgba(0,0,0,0.12);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  --container: 1200px;
  --header-h: 72px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body { font-family: var(--font-base); font-size: 16px; line-height: 1.7; color: var(--text); background: var(--bg); }
img { max-width: 100%; height: auto; display: block; }
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; }
button, input, textarea { font-family: inherit; font-size: 1rem; }
button { cursor: pointer; border: none; background: none; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 700; color: var(--text); }
h1 { font-size: 2.75rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.375rem; }
h4 { font-size: 1.125rem; }
p { margin-bottom: 1rem; }
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section-alt { background: var(--bg-alt); }
.section-title { text-align: center; margin-bottom: 16px; }
.section-title h2 { position: relative; display: inline-block; }
.section-title h2::after { content: ''; display: block; width: 60px; height: 4px; background: var(--primary-gradient); border-radius: 2px; margin: 12px auto 0; }
.section-subtitle { text-align: center; color: var(--text-light); font-size: 1.1rem; max-width: 640px; margin: 0 auto 48px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 28px; border-radius: var(--radius-sm); font-weight: 600; font-size: 1rem; transition: all var(--transition); border: 2px solid transparent; }
.btn-primary { background: var(--primary-gradient); color: var(--text-white); border-color: transparent; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(79,70,229,0.35); color: #fff; }
.btn-primary:active { transform: translateY(0); }
.btn-outline { background: transparent; color: var(--primary); border-color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: var(--text-white); transform: translateY(-2px); }
.btn-outline:active { transform: translateY(0); }
.btn-lg { padding: 16px 36px; font-size: 1.125rem; border-radius: var(--radius); }
.card { background: var(--bg-card); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; transition: all var(--transition); }
.card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }
.badge { display: inline-block; padding: 4px 14px; border-radius: 20px; font-size: 0.8rem; font-weight: 500; background: var(--primary-light); color: var(--primary); }
.badge-green { background: var(--secondary-light); color: #047857; }
.badge-yellow { background: var(--accent-light); color: #B45309; }
.tag { display: inline-block; padding: 2px 12px; border-radius: 4px; font-size: 0.75rem; font-weight: 500; background: var(--bg-alt); color: var(--text-light); border: 1px solid var(--border); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.text-center { text-align: center; }
.mt-1 { margin-top: 16px; }
.mt-2 { margin-top: 32px; }
.mb-1 { margin-bottom: 16px; }
.mb-2 { margin-bottom: 32px; }

/* Header */
.header { position: fixed; top: 0; left: 0; right: 0; height: var(--header-h); background: rgba(255,255,255,0.95); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); z-index: 1000; transition: box-shadow var(--transition); }
.header.scrolled { box-shadow: 0 4px 20px rgba(0,0,0,0.06); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 100%; }
.logo { font-size: 1.5rem; font-weight: 800; background: var(--primary-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; letter-spacing: -0.5px; }
.logo:hover { opacity: 0.85; }
.nav { display: flex; align-items: center; gap: 8px; }
.nav a { padding: 8px 18px; border-radius: var(--radius-sm); font-weight: 500; color: var(--text); position: relative; transition: all var(--transition); }
.nav a:hover { background: var(--primary-light); color: var(--primary); }
.nav a.active { background: var(--primary); color: var(--text-white); }
.nav a.active:hover { background: var(--primary-dark); }
.nav-cta { margin-left: 12px; }
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
.hamburger span { display: block; width: 26px; height: 2.5px; background: var(--text); border-radius: 2px; transition: all var(--transition); }
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Hero */
.hero { position: relative; min-height: 92vh; display: flex; align-items: center; padding-top: var(--header-h); background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat; }
.hero::before { content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(15,23,42,0.75) 0%, rgba(30,27,75,0.6) 100%); }
.hero-content { position: relative; z-index: 2; max-width: 720px; }
.hero h1 { font-size: 3.25rem; color: var(--text-white); margin-bottom: 20px; line-height: 1.15; }
.hero p { font-size: 1.2rem; color: rgba(255,255,255,0.85); margin-bottom: 36px; max-width: 580px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero .btn-primary { background: var(--text-white); color: var(--primary); border-color: var(--text-white); }
.hero .btn-primary:hover { background: var(--primary); color: var(--text-white); border-color: var(--primary); box-shadow: 0 8px 24px rgba(0,0,0,0.25); }
.hero .btn-outline { color: var(--text-white); border-color: rgba(255,255,255,0.5); }
.hero .btn-outline:hover { background: rgba(255,255,255,0.15); border-color: #fff; color: #fff; }
.hero-badge { display: inline-block; padding: 6px 20px; border-radius: 20px; font-size: 0.85rem; font-weight: 500; background: rgba(255,255,255,0.15); color: rgba(255,255,255,0.9); margin-bottom: 24px; backdrop-filter: blur(4px); }

/* Features */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.feature-card { text-align: center; padding: 40px 28px; }
.feature-icon { width: 64px; height: 64px; border-radius: 50%; display: flex; align-items: center; justify-content: center; margin: 0 auto 20px; font-size: 1.75rem; background: var(--primary-light); color: var(--primary); }
.feature-card h3 { margin-bottom: 12px; }
.feature-card p { color: var(--text-light); font-size: 0.95rem; margin-bottom: 0; }

/* Category Entry */
.category-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.category-card { position: relative; border-radius: var(--radius); overflow: hidden; height: 260px; display: flex; align-items: flex-end; padding: 32px; background: url('/assets/images/coverpic/cover-2.png') center center / cover no-repeat; }
.category-card::before { content: ''; position: absolute; inset: 0; background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 60%); }
.category-card-content { position: relative; z-index: 2; width: 100%; }
.category-card h3 { color: #fff; font-size: 1.5rem; margin-bottom: 6px; }
.category-card p { color: rgba(255,255,255,0.8); font-size: 0.95rem; margin-bottom: 0; }
.category-card .badge { background: rgba(255,255,255,0.2); color: #fff; backdrop-filter: blur(4px); margin-bottom: 12px; }
.category-card:hover { transform: scale(1.02); box-shadow: var(--shadow-lg); }

/* Latest Posts */
.posts-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.post-card { display: flex; flex-direction: column; }
.post-card-img { width: 100%; height: 200px; object-fit: cover; }
.post-card-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.post-card-body .badge { align-self: flex-start; margin-bottom: 12px; }
.post-card-body h3 { font-size: 1.15rem; margin-bottom: 8px; flex: 1; }
.post-card-body h3 a { color: var(--text); }
.post-card-body h3 a:hover { color: var(--primary); }
.post-card-body .meta { font-size: 0.85rem; color: var(--text-light); display: flex; align-items: center; gap: 12px; margin-top: 12px; }
.post-card-body .excerpt { color: var(--text-light); font-size: 0.9rem; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin-bottom: 12px; }
.empty-state { grid-column: 1 / -1; text-align: center; padding: 60px 20px; color: var(--text-light); font-size: 1.1rem; background: var(--bg-alt); border-radius: var(--radius); }

/* Stats */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; }
.stat-card { text-align: center; padding: 36px 20px; }
.stat-number { font-size: 2.5rem; font-weight: 800; background: var(--primary-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; line-height: 1.2; }
.stat-label { color: var(--text-light); font-size: 0.95rem; margin-top: 8px; }

/* FAQ */
.faq-list { max-width: 780px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
.faq-item { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; transition: all var(--transition); }
.faq-item:hover { border-color: var(--primary); }
.faq-question { padding: 20px 24px; font-weight: 600; font-size: 1.05rem; cursor: pointer; display: flex; justify-content: space-between; align-items: center; background: var(--bg); transition: background var(--transition); }
.faq-question:hover { background: var(--bg-alt); }
.faq-question::after { content: '+'; font-size: 1.5rem; font-weight: 300; color: var(--text-light); transition: transform var(--transition); }
.faq-item.active .faq-question::after { transform: rotate(45deg); color: var(--primary); }
.faq-answer { padding: 0 24px; max-height: 0; overflow: hidden; transition: all var(--transition); color: var(--text-light); font-size: 0.95rem; }
.faq-item.active .faq-answer { padding: 0 24px 20px; max-height: 300px; }

/* CTA */
.cta-section { background: var(--primary-gradient); padding: 80px 0; text-align: center; }
.cta-section h2 { color: var(--text-white); margin-bottom: 16px; }
.cta-section p { color: rgba(255,255,255,0.85); max-width: 560px; margin: 0 auto 32px; font-size: 1.1rem; }
.cta-section .btn-primary { background: var(--text-white); color: var(--primary); }
.cta-section .btn-primary:hover { background: rgba(255,255,255,0.9); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.2); }

/* Footer */
.footer { background: #0F172A; color: rgba(255,255,255,0.7); padding: 60px 0 32px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
.footer-brand .logo { font-size: 1.5rem; margin-bottom: 16px; display: inline-block; }
.footer-brand p { font-size: 0.9rem; max-width: 320px; }
.footer h4 { color: #fff; font-size: 1rem; margin-bottom: 20px; font-weight: 600; }
.footer ul li { margin-bottom: 10px; }
.footer ul a { color: rgba(255,255,255,0.6); font-size: 0.9rem; transition: color var(--transition); }
.footer ul a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 24px; margin-top: 48px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; font-size: 0.85rem; }
.footer-bottom a { color: rgba(255,255,255,0.6); }
.footer-bottom a:hover { color: #fff; }

/* Responsive */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .hero h1 { font-size: 2.75rem; }
}
@media (max-width: 768px) {
  .hamburger { display: flex; }
  .nav { position: fixed; top: var(--header-h); left: 0; right: 0; background: rgba(255,255,255,0.98); backdrop-filter: blur(12px); flex-direction: column; padding: 20px 24px; border-bottom: 1px solid var(--border); transform: translateY(-120%); opacity: 0; transition: all var(--transition); pointer-events: none; }
  .nav.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav a { width: 100%; padding: 12px 16px; }
  .nav-cta { margin-left: 0; margin-top: 8px; width: 100%; }
  .nav-cta .btn { width: 100%; text-align: center; }
  .hero h1 { font-size: 2.25rem; }
  .hero p { font-size: 1rem; }
  .features-grid, .grid-3, .posts-grid { grid-template-columns: 1fr; }
  .grid-2, .category-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .section { padding: 56px 0; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}
@media (max-width: 520px) {
  .hero h1 { font-size: 1.75rem; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; text-align: center; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
  .stat-number { font-size: 2rem; }
  .container { padding: 0 16px; }
  .section-title h2 { font-size: 1.5rem; }
}

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #dbeafe;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --accent-light: #fef3c7;
            --bg: #ffffff;
            --bg-alt: #f8fafc;
            --bg-dark: #0f172a;
            --text: #1e293b;
            --text-light: #64748b;
            --text-white: #f1f5f9;
            --border: #e2e8f0;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
            --shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.10);
            --shadow-hover: 0 8px 32px rgba(37, 99, 235, 0.12);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --max-width: 1200px;
            --header-h: 72px;
            --spacing: 64px;
            --spacing-sm: 40px;
            --spacing-xs: 24px;
        }

        /* ===== 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);
            color: var(--text);
            background: var(--bg);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover,
        a:focus-visible {
            color: var(--primary-dark);
        }
        a:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
            border-radius: 4px;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text);
        }
        h1 {
            font-size: 2.8rem;
        }
        h2 {
            font-size: 2rem;
            margin-bottom: 0.5em;
        }
        h3 {
            font-size: 1.3rem;
        }
        h4 {
            font-size: 1.1rem;
        }
        p {
            margin-bottom: 1em;
            color: var(--text-light);
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .section {
            padding: var(--spacing) 0;
        }
        .section-alt {
            background: var(--bg-alt);
        }
        .section-dark {
            background: var(--bg-dark);
            color: var(--text-white);
        }
        .section-dark h2,
        .section-dark h3,
        .section-dark h4 {
            color: #fff;
        }
        .section-dark p {
            color: #cbd5e1;
        }
        .text-center {
            text-align: center;
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            border: 0;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            font-weight: 600;
            font-size: 1rem;
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            border: 2px solid transparent;
            text-align: center;
            justify-content: center;
            line-height: 1.4;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff !important;
            border-color: var(--primary);
        }
        .btn-primary:hover,
        .btn-primary:focus-visible {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.30);
        }
        .btn-accent {
            background: var(--accent);
            color: #fff !important;
            border-color: var(--accent);
        }
        .btn-accent:hover,
        .btn-accent:focus-visible {
            background: var(--accent-dark);
            border-color: var(--accent-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(245, 158, 11, 0.30);
        }
        .btn-outline {
            background: transparent;
            color: var(--primary) !important;
            border-color: var(--primary);
        }
        .btn-outline:hover,
        .btn-outline:focus-visible {
            background: var(--primary);
            color: #fff !important;
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 8px 20px;
            font-size: 0.9rem;
        }
        .btn-lg {
            padding: 16px 36px;
            font-size: 1.1rem;
        }
        .btn:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }

        /* ===== Badge / Tag ===== */
        .badge {
            display: inline-block;
            padding: 4px 14px;
            font-size: 0.8rem;
            font-weight: 600;
            border-radius: 50px;
            background: var(--primary-light);
            color: var(--primary);
            letter-spacing: 0.3px;
        }
        .badge-accent {
            background: var(--accent-light);
            color: var(--accent-dark);
        }
        .badge-green {
            background: #dcfce7;
            color: #16a34a;
        }

        /* ===== Header / Nav ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
            height: var(--header-h);
            transition: box-shadow var(--transition);
        }
        .header.scrolled {
            box-shadow: 0 4px 32px rgba(0, 0, 0, 0.06);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            font-size: 1.5rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.5px;
            white-space: nowrap;
        }
        .logo a {
            color: inherit;
            background: inherit;
            -webkit-background-clip: inherit;
            background-clip: inherit;
            -webkit-text-fill-color: transparent;
        }
        .nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav a {
            padding: 8px 18px;
            font-weight: 500;
            color: var(--text-light);
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            font-size: 0.95rem;
            position: relative;
        }
        .nav a:hover {
            color: var(--primary);
            background: var(--primary-light);
        }
        .nav a.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 600;
        }
        .nav a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            border-radius: 4px;
            background: var(--primary);
        }
        .nav-cta {
            margin-left: 12px;
        }
        .nav-toggle {
            display: none;
            font-size: 1.5rem;
            padding: 8px;
            color: var(--text);
            background: none;
            border: none;
            cursor: pointer;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: var(--bg-alt);
        }
        .nav-toggle:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }

        /* ===== Mobile Nav ===== */
        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }
            .nav {
                position: fixed;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(16px);
                -webkit-backdrop-filter: blur(16px);
                flex-direction: column;
                padding: 16px 24px 24px;
                gap: 4px;
                border-bottom: 1px solid var(--border);
                transform: translateY(-120%);
                opacity: 0;
                pointer-events: none;
                transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
                box-shadow: 0 12px 48px rgba(0, 0, 0, 0.10);
            }
            .nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav a {
                width: 100%;
                padding: 12px 16px;
                font-size: 1.05rem;
            }
            .nav a.active::after {
                display: none;
            }
            .nav-cta {
                margin-left: 0;
                margin-top: 8px;
                width: 100%;
            }
            .nav-cta .btn {
                width: 100%;
                justify-content: center;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.6rem;
            }
            .section {
                padding: var(--spacing-sm) 0;
            }
        }
        @media (max-width: 520px) {
            h1 {
                font-size: 1.7rem;
            }
            h2 {
                font-size: 1.35rem;
            }
            .container {
                padding: 0 16px;
            }
            .logo {
                font-size: 1.25rem;
            }
        }

        /* ===== Hero / Banner ===== */
        .hero-banner {
            margin-top: var(--header-h);
            padding: 80px 0 72px;
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
            position: relative;
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }
        .hero-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.20;
            pointer-events: none;
        }
        .hero-banner::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 20% 50%, rgba(37, 99, 235, 0.15) 0%, transparent 70%);
            pointer-events: none;
        }
        .hero-banner .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .hero-banner h1 {
            color: #fff;
            font-size: 3rem;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .hero-banner h1 span {
            background: linear-gradient(135deg, #60a5fa, #f59e0b);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-banner p {
            color: #cbd5e1;
            font-size: 1.15rem;
            max-width: 680px;
            margin: 0 auto 28px;
        }
        .hero-banner .badge-group {
            display: flex;
            justify-content: center;
            gap: 12px;
            flex-wrap: wrap;
            margin-bottom: 24px;
        }
        @media (max-width: 768px) {
            .hero-banner {
                padding: 56px 0 48px;
                min-height: 240px;
            }
            .hero-banner h1 {
                font-size: 2.1rem;
            }
            .hero-banner p {
                font-size: 1rem;
            }
        }
        @media (max-width: 520px) {
            .hero-banner h1 {
                font-size: 1.7rem;
            }
        }

        /* ===== Card ===== */
        .card {
            background: var(--bg);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: all var(--transition);
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: var(--primary-light);
        }
        .card-image {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
            border-radius: 0;
            display: block;
        }
        .card-body {
            padding: 20px 24px 24px;
        }
        .card-body .badge {
            margin-bottom: 10px;
        }
        .card-body h3 {
            margin-bottom: 8px;
        }
        .card-body h3 a {
            color: var(--text);
        }
        .card-body h3 a:hover {
            color: var(--primary);
        }
        .card-body p {
            font-size: 0.92rem;
            margin-bottom: 12px;
        }
        .card-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 0.85rem;
            color: var(--text-light);
            border-top: 1px solid var(--border);
            padding-top: 14px;
            margin-top: 4px;
        }
        .card-meta i {
            margin-right: 4px;
        }

        /* ===== Grid ===== */
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .grid-3 {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            .grid-2,
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
                gap: 20px;
            }
        }

        /* ===== Category Cards (icon style) ===== */
        .cat-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .cat-card {
            background: var(--bg);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            padding: 28px 20px 24px;
            text-align: center;
            transition: all var(--transition);
        }
        .cat-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: var(--primary-light);
        }
        .cat-card .icon {
            font-size: 2.4rem;
            color: var(--primary);
            margin-bottom: 14px;
            display: block;
        }
        .cat-card h3 {
            font-size: 1.05rem;
            margin-bottom: 6px;
        }
        .cat-card p {
            font-size: 0.88rem;
            margin-bottom: 0;
        }
        @media (max-width: 1024px) {
            .cat-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 520px) {
            .cat-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ===== Stats ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-item {
            text-align: center;
            padding: 20px 12px;
        }
        .stat-item .num {
            font-size: 2.6rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.2;
        }
        .stat-item .label {
            font-size: 0.95rem;
            color: var(--text-light);
            margin-top: 4px;
        }
        @media (max-width: 768px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .stat-item .num {
                font-size: 2rem;
            }
        }
        @media (max-width: 520px) {
            .stats-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        /* ===== List ===== */
        .list-card {
            background: var(--bg);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            padding: 20px 24px;
            display: flex;
            align-items: flex-start;
            gap: 16px;
            transition: all var(--transition);
        }
        .list-card:hover {
            transform: translateX(4px);
            box-shadow: var(--shadow-hover);
            border-color: var(--primary-light);
        }
        .list-card .rank {
            flex-shrink: 0;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.1rem;
        }
        .list-card .rank.gold {
            background: var(--accent-light);
            color: var(--accent-dark);
        }
        .list-card .content {
            flex: 1;
        }
        .list-card .content h4 {
            font-size: 1rem;
            margin-bottom: 4px;
        }
        .list-card .content p {
            font-size: 0.9rem;
            margin-bottom: 0;
        }
        .list-card .meta {
            font-size: 0.82rem;
            color: var(--text-light);
            white-space: nowrap;
            flex-shrink: 0;
            padding-top: 4px;
        }
        @media (max-width: 520px) {
            .list-card {
                flex-wrap: wrap;
                padding: 16px 18px;
            }
            .list-card .meta {
                width: 100%;
                white-space: normal;
                padding-top: 8px;
                border-top: 1px solid var(--border);
                margin-top: 6px;
            }
        }

        /* ===== FAQ ===== */
        .faq-item {
            border-bottom: 1px solid var(--border);
            padding: 18px 0;
        }
        .faq-item:first-child {
            padding-top: 0;
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 600;
            font-size: 1.05rem;
            color: var(--text);
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            padding: 4px 0;
            transition: color var(--transition);
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
            border-radius: 4px;
        }
        .faq-question .icon {
            transition: transform var(--transition);
            font-size: 1.2rem;
            color: var(--text-light);
            flex-shrink: 0;
            margin-left: 16px;
        }
        .faq-item.open .faq-question .icon {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 24px 0 0;
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 400px;
            padding-top: 12px;
            padding-bottom: 4px;
        }

        /* ===== CTA ===== */
        .cta-box {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            border-radius: var(--radius-lg);
            padding: 56px 48px;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .cta-box::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.08;
            pointer-events: none;
        }
        .cta-box h2 {
            color: #fff;
            font-size: 2rem;
            margin-bottom: 12px;
        }
        .cta-box p {
            color: #bfdbfe;
            font-size: 1.05rem;
            max-width: 560px;
            margin: 0 auto 28px;
        }
        .cta-box .btn {
            background: #fff;
            color: var(--primary) !important;
            border-color: #fff;
        }
        .cta-box .btn:hover {
            background: var(--accent);
            border-color: var(--accent);
            color: #fff !important;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.20);
        }
        @media (max-width: 768px) {
            .cta-box {
                padding: 36px 24px;
            }
            .cta-box h2 {
                font-size: 1.5rem;
            }
            .cta-box p {
                font-size: 0.95rem;
            }
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-dark);
            color: #cbd5e1;
            padding: 56px 0 0;
        }
        .footer .logo {
            background: none;
            -webkit-text-fill-color: #fff;
            color: #fff;
            font-weight: 800;
            font-size: 1.4rem;
            margin-bottom: 12px;
            display: inline-block;
        }
        .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 p {
            font-size: 0.92rem;
            color: #94a3b8;
            margin-bottom: 0;
            max-width: 320px;
        }
        .footer h4 {
            color: #fff;
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 16px;
        }
        .footer ul li {
            margin-bottom: 10px;
        }
        .footer ul li a {
            color: #94a3b8;
            font-size: 0.9rem;
            transition: color var(--transition);
        }
        .footer ul li a:hover {
            color: #fff;
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
            font-size: 0.85rem;
            color: #64748b;
            flex-wrap: wrap;
            gap: 8px;
        }
        @media (max-width: 1024px) {
            .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;
            }
        }

        /* ===== Section intro ===== */
        .section-header {
            text-align: center;
            max-width: 720px;
            margin: 0 auto 40px;
        }
        .section-header h2 {
            margin-bottom: 10px;
        }
        .section-header p {
            font-size: 1.05rem;
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.88rem;
            color: var(--text-light);
            padding: 16px 0 0;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--text-light);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb .sep {
            color: var(--border);
        }
        .breadcrumb .current {
            color: var(--text);
            font-weight: 500;
        }

        /* ===== Utility ===== */
        .mt-0 {
            margin-top: 0;
        }
        .mb-0 {
            margin-bottom: 0;
        }
        .mt-2 {
            margin-top: 16px;
        }
        .mb-2 {
            margin-bottom: 16px;
        }
        .gap-2 {
            gap: 12px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .flex-wrap {
            flex-wrap: wrap;
        }

        /* ===== Focus visible global ===== */
        :focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }

        /* ===== Smooth image loading ===== */
        img {
            background: var(--bg-alt);
        }

        /* ===== Tag list ===== */
        .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 8px;
        }
        .tag-list a {
            padding: 6px 16px;
            background: var(--bg-alt);
            border-radius: 50px;
            font-size: 0.85rem;
            color: var(--text-light);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .tag-list a:hover {
            background: var(--primary-light);
            color: var(--primary);
            border-color: var(--primary-light);
        }

        /* ===== Responsive images in cards ===== */
        .card-img-wrap {
            overflow: hidden;
            border-radius: 0;
        }
        .card-img-wrap img {
            transition: transform 0.5s ease;
            border-radius: 0;
        }
        .card:hover .card-img-wrap img {
            transform: scale(1.05);
        }

/* roulang page: article */
:root {
  --primary: #4F46E5;
  --primary-dark: #4338CA;
  --primary-light: #EEF2FF;
  --secondary: #10B981;
  --secondary-dark: #059669;
  --accent: #F59E0B;
  --bg: #F8FAFC;
  --bg-alt: #EEF2FF;
  --surface: #FFFFFF;
  --text: #1E293B;
  --text-weak: #64748B;
  --text-reverse: #FFFFFF;
  --border: #E2E8F0;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 4px 16px rgba(0,0,0,0.08), 0 2px 8px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --max-width: 1200px;
  --nav-height: 72px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font); background: var(--bg); color: var(--text); line-height: 1.7; font-size: 16px; -webkit-font-smoothing: antialiased; }
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-dark); }
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; }
.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
@media (max-width:768px) { .container { padding: 0 16px; } }

/* header / nav */
.header { position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,0.92); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); border-bottom: 1px solid var(--border); height: var(--nav-height); display: flex; align-items: center; }
.header .container { display: flex; align-items: center; justify-content: space-between; width: 100%; }
.logo { font-size: 1.5rem; font-weight: 800; color: var(--primary); letter-spacing: -0.02em; white-space: nowrap; background: linear-gradient(135deg, var(--primary), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.nav { display: flex; align-items: center; gap: 8px; }
.nav a { padding: 8px 16px; border-radius: var(--radius-sm); color: var(--text); font-weight: 500; font-size: 0.95rem; transition: var(--transition); position: relative; }
.nav a:hover { background: var(--primary-light); color: var(--primary); }
.nav a.active { background: var(--primary); color: #fff; }
.nav-cta { margin-left: 12px; }
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 12px 28px; border-radius: var(--radius-sm); font-weight: 600; font-size: 1rem; cursor: pointer; transition: var(--transition); border: none; line-height: 1.4; gap: 8px; }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 4px 12px rgba(79,70,229,0.3); }
.btn-primary:hover { background: var(--primary-dark); box-shadow: 0 6px 20px rgba(79,70,229,0.4); transform: translateY(-2px); color: #fff; }
.btn-secondary { background: var(--surface); color: var(--primary); border: 2px solid var(--border); }
.btn-secondary:hover { border-color: var(--primary); background: var(--primary-light); transform: translateY(-2px); }
.btn-sm { padding: 8px 20px; font-size: 0.9rem; }
.btn-accent { background: var(--accent); color: #1E293B; box-shadow: 0 4px 12px rgba(245,158,11,0.3); }
.btn-accent:hover { background: #D97706; transform: translateY(-2px); box-shadow: 0 6px 20px rgba(245,158,11,0.4); color: #1E293B; }
.mobile-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; background: none; border: none; }
.mobile-toggle span { display: block; width: 26px; height: 2.5px; background: var(--text); border-radius: 4px; transition: var(--transition); }
@media (max-width:768px) {
  .mobile-toggle { display: flex; }
  .nav { position: fixed; top: var(--nav-height); left: 0; right: 0; background: var(--surface); flex-direction: column; padding: 20px 24px; gap: 12px; border-bottom: 1px solid var(--border); box-shadow: var(--shadow); transform: translateY(-120%); opacity: 0; pointer-events: none; transition: var(--transition); z-index: 99; }
  .nav.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav a { width: 100%; text-align: center; padding: 12px; }
  .nav-cta { margin-left: 0; width: 100%; }
  .nav-cta .btn { width: 100%; justify-content: center; }
}

/* page banner */
.page-banner { position: relative; padding: 80px 0 60px; background: linear-gradient(135deg, #1E293B 0%, #334155 100%); overflow: hidden; min-height: 280px; display: flex; align-items: center; }
.page-banner .bg-overlay { position: absolute; inset: 0; background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat; opacity: 0.25; mix-blend-mode: overlay; }
.page-banner .container { position: relative; z-index: 2; }
.page-banner h1 { font-size: 2.4rem; font-weight: 800; color: #fff; line-height: 1.3; max-width: 800px; margin-bottom: 16px; word-break: break-word; }
.page-banner .meta { display: flex; flex-wrap: wrap; gap: 16px 24px; color: rgba(255,255,255,0.8); font-size: 0.95rem; align-items: center; }
.page-banner .meta .badge { background: var(--primary); color: #fff; padding: 4px 14px; border-radius: 20px; font-size: 0.8rem; font-weight: 600; }
.page-banner .meta span { display: flex; align-items: center; gap: 6px; }
@media (max-width:768px) {
  .page-banner { padding: 60px 0 40px; min-height: 200px; }
  .page-banner h1 { font-size: 1.6rem; }
}
@media (max-width:520px) {
  .page-banner h1 { font-size: 1.35rem; }
  .page-banner .meta { gap: 10px 16px; font-size: 0.85rem; }
}

/* breadcrumb */
.breadcrumb { padding: 16px 0; background: var(--surface); border-bottom: 1px solid var(--border); }
.breadcrumb .container { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; font-size: 0.9rem; color: var(--text-weak); }
.breadcrumb a { color: var(--text-weak); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { color: var(--border); }

/* article main */
.article-main { padding: 48px 0 64px; }
.article-layout { display: grid; grid-template-columns: 1fr 320px; gap: 40px; }
.article-content { background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow-sm); padding: 40px; overflow: hidden; }
.article-content .featured-image { margin: -40px -40px 32px -40px; border-radius: var(--radius) var(--radius) 0 0; overflow: hidden; max-height: 420px; object-fit: cover; width: calc(100% + 80px); }
.article-content .body { font-size: 1.05rem; line-height: 1.85; color: var(--text); }
.article-content .body p { margin-bottom: 1.2em; }
.article-content .body h2, .article-content .body h3 { margin-top: 1.6em; margin-bottom: 0.6em; font-weight: 700; line-height: 1.4; }
.article-content .body h2 { font-size: 1.5rem; }
.article-content .body h3 { font-size: 1.2rem; }
.article-content .body ul, .article-content .body ol { margin-bottom: 1.2em; padding-left: 1.6em; }
.article-content .body li { margin-bottom: 0.4em; list-style: disc; }
.article-content .body ol li { list-style: decimal; }
.article-content .body blockquote { border-left: 4px solid var(--primary); padding: 12px 20px; margin: 1.2em 0; background: var(--primary-light); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--text-weak); }
.article-content .body a { color: var(--primary); text-decoration: underline; }
.article-content .body img { border-radius: var(--radius-sm); margin: 1.2em 0; }
.article-content .body code { background: #F1F5F9; padding: 2px 8px; border-radius: 4px; font-size: 0.9em; }
.tags-wrap { margin-top: 32px; padding-top: 24px; border-top: 1px solid var(--border); display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.tags-wrap .tag-label { font-weight: 600; color: var(--text-weak); font-size: 0.9rem; }
.tags-wrap .tag { background: var(--primary-light); color: var(--primary); padding: 4px 14px; border-radius: 20px; font-size: 0.85rem; font-weight: 500; transition: var(--transition); }
.tags-wrap .tag:hover { background: var(--primary); color: #fff; }
.article-nav { margin-top: 40px; display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.article-nav a { display: flex; align-items: center; gap: 8px; color: var(--text-weak); font-weight: 500; transition: var(--transition); padding: 12px 20px; border-radius: var(--radius-sm); background: var(--bg); border: 1px solid var(--border); flex: 1; max-width: 48%; }
.article-nav a:hover { color: var(--primary); border-color: var(--primary); background: var(--primary-light); }
.article-nav .next { justify-content: flex-end; text-align: right; }
@media (max-width:1024px) {
  .article-layout { grid-template-columns: 1fr; }
}
@media (max-width:768px) {
  .article-main { padding: 24px 0 40px; }
  .article-content { padding: 24px; }
  .article-content .featured-image { margin: -24px -24px 24px -24px; width: calc(100% + 48px); }
  .article-nav a { max-width: 100%; flex: 1 1 100%; }
}
@media (max-width:520px) {
  .article-content { padding: 16px; }
  .article-content .featured-image { margin: -16px -16px 16px -16px; width: calc(100% + 32px); }
}

/* sidebar */
.article-sidebar { display: flex; flex-direction: column; gap: 28px; }
.sidebar-card { background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow-sm); padding: 24px; }
.sidebar-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 16px; padding-bottom: 12px; border-bottom: 2px solid var(--primary-light); color: var(--text); }
.sidebar-card ul li { margin-bottom: 10px; }
.sidebar-card ul li a { display: flex; align-items: center; gap: 10px; padding: 8px 12px; border-radius: var(--radius-sm); transition: var(--transition); color: var(--text); font-size: 0.95rem; }
.sidebar-card ul li a:hover { background: var(--primary-light); color: var(--primary); }
.sidebar-card ul li a .icon { width: 28px; height: 28px; border-radius: 6px; background: var(--primary-light); display: flex; align-items: center; justify-content: center; color: var(--primary); font-size: 0.85rem; flex-shrink: 0; }
.sidebar-cta { background: linear-gradient(135deg, var(--primary), #7C3AED); color: #fff; padding: 28px 24px; border-radius: var(--radius); text-align: center; }
.sidebar-cta h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 8px; border-bottom: none; color: #fff; padding-bottom: 0; }
.sidebar-cta p { font-size: 0.95rem; opacity: 0.9; margin-bottom: 16px; }
.sidebar-cta .btn { background: #fff; color: var(--primary); }
.sidebar-cta .btn:hover { background: var(--primary-light); }
@media (max-width:1024px) {
  .article-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
}
@media (max-width:768px) {
  .article-sidebar { grid-template-columns: 1fr; }
}

/* not found */
.not-found-wrap { text-align: center; padding: 60px 20px; }
.not-found-wrap .icon { font-size: 4rem; color: var(--text-weak); margin-bottom: 16px; }
.not-found-wrap h2 { font-size: 1.6rem; font-weight: 700; margin-bottom: 12px; }
.not-found-wrap p { color: var(--text-weak); margin-bottom: 24px; max-width: 480px; margin-left: auto; margin-right: auto; }

/* related section */
.related-section { padding: 48px 0 64px; background: var(--bg-alt); }
.related-section .section-title { font-size: 1.6rem; font-weight: 700; margin-bottom: 32px; text-align: center; }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.related-card { background: var(--surface); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); transition: var(--transition); }
.related-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.related-card .card-img { height: 180px; background: var(--border); overflow: hidden; }
.related-card .card-img img { width: 100%; height: 100%; object-fit: cover; transition: var(--transition); }
.related-card:hover .card-img img { transform: scale(1.05); }
.related-card .card-body { padding: 20px; }
.related-card .card-body h4 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.related-card .card-body h4 a { color: var(--text); }
.related-card .card-body h4 a:hover { color: var(--primary); }
.related-card .card-body p { font-size: 0.9rem; color: var(--text-weak); line-height: 1.6; }
.related-card .card-body .badge { display: inline-block; background: var(--primary-light); color: var(--primary); padding: 2px 12px; border-radius: 20px; font-size: 0.75rem; font-weight: 600; margin-bottom: 8px; }
@media (max-width:768px) {
  .related-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
}
@media (max-width:520px) {
  .related-grid { grid-template-columns: 1fr; }
  .related-section .section-title { font-size: 1.3rem; }
}

/* cta */
.cta-section { padding: 60px 0; background: linear-gradient(135deg, #1E293B 0%, #334155 100%); text-align: center; }
.cta-section h2 { font-size: 1.8rem; font-weight: 800; color: #fff; margin-bottom: 12px; }
.cta-section p { color: rgba(255,255,255,0.8); font-size: 1.05rem; margin-bottom: 28px; max-width: 600px; margin-left: auto; margin-right: auto; }
.cta-section .btn { font-size: 1.05rem; padding: 14px 36px; }
@media (max-width:768px) {
  .cta-section { padding: 40px 0; }
  .cta-section h2 { font-size: 1.4rem; }
}

/* footer */
.footer { background: #0F172A; color: rgba(255,255,255,0.8); padding: 60px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .logo { font-size: 1.4rem; margin-bottom: 12px; display: inline-block; background: linear-gradient(135deg, #A78BFA, #60A5FA); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.footer-brand p { font-size: 0.9rem; line-height: 1.7; color: rgba(255,255,255,0.6); max-width: 320px; }
.footer h4 { font-size: 1rem; font-weight: 700; color: #fff; margin-bottom: 16px; }
.footer ul li { margin-bottom: 10px; }
.footer ul li a { color: rgba(255,255,255,0.6); font-size: 0.9rem; transition: var(--transition); }
.footer ul li a:hover { color: #A78BFA; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding: 20px 0; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; font-size: 0.85rem; color: rgba(255,255,255,0.4); }
.footer-bottom a { color: rgba(255,255,255,0.5); }
.footer-bottom a:hover { color: #A78BFA; }
@media (max-width:768px) {
  .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; }
}

/* back to top */
.back-top { position: fixed; bottom: 32px; right: 32px; width: 48px; height: 48px; border-radius: 50%; background: var(--primary); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 1.3rem; box-shadow: var(--shadow); transition: var(--transition); opacity: 0; visibility: hidden; z-index: 50; cursor: pointer; border: none; }
.back-top.visible { opacity: 1; visibility: visible; }
.back-top:hover { background: var(--primary-dark); transform: translateY(-4px); }