/* roulang page: index */
:root {
  --bg-primary: #0b1929;
  --bg-secondary: #112240;
  --bg-card: #1a2d4a;
  --bg-card-hover: #1f3657;
  --text-primary: #e6f1ff;
  --text-secondary: #8892b0;
  --text-muted: #5a6d8a;
  --accent: #00b4d8;
  --accent-light: #4dabf7;
  --accent-glow: rgba(0, 180, 216, 0.15);
  --primary: #0d6efd;
  --primary-dark: #0a58ca;
  --success: #00d4aa;
  --warning: #ffc107;
  --danger: #e74c3c;
  --border: #233554;
  --border-light: #2a3f5e;
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.2);
  --shadow: 0 8px 32px rgba(0,0,0,0.35);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 30px rgba(0, 180, 216, 0.08);
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  --nav-height: 72px;
  --max-width: 1200px;
  --section-gap: 100px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body { font-family: var(--font-family); background: var(--bg-primary); color: var(--text-primary); line-height: 1.7; font-size: 16px; }
a { color: var(--accent-light); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent); }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; border-radius: 4px; }
img { max-width: 100%; height: auto; display: block; }
button, input, select, textarea { font-family: inherit; font-size: inherit; }
button { cursor: pointer; border: none; background: none; }
ul, ol { list-style: none; }
.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; position: relative; }
.section-title { font-size: 2.25rem; font-weight: 700; text-align: center; margin-bottom: 16px; letter-spacing: -0.02em; line-height: 1.3; }
.section-subtitle { font-size: 1.1rem; color: var(--text-secondary); text-align: center; max-width: 680px; margin: 0 auto 56px; line-height: 1.6; }
.text-gradient { background: linear-gradient(135deg, var(--accent-light), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; padding: 14px 32px; border-radius: 50px; font-weight: 600; font-size: 1rem; transition: all var(--transition); position: relative; overflow: hidden; border: none; cursor: pointer; }
.btn-primary { background: linear-gradient(135deg, var(--accent), #0090b0); color: #fff; box-shadow: 0 4px 20px rgba(0, 180, 216, 0.35); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(0, 180, 216, 0.5); color: #fff; }
.btn-primary:active { transform: translateY(0); }
.btn-outline { background: transparent; color: var(--accent-light); border: 2px solid var(--accent); }
.btn-outline:hover { background: var(--accent); color: #fff; transform: translateY(-2px); }
.btn-lg { padding: 18px 40px; font-size: 1.1rem; }
.btn-sm { padding: 10px 22px; font-size: 0.875rem; }
.badge { display: inline-block; padding: 4px 14px; border-radius: 50px; font-size: 0.75rem; font-weight: 600; letter-spacing: 0.03em; text-transform: uppercase; background: var(--accent-glow); color: var(--accent-light); border: 1px solid rgba(0, 180, 216, 0.2); }
.badge-success { background: rgba(0, 212, 170, 0.15); color: var(--success); border-color: rgba(0, 212, 170, 0.25); }
.badge-warning { background: rgba(255, 193, 7, 0.15); color: var(--warning); border-color: rgba(255, 193, 7, 0.25); }
.card { background: var(--bg-card); border-radius: var(--radius); border: 1px solid var(--border); padding: 32px; transition: all var(--transition); }
.card:hover { background: var(--bg-card-hover); border-color: var(--border-light); transform: translateY(-4px); box-shadow: var(--shadow); }
.card-img { border-radius: var(--radius) var(--radius) 0 0; overflow: hidden; margin: -32px -32px 20px; }
.card-img img { width: 100%; height: 200px; object-fit: cover; }
.tag { display: inline-block; padding: 2px 12px; border-radius: 50px; font-size: 0.75rem; background: rgba(77, 171, 247, 0.12); color: var(--accent-light); border: 1px solid rgba(77, 171, 247, 0.15); }
.tag + .tag { margin-left: 6px; }
/* ===== Header & Nav ===== */
header { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: rgba(11, 25, 41, 0.92); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); border-bottom: 1px solid rgba(35, 53, 84, 0.5); height: var(--nav-height); transition: background var(--transition); }
header.scrolled { background: rgba(11, 25, 41, 0.98); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: var(--nav-height); }
.logo { display: flex; align-items: center; gap: 10px; font-size: 1.25rem; font-weight: 800; color: var(--text-primary); letter-spacing: -0.01em; }
.logo i { color: var(--accent); font-size: 1.5rem; }
.logo span { background: linear-gradient(135deg, var(--accent-light), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.nav-links { display: flex; align-items: center; gap: 8px; }
.nav-links a { display: flex; align-items: center; gap: 6px; padding: 8px 20px; border-radius: 50px; color: var(--text-secondary); font-weight: 500; font-size: 0.95rem; transition: all var(--transition); position: relative; }
.nav-links a:hover, .nav-links a.active { color: var(--text-primary); background: rgba(0, 180, 216, 0.1); }
.nav-links a.active { color: var(--accent-light); background: rgba(0, 180, 216, 0.12); }
.nav-links a i { font-size: 0.9rem; }
.nav-cta { margin-left: 12px; }
.mobile-menu-btn { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; background: none; border: none; }
.mobile-menu-btn span { display: block; width: 26px; height: 2px; background: var(--text-primary); border-radius: 4px; transition: all var(--transition); }
/* ===== Bottom Tab (Mobile) ===== */
.bottom-tab { display: none; position: fixed; bottom: 0; left: 0; right: 0; z-index: 999; background: rgba(11, 25, 41, 0.96); backdrop-filter: blur(20px); border-top: 1px solid rgba(35, 53, 84, 0.6); padding: 8px 0; justify-content: space-around; align-items: center; }
.bottom-tab a { display: flex; flex-direction: column; align-items: center; gap: 3px; color: var(--text-muted); font-size: 0.7rem; transition: color var(--transition); padding: 6px 12px; border-radius: 8px; }
.bottom-tab a i { font-size: 1.35rem; }
.bottom-tab a:hover, .bottom-tab a.active { color: var(--accent-light); }
.bottom-tab a.active { background: rgba(0, 180, 216, 0.08); }
/* ===== Hero ===== */
.hero { min-height: 92vh; display: flex; align-items: center; position: relative; overflow: hidden; padding-top: var(--nav-height); 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(11, 25, 41, 0.92) 40%, rgba(11, 25, 41, 0.6) 70%, rgba(11, 25, 41, 0.3) 100%); z-index: 1; }
.hero::after { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse at 30% 50%, rgba(0, 180, 216, 0.06) 0%, transparent 70%); z-index: 1; }
.hero .container { position: relative; z-index: 2; }
.hero-content { max-width: 720px; }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; background: rgba(0, 180, 216, 0.12); border: 1px solid rgba(0, 180, 216, 0.2); padding: 6px 18px; border-radius: 50px; font-size: 0.85rem; color: var(--accent-light); margin-bottom: 28px; }
.hero-badge i { font-size: 0.9rem; }
.hero h1 { font-size: 3.5rem; font-weight: 800; line-height: 1.15; margin-bottom: 20px; letter-spacing: -0.03em; }
.hero h1 .highlight { background: linear-gradient(135deg, var(--accent-light), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero p { font-size: 1.2rem; color: var(--text-secondary); max-width: 580px; margin-bottom: 36px; line-height: 1.7; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 48px; margin-top: 56px; padding-top: 36px; border-top: 1px solid rgba(35, 53, 84, 0.5); }
.hero-stat h3 { font-size: 2rem; font-weight: 700; color: var(--accent-light); }
.hero-stat p { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 0; }
/* ===== 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: 16px; background: rgba(0, 180, 216, 0.1); display: flex; align-items: center; justify-content: center; margin: 0 auto 20px; font-size: 1.8rem; color: var(--accent); border: 1px solid rgba(0, 180, 216, 0.15); }
.feature-card h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 10px; }
.feature-card p { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.6; }
/* ===== Cover Cards ===== */
.cover-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.cover-card { overflow: hidden; }
.cover-card .card-img { margin: -32px -32px 0; position: relative; }
.cover-card .card-img::after { content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 60%; background: linear-gradient(transparent, var(--bg-card)); }
.cover-card .card-img img { height: 220px; }
.cover-card .card-body { padding-top: 20px; }
.cover-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 8px; }
.cover-card p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.6; margin-bottom: 16px; }
.cover-card .tags { display: flex; flex-wrap: wrap; gap: 6px; }
/* ===== Steps / Process ===== */
.steps-section { background: var(--bg-secondary); }
.steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; counter-reset: step; }
.step-card { text-align: center; padding: 32px 20px; position: relative; counter-increment: step; }
.step-card::before { content: counter(step); position: absolute; top: -12px; left: 50%; transform: translateX(-50%); width: 40px; height: 40px; border-radius: 50%; background: linear-gradient(135deg, var(--accent), #0090b0); display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 1.1rem; color: #fff; box-shadow: 0 4px 16px rgba(0, 180, 216, 0.3); }
.step-card .step-icon { font-size: 2.2rem; color: var(--accent); margin-bottom: 16px; margin-top: 8px; }
.step-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
.step-card p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.5; }
/* ===== Latest Posts (CMS) ===== */
.posts-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.post-card { display: flex; flex-direction: column; }
.post-card .post-meta { display: flex; align-items: center; gap: 12px; font-size: 0.85rem; color: var(--text-muted); margin-bottom: 10px; flex-wrap: wrap; }
.post-card .post-meta .cat { color: var(--accent-light); font-weight: 600; }
.post-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; line-height: 1.4; }
.post-card h3 a { color: var(--text-primary); }
.post-card h3 a:hover { color: var(--accent-light); }
.post-card p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.6; margin-bottom: 16px; flex: 1; }
.post-card .post-footer { display: flex; align-items: center; justify-content: space-between; padding-top: 12px; border-top: 1px solid var(--border); }
.post-empty { grid-column: 1 / -1; text-align: center; padding: 48px 20px; color: var(--text-muted); font-size: 1.05rem; background: var(--bg-card); border-radius: var(--radius); border: 1px dashed var(--border); }
/* ===== Stats / Numbers ===== */
.stats-band { background: linear-gradient(135deg, var(--bg-secondary), var(--bg-card)); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat-item h2 { font-size: 2.8rem; font-weight: 800; background: linear-gradient(135deg, var(--accent-light), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.stat-item p { color: var(--text-secondary); font-size: 1rem; margin-top: 4px; }
/* ===== FAQ ===== */
.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); border: 1px solid var(--border); overflow: hidden; transition: border-color var(--transition); }
.faq-item:hover { border-color: var(--border-light); }
.faq-question { display: flex; align-items: center; justify-content: space-between; width: 100%; padding: 20px 28px; background: none; border: none; color: var(--text-primary); font-size: 1.05rem; font-weight: 600; text-align: left; cursor: pointer; transition: color var(--transition); gap: 16px; }
.faq-question i { color: var(--accent); transition: transform var(--transition); font-size: 1.1rem; flex-shrink: 0; }
.faq-item.open .faq-question i { transform: rotate(180deg); }
.faq-answer { padding: 0 28px 20px; color: var(--text-secondary); font-size: 0.95rem; line-height: 1.7; display: none; }
.faq-item.open .faq-answer { display: block; }
/* ===== CTA ===== */
.cta-section { background: url('/assets/images/backpic/back-2.png') center center/cover no-repeat; position: relative; }
.cta-section::before { content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(11, 25, 41, 0.92) 30%, rgba(11, 25, 41, 0.7) 70%, rgba(11, 25, 41, 0.5) 100%); }
.cta-section .container { position: relative; z-index: 2; text-align: center; }
.cta-section h2 { font-size: 2.5rem; font-weight: 800; margin-bottom: 16px; }
.cta-section p { color: var(--text-secondary); max-width: 560px; margin: 0 auto 32px; font-size: 1.1rem; }
.cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
/* ===== Footer ===== */
footer { background: var(--bg-secondary); border-top: 1px solid var(--border); padding: 60px 0 100px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .logo { font-size: 1.3rem; margin-bottom: 16px; }
.footer-brand p { color: var(--text-secondary); font-size: 0.9rem; max-width: 320px; line-height: 1.7; }
.footer-col h4 { font-size: 1rem; font-weight: 700; margin-bottom: 20px; color: var(--text-primary); }
.footer-col a { display: block; padding: 5px 0; color: var(--text-secondary); font-size: 0.9rem; transition: color var(--transition); }
.footer-col a:hover { color: var(--accent-light); }
.footer-bottom { padding-top: 28px; border-top: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; }
.footer-bottom p { color: var(--text-muted); font-size: 0.85rem; }
.footer-bottom-links { display: flex; gap: 20px; }
.footer-bottom-links a { color: var(--text-muted); font-size: 0.85rem; }
.footer-bottom-links a:hover { color: var(--accent-light); }
/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .features-grid, .cover-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
  .hero h1 { font-size: 2.8rem; }
}
@media (max-width: 768px) {
  .nav-links, .nav-cta { display: none; }
  .mobile-menu-btn { display: flex; }
  .mobile-menu-open .nav-links { display: flex; flex-direction: column; position: absolute; top: var(--nav-height); left: 0; right: 0; background: rgba(11, 25, 41, 0.98); backdrop-filter: blur(20px); padding: 20px 24px; gap: 4px; border-bottom: 1px solid var(--border); }
  .mobile-menu-open .nav-links a { width: 100%; padding: 12px 20px; }
  .mobile-menu-open .nav-cta { display: block; position: absolute; top: calc(var(--nav-height) + 220px); left: 24px; right: 24px; }
  .hero { min-height: 80vh; }
  .hero h1 { font-size: 2.2rem; }
  .hero p { font-size: 1rem; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .hero-stat h3 { font-size: 1.5rem; }
  .section-title { font-size: 1.7rem; }
  .section-subtitle { font-size: 0.95rem; }
  .features-grid, .cover-grid { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: 1fr 1fr; }
  .posts-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .bottom-tab { display: flex; }
  footer { padding-bottom: 80px; }
  .cta-section h2 { font-size: 1.8rem; }
}
@media (max-width: 520px) {
  .container { padding: 0 16px; }
  .hero h1 { font-size: 1.8rem; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .hero-stats { flex-direction: column; gap: 16px; }
  .steps-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 20px; }
  .stat-item h2 { font-size: 2rem; }
  .section { padding: 48px 0; }
  .cta-actions { flex-direction: column; }
  .cta-actions .btn { width: 100%; justify-content: center; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

/* roulang page: article */
:root {
  --primary: #6c5ce7;
  --primary-dark: #5a4bd1;
  --primary-light: #a29bfe;
  --secondary: #fd79a8;
  --accent: #00cec9;
  --bg-dark: #0a0a1a;
  --bg-card: #12122a;
  --bg-section: #0f0f25;
  --bg-light: #1a1a3e;
  --text-primary: #f0f0ff;
  --text-secondary: #b0b0d0;
  --text-muted: #7070a0;
  --border-color: #2a2a5a;
  --border-light: #3a3a6a;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 8px 32px rgba(0,0,0,0.4);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 30px rgba(108,92,231,0.15);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body { font-family: var(--font-sans); background: var(--bg-dark); color: var(--text-primary); line-height: 1.7; min-height: 100vh; overflow-x: hidden; }
a { color: var(--primary-light); text-decoration: none; transition: var(--transition); }
a:hover { color: #fff; }
img { max-width: 100%; height: auto; display: block; }
button, input, textarea { font-family: inherit; font-size: 1rem; border: none; outline: none; }
ul, ol { list-style: none; }
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }
@media (max-width: 768px) { .container { padding: 0 16px; } }

/* ===== Header & Nav ===== */
.site-header { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: rgba(10,10,26,0.92); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); border-bottom: 1px solid rgba(42,42,90,0.5); transition: var(--transition); }
.site-header.scrolled { background: rgba(10,10,26,0.98); box-shadow: 0 4px 30px rgba(0,0,0,0.5); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.logo { display: flex; align-items: center; gap: 10px; font-size: 1.25rem; font-weight: 700; color: #fff; letter-spacing: 0.5px; }
.logo i { font-size: 1.5rem; color: var(--primary-light); background: linear-gradient(135deg, var(--primary), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.logo span { background: linear-gradient(135deg, #fff, #c0c0f0); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.logo:hover { opacity: 0.9; }
.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a { display: flex; align-items: center; gap: 6px; padding: 8px 18px; border-radius: var(--radius-sm); color: var(--text-secondary); font-size: 0.9rem; font-weight: 500; transition: var(--transition); position: relative; }
.nav-links a i { font-size: 0.85rem; }
.nav-links a:hover, .nav-links a.active { color: #fff; background: rgba(108,92,231,0.15); }
.nav-links a.active { background: linear-gradient(135deg, rgba(108,92,231,0.25), rgba(253,121,168,0.1)); color: #fff; }
.nav-links a.active::after { content: ''; position: absolute; bottom: -1px; left: 50%; transform: translateX(-50%); width: 60%; height: 2px; background: linear-gradient(90deg, var(--primary), var(--secondary)); border-radius: 2px; }
.nav-toggle { display: none; background: none; color: var(--text-primary); font-size: 1.5rem; padding: 8px; cursor: pointer; border-radius: var(--radius-sm); }
.nav-toggle:hover { background: rgba(108,92,231,0.1); }
@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav-links { position: fixed; top: 68px; left: 0; right: 0; background: rgba(10,10,26,0.98); backdrop-filter: blur(20px); flex-direction: column; padding: 16px; gap: 4px; border-bottom: 1px solid var(--border-color); transform: translateY(-120%); opacity: 0; pointer-events: none; transition: var(--transition); }
  .nav-links.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav-links a { width: 100%; padding: 12px 16px; font-size: 1rem; border-radius: var(--radius-sm); }
  .nav-links a.active::after { display: none; }
}

/* ===== Mobile Bottom Tab ===== */
.mobile-bottom-tab { display: none; position: fixed; bottom: 0; left: 0; right: 0; z-index: 999; background: rgba(10,10,26,0.96); backdrop-filter: blur(20px); border-top: 1px solid var(--border-color); padding: 6px 12px; padding-bottom: max(6px, env(safe-area-inset-bottom)); }
.mobile-bottom-tab .tab-inner { display: flex; justify-content: space-around; align-items: center; max-width: 500px; margin: 0 auto; }
.mobile-bottom-tab a { display: flex; flex-direction: column; align-items: center; gap: 2px; padding: 6px 12px; border-radius: var(--radius-sm); color: var(--text-muted); font-size: 0.65rem; font-weight: 500; transition: var(--transition); }
.mobile-bottom-tab a i { font-size: 1.2rem; }
.mobile-bottom-tab a:hover, .mobile-bottom-tab a.active { color: var(--primary-light); }
.mobile-bottom-tab a.active { color: #fff; }
@media (max-width: 768px) {
  .mobile-bottom-tab { display: block; }
  body { padding-bottom: 68px; }
}

/* ===== Article Hero ===== */
.article-hero { position: relative; padding: 140px 0 60px; background: var(--bg-section); overflow: hidden; }
.article-hero::before { content: ''; position: absolute; inset: 0; background: url('/assets/images/backpic/back-1.png') center/cover no-repeat; opacity: 0.08; }
.article-hero::after { content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(10,10,26,0.9) 0%, rgba(10,10,26,0.6) 100%); }
.article-hero .container { position: relative; z-index: 2; }
.article-breadcrumb { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 20px; font-size: 0.85rem; color: var(--text-muted); }
.article-breadcrumb a { color: var(--text-muted); }
.article-breadcrumb a:hover { color: var(--primary-light); }
.article-breadcrumb .sep { color: var(--text-muted); opacity: 0.5; }
.article-breadcrumb .current { color: var(--text-secondary); }
.article-hero h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 800; line-height: 1.3; color: #fff; margin-bottom: 16px; letter-spacing: -0.5px; }
.article-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 16px 24px; margin-bottom: 8px; color: var(--text-muted); font-size: 0.9rem; }
.article-meta .tag { display: inline-flex; align-items: center; gap: 6px; padding: 4px 14px; background: linear-gradient(135deg, rgba(108,92,231,0.2), rgba(253,121,168,0.1)); border-radius: 20px; color: var(--primary-light); font-size: 0.8rem; font-weight: 500; }
.article-meta .tag i { font-size: 0.75rem; }
.article-meta span { display: flex; align-items: center; gap: 6px; }
.article-meta i { font-size: 0.85rem; }

/* ===== Article Main ===== */
.article-main { padding: 60px 0 80px; background: var(--bg-dark); }
.article-layout { display: grid; grid-template-columns: 1fr 320px; gap: 48px; align-items: start; }
.article-body { background: var(--bg-card); border-radius: var(--radius-lg); border: 1px solid var(--border-color); padding: 40px; box-shadow: var(--shadow-md); }
.article-body .content { font-size: 1.05rem; line-height: 1.9; color: var(--text-secondary); }
.article-body .content p { margin-bottom: 1.2em; }
.article-body .content h2, .article-body .content h3 { color: #fff; margin-top: 1.8em; margin-bottom: 0.6em; font-weight: 700; }
.article-body .content h2 { font-size: 1.6rem; }
.article-body .content h3 { font-size: 1.25rem; }
.article-body .content ul, .article-body .content ol { padding-left: 1.5em; margin-bottom: 1.2em; }
.article-body .content li { margin-bottom: 0.5em; list-style: disc; }
.article-body .content a { color: var(--primary-light); text-decoration: underline; text-underline-offset: 2px; }
.article-body .content a:hover { color: #fff; }
.article-body .content img { border-radius: var(--radius-md); margin: 1.5em 0; box-shadow: var(--shadow-sm); }
.article-body .content blockquote { border-left: 4px solid var(--primary); padding: 12px 20px; margin: 1.5em 0; background: rgba(108,92,231,0.05); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--text-secondary); font-style: italic; }
.article-body .content code { background: rgba(108,92,231,0.1); padding: 2px 8px; border-radius: 4px; font-size: 0.9em; color: var(--primary-light); }
.article-body .content pre { background: rgba(0,0,0,0.3); padding: 20px; border-radius: var(--radius-md); overflow-x: auto; margin: 1.5em 0; border: 1px solid var(--border-color); }
.article-body .content pre code { background: none; padding: 0; color: inherit; }
.article-not-found { text-align: center; padding: 60px 20px; }
.article-not-found i { font-size: 3rem; color: var(--text-muted); margin-bottom: 20px; }
.article-not-found h2 { font-size: 1.8rem; color: #fff; margin-bottom: 12px; }
.article-not-found p { color: var(--text-muted); margin-bottom: 24px; }
.article-not-found .btn-back { display: inline-flex; align-items: center; gap: 8px; padding: 12px 28px; background: linear-gradient(135deg, var(--primary), var(--secondary)); color: #fff; border-radius: var(--radius-md); font-weight: 600; font-size: 0.95rem; transition: var(--transition); }
.article-not-found .btn-back:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(108,92,231,0.3); color: #fff; }

/* ===== Sidebar ===== */
.article-sidebar { display: flex; flex-direction: column; gap: 28px; }
.sidebar-card { background: var(--bg-card); border-radius: var(--radius-md); border: 1px solid var(--border-color); padding: 24px; box-shadow: var(--shadow-sm); }
.sidebar-card h3 { font-size: 1.1rem; font-weight: 700; color: #fff; margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }
.sidebar-card h3 i { color: var(--primary-light); font-size: 1rem; }
.sidebar-list { display: flex; flex-direction: column; gap: 2px; }
.sidebar-list a { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: var(--radius-sm); color: var(--text-secondary); font-size: 0.9rem; transition: var(--transition); }
.sidebar-list a:hover { background: rgba(108,92,231,0.08); color: #fff; padding-left: 16px; }
.sidebar-list a i { font-size: 0.8rem; color: var(--primary-light); opacity: 0.6; }
.sidebar-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.sidebar-tags a { padding: 6px 14px; border-radius: 20px; background: rgba(108,92,231,0.08); color: var(--text-secondary); font-size: 0.8rem; border: 1px solid var(--border-color); transition: var(--transition); }
.sidebar-tags a:hover { background: rgba(108,92,231,0.2); color: #fff; border-color: var(--primary); }
.sidebar-cta { background: linear-gradient(135deg, rgba(108,92,231,0.15), rgba(253,121,168,0.05)); border: 1px solid rgba(108,92,231,0.2); }
.sidebar-cta h3 { color: #fff; }
.sidebar-cta p { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 16px; line-height: 1.6; }
.sidebar-cta .btn-cta { display: inline-flex; align-items: center; gap: 8px; padding: 10px 24px; background: linear-gradient(135deg, var(--primary), var(--secondary)); color: #fff; border-radius: var(--radius-sm); font-weight: 600; font-size: 0.9rem; transition: var(--transition); width: 100%; justify-content: center; }
.sidebar-cta .btn-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(108,92,231,0.3); color: #fff; }

@media (max-width: 1024px) {
  .article-layout { grid-template-columns: 1fr; gap: 32px; }
  .article-sidebar { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; }
}
@media (max-width: 768px) {
  .article-hero { padding: 120px 0 40px; }
  .article-body { padding: 24px 20px; }
  .article-body .content { font-size: 1rem; }
  .article-sidebar { grid-template-columns: 1fr; }
}

/* ===== Footer ===== */
footer { background: var(--bg-card); border-top: 1px solid var(--border-color); padding: 60px 0 30px; margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .logo { margin-bottom: 16px; }
.footer-brand p { color: var(--text-muted); font-size: 0.9rem; line-height: 1.7; max-width: 320px; }
.footer-col h4 { color: #fff; font-size: 1rem; font-weight: 700; margin-bottom: 16px; letter-spacing: 0.5px; }
.footer-col a { display: block; color: var(--text-muted); font-size: 0.88rem; padding: 5px 0; transition: var(--transition); }
.footer-col a:hover { color: var(--primary-light); padding-left: 4px; }
.footer-bottom { border-top: 1px solid var(--border-color); padding-top: 24px; display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 12px; }
.footer-bottom p { color: var(--text-muted); font-size: 0.82rem; }
.footer-bottom-links { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-bottom-links a { color: var(--text-muted); font-size: 0.82rem; }
.footer-bottom-links a:hover { color: var(--primary-light); }

@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 768px) {
  footer { padding: 40px 0 20px; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-brand p { max-width: 100%; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .footer-bottom-links { justify-content: center; }
}

/* ===== Utility ===== */
.text-gradient { background: linear-gradient(135deg, var(--primary-light), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.glow-line { width: 60px; height: 3px; background: linear-gradient(90deg, var(--primary), var(--secondary)); border-radius: 3px; margin-bottom: 16px; }

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-light); }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #3b82f6;
            --primary-bg: #eff6ff;
            --secondary: #f59e0b;
            --secondary-dark: #d97706;
            --accent: #10b981;
            --dark: #0f172a;
            --dark-2: #1e293b;
            --dark-3: #334155;
            --gray-50: #f8fafc;
            --gray-100: #f1f5f9;
            --gray-200: #e2e8f0;
            --gray-300: #cbd5e1;
            --gray-400: #94a3b8;
            --gray-500: #64748b;
            --gray-600: #475569;
            --gray-700: #334155;
            --text: #1e293b;
            --text-light: #64748b;
            --white: #ffffff;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 8px 40px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 16px 56px rgba(0, 0, 0, 0.10);
            --shadow-hover: 0 12px 48px rgba(37, 99, 235, 0.12);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', 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: 1.6;
            color: var(--text);
            background: var(--gray-50);
        }

        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);
        }

        button,
        input,
        textarea,
        select {
            font-family: var(--font);
            font-size: 1rem;
            outline: none;
            transition: border-color var(--transition), box-shadow var(--transition);
        }

        ul,
        ol {
            list-style: none;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.25;
            font-weight: 700;
            color: var(--dark);
        }

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

        /* ===== Header & Navigation ===== */
        header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-height);
            background: rgba(15, 23, 42, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            z-index: 1000;
            transition: background var(--transition);
        }

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

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.25rem;
            font-weight: 800;
            color: var(--white);
            text-decoration: none;
            letter-spacing: -0.02em;
        }
        .logo i {
            color: var(--secondary);
            font-size: 1.5rem;
        }
        .logo span {
            background: linear-gradient(135deg, #fff 60%, #94a3b8);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .logo:hover span {
            background: linear-gradient(135deg, var(--secondary), #fbbf24);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .logo:hover {
            color: var(--white);
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-links a {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.9rem;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.75);
            text-decoration: none;
            transition: all var(--transition);
            position: relative;
        }
        .nav-links a i {
            font-size: 0.85rem;
        }
        .nav-links a:hover {
            color: var(--white);
            background: rgba(255, 255, 255, 0.08);
        }
        .nav-links a.active {
            color: var(--white);
            background: rgba(37, 99, 235, 0.25);
        }
        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 50%;
            transform: translateX(-50%);
            width: 60%;
            height: 2px;
            background: var(--primary-light);
            border-radius: 2px;
        }

        /* Mobile bottom tab */
        .mobile-tab-bar {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            height: 64px;
            background: rgba(15, 23, 42, 0.96);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            z-index: 999;
            justify-content: space-around;
            align-items: center;
            padding: 0 8px;
        }
        .mobile-tab-bar a {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 2px;
            padding: 6px 12px;
            border-radius: var(--radius-sm);
            font-size: 0.65rem;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.55);
            text-decoration: none;
            transition: all var(--transition);
            min-width: 56px;
        }
        .mobile-tab-bar a i {
            font-size: 1.2rem;
        }
        .mobile-tab-bar a:hover {
            color: var(--white);
        }
        .mobile-tab-bar a.active {
            color: var(--secondary);
        }

        /* ===== Hero / Banner ===== */
        .category-banner {
            position: relative;
            padding: 120px 0 80px;
            margin-top: var(--header-height);
            background: var(--dark);
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }
        .category-banner .bg-overlay {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.35;
            transform: scale(1.05);
            transition: transform 0.6s ease;
        }
        .category-banner:hover .bg-overlay {
            transform: scale(1);
        }
        .category-banner .overlay-gradient {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.92) 0%, rgba(15, 23, 42, 0.70) 60%, rgba(37, 99, 235, 0.20) 100%);
        }
        .category-banner .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .category-banner .breadcrumb {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.5);
            margin-bottom: 20px;
        }
        .category-banner .breadcrumb a {
            color: rgba(255, 255, 255, 0.6);
            text-decoration: none;
            transition: color var(--transition);
        }
        .category-banner .breadcrumb a:hover {
            color: var(--secondary);
        }
        .category-banner .breadcrumb span {
            color: rgba(255, 255, 255, 0.8);
        }
        .category-banner h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--white);
            margin-bottom: 16px;
            letter-spacing: -0.03em;
            line-height: 1.15;
        }
        .category-banner h1 i {
            color: var(--secondary);
            margin-right: 8px;
        }
        .category-banner p {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.7);
            max-width: 680px;
            margin: 0 auto 24px;
            line-height: 1.7;
        }
        .category-banner .banner-stats {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 40px;
            flex-wrap: wrap;
            margin-top: 12px;
        }
        .category-banner .banner-stats .stat-item {
            text-align: center;
        }
        .category-banner .banner-stats .stat-number {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--white);
            display: block;
            line-height: 1.2;
        }
        .category-banner .banner-stats .stat-label {
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.5);
            text-transform: uppercase;
            letter-spacing: 0.04em;
        }

        /* ===== Main Content ===== */
        main {
            padding: 60px 0 80px;
        }

        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title h2 {
            font-size: 2rem;
            font-weight: 800;
            color: var(--dark);
            letter-spacing: -0.02em;
            margin-bottom: 12px;
        }
        .section-title h2 i {
            color: var(--primary);
            margin-right: 8px;
        }
        .section-title p {
            font-size: 1.05rem;
            color: var(--text-light);
            max-width: 560px;
            margin: 0 auto;
            line-height: 1.7;
        }

        /* ===== Guide Cards ===== */
        .guide-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
            gap: 28px;
        }
        .guide-card {
            background: var(--white);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: all var(--transition);
            border: 1px solid var(--gray-100);
            display: flex;
            flex-direction: column;
        }
        .guide-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: var(--primary-bg);
        }
        .guide-card .card-img {
            height: 200px;
            overflow: hidden;
            position: relative;
        }
        .guide-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .guide-card:hover .card-img img {
            transform: scale(1.05);
        }
        .guide-card .card-img .tag {
            position: absolute;
            top: 16px;
            left: 16px;
            background: var(--primary);
            color: var(--white);
            font-size: 0.75rem;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 20px;
            letter-spacing: 0.02em;
        }
        .guide-card .card-body {
            padding: 24px 24px 28px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .guide-card .card-body h3 {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 10px;
            line-height: 1.4;
        }
        .guide-card .card-body h3 a {
            color: var(--dark);
            text-decoration: none;
            transition: color var(--transition);
        }
        .guide-card .card-body h3 a:hover {
            color: var(--primary);
        }
        .guide-card .card-body p {
            font-size: 0.9rem;
            color: var(--text-light);
            line-height: 1.7;
            margin-bottom: 16px;
            flex: 1;
        }
        .guide-card .card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.8rem;
            color: var(--gray-400);
            border-top: 1px solid var(--gray-100);
            padding-top: 14px;
            margin-top: auto;
        }
        .guide-card .card-meta .read-more {
            color: var(--primary);
            font-weight: 600;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 4px;
            transition: gap var(--transition);
        }
        .guide-card .card-meta .read-more:hover {
            gap: 8px;
        }

        /* ===== Steps Section ===== */
        .steps-section {
            background: var(--white);
            padding: 70px 0;
            border-radius: var(--radius-xl);
            margin: 20px 0;
            box-shadow: var(--shadow);
        }
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 32px;
            counter-reset: step-counter;
        }
        .step-item {
            text-align: center;
            padding: 32px 20px 28px;
            border-radius: var(--radius);
            background: var(--gray-50);
            border: 1px solid var(--gray-100);
            transition: all var(--transition);
            position: relative;
        }
        .step-item:hover {
            background: var(--primary-bg);
            border-color: var(--primary-light);
            transform: translateY(-4px);
            box-shadow: var(--shadow);
        }
        .step-item .step-num {
            counter-increment: step-counter;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: var(--white);
            font-size: 1.2rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            transition: background var(--transition);
        }
        .step-item:hover .step-num {
            background: var(--primary-dark);
        }
        .step-item h4 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 8px;
        }
        .step-item p {
            font-size: 0.85rem;
            color: var(--text-light);
            line-height: 1.6;
        }

        /* ===== Feature Highlights ===== */
        .feature-highlights {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 24px;
            margin: 40px 0;
        }
        .feature-item {
            background: var(--white);
            border-radius: var(--radius);
            padding: 28px 24px;
            border: 1px solid var(--gray-100);
            box-shadow: var(--shadow);
            transition: all var(--transition);
            display: flex;
            gap: 16px;
            align-items: flex-start;
        }
        .feature-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: var(--primary-bg);
        }
        .feature-item .f-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            background: var(--primary-bg);
            color: var(--primary);
            font-size: 1.4rem;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            transition: background var(--transition), color var(--transition);
        }
        .feature-item:hover .f-icon {
            background: var(--primary);
            color: var(--white);
        }
        .feature-item .f-content h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 4px;
        }
        .feature-item .f-content p {
            font-size: 0.85rem;
            color: var(--text-light);
            line-height: 1.6;
        }

        /* ===== FAQ ===== */
        .faq-section {
            background: var(--white);
            border-radius: var(--radius-xl);
            padding: 60px 48px;
            box-shadow: var(--shadow);
            margin: 40px 0;
        }
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            border: 1px solid var(--gray-200);
            border-radius: var(--radius);
            overflow: hidden;
            transition: border-color var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary-light);
        }
        .faq-item summary {
            padding: 18px 24px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--dark);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            background: var(--gray-50);
            transition: background var(--transition);
            list-style: none;
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary::after {
            content: '\f078';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            font-size: 0.75rem;
            color: var(--gray-400);
            transition: transform var(--transition), color var(--transition);
            flex-shrink: 0;
        }
        .faq-item[open] summary::after {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-item[open] summary {
            background: var(--primary-bg);
            color: var(--primary-dark);
        }
        .faq-item .faq-answer {
            padding: 0 24px 20px;
            font-size: 0.9rem;
            color: var(--text-light);
            line-height: 1.8;
            background: var(--white);
        }
        .faq-item .faq-answer a {
            color: var(--primary);
            font-weight: 500;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--dark);
            border-radius: var(--radius-xl);
            padding: 64px 48px;
            text-align: center;
            margin: 40px 0;
            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: 0.08;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
        }
        .cta-section h2 {
            font-size: 2rem;
            font-weight: 800;
            color: var(--white);
            margin-bottom: 12px;
            letter-spacing: -0.02em;
        }
        .cta-section p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.65);
            max-width: 520px;
            margin: 0 auto 28px;
            line-height: 1.7;
        }
        .cta-section .btn-group {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 600;
            text-decoration: none;
            transition: all var(--transition);
            border: none;
            cursor: pointer;
            line-height: 1.2;
        }
        .btn-primary {
            background: var(--primary);
            color: var(--white);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            color: var(--white);
            transform: translateY(-2px);
            box-shadow: 0 8px 32px rgba(37, 99, 235, 0.30);
        }
        .btn-secondary {
            background: rgba(255, 255, 255, 0.10);
            color: var(--white);
            border: 1px solid rgba(255, 255, 255, 0.15);
        }
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.18);
            color: var(--white);
            transform: translateY(-2px);
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: var(--white);
            transform: translateY(-2px);
        }

        /* ===== Related Links ===== */
        .related-links {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 16px;
            margin-top: 32px;
        }
        .related-links a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 16px 20px;
            background: var(--white);
            border-radius: var(--radius-sm);
            border: 1px solid var(--gray-100);
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--dark);
            text-decoration: none;
            transition: all var(--transition);
        }
        .related-links a:hover {
            background: var(--primary-bg);
            border-color: var(--primary-light);
            color: var(--primary);
            transform: translateY(-2px);
            box-shadow: var(--shadow);
        }
        .related-links a i {
            color: var(--primary);
            font-size: 1rem;
        }

        /* ===== Footer ===== */
        footer {
            background: var(--dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 60px 0 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }
        footer .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        footer .footer-brand .logo {
            font-size: 1.15rem;
            margin-bottom: 12px;
        }
        footer .footer-brand p {
            font-size: 0.85rem;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.5);
            max-width: 300px;
        }
        footer .footer-col h4 {
            font-size: 0.9rem;
            font-weight: 700;
            color: var(--white);
            margin-bottom: 16px;
            letter-spacing: 0.02em;
        }
        footer .footer-col a {
            display: block;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.5);
            text-decoration: none;
            padding: 5px 0;
            transition: color var(--transition), padding-left var(--transition);
        }
        footer .footer-col a:hover {
            color: var(--secondary);
            padding-left: 6px;
        }
        footer .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.35);
        }
        footer .footer-bottom a {
            color: rgba(255, 255, 255, 0.35);
            text-decoration: none;
            transition: color var(--transition);
        }
        footer .footer-bottom a:hover {
            color: var(--secondary);
        }
        footer .footer-bottom-links {
            display: flex;
            gap: 20px;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .category-banner h1 {
                font-size: 2.2rem;
            }
            footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .faq-section {
                padding: 40px 28px;
            }
            .cta-section {
                padding: 48px 28px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --header-height: 64px;
            }
            .nav-links {
                display: none;
            }
            .mobile-tab-bar {
                display: flex;
            }
            header .container {
                justify-content: center;
            }
            .category-banner {
                padding: 100px 0 60px;
                min-height: 260px;
            }
            .category-banner h1 {
                font-size: 1.8rem;
            }
            .category-banner p {
                font-size: 1rem;
            }
            .category-banner .banner-stats {
                gap: 24px;
            }
            .category-banner .banner-stats .stat-number {
                font-size: 1.4rem;
            }
            .guide-grid {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .feature-highlights {
                grid-template-columns: 1fr;
            }
            .section-title h2 {
                font-size: 1.6rem;
            }
            .faq-section {
                padding: 32px 16px;
                border-radius: var(--radius);
            }
            .faq-item summary {
                padding: 14px 16px;
                font-size: 0.9rem;
            }
            .faq-item .faq-answer {
                padding: 0 16px 16px;
                font-size: 0.85rem;
            }
            .cta-section {
                padding: 40px 20px;
                border-radius: var(--radius);
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .cta-section .btn-group {
                flex-direction: column;
            }
            .btn {
                width: 100%;
                justify-content: center;
            }
            footer {
                padding: 40px 0 90px;
            }
            footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            footer .footer-brand p {
                max-width: 100%;
            }
            footer .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .related-links {
                grid-template-columns: 1fr;
            }
            .steps-section {
                padding: 40px 20px;
                border-radius: var(--radius);
            }
            main {
                padding: 40px 0 60px;
            }
        }

        @media (max-width: 520px) {
            .category-banner h1 {
                font-size: 1.4rem;
            }
            .category-banner p {
                font-size: 0.9rem;
            }
            .category-banner .banner-stats {
                gap: 16px;
            }
            .category-banner .banner-stats .stat-number {
                font-size: 1.2rem;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .section-title h2 {
                font-size: 1.3rem;
            }
            .guide-card .card-body {
                padding: 18px 16px 20px;
            }
            .guide-card .card-body h3 {
                font-size: 1rem;
            }
            .feature-item {
                padding: 20px 16px;
                flex-direction: column;
                align-items: center;
                text-align: center;
            }
            .feature-item .f-icon {
                width: 44px;
                height: 44px;
                font-size: 1.2rem;
            }
            .cta-section h2 {
                font-size: 1.2rem;
            }
            .cta-section p {
                font-size: 0.9rem;
            }
            .mobile-tab-bar a {
                font-size: 0.6rem;
                min-width: 48px;
                padding: 4px 8px;
            }
            .mobile-tab-bar a i {
                font-size: 1rem;
            }
            .faq-section {
                padding: 24px 12px;
            }
        }

        /* ===== Accessibility ===== */
        a:focus-visible,
        button:focus-visible,
        summary:focus-visible {
            outline: 2px solid var(--primary-light);
            outline-offset: 2px;
            border-radius: 4px;
        }

        /* ===== Smooth spacing ===== */
        .mt-20 {
            margin-top: 20px;
        }
        .mb-20 {
            margin-bottom: 20px;
        }
        .mt-40 {
            margin-top: 40px;
        }
        .mb-40 {
            margin-bottom: 40px;
        }