/* roulang page: index */
/* ===== Design Variables ===== */
:root {
  --primary: #0f1b3d;
  --primary-light: #1a2d6d;
  --primary-dark: #080f24;
  --accent: #d4273c;
  --accent-light: #ff4d5a;
  --accent-dark: #a81e30;
  --bg: #f8f9fc;
  --bg-alt: #0f1b3d;
  --bg-card: #ffffff;
  --text: #1a1a2e;
  --text-light: #6b7280;
  --text-white: #f0f2f5;
  --border: #e5e7eb;
  --radius: 14px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(0,0,0,0.07);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.12);
  --shadow-hover: 0 12px 40px rgba(0,0,0,0.15);
  --transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --max-width: 1200px;
  --nav-height: 72px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; transition: var(--transition); }
button, input, textarea { font-family: inherit; font-size: inherit; border: none; outline: 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: clamp(2.2rem, 5.5vw, 3.8rem); }
h2 { font-size: clamp(1.6rem, 3.2vw, 2.4rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); }
p { margin-bottom: 1rem; color: var(--text-light); }
.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section-alt { background: var(--bg-alt); color: var(--text-white); }
.section-alt h2, .section-alt h3, .section-alt p { color: var(--text-white); }
.section-alt .text-light { color: rgba(255,255,255,0.7); }
.text-center { text-align: center; }
.section-title { margin-bottom: 16px; }
.section-subtitle { font-size: 1.1rem; color: var(--text-light); max-width: 640px; margin: 0 auto 48px; }
.section-alt .section-subtitle { color: rgba(255,255,255,0.7); }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 32px; border-radius: 50px; font-weight: 600;
  font-size: 1rem; cursor: pointer; transition: var(--transition);
  border: 2px solid transparent; text-align: center;
}
.btn-primary {
  background: var(--accent); color: #fff; border-color: var(--accent);
}
.btn-primary:hover {
  background: var(--accent-dark); border-color: var(--accent-dark);
  transform: translateY(-2px); box-shadow: 0 8px 30px rgba(212,39,60,0.35);
}
.btn-outline {
  background: transparent; color: #fff; border-color: rgba(255,255,255,0.6);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.12); border-color: #fff; transform: translateY(-2px);
}
.btn-ghost {
  background: transparent; color: var(--text); border-color: var(--border);
}
.btn-ghost:hover {
  border-color: var(--accent); color: var(--accent); transform: translateY(-2px);
}
.btn-lg { padding: 16px 44px; font-size: 1.1rem; }
.btn-sm { padding: 8px 20px; font-size: 0.9rem; }

/* ===== Header & Nav ===== */
.header {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
  background: rgba(255,255,255,0.92); backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(0,0,0,0.05);
  height: var(--nav-height); transition: var(--transition);
}
.header.scrolled { box-shadow: 0 2px 30px rgba(0,0,0,0.08); }
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: var(--nav-height); max-width: var(--max-width); margin: 0 auto;
  padding: 0 24px;
}
.logo {
  font-size: 1.5rem; font-weight: 800; color: var(--primary);
  letter-spacing: -0.5px; display: flex; align-items: center; gap: 8px;
}
.logo i { color: var(--accent); font-size: 1.3rem; }
.nav-links { display: flex; align-items: center; gap: 8px; }
.nav-links a {
  padding: 8px 18px; border-radius: 50px; font-weight: 500;
  font-size: 0.95rem; color: var(--text); position: relative;
  transition: var(--transition);
}
.nav-links a:hover { color: var(--accent); background: rgba(212,39,60,0.06); }
.nav-links a.active {
  color: #fff; background: var(--accent);
  box-shadow: 0 4px 16px rgba(212,39,60,0.25);
}
.nav-cta {
  padding: 10px 28px; border-radius: 50px; font-weight: 600;
  font-size: 0.95rem; background: var(--primary); color: #fff;
  border: 2px solid var(--primary); transition: var(--transition);
  display: inline-flex; align-items: center; gap: 8px;
}
.nav-cta:hover {
  background: var(--primary-light); border-color: var(--primary-light);
  transform: translateY(-2px); box-shadow: 0 8px 28px rgba(15,27,61,0.3);
}
.nav-toggle {
  display: none; background: none; font-size: 1.6rem; color: var(--text);
  cursor: pointer; padding: 4px; line-height: 1;
}

/* ===== Hero ===== */
.hero {
  min-height: 100vh; display: flex; align-items: center;
  position: relative; overflow: hidden; padding: 120px 0 80px;
  background: linear-gradient(135deg, #0f1b3d 0%, #1a2d6d 50%, #0f1b3d 100%);
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
  opacity: 0.25; mix-blend-mode: overlay;
}
.hero-overlay {
  position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(135deg, rgba(15,27,61,0.88) 0%, rgba(26,45,109,0.70) 100%);
}
.hero .container { position: relative; z-index: 2; }
.hero-content { max-width: 720px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: rgba(255,255,255,0.1); backdrop-filter: blur(8px);
  padding: 6px 18px; border-radius: 50px; font-size: 0.85rem;
  color: rgba(255,255,255,0.85); margin-bottom: 24px;
  border: 1px solid rgba(255,255,255,0.12);
}
.hero-badge i { color: var(--accent-light); }
.hero h1 { color: #fff; margin-bottom: 20px; letter-spacing: -1px; }
.hero h1 span { color: var(--accent-light); }
.hero p {
  font-size: 1.2rem; color: rgba(255,255,255,0.75);
  max-width: 580px; margin-bottom: 36px; line-height: 1.8;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-stats {
  display: flex; gap: 40px; margin-top: 60px; padding-top: 40px;
  border-top: 1px solid rgba(255,255,255,0.1);
}
.hero-stat h3 { color: #fff; font-size: 1.8rem; margin-bottom: 4px; }
.hero-stat p { font-size: 0.9rem; color: rgba(255,255,255,0.6); margin: 0; }

/* ===== Cards ===== */
.card {
  background: var(--bg-card); border-radius: var(--radius);
  box-shadow: var(--shadow); overflow: hidden;
  transition: var(--transition); border: 1px solid rgba(0,0,0,0.04);
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.card-img { width: 100%; height: 200px; object-fit: cover; }
.card-body { padding: 24px; }
.card-body h3 { margin-bottom: 10px; font-size: 1.15rem; }
.card-body p { font-size: 0.95rem; margin-bottom: 16px; color: var(--text-light); }
.card-tag {
  display: inline-block; padding: 4px 14px; border-radius: 50px;
  font-size: 0.8rem; font-weight: 600; background: rgba(212,39,60,0.08);
  color: var(--accent); margin-bottom: 12px;
}

/* ===== Grid ===== */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 28px; }
.grid-4 { display: grid; grid-template-columns: 1fr 1fr 1fr 1fr; gap: 24px; }

/* ===== Feature / Intro Block ===== */
.feature-block {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px;
  align-items: center;
}
.feature-image { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-lg); }
.feature-image img { width: 100%; height: 400px; object-fit: cover; }
.feature-text h2 { margin-bottom: 16px; }
.feature-text p { font-size: 1.05rem; margin-bottom: 20px; }
.feature-list { display: flex; flex-direction: column; gap: 12px; }
.feature-list li { display: flex; align-items: flex-start; gap: 12px; font-size: 0.98rem; color: var(--text-light); }
.feature-list li i { color: var(--accent); margin-top: 4px; flex-shrink: 0; }

/* ===== Steps ===== */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; counter-reset: step; }
.step-card {
  background: var(--bg-card); border-radius: var(--radius); padding: 32px 24px;
  text-align: center; box-shadow: var(--shadow); border: 1px solid rgba(0,0,0,0.04);
  transition: var(--transition); position: relative;
}
.step-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.step-number {
  width: 52px; height: 52px; border-radius: 50%; display: flex; align-items: center;
  justify-content: center; font-size: 1.4rem; font-weight: 800; margin: 0 auto 16px;
  background: var(--primary); color: #fff;
}
.step-card h4 { margin-bottom: 8px; font-size: 1.05rem; }
.step-card p { font-size: 0.92rem; margin: 0; }

/* ===== Stats ===== */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat-card {
  text-align: center; padding: 32px 16px;
  background: rgba(255,255,255,0.05); border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,0.08);
  transition: var(--transition);
}
.stat-card:hover { background: rgba(255,255,255,0.1); transform: translateY(-4px); }
.stat-card i { font-size: 2.2rem; color: var(--accent-light); margin-bottom: 12px; }
.stat-card h3 { color: #fff; font-size: 2.2rem; margin-bottom: 4px; }
.stat-card p { color: rgba(255,255,255,0.65); font-size: 0.95rem; margin: 0; }

/* ===== 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-sm);
  border: 1px solid var(--border); overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover { border-color: rgba(212,39,60,0.2); }
.faq-question {
  padding: 18px 24px; font-weight: 600; font-size: 1rem;
  display: flex; justify-content: space-between; align-items: center;
  cursor: pointer; background: none; width: 100%; text-align: left;
  color: var(--text); transition: var(--transition);
}
.faq-question:hover { color: var(--accent); }
.faq-question i { transition: var(--transition); font-size: 0.9rem; color: var(--text-light); }
.faq-item.active .faq-question i { transform: rotate(180deg); color: var(--accent); }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.3s ease;
  padding: 0 24px; color: var(--text-light); font-size: 0.95rem;
}
.faq-item.active .faq-answer {
  max-height: 300px; padding: 0 24px 20px;
}

/* ===== CTA ===== */
.cta-section {
  background: linear-gradient(135deg, #0f1b3d 0%, #1a2d6d 100%);
  padding: 80px 0; text-align: center; 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: 0.1; mix-blend-mode: overlay;
}
.cta-section .container { position: relative; z-index: 1; }
.cta-section h2 { color: #fff; font-size: clamp(1.8rem, 3vw, 2.6rem); margin-bottom: 16px; }
.cta-section p { color: rgba(255,255,255,0.7); font-size: 1.1rem; max-width: 560px; margin: 0 auto 32px; }
.cta-section .btn { font-size: 1.1rem; }

/* ===== News List (CMS) ===== */
.news-list { display: grid; grid-template-columns: 1fr; gap: 16px; }
.news-item {
  display: flex; align-items: center; gap: 20px;
  background: var(--bg-card); border-radius: var(--radius-sm);
  padding: 20px 24px; box-shadow: var(--shadow);
  border: 1px solid rgba(0,0,0,0.04); transition: var(--transition);
}
.news-item:hover { transform: translateX(6px); box-shadow: var(--shadow-hover); }
.news-cat {
  flex-shrink: 0; padding: 4px 14px; border-radius: 50px;
  font-size: 0.78rem; font-weight: 600; background: rgba(212,39,60,0.08);
  color: var(--accent);
}
.news-title { flex: 1; font-weight: 600; font-size: 1rem; color: var(--text); }
.news-title a { color: inherit; }
.news-title a:hover { color: var(--accent); }
.news-date { flex-shrink: 0; font-size: 0.85rem; color: var(--text-light); }
.news-empty {
  text-align: center; padding: 40px 20px; color: var(--text-light);
  background: var(--bg-card); border-radius: var(--radius-sm);
  border: 1px dashed var(--border);
}

/* ===== Category Cards ===== */
.category-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.category-card {
  background: var(--bg-card); border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); border: 1px solid rgba(0,0,0,0.04);
  transition: var(--transition); position: relative;
}
.category-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.category-card img { width: 100%; height: 180px; object-fit: cover; }
.category-card-body { padding: 20px; }
.category-card-body h3 { font-size: 1.1rem; margin-bottom: 6px; }
.category-card-body p { font-size: 0.9rem; margin-bottom: 12px; color: var(--text-light); }
.category-card .btn-sm { margin-top: 4px; }

/* ===== Footer ===== */
.footer {
  background: var(--primary-dark); color: rgba(255,255,255,0.7);
  padding: 60px 0 30px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .logo { color: #fff; font-size: 1.4rem; margin-bottom: 12px; display: inline-flex; }
.footer-brand p { font-size: 0.95rem; color: rgba(255,255,255,0.55); max-width: 280px; }
.footer-col h4 { color: #fff; font-size: 1rem; margin-bottom: 16px; font-weight: 600; }
.footer-col a {
  display: block; font-size: 0.92rem; color: rgba(255,255,255,0.6);
  padding: 4px 0; transition: var(--transition);
}
.footer-col a:hover { color: var(--accent-light); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08); padding-top: 24px;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 12px; font-size: 0.9rem;
}
.footer-bottom p { margin: 0; color: rgba(255,255,255,0.45); }
.footer-socials { display: flex; gap: 12px; }
.footer-socials a {
  width: 40px; height: 40px; border-radius: 50%;
  background: rgba(255,255,255,0.06); display: flex; align-items: center;
  justify-content: center; color: rgba(255,255,255,0.6); font-size: 1.1rem;
  transition: var(--transition);
}
.footer-socials a:hover { background: var(--accent); color: #fff; transform: translateY(-3px); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-cta { display: none; }
  .nav-toggle { display: block; }
  .nav-links.open {
    display: flex; flex-direction: column; position: absolute; top: var(--nav-height);
    left: 0; width: 100%; background: rgba(255,255,255,0.98);
    backdrop-filter: blur(16px); padding: 16px 24px 24px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1); border-radius: 0 0 16px 16px;
    gap: 6px;
  }
  .nav-links.open a { padding: 12px 18px; width: 100%; }
  .nav-mobile-cta {
    display: block; margin-top: 12px; width: 100%; text-align: center;
  }
  .hero { min-height: auto; padding: 100px 0 60px; }
  .hero h1 { font-size: 2rem; }
  .hero p { font-size: 1rem; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .hero-stat h3 { font-size: 1.4rem; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .feature-block { grid-template-columns: 1fr; gap: 32px; }
  .feature-image img { height: 240px; }
  .section { padding: 50px 0; }
  .steps { grid-template-columns: 1fr 1fr; gap: 16px; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
  .category-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .news-item { flex-direction: column; align-items: flex-start; gap: 8px; }
  .news-date { align-self: flex-end; }
}

@media (max-width: 520px) {
  .container { padding: 0 16px; }
  .hero h1 { font-size: 1.6rem; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .steps { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr; }
  .hero-stats { flex-direction: column; gap: 16px; }
  .section-title { font-size: 1.4rem; }
  .nav-links.open { padding: 12px 16px 20px; }
}

/* ===== Utility ===== */
.gap-16 { gap: 16px; }
.mt-16 { margin-top: 16px; }
.mt-32 { margin-top: 32px; }
.mb-16 { margin-bottom: 16px; }
.mb-32 { margin-bottom: 32px; }
.flex-center { display: flex; align-items: center; justify-content: center; }

/* roulang page: category1 */
:root {
  --primary: #1a56db;
  --primary-dark: #1443b0;
  --primary-light: #e8effd;
  --secondary: #f59e0b;
  --secondary-light: #fef3c7;
  --accent: #06b6d4;
  --bg-body: #f8fafc;
  --bg-white: #ffffff;
  --bg-dark: #0f172a;
  --bg-card: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-white: #ffffff;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --radius: 12px;
  --radius-lg: 20px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0,0,0,0.06);
  --shadow-lg: 0 12px 48px rgba(0,0,0,0.10);
  --shadow-hover: 0 16px 48px rgba(0,0,0,0.12);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --container: 1200px;
  --header-h: 72px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--bg-body);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; height: auto; display: block; }
button, input, select, textarea { font-family: inherit; font-size: inherit; }
ul, ol { list-style: none; }
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* header */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  height: var(--header-h);
  transition: var(--transition);
}
.header.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,0.06); }
.nav {
  max-width: var(--container); margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
  height: var(--header-h);
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 22px; font-weight: 800; color: var(--text-primary);
  letter-spacing: -0.5px;
}
.logo i { color: var(--primary); font-size: 26px; }
.logo:hover { color: var(--primary); }
.nav-links { display: flex; align-items: center; gap: 8px; }
.nav-links a {
  padding: 8px 18px; border-radius: var(--radius-sm);
  font-size: 15px; font-weight: 500; color: var(--text-secondary);
  transition: var(--transition); position: relative;
}
.nav-links a:hover { color: var(--primary); background: var(--primary-light); }
.nav-links a.active { color: var(--primary); background: var(--primary-light); font-weight: 600; }
.nav-cta {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 24px; border-radius: var(--radius-sm);
  background: var(--primary); color: var(--text-white);
  font-weight: 600; font-size: 15px;
  transition: var(--transition); box-shadow: 0 4px 14px rgba(26,86,219,0.30);
}
.nav-cta:hover { background: var(--primary-dark); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(26,86,219,0.40); }
.nav-toggle { display: none; background: none; border: none; font-size: 24px; color: var(--text-primary); cursor: pointer; padding: 6px; border-radius: 6px; }
.nav-toggle:hover { background: var(--border-light); }

/* page banner */
.page-banner {
  position: relative; padding: 140px 0 80px; margin-top: var(--header-h);
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
  overflow: hidden; min-height: 320px; display: flex; align-items: center;
}
.page-banner::before {
  content: ''; position: absolute; inset: 0;
  background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  opacity: 0.20; mix-blend-mode: overlay;
}
.page-banner::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 120px;
  background: linear-gradient(to top, var(--bg-body), transparent);
}
.page-banner .container { position: relative; z-index: 2; text-align: center; }
.page-banner h1 {
  font-size: 44px; font-weight: 800; color: var(--text-white);
  letter-spacing: -1px; line-height: 1.2; margin-bottom: 16px;
}
.page-banner p {
  font-size: 18px; color: rgba(255,255,255,0.75); max-width: 680px; margin: 0 auto 24px;
  line-height: 1.7;
}
.page-banner .breadcrumb {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  font-size: 14px; color: rgba(255,255,255,0.5); margin-bottom: 20px;
}
.page-banner .breadcrumb a { color: rgba(255,255,255,0.7); }
.page-banner .breadcrumb a:hover { color: #fff; }
.page-banner .breadcrumb span { color: var(--secondary); }

/* section */
.section { padding: 80px 0; }
.section-alt { background: var(--bg-white); }
.section-dark { background: var(--bg-dark); color: var(--text-white); }
.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 {
  font-size: 34px; font-weight: 800; letter-spacing: -0.5px;
  margin-bottom: 12px; color: var(--text-primary);
}
.section-header p { font-size: 17px; color: var(--text-secondary); max-width: 600px; margin: 0 auto; line-height: 1.7; }
.section-header.light h2 { color: var(--text-white); }
.section-header.light p { color: rgba(255,255,255,0.7); }

/* guide steps */
.guide-steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 32px; counter-reset: step; }
.guide-card {
  background: var(--bg-card); border-radius: var(--radius);
  padding: 36px 28px; border: 1px solid var(--border);
  transition: var(--transition); position: relative;
  box-shadow: var(--shadow);
}
.guide-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); border-color: var(--primary-light); }
.guide-card .step-num {
  counter-increment: step; font-size: 48px; font-weight: 800;
  color: var(--primary-light); line-height: 1; margin-bottom: 12px;
  display: block;
}
.guide-card .step-num::before { content: counter(step); }
.guide-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; color: var(--text-primary); }
.guide-card p { font-size: 15px; color: var(--text-secondary); line-height: 1.7; }

/* feature cards */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 28px; }
.feature-card {
  background: var(--bg-card); border-radius: var(--radius);
  overflow: hidden; border: 1px solid var(--border);
  transition: var(--transition); box-shadow: var(--shadow);
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.feature-card .card-img {
  height: 200px; background: var(--border-light); overflow: hidden;
  position: relative;
}
.feature-card .card-img img { width: 100%; height: 100%; object-fit: cover; transition: var(--transition); }
.feature-card:hover .card-img img { transform: scale(1.05); }
.feature-card .card-body { padding: 24px 24px 28px; }
.feature-card .card-body h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; color: var(--text-primary); }
.feature-card .card-body p { font-size: 15px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 16px; }
.feature-card .card-tag {
  display: inline-block; padding: 4px 14px; border-radius: 20px;
  font-size: 12px; font-weight: 600; background: var(--primary-light); color: var(--primary);
}

/* info blocks */
.info-blocks { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; }
.info-block {
  background: rgba(255,255,255,0.05); border-radius: var(--radius);
  padding: 32px 24px; border: 1px solid rgba(255,255,255,0.08);
  transition: var(--transition); text-align: center;
}
.info-block:hover { background: rgba(255,255,255,0.08); transform: translateY(-4px); }
.info-block i { font-size: 36px; color: var(--secondary); margin-bottom: 16px; }
.info-block h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; color: var(--text-white); }
.info-block p { font-size: 14px; color: rgba(255,255,255,0.65); line-height: 1.7; }

/* faq */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
.faq-item {
  background: var(--bg-card); border-radius: var(--radius);
  border: 1px solid var(--border); overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover { border-color: var(--primary-light); }
.faq-question {
  padding: 20px 24px; display: flex; align-items: center; justify-content: space-between;
  cursor: pointer; font-size: 16px; font-weight: 600; color: var(--text-primary);
  background: none; border: none; width: 100%; text-align: left;
  transition: var(--transition); gap: 16px;
}
.faq-question i { font-size: 18px; color: var(--primary); transition: var(--transition); flex-shrink: 0; }
.faq-item.active .faq-question i { transform: rotate(180deg); }
.faq-answer {
  padding: 0 24px 20px; font-size: 15px; color: var(--text-secondary);
  line-height: 1.8; display: none;
}
.faq-item.active .faq-answer { display: block; }

/* cta */
.cta-section {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  padding: 72px 0; text-align: center; position: relative; overflow: hidden;
}
.cta-section::before {
  content: ''; position: absolute; inset: 0;
  background: url('/assets/images/backpic/back-3.png') center/cover no-repeat;
  opacity: 0.08; mix-blend-mode: overlay;
}
.cta-section .container { position: relative; z-index: 2; }
.cta-section h2 { font-size: 36px; font-weight: 800; color: #fff; margin-bottom: 12px; }
.cta-section p { font-size: 18px; color: rgba(255,255,255,0.8); margin-bottom: 32px; max-width: 560px; margin-left: auto; margin-right: auto; }
.cta-btns { 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: 16px; font-weight: 600; border: none; cursor: pointer;
  transition: var(--transition); text-decoration: none;
}
.btn-primary { background: #fff; color: var(--primary); box-shadow: 0 4px 14px rgba(0,0,0,0.10); }
.btn-primary:hover { background: var(--secondary); color: #fff; transform: translateY(-3px); box-shadow: 0 8px 28px rgba(0,0,0,0.15); }
.btn-outline { background: transparent; color: #fff; border: 2px solid rgba(255,255,255,0.4); }
.btn-outline:hover { border-color: #fff; background: rgba(255,255,255,0.10); transform: translateY(-3px); }
.btn-sm { padding: 10px 20px; font-size: 14px; }

/* footer */
.footer {
  background: var(--bg-dark); color: rgba(255,255,255,0.7);
  padding: 60px 0 0;
}
.footer .logo { color: #fff; margin-bottom: 16px; }
.footer .logo i { color: var(--secondary); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand p { font-size: 14px; line-height: 1.8; color: rgba(255,255,255,0.5); margin-top: 8px; }
.footer-col h4 { font-size: 16px; font-weight: 700; color: #fff; margin-bottom: 16px; }
.footer-col a { display: block; font-size: 14px; color: rgba(255,255,255,0.55); margin-bottom: 10px; transition: var(--transition); }
.footer-col a:hover { color: var(--secondary); padding-left: 4px; }
.footer-socials { display: flex; gap: 14px; }
.footer-socials a { font-size: 20px; color: rgba(255,255,255,0.4); margin-bottom: 0; }
.footer-socials a:hover { color: var(--secondary); padding-left: 0; transform: scale(1.15); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 24px 0; display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 12px;
  font-size: 13px; color: rgba(255,255,255,0.35);
}
.footer-bottom i { color: var(--secondary); margin-right: 4px; }

/* responsive */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 768px) {
  .nav-links {
    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: 16px 24px 24px;
    box-shadow: 0 12px 40px rgba(0,0,0,0.10);
    transform: translateY(-120%); opacity: 0; pointer-events: none;
    transition: var(--transition); border-bottom: 1px solid var(--border);
    gap: 4px;
  }
  .nav-links.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav-links a { width: 100%; padding: 14px 18px; font-size: 16px; }
  .nav-cta { display: none; }
  .nav-toggle { display: flex; align-items: center; justify-content: center; }
  #mobileCta { display: flex !important; margin-top: 8px; justify-content: center; }

  .page-banner { padding: 120px 0 60px; min-height: 260px; }
  .page-banner h1 { font-size: 30px; }
  .page-banner p { font-size: 16px; }

  .section { padding: 56px 0; }
  .section-header h2 { font-size: 28px; }
  .section-header p { font-size: 15px; }

  .guide-steps { grid-template-columns: 1fr; gap: 20px; }
  .feature-grid { grid-template-columns: 1fr; gap: 20px; }
  .info-blocks { grid-template-columns: 1fr 1fr; gap: 16px; }

  .cta-section { padding: 52px 0; }
  .cta-section h2 { font-size: 28px; }
  .cta-section p { font-size: 16px; }
  .cta-btns { flex-direction: column; }
  .cta-btns .btn { width: 100%; justify-content: center; }

  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 520px) {
  .nav { padding: 0 16px; }
  .logo { font-size: 18px; }
  .logo i { font-size: 20px; }

  .page-banner h1 { font-size: 24px; }
  .page-banner p { font-size: 14px; }

  .section-header h2 { font-size: 24px; }
  .info-blocks { grid-template-columns: 1fr; }

  .guide-card { padding: 24px 20px; }
  .feature-card .card-body { padding: 18px 18px 22px; }

  .faq-question { font-size: 15px; padding: 16px 18px; }
  .faq-answer { font-size: 14px; padding: 0 18px 16px; }
}

/* roulang page: article */
/* ===== Design Variables ===== */
:root {
  --primary: #0a2e5c;
  --primary-light: #124a8a;
  --primary-dark: #061b36;
  --accent: #f0b429;
  --accent-light: #f7d06a;
  --accent-dark: #c9940a;
  --bg-body: #f4f7fb;
  --bg-white: #ffffff;
  --bg-card: #ffffff;
  --bg-dark: #0a1628;
  --bg-section-alt: #e8edf5;
  --text-dark: #0f172a;
  --text-body: #1e293b;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --text-white: #f1f5f9;
  --border-color: #dce3ed;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;
  --shadow-sm: 0 2px 8px rgba(10, 30, 60, 0.06);
  --shadow-md: 0 8px 28px rgba(10, 30, 60, 0.08);
  --shadow-lg: 0 18px 48px rgba(10, 30, 60, 0.12);
  --shadow-glow: 0 0 30px rgba(10, 46, 92, 0.08);
  --transition: 0.32s cubic-bezier(0.22, 0.61, 0.36, 1);
  --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-body);
  background: var(--bg-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent-dark); }
img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
button, input, textarea { font-family: inherit; font-size: inherit; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { line-height: 1.25; color: var(--text-dark); font-weight: 700; }
h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
h2 { font-size: clamp(1.6rem, 3.6vw, 2.4rem); margin-bottom: 0.5em; }
h3 { font-size: clamp(1.2rem, 2.4vw, 1.6rem); }
p { margin-bottom: 1em; }
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 12px 30px;
  font-weight: 600; font-size: 0.95rem; border-radius: var(--radius-md);
  border: 2px solid transparent; cursor: pointer; transition: var(--transition);
  text-align: center; justify-content: center; line-height: 1.4;
}
.btn-primary {
  background: var(--accent); color: var(--primary-dark); border-color: var(--accent);
}
.btn-primary:hover { background: var(--accent-light); border-color: var(--accent-light); color: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(240, 180, 41, 0.3); }
.btn-outline {
  background: transparent; color: var(--text-white); border-color: rgba(255,255,255,0.4);
}
.btn-outline:hover { background: rgba(255,255,255,0.12); border-color: var(--text-white); color: var(--text-white); transform: translateY(-2px); }
.btn-sm { padding: 8px 20px; font-size: 0.85rem; border-radius: var(--radius-sm); }
.btn-link {
  background: transparent; border: none; color: var(--primary); padding: 4px 0; gap: 4px;
  font-weight: 600; border-radius: 0; border-bottom: 2px solid transparent;
}
.btn-link:hover { color: var(--accent-dark); border-bottom-color: var(--accent); transform: none; box-shadow: none; }

/* ===== Tags / Badges ===== */
.tag {
  display: inline-block; padding: 4px 14px; border-radius: 50px; font-size: 0.78rem;
  font-weight: 500; background: rgba(10, 46, 92, 0.08); color: var(--primary);
  border: 1px solid rgba(10, 46, 92, 0.12); transition: var(--transition);
}
.tag-accent { background: var(--accent); color: var(--primary-dark); border-color: var(--accent); font-weight: 600; }
.tag-sm { padding: 2px 10px; font-size: 0.7rem; }

/* ===== Header & Nav ===== */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(10, 46, 92, 0.92); backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px); border-bottom: 1px solid rgba(255,255,255,0.06);
  box-shadow: 0 2px 20px rgba(0,0,0,0.15); height: 72px;
}
.nav {
  max-width: 1200px; margin: 0 auto; padding: 0 24px; height: 72px;
  display: flex; align-items: center; justify-content: space-between;
}
.logo {
  display: flex; align-items: center; gap: 10px; font-size: 1.4rem; font-weight: 800;
  color: var(--text-white); letter-spacing: -0.3px;
}
.logo i { color: var(--accent); font-size: 1.6rem; }
.logo:hover { color: var(--accent); }
.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-links a {
  padding: 8px 18px; border-radius: var(--radius-sm); font-weight: 500;
  color: rgba(255,255,255,0.75); font-size: 0.9rem; transition: var(--transition);
  white-space: nowrap;
}
.nav-links a:hover { color: var(--text-white); background: rgba(255,255,255,0.08); }
.nav-links a.active { color: var(--text-white); background: rgba(240, 180, 41, 0.18); }
.nav-cta {
  display: inline-flex; align-items: center; gap: 8px; padding: 10px 26px;
  background: var(--accent); color: var(--primary-dark); border-radius: var(--radius-md);
  font-weight: 700; font-size: 0.9rem; transition: var(--transition);
  white-space: nowrap; border: none; cursor: pointer;
}
.nav-cta:hover { background: var(--accent-light); color: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(240,180,41,0.3); }
.nav-cta i { font-size: 0.85rem; }
.nav-toggle { display: none; background: none; border: none; color: var(--text-white); font-size: 1.5rem; cursor: pointer; padding: 6px; border-radius: var(--radius-sm); }
.nav-toggle:hover { background: rgba(255,255,255,0.08); }

/* ===== Article Hero ===== */
.article-hero {
  position: relative; margin-top: 72px; min-height: 380px;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-dark) url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
  overflow: hidden;
}
.article-hero::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(10, 22, 40, 0.88) 0%, rgba(10, 46, 92, 0.72) 60%, rgba(6, 27, 54, 0.90) 100%);
  z-index: 1;
}
.article-hero::after {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(240, 180, 41, 0.06) 0%, transparent 70%);
  z-index: 1;
}
.article-hero .container { position: relative; z-index: 2; text-align: center; padding: 60px 24px 50px; }
.article-breadcrumb {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  margin-bottom: 20px; font-size: 0.85rem; color: rgba(255,255,255,0.5);
}
.article-breadcrumb a { color: rgba(255,255,255,0.6); }
.article-breadcrumb a:hover { color: var(--accent); }
.article-breadcrumb span { color: rgba(255,255,255,0.35); }
.article-category-tag {
  display: inline-block; padding: 6px 20px; border-radius: 50px;
  background: rgba(240, 180, 41, 0.18); color: var(--accent); font-size: 0.82rem;
  font-weight: 600; letter-spacing: 0.3px; margin-bottom: 18px; border: 1px solid rgba(240,180,41,0.15);
}
.article-hero h1 {
  color: var(--text-white); max-width: 860px; margin: 0 auto 16px;
  font-weight: 800; letter-spacing: -0.4px; text-shadow: 0 2px 16px rgba(0,0,0,0.2);
}
.article-meta {
  display: flex; align-items: center; justify-content: center; gap: 20px;
  flex-wrap: wrap; color: rgba(255,255,255,0.55); font-size: 0.88rem; margin-top: 6px;
}
.article-meta i { margin-right: 5px; color: var(--accent); opacity: 0.7; }

/* ===== Article Content ===== */
.article-section { padding: 60px 0 30px; }
.article-layout {
  display: grid; grid-template-columns: 1fr 320px; gap: 48px;
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
}
.article-main {
  background: var(--bg-card); border-radius: var(--radius-lg); padding: 40px 44px;
  box-shadow: var(--shadow-sm); border: 1px solid var(--border-color);
}
.article-body { font-size: 1.02rem; line-height: 1.85; color: var(--text-body); }
.article-body h2 { margin-top: 2em; margin-bottom: 0.6em; font-weight: 700; }
.article-body h3 { margin-top: 1.6em; margin-bottom: 0.4em; font-weight: 600; }
.article-body p { margin-bottom: 1.2em; }
.article-body ul, .article-body ol { margin-bottom: 1.2em; padding-left: 1.6em; list-style: disc; }
.article-body li { margin-bottom: 0.3em; }
.article-body img { border-radius: var(--radius-md); margin: 1.5em 0; box-shadow: var(--shadow-sm); }
.article-body blockquote {
  border-left: 4px solid var(--accent); padding: 0.8em 1.2em; margin: 1.2em 0;
  background: rgba(240, 180, 41, 0.06); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-muted); font-style: italic;
}
.article-body a { color: var(--primary); border-bottom: 1px solid rgba(10, 46, 92, 0.15); font-weight: 500; }
.article-body a:hover { color: var(--accent-dark); border-bottom-color: var(--accent); }

/* ===== Sidebar ===== */
.article-sidebar { display: flex; flex-direction: column; gap: 28px; }
.sidebar-card {
  background: var(--bg-card); border-radius: var(--radius-md); padding: 28px 24px;
  box-shadow: var(--shadow-sm); border: 1px solid var(--border-color);
}
.sidebar-card h3 { font-size: 1.05rem; margin-bottom: 16px; color: var(--text-dark); display: flex; align-items: center; gap: 8px; }
.sidebar-card h3 i { color: var(--accent); }
.sidebar-list a {
  display: flex; align-items: flex-start; gap: 12px; padding: 10px 0;
  border-bottom: 1px solid var(--border-color); transition: var(--transition);
}
.sidebar-list a:last-child { border-bottom: none; }
.sidebar-list a:hover { padding-left: 6px; }
.sidebar-list .thumb {
  width: 60px; height: 60px; border-radius: var(--radius-sm); object-fit: cover; flex-shrink: 0;
  background: var(--bg-section-alt);
}
.sidebar-list .info { flex: 1; }
.sidebar-list .info h4 { font-size: 0.88rem; font-weight: 600; color: var(--text-dark); line-height: 1.4; margin-bottom: 4px; }
.sidebar-list .info span { font-size: 0.75rem; color: var(--text-muted); }
.sidebar-cta { text-align: center; }
.sidebar-cta .btn { width: 100%; }

/* ===== Tags & Share ===== */
.article-footer-extras {
  max-width: 1200px; margin: 0 auto; padding: 12px 24px 0;
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px;
}
.article-tags { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.article-tags span { font-size: 0.85rem; color: var(--text-muted); font-weight: 500; }
.article-share { display: flex; align-items: center; gap: 10px; }
.article-share span { font-size: 0.85rem; color: var(--text-muted); font-weight: 500; }
.article-share a {
  width: 36px; height: 36px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  background: var(--bg-section-alt); color: var(--text-muted); font-size: 0.95rem;
  transition: var(--transition); border: 1px solid var(--border-color);
}
.article-share a:hover { background: var(--primary); color: var(--text-white); border-color: var(--primary); transform: translateY(-2px); }

/* ===== Related Posts ===== */
.related-section { padding: 48px 0; }
.related-section h2 { text-align: center; margin-bottom: 36px; }
.related-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 24px;
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
}
.related-card {
  background: var(--bg-card); border-radius: var(--radius-md); overflow: hidden;
  box-shadow: var(--shadow-sm); border: 1px solid var(--border-color);
  transition: var(--transition);
}
.related-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.related-card img { width: 100%; height: 180px; object-fit: cover; border-radius: 0; }
.related-card .body { padding: 18px 20px 22px; }
.related-card .body h3 { font-size: 1rem; font-weight: 600; margin-bottom: 6px; }
.related-card .body p { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 8px; }
.related-card .body .tag { font-size: 0.7rem; }

/* ===== CTA Section ===== */
.cta-section {
  padding: 70px 0; background: var(--bg-dark) url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
  position: relative;
}
.cta-section::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(10, 22, 40, 0.88) 0%, rgba(10, 46, 92, 0.80) 100%);
}
.cta-section .container { position: relative; z-index: 2; text-align: center; }
.cta-section h2 { color: var(--text-white); margin-bottom: 12px; }
.cta-section p { color: rgba(255,255,255,0.65); max-width: 620px; margin: 0 auto 28px; font-size: 1.05rem; }
.cta-section .btn { padding: 16px 44px; font-size: 1.05rem; }

/* ===== FAQ ===== */
.faq-section { padding: 60px 0 40px; }
.faq-section h2 { text-align: center; margin-bottom: 40px; }
.faq-grid {
  max-width: 800px; margin: 0 auto; padding: 0 24px;
  display: flex; flex-direction: column; gap: 12px;
}
.faq-item {
  background: var(--bg-card); border-radius: var(--radius-md); padding: 0 24px;
  border: 1px solid var(--border-color); box-shadow: var(--shadow-sm);
  transition: var(--transition); overflow: hidden;
}
.faq-item summary {
  padding: 18px 0; cursor: pointer; font-weight: 600; color: var(--text-dark);
  font-size: 1rem; display: flex; align-items: center; justify-content: space-between;
  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: 0.8rem; color: var(--text-muted); transition: var(--transition);
}
.faq-item[open] summary::after { transform: rotate(180deg); color: var(--accent); }
.faq-item .answer { padding: 0 0 20px; color: var(--text-muted); font-size: 0.95rem; line-height: 1.7; }

/* ===== Footer ===== */
.footer {
  background: var(--bg-dark); color: rgba(255,255,255,0.6); padding: 60px 0 28px;
  border-top: 1px solid rgba(255,255,255,0.04);
}
.footer .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.footer-grid { display: grid; grid-template-columns: 1.8fr 1fr 1fr 1.2fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .logo { color: var(--text-white); font-size: 1.3rem; margin-bottom: 14px; display: inline-flex; }
.footer-brand p { font-size: 0.88rem; line-height: 1.6; color: rgba(255,255,255,0.45); max-width: 320px; }
.footer-col h4 { color: var(--text-white); font-size: 1rem; margin-bottom: 16px; font-weight: 600; }
.footer-col a { display: block; color: rgba(255,255,255,0.5); font-size: 0.88rem; padding: 4px 0; transition: var(--transition); }
.footer-col a:hover { color: var(--accent); padding-left: 4px; }
.footer-socials { display: flex; gap: 12px; }
.footer-socials a { width: 38px; height: 38px; border-radius: 50%; background: rgba(255,255,255,0.06); display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,0.5); font-size: 1.1rem; padding: 0; }
.footer-socials a:hover { background: var(--accent); color: var(--primary-dark); padding: 0; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06); padding-top: 22px; margin-top: 18px;
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  font-size: 0.82rem; color: rgba(255,255,255,0.35);
}
.footer-bottom i { color: var(--accent); opacity: 0.6; margin-right: 4px; }

/* ===== 404 / Not Found ===== */
.not-found-box {
  text-align: center; padding: 80px 24px; max-width: 560px; margin: 0 auto;
}
.not-found-box i { font-size: 3.6rem; color: var(--text-muted); margin-bottom: 20px; opacity: 0.3; }
.not-found-box h2 { font-size: 1.8rem; margin-bottom: 10px; }
.not-found-box p { color: var(--text-muted); margin-bottom: 24px; }

/* ===== Back to Top ===== */
.back-top { position: fixed; bottom: 32px; right: 32px; z-index: 999; width: 46px; height: 46px; border-radius: 50%; background: var(--primary); color: var(--text-white); border: none; font-size: 1.2rem; cursor: pointer; box-shadow: var(--shadow-md); transition: var(--transition); display: flex; align-items: center; justify-content: center; }
.back-top:hover { background: var(--accent); color: var(--primary-dark); transform: translateY(-4px); box-shadow: var(--shadow-lg); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .article-layout { grid-template-columns: 1fr; }
  .article-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
}
@media (max-width: 768px) {
  .nav-links { display: none; flex-direction: column; position: absolute; top: 72px; left: 0; right: 0; background: rgba(10, 22, 40, 0.98); backdrop-filter: blur(14px); padding: 14px 20px 20px; border-bottom: 1px solid rgba(255,255,255,0.06); }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 16px; font-size: 1rem; }
  .nav-cta { display: none; }
  .nav-mobile-cta { display: flex !important; margin-top: 8px; justify-content: center; }
  .nav-toggle { display: block; }
  .article-hero { min-height: 280px; }
  .article-hero h1 { font-size: 1.6rem; }
  .article-main { padding: 24px 20px; }
  .article-sidebar { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}
@media (max-width: 520px) {
  .article-hero { min-height: 220px; margin-top: 64px; }
  .article-hero .container { padding: 40px 16px 30px; }
  .article-hero h1 { font-size: 1.3rem; }
  .article-meta { font-size: 0.78rem; gap: 10px; }
  .related-grid { grid-template-columns: 1fr; }
  .article-main { padding: 18px 14px; }
  .cta-section { padding: 48px 0; }
  .cta-section h2 { font-size: 1.3rem; }
  .faq-item { padding: 0 16px; }
  .back-top { bottom: 20px; right: 20px; width: 40px; height: 40px; font-size: 1rem; }
}