/* roulang page: index */
/* ===== CSS 设计变量 ===== */
:root {
  --primary: #0d0d1a;
  --primary-light: #1a1a2e;
  --primary-mid: #2a2a4a;
  --accent: #f0b830;
  --accent-hover: #d4a020;
  --accent-light: rgba(240, 184, 48, 0.15);
  --text: #1a1a2e;
  --text-light: #6b7280;
  --text-white: #ffffff;
  --text-muted: #9ca3af;
  --bg: #ffffff;
  --bg-alt: #f8f9fa;
  --bg-dark: #0d0d1a;
  --bg-card: #ffffff;
  --border: #e5e7eb;
  --border-light: rgba(255,255,255,0.1);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 48px rgba(0,0,0,0.12);
  --shadow-accent: 0 8px 32px rgba(240, 184, 48, 0.3);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --container: 1200px;
  --nav-height: 72px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent); }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
button { font-family: inherit; cursor: pointer; border: none; background: none; font-size: inherit; }
button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
input, textarea { font-family: inherit; font-size: inherit; }
ul, ol { list-style: none; }

/* ===== Container ===== */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
@media (max-width: 768px) {
  .container { padding: 0 16px; }
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 { line-height: 1.2; font-weight: 700; color: var(--text); }
h1 { font-size: 3rem; letter-spacing: -0.02em; }
h2 { font-size: 2.25rem; letter-spacing: -0.01em; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
p { margin-bottom: 1rem; color: var(--text-light); }
.section-label {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 12px;
}
.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--text);
}
.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-light);
  max-width: 640px;
  margin-bottom: 40px;
}
@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.75rem; }
  .section-title { font-size: 1.75rem; }
  .section-subtitle { font-size: 1rem; }
}

/* ===== Button ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  border: 2px solid transparent;
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent);
  color: var(--primary);
  border-color: var(--accent);
}
.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-accent);
}
.btn-outline {
  background: transparent;
  color: var(--text-white);
  border-color: rgba(255,255,255,0.3);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: var(--text-white);
  color: var(--text-white);
  transform: translateY(-2px);
}
.btn-light {
  background: var(--text-white);
  color: var(--primary);
  border-color: var(--text-white);
}
.btn-light:hover {
  background: var(--bg-alt);
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.btn-sm { padding: 10px 20px; font-size: 0.875rem; }
.btn-lg { padding: 18px 40px; font-size: 1.125rem; }
@media (max-width: 520px) {
  .btn { padding: 12px 24px; font-size: 0.9rem; }
  .btn-lg { padding: 14px 28px; font-size: 1rem; }
}

/* ===== Header & Navigation ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  background: rgba(13, 13, 26, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
  z-index: 1000;
  transition: var(--transition);
}
.header.scrolled { background: rgba(13, 13, 26, 0.98); }
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-white);
  letter-spacing: -0.02em;
}
.nav-logo:hover { color: var(--accent); }
.nav-logo i { color: var(--accent); font-size: 1.6rem; }
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-links a {
  color: rgba(255,255,255,0.7);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  padding: 4px 0;
  transition: var(--transition);
}
.nav-links a:hover { color: var(--text-white); }
.nav-links a.active {
  color: var(--accent);
}
.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}
.nav-cta .btn {
  padding: 10px 24px;
  font-size: 0.875rem;
}
.nav-toggle {
  display: none;
  color: var(--text-white);
  font-size: 1.5rem;
  padding: 8px;
  cursor: pointer;
}
@media (max-width: 768px) {
  .nav-links, .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(13, 13, 26, 0.98);
    backdrop-filter: blur(20px);
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--border-light);
  }
  .nav-links.open + .nav-cta {
    display: none;
  }
  .nav-links.open a { font-size: 1.1rem; }
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  background: var(--bg-dark);
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
  opacity: 0.4;
  z-index: 0;
}
.hero-overlay {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: linear-gradient(135deg, rgba(13,13,26,0.92) 0%, rgba(26,26,46,0.7) 50%, rgba(13,13,26,0.85) 100%);
  z-index: 1;
}
.hero .container {
  position: relative;
  z-index: 2;
  text-align: center;
  padding-top: 40px;
  padding-bottom: 80px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent-light);
  color: var(--accent);
  padding: 8px 20px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
  border: 1px solid rgba(240, 184, 48, 0.2);
}
.hero-badge i { font-size: 0.8rem; }
.hero h1 {
  color: var(--text-white);
  font-size: 3.75rem;
  font-weight: 900;
  margin-bottom: 20px;
  line-height: 1.1;
}
.hero h1 span { color: var(--accent); }
.hero p {
  color: rgba(255,255,255,0.65);
  font-size: 1.25rem;
  max-width: 680px;
  margin: 0 auto 36px;
  line-height: 1.7;
}
.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.hero-stat-item { text-align: center; }
.hero-stat-number {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-white);
  line-height: 1;
}
.hero-stat-number span { color: var(--accent); }
.hero-stat-label {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.5);
  margin-top: 6px;
}
@media (max-width: 768px) {
  .hero h1 { font-size: 2.25rem; }
  .hero p { font-size: 1.05rem; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .hero-stat-number { font-size: 1.75rem; }
}
@media (max-width: 520px) {
  .hero h1 { font-size: 1.75rem; }
  .hero-actions { flex-direction: column; width: 100%; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .hero-stats { gap: 16px; }
  .hero-stat-item { min-width: 100px; }
}

/* ===== Section Spacing ===== */
.section {
  padding: 100px 0;
}
.section-alt { background: var(--bg-alt); }
.section-dark { background: var(--bg-dark); }
.section-dark .section-title { color: var(--text-white); }
.section-dark .section-subtitle { color: rgba(255,255,255,0.6); }
@media (max-width: 768px) {
  .section { padding: 60px 0; }
}

/* ===== Grid / Cards ===== */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; gap: 24px; }
}

.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  border: 1px solid var(--border);
  box-shadow: 0 2px 12px rgba(0,0,0,0.04);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.card-img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
.card-body { padding: 24px; }
.card-title { font-size: 1.2rem; font-weight: 700; margin-bottom: 8px; color: var(--text); }
.card-text { font-size: 0.95rem; color: var(--text-light); line-height: 1.6; }
.card-tag {
  display: inline-block;
  padding: 4px 14px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 50px;
  background: var(--accent-light);
  color: var(--accent);
  margin-bottom: 12px;
}
.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-light);
}
.card-footer i { margin-right: 4px; }

/* Dark card variant */
.card-dark {
  background: rgba(255,255,255,0.04);
  border-color: rgba(255,255,255,0.08);
}
.card-dark .card-title { color: var(--text-white); }
.card-dark .card-text { color: rgba(255,255,255,0.6); }
.card-dark .card-footer { border-color: rgba(255,255,255,0.06); color: rgba(255,255,255,0.4); }
.card-dark:hover { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.12); }

/* ===== Feature / Icon Cards ===== */
.feature-card {
  text-align: center;
  padding: 40px 28px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: var(--transition);
}
.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-light);
  border-radius: 16px;
  font-size: 1.75rem;
  color: var(--accent);
  transition: var(--transition);
}
.feature-card:hover .feature-icon {
  background: var(--accent);
  color: var(--primary);
  transform: scale(1.05);
}
.feature-card h3 { font-size: 1.2rem; margin-bottom: 12px; }
.feature-card p { font-size: 0.95rem; color: var(--text-light); margin-bottom: 0; }

/* ===== Category Card ===== */
.category-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 4/3;
  display: flex;
  align-items: flex-end;
  transition: var(--transition);
  cursor: pointer;
}
.category-card img {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  transition: var(--transition);
}
.category-card:hover img { transform: scale(1.05); }
.category-card-overlay {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: linear-gradient(0deg, rgba(13,13,26,0.85) 0%, rgba(13,13,26,0.2) 60%, transparent 100%);
  z-index: 1;
}
.category-card-content {
  position: relative;
  z-index: 2;
  padding: 28px 24px;
  width: 100%;
}
.category-card-content h3 {
  color: var(--text-white);
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 6px;
}
.category-card-content p {
  color: rgba(255,255,255,0.6);
  font-size: 0.9rem;
  margin-bottom: 0;
}
.category-card-content .btn {
  margin-top: 12px;
  padding: 8px 20px;
  font-size: 0.8rem;
}

/* ===== Info / News List ===== */
.news-list { display: flex; flex-direction: column; gap: 16px; }
.news-item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 20px 24px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: var(--transition);
}
.news-item:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow);
  transform: translateX(4px);
}
.news-item-img {
  width: 100px;
  height: 72px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  flex-shrink: 0;
}
.news-item-body { flex: 1; min-width: 0; }
.news-item-body h4 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-item-body h4 a:hover { color: var(--accent); }
.news-item-body p {
  font-size: 0.875rem;
  color: var(--text-light);
  margin-bottom: 0;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-item-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 8px;
  font-size: 0.8rem;
  color: var(--text-muted);
}
.news-item-meta i { margin-right: 4px; }
.news-empty {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-light);
  background: var(--bg-alt);
  border-radius: var(--radius);
  border: 1px dashed var(--border);
}
@media (max-width: 520px) {
  .news-item { flex-direction: column; }
  .news-item-img { width: 100%; height: 160px; }
}

/* ===== Steps / Process ===== */
.steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; counter-reset: step; }
.step-item { text-align: center; position: relative; }
.step-item::before {
  counter-increment: step;
  content: counter(step);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  background: var(--accent-light);
  color: var(--accent);
  font-size: 1.5rem;
  font-weight: 800;
  border-radius: 50%;
  transition: var(--transition);
}
.step-item:hover::before {
  background: var(--accent);
  color: var(--primary);
  transform: scale(1.1);
}
.step-item h4 { font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; }
.step-item p { font-size: 0.9rem; color: var(--text-light); margin-bottom: 0; }
@media (max-width: 768px) {
  .steps-grid { grid-template-columns: 1fr; gap: 32px; }
}

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-card);
  transition: var(--transition);
}
.faq-item:hover { border-color: var(--accent); }
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text);
  cursor: pointer;
  background: none;
  width: 100%;
  text-align: left;
  transition: var(--transition);
}
.faq-question i {
  font-size: 0.9rem;
  color: var(--text-light);
  transition: var(--transition);
}
.faq-item.open .faq-question i { transform: rotate(180deg); color: var(--accent); }
.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
}
.faq-item.open .faq-answer {
  padding: 0 24px 20px;
  max-height: 300px;
}
.faq-answer p { font-size: 0.95rem; color: var(--text-light); margin-bottom: 0; }

/* ===== CTA ===== */
.cta-section {
  background: var(--bg-dark);
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
  opacity: 0.15;
  z-index: 0;
}
.cta-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 80px 0;
}
.cta-content h2 {
  color: var(--text-white);
  font-size: 2.75rem;
  font-weight: 800;
  margin-bottom: 16px;
}
.cta-content p {
  color: rgba(255,255,255,0.6);
  font-size: 1.15rem;
  max-width: 560px;
  margin: 0 auto 32px;
}
.cta-content .btn { margin: 0 8px; }
@media (max-width: 768px) {
  .cta-content h2 { font-size: 1.75rem; }
  .cta-content p { font-size: 1rem; }
  .cta-btns { display: flex; flex-direction: column; gap: 12px; align-items: center; }
  .cta-content .btn { margin: 0; width: 100%; max-width: 320px; }
}

/* ===== Footer ===== */
.footer {
  background: var(--primary);
  border-top: 1px solid var(--border-light);
  padding: 60px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .nav-logo { margin-bottom: 16px; }
.footer-brand p {
  color: rgba(255,255,255,0.5);
  font-size: 0.9rem;
  max-width: 320px;
  line-height: 1.7;
}
.footer-col h4 {
  color: var(--text-white);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
}
.footer-col a {
  display: block;
  color: rgba(255,255,255,0.5);
  font-size: 0.9rem;
  padding: 4px 0;
  transition: var(--transition);
}
.footer-col a:hover { color: var(--accent); padding-left: 4px; }
.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: 16px;
}
.footer-bottom p {
  color: rgba(255,255,255,0.35);
  font-size: 0.85rem;
  margin-bottom: 0;
}
.footer-socials { display: flex; gap: 12px; }
.footer-socials a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
  color: rgba(255,255,255,0.5);
  transition: var(--transition);
}
.footer-socials a:hover {
  background: var(--accent);
  color: var(--primary);
  transform: translateY(-2px);
}
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 520px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

/* ===== Utilities ===== */
.text-center { text-align: center; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mt-40 { margin-top: 40px; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-40 { margin-bottom: 40px; }
.gap-8 { gap: 8px; }
.gap-16 { gap: 16px; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-wrap { flex-wrap: wrap; }

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-alt); }
::-webkit-scrollbar-thumb { background: var(--text-muted); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-light); }

/* ===== Animation ===== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-fade-up { animation: fadeUp 0.6s ease forwards; }
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #e50914;
            --primary-dark: #b20710;
            --primary-light: #ff3b4a;
            --secondary: #0d0d0d;
            --secondary-light: #1a1a2e;
            --accent: #f5c518;
            --bg-dark: #0a0a0a;
            --bg-card: #141414;
            --bg-section: #111111;
            --bg-surface: #1c1c1e;
            --text-primary: #ffffff;
            --text-secondary: #b3b3b3;
            --text-weak: #6b6b6b;
            --border-color: #2a2a2a;
            --border-light: #333333;
            --radius-sm: 6px;
            --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);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Segoe UI', system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --container-max: 1200px;
            --header-h: 72px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-sans);
            background: var(--bg-dark);
            color: var(--text-primary);
            line-height: 1.6;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
        }
        p {
            margin-bottom: 0.8em;
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header & Navigation ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(10, 10, 10, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-color);
            height: var(--header-h);
            transition: var(--transition);
        }
        .header.scrolled {
            background: rgba(10, 10, 10, 0.98);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
        }
        .nav {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--header-h);
            gap: 16px;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: 0.5px;
            flex-shrink: 0;
        }
        .nav-logo i {
            color: var(--primary);
            font-size: 1.5rem;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 8px;
            flex: 1;
            justify-content: center;
        }
        .nav-links a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: var(--transition);
            position: relative;
        }
        .nav-links a:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.06);
        }
        .nav-links a.active {
            color: var(--text-primary);
            background: rgba(229, 9, 20, 0.15);
        }
        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--primary);
            border-radius: 2px;
        }
        .nav-cta {
            flex-shrink: 0;
        }
        .nav-toggle {
            display: none;
            font-size: 1.5rem;
            color: var(--text-primary);
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.06);
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 28px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: var(--transition);
            border: 2px solid transparent;
            line-height: 1.4;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(229, 9, 20, 0.35);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(229, 9, 20, 0.25);
        }
        .btn-primary:focus-visible {
            outline: 3px solid var(--primary-light);
            outline-offset: 3px;
        }
        .btn-secondary {
            background: transparent;
            color: var(--text-primary);
            border-color: var(--border-light);
        }
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.06);
            border-color: var(--text-secondary);
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 6px 18px;
            font-size: 0.85rem;
        }
        .btn-lg {
            padding: 14px 36px;
            font-size: 1.1rem;
            border-radius: var(--radius-md);
        }
        .btn-outline {
            background: transparent;
            border-color: var(--primary);
            color: var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }

        /* ===== Page Banner (inner) ===== */
        .page-banner {
            padding-top: calc(var(--header-h) + 40px);
            padding-bottom: 60px;
            background: linear-gradient(135deg, #0a0a0a 0%, #1a0a0e 50%, #0d0d0d 100%);
            position: relative;
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.15;
            z-index: 0;
        }
        .page-banner::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(90deg, rgba(10, 10, 10, 0.85) 0%, rgba(10, 10, 10, 0.4) 100%);
            z-index: 1;
        }
        .page-banner .container {
            position: relative;
            z-index: 2;
        }
        .page-banner h1 {
            font-size: 2.8rem;
            font-weight: 800;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #fff 60%, var(--primary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .page-banner p {
            font-size: 1.15rem;
            color: var(--text-secondary);
            max-width: 680px;
            line-height: 1.7;
        }
        .page-banner .banner-meta {
            display: flex;
            gap: 24px;
            margin-top: 20px;
            flex-wrap: wrap;
        }
        .page-banner .banner-meta span {
            display: flex;
            align-items: center;
            gap: 8px;
            color: var(--text-weak);
            font-size: 0.9rem;
        }
        .page-banner .banner-meta i {
            color: var(--primary);
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 16px 0 8px;
            font-size: 0.85rem;
            color: var(--text-weak);
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--text-secondary);
            transition: var(--transition);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb .sep {
            color: var(--text-weak);
            font-size: 0.7rem;
        }
        .breadcrumb .current {
            color: var(--text-primary);
            font-weight: 500;
        }

        /* ===== Sections ===== */
        .section {
            padding: 80px 0;
        }
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 12px;
            letter-spacing: -0.3px;
        }
        .section-subtitle {
            color: var(--text-secondary);
            font-size: 1.05rem;
            max-width: 600px;
            margin-bottom: 40px;
            line-height: 1.7;
        }
        .section-divider {
            width: 60px;
            height: 4px;
            background: var(--primary);
            border-radius: 2px;
            margin-bottom: 24px;
        }

        /* ===== Cards ===== */
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .card:hover {
            transform: translateY(-6px);
            border-color: var(--border-light);
            box-shadow: var(--shadow-md);
        }
        .card-img {
            width: 100%;
            aspect-ratio: 16 / 9;
            object-fit: cover;
            display: block;
            background: var(--bg-surface);
        }
        .card-body {
            padding: 24px;
        }
        .card-body h3 {
            font-size: 1.2rem;
            margin-bottom: 8px;
            font-weight: 600;
        }
        .card-body p {
            color: var(--text-secondary);
            font-size: 0.92rem;
            line-height: 1.6;
        }
        .card-tags {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            margin-bottom: 12px;
        }

        /* ===== Badges & Tags ===== */
        .badge {
            display: inline-block;
            padding: 3px 12px;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
            background: rgba(229, 9, 20, 0.15);
            color: var(--primary-light);
            border: 1px solid rgba(229, 9, 20, 0.2);
        }
        .badge-hot {
            background: rgba(245, 197, 24, 0.15);
            color: var(--accent);
            border-color: rgba(245, 197, 24, 0.2);
        }
        .badge-new {
            background: rgba(0, 200, 150, 0.15);
            color: #00c896;
            border-color: rgba(0, 200, 150, 0.2);
        }
        .tag {
            display: inline-block;
            padding: 2px 10px;
            border-radius: var(--radius-sm);
            font-size: 0.75rem;
            background: var(--bg-surface);
            color: var(--text-secondary);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .tag:hover {
            border-color: var(--text-weak);
            color: var(--text-primary);
        }

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

        /* ===== Guide Steps ===== */
        .steps {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 32px;
            counter-reset: step;
        }
        .step-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            border: 1px solid var(--border-color);
            transition: var(--transition);
            position: relative;
            text-align: center;
        }
        .step-item:hover {
            transform: translateY(-4px);
            border-color: var(--border-light);
            box-shadow: var(--shadow-sm);
        }
        .step-item::before {
            counter-increment: step;
            content: counter(step);
            position: absolute;
            top: -14px;
            left: 50%;
            transform: translateX(-50%);
            width: 32px;
            height: 32px;
            background: var(--primary);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.9rem;
            box-shadow: 0 4px 12px rgba(229, 9, 20, 0.3);
        }
        .step-item .step-icon {
            font-size: 2.2rem;
            color: var(--primary);
            margin-bottom: 16px;
            margin-top: 4px;
        }
        .step-item h3 {
            font-size: 1.15rem;
            margin-bottom: 8px;
        }
        .step-item p {
            color: var(--text-secondary);
            font-size: 0.9rem;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 820px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--border-light);
        }
        .faq-question {
            padding: 20px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            gap: 16px;
            user-select: none;
            transition: var(--transition);
        }
        .faq-question:hover {
            background: rgba(255, 255, 255, 0.02);
        }
        .faq-question i {
            color: var(--primary);
            font-size: 1.1rem;
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, #1a0a0e 0%, #0d0d0d 50%, #1a0a0e 100%);
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
            text-align: center;
            padding: 80px 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;
            z-index: 0;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
        }
        .cta-section h2 {
            font-size: 2.4rem;
            font-weight: 800;
            margin-bottom: 16px;
        }
        .cta-section p {
            color: var(--text-secondary);
            font-size: 1.1rem;
            max-width: 560px;
            margin: 0 auto 32px;
        }
        .cta-buttons {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--secondary);
            border-top: 1px solid var(--border-color);
            padding: 60px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1.2fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand p {
            color: var(--text-weak);
            font-size: 0.9rem;
            margin-top: 12px;
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 18px;
            color: var(--text-primary);
        }
        .footer-col a {
            display: block;
            padding: 6px 0;
            color: var(--text-weak);
            font-size: 0.9rem;
            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;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
        }
        .footer-bottom p {
            color: var(--text-weak);
            font-size: 0.85rem;
            margin: 0;
        }
        .footer-socials {
            display: flex;
            gap: 14px;
        }
        .footer-socials a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: var(--bg-surface);
            color: var(--text-secondary);
            font-size: 1.1rem;
            transition: var(--transition);
            border: 1px solid var(--border-color);
        }
        .footer-socials a:hover {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(229, 9, 20, 0.3);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .grid-3 {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: rgba(10, 10, 10, 0.98);
                backdrop-filter: blur(12px);
                flex-direction: column;
                padding: 16px 24px;
                border-bottom: 1px solid var(--border-color);
                gap: 4px;
                box-shadow: var(--shadow-md);
            }
            .nav-links.open {
                display: flex;
            }
            .nav-links a {
                width: 100%;
                padding: 12px 16px;
                border-radius: var(--radius-sm);
            }
            .nav-links a.active::after {
                display: none;
            }
            .nav-links a.active {
                background: rgba(229, 9, 20, 0.12);
            }
            .nav-toggle {
                display: block;
            }
            .nav-cta .btn {
                padding: 6px 14px;
                font-size: 0.8rem;
            }
            .page-banner {
                min-height: 240px;
                padding-top: calc(var(--header-h) + 24px);
                padding-bottom: 40px;
            }
            .page-banner h1 {
                font-size: 1.8rem;
            }
            .page-banner p {
                font-size: 0.95rem;
            }
            .page-banner .banner-meta {
                gap: 12px;
            }
            .section {
                padding: 48px 0;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .section-subtitle {
                font-size: 0.95rem;
                margin-bottom: 28px;
            }
            .grid-2,
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .steps {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .cta-section h2 {
                font-size: 1.6rem;
            }
            .cta-section p {
                font-size: 0.95rem;
            }
            .cta-buttons .btn {
                width: 100%;
                max-width: 300px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .footer-socials {
                justify-content: center;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .page-banner h1 {
                font-size: 1.4rem;
            }
            .nav-logo {
                font-size: 1.05rem;
            }
            .nav-logo i {
                font-size: 1.2rem;
            }
            .section-title {
                font-size: 1.3rem;
            }
            .card-body {
                padding: 16px;
            }
            .card-body h3 {
                font-size: 1.05rem;
            }
            .faq-question {
                padding: 16px 18px;
                font-size: 0.9rem;
            }
            .faq-answer {
                font-size: 0.88rem;
            }
            .step-item {
                padding: 24px 16px;
            }
        }

        /* ===== Utility ===== */
        .text-center {
            text-align: center;
        }
        .mt-8 {
            margin-top: 8px;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }
        .mb-8 {
            margin-bottom: 8px;
        }
        .mb-16 {
            margin-bottom: 16px;
        }
        .mb-24 {
            margin-bottom: 24px;
        }
        .gap-12 {
            gap: 12px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .flex-wrap {
            flex-wrap: wrap;
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-dark);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--border-light);
            border-radius: 4px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-weak);
        }

        /* ===== Focus visible ===== */
        :focus-visible {
            outline: 3px solid var(--primary-light);
            outline-offset: 2px;
        }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #6C5CE7;
            --primary-dark: #5A4BD1;
            --primary-light: #A29BFE;
            --secondary: #FF9F43;
            --secondary-dark: #E8892F;
            --accent: #FD79A8;
            --bg-body: #F4F5F7;
            --bg-white: #FFFFFF;
            --bg-light: #F8F9FA;
            --bg-dark: #2D3436;
            --bg-dark-card: #3D4449;
            --text-primary: #1E1E2F;
            --text-secondary: #4A4A6A;
            --text-muted: #7F8C8D;
            --text-white: #FFFFFF;
            --text-light: #DFE6E9;
            --border-color: #E8E8F0;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 22px;
            --radius-xl: 30px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
            --shadow-md: 0 8px 30px rgba(0,0,0,0.10);
            --shadow-lg: 0 20px 60px rgba(0,0,0,0.15);
            --shadow-hover: 0 16px 48px rgba(108,92,231,0.20);
            --transition: 0.30s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            --container-width: 1200px;
            --header-height: 72px;
            --spacer-section: 80px;
            --spacer-block: 48px;
        }

        /* ===== 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-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--primary-dark); }
        a:focus-visible { outline: 3px solid var(--primary-light); outline-offset: 2px; border-radius: 4px; }
        button { cursor: pointer; font-family: inherit; border: none; background: none; transition: var(--transition); }
        button:focus-visible { outline: 3px solid var(--primary-light); outline-offset: 2px; border-radius: 6px; }
        input, textarea { font-family: inherit; font-size: 1rem; border: 1px solid var(--border-color); border-radius: var(--radius-sm); padding: 0.6rem 1rem; transition: var(--transition); background: var(--bg-white); color: var(--text-primary); }
        input:focus, textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(108,92,231,0.15); outline: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text-primary); }
        p { margin-bottom: 1rem; color: var(--text-secondary); }
        .container { width: 100%; max-width: var(--container-width); margin: 0 auto; padding: 0 24px; }
        .container-narrow { max-width: 820px; margin: 0 auto; padding: 0 24px; }

        /* ===== Header & Nav ===== */
        .header {
            position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            height: var(--header-height);
            transition: var(--transition);
        }
        .header.scrolled { box-shadow: var(--shadow-sm); }
        .nav {
            display: flex; align-items: center; justify-content: space-between;
            height: var(--header-height); gap: 16px;
        }
        .nav-logo {
            display: flex; align-items: center; gap: 10px;
            font-size: 1.5rem; font-weight: 800;
            color: var(--primary); text-decoration: none;
            letter-spacing: -0.5px; white-space: nowrap;
        }
        .nav-logo i { font-size: 1.6rem; color: var(--secondary); }
        .nav-logo:hover { color: var(--primary-dark); }
        .nav-links { display: flex; align-items: center; gap: 8px; }
        .nav-links a {
            display: inline-flex; align-items: center; gap: 6px;
            padding: 0.5rem 1.2rem; border-radius: 30px;
            font-size: 0.95rem; font-weight: 500;
            color: var(--text-secondary); text-decoration: none;
            transition: var(--transition); position: relative;
        }
        .nav-links a:hover { background: rgba(108,92,231,0.08); color: var(--primary); }
        .nav-links a.active { background: var(--primary); color: var(--text-white); box-shadow: 0 4px 14px rgba(108,92,231,0.30); }
        .nav-cta { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
        .nav-toggle { display: none; font-size: 1.6rem; color: var(--text-primary); padding: 6px; background: none; border: none; }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex; align-items: center; justify-content: center; gap: 8px;
            padding: 0.7rem 1.8rem; border-radius: 30px; font-weight: 600;
            font-size: 0.95rem; text-decoration: none; cursor: pointer;
            transition: var(--transition); border: 2px solid transparent;
            white-space: nowrap; line-height: 1.4;
        }
        .btn-primary { background: var(--primary); color: var(--text-white); border-color: var(--primary); }
        .btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: var(--text-white); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(108,92,231,0.35); }
        .btn-secondary { background: var(--secondary); color: var(--text-white); border-color: var(--secondary); }
        .btn-secondary:hover { background: var(--secondary-dark); border-color: var(--secondary-dark); color: var(--text-white); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(255,159,67,0.35); }
        .btn-outline { background: transparent; color: var(--primary); border-color: var(--primary); }
        .btn-outline:hover { background: var(--primary); color: var(--text-white); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(108,92,231,0.25); }
        .btn-white { background: var(--text-white); color: var(--primary); border-color: var(--text-white); }
        .btn-white:hover { background: rgba(255,255,255,0.9); color: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.12); }
        .btn-sm { padding: 0.45rem 1.2rem; font-size: 0.85rem; }
        .btn-lg { padding: 0.9rem 2.4rem; font-size: 1.05rem; }
        .btn i { font-size: 0.9em; }

        /* ===== Badge / Tag ===== */
        .badge {
            display: inline-flex; align-items: center; gap: 4px;
            padding: 0.2rem 0.8rem; border-radius: 20px;
            font-size: 0.78rem; font-weight: 600; letter-spacing: 0.3px;
            background: rgba(108,92,231,0.12); color: var(--primary);
        }
        .badge-hot { background: rgba(255,159,67,0.18); color: var(--secondary-dark); }
        .badge-new { background: rgba(253,121,168,0.15); color: var(--accent); }
        .tag {
            display: inline-block; padding: 0.2rem 0.9rem; border-radius: 16px;
            font-size: 0.75rem; font-weight: 500;
            background: var(--bg-light); color: var(--text-muted);
            border: 1px solid var(--border-color); transition: var(--transition);
        }
        .tag:hover { border-color: var(--primary); color: var(--primary); background: rgba(108,92,231,0.05); }

        /* ===== Article Hero ===== */
        .article-hero {
            position: relative; margin-top: var(--header-height);
            padding: 80px 0 60px; overflow: hidden;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            min-height: 340px; display: flex; align-items: center;
        }
        .article-hero::before {
            content: ''; position: absolute; inset: 0;
            background: linear-gradient(135deg, rgba(45,52,54,0.85) 0%, rgba(108,92,231,0.55) 100%);
            z-index: 1;
        }
        .article-hero .container-narrow { position: relative; z-index: 2; width: 100%; }
        .article-hero-meta {
            display: flex; flex-wrap: wrap; align-items: center; gap: 12px 20px;
            margin-bottom: 18px; color: var(--text-light);
        }
        .article-hero-meta .badge { background: rgba(255,255,255,0.20); color: var(--text-white); font-size: 0.8rem; }
        .article-hero-meta span { font-size: 0.88rem; opacity: 0.85; display: flex; align-items: center; gap: 6px; }
        .article-hero h1 {
            font-size: clamp(1.6rem, 4vw, 2.8rem); font-weight: 800;
            color: var(--text-white); line-height: 1.25; margin-bottom: 14px;
            text-shadow: 0 2px 30px rgba(0,0,0,0.25);
        }
        .article-hero .article-desc {
            font-size: 1.1rem; color: rgba(255,255,255,0.85);
            max-width: 680px; line-height: 1.7; margin-bottom: 6px;
        }

        /* ===== Article Body ===== */
        .article-section { padding: 60px 0 40px; }
        .article-content-wrap {
            background: var(--bg-white); border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm); padding: 48px 56px;
        }
        .article-content { font-size: 1.05rem; line-height: 1.9; color: var(--text-secondary); }
        .article-content h2 { font-size: 1.6rem; margin: 2rem 0 1rem; color: var(--text-primary); }
        .article-content h3 { font-size: 1.3rem; margin: 1.6rem 0 0.8rem; color: var(--text-primary); }
        .article-content p { margin-bottom: 1.2rem; }
        .article-content img { margin: 1.5rem 0; border-radius: var(--radius-md); box-shadow: var(--shadow-sm); }
        .article-content ul, .article-content ol { margin: 1rem 0 1.2rem 1.6rem; }
        .article-content li { margin-bottom: 0.5rem; color: var(--text-secondary); }
        .article-content blockquote {
            border-left: 4px solid var(--primary); background: rgba(108,92,231,0.06);
            padding: 1.2rem 1.6rem; margin: 1.5rem 0; border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary); font-style: italic;
        }
        .article-content a { color: var(--primary); text-decoration: underline; text-underline-offset: 3px; }
        .article-content a:hover { color: var(--primary-dark); }

        .article-not-found { text-align: center; padding: 80px 24px; }
        .article-not-found i { font-size: 3.6rem; color: var(--text-muted); margin-bottom: 20px; display: block; }
        .article-not-found h2 { font-size: 1.8rem; margin-bottom: 12px; }
        .article-not-found p { font-size: 1.1rem; color: var(--text-muted); margin-bottom: 24px; }

        /* ===== Article Footer Bar ===== */
        .article-bar {
            display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
            gap: 16px; margin-top: 40px; padding-top: 24px;
            border-top: 1px solid var(--border-color);
        }
        .article-bar .tags { display: flex; flex-wrap: wrap; gap: 8px; }
        .article-bar .share { display: flex; align-items: center; gap: 10px; }
        .article-bar .share span { font-size: 0.9rem; color: var(--text-muted); }
        .article-bar .share a {
            display: inline-flex; align-items: center; justify-content: center;
            width: 36px; height: 36px; border-radius: 50%;
            background: var(--bg-light); color: var(--text-secondary);
            font-size: 1rem; transition: var(--transition);
        }
        .article-bar .share a:hover { background: var(--primary); color: var(--text-white); transform: translateY(-2px); }

        /* ===== Related Articles ===== */
        .related-section { padding: 60px 0 80px; background: var(--bg-white); }
        .section-header {
            text-align: center; margin-bottom: 48px;
            position: relative;
        }
        .section-header h2 {
            font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 800;
            color: var(--text-primary); margin-bottom: 10px;
        }
        .section-header p { color: var(--text-muted); max-width: 540px; margin: 0 auto; font-size: 1rem; }
        .section-header::after {
            content: ''; display: block; width: 60px; height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            border-radius: 4px; margin: 16px auto 0;
        }
        .related-grid {
            display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
        }
        .related-card {
            background: var(--bg-white); border-radius: var(--radius-md);
            overflow: hidden; box-shadow: var(--shadow-sm);
            transition: var(--transition); border: 1px solid var(--border-color);
            display: flex; flex-direction: column;
        }
        .related-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); border-color: transparent; }
        .related-card .card-img {
            aspect-ratio: 16 / 10; overflow: hidden; position: relative;
            background: var(--bg-light);
        }
        .related-card .card-img img {
            width: 100%; height: 100%; object-fit: cover;
            transition: var(--transition);
        }
        .related-card:hover .card-img img { transform: scale(1.06); }
        .related-card .card-body { padding: 18px 20px 20px; flex: 1; display: flex; flex-direction: column; }
        .related-card .card-body .badge { align-self: flex-start; margin-bottom: 8px; }
        .related-card .card-body h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; line-height: 1.4; }
        .related-card .card-body h3 a { color: var(--text-primary); text-decoration: none; }
        .related-card .card-body h3 a:hover { color: var(--primary); }
        .related-card .card-body p { font-size: 0.88rem; color: var(--text-muted); margin-bottom: 12px; flex: 1; }
        .related-card .card-meta { display: flex; align-items: center; gap: 14px; font-size: 0.8rem; color: var(--text-muted); border-top: 1px solid var(--border-color); padding-top: 12px; }

        /* ===== CTA Section ===== */
        .cta-section {
            padding: 80px 0; text-align: center;
            background: linear-gradient(135deg, var(--primary) 0%, #8B7CF7 100%);
            position: relative; overflow: hidden;
        }
        .cta-section::before {
            content: ''; position: absolute; top: -50%; left: -50%;
            width: 200%; height: 200%;
            background: radial-gradient(circle at 30% 50%, rgba(255,255,255,0.08) 0%, transparent 60%);
            pointer-events: none;
        }
        .cta-section .container { position: relative; z-index: 2; }
        .cta-section h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); color: var(--text-white); margin-bottom: 14px; }
        .cta-section p { font-size: 1.1rem; color: rgba(255,255,255,0.85); max-width: 580px; margin: 0 auto 28px; }
        .cta-section .btn-white { box-shadow: 0 8px 30px rgba(0,0,0,0.15); }
        .cta-section .btn-white:hover { transform: translateY(-3px); box-shadow: 0 12px 40px rgba(0,0,0,0.20); }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-dark); color: var(--text-light);
            padding: 60px 0 0; position: relative;
        }
        .footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,0.08); }
        .footer-brand .nav-logo { color: var(--text-white); margin-bottom: 14px; display: inline-flex; }
        .footer-brand .nav-logo i { color: var(--secondary); }
        .footer-brand p { font-size: 0.9rem; color: rgba(255,255,255,0.6); line-height: 1.7; max-width: 320px; }
        .footer-col h4 { font-size: 1rem; font-weight: 700; color: var(--text-white); margin-bottom: 16px; position: relative; padding-bottom: 8px; }
        .footer-col h4::after { content: ''; position: absolute; bottom: 0; left: 0; width: 30px; height: 3px; background: var(--primary); border-radius: 3px; }
        .footer-col a { display: block; color: rgba(255,255,255,0.55); font-size: 0.9rem; padding: 5px 0; text-decoration: none; transition: var(--transition); }
        .footer-col a:hover { color: var(--text-white); padding-left: 4px; }
        .footer-bottom { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; padding: 24px 0; }
        .footer-bottom p { font-size: 0.85rem; color: rgba(255,255,255,0.4); margin: 0; }
        .footer-socials { display: flex; gap: 12px; }
        .footer-socials a { display: inline-flex; align-items: center; justify-content: center; width: 38px; height: 38px; border-radius: 50%; background: rgba(255,255,255,0.08); color: rgba(255,255,255,0.5); font-size: 1.1rem; transition: var(--transition); }
        .footer-socials a:hover { background: var(--primary); color: var(--text-white); transform: translateY(-3px); }

        /* ===== Breadcrumb ===== */
        .breadcrumb { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-bottom: 20px; font-size: 0.88rem; color: var(--text-muted); }
        .breadcrumb a { color: rgba(255,255,255,0.7); text-decoration: none; }
        .breadcrumb a:hover { color: var(--text-white); }
        .breadcrumb span { color: rgba(255,255,255,0.9); }
        .breadcrumb i { font-size: 0.7rem; color: rgba(255,255,255,0.4); }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            :root { --spacer-section: 60px; }
            .related-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .article-content-wrap { padding: 36px 32px; }
        }
        @media (max-width: 768px) {
            :root { --header-height: 64px; --spacer-section: 48px; }
            .nav-links { display: none; position: absolute; top: var(--header-height); left: 0; width: 100%; background: rgba(255,255,255,0.98); backdrop-filter: blur(18px); flex-direction: column; padding: 16px 24px 24px; box-shadow: var(--shadow-md); border-bottom: 1px solid var(--border-color); gap: 4px; }
            .nav-links.open { display: flex; }
            .nav-links a { width: 100%; justify-content: center; padding: 0.7rem 1rem; border-radius: var(--radius-sm); }
            .nav-toggle { display: block; }
            .nav-cta { gap: 8px; }
            .nav-cta .btn-sm { padding: 0.4rem 1rem; font-size: 0.82rem; }
            .article-hero { padding: 60px 0 40px; min-height: 260px; }
            .article-hero h1 { font-size: 1.5rem; }
            .article-hero .article-desc { font-size: 0.95rem; }
            .article-content-wrap { padding: 28px 20px; border-radius: var(--radius-sm); }
            .article-content { font-size: 0.98rem; }
            .related-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .section-header { margin-bottom: 32px; }
            .cta-section { padding: 60px 0; }
            .cta-section p { font-size: 1rem; }
        }
        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .nav-logo { font-size: 1.2rem; gap: 6px; }
            .nav-logo i { font-size: 1.2rem; }
            .nav-cta .btn-sm { padding: 0.3rem 0.8rem; font-size: 0.75rem; }
            .article-hero { padding: 48px 0 32px; min-height: 200px; }
            .article-hero h1 { font-size: 1.3rem; }
            .article-hero-meta { gap: 8px 14px; font-size: 0.82rem; }
            .article-content-wrap { padding: 20px 16px; }
            .article-content { font-size: 0.92rem; }
            .article-bar { flex-direction: column; align-items: flex-start; gap: 12px; }
            .related-grid { grid-template-columns: 1fr; gap: 16px; }
            .related-card .card-body { padding: 14px 16px 16px; }
            .section-header h2 { font-size: 1.3rem; }
            .cta-section h2 { font-size: 1.4rem; }
            .cta-section .btn-lg { padding: 0.7rem 1.6rem; font-size: 0.9rem; }
            .footer { padding: 40px 0 0; }
            .footer-grid { gap: 24px; }
        }

        /* ===== Utility ===== */
        .text-center { text-align: center; }
        .mt-1 { margin-top: 0.5rem; }
        .mt-2 { margin-top: 1rem; }
        .mb-2 { margin-bottom: 1rem; }
        .gap-2 { gap: 0.5rem; }
        .flex-center { display: flex; align-items: center; justify-content: center; }
        .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }