/* roulang page: index */
/* ===== Design Variables ===== */
:root {
  --clr-primary: #6C5CE7;
  --clr-primary-dark: #5a4bd1;
  --clr-primary-light: #8b7cf0;
  --clr-accent: #FDCB6E;
  --clr-accent-dark: #f0b94a;
  --clr-bg: #0a0a1a;
  --clr-bg-card: #14142e;
  --clr-bg-card-hover: #1c1c3e;
  --clr-bg-section: #0f0f24;
  --clr-text: #ffffff;
  --clr-text-secondary: #b0b0c8;
  --clr-text-muted: #6e6e8a;
  --clr-border: rgba(108, 92, 231, 0.2);
  --clr-border-hover: rgba(108, 92, 231, 0.5);
  --clr-overlay: rgba(10, 10, 26, 0.7);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --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(0,0,0,0.6);
  --shadow-glow: 0 0 30px rgba(108, 92, 231, 0.15);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 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);
  background: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.6;
  font-size: 16px;
  overflow-x: hidden;
}
a { color: var(--clr-primary-light); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--clr-accent); }
img { max-width: 100%; height: auto; display: block; }
button, input, select, textarea { font-family: inherit; font-size: inherit; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.3; color: var(--clr-text); }
h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.125rem, 2.5vw, 1.5rem); }
p { color: var(--clr-text-secondary); margin-bottom: 1rem; }

/* ===== Container ===== */
.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.container--narrow { max-width: 800px; }
.container--wide { max-width: 1400px; }

/* ===== Header / Navigation ===== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--nav-height);
  background: rgba(10, 10, 26, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--clr-border);
  transition: background var(--transition), border-color var(--transition);
}
.site-header.scrolled { background: rgba(10, 10, 26, 0.95); border-color: var(--clr-border-hover); }
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px;
}
.logo { display: flex; align-items: center; gap: 10px; font-size: 1.35rem; font-weight: 800; letter-spacing: -0.5px; color: var(--clr-text); }
.logo i { color: var(--clr-primary); font-size: 1.6rem; }
.logo span { background: linear-gradient(135deg, var(--clr-text) 60%, var(--clr-primary-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.logo:hover span { background: linear-gradient(135deg, var(--clr-accent), var(--clr-primary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.nav-main { display: flex; align-items: center; gap: 8px; }
.nav-main a {
  position: relative; padding: 8px 18px; font-size: 0.9rem; font-weight: 500;
  color: var(--clr-text-secondary); border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  letter-spacing: 0.3px;
}
.nav-main a:hover { color: var(--clr-text); background: rgba(108, 92, 231, 0.1); }
.nav-main a.active { color: var(--clr-text); }
.nav-main a.active::after {
  content: ''; position: absolute; bottom: 2px; left: 50%; transform: translateX(-50%);
  width: 20px; height: 3px; background: var(--clr-primary); border-radius: 2px;
}
.nav-main a i { margin-right: 6px; font-size: 0.85rem; }
.nav-toggle { display: none; background: none; border: none; color: var(--clr-text); font-size: 1.5rem; cursor: pointer; padding: 4px; }

/* ===== Hero Section ===== */
.hero {
  position: relative; min-height: 90vh; display: flex; align-items: center;
  padding: calc(var(--nav-height) + 40px) 0 80px;
  background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
  overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(10,10,26,0.85) 0%, rgba(10,10,26,0.5) 50%, rgba(108,92,231,0.2) 100%);
  z-index: 1;
}
.hero::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 120px;
  background: linear-gradient(to top, var(--clr-bg), transparent); z-index: 2;
}
.hero .container { position: relative; z-index: 3; }
.hero-content { max-width: 680px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px; background: rgba(108, 92, 231, 0.2); border: 1px solid rgba(108, 92, 231, 0.3);
  border-radius: 50px; font-size: 0.8rem; color: var(--clr-accent); margin-bottom: 24px;
  backdrop-filter: blur(10px);
}
.hero-badge i { font-size: 0.75rem; }
.hero h1 { margin-bottom: 20px; }
.hero h1 span { background: linear-gradient(135deg, var(--clr-accent), var(--clr-primary-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero p { font-size: 1.15rem; margin-bottom: 32px; max-width: 520px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 10px; padding: 14px 32px;
  border-radius: 50px; font-weight: 600; font-size: 0.95rem; border: none; cursor: pointer;
  transition: all var(--transition); letter-spacing: 0.3px;
}
.btn--primary { background: var(--clr-primary); color: #fff; box-shadow: 0 4px 20px rgba(108, 92, 231, 0.4); }
.btn--primary:hover { background: var(--clr-primary-dark); transform: translateY(-2px); box-shadow: 0 8px 30px rgba(108, 92, 231, 0.5); color: #fff; }
.btn--outline { background: transparent; color: var(--clr-text); border: 1.5px solid var(--clr-border); }
.btn--outline:hover { border-color: var(--clr-primary); color: var(--clr-primary-light); transform: translateY(-2px); }
.btn--accent { background: var(--clr-accent); color: #1a1a2e; box-shadow: 0 4px 20px rgba(253, 203, 110, 0.3); }
.btn--accent:hover { background: var(--clr-accent-dark); transform: translateY(-2px); box-shadow: 0 8px 30px rgba(253, 203, 110, 0.4); color: #1a1a2e; }
.btn i { font-size: 1rem; }
.hero-stats { display: flex; gap: 40px; margin-top: 48px; padding-top: 32px; border-top: 1px solid var(--clr-border); }
.hero-stat h3 { font-size: 1.8rem; color: var(--clr-accent); }
.hero-stat p { font-size: 0.85rem; color: var(--clr-text-muted); margin: 0; }

/* ===== Section Spacing ===== */
.section { padding: 80px 0; }
.section--dark { background: var(--clr-bg-section); }
.section-header { text-align: center; max-width: 640px; margin: 0 auto 56px; }
.section-header h2 { margin-bottom: 16px; }
.section-header p { font-size: 1.05rem; }
.section-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 14px; background: rgba(108, 92, 231, 0.12); border: 1px solid rgba(108, 92, 231, 0.2);
  border-radius: 50px; font-size: 0.75rem; color: var(--clr-primary-light); margin-bottom: 16px;
  text-transform: uppercase; letter-spacing: 1px;
}

/* ===== Card Grid ===== */
.card-grid { display: grid; gap: 24px; }
.card-grid--2 { grid-template-columns: repeat(2, 1fr); }
.card-grid--3 { grid-template-columns: repeat(3, 1fr); }
.card-grid--4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: var(--clr-bg-card); border-radius: var(--radius-md);
  border: 1px solid var(--clr-border); overflow: hidden;
  transition: all var(--transition);
}
.card:hover { background: var(--clr-bg-card-hover); border-color: var(--clr-border-hover); transform: translateY(-4px); box-shadow: var(--shadow-glow); }
.card__image { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
.card__body { padding: 20px 24px 24px; }
.card__tag {
  display: inline-block; padding: 2px 12px; background: rgba(108, 92, 231, 0.15);
  border-radius: 50px; font-size: 0.75rem; color: var(--clr-primary-light); margin-bottom: 10px;
}
.card__title { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card__title a { color: var(--clr-text); }
.card__title a:hover { color: var(--clr-accent); }
.card__meta { display: flex; align-items: center; gap: 16px; font-size: 0.8rem; color: var(--clr-text-muted); margin-top: 12px; }
.card__meta i { margin-right: 4px; }
.card__desc { font-size: 0.9rem; color: var(--clr-text-secondary); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin-bottom: 0; }

/* ===== Feature / Intro Section ===== */
.intro-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.intro-image { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-md); }
.intro-image img { width: 100%; height: auto; }
.intro-content h2 { margin-bottom: 20px; }
.intro-content p { font-size: 1.05rem; }
.intro-list { margin-top: 24px; display: grid; gap: 16px; }
.intro-list li { display: flex; align-items: flex-start; gap: 14px; }
.intro-list li i { color: var(--clr-accent); font-size: 1.1rem; margin-top: 3px; flex-shrink: 0; }
.intro-list li h4 { font-size: 1rem; margin-bottom: 4px; }
.intro-list li p { font-size: 0.9rem; margin: 0; }

/* ===== Steps / Process ===== */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; counter-reset: step; }
.step { text-align: center; padding: 32px 20px; background: var(--clr-bg-card); border-radius: var(--radius-md); border: 1px solid var(--clr-border); position: relative; transition: all var(--transition); }
.step:hover { border-color: var(--clr-border-hover); transform: translateY(-4px); box-shadow: var(--shadow-glow); }
.step::before { counter-increment: step; content: counter(step); position: absolute; top: -12px; left: 50%; transform: translateX(-50%); width: 32px; height: 32px; background: var(--clr-primary); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 0.85rem; font-weight: 700; color: #fff; box-shadow: 0 4px 12px rgba(108, 92, 231, 0.3); }
.step__icon { font-size: 2rem; color: var(--clr-accent); margin-bottom: 16px; margin-top: 8px; }
.step h4 { font-size: 1.05rem; margin-bottom: 8px; }
.step p { font-size: 0.85rem; margin: 0; }

/* ===== Stats / Data ===== */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat-card { text-align: center; padding: 32px 20px; background: var(--clr-bg-card); border-radius: var(--radius-md); border: 1px solid var(--clr-border); }
.stat-card__number { font-size: 2.5rem; font-weight: 800; color: var(--clr-accent); margin-bottom: 8px; }
.stat-card__label { font-size: 0.9rem; color: var(--clr-text-muted); }

/* ===== FAQ ===== */
.faq-list { max-width: 760px; margin: 0 auto; display: grid; gap: 12px; }
.faq-item { background: var(--clr-bg-card); border-radius: var(--radius-sm); border: 1px solid var(--clr-border); overflow: hidden; transition: border-color var(--transition); }
.faq-item:hover { border-color: var(--clr-border-hover); }
.faq-item summary { display: flex; align-items: center; justify-content: space-between; padding: 18px 24px; cursor: pointer; font-weight: 500; color: var(--clr-text); list-style: none; transition: background var(--transition); }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary i { color: var(--clr-primary); transition: transform var(--transition); font-size: 0.9rem; }
.faq-item[open] summary i { transform: rotate(180deg); }
.faq-item[open] summary { background: rgba(108, 92, 231, 0.05); }
.faq-item__content { padding: 0 24px 18px; }
.faq-item__content p { font-size: 0.92rem; margin: 0; color: var(--clr-text-secondary); }

/* ===== CTA ===== */
.cta-section { text-align: center; padding: 80px 0; background: linear-gradient(135deg, rgba(108,92,231,0.1) 0%, rgba(10,10,26,0.9) 100%); border-top: 1px solid var(--clr-border); border-bottom: 1px solid var(--clr-border); }
.cta-section h2 { margin-bottom: 16px; }
.cta-section p { font-size: 1.1rem; margin-bottom: 32px; max-width: 520px; margin-left: auto; margin-right: auto; }
.cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ===== Footer ===== */
.site-footer { padding: 48px 0 24px; border-top: 1px solid var(--clr-border); background: var(--clr-bg-section); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 32px; }
.footer-brand .logo { margin-bottom: 16px; }
.footer-brand p { font-size: 0.88rem; color: var(--clr-text-muted); max-width: 300px; }
.footer-col h4 { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 1.5px; color: var(--clr-text-muted); margin-bottom: 16px; }
.footer-col a { display: block; padding: 4px 0; font-size: 0.9rem; color: var(--clr-text-secondary); }
.footer-col a:hover { color: var(--clr-accent); }
.footer-bottom { padding-top: 24px; border-top: 1px solid var(--clr-border); display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; }
.footer-bottom p { font-size: 0.82rem; color: var(--clr-text-muted); margin: 0; }
.footer-social { display: flex; gap: 12px; }
.footer-social a { display: flex; align-items: center; justify-content: center; width: 36px; height: 36px; border-radius: 50%; background: rgba(108, 92, 231, 0.1); color: var(--clr-text-secondary); transition: all var(--transition); }
.footer-social a:hover { background: var(--clr-primary); color: #fff; transform: translateY(-2px); }

/* ===== Empty State ===== */
.empty-state { text-align: center; padding: 48px 24px; background: var(--clr-bg-card); border-radius: var(--radius-md); border: 1px dashed var(--clr-border); }
.empty-state i { font-size: 2.5rem; color: var(--clr-text-muted); margin-bottom: 16px; }
.empty-state p { font-size: 0.95rem; color: var(--clr-text-muted); margin: 0; }

/* ===== Mobile Menu ===== */
@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav-main { position: fixed; top: var(--nav-height); left: 0; right: 0; background: rgba(10, 10, 26, 0.98); backdrop-filter: blur(20px); flex-direction: column; padding: 16px 24px 24px; gap: 4px; transform: translateY(-120%); opacity: 0; transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1); pointer-events: none; border-bottom: 1px solid var(--clr-border); }
  .nav-main.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav-main a { width: 100%; padding: 12px 16px; font-size: 1rem; }
  .nav-main a.active::after { display: none; }
  .nav-main a.active { background: rgba(108, 92, 231, 0.15); border-radius: var(--radius-sm); }
  .hero { min-height: 70vh; padding: calc(var(--nav-height) + 24px) 0 48px; }
  .hero-stats { flex-wrap: wrap; gap: 24px; }
  .intro-grid { grid-template-columns: 1fr; gap: 32px; }
  .intro-image { order: -1; }
  .card-grid--2, .card-grid--3, .card-grid--4 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 520px) {
  .container { padding: 0 16px; }
  .section { padding: 48px 0; }
  .card-grid--2, .card-grid--3, .card-grid--4 { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .cta-actions { flex-direction: column; align-items: center; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-stat h3 { font-size: 1.3rem; }
}

/* ===== Utility ===== */
.text-center { text-align: center; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mt-48 { margin-top: 48px; }
.gap-16 { gap: 16px; }

/* roulang page: article */
:root {
  --clr-primary: #6c5ce7;
  --clr-primary-dark: #5a4bd1;
  --clr-primary-light: #a29bfe;
  --clr-accent: #fd79a8;
  --clr-accent-dark: #e84393;
  --clr-bg: #f8f9fe;
  --clr-bg-alt: #ffffff;
  --clr-bg-dark: #1a1a2e;
  --clr-text: #2d2d44;
  --clr-text-light: #6b7280;
  --clr-text-inverse: #ffffff;
  --clr-border: #e5e7eb;
  --clr-border-light: #f0f0f5;
  --clr-shadow: 0 8px 30px rgba(108, 92, 231, 0.10);
  --clr-shadow-hover: 0 16px 48px rgba(108, 92, 231, 0.18);
  --clr-tag-bg: #f0edff;
  --clr-tag-text: #6c5ce7;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;
  --font-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  font-family: var(--font-base);
  font-size: 16px;
  line-height: 1.7;
  color: var(--clr-text);
  background: var(--clr-bg);
}
img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
a { color: var(--clr-primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--clr-primary-dark); }
a:focus-visible { outline: 3px solid var(--clr-primary-light); outline-offset: 2px; border-radius: 4px; }
h1, h2, h3, h4, h5, h6 { font-family: var(--font-heading); line-height: 1.25; color: var(--clr-text); font-weight: 700; }
h1 { font-size: clamp(1.75rem, 4vw, 2.75rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
h3 { font-size: clamp(1.15rem, 2.2vw, 1.5rem); }
h4 { font-size: 1.15rem; }
p { margin-bottom: 1rem; color: var(--clr-text-light); }
ul, ol { margin-bottom: 1rem; padding-left: 1.5rem; color: var(--clr-text-light); }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--space-sm); }
@media (min-width: 768px) { .container { padding: 0 var(--space-md); } }

/* Header & Navigation */
.site-header {
  background: var(--clr-bg-alt);
  border-bottom: 1px solid var(--clr-border-light);
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(255,255,255,0.92);
}
.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--clr-text);
  text-decoration: none;
  transition: var(--transition);
}
.logo i { color: var(--clr-primary); font-size: 1.5rem; }
.logo span { background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.logo:hover { opacity: 0.85; transform: scale(1.02); }
.nav-main { display: flex; align-items: center; gap: 0.25rem; }
.nav-main a {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1.1rem;
  border-radius: 100px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--clr-text-light);
  text-decoration: none;
  transition: var(--transition);
  position: relative;
}
.nav-main a i { font-size: 0.85rem; }
.nav-main a:hover { background: var(--clr-tag-bg); color: var(--clr-primary); }
.nav-main a.active { background: var(--clr-primary); color: #fff; box-shadow: 0 4px 16px rgba(108,92,231,0.25); }
.nav-main a.active:hover { background: var(--clr-primary-dark); }
.nav-toggle { display: none; background: none; border: none; font-size: 1.4rem; color: var(--clr-text); cursor: pointer; padding: 0.4rem; border-radius: var(--radius-sm); transition: var(--transition); }
.nav-toggle:hover { background: var(--clr-tag-bg); color: var(--clr-primary); }
@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav-main {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--clr-bg-alt);
    flex-direction: column;
    padding: var(--space-sm);
    gap: 0.2rem;
    border-bottom: 1px solid var(--clr-border);
    box-shadow: var(--clr-shadow);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
    border-radius: 0 0 var(--radius-md) var(--radius-md);
  }
  .nav-main.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav-main a { width: 100%; justify-content: center; padding: 0.75rem 1rem; border-radius: var(--radius-sm); }
  .nav-main a i { width: 1.2rem; text-align: center; }
}

/* Footer */
.site-footer {
  background: var(--clr-bg-dark);
  color: rgba(255,255,255,0.85);
  padding: var(--space-lg) 0 var(--space-md);
  margin-top: var(--space-xl);
}
.site-footer .logo span { -webkit-text-fill-color: #fff; background: none; color: #fff; }
.site-footer .logo i { color: var(--clr-primary-light); }
.footer-grid { display: grid; grid-template-columns: 1fr; gap: var(--space-md); margin-bottom: var(--space-md); }
@media (min-width: 640px) { .footer-grid { grid-template-columns: 1.2fr 1fr 1fr 1fr; } }
.footer-brand p { color: rgba(255,255,255,0.6); font-size: 0.95rem; max-width: 340px; margin-top: var(--space-xs); }
.footer-col h4 { color: #fff; font-size: 1rem; margin-bottom: var(--space-sm); font-weight: 600; }
.footer-col a { display: block; color: rgba(255,255,255,0.6); font-size: 0.9rem; padding: 0.3rem 0; transition: var(--transition); }
.footer-col a:hover { color: var(--clr-primary-light); padding-left: 4px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding-top: var(--space-sm); display: flex; flex-direction: column; align-items: center; gap: var(--space-sm); text-align: center; }
@media (min-width: 640px) { .footer-bottom { flex-direction: row; justify-content: space-between; text-align: left; } }
.footer-bottom p { color: rgba(255,255,255,0.5); font-size: 0.85rem; margin: 0; }
.footer-social { display: flex; gap: var(--space-sm); }
.footer-social a { color: rgba(255,255,255,0.5); font-size: 1.2rem; transition: var(--transition); }
.footer-social a:hover { color: var(--clr-primary-light); transform: scale(1.15); }

/* Article Hero */
.article-hero {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  padding: var(--space-lg) 0 var(--space-md);
  position: relative;
  overflow: hidden;
}
.article-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  opacity: 0.12;
  mix-blend-mode: overlay;
}
.article-hero .container { position: relative; z-index: 1; }
.article-hero .breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
  margin-bottom: var(--space-sm);
}
.article-hero .breadcrumb a { color: rgba(255,255,255,0.7); }
.article-hero .breadcrumb a:hover { color: #fff; }
.article-hero .breadcrumb .sep { opacity: 0.4; }
.article-hero h1 {
  color: #fff;
  font-size: clamp(1.6rem, 3.6vw, 2.6rem);
  max-width: 860px;
  line-height: 1.3;
  margin-bottom: var(--space-sm);
}
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-md);
  align-items: center;
  color: rgba(255,255,255,0.7);
  font-size: 0.9rem;
}
.article-meta .tag {
  background: rgba(108,92,231,0.3);
  color: var(--clr-primary-light);
  padding: 0.2rem 0.9rem;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 500;
  border: 1px solid rgba(108,92,231,0.2);
}
.article-meta i { margin-right: 0.3rem; opacity: 0.7; }
.article-meta span { display: flex; align-items: center; }

/* Article Main */
.article-main { padding: var(--space-lg) 0; }
.article-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}
@media (min-width: 992px) {
  .article-layout { grid-template-columns: 1fr 320px; }
}
.article-body {
  background: var(--clr-bg-alt);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  box-shadow: var(--clr-shadow);
  border: 1px solid var(--clr-border-light);
}
@media (min-width: 768px) { .article-body { padding: var(--space-lg); } }
.article-body .featured-image {
  width: 100%;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-md);
  max-height: 480px;
  object-fit: cover;
  box-shadow: 0 4px 20px rgba(0,0,0,0.06);
}
.article-body .content { font-size: 1.05rem; line-height: 1.85; color: var(--clr-text); }
.article-body .content p { margin-bottom: 1.2rem; }
.article-body .content h2, .article-body .content h3 { margin-top: var(--space-md); margin-bottom: var(--space-sm); }
.article-body .content ul, .article-body .content ol { margin-bottom: 1.2rem; }
.article-body .content li { margin-bottom: 0.3rem; }
.article-body .content img { border-radius: var(--radius-sm); margin: var(--space-sm) 0; box-shadow: 0 2px 12px rgba(0,0,0,0.06); }
.article-body .content a { color: var(--clr-primary); text-decoration: underline; text-underline-offset: 2px; }
.article-body .content a:hover { color: var(--clr-primary-dark); }
.article-body .content blockquote {
  border-left: 4px solid var(--clr-primary);
  background: var(--clr-tag-bg);
  padding: var(--space-sm) var(--space-md);
  margin: var(--space-sm) 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--clr-text);
}
.article-body .content code {
  background: #f1f1f6;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.9em;
}
.article-body .not-found-msg { text-align: center; padding: var(--space-lg) 0; color: var(--clr-text-light); font-size: 1.1rem; }
.article-body .back-home { display: inline-flex; align-items: center; gap: 0.5rem; margin-top: var(--space-sm); padding: 0.6rem 1.8rem; background: var(--clr-primary); color: #fff; border-radius: 100px; font-weight: 500; transition: var(--transition); }
.article-body .back-home:hover { background: var(--clr-primary-dark); color: #fff; transform: translateY(-2px); box-shadow: 0 6px 20px rgba(108,92,231,0.3); }

/* Sidebar */
.article-sidebar { display: flex; flex-direction: column; gap: var(--space-md); }
.sidebar-card {
  background: var(--clr-bg-alt);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  box-shadow: var(--clr-shadow);
  border: 1px solid var(--clr-border-light);
}
.sidebar-card h3 { font-size: 1.1rem; margin-bottom: var(--space-sm); display: flex; align-items: center; gap: 0.5rem; }
.sidebar-card h3 i { color: var(--clr-primary); }
.sidebar-card .card-image {
  width: 100%;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-sm);
  max-height: 180px;
  object-fit: cover;
}
.sidebar-card p { font-size: 0.95rem; margin-bottom: var(--space-sm); }
.sidebar-list { list-style: none; padding: 0; margin: 0; }
.sidebar-list li { padding: 0.6rem 0; border-bottom: 1px solid var(--clr-border-light); }
.sidebar-list li:last-child { border-bottom: none; }
.sidebar-list a { display: flex; align-items: center; gap: 0.6rem; color: var(--clr-text-light); font-size: 0.95rem; }
.sidebar-list a:hover { color: var(--clr-primary); padding-left: 4px; }
.sidebar-list a i { color: var(--clr-primary-light); font-size: 0.8rem; }
.sidebar-cta { background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent)); color: #fff; border: none; }
.sidebar-cta h3 { color: #fff; }
.sidebar-cta p { color: rgba(255,255,255,0.85); }
.sidebar-cta .btn-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: #fff;
  color: var(--clr-primary);
  padding: 0.6rem 1.8rem;
  border-radius: 100px;
  font-weight: 600;
  transition: var(--transition);
  margin-top: var(--space-xs);
}
.sidebar-cta .btn-cta:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(0,0,0,0.15); color: var(--clr-primary-dark); }

/* Related Posts Section */
.related-section { padding: 0 0 var(--space-xl); }
.related-section h2 { margin-bottom: var(--space-md); display: flex; align-items: center; gap: 0.6rem; }
.related-section h2 i { color: var(--clr-primary); }
.related-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}
@media (min-width: 600px) { .related-grid { grid-template-columns: 1fr 1fr; } }
@media (min-width: 992px) { .related-grid { grid-template-columns: 1fr 1fr 1fr; } }
.related-card {
  background: var(--clr-bg-alt);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--clr-shadow);
  border: 1px solid var(--clr-border-light);
  transition: var(--transition);
}
.related-card:hover { transform: translateY(-6px); box-shadow: var(--clr-shadow-hover); }
.related-card img { width: 100%; height: 180px; object-fit: cover; border-radius: 0; }
.related-card .card-body { padding: var(--space-sm); }
.related-card .card-body h3 { font-size: 1.05rem; margin-bottom: 0.3rem; }
.related-card .card-body h3 a { color: var(--clr-text); }
.related-card .card-body h3 a:hover { color: var(--clr-primary); }
.related-card .card-body .meta { font-size: 0.85rem; color: var(--clr-text-light); display: flex; gap: var(--space-sm); }

/* Mobile Adapter */
@media (max-width: 520px) {
  .article-body { padding: var(--space-sm); }
  .article-hero { padding: var(--space-md) 0; }
  .article-meta { flex-direction: column; align-items: flex-start; gap: 0.4rem; }
  .related-card img { height: 140px; }
}

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --color-primary: #2563eb;
            --color-primary-dark: #1d4ed8;
            --color-primary-light: #3b82f6;
            --color-primary-bg: #eff6ff;
            --color-secondary: #f59e0b;
            --color-secondary-dark: #d97706;
            --color-accent: #8b5cf6;
            --color-bg: #ffffff;
            --color-bg-alt: #f8fafc;
            --color-bg-dark: #0f172a;
            --color-text: #1e293b;
            --color-text-light: #64748b;
            --color-text-lighter: #94a3b8;
            --color-border: #e2e8f0;
            --color-border-light: #f1f5f9;
            --color-success: #10b981;
            --color-error: #ef4444;
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08), 0 2px 8px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.10), 0 4px 16px rgba(0, 0, 0, 0.05);
            --shadow-xl: 0 24px 60px rgba(0, 0, 0, 0.12);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --spacing-xs: 0.25rem;
            --spacing-sm: 0.5rem;
            --spacing-md: 1rem;
            --spacing-lg: 2rem;
            --spacing-xl: 4rem;
            --spacing-2xl: 6rem;
            --max-width: 1200px;
            --header-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--color-text);
            background: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-top: var(--header-height);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--color-primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--color-primary-dark);
        }
        a:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
            border-radius: 2px;
        }
        button {
            cursor: pointer;
            font-family: inherit;
            font-size: inherit;
            border: none;
            background: none;
        }
        button:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
        }
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--color-text);
        }
        h1 {
            font-size: clamp(2rem, 4.5vw, 3.2rem);
        }
        h2 {
            font-size: clamp(1.5rem, 3vw, 2.2rem);
        }
        h3 {
            font-size: clamp(1.15rem, 1.8vw, 1.4rem);
        }
        h4 {
            font-size: 1.1rem;
        }
        p {
            margin-bottom: 1rem;
            color: var(--color-text-light);
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 var(--spacing-lg);
        }
        .section {
            padding: var(--spacing-xl) 0;
        }
        .section-alt {
            background: var(--color-bg-alt);
        }
        .section-dark {
            background: var(--color-bg-dark);
            color: #e2e8f0;
        }
        .section-dark h2,
        .section-dark h3,
        .section-dark .section-title {
            color: #f1f5f9;
        }
        .section-dark p {
            color: #94a3b8;
        }
        .section-title {
            text-align: center;
            margin-bottom: var(--spacing-lg);
        }
        .section-title h2 {
            position: relative;
            display: inline-block;
        }
        .section-title h2::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background: var(--color-primary);
            border-radius: 4px;
            margin: 0.75rem auto 0;
        }
        .section-title p {
            max-width: 640px;
            margin: 1rem auto 0;
            font-size: 1.05rem;
        }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--color-text-light);
            text-align: center;
            max-width: 680px;
            margin: -0.5rem auto 2rem;
        }

        /* ===== Header / Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-height);
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--color-border-light);
            z-index: 1000;
            transition: box-shadow var(--transition);
        }
        .site-header.scrolled {
            box-shadow: var(--shadow-sm);
        }
        .header-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 var(--spacing-lg);
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 0.6rem;
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--color-text);
            text-decoration: none;
            flex-shrink: 0;
        }
        .logo i {
            color: var(--color-primary);
            font-size: 1.4rem;
        }
        .logo span {
            background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .logo:hover {
            opacity: 0.85;
        }
        .nav-main {
            display: flex;
            align-items: center;
            gap: 0.25rem;
        }
        .nav-main a {
            display: flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.5rem 1.2rem;
            border-radius: var(--radius-sm);
            font-weight: 500;
            color: var(--color-text-light);
            text-decoration: none;
            transition: background var(--transition), color var(--transition);
            position: relative;
            font-size: 0.95rem;
        }
        .nav-main a i {
            font-size: 0.9rem;
            opacity: 0.7;
        }
        .nav-main a:hover {
            color: var(--color-primary);
            background: var(--color-primary-bg);
        }
        .nav-main a.active {
            color: var(--color-primary);
            background: var(--color-primary-bg);
        }
        .nav-main a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--color-primary);
            border-radius: 4px;
        }
        .nav-toggle {
            display: none;
            font-size: 1.4rem;
            color: var(--color-text);
            padding: 0.4rem;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: var(--color-bg-alt);
        }

        /* ===== Hero / Banner ===== */
        .page-banner {
            position: relative;
            padding: var(--spacing-xl) 0 var(--spacing-lg);
            background: linear-gradient(135deg, var(--color-bg-dark) 0%, #1e293b 100%);
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }
        .page-banner .banner-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            opacity: 0.2;
            pointer-events: none;
        }
        .page-banner .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .page-banner h1 {
            color: #ffffff;
            font-weight: 800;
            margin-bottom: 0.75rem;
            letter-spacing: -0.02em;
        }
        .page-banner h1 i {
            color: var(--color-secondary);
            margin-right: 0.5rem;
        }
        .page-banner p {
            color: #94a3b8;
            font-size: 1.15rem;
            max-width: 640px;
            margin: 0 auto 1.5rem;
        }
        .page-banner .banner-meta {
            display: flex;
            justify-content: center;
            gap: 2rem;
            flex-wrap: wrap;
            color: #94a3b8;
            font-size: 0.95rem;
        }
        .page-banner .banner-meta i {
            margin-right: 0.4rem;
            color: var(--color-secondary);
        }
        .breadcrumb {
            display: flex;
            justify-content: center;
            gap: 0.5rem;
            font-size: 0.9rem;
            color: #94a3b8;
            margin-bottom: 1.5rem;
        }
        .breadcrumb a {
            color: #94a3b8;
        }
        .breadcrumb a:hover {
            color: #ffffff;
        }
        .breadcrumb span {
            color: #cbd5e1;
        }

        /* ===== Cards ===== */
        .card {
            background: var(--color-bg);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            transition: transform var(--transition), box-shadow var(--transition);
            border: 1px solid var(--color-border-light);
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .card-img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            display: block;
        }
        .card-body {
            padding: var(--spacing-lg);
        }
        .card-body h3 {
            margin-bottom: 0.5rem;
        }
        .card-body p {
            font-size: 0.95rem;
            color: var(--color-text-light);
            margin-bottom: 0;
        }
        .card-tag {
            display: inline-block;
            padding: 0.2rem 0.8rem;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 500;
            background: var(--color-primary-bg);
            color: var(--color-primary);
            margin-bottom: 0.75rem;
        }
        .card-tag.secondary {
            background: #fef3c7;
            color: #d97706;
        }
        .card-tag.accent {
            background: #f3e8ff;
            color: #7c3aed;
        }

        /* ===== Grid ===== */
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--spacing-lg);
        }
        .grid-3 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: var(--spacing-lg);
        }
        .grid-4 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr 1fr;
            gap: var(--spacing-lg);
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.7rem 1.8rem;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
            border: none;
            cursor: pointer;
            text-decoration: none;
        }
        .btn:hover {
            transform: translateY(-1px);
        }
        .btn:active {
            transform: translateY(0);
        }
        .btn-primary {
            background: var(--color-primary);
            color: #ffffff;
        }
        .btn-primary:hover {
            background: var(--color-primary-dark);
            color: #ffffff;
            box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
        }
        .btn-secondary {
            background: var(--color-secondary);
            color: #ffffff;
        }
        .btn-secondary:hover {
            background: var(--color-secondary-dark);
            color: #ffffff;
            box-shadow: 0 4px 14px rgba(245, 158, 11, 0.35);
        }
        .btn-outline {
            background: transparent;
            color: var(--color-primary);
            border: 2px solid var(--color-primary);
        }
        .btn-outline:hover {
            background: var(--color-primary);
            color: #ffffff;
        }
        .btn-white {
            background: #ffffff;
            color: var(--color-primary);
        }
        .btn-white:hover {
            background: #f1f5f9;
            color: var(--color-primary-dark);
        }
        .btn-lg {
            padding: 1rem 2.5rem;
            font-size: 1.05rem;
            border-radius: var(--radius-md);
        }

        /* ===== Steps / Timeline ===== */
        .steps {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: var(--spacing-lg);
            counter-reset: step;
        }
        .step-item {
            text-align: center;
            padding: var(--spacing-lg);
            background: var(--color-bg);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--color-border-light);
            position: relative;
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .step-item:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
        }
        .step-item::before {
            counter-increment: step;
            content: counter(step);
            display: flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--color-primary);
            color: #ffffff;
            font-weight: 700;
            font-size: 1.2rem;
            margin: 0 auto 1rem;
        }
        .step-item h4 {
            margin-bottom: 0.5rem;
        }
        .step-item p {
            font-size: 0.92rem;
            color: var(--color-text-light);
            margin-bottom: 0;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: var(--spacing-md);
        }
        .faq-item {
            background: var(--color-bg);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--color-border-light);
            overflow: hidden;
            transition: box-shadow var(--transition);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-md);
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1.2rem 1.5rem;
            font-weight: 600;
            cursor: pointer;
            background: none;
            width: 100%;
            text-align: left;
            color: var(--color-text);
            font-size: 1rem;
            transition: background var(--transition);
        }
        .faq-question:hover {
            background: var(--color-bg-alt);
        }
        .faq-question i {
            color: var(--color-primary);
            transition: transform var(--transition);
            font-size: 1.1rem;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 1.5rem 1.2rem;
            color: var(--color-text-light);
            font-size: 0.95rem;
            line-height: 1.7;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
            padding: var(--spacing-xl) 0;
            text-align: center;
            color: #ffffff;
        }
        .cta-section h2 {
            color: #ffffff;
            margin-bottom: 0.75rem;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.85);
            max-width: 600px;
            margin: 0 auto 1.5rem;
            font-size: 1.05rem;
        }
        .cta-section .btn-white {
            font-size: 1.05rem;
            padding: 0.9rem 2.4rem;
        }

        /* ===== Feature Blocks ===== */
        .feature-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--spacing-xl);
            align-items: center;
            padding: var(--spacing-lg) 0;
        }
        .feature-block.reverse {
            direction: rtl;
        }
        .feature-block.reverse>* {
            direction: ltr;
        }
        .feature-img {
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-lg);
            width: 100%;
            aspect-ratio: 4 / 3;
            object-fit: cover;
        }
        .feature-text h3 {
            margin-bottom: 0.75rem;
        }
        .feature-text p {
            color: var(--color-text-light);
            margin-bottom: 1rem;
        }
        .feature-text .feature-list {
            display: flex;
            flex-direction: column;
            gap: 0.6rem;
        }
        .feature-text .feature-list li {
            display: flex;
            align-items: center;
            gap: 0.6rem;
            color: var(--color-text);
        }
        .feature-text .feature-list li i {
            color: var(--color-success);
            font-size: 1rem;
        }

        /* ===== Tags ===== */
        .tag-group {
            display: flex;
            flex-wrap: wrap;
            gap: 0.6rem;
            justify-content: center;
        }
        .tag {
            display: inline-block;
            padding: 0.35rem 1rem;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 500;
            background: var(--color-bg-alt);
            color: var(--color-text-light);
            border: 1px solid var(--color-border);
            transition: background var(--transition), color var(--transition), border-color var(--transition);
        }
        .tag:hover {
            background: var(--color-primary-bg);
            color: var(--color-primary);
            border-color: var(--color-primary);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--color-bg-dark);
            color: #94a3b8;
            padding: var(--spacing-xl) 0 var(--spacing-lg);
        }
        .site-footer .logo {
            color: #f1f5f9;
            margin-bottom: 1rem;
        }
        .site-footer .logo i {
            color: var(--color-primary-light);
        }
        .site-footer .logo span {
            background: linear-gradient(135deg, #f1f5f9, #94a3b8);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: var(--spacing-xl);
            padding-bottom: var(--spacing-lg);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.7;
            max-width: 360px;
        }
        .footer-col h4 {
            color: #f1f5f9;
            font-size: 0.95rem;
            margin-bottom: 1rem;
            font-weight: 600;
        }
        .footer-col a {
            display: block;
            color: #94a3b8;
            font-size: 0.9rem;
            padding: 0.3rem 0;
            transition: color var(--transition);
        }
        .footer-col a:hover {
            color: #ffffff;
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: var(--spacing-lg);
            font-size: 0.85rem;
            flex-wrap: wrap;
            gap: var(--spacing-md);
        }
        .footer-bottom p {
            margin-bottom: 0;
            color: #64748b;
        }
        .footer-social {
            display: flex;
            gap: 1rem;
        }
        .footer-social a {
            color: #64748b;
            font-size: 1.2rem;
            transition: color var(--transition);
        }
        .footer-social a:hover {
            color: var(--color-primary-light);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: 1fr 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: var(--spacing-lg);
            }
            .feature-block {
                gap: var(--spacing-lg);
            }
        }

        @media (max-width: 768px) {
            :root {
                --header-height: 64px;
                --spacing-xl: 2.5rem;
                --spacing-2xl: 3.5rem;
            }
            .nav-main {
                position: fixed;
                top: var(--header-height);
                left: 0;
                width: 100%;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(12px);
                -webkit-backdrop-filter: blur(12px);
                flex-direction: column;
                padding: var(--spacing-md);
                gap: 0.25rem;
                border-bottom: 1px solid var(--color-border);
                transform: translateY(-120%);
                opacity: 0;
                transition: transform 0.35s ease, opacity 0.35s ease;
                box-shadow: var(--shadow-md);
                border-radius: 0 0 var(--radius-md) var(--radius-md);
                pointer-events: none;
            }
            .nav-main.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav-main a {
                padding: 0.8rem 1.2rem;
                width: 100%;
                border-radius: var(--radius-sm);
                justify-content: center;
            }
            .nav-main a.active::after {
                bottom: 4px;
            }
            .nav-toggle {
                display: block;
            }
            .grid-2,
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
            }
            .feature-block {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .feature-block.reverse {
                direction: ltr;
            }
            .feature-block .feature-list li {
                justify-content: center;
            }
            .page-banner {
                min-height: 260px;
                padding: var(--spacing-lg) 0;
            }
            .page-banner h1 {
                font-size: 1.8rem;
            }
            .page-banner p {
                font-size: 1rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .footer-brand p {
                margin: 0 auto;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .steps {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 var(--spacing-md);
            }
            .steps {
                grid-template-columns: 1fr;
            }
            .page-banner .banner-meta {
                flex-direction: column;
                gap: 0.5rem;
            }
            .btn-lg {
                padding: 0.8rem 1.8rem;
                font-size: 0.95rem;
            }
            .section-title h2 {
                font-size: 1.4rem;
            }
        }

        /* ===== Utility ===== */
        .text-center {
            text-align: center;
        }
        .mt-1 {
            margin-top: var(--spacing-md);
        }
        .mt-2 {
            margin-top: var(--spacing-lg);
        }
        .mt-3 {
            margin-top: var(--spacing-xl);
        }
        .mb-1 {
            margin-bottom: var(--spacing-md);
        }
        .mb-2 {
            margin-bottom: var(--spacing-lg);
        }
        .gap-1 {
            gap: var(--spacing-md);
        }
        .flex-center {
            display: flex;
            justify-content: center;
            align-items: center;
        }

        /* ===== Floating ===== */
        .float-card {
            background: var(--color-bg);
            border-radius: var(--radius-md);
            padding: var(--spacing-lg);
            box-shadow: var(--shadow-md);
            border: 1px solid var(--color-border-light);
        }

        /* ===== Divider ===== */
        .divider {
            width: 60px;
            height: 3px;
            background: var(--color-primary);
            border-radius: 4px;
            margin: 1rem auto;
        }
        .divider.light {
            background: rgba(255, 255, 255, 0.3);
        }