@import url("https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@400;500;600;700;800&display=swap");

/* ══════════════════════════════════════════
   THAMTU24H Premium Design System v3
   Tông: Navy Blue + Gold — Professional
   Updated: 2026-08-26
   ══════════════════════════════════════════ */

:root {
  --tt-navy: #0a2540;
  --tt-navy-light: #1a3a5c;
  --tt-navy-soft: #2c4f7c;
  --tt-blue: #0070f3;
  --tt-blue-light: #3291ff;
  --tt-blue-glow: rgba(0,112,243,0.12);
  --tt-gold: #e8a838;
  --tt-gold-light: #f5c563;
  --tt-gold-soft: #fdf3e0;
  --tt-green: #10b981;
  --tt-red: #ef4444;
  --tt-bg: #f8fafc;
  --tt-bg-warm: #fafbfd;
  --tt-card: #ffffff;
  --tt-text: #1e293b;
  --tt-text-soft: #475569;
  --tt-text-muted: #94a3b8;
  --tt-border: #e2e8f0;
  --tt-border-soft: #f1f5f9;
  --tt-r: 14px;
  --tt-r-sm: 8px;
  --tt-r-lg: 20px;
  --tt-r-xl: 28px;
  --tt-shadow-sm: 0 2px 8px rgba(0,0,0,0.05);
  --tt-shadow: 0 4px 20px rgba(0,0,0,0.07);
  --tt-shadow-lg: 0 12px 40px rgba(0,0,0,0.1);
  --tt-shadow-blue: 0 8px 30px rgba(0,112,243,0.18);
  --tt-shadow-navy: 0 8px 30px rgba(10,37,64,0.2);
  --tt-ease: cubic-bezier(0.4, 0, 0.2, 1);
  --tt-font: "Be Vietnam Pro", -apple-system, "Segoe UI", sans-serif;
}

/* ── Global ────────────────────────────── */
html { scroll-behavior: smooth !important; }

/* ── Deep Content ─────────────────────── */
.seo-deep-content {
  font-family: var(--tt-font) !important;
  color: var(--tt-text) !important;
  line-height: 1.8 !important;
}

/* Headings H2 */
.seo-deep-content h2 {
  font-family: var(--tt-font) !important;
  font-size: 24px !important;
  font-weight: 700 !important;
  color: var(--tt-navy) !important;
  margin: 40px 0 18px !important;
  padding: 14px 0 14px 18px !important;
  background: linear-gradient(90deg, rgba(0,112,243,0.06) 0%, transparent 100%) !important;
  border-left: 4px solid var(--tt-blue) !important;
  border-bottom: none !important;
  border-radius: 0 var(--tt-r-sm) var(--tt-r-sm) 0 !important;
  position: relative !important;
  letter-spacing: -0.01em !important;
}

.seo-deep-content h2::after { content: none !important; }

/* Headings H3 */
.seo-deep-content h3 {
  font-family: var(--tt-font) !important;
  font-size: 18px !important;
  font-weight: 600 !important;
  color: var(--tt-navy) !important;
  margin: 28px 0 12px !important;
  padding: 0 0 0 0 !important;
  border-left: none !important;
  position: relative !important;
}

.seo-deep-content h3::before {
  content: "●" !important;
  color: var(--tt-blue) !important;
  margin-right: 8px !important;
  font-size: 10px !important;
  vertical-align: middle !important;
}

/* Paragraphs */
.seo-deep-content p {
  font-size: 15px !important;
  line-height: 1.85 !important;
  color: var(--tt-text-soft) !important;
  margin-bottom: 14px !important;
}

.seo-deep-content strong {
  color: var(--tt-navy) !important;
  font-weight: 600 !important;
}

/* Lists */
.seo-deep-content ul, .seo-deep-content ol {
  padding-left: 0 !important;
  list-style: none !important;
  margin: 14px 0 18px !important;
}

.seo-deep-content ul li {
  position: relative !important;
  padding: 10px 12px 10px 36px !important;
  font-size: 14.5px !important;
  color: var(--tt-text-soft) !important;
  background: var(--tt-bg) !important;
  border-radius: var(--tt-r-sm) !important;
  margin-bottom: 6px !important;
  border-bottom: none !important;
  transition: all 0.2s var(--tt-ease) !important;
}

.seo-deep-content ul li:hover {
  background: var(--tt-blue-glow) !important;
  transform: translateX(3px) !important;
}

.seo-deep-content ul li::before {
  content: "✓" !important;
  position: absolute !important;
  left: 12px !important;
  color: var(--tt-green) !important;
  font-weight: 700 !important;
  font-size: 13px !important;
  top: 11px !important;
}

.seo-deep-content ol { counter-reset: item !important; }
.seo-deep-content ol li {
  counter-increment: item !important;
  position: relative !important;
  padding: 14px 14px 14px 52px !important;
  font-size: 14.5px !important;
  color: var(--tt-text-soft) !important;
  background: var(--tt-card) !important;
  border: 1px solid var(--tt-border-soft) !important;
  border-radius: var(--tt-r) !important;
  margin-bottom: 8px !important;
  border-bottom: none !important;
  transition: all 0.2s var(--tt-ease) !important;
}

.seo-deep-content ol li:hover {
  border-color: var(--tt-blue) !important;
  box-shadow: var(--tt-shadow-sm) !important;
}

.seo-deep-content ol li::before {
  content: counter(item) !important;
  position: absolute !important;
  left: 14px !important;
  top: 12px !important;
  width: 26px !important;
  height: 26px !important;
  background: linear-gradient(135deg, var(--tt-navy) 0%, var(--tt-navy-soft) 100%) !important;
  color: #fff !important;
  border-radius: 50% !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  font-size: 12px !important;
  font-weight: 700 !important;
}

/* Tables */
.seo-deep-content table {
  width: 100% !important;
  border-collapse: separate !important;
  border-spacing: 0 !important;
  border-radius: var(--tt-r) !important;
  overflow: hidden !important;
  box-shadow: var(--tt-shadow) !important;
  margin: 20px 0 !important;
  border: 1px solid var(--tt-border) !important;
}

.seo-deep-content table tr:first-child th,
.seo-deep-content table tr:first-child td {
  background: linear-gradient(135deg, var(--tt-navy) 0%, var(--tt-navy-light) 100%) !important;
  color: #fff !important;
  font-weight: 600 !important;
  font-size: 13px !important;
  text-transform: uppercase !important;
  letter-spacing: 0.06em !important;
  padding: 14px 16px !important;
}

.seo-deep-content table td {
  padding: 12px 16px !important;
  font-size: 14px !important;
  border-bottom: 1px solid var(--tt-border-soft) !important;
}

.seo-deep-content table tr:nth-child(even) td { background: var(--tt-bg) !important; }
.seo-deep-content table tr:hover td { background: var(--tt-blue-glow) !important; }

/* Stats Cards Grid */
.seo-deep-content > div[style*="display:flex"] {
  display: grid !important;
  grid-template-columns: repeat(4, 1fr) !important;
  gap: 14px !important;
  margin: 24px 0 !important;
}

.seo-deep-content > div[style*="display:flex"] > div {
  background: var(--tt-card) !important;
  border: 1px solid var(--tt-border) !important;
  border-radius: var(--tt-r) !important;
  padding: 24px 16px !important;
  text-align: center !important;
  transition: all 0.25s var(--tt-ease) !important;
  min-width: unset !important;
  flex: unset !important;
}

.seo-deep-content > div[style*="display:flex"] > div:hover {
  transform: translateY(-4px) !important;
  box-shadow: var(--tt-shadow-blue) !important;
  border-color: var(--tt-blue) !important;
}

.seo-deep-content > div[style*="display:flex"] > div > div:first-child {
  font-size: 32px !important;
  font-weight: 800 !important;
  color: var(--tt-blue) !important;
  background: none !important;
  -webkit-text-fill-color: unset !important;
  margin-bottom: 4px !important;
}

.seo-deep-content > div[style*="display:flex"] > div > div:last-child {
  color: var(--tt-text-muted) !important;
  font-size: 12px !important;
  font-weight: 600 !important;
  text-transform: uppercase !important;
  letter-spacing: 0.08em !important;
}

/* Timeline */
.seo-deep-content > div[style*="border-left:3px"] {
  border-left: 2px solid var(--tt-border) !important;
  border-image: none !important;
  padding-left: 22px !important;
  margin: 24px 0 !important;
  position: relative !important;
}

.seo-deep-content > div[style*="border-left:3px"] p {
  padding: 12px 16px !important;
  background: var(--tt-card) !important;
  border-radius: var(--tt-r-sm) !important;
  margin-bottom: 10px !important;
  box-shadow: var(--tt-shadow-sm) !important;
  border: 1px solid var(--tt-border-soft) !important;
  transition: all 0.2s var(--tt-ease) !important;
  position: relative !important;
  font-size: 14px !important;
}

.seo-deep-content > div[style*="border-left:3px"] p::before {
  content: "" !important;
  position: absolute !important;
  left: -30px !important;
  top: 16px !important;
  width: 10px !important;
  height: 10px !important;
  background: var(--tt-blue) !important;
  border-radius: 50% !important;
  border: 2px solid var(--tt-card) !important;
  box-shadow: 0 0 0 2px var(--tt-blue) !important;
}

.seo-deep-content > div[style*="border-left:3px"] p:hover {
  border-color: var(--tt-blue) !important;
  transform: translateX(3px) !important;
}

.seo-deep-content > div[style*="border-left:3px"] p strong:first-child {
  display: inline-block !important;
  background: var(--tt-navy) !important;
  color: #fff !important;
  padding: 2px 10px !important;
  border-radius: var(--tt-r-sm) !important;
  font-size: 12px !important;
  margin-right: 6px !important;
  font-weight: 700 !important;
}

/* ── TOC ──────────────────────────────── */
.seo-toc {
  background: var(--tt-card) !important;
  border: 1px solid var(--tt-border) !important;
  border-radius: var(--tt-r) !important;
  padding: 22px 24px !important;
  margin: 20px 0 28px !important;
  max-width: 620px !important;
  box-shadow: var(--tt-shadow-sm) !important;
}

.seo-toc::before { content: none !important; }

.seo-toc h4 {
  font-family: var(--tt-font) !important;
  font-size: 15px !important;
  font-weight: 700 !important;
  color: var(--tt-navy) !important;
  margin: 0 0 14px !important;
  padding-bottom: 10px !important;
  border-bottom: 1px solid var(--tt-border) !important;
}

.seo-toc ul { list-style: none !important; padding: 0 !important; margin: 0 !important; }
.seo-toc li { padding: 3px 0 !important; border-bottom: none !important; }
.seo-toc li::before { content: none !important; }

.seo-toc a {
  font-family: var(--tt-font) !important;
  color: var(--tt-blue) !important;
  font-size: 14px !important;
  font-weight: 500 !important;
  text-decoration: none !important;
  padding: 5px 10px !important;
  border-radius: var(--tt-r-sm) !important;
  display: inline-block !important;
  transition: all 0.2s var(--tt-ease) !important;
}

.seo-toc a:hover {
  background: var(--tt-blue) !important;
  color: #fff !important;
}

/* ── FAQ ──────────────────────────────── */
.seo-faq-section {
  background: var(--tt-bg) !important;
  border: 1px solid var(--tt-border) !important;
  border-radius: var(--tt-r) !important;
  padding: 28px !important;
  margin: 32px 0 !important;
  box-shadow: none !important;
}

.seo-faq-section h2 {
  font-family: var(--tt-font) !important;
  font-size: 20px !important;
  font-weight: 700 !important;
  color: var(--tt-navy) !important;
  margin: 0 0 20px !important;
  padding: 0 0 12px !important;
  border-bottom: 2px solid var(--tt-border) !important;
  background: none !important;
  border-left: none !important;
  border-radius: 0 !important;
}

.seo-faq-section h2::after { content: none !important; }

.seo-faq-section > div {
  background: var(--tt-card) !important;
  border: 1px solid var(--tt-border-soft) !important;
  border-radius: var(--tt-r-sm) !important;
  padding: 18px !important;
  margin-bottom: 10px !important;
  border-bottom: none !important;
  transition: all 0.2s var(--tt-ease) !important;
}

.seo-faq-section > div:last-child { margin-bottom: 0 !important; }

.seo-faq-section > div:hover {
  border-color: var(--tt-blue) !important;
  box-shadow: var(--tt-shadow-sm) !important;
}

.seo-faq-section h3 {
  font-family: var(--tt-font) !important;
  font-size: 15px !important;
  font-weight: 600 !important;
  color: var(--tt-navy) !important;
  margin: 0 0 8px !important;
  padding-left: 0 !important;
  border-left: none !important;
  line-height: 1.45 !important;
}

.seo-faq-section h3::before { content: none !important; }

.seo-faq-section p {
  font-size: 14px !important;
  line-height: 1.7 !important;
  color: var(--tt-text-soft) !important;
  margin: 0 !important;
}

/* ── CTA Box ─────────────────────────── */
.seo-cta-box {
  background: linear-gradient(135deg, var(--tt-navy) 0%, var(--tt-navy-light) 100%) !important;
  border: none !important;
  border-radius: var(--tt-r-lg) !important;
  padding: 36px 28px !important;
  text-align: center !important;
  margin: 32px 0 !important;
  overflow: hidden !important;
  box-shadow: var(--tt-shadow-navy) !important;
  position: relative !important;
}

.seo-cta-box::before, .seo-cta-box::after { content: none !important; }

.seo-cta-box h3 {
  font-family: var(--tt-font) !important;
  color: #fff !important;
  font-size: 20px !important;
  font-weight: 700 !important;
  margin: 0 0 10px !important;
  position: relative !important;
  z-index: 1 !important;
  border-left: none !important;
  padding-left: 0 !important;
}

.seo-cta-box h3::before { content: none !important; }

.seo-cta-box p {
  color: rgba(255,255,255,0.8) !important;
  font-size: 14px !important;
  line-height: 1.65 !important;
  margin-bottom: 18px !important;
  max-width: 520px !important;
  margin-left: auto !important;
  margin-right: auto !important;
}

.seo-cta-box a {
  display: inline-block !important;
  background: var(--tt-gold) !important;
  color: var(--tt-navy) !important;
  padding: 12px 32px !important;
  border-radius: var(--tt-r-sm) !important;
  font-family: var(--tt-font) !important;
  font-weight: 700 !important;
  font-size: 15px !important;
  text-decoration: none !important;
  transition: all 0.25s var(--tt-ease) !important;
  box-shadow: 0 4px 12px rgba(232,168,56,0.3) !important;
}

.seo-cta-box a:hover {
  background: var(--tt-gold-light) !important;
  transform: translateY(-2px) !important;
  box-shadow: 0 6px 20px rgba(232,168,56,0.4) !important;
}

/* ── Internal Links ──────────────────── */
.seo-internal-links {
  background: var(--tt-bg) !important;
  border: 1px solid var(--tt-border) !important;
  border-radius: var(--tt-r) !important;
  padding: 24px !important;
  margin: 28px 0 !important;
  box-shadow: none !important;
}

.seo-internal-links h3 {
  font-family: var(--tt-font) !important;
  font-size: 16px !important;
  font-weight: 700 !important;
  color: var(--tt-navy) !important;
  margin: 0 0 16px !important;
  padding-bottom: 12px !important;
  border-bottom: 1px solid var(--tt-border) !important;
  border-left: none !important;
  padding-left: 0 !important;
}

.seo-internal-links h3::before { content: none !important; }

.seo-internal-links ul {
  display: grid !important;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)) !important;
  gap: 8px !important;
  list-style: none !important;
  padding: 0 !important;
  margin: 0 !important;
}

.seo-internal-links li { padding: 0 !important; border-bottom: none !important; }
.seo-internal-links li::before { content: none !important; }

.seo-internal-links a {
  display: block !important;
  padding: 10px 14px !important;
  background: var(--tt-card) !important;
  border: 1px solid var(--tt-border-soft) !important;
  border-radius: var(--tt-r-sm) !important;
  color: var(--tt-blue) !important;
  font-family: var(--tt-font) !important;
  font-size: 13.5px !important;
  font-weight: 500 !important;
  text-decoration: none !important;
  transition: all 0.2s var(--tt-ease) !important;
}

.seo-internal-links a::before {
  content: "→ " !important;
  color: var(--tt-blue) !important;
  font-weight: 700 !important;
}

.seo-internal-links a:hover {
  background: var(--tt-blue) !important;
  color: #fff !important;
  border-color: var(--tt-blue) !important;
}

.seo-internal-links a:hover::before { color: #fff !important; }

/* ── SEO Intro ───────────────────────── */
.seo-intro {
  background: var(--tt-bg) !important;
  border-left: 3px solid var(--tt-blue) !important;
  border-radius: 0 var(--tt-r-sm) var(--tt-r-sm) 0 !important;
  padding: 18px 20px !important;
  margin-bottom: 24px !important;
}

.seo-intro p {
  font-size: 15px !important;
  line-height: 1.75 !important;
  margin: 0 !important;
  color: var(--tt-text-soft) !important;
}

/* ── Contact Box ─────────────────────── */
.seo-deep-content > div[style*="background:#f0f7ff"][style*="border:2px"] {
  background: linear-gradient(135deg, var(--tt-navy) 0%, var(--tt-navy-light) 100%) !important;
  border: none !important;
  border-radius: var(--tt-r) !important;
  padding: 28px !important;
  box-shadow: var(--tt-shadow-navy) !important;
}

.seo-deep-content > div[style*="background:#f0f7ff"][style*="border:2px"] p {
  color: #fff !important;
}

.seo-deep-content > div[style*="background:#f0f7ff"][style*="border:2px"] p:first-child {
  font-size: 24px !important;
  font-weight: 800 !important;
  color: var(--tt-gold) !important;
  background: none !important;
  -webkit-text-fill-color: unset !important;
}

/* ── Mobile ──────────────────────────── */
@media (max-width: 768px) {
  .seo-deep-content h2 { font-size: 20px !important; }
  .seo-deep-content h3 { font-size: 16px !important; }
  .seo-faq-section { padding: 18px !important; }
  .seo-cta-box { padding: 24px 18px !important; }
  .seo-internal-links ul { grid-template-columns: 1fr !important; }
  .seo-deep-content > div[style*="display:flex"] { grid-template-columns: repeat(2, 1fr) !important; }
}

@media (max-width: 480px) {
  .seo-deep-content > div[style*="display:flex"] { grid-template-columns: 1fr 1fr !important; gap: 8px !important; }
  .seo-deep-content > div[style*="display:flex"] > div { padding: 16px 10px !important; }
  .seo-deep-content > div[style*="display:flex"] > div > div:first-child { font-size: 26px !important; }
}

@media print {
  .seo-cta-box, .seo-internal-links, .seo-toc { display: none !important; }
}