/* Đi Đâu AI — shared web styles aligned with app AppColorTokens */
:root {
  --bg: #f4f6f9;
  --surface: #ffffff;
  --surface-muted: #f3f4f6;
  --primary: #0052ff;
  --primary-light: #e6f0ff;
  --secondary: #7c5cff;
  --text: #1a1a1a;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  --border: #e5e7eb;
  --success: #16a34a;
  --radius: 16px;
  --radius-pill: 999px;
  --shadow: 0 4px 14px rgba(15, 23, 42, 0.06);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI",
    "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 20px 16px 64px;
}

.wrap-wide {
  max-width: 960px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
}

.brand:hover {
  text-decoration: none;
}

.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  box-shadow: 0 6px 16px rgba(0, 82, 255, 0.28);
}

.nav-links {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-link {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 8px 12px;
  border-radius: var(--radius-pill);
  text-decoration: none;
}

.nav-link:hover,
.nav-link.is-active {
  color: var(--primary);
  background: var(--primary-light);
  text-decoration: none;
}

.page-title {
  margin: 8px 0 6px;
  font-size: clamp(1.6rem, 4vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.page-meta {
  margin: 0 0 22px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 18px;
}

.card + .card {
  margin-top: 14px;
}

.card h2 {
  margin: 0 0 10px;
  font-size: 1.05rem;
  font-weight: 700;
}

.card h2.section {
  margin-top: 1.35rem;
}

.card p,
.card li {
  color: var(--text-secondary);
}

.card p:first-of-type {
  margin-top: 0;
}

.card ul {
  padding-left: 1.15rem;
  margin: 0.4rem 0 0;
}

.card li {
  margin: 0.35rem 0;
}

.card li strong {
  color: var(--text);
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 0;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: var(--radius-pill);
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.82rem;
  font-weight: 600;
}

.btn {
  appearance: none;
  border: 0;
  border-radius: var(--radius-pill);
  padding: 12px 18px;
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
}

.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 8px 20px rgba(0, 82, 255, 0.25);
}

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

details {
  border-top: 1px solid var(--border);
  padding: 12px 0;
}

details:first-of-type {
  border-top: 0;
  padding-top: 0;
}

summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--text);
  list-style: none;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "+";
  float: right;
  color: var(--primary);
  font-weight: 700;
}

details[open] summary::after {
  content: "–";
}

details p {
  margin: 8px 0 0;
  color: var(--text-secondary);
}

.site-footer {
  margin-top: 36px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
}

.site-footer a {
  color: var(--text-secondary);
  font-weight: 600;
}

/* Marketing hero */
.hero {
  margin-top: 12px;
  display: grid;
  gap: 20px;
}

@media (min-width: 860px) {
  .hero {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: center;
    gap: 28px;
    min-height: 62vh;
  }
}

.hero h1 {
  margin: 0 0 14px;
  font-size: clamp(2.1rem, 5.5vw, 3.4rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.08;
}

.hero .lede {
  margin: 0 0 22px;
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 34rem;
}

.feature-grid {
  display: grid;
  gap: 10px;
}

.feature {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 12px;
  align-items: start;
  padding: 14px;
  border-radius: 14px;
  background: var(--surface-muted);
}

.feature-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: var(--primary-light);
  color: var(--primary);
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 0.9rem;
}

.feature strong {
  display: block;
  margin-bottom: 2px;
}

.feature span {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.panel-title {
  margin: 0 0 14px;
  font-size: 1rem;
  font-weight: 700;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: var(--radius-pill);
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 700;
  margin-bottom: 14px;
}