/* Khung trang của theme; kiểu của bàn cờ và các bảng nằm trong atlas.css (sinh từ web/style.css). */
.site-head {
  max-width: 1080px; margin: 0 auto; padding: 14px 16px;
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
  border-bottom: 1px solid var(--rule);
}
.brand { font-weight: 700; font-size: 18px; color: var(--ink); text-decoration: none; letter-spacing: -0.01em; }
.site-nav { display: flex; gap: 16px; flex: 1; flex-wrap: wrap; }
.site-nav a { color: var(--muted); text-decoration: none; font-size: 15px; }
.site-nav a:hover { color: var(--accent); }

.lang-menu { position: relative; font-size: 14px; }
.lang-menu summary {
  list-style: none; cursor: pointer; padding: 6px 12px;
  border: 1px solid var(--rule); border-radius: 8px; background: var(--card);
}
.lang-menu summary::-webkit-details-marker { display: none; }
.lang-menu ul {
  position: absolute; right: 0; top: calc(100% + 6px); z-index: 10; margin: 0; padding: 6px; list-style: none;
  background: var(--card); border: 1px solid var(--rule); border-radius: 10px; min-width: 190px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.14);
}
.lang-menu a { display: block; padding: 7px 10px; border-radius: 6px; color: var(--ink); text-decoration: none; }
.lang-menu a:hover, .lang-menu a[aria-current] { background: color-mix(in srgb, var(--accent) 12%, transparent); }

.hero { max-width: 1080px; margin: 0 auto; padding: 44px 16px 0; }
.hero h1 { font-size: 40px; line-height: 1.12; max-width: 18em; }
.lead { font-size: 18px; color: var(--muted); max-width: 44em; margin: 12px 0 0; }
.top .lead { font-size: 16px; }
@media (max-width: 520px) { .hero h1 { font-size: 30px; } }

a.card { text-decoration: none; display: block; }
.more { margin: 14px 0 0; }
.more a, .kicker a, .prose a { color: var(--accent); text-decoration: none; }
.more a:hover, .kicker a:hover { text-decoration: underline; }
.rank td.name a { color: inherit; text-decoration: none; display: block; }
.rank td.name a:hover b { color: var(--accent); }
h1.big { font-size: 30px; line-height: 1.2; margin: 0 0 8px; }
.card .wdl { margin: 8px 0 4px; }
.prose { max-width: 44em; }

/* ---------- Khung chung: đầu trang dính, nút, tiêu đề mục ---------- */
body { -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
.site-head {
  position: sticky; top: 0; z-index: 20; max-width: none; padding: 12px max(16px, calc((100% - 1048px) / 2));
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  -webkit-backdrop-filter: saturate(1.4) blur(12px); backdrop-filter: saturate(1.4) blur(12px);
}
.brand { display: inline-flex; align-items: center; gap: 9px; }
.brand::before {
  content: ""; width: 22px; height: 22px; border-radius: 6px; background: var(--accent);
  background-image: linear-gradient(45deg, rgba(255, 255, 255, 0.9) 25%, transparent 25%, transparent 75%, rgba(255, 255, 255, 0.9) 75%),
    linear-gradient(45deg, rgba(255, 255, 255, 0.9) 25%, transparent 25%, transparent 75%, rgba(255, 255, 255, 0.9) 75%);
  background-size: 11px 11px; background-position: 0 0, 5.5px 5.5px;
}
.btn {
  display: inline-flex; align-items: center; padding: 11px 20px; border-radius: 999px; font-weight: 600; font-size: 15px;
  text-decoration: none; color: var(--ink); background: var(--card); border: 1px solid var(--rule);
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.btn:hover { transform: translateY(-1px); border-color: var(--accent); box-shadow: 0 6px 18px rgba(20, 40, 32, 0.1); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--bg); }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 16px; }
.section-head h2 { font-size: 24px; letter-spacing: -0.015em; margin: 0; }
.section-head a { color: var(--accent); text-decoration: none; font-weight: 600; font-size: 15px; white-space: nowrap; }
.section-head a:hover { text-decoration: underline; }
.block { margin-top: 64px; }
.card, .trap-card { transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease; }
a.card:hover, .trap-card:hover { transform: translateY(-2px); border-color: var(--accent); box-shadow: 0 10px 28px rgba(20, 40, 32, 0.1); }
footer { border-top: 1px solid var(--rule); padding-top: 22px; margin-top: 72px; }

/* ---------- Trang chủ ---------- */
.home-hero {
  max-width: 1080px; margin: 0 auto; padding: 56px 16px 8px;
  display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); gap: 48px; align-items: center;
}
.home-hero h1 { font-size: clamp(34px, 5.2vw, 56px); line-height: 1.05; letter-spacing: -0.03em; margin: 0; text-wrap: balance; }
.home-hero .lead { font-size: 19px; line-height: 1.55; margin-top: 18px; text-wrap: pretty; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; margin: 0 0 18px; padding: 6px 12px; border-radius: 999px;
  font-size: 13px; font-weight: 600; color: var(--accent);
  background: color-mix(in srgb, var(--accent) 11%, transparent);
}
.eyebrow::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }
.cta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.stats { display: flex; flex-wrap: wrap; gap: 14px 36px; margin: 36px 0 0; }
.stats div { display: flex; flex-direction: column-reverse; }
.stats dt { font-size: 13px; color: var(--muted); }
.stats dd { margin: 0; font-size: 26px; font-weight: 700; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }

.hero-demo {
  display: block; text-decoration: none; color: inherit; padding: 14px; border-radius: 22px;
  background: var(--card); border: 1px solid var(--rule);
  box-shadow: 0 30px 60px -24px rgba(20, 40, 32, 0.28), 0 2px 6px rgba(20, 40, 32, 0.05);
  transition: transform 0.2s ease;
}
.hero-demo:hover { transform: translateY(-3px); }
.hero-demo .board-wrap { border-radius: 12px; }
.hero-demo .sq, .trap-card .sq { cursor: inherit; }
.hero-caption { display: flex; justify-content: space-between; align-items: center; gap: 14px; padding: 14px 6px 4px; }
.hero-caption b { display: block; font-size: 17px; }
.hero-line { display: block; min-height: 3em; font-size: 14px; color: var(--muted); font-variant-numeric: tabular-nums; line-height: 1.5; }
.hero-line .bad { color: var(--bad); font-weight: 700; }
.hero-line .good { color: var(--good); font-weight: 600; }
.hero-rate { text-align: right; flex: none; }
.hero-rate b { font-size: 30px; line-height: 1; color: var(--bad); letter-spacing: -0.02em; }
.hero-rate span { font-size: 13px; color: var(--muted); }

.features { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; margin-top: 56px; padding-top: 32px; border-top: 1px solid var(--rule); }
.features h3 { font-size: 16px; margin: 0 0 6px; }
.features p { margin: 0; color: var(--muted); font-size: 15px; }

.trap-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.trap-card {
  display: grid; grid-template-columns: 116px minmax(0, 1fr); gap: 14px; align-items: center; padding: 12px;
  text-decoration: none; color: inherit; background: var(--card); border: 1px solid var(--rule); border-radius: 16px;
}
.trap-card .board-wrap { border-radius: 8px; }
.trap-card h3 { font-size: 16px; line-height: 1.25; margin: 0 0 6px; }
.trap-card .kicker { font-size: 12.5px; margin: 0 0 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.trap-card .rate { margin: 0; font-size: 13px; color: var(--muted); }
.trap-card .rate b { font-size: 22px; color: var(--bad); letter-spacing: -0.02em; margin-right: 2px; }
.trap-card .bands { display: flex; flex-wrap: wrap; gap: 4px 12px; margin: 6px 0 0; font-size: 12.5px; color: var(--muted); }
.trap-card .bands b { color: var(--ink); }
.card { border-radius: 16px; }

@media (max-width: 920px) {
  .home-hero { grid-template-columns: minmax(0, 1fr); gap: 32px; padding-top: 36px; }
  .hero-demo { max-width: 460px; }
  .trap-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 620px) {
  .features { grid-template-columns: minmax(0, 1fr); gap: 18px; }
  .trap-grid { grid-template-columns: minmax(0, 1fr); }
  .block { margin-top: 44px; }
  .site-nav { order: 3; flex-basis: 100%; }
}
@media (prefers-reduced-motion: reduce) { .btn, .card, .trap-card, .hero-demo { transition: none; } }