/* Trang chủ DMAI. Không phụ thuộc thư viện ngoài, chạy được khi mất mạng. */
:root {
  --navy: #0b3d6b;
  --navy-d: #072a4b;
  --ink: #16202b;
  --muted: #5b6b7c;
  --line: #dde4ea;
  --bg: #f6f8fa;
  --a: #0f7b4f;
  --b: #8a6d1f;
  --radius: 10px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: #fff; color: var(--ink);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
h1, h2, h3 { line-height: 1.25; margin: 0 0 12px; }
a { color: var(--navy); }

/* Thanh trên */
.top { border-top: 3px solid var(--navy); border-bottom: 1px solid var(--line); background: #fff; }
.top-in { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 14px 20px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: inherit; }
.logo { width: 38px; height: 38px; object-fit: contain; }
.brand b { display: block; font-size: 20px; letter-spacing: .04em; color: var(--navy); }
.brand small { display: block; color: var(--muted); font-size: 12.5px; }
.nav { display: flex; gap: 8px; flex-wrap: wrap; }
.nav a {
  text-decoration: none; padding: 8px 14px; border-radius: 8px;
  border: 1px solid var(--line); color: var(--navy); font-size: 14.5px; font-weight: 500;
}
.nav a:hover { background: var(--bg); }
.nav a.ghost { background: var(--navy); color: #fff; border-color: var(--navy); }
.nav a.ghost:hover { background: var(--navy-d); }

/* Khối mở đầu */
.hero { background: linear-gradient(180deg, #fbfcfd, #fff); padding: 56px 0 44px; border-bottom: 1px solid var(--line); }
.hero h1 { font-size: 33px; max-width: 20ch; }
.lead { color: var(--muted); max-width: 62ch; font-size: 17px; margin: 0 0 26px; }

.search { display: flex; gap: 10px; max-width: 640px; flex-wrap: wrap; }
.search input {
  flex: 1 1 320px; padding: 13px 15px; font-size: 15.5px;
  border: 1px solid var(--line); border-radius: var(--radius); background: #fff; color: var(--ink);
}
.search input:focus { outline: 2px solid var(--navy); outline-offset: 1px; border-color: var(--navy); }
.search button {
  padding: 13px 26px; font-size: 15.5px; font-weight: 600; cursor: pointer;
  background: var(--navy); color: #fff; border: 0; border-radius: var(--radius);
}
.search button:hover { background: var(--navy-d); }

.out {
  margin-top: 20px; max-width: 720px; border: 1px solid var(--line);
  border-radius: var(--radius); padding: 18px 20px; background: #fff;
}
.out h3 { font-size: 18px; margin-bottom: 6px; }
.badge {
  display: inline-block; font-size: 12.5px; font-weight: 600; padding: 3px 10px;
  border-radius: 999px; margin-bottom: 10px;
}
.badge.a { background: #e7f5ee; color: var(--a); }
.badge.b { background: #fbf3dd; color: var(--b); }
.badge.x { background: #fdecec; color: #a4161a; }
.kv { margin: 10px 0 0; border-top: 1px solid var(--line); padding-top: 10px; }
.kv div { display: flex; gap: 10px; padding: 3px 0; font-size: 14.5px; }
.kv span:first-child { color: var(--muted); min-width: 150px; }
.rights { margin: 12px 0 0; padding: 0; list-style: none; }
.rights li {
  font-size: 14.5px; padding: 7px 11px; background: var(--bg);
  border-radius: 7px; margin-bottom: 6px;
}
.disc { margin-top: 12px; font-size: 13px; color: var(--muted); border-top: 1px solid var(--line); padding-top: 10px; }

/* Hai tầng dữ liệu */
.tiers, .who { padding: 46px 20px; }
.tiers h2, .who h2 { font-size: 24px; }
.sub { color: var(--muted); margin: 0 0 22px; }
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.card { border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; background: #fff; }
.card h3 { font-size: 17.5px; }
.card p { margin: 0 0 10px; color: #33414f; font-size: 15px; }
.card.a { border-top: 3px solid var(--a); }
.card.b { border-top: 3px solid var(--b); }
.stat { font-size: 14px; color: var(--muted); margin: 0; }
.stat span { font-size: 22px; font-weight: 700; color: var(--ink); font-variant-numeric: tabular-nums; }

.who { border-top: 1px solid var(--line); background: var(--bg); }
.grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.grid .card a { font-size: 14.5px; font-weight: 600; text-decoration: none; }
.grid .card a:hover { text-decoration: underline; }

/* Chân trang */
.foot { border-top: 1px solid var(--line); padding: 26px 0 34px; }
.foot p { margin: 0 0 8px; font-size: 13.5px; color: var(--muted); max-width: 80ch; }
.foot .dim { color: #93a1ae; }

@media (max-width: 900px) {
  .grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .hero { padding: 36px 0 30px; }
  .hero h1 { font-size: 25px; }
  .two, .grid { grid-template-columns: 1fr; }
  .top-in { flex-direction: column; align-items: flex-start; }
}
@media (prefers-color-scheme: dark) {
  :root { --ink: #e8edf2; --muted: #9aa9b8; --line: #26323d; --bg: #131b23; }
  body { background: #0d141a; }
  .top, .card, .out, .search input { background: #121a22; }
  .hero { background: linear-gradient(180deg, #101820, #0d141a); }
  .brand b, .nav a { color: #cfe3f5; }
  .nav a.ghost { background: #1d4d7d; border-color: #1d4d7d; color: #fff; }
  .card p { color: #c3cfda; }
  .search button { background: #1d4d7d; }
}