/* HDGR — hdgr.online. Theme tối + vàng kim theo logo. */
:root {
  --bg: #0e0f13;
  --bg-2: #14161d;
  --card: #181b24;
  --line: #262a36;
  --ink: #ecebe6;
  --ink-2: #b8b6bd;
  --ink-3: #8d8b94;
  --gold: #d8b04a;
  --gold-2: #f0d488;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif;
  line-height: 1.65;
  font-size: 16px;
}
.wrap { max-width: 1060px; margin: 0 auto; padding: 0 16px; }
a { color: var(--gold-2); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header */
header.site {
  position: sticky; top: 0; z-index: 50;
  background: rgba(14, 15, 19, 0.92); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
header.site .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 700; letter-spacing: 1px; }
.brand img { height: 40px; width: auto; }
nav.main { display: flex; gap: 18px; font-size: 14px; }
nav.main a { color: var(--ink-2); }
nav.main a:hover { color: var(--gold-2); text-decoration: none; }
.btn {
  display: inline-block; padding: 12px 22px; border-radius: 10px; font-weight: 600;
  background: linear-gradient(135deg, var(--gold), #b8912f); color: #17120a;
}
.btn:hover { filter: brightness(1.08); text-decoration: none; }
.btn.ghost { background: none; border: 1px solid var(--line); color: var(--ink); }

/* Hero */
.hero { padding: 72px 0 56px; text-align: center; background: radial-gradient(ellipse 70% 60% at 50% -10%, #2a2410 0%, var(--bg) 70%); }
.hero img.logo { height: 110px; width: auto; }
.hero h1 { font-size: clamp(28px, 5vw, 44px); line-height: 1.2; margin: 18px 0 12px; }
.hero h1 em { color: var(--gold-2); font-style: normal; }
.hero p.sub { max-width: 640px; margin: 0 auto 26px; color: var(--ink-2); font-size: 17px; }
.hero .cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* Sections */
section.block { padding: 56px 0; }
section.block.alt { background: var(--bg-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.block h2 { font-size: 28px; margin-bottom: 8px; }
.block p.desc { color: var(--ink-2); margin-bottom: 28px; max-width: 700px; }
.tag { display: inline-block; font-size: 12px; letter-spacing: 2px; text-transform: uppercase; color: var(--gold); margin-bottom: 10px; }
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 22px;
  display: flex; flex-direction: column; gap: 8px;
}
.card h3 { font-size: 18px; }
.card p { color: var(--ink-2); font-size: 14.5px; flex: 1; }
.card .act { margin-top: 10px; font-size: 14px; font-weight: 600; }
.note {
  border: 1px solid var(--line); border-left: 3px solid var(--gold); border-radius: 10px;
  background: var(--card); padding: 14px 18px; color: var(--ink-2); font-size: 14.5px;
}

/* Trang nội dung (chính sách) */
.doc { max-width: 760px; margin: 0 auto; padding: 48px 16px 64px; }
.doc h1 { font-size: 30px; margin-bottom: 6px; }
.doc p.updated { color: var(--ink-3); font-size: 13px; margin-bottom: 28px; }
.doc h2 { font-size: 20px; margin: 28px 0 8px; color: var(--gold-2); }
.doc p, .doc li { color: var(--ink-2); font-size: 15.5px; margin-bottom: 10px; }
.doc ul { padding-left: 22px; }
.doc strong { color: var(--ink); }

/* Footer */
footer.site { border-top: 1px solid var(--line); padding: 40px 0 32px; background: var(--bg-2); }
footer.site .cols { display: flex; flex-wrap: wrap; gap: 28px; justify-content: space-between; }
footer.site .biz { font-size: 13.5px; color: var(--ink-3); line-height: 1.8; max-width: 560px; }
footer.site .biz strong { color: var(--ink-2); }
footer.site nav { display: flex; flex-direction: column; gap: 6px; font-size: 13.5px; }
footer.site nav a { color: var(--ink-3); }
footer.site nav a:hover { color: var(--gold-2); }
footer.site .copy { margin-top: 26px; padding-top: 16px; border-top: 1px solid var(--line); font-size: 12.5px; color: var(--ink-3); text-align: center; }

@media (max-width: 640px) {
  nav.main { display: none; }
  .hero { padding: 48px 0 40px; }
}