:root {
  --bg: #0b1020; --s1: #121a2e; --line: #232d47; --text: #e9eef6; --muted: #98a3b8;
  --gold: #f5b942; --gold-ink: #1d1503; --teal: #43d1c1;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); font-family: 'Be Vietnam Pro', system-ui, -apple-system, sans-serif; line-height: 1.6; }
a { color: var(--teal); }
.wrap { max-width: 880px; margin: 0 auto; padding: 0 20px; }
header { display: flex; align-items: center; gap: 12px; padding: 20px 0; }
.logo { width: 40px; height: 40px; border-radius: 11px; background: linear-gradient(135deg, var(--gold), #e0782f); color: var(--gold-ink); display: grid; place-items: center; font-weight: 800; font-size: 15px; flex: none; }
header b { font-size: 16px; }
.lang { margin-left: auto; display: flex; gap: 4px; background: var(--s1); border: 1px solid var(--line); border-radius: 10px; padding: 3px; }
.lang button { background: none; border: 0; color: var(--muted); font: inherit; font-size: 13px; font-weight: 600; padding: 6px 10px; border-radius: 8px; cursor: pointer; }
.lang button.on { background: var(--line); color: var(--text); }
.hero { padding: 48px 0 32px; }
.hero h1 { font-size: clamp(30px, 6vw, 46px); line-height: 1.15; margin: 0 0 14px; letter-spacing: -.5px; }
.hero p { font-size: 18px; color: var(--muted); max-width: 640px; margin: 0; }
.badges { margin-top: 22px; }
.badge { padding: 10px 16px; border-radius: 12px; background: rgba(245,185,66,.12); color: var(--gold); font-weight: 700; font-size: 14px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; padding: 16px 0 40px; }
.card { background: var(--s1); border: 1px solid var(--line); border-radius: 16px; padding: 18px; }
.card h3 { margin: 0 0 6px; font-size: 16px; }
.card p { margin: 0; color: var(--muted); font-size: 14.5px; }
h2 { font-size: 22px; margin: 36px 0 10px; }
.doc h2 { font-size: 18px; margin: 28px 0 6px; }
.doc p, .doc li { color: #c8d0de; font-size: 15px; }
footer { border-top: 1px solid var(--line); margin-top: 40px; padding: 24px 0 40px; color: var(--muted); font-size: 13px; }
footer nav { display: flex; gap: 16px; margin-bottom: 12px; }
[data-l] { display: none; }
html[lang="en"] [data-l="en"], html[lang="vi"] [data-l="vi"] { display: revert; }