:root {
  color-scheme: dark;
  --bg: #0b0d10; --surface: #151a20; --line: #232b35; --fg: #e8edf2; --muted: #93a1b1; --amber: #ffb020;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--fg); }
body { font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--amber); }
main { max-width: 820px; margin: 0 auto; padding: 24px 16px 64px; }
header.top { display: flex; align-items: center; gap: 12px; padding: 16px; max-width: 820px; margin: 0 auto; }
header.top img { width: 44px; height: 44px; }
header.top a { color: var(--fg); text-decoration: none; font-weight: 700; letter-spacing: .02em; }
h1 { font-size: clamp(28px, 6vw, 44px); line-height: 1.15; margin: 16px 0 8px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
p.lead { color: var(--muted); font-size: 18px; margin: 0 0 24px; }
.muted { color: var(--muted); }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; margin: 24px 0; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 18px; }
.card b { display: block; margin-bottom: 4px; }
.buttons { display: flex; flex-wrap: wrap; gap: 12px; margin: 24px 0; }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 52px; padding: 0 22px; border-radius: 14px;
  font-weight: 700; text-decoration: none; border: 1px solid var(--line); color: var(--fg); background: var(--surface); }
.btn.primary { background: var(--amber); border-color: var(--amber); color: #111; }
.btn.disabled { opacity: .5; pointer-events: none; }
.freq { font: 700 clamp(48px, 14vw, 88px)/1 ui-monospace, "Cascadia Mono", Menlo, monospace; color: var(--amber); letter-spacing: .04em; margin: 16px 0; }
.legal h2 { font-size: 18px; }
.legal li { margin: 4px 0; }
footer { max-width: 820px; margin: 0 auto; padding: 24px 16px 40px; color: var(--muted); font-size: 14px; border-top: 1px solid var(--line); }
footer a { color: var(--muted); margin-right: 16px; }