:root {
  --bg: #f2f5f4; --card: #fff; --text: #0e1a16; --muted: #5e6e69; --line: #dfe7e4;
  --primary: #0f9d7a; --primary-dark: #0a7259; --soft: #daf2ea;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0a0f0e; --card: #141c1a; --text: #eaf2ef; --muted: #93a39e; --line: #25312e; --primary: #2ed3a5; --primary-dark: #5fe3be; --soft: #123128; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
main { max-width: 760px; margin: 0 auto; padding: 24px 16px 64px; }
header.top { display: flex; align-items: center; gap: 10px; padding: 8px 0 24px; }
header.top a { color: var(--text); text-decoration: none; font-weight: 800; font-size: 20px; display: flex; align-items: center; gap: 10px; }
.logo { width: 36px; height: 36px; border-radius: 10px; background: linear-gradient(135deg, #17b98f, #0a7f62); display: grid; place-items: center; color: #fff; font-size: 20px; }
h1 { font-size: 34px; line-height: 1.15; letter-spacing: -0.8px; margin: 0 0 12px; }
h2 { font-size: 21px; margin: 32px 0 8px; letter-spacing: -0.3px; }
h3 { font-size: 17px; margin: 20px 0 4px; }
p, li { color: var(--text); }
.muted { color: var(--muted); }
a { color: var(--primary-dark); }
.hero { background: linear-gradient(135deg, #17b98f, #0a7f62); color: #fff; border-radius: 28px; padding: 32px 24px; margin-bottom: 20px; }
.hero h1, .hero p { color: #fff; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 18px 20px; margin: 14px 0; }
.code { font-size: 44px; font-weight: 900; letter-spacing: 8px; text-align: center; color: var(--primary-dark); background: var(--soft); border-radius: 18px; padding: 14px; margin: 10px 0; }
.btn { display: block; text-align: center; background: var(--primary); color: #fff; font-weight: 700; text-decoration: none; border-radius: 16px; padding: 15px 18px; margin: 10px 0; }
.btn.secondary { background: var(--soft); color: var(--primary-dark); }
.btn[aria-disabled="true"] { opacity: .5; pointer-events: none; }
.grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }
.feature b { display: block; margin-bottom: 2px; }
footer { margin-top: 48px; border-top: 1px solid var(--line); padding-top: 16px; font-size: 14px; color: var(--muted); display: flex; flex-wrap: wrap; gap: 16px; }
footer a { color: var(--muted); }
.legal p, .legal li { font-size: 16px; }