:root {
  --bg: #F7F6F3;
  --surface: #FFFFFF;
  --surface-alt: #EFEDE8;
  --border: #E4E1DA;
  --text: #1B1A17;
  --text-2: #6B675F;
  --primary: #D63F1E;
  --on-primary: #FFFFFF;
  --danger: #B42318;
  --success: #0E8A6B;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #111113;
    --surface: #1C1C1F;
    --surface-alt: #26262A;
    --border: #2E2E33;
    --text: #F4F3EF;
    --text-2: #A19D95;
    --primary: #FF6B4A;
    --on-primary: #1B0A05;
    --danger: #F97066;
    --success: #2BC59B;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #111113;
  --surface: #1C1C1F;
  --surface-alt: #26262A;
  --border: #2E2E33;
  --text: #F4F3EF;
  --text-2: #A19D95;
  --primary: #FF6B4A;
  --on-primary: #1B0A05;
  --danger: #F97066;
  --success: #2BC59B;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 Rubik, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 0 16px; }
header.top { border-bottom: 1px solid var(--border); background: var(--surface); }
header.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 60px; flex-wrap: wrap; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; font-size: 20px; color: var(--text); text-decoration: none; letter-spacing: -0.01em; }
.brand-dot { width: 30px; height: 30px; border-radius: 9px; background: #D63F1E; display: grid; place-items: center; overflow: hidden; }
.brand-dot svg { width: 30px; height: 30px; }
nav.links { display: flex; gap: 16px; flex-wrap: wrap; font-size: 14px; }
nav.links a { color: var(--text-2); text-decoration: none; }
nav.links a:hover, nav.links a[aria-current="page"] { color: var(--primary); }
main { padding: 32px 0 56px; }
h1 { font-size: clamp(28px, 6vw, 38px); line-height: 1.15; margin: 0 0 8px; letter-spacing: -0.02em; }
h2 { font-size: 21px; margin: 36px 0 10px; line-height: 1.3; }
h3 { font-size: 17px; margin: 24px 0 8px; }
p, li { color: var(--text); }
.meta, .muted { color: var(--text-2); font-size: 14px; }
a { color: var(--primary); }
table { width: 100%; border-collapse: collapse; margin: 12px 0 20px; font-size: 15px; display: block; overflow-x: auto; }
th, td { text-align: left; vertical-align: top; padding: 10px 12px; border-bottom: 1px solid var(--border); }
th { background: var(--surface-alt); font-weight: 600; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 18px; padding: 24px; margin: 20px 0; }
.lang { font-size: 14px; margin-top: 4px; }
footer { border-top: 1px solid var(--border); padding: 24px 0 40px; font-size: 14px; color: var(--text-2); }
footer a { color: var(--text-2); }
label { display: block; font-weight: 600; margin: 0 0 6px; }
input {
  width: 100%; font: inherit; padding: 13px 14px; border-radius: 12px;
  border: 1.5px solid var(--border); background: var(--bg); color: var(--text);
}
input:focus { outline: none; border-color: var(--primary); }
input.code { font-size: 26px; letter-spacing: 10px; text-align: center; font-weight: 700; }
button {
  font: inherit; font-weight: 600; border: 0; border-radius: 12px; min-height: 48px; padding: 0 20px;
  cursor: pointer; background: var(--primary); color: var(--on-primary); width: 100%; margin-top: 14px;
}
button.danger { background: var(--danger); color: #FFFFFF; }
button.link { background: none; color: var(--text-2); min-height: 40px; text-decoration: underline; }
button:disabled { opacity: 0.55; cursor: default; }
.msg { margin-top: 12px; font-size: 15px; min-height: 1.4em; }
.msg.err { color: var(--danger); }
.msg.ok { color: var(--success); }
.steps { padding-left: 20px; }
.steps li { margin: 6px 0; }
.hero { padding: 24px 0 8px; }
.hero p { font-size: 19px; color: var(--text-2); max-width: 560px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 12px; margin-top: 20px; }
.grid .card { margin: 0; padding: 18px; }
.grid .card b { display: block; margin-bottom: 4px; }
[hidden] { display: none !important; }