:root {
  --bg: #f4f1ea;
  --bg-2: #ebe6db;
  --card: #fffdf8;
  --ink: #1d1a16;
  --ink-2: #5b554b;
  --ink-3: #8c857a;
  --line: #ddd6c8;
  --accent: #c2410c;
  --accent-ink: #ffffff;
  --accent-soft: #fbe3d4;
  --ok: #15803d;
  --err: #b42318;
  --err-soft: #fde4e1;
  --shadow: 0 1px 2px rgba(29, 26, 22, .05), 0 12px 32px -12px rgba(29, 26, 22, .18);
  --radius: 18px;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14120f;
    --bg-2: #1b1814;
    --card: #1f1c18;
    --ink: #f3eee6;
    --ink-2: #b9b1a4;
    --ink-3: #847c70;
    --line: #2f2a24;
    --accent: #f97316;
    --accent-ink: #1a0d03;
    --accent-soft: #3a2010;
    --ok: #4ade80;
    --err: #f87171;
    --err-soft: #3b1714;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 16px 40px -16px rgba(0, 0, 0, .6);
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font: 16px/1.55 var(--sans);
  color: var(--ink);
  background: var(--bg);
  background-image:
    radial-gradient(1200px 600px at 85% -10%, var(--accent-soft), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, var(--bg-2), transparent 60%);
  background-attachment: fixed;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: inherit; }
.wrap { width: 100%; max-width: 1080px; margin: 0 auto; padding-left: 24px; padding-right: 24px; }

/* шапка */
header.top { padding: 22px 0; }
header.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 700; font-size: 19px; letter-spacing: -.01em; }
.brand svg { width: 34px; height: 34px; flex: none; }
.brand small { display: block; font-weight: 500; font-size: 12px; color: var(--ink-3); letter-spacing: 0; margin-top: -2px; }
nav.menu { display: flex; gap: 4px; flex-wrap: wrap; }
nav.menu a { text-decoration: none; color: var(--ink-2); font-size: 15px; padding: 8px 12px; border-radius: 10px; }
nav.menu a:hover, nav.menu a[aria-current] { color: var(--ink); background: var(--card); }

/* главный блок */
main { flex: 1; }
.hero { display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; padding-top: 36px; padding-bottom: 64px; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600; color: var(--accent); background: var(--accent-soft); padding: 6px 12px; border-radius: 999px; }
.eyebrow i { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); display: inline-block; }
h1 { font-size: clamp(34px, 5vw, 54px); line-height: 1.05; letter-spacing: -.035em; margin: 18px 0 16px; }
h1 em { font-style: normal; color: var(--accent); }
.lead { font-size: 18px; color: var(--ink-2); max-width: 30em; margin: 0 0 28px; }
.facts { display: flex; gap: 22px; flex-wrap: wrap; color: var(--ink-2); font-size: 14px; }
.facts span { display: inline-flex; align-items: center; gap: 8px; }
.facts svg { width: 18px; height: 18px; color: var(--accent); }

/* карточка с кодом */
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 28px; }
.tabs { display: grid; grid-template-columns: 1fr 1fr; background: var(--bg-2); border-radius: 12px; padding: 4px; margin-bottom: 22px; }
.tabs button { font: inherit; font-size: 15px; font-weight: 600; border: 0; background: transparent; color: var(--ink-2); padding: 10px; border-radius: 9px; cursor: pointer; }
.tabs button[aria-selected="true"] { background: var(--card); color: var(--ink); box-shadow: 0 1px 3px rgba(0,0,0,.08); }
.pane[hidden] { display: none; }
label.l { display: block; font-size: 14px; font-weight: 600; margin-bottom: 10px; }
.code {
  display: flex; gap: 8px; justify-content: space-between;
}
.code input {
  width: 100%; min-width: 0; text-align: center; font: 600 24px/1 var(--mono); text-transform: uppercase;
  color: var(--ink); background: var(--bg); border: 1.5px solid var(--line); border-radius: 12px; padding: 14px 0;
  outline: none; transition: border-color .15s, box-shadow .15s;
}
.code input:focus { border-color: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft); }
.code .dash { align-self: center; color: var(--ink-3); font: 600 22px var(--mono); }
.hint { font-size: 13px; color: var(--ink-3); margin: 10px 0 18px; }
.btn {
  width: 100%; font: inherit; font-weight: 700; font-size: 16px; border: 0; cursor: pointer;
  background: var(--accent); color: var(--accent-ink); padding: 14px 18px; border-radius: 12px;
  display: inline-flex; align-items: center; justify-content: center; gap: 10px; transition: transform .1s, filter .15s;
}
.btn:hover { filter: brightness(1.05); }
.btn:active { transform: translateY(1px); }
.btn[disabled] { opacity: .65; cursor: progress; }
.btn.ghost { background: transparent; color: var(--ink); border: 1.5px solid var(--line); }
.spin { width: 16px; height: 16px; border: 2px solid currentColor; border-right-color: transparent; border-radius: 50%; animation: s .7s linear infinite; }
@keyframes s { to { transform: rotate(360deg); } }
.msg { display: none; margin-top: 16px; padding: 12px 14px; border-radius: 12px; font-size: 14px; background: var(--err-soft); color: var(--err); }
.msg.show { display: flex; gap: 10px; align-items: flex-start; }
.msg svg { width: 18px; height: 18px; flex: none; margin-top: 1px; }
.drop {
  border: 1.5px dashed var(--line); border-radius: 14px; padding: 28px 18px; text-align: center; color: var(--ink-2);
  background: var(--bg); margin-bottom: 16px; cursor: pointer; transition: border-color .15s, background .15s;
}
.drop:hover, .drop.over { border-color: var(--accent); background: var(--accent-soft); }
.drop svg { width: 34px; height: 34px; color: var(--accent); }
.drop b { display: block; color: var(--ink); margin: 8px 0 2px; }
.drop small { color: var(--ink-3); }
.row { display: flex; gap: 10px; }
.row select { flex: 1; font: inherit; font-size: 14px; color: var(--ink); background: var(--bg); border: 1.5px solid var(--line); border-radius: 12px; padding: 10px; }

/* как это работает */
section.block { padding: 56px 0; border-top: 1px solid var(--line); }
section.block h2 { font-size: 30px; letter-spacing: -.02em; margin: 0 0 8px; }
section.block > .wrap > p { color: var(--ink-2); margin: 0 0 32px; max-width: 38em; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; counter-reset: st; }
.step { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.step::before { counter-increment: st; content: counter(st); display: inline-grid; place-items: center; width: 32px; height: 32px; border-radius: 10px; background: var(--accent-soft); color: var(--accent); font-weight: 700; margin-bottom: 14px; }
.step h3 { margin: 0 0 6px; font-size: 17px; }
.step p { margin: 0; color: var(--ink-2); font-size: 15px; }
.grid4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.feat h3 { font-size: 16px; margin: 10px 0 4px; }
.feat p { margin: 0; color: var(--ink-2); font-size: 14px; }
.feat svg { width: 26px; height: 26px; color: var(--accent); }

/* текстовые страницы */
.doc { max-width: 800px; padding-top: 24px; padding-bottom: 72px; }
.doc h1 { font-size: clamp(30px, 4vw, 42px); }
.doc h2 { font-size: 21px; margin: 34px 0 8px; letter-spacing: -.01em; }
.doc p, .doc li { color: var(--ink-2); }
.doc .upd { color: var(--ink-3); font-size: 14px; }
details { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px; margin-bottom: 10px; }
summary { cursor: pointer; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; color: var(--accent); font-weight: 700; }
details[open] summary::after { content: "–"; }
details p { margin: 10px 0 0; }

/* подвал */
footer.bottom { border-top: 1px solid var(--line); padding: 26px 0; color: var(--ink-3); font-size: 14px; }
footer.bottom .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
footer.bottom nav { display: flex; gap: 18px; flex-wrap: wrap; }
footer.bottom a { text-decoration: none; }
footer.bottom a:hover { color: var(--ink); }
.status { display: inline-flex; align-items: center; gap: 8px; }
.status i { width: 8px; height: 8px; border-radius: 50%; background: var(--ok); box-shadow: 0 0 0 3px color-mix(in srgb, var(--ok) 25%, transparent); }

@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; gap: 36px; padding-top: 12px; padding-bottom: 48px; }
  .steps { grid-template-columns: 1fr; }
  .grid4 { grid-template-columns: 1fr 1fr; gap: 26px 20px; }
  section.block { padding: 44px 0; }
}
@media (max-width: 600px) {
  .wrap { padding-left: 20px; padding-right: 20px; }
  header.top { padding: 16px 0 8px; }
  header.top .wrap { flex-direction: column; align-items: stretch; gap: 12px; }
  nav.menu { flex-wrap: nowrap; overflow-x: auto; gap: 6px; margin: 0 -20px; padding: 0 20px 4px; scrollbar-width: none; }
  nav.menu::-webkit-scrollbar { display: none; }
  nav.menu a { flex: none; font-size: 14px; padding: 7px 12px; background: var(--card); border: 1px solid var(--line); border-radius: 999px; }
  nav.menu a[aria-current] { border-color: var(--accent); color: var(--accent); }
  h1 { font-size: 32px; line-height: 1.1; margin: 14px 0 12px; }
  .lead { font-size: 16px; margin-bottom: 20px; }
  .facts { gap: 10px 18px; font-size: 13px; }
  .card { padding: 20px; border-radius: 16px; }
  .code { gap: 6px; }
  .code input { font-size: 20px; padding: 13px 0; letter-spacing: .08em; }
  .grid4 { grid-template-columns: 1fr; }
  section.block h2 { font-size: 24px; }
  .step { padding: 18px; }
  .doc h1 { font-size: 28px; }
  details { padding: 14px 16px; }
  footer.bottom .wrap { flex-direction: column; gap: 12px; }
}