:root {
  --bg: #fafaf8;
  --surface: #ffffff;
  --text: #1c1d21;
  --muted: #5d6068;
  --line: #e4e4e0;
  --accent: #3b4fd8;
  --accent-soft: #eef0fd;
  --notice-bg: #fff7e6;
  --notice-line: #f0d9a8;
  --notice-text: #6b4a0e;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111215;
    --surface: #181a1f;
    --text: #ececef;
    --muted: #a0a3ad;
    --line: #2a2d34;
    --accent: #8d9bff;
    --accent-soft: #1e2240;
    --notice-bg: #2a2212;
    --notice-line: #4a3b1c;
    --notice-text: #f0d49a;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }

.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }

header.site {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}
header.site .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; flex-wrap: wrap; min-height: 60px; padding-top: 8px; padding-bottom: 8px;
}
.brand { font-weight: 700; font-size: 18px; color: var(--text); text-decoration: none; letter-spacing: -0.01em; }
.brand span { color: var(--accent); }
nav.top { display: flex; gap: 16px; flex-wrap: wrap; font-size: 14px; }
nav.top a { color: var(--muted); text-decoration: none; }
nav.top a:hover, nav.top a[aria-current="page"] { color: var(--text); }

.notice {
  margin: 24px 0 0;
  padding: 12px 16px;
  border: 1px solid var(--notice-line);
  background: var(--notice-bg);
  color: var(--notice-text);
  border-radius: 8px;
  font-size: 14px;
}

.hero { padding: 56px 0 24px; }
.eyebrow { font-size: 13px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent); margin: 0 0 12px; }
.hero h1 { font-size: clamp(30px, 6vw, 44px); line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 18px; }
.hero p.lead { font-size: 18px; color: var(--muted); margin: 0; max-width: 620px; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; margin: 36px 0; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 18px; }
.card h3 { margin: 0 0 6px; font-size: 16px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }

section.block { margin: 40px 0; }
section.block h2 { font-size: 20px; margin: 0 0 10px; }
section.block p { color: var(--muted); margin: 0 0 10px; }

main.doc { padding: 40px 0 24px; }
main.doc h1 { font-size: clamp(28px, 5vw, 36px); letter-spacing: -0.02em; margin: 0 0 6px; }
main.doc .updated { color: var(--muted); font-size: 14px; margin: 0 0 28px; }
main.doc h2 { font-size: 19px; margin: 34px 0 8px; }
main.doc p, main.doc li { color: var(--text); }
main.doc ul { padding-left: 22px; }
main.doc li { margin: 4px 0; }

dl.facts { display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; margin: 12px 0; }
dl.facts dt { color: var(--muted); }
dl.facts dd { margin: 0; }
@media (max-width: 480px) {
  dl.facts { grid-template-columns: 1fr; gap: 0; }
  dl.facts dd { margin-bottom: 8px; }
}

main.pay { padding: 40px 0 8px; }
.pay-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px;
  padding: 36px 24px; text-align: center;
}
.pay-card h1 { font-size: 24px; letter-spacing: -0.01em; margin: 16px 0 8px; }
.pay-card p { color: var(--muted); margin: 0 auto; max-width: 460px; }
.pay-actions { margin-top: 20px !important; }
.spinner {
  width: 36px; height: 36px; margin: 0 auto; border-radius: 50%;
  border: 3px solid var(--accent-soft); border-top-color: var(--accent);
  animation: spin 0.9s linear infinite;
}
.pay-card:not([data-state="loading"]) .spinner { animation: none; border-color: var(--accent-soft); }
.pay-card[data-state="done"] .spinner { border-color: var(--accent); }
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .spinner { animation-duration: 2.5s; } }
.btn {
  font: inherit; font-weight: 600; cursor: pointer;
  background: var(--accent); color: #fff; border: 0; border-radius: 8px; padding: 10px 20px;
}
@media (prefers-color-scheme: dark) { .btn { color: #111215; } }
.btn:focus-visible { outline: 3px solid var(--accent-soft); outline-offset: 2px; }
.pay-note { font-size: 14px; color: var(--muted); margin: 20px 0 0; }

footer.site {
  margin-top: 56px;
  border-top: 1px solid var(--line);
  background: var(--surface);
  font-size: 14px;
  color: var(--muted);
}
footer.site .wrap { padding-top: 24px; padding-bottom: 32px; }
footer.site nav { display: flex; gap: 18px; flex-wrap: wrap; margin-bottom: 12px; }
footer.site p { margin: 4px 0; }