:root {
  color-scheme: light dark;
  --bg: #f7f7f5;
  --surface: rgba(255, 255, 255, 0.76);
  --text: #121212;
  --muted: #686866;
  --line: rgba(18, 18, 18, 0.13);
  --accent: #121212;
  --accent-text: #fff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #090909;
    --surface: rgba(24, 24, 24, 0.82);
    --text: #f3f3f0;
    --muted: #a5a5a0;
    --line: rgba(255, 255, 255, 0.14);
    --accent: #f3f3f0;
    --accent-text: #090909;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 20% 8%, rgba(127, 127, 127, 0.12), transparent 26rem),
    radial-gradient(circle at 85% 55%, rgba(127, 127, 127, 0.09), transparent 30rem),
    var(--bg);
  color: var(--text);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.7;
}

a { color: inherit; }
.shell { width: min(820px, calc(100% - 40px)); margin: 0 auto; padding: 32px 0 64px; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 68px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; font-weight: 750; letter-spacing: -0.02em; }
.mark { width: 34px; height: 34px; border: 1px solid var(--line); border-radius: 50%; display: grid; place-items: center; }
.mark::after { content: ""; width: 12px; height: 12px; border: 3px solid var(--text); border-radius: 50%; border-right-color: transparent; }
.nav { display: flex; gap: 18px; font-size: 13px; color: var(--muted); }
.nav a { text-decoration: none; }
.nav a:hover { color: var(--text); }
.eyebrow { margin: 0 0 12px; color: var(--muted); font-size: 12px; font-weight: 700; letter-spacing: 0.16em; text-transform: uppercase; }
h1 { margin: 0; max-width: 720px; font-size: clamp(38px, 7vw, 68px); line-height: 1.03; letter-spacing: -0.055em; }
.lede { max-width: 650px; margin: 24px 0 0; color: var(--muted); font-size: clamp(17px, 2.5vw, 20px); line-height: 1.65; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 30px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 0 18px; border: 1px solid var(--line); border-radius: 14px; text-decoration: none; font-size: 14px; font-weight: 650; }
.button.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin-top: 56px; }
.card { padding: 26px; border: 1px solid var(--line); border-radius: 22px; background: var(--surface); backdrop-filter: blur(16px); }
.card h2, .card h3 { margin: 0 0 9px; letter-spacing: -0.025em; line-height: 1.3; }
.card p { margin: 0; color: var(--muted); }
.card-link { text-decoration: none; transition: transform 160ms ease, border-color 160ms ease; }
.card-link:hover { transform: translateY(-2px); border-color: var(--text); }
.content { margin-top: 52px; }
.section { padding: 30px 0; border-top: 1px solid var(--line); }
.section h2 { margin: 0 0 14px; font-size: 25px; letter-spacing: -0.035em; }
.section h3 { margin: 24px 0 8px; font-size: 16px; }
.section p, .section li { color: var(--muted); }
.section ul { margin: 10px 0 0; padding-left: 22px; }
.section strong { color: var(--text); }
.language-note { margin: 38px 0 0; padding: 14px 16px; border: 1px solid var(--line); border-radius: 14px; color: var(--muted); font-size: 13px; }
.updated { color: var(--muted); font-size: 13px; margin-top: 16px; }
.payment-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin-top: 42px; }
.payment-card { padding: 22px; border: 1px solid var(--line); border-radius: 22px; background: var(--surface); text-align: center; }
.payment-card h2 { margin: 14px 0 4px; font-size: 20px; letter-spacing: -0.03em; }
.payment-card p { margin: 0; color: var(--muted); font-size: 13px; }
.qr-frame { background: #fff; border-radius: 16px; overflow: hidden; aspect-ratio: 1 / 1; display: grid; place-items: center; }
.qr-frame img { display: block; width: 100%; height: 100%; object-fit: contain; }
.payment-card .button { width: 100%; margin-top: 14px; }
.notice { margin-top: 14px; padding: 20px; border: 1px solid var(--line); border-radius: 18px; background: var(--surface); }
.notice p { margin: 0; color: var(--muted); font-size: 13px; }
footer { margin-top: 54px; padding-top: 24px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; display: flex; justify-content: space-between; gap: 18px; }

@media (max-width: 620px) {
  .shell { width: min(100% - 28px, 820px); padding-top: 20px; }
  .topbar { align-items: flex-start; margin-bottom: 48px; }
  .nav { flex-direction: column; align-items: flex-end; gap: 4px; }
  .grid { grid-template-columns: 1fr; margin-top: 40px; }
  .payment-grid { grid-template-columns: 1fr; }
  .card { padding: 22px; }
  footer { flex-direction: column; gap: 4px; }
}