:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --text: #14181f;
  --muted: #5a6372;
  --border: #e3e6eb;
  --accent: #1d4ed8;
  --accent-soft: #e8eefc;
  --warn-bg: #fff7e6;
  --warn-border: #f0c36d;
  --warn-text: #6b4a00;
  --dot: #d97706;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1116;
    --surface: #161a21;
    --text: #e8ebf0;
    --muted: #9aa3b2;
    --border: #262c36;
    --accent: #7aa2ff;
    --accent-soft: #1a2440;
    --warn-bg: #2a2110;
    --warn-border: #6b5220;
    --warn-text: #f3d9a4;
    --dot: #f59e0b;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}
img { max-width: 100%; height: auto; }
.wrap { max-width: 1040px; margin: 0 auto; padding-inline: 20px; }
.top { border-bottom: 1px solid var(--border); background: var(--surface); }
.top-inner { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-block: 14px; flex-wrap: wrap; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.1rem; color: var(--text); text-decoration: none; }
.badge { display: inline-flex; align-items: center; gap: 8px; font-size: .85rem; color: var(--muted); border: 1px solid var(--border); border-radius: 999px; padding: 4px 12px; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--dot); }
.hero { padding-block: clamp(40px, 8vw, 88px) clamp(28px, 5vw, 48px); }
.eyebrow { margin: 0 0 12px; color: var(--accent); font-weight: 600; letter-spacing: .02em; }
h1 { margin: 0 0 18px; font-size: clamp(1.7rem, 4.2vw, 2.6rem); line-height: 1.2; max-width: 28ch; }
.lead { margin: 0 0 24px; font-size: 1.08rem; color: var(--muted); max-width: 68ch; }
.notice { background: var(--warn-bg); border: 1px solid var(--warn-border); color: var(--warn-text); border-radius: 10px; padding: 14px 16px; max-width: 68ch; }
.section { padding-block: 28px; }
h2 { font-size: 1.3rem; margin: 0 0 18px; }
h3 { font-size: 1.05rem; margin: 0 0 6px; }
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.steps li, .card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 18px; }
.steps p, .card p { margin: 0; color: var(--muted); }
.step-k { display: inline-block; font-size: .78rem; font-weight: 600; color: var(--accent); background: var(--accent-soft); border-radius: 6px; padding: 2px 8px; margin-bottom: 8px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.muted { color: var(--muted); }
.small { font-size: .9rem; margin-top: 16px; }
.foot { border-top: 1px solid var(--border); margin-top: 32px; }
.foot-inner { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding-block: 20px; font-size: .9rem; }