:root {
  --bg: #ffffff;
  --bg-soft: #f4f7f5;
  --ink: #14201b;
  --ink-soft: #4a5a53;
  --line: #dde5e1;
  --brand: #2f8f5b;
  --brand-ink: #ffffff;
  --brand-soft: #e6f3ec;
  --radius: 14px;
  --max: 1080px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1613;
    --bg-soft: #16201c;
    --ink: #e8efeb;
    --ink-soft: #a5b5ad;
    --line: #26332d;
    --brand: #4cb27b;
    --brand-ink: #0b120f;
    --brand-soft: #1b2c24;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 17px;
  line-height: 1.6;
}
a { color: var(--brand); }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 16px; }

header.site {
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; background: var(--bg); z-index: 10;
}
header.site .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 20px; color: var(--ink); text-decoration: none; }
.logo-mark { width: 34px; height: 34px; border-radius: 9px; background: var(--brand); color: var(--brand-ink); display: grid; place-items: center; font-weight: 800; }
nav.main { display: flex; gap: 20px; font-size: 15px; }
nav.main a { color: var(--ink-soft); text-decoration: none; }
nav.main a:hover { color: var(--ink); }
@media (max-width: 640px) { nav.main { display: none; } }

.hero { padding: 72px 0 56px; }
.hero h1 { font-size: clamp(32px, 6vw, 52px); line-height: 1.1; margin: 0 0 18px; letter-spacing: -0.02em; }
.hero p.lead { font-size: 20px; color: var(--ink-soft); max-width: 680px; margin: 0 0 28px; }
.btn { display: inline-block; padding: 12px 22px; border-radius: 10px; background: var(--brand); color: var(--brand-ink); text-decoration: none; font-weight: 600; }
.btn.ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); margin-left: 8px; }

section { padding: 56px 0; }
section.soft { background: var(--bg-soft); }
h2 { font-size: 30px; margin: 0 0 8px; letter-spacing: -0.01em; }
.sub { color: var(--ink-soft); margin: 0 0 32px; }

.grid { display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(290px, 1fr)); }
.card { background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; }
.card h3 { margin: 0 0 4px; font-size: 22px; }
.tag { display: inline-block; font-size: 13px; font-weight: 600; color: var(--brand); background: var(--brand-soft); padding: 2px 10px; border-radius: 999px; margin-bottom: 12px; }
.card ul { padding-left: 20px; margin: 12px 0 0; color: var(--ink-soft); }
.card li { margin: 4px 0; }

.steps { counter-reset: s; list-style: none; padding: 0; margin: 0; display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.steps li { counter-increment: s; background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.steps li::before { content: counter(s); display: grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; background: var(--brand); color: var(--brand-ink); font-weight: 700; margin-bottom: 10px; }

.facts { display: grid; gap: 12px 32px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.facts div { border-top: 1px solid var(--line); padding-top: 12px; }
.facts b { display: block; font-size: 14px; color: var(--ink-soft); font-weight: 600; }

footer.site { border-top: 1px solid var(--line); padding: 32px 0; font-size: 14px; color: var(--ink-soft); }
footer.site .wrap { display: flex; flex-wrap: wrap; gap: 12px 28px; justify-content: space-between; }
footer.site a { color: var(--ink-soft); }

.doc { padding: 48px 0 72px; max-width: 780px; }
.doc h1 { font-size: 36px; line-height: 1.15; margin: 0 0 6px; }
.doc .updated { color: var(--ink-soft); margin: 0 0 32px; font-size: 15px; }
.doc h2 { font-size: 22px; margin: 36px 0 8px; }
.doc p, .doc li { color: var(--ink); }
.doc ul, .doc ol { padding-left: 22px; }