:root {
    --bg: #f6f6f7;
    --card: #ffffff;
    --text: #1f2023;
    --muted: #5d5f66;
    --faint: #8b8d93;
    --line: #e6e6e9;
    --brand: #1a6dd6;
    --brand-hover: #1660c2;
    --radius: 16px;
    color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
    :root { --bg: #111214; --card: #1b1c1f; --text: #f2f2f3; --muted: #b9bbc1; --faint: #8b8d93; --line: #2a2b2f; --brand: #3b82e8; --brand-hover: #2f74d8; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.6 Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
a { color: var(--brand); }
a:hover { color: var(--brand-hover); }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 24px; }
header.site { display: flex; align-items: center; justify-content: space-between; padding: 22px 0; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 600; font-size: 18px; letter-spacing: -0.01em; }
.brand img { width: 32px; height: 32px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 11px 20px; border-radius: 10px; font-weight: 600; font-size: 15px; text-decoration: none; line-height: 1; }
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-hover); color: #fff; }
.btn-ghost { color: var(--text); border: 1px solid var(--line); background: var(--card); }
.btn-ghost:hover { color: var(--text); border-color: var(--faint); }
.hero { text-align: center; padding: 72px 0 56px; }
.hero img.mark { width: 72px; height: 72px; }
.hero h1 { font-size: clamp(34px, 6vw, 56px); line-height: 1.08; letter-spacing: -0.03em; margin: 24px auto 16px; max-width: 760px; }
.hero p { font-size: clamp(17px, 2.2vw, 20px); color: var(--muted); max-width: 620px; margin: 0 auto 32px; }
.hero .actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.networks { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin: 40px auto 0; max-width: 720px; padding: 0; list-style: none; }
.networks li { padding: 6px 12px; border: 1px solid var(--line); border-radius: 999px; background: var(--card); font-size: 14px; color: var(--muted); }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; padding: 24px 0 80px; }
.feature { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.feature h2 { font-size: 18px; margin: 0 0 8px; letter-spacing: -0.01em; }
.feature p { margin: 0; color: var(--muted); font-size: 15px; }
.doc { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: clamp(24px, 5vw, 56px); margin: 16px 0 64px; max-width: 820px; margin-left: auto; margin-right: auto; }
.doc h1 { font-size: clamp(28px, 4.5vw, 40px); letter-spacing: -0.02em; line-height: 1.15; margin: 0 0 8px; }
.doc .updated { color: var(--faint); font-size: 14px; margin: 0 0 32px; }
.doc h2 { font-size: 20px; margin: 36px 0 10px; letter-spacing: -0.01em; }
.doc h3 { font-size: 16px; margin: 22px 0 6px; }
.doc p, .doc li { color: var(--muted); }
.doc strong { color: var(--text); }
.doc ul, .doc ol { padding-left: 22px; }
.doc li { margin: 4px 0; }
.doc table { width: 100%; border-collapse: collapse; font-size: 15px; margin: 12px 0; }
.doc th, .doc td { text-align: left; vertical-align: top; padding: 10px 12px; border-bottom: 1px solid var(--line); color: var(--muted); }
.doc th { color: var(--text); font-weight: 600; }
.note { background: var(--bg); border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; }
footer.site { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--faint); font-size: 14px; }
footer.site .row { display: flex; flex-wrap: wrap; gap: 12px 24px; justify-content: space-between; align-items: center; }
footer.site nav { display: flex; flex-wrap: wrap; gap: 8px 20px; }
footer.site a { color: var(--muted); text-decoration: none; }
footer.site a:hover { color: var(--text); text-decoration: underline; }
@media (max-width: 560px) { header.site .btn-ghost { display: none; } }