:root {
  --bg: #0f0f0e; --card: #1b1b19; --line: #2c2c29; --text: #f4f4f1; --muted: #a8a8a1;
  --accent: #eeff41; --on-accent: #111;
}
@media (prefers-color-scheme: light) {
  :root { --bg: #f7f7f4; --card: #ffffff; --line: #e1e1da; --text: #151513; --muted: #62625b; --accent: #d7ec16; --on-accent: #111; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.6 "M PLUS Rounded 1c", -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
a { color: inherit; text-decoration-color: var(--accent); text-underline-offset: 3px; }
.wrap { max-width: 980px; margin: 0 auto; padding: 0 20px; }
header.top { display: flex; align-items: center; justify-content: space-between; padding: 22px 0; }
header.top .brand { display: flex; align-items: center; gap: 12px; font-weight: 700; font-size: 20px; text-decoration: none; }
header.top img { width: 36px; height: 36px; border-radius: 9px; }
nav a { margin-left: 20px; color: var(--muted); text-decoration: none; font-size: 15px; }
nav a:hover { color: var(--text); }
.hero { text-align: center; padding: 56px 0 40px; }
.hero img.logo { width: 112px; height: 112px; border-radius: 26px; box-shadow: 0 18px 50px rgba(0,0,0,.35); }
h1, h2, h3, header.top .brand { font-weight: 800; }
h1 { font-size: clamp(34px, 6vw, 56px); line-height: 1.08; margin: 28px 0 14px; letter-spacing: -0.02em; }
.hero p.lead { font-size: clamp(18px, 2.4vw, 22px); color: var(--muted); max-width: 640px; margin: 0 auto 28px; }
.btn { display: inline-block; background: var(--accent); color: var(--on-accent); font-weight: 800; padding: 14px 26px; border-radius: 12px; text-decoration: none; }
.btn.off { opacity: .55; cursor: default; }
.note { color: var(--muted); font-size: 14px; margin-top: 12px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; margin: 24px 0 8px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 22px; }
.card h3 { margin: 0 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 16px; }
.dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; background: var(--accent); margin-right: 8px; }
section { padding: 32px 0; }
h2 { font-size: 28px; margin: 0 0 8px; letter-spacing: -0.01em; }
.doc { padding: 24px 0 60px; max-width: 760px; }
.doc h1 { font-size: 38px; margin: 12px 0 8px; }
.doc h2 { font-size: 22px; margin-top: 34px; }
.doc p, .doc li { color: var(--text); }
.doc .muted { color: var(--muted); }
footer { border-top: 1px solid var(--line); margin-top: 40px; padding: 28px 0 50px; color: var(--muted); font-size: 14px; }
footer a { margin-right: 18px; }