:root {
  --bg: #f6f7f8; --panel: #fff; --text: #16202a; --muted: #5b6875; --line: #dde2e7;
  --accent: #0f766e; --accent-soft: #e3f1ef; --on-accent: #fff; --code: #0f1720; --code-text: #d7e1e8;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0e1418; --panel: #151d23; --text: #e6edf2; --muted: #9aa8b4; --line: #26323b;
          --accent: #2dd4bf; --accent-soft: #123330; --on-accent: #06201d; --code: #0a0f13; color-scheme: dark; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--accent); }
.wrap { max-width: 960px; margin: 0 auto; padding: 0 20px; }
header.top { display: flex; align-items: center; gap: 10px; padding: 18px 0; }
header.top img { width: 30px; height: 30px; border-radius: 7px; }
header.top b { font-size: 19px; }
header.top nav { margin-left: auto; display: flex; gap: 18px; font-size: 15px; }
header.top nav a { color: var(--muted); text-decoration: none; }
header.top nav a:hover { color: var(--text); }
h1 { font-size: clamp(30px, 5vw, 44px); line-height: 1.15; margin: 28px 0 12px; letter-spacing: -.02em; }
h2 { font-size: 24px; margin: 0 0 12px; letter-spacing: -.01em; }
.lead { font-size: 19px; color: var(--muted); max-width: 640px; margin: 0 0 22px; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 11px 18px; border-radius: 10px; font-weight: 600; text-decoration: none;
       border: 1px solid var(--line); background: var(--panel); color: var(--text); cursor: pointer; font-size: 15px; font-family: inherit; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.btn:hover { filter: brightness(1.05); }
.row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.small { font-size: 14px; color: var(--muted); }
section { padding: 36px 0; border-top: 1px solid var(--line); }
.demo { width: 100%; border-radius: 12px; border: 1px solid var(--line); margin: 30px 0 10px; display: block; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; }
.card b { display: block; margin-bottom: 4px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
pre, code { font-family: ui-monospace, "Cascadia Code", Consolas, monospace; font-size: 13.5px; }
pre { background: var(--code); color: var(--code-text); padding: 12px 14px; border-radius: 10px; overflow-x: auto; margin: 8px 0; white-space: pre-wrap; word-break: break-all; }
.copy { position: relative; }
.copy pre { padding-right: 64px; }
.copy button { position: absolute; top: 6px; right: 6px; font: 600 12px system-ui, sans-serif; padding: 4px 9px; border-radius: 7px; border: 0; background: #2a3640; color: #e6edf2; cursor: pointer; }
input[type=text] { font: inherit; padding: 10px 12px; border-radius: 10px; border: 1px solid var(--line); background: var(--panel); color: var(--text); width: 100%; max-width: 420px; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 22px; }
.center { text-align: center; }
footer { padding: 30px 0 40px; color: var(--muted); font-size: 14px; border-top: 1px solid var(--line); }
.hide { display: none !important; }