:root {
  --bg: #ffffff;
  --fg: #1d2330;
  --muted: #5b6475;
  --border: #e3e6ec;
  --surface: #f5f7fa;
  --accent: #1f6feb;
  --accent-fg: #ffffff;
  --warn-bg: #fff6e5;
  --warn-border: #f0c36d;
  --code-bg: #eef1f5;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f131a;
    --fg: #e6e9ef;
    --muted: #9aa3b2;
    --border: #262d3a;
    --surface: #161b24;
    --accent: #4c8dff;
    --accent-fg: #0b0e13;
    --warn-bg: #2a2212;
    --warn-border: #7a5d1f;
    --code-bg: #1c2230;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
}

a { color: var(--accent); }

.wrap { max-width: 980px; margin: 0 auto; padding: 0 20px; }

.top { border-bottom: 1px solid var(--border); position: sticky; top: 0; background: var(--bg); z-index: 1; }
.nav { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.15rem; color: var(--fg); text-decoration: none; }
nav { display: flex; gap: 18px; flex-wrap: wrap; }
nav a { color: var(--muted); text-decoration: none; font-size: 0.95rem; }
nav a:hover { color: var(--fg); }

section { padding: 56px 0; border-bottom: 1px solid var(--border); }

h1 { font-size: clamp(2rem, 5vw, 3rem); line-height: 1.15; margin: 0 0 16px; }
h2 { font-size: 1.7rem; margin: 0 0 20px; }
h3 { font-size: 1.1rem; margin: 0 0 6px; }

.hero { padding: 72px 0 56px; }
.lead { font-size: 1.2rem; color: var(--muted); max-width: 46em; }
.cta { display: flex; gap: 12px; flex-wrap: wrap; margin: 28px 0 8px; }
.small { font-size: 0.9rem; color: var(--muted); }

.button {
  display: inline-block; padding: 12px 20px; border-radius: 8px; border: 1px solid var(--border);
  text-decoration: none; color: var(--fg); font-weight: 600; background: var(--surface);
}
.button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); }
.button:hover { filter: brightness(1.05); }

.warning { background: var(--warn-bg); }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 16px; padding: 0; margin: 0; list-style: none; counter-reset: c; }
.cards li { background: var(--bg); border: 1px solid var(--warn-border); border-radius: 10px; padding: 16px; counter-increment: c; }
.cards li::before { content: counter(c); display: inline-block; font-weight: 700; color: var(--warn-border); margin-right: 6px; }

table { width: 100%; border-collapse: collapse; margin-bottom: 12px; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; font-size: 0.9rem; }

code { font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace; font-size: 0.92em; background: var(--code-bg); padding: 1px 5px; border-radius: 4px; }
pre { background: var(--code-bg); padding: 12px 16px; border-radius: 8px; overflow-x: auto; margin: 8px 0; }
pre code { background: none; padding: 0; }

.steps { padding-left: 1.4em; }
.steps li { margin-bottom: 22px; }
.steps li::marker { font-weight: 700; color: var(--accent); }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); gap: 18px; }
.feature { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 18px; }
.feature p { margin: 0; color: var(--muted); }

details { border: 1px solid var(--border); border-radius: 8px; padding: 12px 16px; margin-bottom: 10px; background: var(--surface); }
summary { cursor: pointer; font-weight: 600; }
details p { margin: 10px 0 0; color: var(--muted); }

.disclaimer { background: var(--surface); }
.disclaimer p { max-width: 52em; }

footer { padding: 28px 0 40px; color: var(--muted); font-size: 0.9rem; }
footer a { color: var(--muted); }

@media (max-width: 640px) {
  nav a:not(:last-child):not(:first-child) { display: none; }
  section { padding: 40px 0; }
}