:root {
  --bg: #ffffff;
  --panel: #f6f7f9;
  --panel-2: #eef0f4;
  --border: #e3e6ec;
  --text: #1a1d23;
  --muted: #5b6470;
  --accent: #6f57ff;
  --accent-soft: #ece8ff;
  --warn-bg: #fff4d6;
  --warn-text: #6b4a00;
  --code-bg: #1a1d23;
  --code-text: #e6e8ec;
  --code-comment: #8d96a3;
  --r: 14px;
  --r-sm: 8px;
  --max-w: 880px;
  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
strong { font-weight: 650; }

.wrap { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }

header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max-w); margin: 0 auto; padding: 12px 24px;
  display: flex; align-items: center; gap: 14px;
}
.nav-logo { font-weight: 700; color: var(--accent); letter-spacing: 0.04em; }
.nav-title { color: var(--muted); font-size: 0.9rem; }
.nav-links { margin-left: auto; display: flex; gap: 16px; }
.nav-links a { color: var(--muted); font-size: 0.85rem; }
.nav-links a:hover { color: var(--text); text-decoration: none; }

main section { padding: 56px 0; border-top: 1px solid var(--border); }
main section:first-child { border-top: none; }

h1 { font-size: clamp(2rem, 5vw, 2.75rem); font-weight: 700; line-height: 1.15; letter-spacing: -0.02em; margin-bottom: 16px; }
h2 { font-size: clamp(1.3rem, 3vw, 1.6rem); font-weight: 650; line-height: 1.25; letter-spacing: -0.01em; margin-bottom: 20px; }
h3 { font-size: 1.05rem; font-weight: 600; line-height: 1.3; margin: 28px 0 10px; }
p { color: var(--text); margin-bottom: 14px; }
p:last-child { margin-bottom: 0; }
.lede { color: var(--muted); font-size: 1.05rem; }

ol, ul { margin: 0 0 16px 22px; }
li { margin-bottom: 8px; }

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 20px 22px;
  margin: 18px 0;
}
.panel.accent { background: var(--accent-soft); border-color: #d6cdff; }
.panel.warn { background: var(--warn-bg); border-color: #f1d68a; color: var(--warn-text); }

.code-wrap { position: relative; margin: 14px 0 20px; }
pre {
  background: var(--code-bg);
  color: var(--code-text);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 16px 18px;
  border-radius: var(--r-sm);
  overflow-x: auto;
  line-height: 1.55;
}
.code-wrap .copy {
  position: absolute; top: 8px; right: 8px;
  background: rgba(255,255,255,0.08);
  color: #e6e8ec;
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: 6px;
  font-size: 0.75rem;
  padding: 4px 10px;
  cursor: pointer;
  font-family: var(--font-mono);
}
.code-wrap .copy:hover { background: rgba(255,255,255,0.16); }
.code-wrap .copy.copied { background: var(--accent); border-color: var(--accent); color: white; }
code:not(pre code) {
  background: var(--panel-2);
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 1px 6px;
  border-radius: 4px;
}

.cmd-group { margin: 28px 0; }
.cmd-group > h3 {
  color: var(--accent);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 32px 0 12px;
}
.cmd {
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 14px 16px;
  margin-bottom: 10px;
  background: var(--panel);
}
.cmd .name {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
}
.cmd .what { color: var(--text); margin: 6px 0 4px; }
.cmd .when { color: var(--muted); font-size: 0.9rem; margin: 0; }

footer { padding: 40px 0 60px; text-align: center; color: var(--muted); font-size: 0.85rem; }

@media (max-width: 640px) {
  .nav-title { display: none; }
  .nav-links a { font-size: 0.8rem; }
  main section { padding: 40px 0; }
  pre { font-size: 0.8rem; padding: 12px 14px; }
}