:root {
  color-scheme: light dark;
  --bg: #f2f5f9;
  --text: #10151c;
  --text-dim: #4c5b6b;
  --accent: #1463c9;
  --border: rgba(16,25,45,0.14);
  --border-strong: rgba(16,25,45,0.28);
  --surface: rgba(20,60,120,0.045);
  --warn-bg: rgba(230,150,20,0.1);
  --warn-border: rgba(230,150,20,0.4);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0e15;
    --text: #edf1f6;
    --text-dim: #9aa7ba;
    --accent: #4fa8ff;
    --border: rgba(150,190,255,0.16);
    --border-strong: rgba(150,190,255,0.32);
    --surface: rgba(120,170,255,0.05);
    --warn-bg: rgba(255,190,80,0.08);
    --warn-border: rgba(255,190,80,0.35);
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.wrap { max-width: 720px; margin: 0 auto; padding: 0 24px; }

.site-nav {
  height: 64px;
  display: flex; align-items: center;
  border-block-end: 1px solid var(--border);
}
.site-nav .wrap { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.wordmark { font-family: var(--font-mono); font-size: 0.85rem; letter-spacing: 0.03em; text-decoration: none; color: var(--text); }
.lang-switch { display: flex; gap: 6px; font-family: var(--font-mono); font-size: 0.78rem; }
.lang-switch a {
  text-decoration: none; padding: 4px 8px; border: 1px solid var(--border); color: var(--text-dim);
}
.lang-switch a[aria-current="page"] { color: var(--accent); border-color: var(--accent); }
.lang-switch a:hover, .lang-switch a:focus-visible { color: var(--text); border-color: var(--border-strong); }

main { padding-block: 40px 80px; }

.eyebrow { font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.05em; color: var(--text-dim); margin: 0 0 14px; }
h1 { font-weight: 800; letter-spacing: -0.02em; line-height: 1.1; font-size: clamp(2rem, 6vw, 2.8rem); margin: 0 0 20px; }
.lede { font-size: 1.1rem; color: var(--text-dim); max-width: 56ch; margin: 0 0 28px; }

.notice {
  font-size: 0.92rem;
  background: var(--warn-bg);
  border: 1px solid var(--warn-border);
  padding: 12px 16px;
  margin: 0 0 32px;
}

.btn {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 0.9rem; letter-spacing: 0.02em;
  text-decoration: none; color: var(--bg); background: var(--accent);
  border: 1px solid var(--accent);
  padding: 14px 22px;
  transition: opacity 0.2s ease, transform 0.15s ease;
}
.btn:hover, .btn:focus-visible { opacity: 0.85; }
.btn:active { transform: translateY(1px); }
.btn-ghost { background: transparent; color: var(--accent); }

section { padding-block: 48px; border-block-start: 1px solid var(--border); }
h2 { font-weight: 700; letter-spacing: -0.01em; font-size: 1.4rem; margin: 0 0 16px; }
.commands { list-style: none; margin: 0; padding: 0; font-family: var(--font-mono); font-size: 0.92rem; }
.commands li { padding: 10px 0; border-block-end: 1px solid var(--border); display: flex; gap: 12px; flex-wrap: wrap; }
.commands li:last-child { border-block-end: none; }
.commands code { color: var(--accent); unicode-bidi: isolate; direction: ltr; }

.tester-block { background: var(--surface); border: 1px solid var(--border); padding: 24px; margin-block-start: 16px; }
.tester-block p { color: var(--text-dim); margin: 0 0 18px; max-width: 60ch; }

footer.site-footer {
  padding-block: 28px 40px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  border-block-start: 1px solid var(--border);
}
footer.site-footer a { color: var(--text-dim); text-decoration: underline; }

@media (max-width: 560px) {
  .site-nav { height: auto; }
  .site-nav .wrap { flex-wrap: wrap; gap: 10px 16px; padding-block: 14px; }
  .lang-switch { flex-wrap: wrap; }
}

@media (max-width: 480px) {
  .wrap { padding: 0 18px; }
  section { padding-block: 36px; }
  .btn { width: 100%; justify-content: center; }
}