/* ── Design tokens ── */
:root {
  --background:     oklch(1 0 0);
  --foreground:     oklch(0.148 0.004 228.8);
  --muted:          oklch(0.963 0.002 197.1);
  --muted-fg:       oklch(0.56 0.021 213.5);
  --border:         oklch(0.925 0.005 214.3);
  --primary:        oklch(0.5 0.134 242.749);
  --primary-strong: oklch(0.443 0.11 240.79);
  --content-width:  720px;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; }

html,
body {
  overscroll-behavior: none;
}

body {
  margin: 0;
  font-family: "Figtree", system-ui, sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  background: var(--background);
  color: var(--foreground);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-strong); }

/* ── Header ── */
.site-header {
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--foreground);
  font-weight: 600;
  font-size: 0.95rem;
}

.brand:hover { color: var(--foreground); }

.brand-logo {
  width: 24px;
  height: 24px;
}

.nav-link {
  font-size: 0.875rem;
  color: var(--muted-fg);
}

.nav-link:hover { color: var(--foreground); }

/* ── Main content ── */
.site-main {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}

/* ── Typography ── */
h1, h2, h3 {
  margin: 0 0 0.5rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--foreground);
}

h1 { font-size: clamp(1.75rem, 4vw, 2.25rem); font-weight: 700; }
h2 { font-size: 1.125rem; font-weight: 600; margin-top: 2.5rem; }

p { margin: 0 0 1rem; }

/* ── Banner image ── */
.banner {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  margin: 1.75rem 0;
}

/* ── Code blocks ── */
code, pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.875em;
}

pre {
  overflow-x: auto;
  margin: 0.75rem 0 1.5rem;
  padding: 1rem 1.25rem;
  background: var(--muted);
  border: 1px solid var(--border);
  border-radius: 8px;
}

p code, li code {
  padding: 0.1em 0.35em;
  background: var(--muted);
  border-radius: 4px;
}

/* ── Tagline ── */
.tagline {
  font-size: 1.0625rem;
  color: var(--muted-fg);
  margin: 0.25rem 0 1.25rem;
}

/* ── Copy block ── */
.code-copy-block {
  position: relative;
  margin: 0.75rem 0 1.5rem;
}

.code-copy-block pre {
  margin: 0;
  padding-right: 5rem;
}

.copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  padding: 0.25rem 0.625rem;
  font-family: inherit;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--muted-fg);
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  transition: color 0.1s, border-color 0.1s;
}

.copy-btn:hover {
  color: var(--foreground);
  border-color: oklch(0.8 0.005 214.3);
}

.copy-btn.copied {
  color: oklch(0.5 0.134 142);
  border-color: oklch(0.8 0.08 142);
}

/* ── Note ── */
.note {
  margin-top: 0.5rem;
  font-size: 0.875rem;
  color: var(--muted-fg);
}

/* ── Footer ── */
.site-footer {
  border-top: 1px solid var(--border);
}

.footer-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
  font-size: 0.875rem;
  color: var(--muted-fg);
}

.footer-inner p { margin: 0; }

/* ── Responsive ── */
@media (max-width: 640px) {
  .site-main { padding: 2rem 1.25rem 4rem; }
  .header-inner { padding: 0 1.25rem; }
  .footer-inner { padding: 1rem 1.25rem; }
}