/* Shared site header and footer. Self-contained tokens so pages with their own
   palette still get identical chrome. Edges align with a 1200px content column. */

:root {
  --chrome-bg: #fafafc;
  --chrome-ink: #06070d;
  --chrome-soft: rgba(6,7,13,0.68);
  --chrome-rule: rgba(6,7,13,0.10);
  --chrome-accent: #2563eb;
  --chrome-on-accent: #ffffff;
  --chrome-display: "Newsreader", "Times New Roman", serif;
  --chrome-body: "Inter Tight", -apple-system, BlinkMacSystemFont, sans-serif;
  --chrome-mono: "JetBrains Mono", ui-monospace, Menlo, monospace;
}
[data-theme="dark"] {
  --chrome-bg: #04050a;
  --chrome-ink: #f4f4f6;
  --chrome-soft: rgba(244,244,246,0.70);
  --chrome-rule: rgba(244,244,246,0.10);
  --chrome-accent: #5b8efb;
  --chrome-on-accent: #04050a;
}

/* Legacy page wrapper around the header: drop its own sticky box, blur and rule. */
.nav-wrap { display: contents; }
.site-nav {
  position: sticky; top: 0; z-index: 100;
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 0 24px; margin: 0; width: 100%; max-width: none; height: auto;
  padding: 8px max(clamp(20px, 5vw, 48px), calc((100% - 1200px) / 2));
  background: var(--chrome-bg);
  border: 0; border-bottom: 1px solid var(--chrome-rule);
  box-shadow: none; backdrop-filter: none; -webkit-backdrop-filter: none;
  font-family: var(--chrome-body); font-size: 15px; line-height: 1.4;
  text-align: left; box-sizing: border-box;
}
.site-nav *, .site-footer * { box-sizing: border-box; }
.site-nav > nav {
  all: unset; display: block;
  order: 3; width: 100%;
}
.site-nav a {
  margin: 0; padding: 0; border: 0; border-radius: 0; background: none;
  text-decoration: none; letter-spacing: normal; text-transform: none;
  font-family: var(--chrome-body);
}
.site-nav .wordmark {
  display: inline-block; line-height: 44px;
  font-family: var(--chrome-display); font-size: 18px; font-weight: 400;
  font-variation-settings: "opsz" 14, "SOFT" 0;
  letter-spacing: -0.01em; color: var(--chrome-ink);
  -webkit-text-fill-color: currentColor; background: none;
}
.site-nav .wordmark em { font-style: italic; color: var(--chrome-accent); }
.site-nav ul {
  list-style: none; display: flex; flex-wrap: wrap; gap: 0 24px;
  margin: 0; padding: 0;
}
.site-nav li { margin: 0; padding: 0; }
.site-nav li::before { content: none; }
.site-nav ul a {
  display: inline-flex; align-items: center; min-height: 44px;
  padding: 0; border-radius: 0;
  font-size: 15px; font-weight: 400; color: var(--chrome-soft);
  transition: color 200ms;
}
.site-nav ul a:hover, .site-nav ul a[aria-current="page"] { color: var(--chrome-ink); background: none; }
.site-nav .nav-end { display: flex; align-items: center; gap: 12px; }
.site-nav .nav-button {
  display: inline-flex; align-items: center; min-height: 40px;
  padding: 0 16px; border-radius: 6px;
  background: var(--chrome-accent); color: var(--chrome-on-accent);
  font-size: 15px; font-weight: 600; white-space: nowrap;
  transition: background 200ms;
}
.site-nav .nav-button:hover { background: color-mix(in srgb, var(--chrome-accent) 86%, var(--chrome-ink)); color: var(--chrome-on-accent); }
.theme-switch {
  width: 40px; height: 40px; padding: 0; margin: 0;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--chrome-rule); border-radius: 6px;
  background: transparent; color: var(--chrome-ink); cursor: pointer;
  transition: border-color 200ms;
}
.theme-switch:hover { border-color: var(--chrome-soft); }
.theme-switch svg { width: 16px; height: 16px; }
[data-theme-lock] .theme-switch { display: none; }
[data-theme="light"] .theme-switch .sun,
[data-theme="dark"] .theme-switch .moon { display: none; }
@media (min-width: 760px) {
  .site-nav > nav { order: 0; width: auto; margin-left: auto; }
}

.site-footer {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: center;
  gap: 0 8px; margin: 0; width: 100%; max-width: none;
  padding: 24px max(clamp(20px, 5vw, 48px), calc((100% - 1200px) / 2));
  background: var(--chrome-bg);
  border: 0; border-top: 1px solid var(--chrome-rule);
  font-family: var(--chrome-body); font-size: 14px; line-height: 1.4;
  letter-spacing: normal; text-transform: none; text-align: center;
  color: var(--chrome-soft);
}
.site-footer a {
  display: inline-flex; align-items: center; min-height: 44px;
  margin: 0; padding: 0; border: 0; background: none;
  color: var(--chrome-soft); text-decoration: underline;
  text-decoration-color: transparent; text-underline-offset: 4px;
  font-family: var(--chrome-body); font-size: 14px;
  transition: color 200ms, text-decoration-color 200ms;
}
.site-footer a:hover { color: var(--chrome-ink); text-decoration-color: currentColor; }

:where(a, button, input, select, textarea, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--chrome-accent); outline-offset: 2px; border-radius: 6px;
}