/* bzm2-hwref — light/dark theme tokens + chrome
 * Visual family: Ubuntu + Orbitron + JetBrains Mono (shared with Mujina site).
 * Usage: <html data-theme="light|dark"> via site/js/theme.js
 *        localStorage key: hwref-theme
 */

:root {
  --bg: #f4f1ec;
  --bg-elevated: #faf8f5;
  --surface: #ffffff;
  --ink: #1a1917;
  --ink-soft: #3d3a36;
  --muted: #6b665e;
  --faint: #9a948a;
  --line: rgba(26, 25, 23, 0.08);
  --line-strong: rgba(26, 25, 23, 0.14);
  --shadow: 0 1px 2px rgba(26, 25, 23, 0.04), 0 8px 24px rgba(26, 25, 23, 0.06);
  --shadow-card: 0 1px 3px rgba(26, 25, 23, 0.05), 0 12px 32px rgba(26, 25, 23, 0.07);

  --accent-warm: #E86A2B;
  --accent-warm-soft: rgba(232, 106, 43, 0.12);
  --accent-warm-mid: rgba(232, 106, 43, 0.22);
  --accent-cool: #1FA6A0;
  --accent-cool-soft: rgba(31, 166, 160, 0.12);
  --accent-cool-mid: rgba(31, 166, 160, 0.22);

  --wash-warm: rgba(232, 106, 43, 0.07);
  --wash-cool: rgba(31, 166, 160, 0.07);
  --nav-bg: rgba(244, 241, 236, 0.82);
  --hover-fill: rgba(26, 25, 23, 0.06);
  --code-bg: rgba(26, 25, 23, 0.06);
  --ink-inverse: #f4f1ec;

  --font: "Ubuntu", ui-sans-serif, system-ui, -apple-system, sans-serif;
  --display: "Orbitron", ui-sans-serif, system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --radius: 14px;
  --radius-sm: 10px;
  --radius-pill: 999px;
  --max: 1120px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  color-scheme: light;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0e1114;
  --bg-elevated: #1c2329;
  --surface: #151a1f;
  --ink: #d6dde3;
  --ink-soft: #b8c2ca;
  --muted: #7a8792;
  --faint: #556069;
  --line: rgba(214, 221, 227, 0.1);
  --line-strong: rgba(214, 221, 227, 0.16);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.35), 0 8px 24px rgba(0, 0, 0, 0.45);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.4), 0 12px 32px rgba(0, 0, 0, 0.5);

  --accent-warm: #E86A2B;
  --accent-warm-soft: rgba(232, 106, 43, 0.18);
  --accent-warm-mid: rgba(232, 106, 43, 0.32);
  --accent-cool: #2dd4bf;
  --accent-cool-soft: rgba(45, 212, 191, 0.14);
  --accent-cool-mid: rgba(45, 212, 191, 0.28);

  --wash-warm: rgba(232, 106, 43, 0.09);
  --wash-cool: rgba(45, 212, 191, 0.08);
  --nav-bg: rgba(14, 17, 20, 0.88);
  --hover-fill: rgba(214, 221, 227, 0.08);
  --code-bg: rgba(214, 221, 227, 0.08);
  --ink-inverse: #0e1114;
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]):not([data-theme="dark"]) {
    color-scheme: dark;
    --bg: #0e1114;
    --bg-elevated: #1c2329;
    --surface: #151a1f;
    --ink: #d6dde3;
    --ink-soft: #b8c2ca;
    --muted: #7a8792;
    --faint: #556069;
    --line: rgba(214, 221, 227, 0.1);
    --line-strong: rgba(214, 221, 227, 0.16);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.35), 0 8px 24px rgba(0, 0, 0, 0.45);
    --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.4), 0 12px 32px rgba(0, 0, 0, 0.5);
    --accent-cool: #2dd4bf;
    --accent-cool-soft: rgba(45, 212, 191, 0.14);
    --accent-cool-mid: rgba(45, 212, 191, 0.28);
    --nav-bg: rgba(14, 17, 20, 0.88);
    --hover-fill: rgba(214, 221, 227, 0.08);
    --code-bg: rgba(214, 221, 227, 0.08);
    --ink-inverse: #0e1114;
  }
}

.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  background: var(--nav-bg);
  border-bottom: 1px solid var(--line);
}

.site-nav .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  min-height: 52px;
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
  padding: 0.35rem 0;
  flex-wrap: wrap;
}

.nav-brand {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
  text-decoration: none;
}
.nav-brand span.accent { color: var(--accent-cool); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.1rem;
  overflow-x: auto;
  scrollbar-width: none;
  flex: 1 1 auto;
  min-width: 0;
  justify-content: flex-end;
}
.nav-links::-webkit-scrollbar { display: none; }

.nav-links a {
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--muted);
  padding: 0.35rem 0.55rem;
  border-radius: var(--radius-pill);
  white-space: nowrap;
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}
.nav-links a:hover,
.nav-links a.active,
.nav-links a[aria-current="page"] {
  color: var(--ink);
  background: var(--hover-fill);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  background: var(--surface);
  padding: 0.15rem;
}
.theme-toggle button {
  font-family: var(--font);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  background: transparent;
  border: none;
  border-radius: var(--radius-pill);
  padding: 0.28rem 0.55rem;
  cursor: pointer;
}
.theme-toggle button[aria-pressed="true"] {
  color: var(--ink);
  background: var(--hover-fill);
}
.theme-toggle button:focus-visible {
  outline: 2px solid var(--accent-cool);
  outline-offset: 1px;
}

.nav-menu-toggle {
  display: none;
  font-family: var(--font);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  padding: 0.32rem 0.7rem;
  cursor: pointer;
  flex-shrink: 0;
}
.nav-menu-toggle:hover,
.nav-menu-toggle[aria-expanded="true"] {
  color: var(--ink);
  background: var(--hover-fill);
}
.nav-menu-toggle:focus-visible {
  outline: 2px solid var(--accent-cool);
  outline-offset: 1px;
}

@media (max-width: 840px) {
  .nav-brand { display: none; }
  .site-nav .inner {
    flex-wrap: nowrap;
  }
  .nav-menu-toggle {
    display: inline-flex;
    align-items: center;
    margin-left: auto;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: calc(100% + 1px);
    left: 0;
    right: 0;
    z-index: 45;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0.15rem;
    padding: 0.65rem 0.85rem 0.85rem;
    background: var(--nav-bg);
    backdrop-filter: blur(14px) saturate(1.2);
    -webkit-backdrop-filter: blur(14px) saturate(1.2);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow);
    overflow: visible;
    flex: none;
    max-height: min(70vh, 420px);
    overflow-y: auto;
  }
  .nav-links.is-open {
    display: flex;
  }
  .nav-links a {
    white-space: normal;
    padding: 0.5rem 0.65rem;
  }
  .site-nav {
    position: sticky;
  }
}

html { scroll-padding-top: 72px; }