/* ═══════════════════════════════════════════════════════════════════════════
   Milky Way Calendar — global styles, design tokens, brand type (D-DIN)
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Brand typeface: D-DIN (three widths, three jobs) ─────────────────────── */

@font-face {
  font-family: 'D-DIN';
  src: url('/d-din/D-DIN.otf') format('opentype');
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'D-DIN';
  src: url('/d-din/D-DIN-Bold.otf') format('opentype');
  font-weight: 700; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'D-DIN';
  src: url('/d-din/D-DIN-Italic.otf') format('opentype');
  font-weight: 400; font-style: italic; font-display: swap;
}
@font-face {
  font-family: 'D-DIN Condensed';
  src: url('/d-din/D-DINCondensed.otf') format('opentype');
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'D-DIN Condensed';
  src: url('/d-din/D-DINCondensed-Bold.otf') format('opentype');
  font-weight: 700; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'D-DIN Exp';
  src: url('/d-din/D-DINExp.otf') format('opentype');
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'D-DIN Exp';
  src: url('/d-din/D-DINExp-Bold.otf') format('opentype');
  font-weight: 700; font-style: normal; font-display: swap;
}

/* ── Design tokens ────────────────────────────────────────────────────────── */

:root {
  /* Shell — deep, cool astronomical night */
  --void: #07080d;
  --surface: #0e1119;
  --surface-2: #161a25;
  --hairline: #232a3b;
  --text: #e8edf6;
  --text-dim: #9aa4ba;
  --text-faint: #5d6679;
  --azure: #6aa8ff;       /* interactive accent / twilight blue */
  --starlight: #f3e7c0;   /* best / highlight pale gold */

  /* Data bars — same meanings as before, lightly tuned */
  --gc-prime: #34d17e;    /* GC > 10°, moon-free: the prime window */
  --mw-free: #1f9a57;     /* MW visible, moon-free */
  --mw-lit: #1b6b40;      /* MW visible, moon up */
  --moon: 255, 196, 84;   /* rgb tuple; opacity scales with illumination */
  --night: #05060b;
  --day: #2b3142;
  --tw-a: #221a4a;        /* twilight gradient, sky side */
  --tw-b: #0b0c1c;        /* twilight gradient, night side */

  /* Event hues (ticks + labels) */
  --sun: #f2a65a;
  --dark: #89b4fa;
  --mw: #a6e3a1;
  --moon-lbl: #f9e2af;

  /* Type */
  --font-body: 'D-DIN', system-ui, sans-serif;
  --font-display: 'D-DIN Condensed', 'D-DIN', system-ui, sans-serif;
  --font-label: 'D-DIN Exp', 'D-DIN', system-ui, sans-serif;

  /* Spacing scale */
  --sp-1: 0.25rem; --sp-2: 0.5rem; --sp-3: 0.75rem;
  --sp-4: 1rem;    --sp-5: 1.5rem; --sp-6: 2.5rem;

  /* Layout */
  --content-max: 1400px;
  --radius: 6px;
}

/* ── Night-vision (red) mode — preserves dark adaptation in the field.
   Meanings encoded by BRIGHTNESS, not hue: everything is a shade of red. ── */

[data-theme="night-vision"] {
  --void: #0a0202;
  --surface: #160404;
  --surface-2: #220808;
  --hairline: #3a1110;
  --text: #d2493a;
  --text-dim: #8f2f25;
  --text-faint: #5a201a;
  --azure: #d2493a;
  --starlight: #ff8a66;

  --gc-prime: #ff5a42;    /* brightest red = prime window */
  --mw-free: #b83a2b;
  --mw-lit: #7a2418;
  --moon: 255, 110, 70;
  --night: #0a0202;
  --day: #2a0d09;
  --tw-a: #3a1110;
  --tw-b: #140404;

  --sun: #e0564a;
  --dark: #b04030;
  --mw: #ff8a66;
  --moon-lbl: #ff7a52;
}

/* ── Base ─────────────────────────────────────────────────────────────────── */

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

body {
  margin: 0;
  background: var(--void);
  color: var(--text);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

:focus-visible {
  outline: 2px solid var(--azure);
  outline-offset: 2px;
  border-radius: 3px;
}

/* ── Static site header ─────────────────────────────────────────────────── */

#site-header {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--sp-5) var(--sp-4) 0;
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}

#site-header .brand-mark {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

#site-header .brand-mark img {
  height: 52px;
  width: auto;
  display: block;
  opacity: 0.95;
  transition: opacity 0.15s;
}

#site-header .brand-mark:hover img { opacity: 1; }

#site-header .wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 2.4rem;
  line-height: 1;
  letter-spacing: 0.01em;
  margin: 0 0 var(--sp-1);
  color: var(--text);
}

#site-header .subtitle {
  margin: 0;
  font-family: var(--font-label);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--text-faint);
  font-size: 0.68rem;
}

#theme-toggle { flex-shrink: 0; margin-left: auto; }

/* ── Static site footer ─────────────────────────────────────────────────── */

#site-footer {
  max-width: var(--content-max);
  margin: var(--sp-6) auto 0;
  padding: var(--sp-5) var(--sp-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  border-top: 1px solid var(--hairline);
}

#site-footer .copy {
  font-size: 0.72rem;
  color: var(--text-faint);
  letter-spacing: 0.03em;
}

#site-footer .copy a {
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.15s;
}

#site-footer .copy a:hover { color: var(--azure); }

#site-footer .gh-link {
  display: flex;
  align-items: center;
  color: var(--text-faint);
  transition: color 0.15s;
}

#site-footer .gh-link:hover { color: var(--azure); }

#site-footer .gh-icon { width: 18px; height: 18px; }

/* ── About section ──────────────────────────────────────────────────────── */

#about {
  max-width: 900px;
  margin: var(--sp-6) auto 0;
  padding: var(--sp-6) var(--sp-4) 0;
  color: var(--text);
  border-top: 1px solid var(--hairline);
}

#about h1 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  margin: 0 0 var(--sp-4);
  color: var(--text);
}

#about h2 {
  font-family: var(--font-label);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.85rem;
  font-weight: 700;
  margin: var(--sp-6) 0 var(--sp-3);
  color: var(--azure);
}

#about p {
  margin: 0 0 var(--sp-3);
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-dim);
}

#about dl { margin: 0; }

#about dt {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  margin-top: var(--sp-5);
}

#about dd {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-dim);
  margin: var(--sp-1) 0 0 0;
}

@media (max-width: 560px) {
  #site-header { flex-wrap: wrap; }
  #site-header .wordmark { font-size: 2rem; }
  #site-header .brand-mark img { height: 42px; }
  #site-footer { flex-wrap: wrap; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}