/* ═══════════════════════════════════════════════════════════════════════════
   fonts.css — self-hosted type, zero third-party requests (spec §2)
   Two OFL families, four woff2 files, subset with pyftsubset
   (latin + box-drawing + UI glyph set), content-hashed filenames.

   PROVENANCE (sha256 of each served file — substrate honesty):
     fonts/MartianMonoVF.dda1215d.woff2          46,984 B
       sha256 dda1215df5f7f98c2228bd47aa70f82aea228d71d071facf96a498735b5822a4
       from Martian Mono v1.1.0 VF (github.com/evilmartians/mono, OFL 1.1)
       axes kept: wght 100–800 · wdth 75–112.5
     fonts/IBMPlexMono-Regular.6490a869.woff2    11,124 B
       sha256 6490a86976941a02aa0578c6c1aa4218d551df88cb138095717d6a003860edf2
     fonts/IBMPlexMono-Medium.2f17816d.woff2     11,096 B
       sha256 2f17816d2699d189494732df98b314f62e004beba50716a233837cd9ac7574c5
     fonts/IBMPlexMono-Italic.7bb0d402.woff2     12,576 B
       sha256 7bb0d4022d64087051176c3a6a0d535027fb087f1a2c6b33ffdb49510b0a6bda
       from IBM Plex Mono v1.1.0 (github.com/IBM/plex, OFL 1.1)
     total 81,780 B ≈ 81.8 KB — under the 95 KB shared-font budget (spec §7).
     Licenses: fonts/LICENSES.txt

   GLYPH COVERAGE (honest): the families ship latin, box-drawing (─│┼…),
   block elements (▌█, Plex), ✓→↑↓ (both), ✗ (Martian). The UI glyphs
   ⌁ ◇ ◉ ◌ ▮ ● ▸ ⠿ do NOT exist in either upstream family — they render
   per-glyph from the system fallback stack by design. Do not claim
   otherwise in copy.

   FALLBACK METRICS: 'Martian Mono Fallback' / 'Plex Mono Fallback' are
   metric-tuned Menlo (size-adjust + ascent/descent overrides computed
   from the real font tables) so font-display:swap reflow ≈ 0 CLS.
     Menlo      adv 1233/2048 = 0.60205 em
     Plex Mono  adv  600/1000 = 0.600 em · hhea 1025/-275/0
     Martian VF adv  750/1000 = 0.750 em · hhea 1000/-200/0
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Webfonts ─────────────────────────────────────────────────────────────── */

@font-face {
  font-family: 'Martian Mono';
  src: url('fonts/MartianMonoVF.dda1215d.woff2') format('woff2');
  font-weight: 100 800;
  font-stretch: 75% 112.5%;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6,
    U+02DA, U+02DC, U+2009-200A, U+2013-2014, U+2018-201E, U+2020-2022,
    U+2026, U+2030, U+2039-203A, U+2044, U+2074, U+20AC, U+2122,
    U+2190-2199, U+2212, U+2215, U+2500-259F, U+2713, U+2717, U+FFFD;
}

@font-face {
  font-family: 'IBM Plex Mono';
  src: url('fonts/IBMPlexMono-Regular.6490a869.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6,
    U+02DA, U+02DC, U+2009-200A, U+2013-2014, U+2018-201E, U+2020-2022,
    U+2026, U+2030, U+2039-203A, U+2044, U+2074, U+20AC, U+2122,
    U+2190-2199, U+2212, U+2215, U+2500-259F, U+2713, U+FFFD;
}

@font-face {
  font-family: 'IBM Plex Mono';
  src: url('fonts/IBMPlexMono-Medium.2f17816d.woff2') format('woff2');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6,
    U+02DA, U+02DC, U+2009-200A, U+2013-2014, U+2018-201E, U+2020-2022,
    U+2026, U+2030, U+2039-203A, U+2044, U+2074, U+20AC, U+2122,
    U+2190-2199, U+2212, U+2215, U+2500-259F, U+2713, U+FFFD;
}

/* The translation voice — wall-clock glosses + plain-language lines (spec §2) */
@font-face {
  font-family: 'IBM Plex Mono';
  src: url('fonts/IBMPlexMono-Italic.7bb0d402.woff2') format('woff2');
  font-weight: 400;
  font-style: italic;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6,
    U+02DA, U+02DC, U+2009-200A, U+2013-2014, U+2018-201E, U+2020-2022,
    U+2026, U+2030, U+2039-203A, U+2044, U+2074, U+20AC, U+2122,
    U+2190-2199, U+2212, U+2215, U+2500-259F, U+2713, U+FFFD;
}

/* ── Metric-tuned local fallbacks (swap CLS ≈ 0) ──────────────────────────────
   size-adjust = primary_advance / menlo_advance
   ascent/descent-override = (metric / upm) / size-adjust   (next-font formula)
   Martian:  S = 0.750/0.60205 = 124.57% · asc 1.000/1.2457 · desc 0.200/1.2457
   Plex:     S = 0.600/0.60205 =  99.66% · asc 1.025/0.9966 · desc 0.275/0.9966 */

@font-face {
  font-family: 'Martian Mono Fallback';
  src: local('Menlo');
  size-adjust: 124.57%;
  ascent-override: 80.27%;
  descent-override: 16.05%;
  line-gap-override: 0%;
}

@font-face {
  font-family: 'Plex Mono Fallback';
  src: local('Menlo');
  size-adjust: 99.66%;
  ascent-override: 102.85%;
  descent-override: 27.59%;
  line-gap-override: 0%;
}

/* ── Family stacks — consume these tokens, never name families directly ───── */

:root {
  /* display / H1–H2 / hero / big data (spec §2 row 1) */
  --font-display: 'Martian Mono', 'Martian Mono Fallback',
    ui-monospace, 'SF Mono', Menlo, monospace;
  /* body / UI / data / code + italic translations (spec §2 row 2) */
  --font-body: 'IBM Plex Mono', 'Plex Mono Fallback',
    ui-monospace, 'SF Mono', Menlo, monospace;
}

/* ── Save-Data / reduced-data: no font download, fallback stack only (§3.5)
   Pages must also gate their <link rel="preload"> with
   media="(prefers-reduced-data: no-preference)" or the preload still fires. */

@media (prefers-reduced-data: reduce) {
  :root {
    --font-display: 'Martian Mono Fallback',
      ui-monospace, 'SF Mono', Menlo, monospace;
    --font-body: 'Plex Mono Fallback',
      ui-monospace, 'SF Mono', Menlo, monospace;
  }
}