/* ============================================================
   fonts.css — Self-hosted WOFF2 (Latin subset)
   Phase 9: replaces Google Fonts external stylesheet.

   Files in /static/fonts/:
     source-serif-4-normal-latin[-ext].woff2   — variable, wght 200–900
     source-serif-4-italic-latin[-ext].woff2   — variable, wght 200–900
     manrope-latin[-ext].woff2                 — variable, wght 300–700
     instrument-serif-normal-latin[-ext].woff2 — static, wght 400
     instrument-serif-italic-latin[-ext].woff2 — static, wght 400

   Load order matters: latin-ext must appear BEFORE latin so the
   browser's unicode-range matching prefers latin-ext for extended
   Latin characters, falling back to the smaller latin file.
   ============================================================ */

/* ===== Source Serif 4 — Reading body font (variable, 200–900) ===== */

/* italic, latin-ext */
@font-face {
  font-family: 'Source Serif 4';
  font-style: italic;
  font-weight: 200 900;
  font-display: swap;
  src: url(/static/fonts/source-serif-4-italic-latin-ext.woff2) format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7,
    U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F,
    U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F,
    U+A720-A7FF;
}
/* italic, latin */
@font-face {
  font-family: 'Source Serif 4';
  font-style: italic;
  font-weight: 200 900;
  font-display: swap;
  src: url(/static/fonts/source-serif-4-italic-latin.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6,
    U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122,
    U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
/* normal, latin-ext */
@font-face {
  font-family: 'Source Serif 4';
  font-style: normal;
  font-weight: 200 900;
  font-display: swap;
  src: url(/static/fonts/source-serif-4-normal-latin-ext.woff2) format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7,
    U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F,
    U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F,
    U+A720-A7FF;
}
/* normal, latin */
@font-face {
  font-family: 'Source Serif 4';
  font-style: normal;
  font-weight: 200 900;
  font-display: swap;
  src: url(/static/fonts/source-serif-4-normal-latin.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6,
    U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122,
    U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* ===== Source Serif 4 Fallback — CLS prevention via size-adjust ===== */
/*
 * Adjusts Georgia to match Source Serif 4's metrics so the font-swap
 * causes zero layout shift. Values calculated from actual OS/2 tables:
 *   Source Serif 4: x-height 47.5%, ascender 103.6%, descender 33.5%
 *   Georgia:        x-height 44.7% (known reference)
 *   size-adjust = ss4_xh / georgia_xh = 47.5 / 44.7 = 106.2%
 */
@font-face {
  font-family: 'Source Serif 4 Fallback';
  src: local('Georgia'), local('Georgia Regular');
  size-adjust: 106.2%;
  ascent-override: 97.6%;
  descent-override: 31.5%;
  line-gap-override: 0%;
}

/* ===== Manrope — UI font (variable, 300–700) ===== */

/* latin-ext */
@font-face {
  font-family: 'Manrope';
  font-style: normal;
  font-weight: 300 700;
  font-display: swap;
  src: url(/static/fonts/manrope-latin-ext.woff2) format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7,
    U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F,
    U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F,
    U+A720-A7FF;
}
/* latin */
@font-face {
  font-family: 'Manrope';
  font-style: normal;
  font-weight: 300 700;
  font-display: swap;
  src: url(/static/fonts/manrope-latin.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6,
    U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122,
    U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* ===== Manrope Fallback — CLS prevention ===== */
/*
 * Manrope x-height 54.0%, system-ui x-height ~52%
 * size-adjust = manrope_xh / sys_xh = 54.0 / 52.0 = 103.8%
 */
@font-face {
  font-family: 'Manrope Fallback';
  src: local('system-ui'), local('-apple-system'), local('BlinkMacSystemFont');
  size-adjust: 103.8%;
  ascent-override: 102.7%;
  descent-override: 28.9%;
  line-gap-override: 0%;
}

/* ===== Instrument Serif — Display/heading font (static, 400) ===== */

/* italic, latin-ext */
@font-face {
  font-family: 'Instrument Serif';
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url(/static/fonts/instrument-serif-italic-latin-ext.woff2) format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7,
    U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F,
    U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F,
    U+A720-A7FF;
}
/* italic, latin */
@font-face {
  font-family: 'Instrument Serif';
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url(/static/fonts/instrument-serif-italic-latin.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6,
    U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122,
    U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
/* normal, latin-ext */
@font-face {
  font-family: 'Instrument Serif';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url(/static/fonts/instrument-serif-normal-latin-ext.woff2) format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7,
    U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F,
    U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F,
    U+A720-A7FF;
}
/* normal, latin */
@font-face {
  font-family: 'Instrument Serif';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url(/static/fonts/instrument-serif-normal-latin.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6,
    U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122,
    U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}