/* New Computer Modern (NCM) webfont setup — Antonis Tsolomitis's successor to
   Computer Modern Unicode, distributed on CTAN (fonts/newcomputermodern) under
   the GUST Font License (see "GUST Font License.txt" beside the font files).

   Replaces the old CMU cmun*.ttf set. Two things NCM buys us over CMU: real
   OpenType features — `smcp`/`c2sc` small caps and `onum` oldstyle figures,
   none of which CMU's TTFs carried, so `font-variant-caps` no longer has to be
   synthesized by the browser — and a much wider, better-hinted glyph set.

   Shipped as woff2 rather than the upstream .otf: the CFF outlines compress to
   roughly half (e.g. NewCM10-Regular 701 KB otf -> 325 KB woff2), and every
   browser that renders this book supports it. Files live in src/fonts/ and
   mdBook copies them next to this stylesheet.

   IMPORTANT — do not regenerate these from the upstream .otf by straight
   conversion. NewCM10-Regular.otf and NewCM10-Italic.otf as published on CTAN
   contain malformed CFF charstrings in the Phonetic Extensions block
   (U+1D4D-U+1D5D): glyphs such as uni1D50 open with a `cntrmask` operator with
   zero preceding stem hints and an empty mask. OTS — the font sanitiser in both
   Chrome and Firefox — rejects the file outright with

       OTS parsing error: CFF : Failed validating CharStrings INDEX

   and the browser then silently falls back to Times for ALL body text and
   italics. (The Bold and Book cuts declare `hstemhm` properly and are fine,
   which makes the breakage easy to miss: headings look right.) These files are
   therefore rebuilt with that range dropped:

       pyftsubset NewCM10-Regular.otf --unicodes-file=<all cmap codepoints
         minus U+1D4D-U+1D5D> --layout-features='*' --glyph-names
         --flavor=woff2 --output-file=NewCM10-Regular.woff2

   `--layout-features='*'` is what keeps smcp/c2sc/onum alive; pyftsubset's
   default feature set would drop them. After regenerating, verify in a browser
   that the face actually loads — a rejected font is invisible in the page,
   it just quietly renders as Times.

   Files expected in the SAME folder as this CSS:
   NewCM10-{Regular,Italic,Bold,BoldItalic}.woff2
   NewCMSans10-{Regular,Oblique,Bold,BoldOblique}.woff2
   NewCMMono10-{Regular,Italic,Bold,BoldOblique}.woff2
*/

/* ===== New Computer Modern (serif / roman) ===== */
@font-face {
  font-family: "New Computer Modern";
  font-style: normal;
  font-weight: 400;
  src: url("NewCM10-Regular.woff2") format("woff2");
  font-display: swap;
}
@font-face {
  font-family: "New Computer Modern";
  font-style: italic;
  font-weight: 400;
  src: url("NewCM10-Italic.woff2") format("woff2"); /* true italic, not slanted */
  font-display: swap;
}
@font-face {
  font-family: "New Computer Modern";
  font-style: normal;
  font-weight: 700;
  src: url("NewCM10-Bold.woff2") format("woff2");
  font-display: swap;
}
@font-face {
  font-family: "New Computer Modern";
  font-style: italic;
  font-weight: 700;
  src: url("NewCM10-BoldItalic.woff2") format("woff2");
  font-display: swap;
}
/* NCM's serif has no separate slanted cut (unlike CMU, where these pointed at
   the Concrete italic), so an `oblique` request lands on the true italic. */
@font-face {
  font-family: "New Computer Modern";
  font-style: oblique;
  font-weight: 400;
  src: url("NewCM10-Italic.woff2") format("woff2");
  font-display: swap;
}
@font-face {
  font-family: "New Computer Modern";
  font-style: oblique;
  font-weight: 700;
  src: url("NewCM10-BoldItalic.woff2") format("woff2");
  font-display: swap;
}

/* If mdBook asks for 300/600/800, alias to nearest real weight. NCM also ships
   a heavier "Book" optical cut meant for screens; swapping the 400 rules to
   NewCM10-Book* is the one-line way to darken the page if the text ever reads
   too thin. */
@font-face {
  font-family: "New Computer Modern";
  font-style: normal;
  font-weight: 300;
  src: url("NewCM10-Regular.woff2") format("woff2");
  font-display: swap;
}
@font-face {
  font-family: "New Computer Modern";
  font-style: italic;
  font-weight: 300;
  src: url("NewCM10-Italic.woff2") format("woff2");
  font-display: swap;
}
@font-face {
  font-family: "New Computer Modern";
  font-style: normal;
  font-weight: 600;
  src: url("NewCM10-Bold.woff2") format("woff2");
  font-display: swap;
}
@font-face {
  font-family: "New Computer Modern";
  font-style: italic;
  font-weight: 600;
  src: url("NewCM10-BoldItalic.woff2") format("woff2");
  font-display: swap;
}
@font-face {
  font-family: "New Computer Modern";
  font-style: normal;
  font-weight: 800;
  src: url("NewCM10-Bold.woff2") format("woff2");
  font-display: swap;
}
@font-face {
  font-family: "New Computer Modern";
  font-style: italic;
  font-weight: 800;
  src: url("NewCM10-BoldItalic.woff2") format("woff2");
  font-display: swap;
}

/* ===== New Computer Modern Sans (optional, for UI bits) =====
   NCM's sans has no light cut, so the old CMU 300 (cmunsl) maps to Regular. */
@font-face {
  font-family: "New Computer Modern Sans";
  font-style: normal;
  font-weight: 300;
  src: url("NewCMSans10-Regular.woff2") format("woff2");
  font-display: swap;
}
@font-face {
  font-family: "New Computer Modern Sans";
  font-style: normal;
  font-weight: 400;
  src: url("NewCMSans10-Regular.woff2") format("woff2");
  font-display: swap;
}
/* The sans is slanted rather than truly italic; both requests get that cut. */
@font-face {
  font-family: "New Computer Modern Sans";
  font-style: italic;
  font-weight: 400;
  src: url("NewCMSans10-Oblique.woff2") format("woff2");
  font-display: swap;
}
@font-face {
  font-family: "New Computer Modern Sans";
  font-style: oblique;
  font-weight: 400;
  src: url("NewCMSans10-Oblique.woff2") format("woff2");
  font-display: swap;
}
@font-face {
  font-family: "New Computer Modern Sans";
  font-style: normal;
  font-weight: 700;
  src: url("NewCMSans10-Bold.woff2") format("woff2");
  font-display: swap;
}
@font-face {
  font-family: "New Computer Modern Sans";
  font-style: italic;
  font-weight: 700;
  src: url("NewCMSans10-BoldOblique.woff2") format("woff2");
  font-display: swap;
}
@font-face {
  font-family: "New Computer Modern Sans";
  font-style: oblique;
  font-weight: 700;
  src: url("NewCMSans10-BoldOblique.woff2") format("woff2");
  font-display: swap;
}

/* ===== New Computer Modern Mono (typewriter) =====
   NCM names the bold slanted cut BoldOblique; there is no BoldItalic. */
@font-face {
  font-family: "New Computer Modern Mono";
  font-style: normal;
  font-weight: 400;
  src: url("NewCMMono10-Regular.woff2") format("woff2");
  font-display: swap;
}
@font-face {
  font-family: "New Computer Modern Mono";
  font-style: italic;
  font-weight: 400;
  src: url("NewCMMono10-Italic.woff2") format("woff2");
  font-display: swap;
}
@font-face {
  font-family: "New Computer Modern Mono";
  font-style: normal;
  font-weight: 700;
  src: url("NewCMMono10-Bold.woff2") format("woff2");
  font-display: swap;
}
@font-face {
  font-family: "New Computer Modern Mono";
  font-style: italic;
  font-weight: 700;
  src: url("NewCMMono10-BoldOblique.woff2") format("woff2");
  font-display: swap;
}

/* ===== Yinit drop-cap initials (gwern-style) =====
   26 single-glyph files, one per capital. unicode-range makes the browser
   fetch ONLY the letter a page actually starts with. Used by the opt-in
   `.dropcap` wrapper class (see custom.css). */
@font-face {
  font-family: "Yinit";
  font-style: normal;
  font-weight: 400;
  src: url("Yinit-A.ttf") format("truetype");
  unicode-range: U+0041;
  font-display: swap;
}
@font-face {
  font-family: "Yinit";
  font-style: normal;
  font-weight: 400;
  src: url("Yinit-B.ttf") format("truetype");
  unicode-range: U+0042;
  font-display: swap;
}
@font-face {
  font-family: "Yinit";
  font-style: normal;
  font-weight: 400;
  src: url("Yinit-C.ttf") format("truetype");
  unicode-range: U+0043;
  font-display: swap;
}
@font-face {
  font-family: "Yinit";
  font-style: normal;
  font-weight: 400;
  src: url("Yinit-D.ttf") format("truetype");
  unicode-range: U+0044;
  font-display: swap;
}
@font-face {
  font-family: "Yinit";
  font-style: normal;
  font-weight: 400;
  src: url("Yinit-E.ttf") format("truetype");
  unicode-range: U+0045;
  font-display: swap;
}
@font-face {
  font-family: "Yinit";
  font-style: normal;
  font-weight: 400;
  src: url("Yinit-F.ttf") format("truetype");
  unicode-range: U+0046;
  font-display: swap;
}
@font-face {
  font-family: "Yinit";
  font-style: normal;
  font-weight: 400;
  src: url("Yinit-G.ttf") format("truetype");
  unicode-range: U+0047;
  font-display: swap;
}
@font-face {
  font-family: "Yinit";
  font-style: normal;
  font-weight: 400;
  src: url("Yinit-H.ttf") format("truetype");
  unicode-range: U+0048;
  font-display: swap;
}
@font-face {
  font-family: "Yinit";
  font-style: normal;
  font-weight: 400;
  src: url("Yinit-I.ttf") format("truetype");
  unicode-range: U+0049;
  font-display: swap;
}
@font-face {
  font-family: "Yinit";
  font-style: normal;
  font-weight: 400;
  src: url("Yinit-J.ttf") format("truetype");
  unicode-range: U+004A;
  font-display: swap;
}
@font-face {
  font-family: "Yinit";
  font-style: normal;
  font-weight: 400;
  src: url("Yinit-K.ttf") format("truetype");
  unicode-range: U+004B;
  font-display: swap;
}
@font-face {
  font-family: "Yinit";
  font-style: normal;
  font-weight: 400;
  src: url("Yinit-L.ttf") format("truetype");
  unicode-range: U+004C;
  font-display: swap;
}
@font-face {
  font-family: "Yinit";
  font-style: normal;
  font-weight: 400;
  src: url("Yinit-M.ttf") format("truetype");
  unicode-range: U+004D;
  font-display: swap;
}
@font-face {
  font-family: "Yinit";
  font-style: normal;
  font-weight: 400;
  src: url("Yinit-N.ttf") format("truetype");
  unicode-range: U+004E;
  font-display: swap;
}
@font-face {
  font-family: "Yinit";
  font-style: normal;
  font-weight: 400;
  src: url("Yinit-O.ttf") format("truetype");
  unicode-range: U+004F;
  font-display: swap;
}
@font-face {
  font-family: "Yinit";
  font-style: normal;
  font-weight: 400;
  src: url("Yinit-P.ttf") format("truetype");
  unicode-range: U+0050;
  font-display: swap;
}
@font-face {
  font-family: "Yinit";
  font-style: normal;
  font-weight: 400;
  src: url("Yinit-Q.ttf") format("truetype");
  unicode-range: U+0051;
  font-display: swap;
}
@font-face {
  font-family: "Yinit";
  font-style: normal;
  font-weight: 400;
  src: url("Yinit-R.ttf") format("truetype");
  unicode-range: U+0052;
  font-display: swap;
}
@font-face {
  font-family: "Yinit";
  font-style: normal;
  font-weight: 400;
  src: url("Yinit-S.ttf") format("truetype");
  unicode-range: U+0053;
  font-display: swap;
}
@font-face {
  font-family: "Yinit";
  font-style: normal;
  font-weight: 400;
  src: url("Yinit-T.ttf") format("truetype");
  unicode-range: U+0054;
  font-display: swap;
}
@font-face {
  font-family: "Yinit";
  font-style: normal;
  font-weight: 400;
  src: url("Yinit-U.ttf") format("truetype");
  unicode-range: U+0055;
  font-display: swap;
}
@font-face {
  font-family: "Yinit";
  font-style: normal;
  font-weight: 400;
  src: url("Yinit-V.ttf") format("truetype");
  unicode-range: U+0056;
  font-display: swap;
}
@font-face {
  font-family: "Yinit";
  font-style: normal;
  font-weight: 400;
  src: url("Yinit-W.ttf") format("truetype");
  unicode-range: U+0057;
  font-display: swap;
}
@font-face {
  font-family: "Yinit";
  font-style: normal;
  font-weight: 400;
  src: url("Yinit-X.ttf") format("truetype");
  unicode-range: U+0058;
  font-display: swap;
}
@font-face {
  font-family: "Yinit";
  font-style: normal;
  font-weight: 400;
  src: url("Yinit-Y.ttf") format("truetype");
  unicode-range: U+0059;
  font-display: swap;
}
@font-face {
  font-family: "Yinit";
  font-style: normal;
  font-weight: 400;
  src: url("Yinit-Z.ttf") format("truetype");
  unicode-range: U+005A;
  font-display: swap;
}