/* House style: the tokens and base of marklundeberg.com (src/css/style.css), with a dark mode added.
   Copy this file into a page, or link it. README.md says what each token is for. */

:root {
  --ground: #f8f8f4;      /* behind the card */
  --card: #fffffa;        /* the page itself */
  --ink: #333;            /* text */
  --muted: #666;          /* captions, axis labels */
  --rule: #e6e6e0;        /* the one rule under the title, table lines */
  --link: #0077cc;        /* links: the only colour without a physics job */
  --shadow: 0 2px 8px rgb(0 0 0 / 0.05);

  /* Physics colours, from ESBD's figureDefs.js (the canonical list lives there).
     Signed things everywhere: warm is positive, blue is negative. */
  --neg: #377eb8;         /* electron, spin down, cold, negative charge */
  --pos: #e4571a;         /* hole, spin up, hot, positive charge */
  --cation: #e41a1c;      /* a generic cation (ESBD: Li+) */
  --anion: #80b030;       /* a generic anion (ESBD: Cl-) */
  --electron: var(--neg); --hole: var(--pos);
  --li: #e41a1c; --na: #d87e37; --k: #b84e63; --cl: #80b030;   /* ESBD SPECIES; add others from figureDefs.js as needed */
  --hot: #93690a; --cold: #6a4fb5;   /* temperature: the ends of inferno (yellow hot, violet cold), clear of every species hue */

  --text-font: system-ui, -apple-system, 'Segoe UI', Roboto, Ubuntu, sans-serif;
  --mono-font: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ground: #15171a; --card: #1c1f23; --ink: #e4e4e0; --muted: #9a9a95; --rule: #33363b;
    --link: #5aa9e6; --shadow: none;
    --neg: #5b9bd5; --pos: #f07a45; --cation: #f0484a; --anion: #9ccc50;
    --li: #f0484a; --na: #eb9a5a; --k: #d6728a; --cl: #9ccc50; --hot: #f2c440; --cold: #a48be0;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --ground: #15171a; --card: #1c1f23; --ink: #e4e4e0; --muted: #9a9a95; --rule: #33363b;
  --link: #5aa9e6; --shadow: none;
  --neg: #5b9bd5; --pos: #f07a45; --cation: #f0484a; --anion: #9ccc50;
  --li: #f0484a; --na: #eb9a5a; --k: #d6728a; --cl: #9ccc50; --hot: #f2c440; --cold: #a48be0;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
body {
  margin: 0; background: var(--ground); color: var(--ink);
  font: 1rem/1.6 var(--text-font);
}
a { color: var(--link); }

/* The page: one card, a reading column; figures may run wider than the text. */
.house-top, .house-foot { max-width: 75ch; margin: 0 auto; padding: 0.6em 16px; font-size: 0.85em; color: var(--muted); }
.house-top a, .house-foot a { color: inherit; }
main {
  max-width: 75ch; margin: 0 auto; padding: 1em 0 1.5em;
  background: var(--card); box-shadow: var(--shadow); border-radius: 4px;
}
main > * { margin-left: 16px; margin-right: 16px; }
@media (min-width: 640px) { main > * { margin-left: 2rem; margin-right: 2rem; } }   /* rem, so headings line up with the text */
h1 { text-align: center; font-size: 2em; line-height: 1.2; margin-top: 0.6em; padding-bottom: 0.4em; border-bottom: 1px solid var(--rule); }
h2 { font-size: 1.4em; line-height: 1.25; margin-top: 1.6em; }
h1, h2, h3 { font-weight: 700; }
figure { margin-top: 1.2em; margin-bottom: 1.2em; }
figcaption { font-size: 0.9em; color: var(--muted); margin-top: 0.4em; }
code, .num { font-family: var(--mono-font); font-size: 0.92em; }
.num { font-variant-numeric: tabular-nums; }

/* Controls: native inputs, coloured by the quantity they change (set --q on the element). */
.controls { display: flex; flex-wrap: wrap; gap: 0.4em 1.4em; align-items: center; font-size: 0.95em; }
.controls label { display: inline-flex; align-items: center; gap: 0.5em; }
input[type="range"], input[type="checkbox"], input[type="radio"] { accent-color: var(--q, var(--link)); }
button { font: inherit; color: var(--ink); background: var(--card); border: 1px solid var(--rule); border-radius: 4px; padding: 0.25em 0.8em; cursor: pointer; }
button:hover { border-color: var(--link); }
canvas, svg { max-width: 100%; display: block; }