/* =====================================================================
   codegraph ui — design tokens + global primitives

   The engine's paper/ink editorial system (site/src/styles/theme.css),
   as specified in docs/design/codegraph-ui-design-spec.md §2: flat,
   hairline rules, square corners everywhere, no shadows, no gradients,
   sentence case, one oxblood accent, one amber (the "untested" badge).

   Component-specific rules live in each .svelte file's scoped <style>.
   Only tokens, resets and cross-view primitives belong here.
   ===================================================================== */

/* ---------- tokens: light / paper (the bare :root set) ---------- */
:root {
  --paper: #f7f6f2;
  --paper-2: #f1efe8;
  --press: #e8e6dd;
  --press-2: #dedbd0;
  --ink: #16150f;
  --ink-2: #56544a;
  --ink-3: #87847a;
  --ink-4: #b4b1a5;
  --rule: #16150f;
  --rule-soft: #d6d3c8;
  --rule-faint: #e6e3d9;
  --accent: #7a2230;
  --accent-ink: #5e1a25;
  --accent-soft: #f0e3e5;
  --accent-line: #d9b3b9;
  --amber: #8a5a0b;
  --amber-soft: #f3e9d2;

  --sans: 'Archivo Variable', 'Archivo', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  --code-size: 12.5px;
  --code-lh: 20px;

  /* App-shell geometry, shared by the grid and by anything that has to
     offset itself under the bars (sticky rail headers, SVG overlays). */
  --topbar-h: 48px;
  --trailbar-h: 34px;

  color-scheme: light dark;
}

/* ---------- tokens: dark / ink ----------
   Every colour is defined on the bare :root above; these blocks only
   redefine. `:not([data-theme="light"])` lets an explicit light choice
   win over the OS preference. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    --paper: #16150f;
    --paper-2: #1c1a14;
    --press: #23211a;
    --press-2: #2c2a22;
    --ink: #f3f1ea;
    --ink-2: #b8b5a8;
    --ink-3: #87847a;
    --ink-4: #5d5b52;
    --rule: #f3f1ea;
    --rule-soft: #34322a;
    --rule-faint: #26241d;
    --accent: #d48b96;
    --accent-ink: #e5a5ae;
    --accent-soft: #33201f;
    --accent-line: #6b3a42;
    --amber: #d9a94a;
    --amber-soft: #2e2716;
  }
}

:root[data-theme='dark'] {
  --paper: #16150f;
  --paper-2: #1c1a14;
  --press: #23211a;
  --press-2: #2c2a22;
  --ink: #f3f1ea;
  --ink-2: #b8b5a8;
  --ink-3: #87847a;
  --ink-4: #5d5b52;
  --rule: #f3f1ea;
  --rule-soft: #34322a;
  --rule-faint: #26241d;
  --accent: #d48b96;
  --accent-ink: #e5a5ae;
  --accent-soft: #33201f;
  --accent-line: #6b3a42;
  --amber: #d9a94a;
  --amber-soft: #2e2716;
}

/* ---------- reset ---------- */
html,
body {
  height: 100%;
}

body {
  margin: 0;
  /* body always paints --paper: the bars are transparent over it and a
     short view must not reveal the browser's own canvas colour. */
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  /* Square corners are non-negotiable in this system, including on the
     UA-styled controls (input, select, button) we do not restyle. */
  border-radius: 0 !important;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

h1,
h2,
h3 {
  font-weight: 600;
  text-wrap: balance;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- app shell ----------
   Design spec §3.1: top bar 48px / trail bar 34px / main. The grid is on
   index.html's mount host, which App.svelte fills directly (no wrapper — a
   second #app would duplicate the id). */
#app {
  height: 100vh;
  display: grid;
  grid-template-rows: var(--topbar-h) var(--trailbar-h) 1fr;
}

/* ---------- cross-view primitives ---------- */
.mono {
  font-family: var(--mono);
}

.dim {
  color: var(--ink-3);
}

.tnum {
  font-variant-numeric: tabular-nums;
}

/* Empty / not-yet-loaded states. Sentence case, no exclamation marks —
   say what is missing and what to do about it. */
.emptystate {
  padding: 40px;
  max-width: 60ch;
  color: var(--ink-2);
  line-height: 1.5;
}

.emptystate h2 {
  margin: 0 0 8px;
  font-size: 16px;
  color: var(--ink);
}

.emptystate p {
  margin: 0 0 10px;
}

.emptystate code {
  font-family: var(--mono);
  font-size: 12px;
  background: var(--press);
  padding: 1px 4px;
}