/* Design tokens only: colours, fonts, sizes. Modelled on Notion's palette: white page, warm grey sidebar,
   near-black text, one blue accent, and soft tinted tags for everything else. */

:root {
  color-scheme: light;

  --bg: #ffffff;
  --bg-sidebar: #f7f7f5;
  --bg-soft: #f7f6f3;                      /* code blocks, callouts */
  --bg-hover: rgba(55, 53, 47, 0.06);
  --bg-active: rgba(55, 53, 47, 0.09);

  --ink: #37352f;
  --muted: rgba(55, 53, 47, 0.7);
  --faint: rgba(55, 53, 47, 0.45);
  --line: rgba(55, 53, 47, 0.09);
  --line-strong: rgba(55, 53, 47, 0.17);

  --accent: #2383e2;
  --accent-hover: #0077d4;
  --accent-soft: rgba(35, 131, 226, 0.12);

  --inline-code: #d44c47;
  --inline-code-bg: rgba(135, 131, 120, 0.15);
  --syn-kw: #9065b0;
  --syn-str: #448361;
  --syn-com: #9b9a97;
  --syn-num: #d9730d;

  /* Notion's tag colours */
  --tag-gray-bg: #e3e2e0;   --tag-gray-fg: #32302c;
  --tag-brown-bg: #eee0da;  --tag-brown-fg: #442a1e;
  --tag-orange-bg: #fadec9; --tag-orange-fg: #49290e;
  --tag-yellow-bg: #fdecc8; --tag-yellow-fg: #402c1b;
  --tag-green-bg: #dbeddb;  --tag-green-fg: #1c3829;
  --tag-blue-bg: #d3e5ef;   --tag-blue-fg: #183347;
  --tag-purple-bg: #e8deee; --tag-purple-fg: #412454;
  --tag-pink-bg: #f5e0e9;   --tag-pink-fg: #4c2337;
  --tag-red-bg: #ffe2dd;    --tag-red-fg: #5d1715;

  --bad: #e03e3e;
  --ok: #0f7b6c;

  /* difficulty colours for bars and dots */
  --c-easy: #0f7b6c;
  --c-med: #dfab01;
  --c-hard: #e03e3e;

  --font-body: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --radius: 4px;
  --sidebar-w: 248px;
  --topbar-h: 44px;
  --shadow-pop: 0 0 0 1px rgba(15, 15, 15, 0.05), 0 3px 6px rgba(15, 15, 15, 0.1), 0 9px 24px rgba(15, 15, 15, 0.2);
  --shadow-card: 0 1px 2px rgba(15, 15, 15, 0.06), 0 4px 12px rgba(15, 15, 15, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;

    --bg: #191919;
    --bg-sidebar: #202020;
    --bg-soft: #252525;
    --bg-hover: rgba(255, 255, 255, 0.055);
    --bg-active: rgba(255, 255, 255, 0.09);

    --ink: rgba(255, 255, 255, 0.81);
    --muted: rgba(255, 255, 255, 0.55);
    --faint: rgba(255, 255, 255, 0.36);
    --line: rgba(255, 255, 255, 0.094);
    --line-strong: rgba(255, 255, 255, 0.17);

    --accent: #3b93ea;
    --accent-hover: #5aa5f0;
    --accent-soft: rgba(59, 147, 234, 0.18);

    --inline-code: #ff7369;
    --inline-code-bg: rgba(135, 131, 120, 0.25);
    --syn-kw: #c297d9;
    --syn-str: #6bc08a;
    --syn-com: #7f7f7f;
    --syn-num: #ffa344;

    --tag-gray-bg: #454b4e;   --tag-gray-fg: #ececec;
    --tag-brown-bg: #603b2c;  --tag-brown-fg: #ececec;
    --tag-orange-bg: #854c1d; --tag-orange-fg: #ececec;
    --tag-yellow-bg: #89632a; --tag-yellow-fg: #ececec;
    --tag-green-bg: #2b593f;  --tag-green-fg: #ececec;
    --tag-blue-bg: #28456c;   --tag-blue-fg: #ececec;
    --tag-purple-bg: #492f64; --tag-purple-fg: #ececec;
    --tag-pink-bg: #69314c;   --tag-pink-fg: #ececec;
    --tag-red-bg: #6e3630;    --tag-red-fg: #ececec;

    --bad: #ff7369;
    --ok: #4dab9a;
    --c-easy: #4dab9a;
    --c-med: #e3a73a;
    --c-hard: #ff7369;
    --shadow-pop: 0 0 0 1px rgba(255, 255, 255, 0.08), 0 3px 6px rgba(0, 0, 0, 0.4), 0 9px 24px rgba(0, 0, 0, 0.5);
    --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.3), 0 4px 12px rgba(0, 0, 0, 0.4);
  }
}

/* Each topic group gets one tag colour. */
.g-found { --gt-bg: var(--tag-blue-bg); --gt-fg: var(--tag-blue-fg); }
.g-struct { --gt-bg: var(--tag-green-bg); --gt-fg: var(--tag-green-fg); }
.g-search { --gt-bg: var(--tag-orange-bg); --gt-fg: var(--tag-orange-fg); }
.g-dp { --gt-bg: var(--tag-purple-bg); --gt-fg: var(--tag-purple-fg); }
.g-misc { --gt-bg: var(--tag-pink-bg); --gt-fg: var(--tag-pink-fg); }