/* Parquet study-guide modernization overlay
   Layered ON TOP of the existing study guide CSS — adds:
   - Dark mode support (paper turns slate, ink turns near-white)
   - Inter typography refresh
   - A back-to-library top bar
   - A theme toggle floating in the top-right
*/
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  --sg-bg-app: #ecead9;        /* spread background outside the page */
  --sg-paper: #faf8f2;
  --sg-paper-2: #f3efe4;
  --sg-ink: #141414;
  --sg-ink-2: #2a2a2a;
  --sg-mute: #6b6b66;
  --sg-line: #d9d6ce;
  --sg-line-2: #e8e5dc;
}

[data-theme="dark"] {
  --sg-bg-app: #0e1117;
  --sg-paper: #1a1f2b;
  --sg-paper-2: #232936;
  --sg-ink: #e8eaf0;
  --sg-ink-2: #c4c8d3;
  --sg-mute: #8d94a3;
  --sg-line: #2a3142;
  --sg-line-2: #232936;
}

/* Override the original tokens */
html[data-theme] body {
  background: var(--sg-bg-app) !important;
  font-family: 'Inter', system-ui, sans-serif;
  font-feature-settings: "ss01", "cv11", "tnum";
}

html[data-theme] .page {
  background: var(--sg-paper) !important;
  color: var(--sg-ink) !important;
  box-shadow: 0 6px 32px rgba(0,0,0,.18), 0 2px 8px rgba(0,0,0,.10) !important;
}

html[data-theme="dark"] .page {
  box-shadow: 0 8px 36px rgba(0,0,0,.5), 0 2px 8px rgba(0,0,0,.3) !important;
}

/* Re-route every place the original CSS used --paper / --ink / --line so the
   inner content reads correctly. We do this by overriding the original CSS
   custom properties at :root level. */
html[data-theme] {
  --ink: var(--sg-ink);
  --ink-2: var(--sg-ink-2);
  --mute: var(--sg-mute);
  --line: var(--sg-line);
  --line-2: var(--sg-line-2);
  --paper: var(--sg-paper);
  --paper-2: var(--sg-paper-2);
}

/* Sticky top toolbar above the print pages */
.sg-toolbar {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 24px;
  background: color-mix(in oklab, var(--sg-bg-app) 88%, transparent);
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  border-bottom: 1px solid color-mix(in oklab, var(--sg-ink) 12%, transparent);
  font-family: 'Inter', system-ui, sans-serif;
}
.sg-toolbar .left { display: flex; align-items: center; gap: 14px; }
.sg-toolbar a.back, .sg-toolbar a.brand-link {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 500;
  color: var(--sg-ink); text-decoration: none;
  padding: 7px 14px; border-radius: 999px;
  transition: background 120ms ease;
}
.sg-toolbar a.back { color: var(--sg-mute); }
.sg-toolbar a.back:hover { background: color-mix(in oklab, var(--sg-ink) 8%, transparent); color: var(--sg-ink); }
.sg-toolbar a.brand-link {
  font-weight: 700;
  letter-spacing: -0.01em;
  padding: 7px 10px;
}
.sg-toolbar a.brand-link em {
  font-style: normal;
  color: var(--accent-color, oklch(0.55 0.15 30));
  margin-right: 0;
}
.sg-toolbar a.brand-link:hover { background: color-mix(in oklab, var(--sg-ink) 8%, transparent); }
.sg-toolbar .right { display: flex; align-items: center; gap: 10px; }
.sg-toolbar .meta {
  font-family: 'JetBrains Mono', monospace; font-size: 11px;
  color: var(--sg-mute); letter-spacing: 0.04em;
}
.sg-toolbar button.print {
  display: inline-flex; align-items: center; gap: 6px;
  background: transparent; border: 1px solid color-mix(in oklab, var(--sg-ink) 18%, transparent);
  color: var(--sg-ink); padding: 7px 13px; font-size: 12px; font-weight: 500;
  border-radius: 999px; cursor: pointer; font-family: inherit;
  transition: all 120ms ease;
}
.sg-toolbar button.print:hover { background: color-mix(in oklab, var(--sg-ink) 8%, transparent); }
.sg-toolbar button.print svg { width: 13px; height: 13px; }

/* The theme toggle, floating */
.sg-theme-toggle {
  background: color-mix(in oklab, var(--sg-paper) 60%, transparent);
  border: 1px solid color-mix(in oklab, var(--sg-ink) 14%, transparent);
  width: 56px; height: 30px;
  border-radius: 999px;
  cursor: pointer; padding: 3px; position: relative;
  display: inline-flex; align-items: center;
  transition: background 200ms ease;
}
.sg-theme-toggle .knob {
  width: 24px; height: 24px;
  background: var(--sg-paper);
  box-shadow: 0 1px 3px rgba(0,0,0,.18);
  border-radius: 50%;
  display: grid; place-items: center;
  color: var(--sg-ink);
  transition: transform 280ms cubic-bezier(.22,1,.36,1), background 200ms ease;
}
[data-theme="dark"] .sg-theme-toggle .knob { transform: translateX(26px); }
.sg-theme-toggle .knob svg { width: 14px; height: 14px; }
.sg-theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .sg-theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .sg-theme-toggle .icon-moon { display: block; }

@media print {
  .sg-toolbar { display: none !important; }
  body { background: white !important; }
}