/* =============================================================
   Plato University · Colors & Type
   Sourced from ctwhome/plato-university (index.html @theme + daisyUI overrides).
   Consume these tokens from any HTML artifact in this system.
   ============================================================= */

/* ---------- Fonts (via Google Fonts) --------------------------
   Loaded from CDN by each HTML file. If you need to host locally,
   drop .woff2 files in fonts/ and re-declare the @font-face rules.
   -------------------------------------------------------------- */
/* No webfonts. Brand uses system-installed fonts only:
   Serif: Georgia (ships on macOS, Windows, iOS, Android via fallback).
   Sans:  -apple-system / Segoe UI / Roboto (native UI stack per OS).
   This keeps the system zero-dependency and offline-safe. */

:root {
  /* ---------- Brand palette --------------------------------- */
  --cream:       #faf7f2;  /* page background, on-dark text      */
  --cream-2:     #f2ede3;  /* subtle surface, card alt bg        */
  --cream-3:     #e8e0d0;  /* base-300, dividers, pressed        */
  --ink:         #1a1a1a;  /* primary text, dark surface         */
  --olive:       #6b7a4f;  /* primary accent, italic marks       */
  --terracotta:  #b8593a;  /* secondary/danger accent, highlights*/

  /* ---------- Foreground on cream --------------------------- */
  --fg-1: var(--ink);                        /* body, headings   */
  --fg-2: color-mix(in oklab, var(--ink) 85%, transparent);  /* body text/prose */
  --fg-3: color-mix(in oklab, var(--ink) 70%, transparent);  /* secondary copy  */
  --fg-4: color-mix(in oklab, var(--ink) 55%, transparent);  /* tertiary / meta */
  --fg-5: color-mix(in oklab, var(--ink) 35%, transparent);  /* disabled / dim  */

  /* ---------- Foreground on ink ----------------------------- */
  --fg-inv-1: var(--cream);
  --fg-inv-2: color-mix(in oklab, var(--cream) 70%, transparent);
  --fg-inv-3: color-mix(in oklab, var(--cream) 50%, transparent);

  /* ---------- Semantic color roles -------------------------- */
  --bg:            var(--cream);
  --bg-sunk:       var(--cream-2);
  --bg-sunk-2:     #e8e0d0;
  --bg-inverse:    var(--ink);
  --primary:       var(--olive);
  --primary-fg:    var(--cream);
  --secondary:     var(--terracotta);
  --secondary-fg:  var(--cream);
  --accent:        var(--terracotta);
  --success:       var(--olive);
  --warning:       var(--terracotta);
  --error:         var(--terracotta);
  --info:          var(--olive);
  --rule:          color-mix(in oklab, var(--ink) 18%, transparent);
  --rule-soft:     color-mix(in oklab, var(--ink) 10%, transparent);
  --rule-softer:   color-mix(in oklab, var(--ink) 6%,  transparent);
  --highlight:     rgba(255, 210, 80, 0.48);  /* scroll sweep */

  /* ---------- Font families --------------------------------- */
  --font-serif:   Georgia, "Iowan Old Style", "Palatino Linotype", "Book Antiqua", "Times New Roman", ui-serif, serif;
  --font-sans:    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, ui-sans-serif, system-ui, sans-serif;
  --font-mono:    ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Courier New", monospace;

  /* ---------- Type scale ------------------------------------
     A serif-led editorial scale. Display and headings use
     Cormorant Garamond; UI and prose use Inter.                 */
  --fs-display-1: clamp(3.25rem, 7vw + 1rem, 6rem);   /* hero H1 */
  --fs-display-2: clamp(2.5rem, 5.5vw + 1rem, 4.5rem);/* section H1 */
  --fs-h1: clamp(2.25rem, 3.5vw + 1rem, 3rem);
  --fs-h2: clamp(1.75rem, 2.25vw + 1rem, 2.25rem);
  --fs-h3: clamp(1.375rem, 1.5vw + 1rem, 1.625rem);
  --fs-h4: 1.25rem;
  --fs-lead: clamp(1.25rem, 0.8vw + 1rem, 1.5rem);
  --fs-body: 1rem;
  --fs-sm:   0.875rem;
  --fs-xs:   0.75rem;
  --fs-eyebrow: 0.75rem;                                /* uppercase meta */

  --lh-tight: 1.02;
  --lh-heading: 1.1;
  --lh-snug: 1.25;
  --lh-body: 1.55;
  --lh-relaxed: 1.7;

  --tracking-eyebrow: 0.2em;
  --tracking-tight: -0.01em;
  --tracking-normal: 0;

  /* ---------- Radii / spacing / shadow ---------------------- */
  --radius-selector: 0.25rem;  /* checkbox, small chips          */
  --radius-field:    0.25rem;  /* inputs, buttons                */
  --radius-box:      0.5rem;   /* cards, sheets                  */
  --radius-lg:       1rem;     /* featured cards                 */
  --radius-xl:       1.5rem;   /* the "problem" card             */
  --radius-pill:     9999px;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;
  --space-10: 8rem;

  --shadow-sm:   0 1px 2px rgba(26,26,26,0.06);
  --shadow-card: 0 4px 40px rgba(26,26,26,0.08), 0 1px 4px rgba(26,26,26,0.04);
  --shadow-tip:  0 4px 20px rgba(26,26,26,0.13), 0 1px 4px rgba(26,26,26,0.08);

  /* ---------- Motion ---------------------------------------- */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --dur-fast: 120ms;
  --dur-base: 180ms;
  --dur-slow: 280ms;
}

/* ---------- Global typographic defaults ---------------------- */
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  color: var(--fg-1);
  background: var(--bg);
  font-feature-settings: "ss01", "cv11";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Convenience classes for the two type stacks */
.font-serif { font-family: var(--font-serif); font-feature-settings: "liga", "dlig"; }
.font-sans  { font-family: var(--font-sans); }
.font-mono  { font-family: var(--font-mono); }

/* ---------- Semantic type roles ------------------------------ */
h1, .h1 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: var(--fs-h1);
  line-height: var(--lh-heading);
  letter-spacing: var(--tracking-tight);
  color: var(--fg-1);
}
h2, .h2 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: var(--fs-h2);
  line-height: var(--lh-heading);
  letter-spacing: var(--tracking-tight);
}
h3, .h3 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: var(--fs-h3);
  line-height: var(--lh-snug);
}
h4, .h4 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: var(--fs-h4);
  line-height: var(--lh-snug);
}

.display-1 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: var(--fs-display-1);
  line-height: var(--lh-tight);
  letter-spacing: var(--tracking-tight);
}
.display-2 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: var(--fs-display-2);
  line-height: var(--lh-tight);
  letter-spacing: var(--tracking-tight);
}

.lead {
  font-family: var(--font-serif);
  font-size: var(--fs-lead);
  line-height: var(--lh-snug);
  color: var(--fg-2);
}

p, .body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--fg-2);
}

.prose-serif {
  font-family: var(--font-serif);
  font-size: var(--fs-lead);
  line-height: var(--lh-relaxed);
  color: var(--fg-2);
}

.eyebrow {
  font-family: var(--font-sans);
  font-size: var(--fs-eyebrow);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--tracking-eyebrow);
  color: var(--olive);
}
.eyebrow--terracotta { color: var(--terracotta); }

.italic-accent {
  font-style: italic;
  color: var(--olive);
}
.terracotta-accent {
  color: var(--terracotta);
  font-style: italic;
}

code, .code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--cream-2);
  padding: 0.1em 0.35em;
  border-radius: var(--radius-selector);
}

/* ---------- Focus ring (terracotta) ------------------------- */
:focus-visible {
  outline: 2px solid var(--terracotta);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- Divider rule ------------------------------------ */
.rule {
  height: 1px;
  background: var(--rule);
  width: 100%;
}
.rule--soft { background: var(--rule-soft); }

/* ---------- Annotated term (dotted underline) --------------- */
.annotated {
  text-decoration: underline;
  text-decoration-style: dotted;
  text-decoration-color: var(--terracotta);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 3px;
  cursor: help;
  white-space: nowrap;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}