/* ============================================================
   engram — Design Tokens
   Extracted from semantic-bridge-v3.pptx (Dr. Benjamin Mörzinger,
   27. Industriebauseminar, TU Wien, 29.05.2026).

   Aesthetic: scholarly, restrained, warm. A dark academic notebook
   on cream paper, lit by a single lamp. Rust accents, sage and
   slate domain hues, serif body, monospace meta.
   ============================================================ */

@import url("https://fonts.googleapis.com/css2?family=Source+Serif+4:ital,opsz,wght@0,8..60,300..700;1,8..60,300..700&family=JetBrains+Mono:wght@400;500;600&family=Inter:wght@400;500;600;700&display=swap");

:root {
  /* ----- Surfaces (dark, the canonical background) ----- */
  --bg:          #1A1A1A;   /* slide / app background */
  --bg-raised:  #2A2826;   /* cards, log panels */
  --bg-sunken:  #14110F;   /* code blocks, terminals */
  --hairline:   #3A3632;   /* dividers, faint borders */

  /* ----- Surfaces (light counterpart — "paper" mode) ----- */
  --paper:       #F7F3EE;   /* cream paper, hero light variant */
  --paper-2:     #ECE6DD;   /* second paper tone, hover on paper */
  --paper-ink:   #2A2826;   /* ink on paper */

  /* ----- Foreground (ink) on dark ----- */
  --fg:         #F7F3EE;   /* primary text */
  --fg-2:       #9B9590;   /* secondary text, italics, captions */
  --fg-3:       #6B6560;   /* tertiary, mono meta, footnotes */
  --fg-4:       #3A3632;   /* on-dark hairline / disabled */

  /* ----- Brand accent (dusty rose / muted pink) ----- */
  --accent:     #C75B72;   /* primary accent, underlines, links */
  --accent-soft:#F5D2DB;   /* soft pink highlight, callouts */
  --accent-ink: #5C2334;   /* deep wine for text-on-soft */

  /* ----- Domain colors (used for ontology / data-source tags) ----- */
  --sage:       #A7BEAE;   /* gebäude / building */
  --slate:      #6B9BAB;   /* data / wetter / api */
  --mauve:      #8B7BAB;   /* simulation / ai */
  --forest:     #3D5C44;   /* energy / grid */

  /* ----- Semantic ----- */
  --success:    #3D5C44;
  --warning:    #C75B72;
  --info:       #6B9BAB;

  /* ----- Type stacks ----- */
  --font-serif: "Source Serif 4", Georgia, "Iowan Old Style", "Apple Garamond", serif;
  --font-mono:  "JetBrains Mono", Consolas, "SF Mono", Menlo, monospace;
  --font-sans:  "Inter", -apple-system, "Segoe UI", system-ui, sans-serif;

  /* ----- Type scale (1280×720 / 1920×1080 friendly) ----- */
  --t-display:  88px;   /* hero numbers (100M+, 80%, 58%) */
  --t-h1:       44px;   /* slide headlines */
  --t-h2:       32px;   /* section titles */
  --t-h3:       22px;   /* card titles */
  --t-body:     18px;   /* body */
  --t-small:    15px;   /* secondary */
  --t-meta:     12px;   /* mono meta, eyebrows */
  --t-micro:    10px;

  /* ----- Spacing (4px base) ----- */
  --s-1:  4px;
  --s-2:  8px;
  --s-3:  12px;
  --s-4:  16px;
  --s-5:  24px;
  --s-6:  32px;
  --s-7:  48px;
  --s-8:  64px;
  --s-9:  96px;
  --s-10:128px;

  /* ----- Radii (mostly square; small radius for chips/cards) ----- */
  --r-0: 0;
  --r-1: 2px;
  --r-2: 4px;
  --r-3: 8px;
  --r-pill: 999px;

  /* ----- Borders ----- */
  --border:        1px solid var(--hairline);
  --border-strong: 1px solid var(--fg-3);
  --border-accent: 2px solid var(--accent);

  /* ----- Shadows (minimal — this brand prefers borders + tone) ----- */
  --shadow-1: 0 1px 0 rgba(0,0,0,0.4);
  --shadow-2: 0 2px 8px rgba(0,0,0,0.5);
  --shadow-3: 0 8px 28px rgba(0,0,0,0.55);

  /* ----- Motion ----- */
  --ease:        cubic-bezier(.2,.7,.2,1);
  --dur-fast:    120ms;
  --dur:         220ms;
  --dur-slow:    420ms;
}

/* ============================================================
   Base reset + body type on dark canvas
   ============================================================ */

html, body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-serif);
  font-size: var(--t-body);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* ============================================================
   Semantic type roles
   ============================================================ */

.eyebrow,
.kicker {
  font-family: var(--font-mono);
  font-size: var(--t-meta);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--fg-3);
}

.display {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: var(--t-display);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--fg);
}

h1, .h1 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: var(--t-h1);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--fg);
  margin: 0;
}

h2, .h2 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: var(--t-h2);
  line-height: 1.2;
  letter-spacing: -0.005em;
  color: var(--fg);
  margin: 0;
}

h3, .h3 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: var(--t-h3);
  line-height: 1.3;
  color: var(--fg);
  margin: 0;
}

p, .body {
  font-family: var(--font-serif);
  font-size: var(--t-body);
  line-height: 1.55;
  color: var(--fg);
  margin: 0;
}

.lede {
  font-family: var(--font-serif);
  font-size: 22px;
  font-style: italic;
  line-height: 1.5;
  color: var(--fg-2);
}

.small {
  font-size: var(--t-small);
  color: var(--fg-2);
}

.meta,
.mono {
  font-family: var(--font-mono);
  font-size: var(--t-meta);
  letter-spacing: 0.02em;
  color: var(--fg-3);
}

code, pre, kbd, .code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  color: var(--fg);
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  transition: opacity var(--dur) var(--ease);
}
a:hover { opacity: 0.7; }

hr, .rule {
  border: 0;
  border-top: 1px solid var(--hairline);
  margin: var(--s-5) 0;
}

.accent-rule {
  height: 2px;
  width: 56px;
  background: var(--accent);
  border: 0;
}

/* ============================================================
   Utility classes
   ============================================================ */

.paper { background: var(--paper); color: var(--paper-ink); }
.paper .meta, .paper .eyebrow { color: #6B6560; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  font-family: var(--font-mono);
  font-size: var(--t-meta);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--fg-2);
  padding: 4px 8px;
  border: 1px solid var(--hairline);
  border-radius: var(--r-1);
}

.tag--sage   { color: var(--sage);   border-color: color-mix(in oklab, var(--sage) 40%, transparent); }
.tag--slate  { color: var(--slate);  border-color: color-mix(in oklab, var(--slate) 40%, transparent); }
.tag--mauve  { color: var(--mauve);  border-color: color-mix(in oklab, var(--mauve) 40%, transparent); }
.tag--forest { color: var(--sage);   border-color: color-mix(in oklab, var(--forest) 60%, transparent); background: color-mix(in oklab, var(--forest) 18%, transparent); }
.tag--accent { color: var(--accent); border-color: color-mix(in oklab, var(--accent) 50%, transparent); }