/* Code Intelligence Digest — architecture site.
   Design tokens mirror sjarmak.ai (the "warm archival atlas" system):
   OKLCH palette, Literata display + Hanken Grotesk body, warm ember accent. */

@font-face {
  font-family: "Literata";
  src: url("./fonts/literata-latin-wght-normal.woff2") format("woff2-variations");
  font-weight: 200 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Literata";
  src: url("./fonts/literata-latin-wght-italic.woff2") format("woff2-variations");
  font-weight: 200 900;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: "Hanken Grotesk";
  src: url("./fonts/hanken-grotesk-latin-wght-normal.woff2") format("woff2-variations");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

:root {
  /* paper / ink / ember primitives */
  --paper-50: oklch(98.5% 0.008 85);
  --paper-100: oklch(96.5% 0.012 83);
  --paper-200: oklch(93.5% 0.014 82);
  --paper-300: oklch(88% 0.016 80);
  --ink-900: oklch(23% 0.02 60);
  --ink-700: oklch(38% 0.018 62);
  --ink-500: oklch(52% 0.015 64);
  --ember-500: oklch(60% 0.16 52);
  --ember-600: oklch(53% 0.165 48);

  /* semantic tokens (light / paper) */
  --color-bg: var(--paper-100);
  --color-surface: var(--paper-200);
  --color-subtle: var(--paper-50);
  --color-text: var(--ink-900);
  --color-text-secondary: var(--ink-700);
  --color-text-muted: var(--ink-500);
  --color-border: var(--paper-300);
  --color-accent: var(--ember-500);
  --color-accent-hover: var(--ember-600);
  --color-selection: oklch(82% 0.1 60);
  --color-tag-bg: var(--paper-200);

  /* delivery-state hues (match spec.c4 tags) */
  --tag-built: #16a34a;
  --tag-evolving: #d97706;
  --tag-planned: #64748b;
  --tag-research: #6366f1;
  --tag-risk: #dc2626;

  /* type scale (fluid) */
  --step--1: clamp(0.83rem, 0.8rem + 0.15vw, 0.9rem);
  --step-0: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --step-1: clamp(1.25rem, 1.15rem + 0.5vw, 1.5rem);
  --step-2: clamp(1.56rem, 1.4rem + 0.8vw, 2rem);
  --step-3: clamp(1.95rem, 1.7rem + 1.25vw, 2.75rem);
  --step-4: clamp(2.44rem, 2rem + 2vw, 3.75rem);

  /* spacing */
  --space-2xs: 0.5rem;
  --space-xs: 0.75rem;
  --space-s: 1rem;
  --space-m: 1.5rem;
  --space-l: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --space-3xl: 9rem;

  --container: 72rem;
  --container-narrow: 46rem;
  --measure: 68ch;
  --radius-s: 0.25rem;
  --radius: 0.5rem;
  --radius-l: 1rem;
  --border-hairline: 1px solid var(--color-border);
  --color-focus: var(--ember-500);
}

[data-theme="dark"] {
  --color-bg: oklch(20% 0.012 70);
  --color-surface: oklch(24% 0.013 72);
  --color-subtle: oklch(24% 0.013 72);
  --color-text: oklch(92% 0.015 85);
  --color-text-secondary: oklch(77% 0.013 80);
  --color-text-muted: oklch(65% 0.012 78);
  --color-border: oklch(31% 0.014 72);
  --color-accent: oklch(74% 0.15 58);
  --color-accent-hover: oklch(80% 0.14 60);
  --color-selection: oklch(40% 0.1 55);
  --color-tag-bg: oklch(28% 0.013 72);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  margin: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: "Hanken Grotesk", system-ui, sans-serif;
  font-size: var(--step-0);
  font-weight: 400;
  line-height: 1.6;
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s ease, color 0.3s ease;
}

::selection {
  background-color: var(--color-selection);
  color: var(--ink-900);
}

h1,
h2,
h3,
h4 {
  font-family: "Literata", Georgia, serif;
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.02em;
  text-wrap: balance;
  margin: 0;
}
h1 { font-size: var(--step-4); }
h2 { font-size: var(--step-3); }
h3 { font-size: var(--step-2); }
h4 { font-size: var(--step-1); }

p { margin: 0; }

a {
  color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  text-decoration-color: color-mix(in oklch, var(--color-accent) 45%, transparent);
  transition: color 0.15s ease, text-decoration-color 0.15s ease;
}
a:hover {
  color: var(--color-accent-hover);
  text-decoration-color: currentColor;
}

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: var(--radius-s);
}

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1rem, 5vw, 4rem);
}

.kicker {
  font-family: "Hanken Grotesk", sans-serif;
  font-size: var(--step--1);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin: 0 0 var(--space-2xs);
}

.lead {
  font-size: var(--step-1);
  line-height: 1.28;
  color: var(--color-text-secondary);
  max-width: var(--measure);
}

.muted { color: var(--color-text-muted); }

/* ── header ───────────────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: color-mix(in oklch, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: var(--border-hairline);
}
.site-header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-m);
  min-height: 4rem;
}
.site-header__brand {
  font-family: "Literata", serif;
  font-weight: 600;
  font-size: var(--step-1);
  letter-spacing: -0.02em;
  color: var(--color-text);
  text-decoration: none;
  white-space: nowrap;
  margin-right: auto;
}
.site-header__nav {
  display: flex;
  gap: var(--space-m);
  align-items: center;
}
.site-header__nav a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--step-0);
}
.site-header__nav a:hover { color: var(--color-text); }
.theme-toggle {
  inline-size: 2.25rem;
  block-size: 2.25rem;
  display: inline-grid;
  place-items: center;
  border-radius: var(--radius);
  border: var(--border-hairline);
  background: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.theme-toggle:hover { color: var(--color-accent); border-color: var(--color-accent); }
.theme-toggle svg { width: 1.1rem; height: 1.1rem; }
[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }
.theme-toggle .icon-sun { display: block; }
.theme-toggle .icon-moon { display: none; }

@media (max-width: 46rem) {
  .site-header__nav .nav-extra { display: none; }
}

/* ── hero ─────────────────────────────────────────────────────────────── */
.hero {
  padding-block: clamp(var(--space-l), 7vw, var(--space-2xl)) var(--space-l);
}
.hero h1 { margin-bottom: var(--space-m); max-width: 20ch; }
.hero .lead { margin-bottom: var(--space-l); }
.cluster {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-s);
  align-items: center;
}
.btn {
  display: inline-block;
  padding: 0.7em 1.3em;
  border-radius: var(--radius);
  background: var(--color-accent);
  color: var(--paper-50);
  font-weight: 600;
  text-decoration: none;
  border: 2px solid var(--color-accent);
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}
.btn:hover { background: var(--color-accent-hover); border-color: var(--color-accent-hover); color: var(--paper-50); transform: translateY(-1px); }
.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn--ghost:hover { background: transparent; color: var(--color-accent); border-color: var(--color-accent); }

/* delivery-state legend */
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-m);
  margin-top: var(--space-l);
  padding-top: var(--space-m);
  border-top: var(--border-hairline);
  font-size: var(--step--1);
}
.legend span { display: inline-flex; align-items: center; gap: 0.45em; color: var(--color-text-secondary); }
.swatch { width: 0.8em; height: 0.8em; border-radius: 50%; display: inline-block; }

/* ── sections ─────────────────────────────────────────────────────────── */
.section { padding-block: clamp(var(--space-xl), 8vw, var(--space-2xl)); border-top: var(--border-hairline); }
.section__head { max-width: var(--measure); margin-bottom: var(--space-l); }
.section__head h2 { margin-bottom: var(--space-s); }

.auto-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(24rem, 100%), 1fr));
  gap: var(--space-l);
}

/* figure card */
figure.diagram {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-s);
  padding: var(--space-m);
  border: var(--border-hairline);
  border-radius: var(--radius-l);
  background: var(--color-subtle);
  transition: border-color 0.15s ease;
}
figure.diagram:hover { border-color: color-mix(in oklch, var(--color-accent) 40%, var(--color-border)); }
figure.diagram .frame {
  display: block;
  border-radius: var(--radius);
  overflow: hidden;
  border: var(--border-hairline);
  background: var(--color-bg);
}
figure.diagram img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 32rem;
  object-fit: contain;
}
figure.diagram figcaption h3 { font-size: var(--step-1); margin-bottom: 0.3em; }
figure.diagram figcaption p { color: var(--color-text-secondary); font-size: var(--step-0); }
.fig-title { display: flex; align-items: baseline; gap: 0.6em; flex-wrap: wrap; }
.fig-id { font-family: ui-monospace, "SFMono-Regular", monospace; font-size: var(--step--1); color: var(--color-text-muted); }

/* full-width figure (landscape / deployment) */
figure.diagram.wide { grid-column: 1 / -1; }
figure.diagram.wide img { max-height: 44rem; }

.tag {
  display: inline-block;
  font-size: var(--step--1);
  font-family: ui-monospace, "SFMono-Regular", monospace;
  padding: 0.15em 0.6em;
  border-radius: var(--radius-s);
  background: var(--color-tag-bg);
  color: var(--color-text-secondary);
  border: var(--border-hairline);
}

/* ── footer ───────────────────────────────────────────────────────────── */
.site-footer {
  margin-block-start: var(--space-2xl);
  border-top: var(--border-hairline);
  padding-block: var(--space-l);
  font-size: var(--step--1);
}
.site-footer ul { list-style: none; display: flex; flex-wrap: wrap; gap: var(--space-l); margin: 0; padding: 0; }
.site-footer a { color: var(--color-accent); }

.skip-link {
  position: absolute;
  left: -999px;
}
.skip-link:focus { left: var(--space-s); top: var(--space-s); background: var(--color-surface); padding: var(--space-2xs) var(--space-s); border-radius: var(--radius); z-index: 100; }