/* cohort site styles - shared across /, /analysis.html, /about.html */

:root {
  --bg: #0f0f12;
  --bg-elevated: #1a1a1f;
  --border: #2e2e35;
  --text: #f5f5f5;
  --text-secondary: #a1a1aa;
  --accent: #06b6d4;
  --accent-hover: #22d3ee;
  --complement: #f97316;

  --nav-height: 56px;
  --nav-help-height: 44px;

  --font-body: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Fira Code", Consolas, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }

h1, h2, h3 { font-weight: 600; line-height: 1.2; }
h1 { font-size: clamp(36px, 5vw, 56px); }
h2 { font-size: clamp(24px, 3vw, 32px); margin-bottom: 16px; }
h3 { font-size: clamp(18px, 2vw, 22px); margin-bottom: 12px; }

p { margin: 12px 0; }

code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: var(--bg-elevated);
  padding: 2px 6px;
  border-radius: 4px;
}

pre {
  font-family: var(--font-mono);
  background: var(--bg-elevated);
  padding: 16px;
  border-radius: 6px;
  overflow-x: auto;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ======================= */
/*  NAV                    */
/* ======================= */

.site-nav {
  border-bottom: 1px solid var(--border);
  height: var(--nav-height);
  position: sticky;
  top: 0;
  background: rgba(15, 15, 18, 0.92);
  backdrop-filter: blur(8px);
  z-index: 10;
}

.site-nav__inner {
  display: flex;
  align-items: center;
  max-width: 1000px;
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  gap: 20px;
}

.site-nav__brand {
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
}

.site-nav__stats {
  display: flex;
  gap: 16px;
  font-size: 13px;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}

.site-nav__stats strong {
  color: var(--accent);
  font-weight: 600;
}

.site-nav__links {
  display: flex;
  gap: 24px;
  margin-left: auto;
}

.site-nav__links a {
  color: var(--text-secondary);
  font-size: 14px;
}

.site-nav__links a:hover,
.site-nav__links a.active {
  color: var(--text);
}

@media (max-width: 720px) {
  .site-nav__stats { display: none; }
}

/* ======================= */
/*  HERO PAGE (index)      */
/* ======================= */

.hero-page {
  min-height: calc(100vh - var(--nav-height));
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 40px 0;
}

.hero {
  text-align: center;
  margin-bottom: 56px;
}

.hero__tagline {
  font-size: 22px;
  color: var(--text-secondary);
  margin-top: 16px;
}

.hero__intro {
  max-width: 620px;
  margin: 24px auto 0;
  color: var(--text-secondary);
  font-size: 16px;
}

/* ======================= */
/*  CARDS / GRIDS          */
/* ======================= */

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  transition: border-color 0.15s, transform 0.15s;
}

.card-link {
  display: block;
  color: var(--text);
}

.card-link:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.card__title {
  font-size: 17px;
  font-weight: 600;
  color: var(--accent);
}

.card__desc {
  color: var(--text-secondary);
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.5;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

@media (max-width: 980px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: 1fr; }
}

/* ======================= */
/*  ANALYSIS PAGE          */
/* ======================= */

.lead {
  color: var(--text-secondary);
  font-size: 17px;
  margin-top: 16px;
  max-width: 720px;
}

.chart {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 24px auto;
  border-radius: 6px;
  background: var(--bg-elevated);
}

.chart--wide {
  width: 100%;
}

.callout {
  background: var(--bg-elevated);
  border-left: 3px solid var(--accent);
  border-radius: 4px;
  padding: 14px 18px;
  margin: 20px 0;
  font-size: 15px;
  color: var(--text-secondary);
}

.callout strong { color: var(--text); }

.key-result {
  background: rgba(6, 182, 212, 0.06);
  border: 1px solid var(--accent);
  border-radius: 8px;
  padding: 18px 22px;
  margin: 24px 0;
}

.key-result__label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}

.key-result__body {
  color: var(--text);
  font-size: 15px;
  line-height: 1.65;
}

.data-points {
  list-style: none;
  padding: 0;
  margin: 16px 0;
}

.data-points li {
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-secondary);
}

.data-points li:last-child { border-bottom: none; }
.data-points li strong { color: var(--text); }
.data-points li .meta {
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 400;
}

.ecosystem-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  font-size: 13px;
}

.ecosystem-card__share {
  font-size: 24px;
  font-weight: 700;
  color: var(--accent);
}

.ecosystem-card__meta {
  color: var(--text-secondary);
  font-size: 12px;
  margin-top: 2px;
}

.ecosystem-card__apps {
  margin-top: 12px;
  color: var(--text);
  line-height: 1.5;
}

.ecosystem-card--accent { border-color: var(--accent); }
.ecosystem-card--accent .ecosystem-card__share { color: var(--accent); }
.ecosystem-card--complement { border-color: var(--complement); }
.ecosystem-card--complement .ecosystem-card__share { color: var(--complement); }

.kv-row {
  display: flex;
  gap: 16px;
  align-items: baseline;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}

.kv-row:last-child { border-bottom: none; }

.kv-row__key {
  color: var(--text-secondary);
  min-width: 160px;
  font-family: var(--font-mono);
  font-size: 13px;
}

.kv-row__val { color: var(--text); }

/* ======================= */
/*  SECTIONS (about page)  */
/* ======================= */

.section { padding: 48px 0; }
.section + .section { border-top: 1px solid var(--border); }

/* about: in-page TOC */
.toc {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 20px;
  margin-top: 32px;
  font-size: 14px;
}

.toc a {
  margin-right: 18px;
  display: inline-block;
  color: var(--text-secondary);
  padding: 2px 0;
}

.toc a:hover { color: var(--accent); }

.notation {
  width: 100%;
  margin-top: 16px;
  border-collapse: collapse;
}

.notation td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
}

.notation td:first-child {
  font-family: var(--font-mono);
  width: 1%;
  white-space: nowrap;
  color: var(--accent);
}

/* matrix examples on the about page (movies, shows-x-apps) */
.matrix-example {
  margin: 28px auto;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}

.matrix-example th,
.matrix-example td {
  padding: 10px 18px;
  text-align: center;
  border: 1px solid var(--border);
}

.matrix-example thead th {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 14px;
  background: var(--bg-elevated);
}

.matrix-example tbody th {
  text-align: right;
  color: var(--text-secondary);
  font-weight: 500;
  background: var(--bg-elevated);
}

.matrix-example td.unknown {
  color: var(--complement);
  font-weight: 700;
}

/* ======================= */
/*  ANALYSIS PAGE (slides) */
/* ======================= */

.slides-frame {
  height: calc(100vh - var(--nav-height) - var(--nav-help-height));
  position: relative;
  background: var(--bg);
}

.nav-help {
  height: var(--nav-help-height);
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  color: var(--text-secondary);
  font-size: 13px;
  padding: 0 24px;
}

.nav-help kbd {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text);
  margin: 0 2px;
}

@media (max-width: 720px) {
  .nav-help { gap: 16px; font-size: 11px; }
}

.slides-frame iframe {
  width: 100%;
  height: 100%;
  border: none;
  background: var(--bg);
  display: block;
}

.slides-fullscreen {
  position: absolute;
  top: 12px;
  right: 12px;
  background: var(--bg-elevated);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 12px;
  cursor: pointer;
  z-index: 5;
  transition: border-color 0.15s, color 0.15s;
}

.slides-fullscreen:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ======================= */
/*  FOOTER (index, about)  */
/* ======================= */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  color: var(--text-secondary);
  font-size: 13px;
  text-align: center;
}