/* ==========================================================================
   Strategic Deep Dive Shared Stylesheet
   ========================================================================== */

:root {
  --header-height: 70px;
  --paper: #F6F5F1;
  --surface: #FFFFFF;
  --ink: #14161A;
  --muted: #4A5568;
  --rule: #DED9CD;
  --grid: #E7E2D6;
  --faint: #8A9099;
  --gold: #A8801F;
  --blue: #2C63B5;
  --r1: #C9A840;
  --r2: #9C7618;
  --r3: #5A470D;
  --shadow: 0 1px 2px rgba(20,22,26,.05), 0 8px 24px rgba(20,22,26,.05);
  --modelbg: #F8F9FB;
  --sans: 'BF Modernista', 'Futura', 'Avenir Next', 'Helvetica Neue', Arial, sans-serif;
  --serif: 'BF Modernista', 'Futura', 'Avenir Next', 'Helvetica Neue', Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, 'Liberation Mono', monospace;
}

@media (max-width: 900px) {
  :root {
    --header-height: 69px;
  }
}

@media (max-width: 480px) {
  :root {
    --header-height: 66px;
  }
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme= light]) {
    --paper: #14161A;
    --surface: #1B1E23;
    --ink: #EFEDE6;
    --muted: #A8AEB8;
    --rule: #2C3037;
    --grid: #262A30;
    --faint: #767D88;
    --gold: #B08722;
    --blue: #3E7FCC;
    --r1: #5A470D;
    --r2: #9C7618;
    --r3: #C9A840;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.25);
    --modelbg: #1B1E23;
  }
}

:root[data-theme=dark] {
  --paper: #14161A;
  --surface: #1B1E23;
  --ink: #EFEDE6;
  --muted: #A8AEB8;
  --rule: #2C3037;
  --grid: #262A30;
  --faint: #767D88;
  --gold: #B08722;
  --blue: #3E7FCC;
  --r1: #5A470D;
  --r2: #9C7618;
  --r3: #C9A840;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.25);
  --modelbg: #1B1E23;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, section, article {
  scroll-margin-top: var(--header-height);
}

.wrap {
  max-width: 920px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

/* Back Link */
.back-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  min-width: 44px;
  padding: 8px 0;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--muted);
  text-decoration: none;
  margin-bottom: 24px;
  transition: color 0.2s ease;
}

.back-link:hover,
.back-link:focus-visible {
  color: var(--gold);
}

.back-link:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 4px;
}

/* Deck Embed (16:9 ratio) */
.deck-embed {
  position: relative;
  width: 100%;
  max-width: 960px;
  margin: 24px auto;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: 8px;
  background: #000;
  box-shadow: var(--shadow);
}

.deck-embed iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}