/* ============================================
   ZENITH DESIGN TOKENS
   ============================================ */
:root {
  --bg: #1A1816;
  --surface: #22201D;
  --surface-hover: #2D2A26;
  --border: #3D3630;
  --border-subtle: rgba(255,255,255,0.06);
  --text-primary: #E8E2DA;
  --text-secondary: #A69985;
  --text-muted: #73676D;
  --accent: #C8A064;
  --success: #7EC896;
  --error: #D4756A;
  --warning: #D4A054;
  --info: #6BA3BE;
  --purple: #9B7DB8;
  --teal: #6BA3BE;
  --deep-tan: #856B4E;

  /* Typography */
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'Playfair Display', Georgia, serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', monospace;

  /* Spacing */
  --sp-xs: 4px;
  --sp-sm: 8px;
  --sp-md: 16px;
  --sp-lg: 24px;
  --sp-xl: 32px;
  --sp-2xl: 48px;
  --sp-3xl: 64px;
  --sp-4xl: 96px;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  /* Easing */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Agent colors */
  --agent-generator: #C8A064;
  --agent-pragmatist: #6BA3BE;
  --agent-visionary: #9B7DB8;
  --agent-advocate: #7EC896;
  --agent-synthesizer: #D4756A;
}

/* ============================================
   LIGHT MODE
   ============================================ */
html[data-theme="light"] {
  --bg: #F5F2EE;
  --surface: #EBE7E1;
  --surface-hover: #E2DDD6;
  --border: #D1C9BE;
  --border-subtle: rgba(0,0,0,0.06);
  --text-primary: #3D3630;
  --text-secondary: #736B5F;
  --text-muted: #A09790;
  --accent: #A07830;
  --success: #3D8A5A;
  --error: #B8483E;
  --warning: #B08030;
  --info: #3D7A8F;
  --purple: #7B5D9E;
  --teal: #3D7A8F;
  --deep-tan: #A68860;

  --agent-generator: #A07830;
  --agent-pragmatist: #3D7A8F;
  --agent-visionary: #7B5D9E;
  --agent-advocate: #3D8A5A;
  --agent-synthesizer: #B8483E;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --bg: #F5F2EE;
    --surface: #EBE7E1;
    --surface-hover: #E2DDD6;
    --border: #D1C9BE;
    --border-subtle: rgba(0,0,0,0.06);
    --text-primary: #3D3630;
    --text-secondary: #736B5F;
    --text-muted: #A09790;
    --accent: #A07830;
    --success: #3D8A5A;
    --error: #B8483E;
    --warning: #B08030;
    --info: #3D7A8F;
    --purple: #7B5D9E;
    --teal: #3D7A8F;
    --deep-tan: #A68860;

    --agent-generator: #A07830;
    --agent-pragmatist: #3D7A8F;
    --agent-visionary: #7B5D9E;
    --agent-advocate: #3D8A5A;
    --agent-synthesizer: #B8483E;
  }
}


/* ============================================
   RESET & BASE
   ============================================ */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text-secondary);
  line-height: 1.7;
  overflow-x: hidden;
}

::selection {
  background: rgba(200, 160, 100, 0.3);
  color: var(--text-primary);
}

html[data-theme="light"] ::selection {
  background: rgba(160, 120, 48, 0.25);
}

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

strong {
  color: var(--text-primary);
  font-weight: 500;
}

em {
  font-style: italic;
  color: var(--text-primary);
}

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--surface);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  color: var(--accent);
  border: 1px solid var(--border-subtle);
}


/* ============================================
   CUSTOM SCROLLBARS
   ============================================ */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(61, 54, 48, 0.6); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(166, 153, 133, 0.5); }
::-webkit-scrollbar-thumb:active { background: rgba(200, 160, 100, 0.4); }
::-webkit-scrollbar-corner { background: transparent; }
* { scrollbar-width: thin; scrollbar-color: rgba(61, 54, 48, 0.6) transparent; }

html[data-theme="light"] ::-webkit-scrollbar-thumb { background: rgba(209, 201, 190, 0.7); }
html[data-theme="light"] ::-webkit-scrollbar-thumb:hover { background: rgba(160, 120, 48, 0.4); }
html[data-theme="light"] ::-webkit-scrollbar-thumb:active { background: rgba(160, 120, 48, 0.5); }
html[data-theme="light"] * { scrollbar-color: rgba(209, 201, 190, 0.7) transparent; }


/* ============================================
   THEME TOGGLE (overrides from theme-toggle.js)
   ============================================ */
.theme-toggle {
  position: fixed;
  top: var(--sp-lg);
  right: var(--sp-lg);
  z-index: 100;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--surface);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease, border-color 0.2s ease, opacity 0.3s ease;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.theme-toggle:hover {
  background: var(--surface-hover);
  border-color: var(--accent);
  color: var(--accent);
}


/* ============================================
   HERO
   ============================================ */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero__canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 0 var(--sp-lg);
}

.hero__title {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.1;
  color: var(--text-primary);
  margin-bottom: var(--sp-lg);
}

.hero__title-line {
  display: block;
}

.hero__title-line--1 {
  font-size: clamp(2.5rem, 6vw, 5rem);
  letter-spacing: -0.02em;
}

.hero__title-line--2 {
  font-size: clamp(3.5rem, 10vw, 8rem);
  letter-spacing: -0.03em;
}

.hero__title-line--2 em {
  color: var(--accent);
  font-style: italic;
}

.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  margin-bottom: var(--sp-sm);
  font-weight: 300;
  letter-spacing: 0.02em;
}

.hero__byline {
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.hero__scroll-hint {
  position: absolute;
  bottom: var(--sp-2xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-sm);
  color: var(--text-muted);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-family: var(--font-mono);
}

.hero__scroll-dot {
  animation: scrollDotBounce 2s ease-in-out infinite;
}

@keyframes scrollDotBounce {
  0%, 100% { transform: translateY(0); opacity: 1; }
  50% { transform: translateY(6px); opacity: 0.4; }
}


/* ============================================
   PROLOGUE
   ============================================ */
.prologue {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-4xl) var(--sp-lg);
}

.prologue__content {
  max-width: 680px;
  text-align: center;
}

.prologue__line {
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  font-family: var(--font-display);
  color: var(--text-primary);
  line-height: 1.4;
  margin-bottom: var(--sp-lg);
  opacity: 0;
  transform: translateY(20px);
}

.prologue__bridge {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  margin-top: var(--sp-2xl);
  opacity: 0;
  transform: translateY(20px);
}


/* ============================================
   ACT SECTIONS
   ============================================ */
.act {
  padding: var(--sp-4xl) 0;
}

.act__header {
  max-width: 720px;
  margin: 0 auto var(--sp-3xl);
  padding: 0 var(--sp-lg);
  text-align: center;
}

.act__label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: var(--sp-md);
  opacity: 0.8;
}

.act__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 400;
  color: var(--text-primary);
  line-height: 1.2;
  margin-bottom: var(--sp-md);
  letter-spacing: -0.02em;
}

.act__intro {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.act__source {
  display: block;
  margin-top: var(--sp-md);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-style: normal;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

.act__source em {
  font-style: italic;
  color: var(--text-muted);
}


/* ============================================
   SCROLLYTELLING
   ============================================ */
.scrolly {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  position: relative;
}

.scrolly__graphic {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-xl);
}

.scrolly__graphic-inner {
  width: 100%;
  max-width: 560px;
  aspect-ratio: 1;
  position: relative;
}

.scrolly__text {
  padding: 40vh var(--sp-xl) 40vh var(--sp-2xl);
}

.scrolly__step {
  min-height: 50vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--sp-xl) 0;
  opacity: 0.2;
  transition: opacity 0.5s var(--ease-out);
}

.scrolly__step.is-active {
  opacity: 1;
}

.step__label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: var(--sp-sm);
}

.step__title {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  font-weight: 400;
  color: var(--text-primary);
  margin-bottom: var(--sp-md);
  letter-spacing: -0.01em;
}

.step__body {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 420px;
}


/* ============================================
   ARENAS (OpenAI Gym cards)
   ============================================ */
.arenas {
  padding: var(--sp-4xl) var(--sp-lg);
}

.arenas__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--sp-lg);
  max-width: 1000px;
  margin: 0 auto var(--sp-3xl);
}

.arena-card {
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--sp-lg);
  aspect-ratio: 4 / 3;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  position: relative;
  overflow: hidden;
  cursor: default;
  transition: border-color 0.3s ease, transform 0.3s var(--ease-out);
}

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

.arena-card__canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 60%;
  z-index: 0;
}

.arena-card__meta {
  position: relative;
  z-index: 2;
  margin-top: auto;
  padding-top: var(--sp-sm);
}

.arena-card__label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.arena-card__title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--text-primary);
  font-weight: 400;
}

.arena-card--mystery {
  border-color: var(--accent);
  border-style: dashed;
}

.arena-card--mystery .arena-card__title {
  color: var(--accent);
}

.arenas__takeaway {
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
  font-size: 1.0625rem;
  color: var(--text-secondary);
}


/* ============================================
   EMERGENCE TIMELINE (horizontal scroll)
   ============================================ */
.emergence-timeline {
  overflow: hidden;
  position: relative;
}

.emergence-timeline__track {
  display: flex;
  width: max-content;
}

.emergence-phase {
  width: 100vw;
  height: 100vh;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-3xl);
  padding: var(--sp-2xl);
}

.emergence-phase__viz {
  width: 320px;
  height: 320px;
  flex-shrink: 0;
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.emergence-phase__text {
  max-width: 360px;
}

.emergence-phase__label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: var(--sp-sm);
}

.emergence-phase__text h3 {
  font-family: var(--font-display);
  font-size: 1.75rem;
  color: var(--text-primary);
  font-weight: 400;
  margin-bottom: var(--sp-md);
}

.emergence-phase__text p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.emergence__takeaway {
  max-width: 640px;
  margin: var(--sp-3xl) auto 0;
  padding: 0 var(--sp-lg);
  text-align: center;
  font-size: 1.0625rem;
  color: var(--text-secondary);
}


/* ============================================
   DOUBLE DIAMOND
   ============================================ */
.diamond {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 var(--sp-lg);
}

.diamond__viz {
  width: 100%;
  aspect-ratio: 2.5;
  margin-bottom: var(--sp-3xl);
  position: relative;
}

.diamond__annotations {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-lg);
}

.diamond__note {
  text-align: center;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out);
}

.diamond__note.is-visible {
  opacity: 1;
  transform: none;
}

.diamond__note h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--text-primary);
  font-weight: 400;
  margin-bottom: var(--sp-sm);
}

.diamond__note p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--sp-sm);
}

.diamond__role {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 3px 10px;
  border-radius: 100px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: color 0.3s ease, border-color 0.3s ease;
}

.diamond__role[data-role="generator"] { color: var(--agent-generator); border-color: var(--agent-generator); }
.diamond__role[data-role="critics"] { color: var(--agent-pragmatist); border-color: var(--agent-pragmatist); }
.diamond__role[data-role="advocate"] { color: var(--agent-advocate); border-color: var(--agent-advocate); }
.diamond__role[data-role="synthesizer"] { color: var(--agent-synthesizer); border-color: var(--agent-synthesizer); }

.human__takeaway {
  max-width: 640px;
  margin: var(--sp-3xl) auto 0;
  padding: 0 var(--sp-lg);
  text-align: center;
  font-size: 1.0625rem;
  color: var(--text-secondary);
}


/* ============================================
   CLIMAX (orchestration section emphasis)
   ============================================ */
.act--climax .act__title {
  font-size: clamp(2.5rem, 5vw, 4rem);
}


/* ============================================
   TRY IT
   ============================================ */
.try-it {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-4xl) var(--sp-lg);
}

.try-it__content {
  max-width: 780px;
  text-align: center;
}

.try-it__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 400;
  color: var(--text-primary);
  margin-bottom: var(--sp-md);
  letter-spacing: -0.02em;
}

.try-it__intro {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  margin-bottom: var(--sp-xl);
}

.try-it__paths {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-lg);
  margin-top: var(--sp-3xl);
  margin-bottom: var(--sp-3xl);
  text-align: left;
}

.try-it__path {
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--sp-xl);
  position: relative;
}

.try-it__path-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 3px 10px;
  border-radius: 100px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  margin-bottom: var(--sp-md);
}

.try-it__path-badge--easy {
  border-color: var(--accent);
  color: var(--accent);
}

.try-it__path h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--text-primary);
  font-weight: 400;
  margin-bottom: var(--sp-lg);
}

.try-it__steps {
  display: flex;
  flex-direction: column;
  gap: var(--sp-md);
}

.try-it__step {
  display: flex;
  gap: var(--sp-md);
  align-items: flex-start;
}

.try-it__step-num {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.try-it__path-badge--easy ~ h3 ~ .try-it__steps .try-it__step-num,
.try-it__path:first-child .try-it__step-num {
  border-color: var(--accent);
  color: var(--accent);
}

.try-it__step-content p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.try-it__download {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-sm);
  padding: 14px 32px;
  background: var(--accent);
  color: var(--bg);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  transition: transform 0.2s var(--ease-out), box-shadow 0.3s ease;
}

.try-it__download:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(200, 160, 100, 0.25);
  color: var(--bg);
}

.try-it__reqs {
  margin-top: var(--sp-lg);
  font-size: 0.8125rem;
  color: var(--text-muted);
}


/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  padding: var(--sp-4xl) var(--sp-lg);
  text-align: center;
  border-top: 1px solid var(--border-subtle);
}

.site-footer__title {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: var(--sp-sm);
}

.site-footer__credit {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.6;
}


/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 900px) {
  .scrolly {
    grid-template-columns: 1fr;
  }

  .scrolly__graphic {
    position: relative;
    height: 50vh;
    min-height: 360px;
  }

  .scrolly__text {
    padding: var(--sp-xl) var(--sp-lg);
  }

  .scrolly__step {
    min-height: 40vh;
  }

  .diamond__annotations {
    grid-template-columns: repeat(2, 1fr);
  }

  .emergence-phase {
    flex-direction: column;
    gap: var(--sp-lg);
    padding: var(--sp-lg);
  }

  .emergence-phase__viz {
    width: 240px;
    height: 240px;
  }

  .try-it__paths {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .hero__title-line--1 {
    font-size: 2rem;
  }

  .hero__title-line--2 {
    font-size: 3rem;
  }

  .act__header {
    padding: 0 var(--sp-md);
  }

  .scrolly__graphic {
    height: 40vh;
    min-height: 280px;
    padding: var(--sp-md);
  }

  .scrolly__graphic-inner {
    max-width: 100%;
  }

  .diamond__annotations {
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-md);
  }

  .try-it__steps {
    gap: var(--sp-md);
  }

  .arenas__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--sp-md);
  }

  .emergence-phase__viz {
    width: 200px;
    height: 200px;
  }
}

/* Essay Navigation */
.essay-nav {
  max-width: 800px;
  margin: 0 auto;
  padding: 64px 32px 48px;
  display: flex;
  gap: 16px;
}
.essay-nav__link {
  display: block;
  flex: 1;
  padding: 24px 48px;
  background: var(--surface, #22201D);
  border: 1px solid var(--border-subtle, rgba(255,255,255,0.06));
  border-radius: 16px;
  text-decoration: none;
  text-align: right;
  transition: border-color 0.3s cubic-bezier(0.16, 1, 0.3, 1), transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.essay-nav__link--prev { text-align: left; }
.essay-nav__link:hover {
  border-color: var(--accent, #C8A064);
  transform: translateY(-2px);
}
.essay-nav__direction {
  display: block;
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent, #C8A064);
  margin-bottom: 4px;
}
.essay-nav__title {
  display: block;
  font-family: var(--font-display, 'Playfair Display', Georgia, serif);
  font-size: 1.25rem;
  color: var(--text-primary, #E8E2DA);
  margin-bottom: 4px;
}
.essay-nav__desc {
  display: block;
  font-size: 0.875rem;
  color: var(--text-muted, #73676D);
  line-height: 1.5;
}
@media (max-width: 640px) {
  .essay-nav { flex-direction: column; padding: 48px 16px 32px; }
  .essay-nav__link { text-align: left; padding: 20px 24px; }
}