/* ==========================================================================
   General Intelligence Company — Design System & Stylesheet
   Theme: Light | Literary journal beside a bonfire
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,300..600;1,9..144,300..600&family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  /* Colors */
  --color-parchment: #fefffc;
  --color-paper: #ffffff;
  --color-linen: #f9faf7;
  --color-ink-black: #171717;
  --color-graphite: #2c2c2c;
  --color-charcoal: #444141;
  --color-ash: #646464;
  --color-fog: #b4b8b4;
  --color-mist: #dee2de;
  --color-twilight: #282834;
  --color-dusk: #1f1f29;
  --color-signal-blue: #41a1cf;
  --color-cerulean: #0081c0;

  /* Typography — Font Families */
  --font-ppmondwest: 'Fraunces', 'ppmondwest', 'Recoleta', 'GT Sectra', Georgia, serif;
  --font-af: 'Inter', 'af', 'Geist', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* Typography — Scale */
  --text-caption: 13px;
  --leading-caption: 1.3;
  --tracking-caption: -0.13px;

  --text-body-sm: 15px;
  --leading-body-sm: 1.0;
  --tracking-body-sm: -0.15px;

  --text-body: 16px;
  --leading-body: 1.5;
  --tracking-body: -0.16px;

  --text-subheading: 18px;
  --leading-subheading: 1.3;
  --tracking-subheading: -0.18px;

  --text-heading-sm: 27px;
  --leading-heading-sm: 1.5;
  --tracking-heading-sm: -1.08px;

  --text-heading: 40px;
  --leading-heading: 1.1;
  --tracking-heading: -0.8px;

  --text-heading-lg: 48px;
  --leading-heading-lg: 1.1;
  --tracking-heading-lg: -0.96px;

  --text-display: 54px;
  --leading-display: 1.1;
  --tracking-display: -1.08px;

  /* Typography — Weights */
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Spacing */
  --spacing-4: 4px;
  --spacing-8: 8px;
  --spacing-12: 12px;
  --spacing-16: 16px;
  --spacing-20: 20px;
  --spacing-24: 24px;
  --spacing-32: 32px;
  --spacing-40: 40px;
  --spacing-48: 48px;
  --spacing-64: 64px;
  --spacing-80: 80px;

  /* Layout */
  --page-max-width: 1200px;
  --section-gap: 64px;
  --card-padding: 16px;
  --element-gap: 12px;

  /* Border Radii */
  --radius-sm: 4px;
  --radius-btn: 8px;
  --radius-card: 12px;
  --radius-card-lg: 16px;
  --radius-surface: 24px;
  --radius-pill: 50px;

  /* Elevation Shadows */
  --shadow-sm: rgba(0, 0, 0, 0.15) 0px 2px 6px 0px;
  --shadow-subtle: rgba(0, 0, 0, 0.08) 0px 1px 1px 0px, rgba(0, 0, 0, 0.08) 0px 4px 5px 0px;
  --shadow-subtle-2: rgb(222, 226, 222) 0px 0px 0px 1px;
  --shadow-subtle-3: rgba(0, 0, 0, 0.06) 0px 2px 2px 0px, rgba(0, 0, 0, 0.04) 0px 0px 0px 5px;
  --shadow-sm-2: rgba(0, 0, 0, 0.05) 0px 1px 8px 0px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--color-parchment);
  color: var(--color-charcoal);
  font-family: var(--font-af);
  font-size: var(--text-body);
  line-height: var(--leading-body);
  letter-spacing: -0.012em;
  overflow-x: hidden;
  position: relative;
}

/* Selection */
::selection {
  background-color: #e4edf4;
  color: var(--color-twilight);
}

/* Typography Classes */
h1, h2, h3, h4, .serif-heading {
  font-family: var(--font-ppmondwest);
  font-weight: 400 !important; /* Strict design rule: always 400 for serif */
  color: var(--color-graphite);
  font-feature-settings: "liga" 0;
}

.text-display {
  font-size: var(--text-display);
  line-height: var(--leading-display);
  letter-spacing: var(--tracking-display);
}

.text-heading-lg {
  font-size: var(--text-heading-lg);
  line-height: var(--leading-heading-lg);
  letter-spacing: var(--tracking-heading-lg);
}

.text-heading {
  font-size: var(--text-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
}

.text-heading-sm {
  font-size: var(--text-heading-sm);
  line-height: var(--leading-heading-sm);
  letter-spacing: var(--tracking-heading-sm);
}

.text-subheading {
  font-size: var(--text-subheading);
  line-height: var(--leading-subheading);
  letter-spacing: var(--tracking-subheading);
  font-weight: 500;
}

.text-body-sm {
  font-size: var(--text-body-sm);
  line-height: var(--leading-body-sm);
  letter-spacing: var(--tracking-body-sm);
}

.text-caption {
  font-size: var(--text-caption);
  line-height: var(--leading-caption);
  letter-spacing: var(--tracking-caption);
  color: var(--color-ash);
}

p {
  color: var(--color-charcoal);
  line-height: 1.5;
  font-size: 16px;
  letter-spacing: -0.012em;
}

/* Layout Utilities */
.container {
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
  position: relative;
}

/* ==========================================================================
   Components
   ========================================================================== */

/* 1. Frosted Navigation Pill */
.nav-pill-wrapper {
  position: fixed;
  top: 24px;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  justify-content: center;
  pointer-events: none;
  transition: transform 0.3s ease;
}

.nav-pill {
  pointer-events: auto;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-twilight);
  box-shadow: var(--shadow-sm);
  padding: 6px 10px 6px 16px;
  display: flex;
  align-items: center;
  gap: 20px;
  transition: background 0.2s, box-shadow 0.2s;
}

.nav-pill:hover {
  background: rgba(255, 255, 255, 0.92);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--color-graphite);
  font-family: var(--font-af);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: -0.01em;
}

.nav-brand svg {
  color: var(--color-graphite);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  list-style: none;
}

.nav-link {
  text-decoration: none;
  color: var(--color-charcoal);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.01em;
  transition: color 0.15s ease;
}

.nav-link:hover {
  color: var(--color-twilight);
}

/* Navigation CTA */
.nav-cta {
  text-decoration: none;
  border-radius: var(--radius-btn);
  border: 1px solid var(--color-signal-blue);
  color: var(--color-signal-blue);
  font-size: 14px;
  font-weight: 500;
  padding: 4px 10px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  transition: background-color 0.15s, border-color 0.15s;
}

.nav-cta:hover {
  background-color: rgba(65, 161, 207, 0.08);
}

/* 2. Buttons */
.btn-primary-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: var(--radius-btn);
  background: transparent;
  border: 1px solid var(--color-signal-blue);
  color: var(--color-signal-blue);
  font-family: var(--font-af);
  font-size: 15px;
  font-weight: 500;
  padding: 5px 12px;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s;
}

.btn-primary-outline:hover {
  background-color: rgba(65, 161, 207, 0.08);
}

.btn-primary-outline:active {
  transform: translateY(1px);
}

.btn-icon-circle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 1px solid var(--color-signal-blue);
  font-size: 11px;
}

.btn-secondary-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: var(--radius-btn);
  background: transparent;
  border: 1px solid var(--color-twilight);
  color: var(--color-twilight);
  font-family: var(--font-af);
  font-size: 15px;
  font-weight: 500;
  padding: 5px 12px;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.2s;
}

.btn-secondary-outline:hover {
  background-color: rgba(40, 40, 52, 0.06);
}

.btn-filled-dark {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: var(--radius-btn);
  background-color: var(--color-dusk);
  color: #ffffff;
  border: 1px solid var(--color-twilight);
  font-family: var(--font-af);
  font-size: 15px;
  font-weight: 500;
  padding: 8px 16px;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.2s;
}

.btn-filled-dark:hover {
  background-color: #2b2b3a;
}

.ghost-text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  color: var(--color-charcoal);
  font-family: var(--font-af);
  font-size: 16px;
  font-weight: 400;
  text-decoration: none;
  cursor: pointer;
  transition: color 0.15s;
}

.ghost-text-link:hover {
  color: var(--color-twilight);
}

.ghost-text-link span.arrow {
  transition: transform 0.2s ease;
}

.ghost-text-link:hover span.arrow {
  transform: translateX(4px);
}

/* 3. Hero Section */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: flex-end;
  padding: 48px;
  background-size: cover;
  background-position: center bottom;
  background-repeat: no-repeat;
  overflow: hidden;
}

.hero-overlay-mask {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(20,22,28,0.2) 0%, rgba(20,22,28,0.4) 60%, rgba(20,22,28,0.65) 100%);
  pointer-events: none;
}

.hero-overlay-card {
  position: relative;
  z-index: 2;
  max-width: 640px;
  background: rgba(254, 255, 252, 0.9);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-surface);
  border: 1px solid rgba(255, 255, 255, 0.7);
  box-shadow: var(--shadow-sm);
  padding: 48px;
  margin-bottom: 24px;
}

.hero-tagline {
  font-family: var(--font-af);
  font-size: var(--text-body-sm);
  font-weight: 500;
  color: var(--color-ash);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.hero-title {
  font-size: var(--text-display);
  line-height: var(--leading-display);
  letter-spacing: var(--tracking-display);
  color: var(--color-ink-black);
  margin-bottom: 16px;
}

.hero-description {
  font-size: var(--text-subheading);
  line-height: var(--leading-subheading);
  letter-spacing: var(--tracking-subheading);
  color: var(--color-charcoal);
  margin-bottom: 28px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

/* 4. The 4K Video Section */
.video-feature-section {
  background-color: var(--color-parchment);
  padding: 96px 0;
}

.section-header-editorial {
  margin-bottom: 40px;
}

.section-eyebrow {
  font-family: var(--font-af);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-ash);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}

.section-title {
  font-size: var(--text-heading-lg);
  line-height: var(--leading-heading-lg);
  letter-spacing: var(--tracking-heading-lg);
  color: var(--color-graphite);
  margin-bottom: 12px;
}

.section-lead {
  font-size: var(--text-subheading);
  line-height: 1.5;
  color: var(--color-ash);
  max-width: 720px;
}

/* Custom 4K Video Player Container */
.video-player-container {
  background: #0d0f12;
  border-radius: var(--radius-surface);
  border: 1px solid var(--color-mist);
  overflow: hidden;
  box-shadow: 0 16px 40px -10px rgba(0,0,0,0.18);
  position: relative;
  transition: all 0.3s ease;
}

.video-player-container.theater-mode {
  max-width: 100vw;
  border-radius: 0;
}

.video-screen-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background-color: #050608;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.video-screen-wrapper video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* 4K Cinematic Badges */
.video-badge-4k {
  position: absolute;
  top: 20px;
  right: 20px;
  background: rgba(15, 17, 23, 0.85);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 6px;
  padding: 4px 10px;
  display: flex;
  align-items: center;
  gap: 6px;
  color: #ffffff;
  font-family: var(--font-af);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  z-index: 5;
  pointer-events: none;
}

.video-badge-4k .dot {
  width: 6px;
  height: 6px;
  background-color: #41a1cf;
  border-radius: 50%;
  box-shadow: 0 0 8px #41a1cf;
}

/* Custom Subtitles Overlay */
.video-subtitles-overlay {
  position: absolute;
  bottom: 84px;
  left: 50%;
  transform: translateX(-50%);
  max-width: 80%;
  text-align: center;
  color: #fefffc;
  font-family: var(--font-ppmondwest);
  font-size: 22px;
  line-height: 1.35;
  text-shadow: 0 2px 8px rgba(0,0,0,0.85);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.25s ease;
  z-index: 6;
  background: rgba(15, 17, 23, 0.65);
  backdrop-filter: blur(8px);
  padding: 8px 20px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.12);
}

.video-subtitles-overlay.active {
  opacity: 1;
}

/* Big Play Overlay Button */
.big-play-btn {
  position: absolute;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: rgba(254, 255, 252, 0.88);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-ink-black);
  cursor: pointer;
  transition: transform 0.2s, background 0.2s, opacity 0.2s;
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
  z-index: 8;
}

.big-play-btn:hover {
  transform: scale(1.08);
  background: #ffffff;
}

.big-play-btn svg {
  margin-left: 3px;
}

/* Player Controls Bar */
.video-controls-bar {
  background: rgba(26, 28, 35, 0.96);
  padding: 12px 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  flex-direction: column;
  gap: 10px;
  user-select: none;
}

/* Scrubber / Progress Bar */
.scrubber-track-container {
  position: relative;
  width: 100%;
  height: 16px;
  display: flex;
  align-items: center;
  cursor: pointer;
}

.scrubber-track {
  width: 100%;
  height: 5px;
  background: rgba(255, 255, 255, 0.16);
  border-radius: 3px;
  position: relative;
  overflow: visible;
  transition: height 0.15s ease;
}

.scrubber-track-container:hover .scrubber-track {
  height: 8px;
}

.scrubber-progress {
  height: 100%;
  background: var(--color-signal-blue);
  border-radius: 3px;
  width: 0%;
  position: relative;
}

.scrubber-handle {
  position: absolute;
  right: -6px;
  top: 50%;
  transform: translateY(-50%) scale(0);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #ffffff;
  box-shadow: 0 1px 4px rgba(0,0,0,0.4);
  transition: transform 0.15s ease;
}

.scrubber-track-container:hover .scrubber-handle {
  transform: translateY(-50%) scale(1);
}

/* Scrubber Chapter Markers */
.scrubber-marker {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 2px;
  background: rgba(255, 255, 255, 0.55);
  pointer-events: none;
}

.scrubber-marker::after {
  content: '';
  position: absolute;
  top: -4px;
  left: -2px;
  width: 6px;
  height: 4px;
  background: #dee2de;
  border-radius: 1px;
}

/* Hover time tooltip */
.scrubber-tooltip {
  position: absolute;
  top: -34px;
  left: 0;
  transform: translateX(-50%);
  background: rgba(20, 20, 24, 0.9);
  color: #ffffff;
  font-size: 11px;
  padding: 3px 6px;
  border-radius: 4px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s;
  white-space: nowrap;
}

/* Control Buttons Row */
.controls-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #dee2de;
  font-family: var(--font-af);
  font-size: 14px;
}

.controls-left, .controls-right {
  display: flex;
  align-items: center;
  gap: 14px;
}

.ctrl-btn {
  background: transparent;
  border: none;
  color: #dee2de;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px;
  border-radius: 4px;
  transition: color 0.15s, background-color 0.15s;
}

.ctrl-btn:hover {
  color: #ffffff;
  background-color: rgba(255, 255, 255, 0.08);
}

.time-display {
  font-family: var(--font-af);
  font-size: 13px;
  color: #b4b8b4;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.time-display .current-time {
  color: #ffffff;
  font-weight: 500;
}

/* Volume Slider */
.volume-container {
  display: flex;
  align-items: center;
  gap: 6px;
}

.volume-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 70px;
  height: 4px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.volume-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #ffffff;
  cursor: pointer;
}

/* Resolution & Speed Selectors */
.quality-badge-select, .speed-select {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  color: #ffffff;
  font-family: var(--font-af);
  font-size: 12px;
  font-weight: 500;
  border-radius: 4px;
  padding: 3px 8px;
  cursor: pointer;
  outline: none;
}

.quality-badge-select option, .speed-select option {
  background: #1f1f29;
  color: #ffffff;
}

/* Interactive Chapter Navigation Bar */
.video-chapters-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
  margin-top: 24px;
}

.chapter-card-btn {
  background: var(--color-paper);
  border: 1px solid var(--color-mist);
  border-radius: var(--radius-card);
  padding: 14px 16px;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.chapter-card-btn:hover {
  border-color: var(--color-signal-blue);
  box-shadow: var(--shadow-sm-2);
}

.chapter-card-btn.active {
  border-color: var(--color-signal-blue);
  background: #f4f9fc;
}

.chapter-card-btn.active::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-signal-blue);
  border-top-left-radius: var(--radius-card);
  border-top-right-radius: var(--radius-card);
}

.chapter-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.chapter-num {
  font-family: var(--font-af);
  font-size: 12px;
  font-weight: 600;
  color: var(--color-ash);
  text-transform: uppercase;
}

.chapter-time {
  font-family: var(--font-af);
  font-size: 12px;
  color: var(--color-signal-blue);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

.chapter-title {
  font-family: var(--font-ppmondwest);
  font-size: 16px;
  line-height: 1.25;
  color: var(--color-graphite);
}

/* 5. Synchronized Literary Transcript Accordion / Viewer */
.transcript-panel {
  margin-top: 32px;
  background: var(--color-paper);
  border: 1px solid var(--color-mist);
  border-radius: var(--radius-card-lg);
  padding: 32px;
  box-shadow: var(--shadow-subtle);
}

.transcript-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--color-mist);
  padding-bottom: 16px;
  margin-bottom: 24px;
}

.transcript-items-flow {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.transcript-entry {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 20px;
  padding: 12px 16px;
  border-radius: 8px;
  transition: background-color 0.2s, border-color 0.2s;
  cursor: pointer;
}

.transcript-entry:hover {
  background-color: var(--color-linen);
}

.transcript-entry.active {
  background-color: #f1f8fc;
  border-left: 3px solid var(--color-signal-blue);
}

.transcript-timestamp {
  font-family: var(--font-af);
  font-size: 13px;
  font-weight: 500;
  color: var(--color-ash);
  font-variant-numeric: tabular-nums;
}

.transcript-entry.active .transcript-timestamp {
  color: var(--color-signal-blue);
  font-weight: 600;
}

.transcript-text {
  font-family: var(--font-ppmondwest);
  font-size: 18px;
  line-height: 1.5;
  color: var(--color-charcoal);
}

.transcript-entry.active .transcript-text {
  color: var(--color-ink-black);
}

/* 6. Content Cards Grid */
.cards-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.white-content-card {
  background: var(--color-paper);
  border: 1px solid var(--color-mist);
  border-radius: var(--radius-card);
  padding: 24px;
  box-shadow: var(--shadow-subtle);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.2s, box-shadow 0.2s;
}

.white-content-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0,0,0,0.06);
}

.card-icon {
  margin-bottom: 16px;
  color: var(--color-twilight);
}

.card-title {
  font-size: var(--text-heading-sm);
  line-height: var(--leading-heading-sm);
  letter-spacing: var(--tracking-heading-sm);
  color: var(--color-graphite);
  margin-bottom: 12px;
}

.card-body {
  font-family: var(--font-af);
  font-size: 15px;
  color: var(--color-charcoal);
  line-height: 1.5;
  margin-bottom: 20px;
}

/* 7. Two-Column Diagram Section */
.diagram-split-section {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: 48px;
  align-items: center;
  padding: 80px 0;
}

.diagram-card {
  background: var(--color-paper);
  border: 1px solid var(--color-mist);
  border-radius: var(--radius-card-lg);
  box-shadow: var(--shadow-sm-2);
  padding: 24px;
  position: relative;
}

.diagram-svg-wrapper {
  width: 100%;
  border-radius: 12px;
  background: #fbfcf9;
  border: 1px solid var(--color-mist);
  padding: 24px;
  display: flex;
  justify-content: center;
}

.diagram-caption {
  font-family: var(--font-af);
  font-size: var(--text-caption);
  color: var(--color-ash);
  margin-top: 12px;
  line-height: 1.4;
  border-left: 2px solid var(--color-mist);
  padding-left: 10px;
}

/* 8. Singular Cerulean Atmospheric Card */
.cerulean-accent-section {
  padding: 64px 0;
}

.cerulean-card {
  background-color: var(--color-cerulean);
  color: #ffffff;
  border-radius: var(--radius-surface);
  padding: 80px 64px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.cerulean-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255,255,255,0.15) 0%, rgba(255,255,255,0) 70%);
  pointer-events: none;
}

.cerulean-title {
  font-family: var(--font-ppmondwest);
  font-size: var(--text-heading-lg);
  line-height: var(--leading-heading-lg);
  letter-spacing: var(--tracking-heading-lg);
  color: #ffffff;
  margin-bottom: 20px;
  max-width: 720px;
}

.cerulean-text {
  font-family: var(--font-af);
  font-size: var(--text-subheading);
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.9);
  max-width: 680px;
  margin-bottom: 32px;
}

.cerulean-btn-white {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: var(--radius-btn);
  background: #ffffff;
  color: var(--color-twilight);
  border: none;
  font-family: var(--font-af);
  font-size: 15px;
  font-weight: 500;
  padding: 8px 18px;
  text-decoration: none;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
  transition: background-color 0.15s, transform 0.15s;
}

.cerulean-btn-white:hover {
  background: #f2f5f7;
  transform: translateY(-1px);
}

/* 9. Pixel Flower Contrast Section */
.pixel-contrast-section {
  padding: 80px 0;
  background-color: var(--color-linen);
  border-top: 1px solid var(--color-mist);
  border-bottom: 1px solid var(--color-mist);
}

.pixel-contrast-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.pixel-frame {
  background: var(--color-paper);
  border: 1px solid var(--color-mist);
  border-radius: var(--radius-surface);
  padding: 40px;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: var(--shadow-subtle);
}

.pixel-frame img {
  max-width: 280px;
  image-rendering: pixelated;
  border-radius: 8px;
}

/* 10. Form / Paper Input Field */
.dispatch-section {
  padding: 80px 0;
}

.dispatch-container {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
}

.paper-input-group {
  display: flex;
  margin-top: 32px;
  gap: 16px;
  align-items: flex-end;
}

.paper-input {
  flex: 1;
  background-color: var(--color-linen);
  border: none;
  border-bottom: 1px solid var(--color-charcoal);
  border-radius: 0;
  padding: 12px 14px;
  color: var(--color-charcoal);
  font-family: var(--font-af);
  font-size: 16px;
  outline: none;
  transition: border-color 0.2s;
}

.paper-input:focus {
  border-bottom: 1.5px solid var(--color-twilight);
  background-color: #f4f6f1;
}

.paper-input::placeholder {
  color: var(--color-ash);
}

/* 11. Colophon Footer */
.colophon-footer {
  background-color: var(--color-paper);
  border-top: 1px solid var(--color-mist);
  padding: 96px 0 48px 0;
}

.colophon-statement {
  font-family: var(--font-ppmondwest);
  font-size: var(--text-heading-lg);
  line-height: var(--leading-heading-lg);
  letter-spacing: var(--tracking-heading-lg);
  color: var(--color-graphite);
  margin-bottom: 48px;
  max-width: 860px;
}

.colophon-meta-row {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
  border-top: 1px solid var(--color-mist);
  padding-top: 40px;
  margin-bottom: 48px;
}

.colophon-col-title {
  font-family: var(--font-af);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-ash);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.colophon-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.colophon-list a {
  text-decoration: none;
  color: var(--color-charcoal);
  font-size: 14px;
  transition: color 0.15s;
}

.colophon-list a:hover {
  color: var(--color-signal-blue);
}

.colophon-bottom-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--color-mist);
  padding-top: 24px;
  font-family: var(--font-af);
  font-size: 13px;
  color: var(--color-ash);
}

/* 12. Cookie Consent Banner */
.cookie-banner {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 999;
  background: var(--color-paper);
  border: 1px solid var(--color-mist);
  border-radius: var(--radius-btn);
  box-shadow: var(--shadow-sm);
  padding: 12px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--font-af);
  font-size: var(--text-caption);
  color: var(--color-charcoal);
  max-width: 440px;
  transform: translateY(0);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.cookie-banner.hidden {
  transform: translateY(100px);
  opacity: 0;
  pointer-events: none;
}

.cookie-divider {
  width: 1px;
  height: 16px;
  background-color: var(--color-mist);
}

.cookie-btn {
  background: none;
  border: none;
  color: var(--color-twilight);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  padding: 2px 4px;
  transition: color 0.15s;
}

.cookie-btn:hover {
  color: var(--color-signal-blue);
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 1024px) {
  .cards-grid-3 {
    grid-template-columns: 1fr;
  }
  .diagram-split-section {
    grid-template-columns: 1fr;
  }
  .video-chapters-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .colophon-meta-row {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --text-display: 38px;
    --text-heading-lg: 34px;
    --text-heading: 30px;
  }
  .hero-section {
    padding: 24px 16px;
  }
  .hero-overlay-card {
    padding: 28px 20px;
  }
  .video-chapters-grid {
    grid-template-columns: 1fr;
  }
  .pixel-contrast-grid {
    grid-template-columns: 1fr;
  }
  .colophon-meta-row {
    grid-template-columns: 1fr;
  }
  .paper-input-group {
    flex-direction: column;
    align-items: stretch;
  }
  .cookie-banner {
    left: 16px;
    right: 16px;
    bottom: 16px;
    max-width: none;
  }
}