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

html, body {
  background-color: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.interactive-wrapper {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0;
  display: flex;
  flex-direction: column;
}

/* Header */
.story-header {
  padding: 2.5rem 1.5rem 1.5rem;
  max-width: 860px;
  margin: 0 auto;
  text-align: center;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-brand);
  margin-bottom: 0.75rem;
}

.headline {
  font-family: var(--font-serif);
  font-size: clamp(1.85rem, 3.5vw, 2.75rem);
  font-weight: 700;
  line-height: 1.18;
  color: var(--color-ink);
  margin-bottom: 1rem;
}

.deck {
  font-size: 1.15rem;
  line-height: 1.55;
  color: var(--color-ink-muted);
  margin-bottom: 1.25rem;
}

.meta-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
  font-size: 0.85rem;
  color: var(--color-ink-muted);
  border-top: 1px solid var(--color-border);
  padding-top: 0.85rem;
}

.meta-item strong {
  color: var(--color-ink);
}

/* Scrolly Layout */
.scrolly-container {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  position: relative;
  margin: 1rem 0 3rem;
  gap: 1.5rem;
}

.stage-column {
  position: sticky;
  top: 1rem;
  height: calc(100vh - 2rem);
  max-height: 720px;
  display: flex;
  flex-direction: column;
  padding: 0 0 0 1.5rem;
  z-index: 10;
}

.stage-card {
  background: var(--color-paper-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 1.25rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

.stage-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.6rem;
  margin-bottom: 0.75rem;
}

.stage-title {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-ink);
}

.stage-indicator {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-ink-faint);
  background: var(--color-border-subtle);
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
}

.stage-svg-wrap {
  flex: 1;
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 380px;
}

.stage-svg {
  width: 100%;
  height: 100%;
  display: block;
}

.stage-footnote {
  margin-top: 0.5rem;
  font-size: 0.75rem;
  color: var(--color-ink-muted);
  display: flex;
  justify-content: space-between;
  border-top: 1px solid var(--color-border-subtle);
  padding-top: 0.4rem;
}

/* Prose Narrative Steps */
.prose-column {
  padding: 0 1.5rem 40vh 0.5rem;
}

.scene-step {
  min-height: 80vh;
  display: flex;
  align-items: center;
  margin-bottom: 3.5rem;
}

.step-card {
  background: var(--color-paper-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, border-color 0.2s ease;
  width: 100%;
  max-width: 540px;
}

.scene-step[data-active="true"] .step-card {
  border-color: var(--color-brand);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.step-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-brand);
  margin-bottom: 0.4rem;
  display: inline-block;
}

.step-title {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-ink);
  margin-bottom: 0.85rem;
}

.step-body {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--color-ink-muted);
}

.step-body p + p {
  margin-top: 0.8rem;
}

.stat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
  margin: 1.2rem 0 0.3rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--color-border);
}

.stat-box {
  background: var(--color-border-subtle);
  padding: 0.7rem;
  border-radius: var(--radius-md);
}

.stat-value {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-ink);
  line-height: 1.1;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--color-ink-muted);
  margin-top: 0.25rem;
}

/* Tooltip */
.stage-tooltip {
  position: absolute;
  pointer-events: none;
  background: var(--color-paper-card);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
  padding: 0.6rem 0.8rem;
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  z-index: 50;
  opacity: 0;
  transition: opacity 0.15s ease;
  max-width: 240px;
}

/* Methodology & Footer */
.story-footer {
  max-width: 860px;
  margin: 2rem auto 4rem;
  padding: 2rem 1.5rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.875rem;
  color: var(--color-ink-muted);
}

.methodology-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 0.75rem;
}

.methodology-text {
  line-height: 1.6;
  margin-bottom: 1rem;
}

.source-credits {
  font-size: 0.8rem;
  color: var(--color-ink-faint);
}

/* Mobile Responsiveness */
@media (max-width: 900px) {
  .interactive-wrapper {
    padding: 0;
  }

  .story-header {
    padding: 1.75rem 1rem 1rem;
  }

  .scrolly-container {
    grid-template-columns: 1fr;
    margin: 0;
    gap: 0;
  }

  .stage-column {
    top: 0;
    height: 32vh;
    min-height: 230px;
    max-height: 260px;
    padding: 0.5rem;
  }

  .stage-card {
    padding: 0.65rem 0.75rem;
  }

  .stage-header {
    margin-bottom: 0.25rem;
    padding-bottom: 0.25rem;
  }

  .stage-title {
    font-size: 0.95rem;
  }

  .stage-svg-wrap {
    min-height: 150px;
  }

  .prose-column {
    padding: 0 1rem 30vh;
  }

  .scene-step {
    min-height: 75vh;
    display: flex;
    align-items: flex-start;
    padding-top: 34vh;
    margin-bottom: 1.5rem;
  }

  .step-card {
    padding: 1.25rem;
  }

  .step-title {
    font-size: 1.2rem;
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}