/* ============================================================
 * R360.ai — The Corridor Stylesheet
 * Art direction: The Brief
 * One typeface. One voice.
 *
 * TYPE HIERARCHY:
 *   Body: roman (Instrument Serif regular)
 *   Display (headline, bridges): italic
 *   Emphasis: italic — the natural inversion
 *   Labels/tags: roman, uppercase, tracked
 * ============================================================ */

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

body {
  background: var(--surface-base);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-style: var(--font-style-body);
  line-height: var(--primitive-leading-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.corridor {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--space-page-x);
}

/* === OPENING === */
.opening {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--primitive-space-20) 0;
}

.headline {
  font-size: var(--primitive-text-2xl);
  line-height: var(--primitive-leading-tight);
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: var(--primitive-space-6);
  font-weight: 400;
  font-style: var(--font-style-display);
}

.byline {
  font-size: var(--primitive-text-md);
  color: var(--text-secondary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-style: normal;
  margin-bottom: var(--primitive-space-1);
}

.subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-style: normal;
  margin-bottom: var(--primitive-space-12);
}

/* === PROGRESS === */
.progress {
  display: flex;
  align-items: center;
  gap: var(--primitive-space-4);
  margin-bottom: var(--primitive-space-4);
}

.progress-circle {
  width: 12px;
  height: 12px;
  border-radius: var(--primitive-radius-full);
  border: 1.5px solid var(--accent-dim);
  background: transparent;
  flex-shrink: 0;
}

.progress-circle.active {
  background: var(--accent-active);
  border-color: var(--accent-active);
}

.progress-line {
  flex: 1;
  height: 1px;
  background: var(--surface-border);
}

.progress-label {
  font-size: var(--primitive-text-sm);
  color: var(--text-muted);
  font-style: var(--font-style-display);
  margin-bottom: var(--primitive-space-8);
}

/* === PROSE — roman body, italic emphasis === */
.prose {
  margin: var(--primitive-space-8) 0;
}

.prose p {
  font-size: 1.15rem;
  line-height: 1.85;
  color: var(--text-secondary);
  font-style: normal;
  margin-bottom: 1.2em;
}

.prose p:last-child {
  margin-bottom: 0;
}

.prose em {
  color: var(--text-primary);
  font-style: var(--font-style-emphasis);
}

/* === ROOM SECTIONS === */
.room-section {
  padding: var(--primitive-space-12) 0 var(--primitive-space-8);
}

.room-heading {
  font-size: var(--primitive-text-sm);
  color: var(--text-muted);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-style: normal;
  margin-bottom: var(--primitive-space-8);
}

/* === ANNOTATIONS — italic pull quotes === */
.annotation {
  border-left: 2px solid var(--accent-dim);
  padding-left: var(--primitive-space-6);
  margin: var(--primitive-space-10) 0;
  font-size: 1.1rem;
  line-height: var(--primitive-leading-relaxed);
  color: var(--text-secondary);
  font-style: var(--font-style-display);
}

.annotation em {
  color: var(--text-primary);
  font-style: normal;
}

/* === TRANSITIONS — italic bridge questions === */
.transition {
  text-align: center;
  padding: var(--primitive-space-10) 0;
  border-top: 1px solid var(--surface-border);
  margin-top: var(--primitive-space-8);
}

.transition-tag {
  display: inline-block;
  font-size: var(--primitive-text-xs);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
  border: 1px solid var(--surface-border);
  padding: 3px 10px;
  margin-bottom: var(--primitive-space-6);
  font-style: normal;
}

.transition p {
  font-size: var(--primitive-text-lg);
  color: var(--text-secondary);
  font-style: var(--font-style-display);
  max-width: 480px;
  margin: 0 auto;
  line-height: 1.6;
}

/* === INTERACTIVE MOUNT POINTS === */
#room-1, #room-2, #room-3, #room-4, #room-5 {
  margin: var(--primitive-space-8) 0;
}

/* === SUMMARY FRAME === */
.summary-frame {
  padding: var(--primitive-space-16) 0 var(--primitive-space-12);
  border-top: 1px solid var(--surface-border);
}

.summary-text {
  font-size: var(--primitive-text-xl);
  font-style: var(--font-style-display);
  color: var(--text-primary);
  line-height: var(--primitive-leading-relaxed);
  margin-bottom: 0.8em;
}

.summary-cta-block {
  max-width: 520px;
  margin: var(--primitive-space-10) auto 0;
  text-align: center;
}

.summary-cta {
  font-size: 1.05rem;
  color: var(--text-secondary);
  font-style: normal;
  line-height: 1.8;
  margin-bottom: 0.8em;
}

.summary-cta-small {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-style: var(--font-style-display);
  line-height: 1.7;
  margin-bottom: 0.8em;
}

.summary-cta-close {
  font-size: 1.05rem;
  color: var(--text-primary);
  font-style: normal;
  line-height: 1.7;
  margin-bottom: var(--primitive-space-8);
}

.substack-embed {
  max-width: 480px;
  margin: 0 auto;
}

/* === BIO BLOCK === */
.bio-block {
  max-width: 520px;
  margin: var(--primitive-space-12) auto;
  text-align: left;
}

.bio-block p {
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--text-secondary);
  font-style: normal;
  margin-bottom: 1.2em;
}

.bio-block p:last-of-type:not(.bio-links) {
  margin-bottom: 1.2em;
}

.bio-links {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: var(--primitive-space-6);
}

.bio-links a {
  color: var(--text-muted);
  text-decoration: none;
  transition: text-decoration 0.15s;
}

.bio-links a:hover {
  text-decoration: underline;
}

/* === RESPONSIVE === */
@media (max-width: 600px) {
  .headline {
    font-size: 1.8rem;
  }

  .corridor {
    padding: 0 16px;
  }

  .prose p {
    font-size: 1.05rem;
    line-height: 1.75;
  }

  .annotation {
    font-size: 1rem;
    padding-left: 16px;
  }

  .summary-text {
    font-size: 1.25rem;
  }

  /* Cut section spacing roughly in half on mobile (P1-8) */
  .room-section {
    padding: var(--primitive-space-8) 0 var(--primitive-space-4);
  }

  .transition {
    padding: var(--primitive-space-6) 0;
  }

  .opening {
    padding: var(--primitive-space-12) 0;
  }

  .summary-frame {
    padding: var(--primitive-space-10) 0 var(--primitive-space-8);
  }
}

/* === NO-JS STATIC FALLBACK (Constitution 4.5) === */
.noscript-interactive {
  background: var(--surface-raised);
  border: 1px solid var(--surface-border);
  padding: 24px;
  margin: var(--primitive-space-8) 0;
}

.noscript-interactive .noscript-label {
  font-size: var(--primitive-text-xs);
  color: var(--text-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-style: normal;
  margin-bottom: var(--primitive-space-4);
}

.noscript-interactive p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-secondary);
  font-style: normal;
  margin-bottom: 0.8em;
}

.noscript-interactive p:last-child {
  margin-bottom: 0;
}

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

/* === REDUCED MOTION === */
@media (prefers-reduced-motion: reduce) {
  * {
    transition-duration: 0ms !important;
    animation-duration: 0ms !important;
  }
}