/* ============================================================
 * R360.ai — Base Stylesheet
 * Art direction: Source Serif 4, warm charcoal, gold.
 * One typeface. One voice.
 *
 * TYPE HIERARCHY:
 *   Body: roman (Source Serif 4, weight ~360 for dark-mode halation control)
 *   Display (headline, bridges): italic, weight 300
 *   Emphasis: italic — the natural inversion
 *   Labels/tags: roman, uppercase, tracked, weight ~420
 * ============================================================ */

*, *::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);
  font-weight: 360;
  font-optical-sizing: auto;
  line-height: var(--primitive-leading-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-tap-highlight-color: transparent;
}

/* === SKIP LINK (WCAG 2.4.1) === */
.skip-link {
  position: absolute;
  left: -9999px;
  top: var(--primitive-space-4);
  background: var(--accent-active);
  color: var(--surface-base);
  padding: var(--primitive-space-2) var(--primitive-space-4);
  font-size: var(--primitive-text-sm);
  z-index: 1000;
  text-decoration: none;
}

.skip-link:focus {
  left: var(--primitive-space-4);
}

/* Visually hidden but accessible to screen readers */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* === FOCUS BASELINE (WCAG 2.4.7) === */
:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

/* === PAGE CONTENT CONTAINER === */
.page-content {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--space-page-x);
}

/* Room pages get top padding for the fixed nav */
.page-content--room {
  padding-top: calc(48px + var(--primitive-space-12));
}

/* === ROOM STRUCTURE === */
.room-header {
  padding: var(--primitive-space-16) 0 var(--primitive-space-8);
  border-bottom: 1px solid var(--surface-border);
  margin-bottom: var(--primitive-space-8);
}

.room-number {
  font-size: var(--primitive-text-xs);
  color: var(--accent-active);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-style: normal;
  margin-bottom: var(--primitive-space-2);
}

.room-title {
  font-size: var(--primitive-text-xl);
  font-weight: 300;
  font-style: var(--font-style-display);
  color: var(--text-primary);
  line-height: var(--primitive-leading-tight);
}

/* === PROSE === */
.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);
}

/* === 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;
}

/* === PRACTICAL TAKEAWAY === */
.practical {
  background: var(--surface-raised);
  border: 1px solid var(--surface-border);
  padding: var(--primitive-space-8);
  margin: var(--primitive-space-10) 0;
}

.practical-heading {
  font-size: var(--primitive-text-xs);
  color: var(--accent-active);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-style: normal;
  margin-bottom: var(--primitive-space-6);
}

.practical p {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
  font-style: normal;
  margin-bottom: 1em;
}

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

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

/* === SIMULATION NOTE === */
.sim-note {
  font-size: var(--primitive-text-sm);
  color: var(--text-muted);
  font-style: var(--font-style-display);
  margin: var(--primitive-space-4) 0;
  text-align: center;
}

/* === INTERACTIVE MOUNT POINTS === */
.interactive-mount {
  margin: var(--primitive-space-10) 0;
}

/* === ROOM TRANSITION / NEXT ROOM === */
.room-next {
  text-align: center;
  padding: var(--primitive-space-16) 0 var(--primitive-space-12);
  border-top: 1px solid var(--surface-border);
  margin-top: var(--primitive-space-12);
}

.room-next-tag {
  display: inline-block;
  font-size: var(--primitive-text-xs);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: var(--primitive-space-4);
  font-style: normal;
}

.room-next-bridge {
  font-size: var(--primitive-text-lg);
  color: var(--text-secondary);
  font-style: var(--font-style-display);
  max-width: 480px;
  margin: 0 auto var(--primitive-space-8);
  line-height: 1.6;
}

.room-next-link {
  display: inline-block;
  padding: var(--primitive-space-3) var(--primitive-space-8);
  border: 1px solid var(--accent-dim);
  color: var(--accent-active);
  font-size: var(--primitive-text-sm);
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
  font-style: normal;
  transition: border-color var(--duration-transition) var(--easing-interaction),
              color var(--duration-transition) var(--easing-interaction);
}

.room-next-link:hover {
  border-color: var(--accent-active);
  color: var(--text-primary);
}

.room-next-link:active {
  border-color: var(--accent-active);
  color: var(--text-primary);
}

/* === FOOTER === */
.site-footer {
  border-top: 1px solid var(--surface-border);
  padding: var(--primitive-space-8) var(--space-page-x);
  padding-bottom: max(var(--primitive-space-8), env(safe-area-inset-bottom));
  margin-top: var(--primitive-space-16);
}

.site-footer-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: var(--primitive-space-3);
  flex-wrap: wrap;
}

.site-footer-brand {
  font-size: var(--primitive-text-sm);
  color: var(--text-muted);
  letter-spacing: 0.06em;
}

.site-footer-sep { color: var(--text-muted); }

.site-footer a {
  font-size: var(--primitive-text-sm);
  color: var(--text-muted);
  text-decoration: none;
}

.site-footer a:hover { text-decoration: underline; }

/* === NOSCRIPT === */
.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; }

/* === RESPONSIVE === */
@media (max-width: 600px) {
  .page-content { padding: 0 var(--primitive-space-4); }

  .prose p { font-size: 1.05rem; line-height: 1.75; }
  .annotation { font-size: 1rem; padding-left: var(--primitive-space-4); }
  .practical { padding: var(--primitive-space-6); }

  .room-header { padding: var(--primitive-space-10) 0 var(--primitive-space-6); }

  .room-next { padding: var(--primitive-space-10) 0 var(--primitive-space-8); }

}

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