/* ── Exhibit Frame ────────────────────────────────
   Shared structural CSS for all stepper exhibits:
   frame, story panel, step content, nav bar, legend,
   background layers, and dark panel variant. */

/* ── Heading utility classes ─────────────────────
   Apply to any element: <h1 class="heading-lg subtle">
   Use .subtle to shift to --color-text-subtle.     */
.heading-display,
.heading-lg,
.heading-md,
.heading-sm {
  font-family: var(--font-heading);
  color: var(--color-text);
}
.heading-display {
  font-size: var(--type-display-size);
  font-weight: var(--type-display-weight);
  line-height: var(--type-display-line);
}
.heading-lg {
  font-size: var(--type-heading-lg-size);
  font-weight: var(--type-heading-lg-weight);
  line-height: var(--type-heading-lg-line);
}
.heading-md {
  font-size: var(--type-heading-md-size);
  font-weight: var(--type-heading-md-weight);
  line-height: var(--type-heading-md-line);
}
.heading-sm {
  font-size: var(--type-heading-sm-size);
  font-weight: var(--type-heading-sm-weight);
  line-height: var(--type-heading-sm-line);
}
.subtle {
  color: var(--color-text-subtle);
}
.body-text {
  font-family: var(--font-body);
  font-size: var(--type-body-size);
  font-weight: var(--type-body-weight);
  line-height: var(--type-body-line);
  color: var(--color-text);
}

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

body {
  font-family: var(--font-body);
  font-size: var(--step-1);
  line-height: 1.7;
  color: var(--wrmp-text);
  background: #f4f4f4;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: var(--space-md);
}

/* ── Embed Frame ─────────────────────────────── */
.exhibit-frame {
  position: relative;
  width: 100%;
  max-width: 1200px;
  aspect-ratio: 16 / 9;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 4px 40px rgba(0, 0, 0, 0.15);
  background: #e8e8e8;
}

/* ── Map (full bleed behind everything) ────────── */
#map {
  position: absolute;
  inset: 0;
  z-index: 1;
}

/* ── Background Layers ───────────────────────── */
.bg-layer {
  position: absolute;
  inset: 0;
  z-index: 1;
  opacity: 0;
  transition: opacity 0.6s ease;
  pointer-events: none;
}

.bg-layer.active {
  opacity: 1;
  pointer-events: auto;
}

/* Video backgrounds */
.bg-video video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.bg-video::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to right,
    rgba(0, 0, 0, 0.45) 0%,
    rgba(0, 0, 0, 0.15) 50%,
    rgba(0, 0, 0, 0.05) 100%
  );
  z-index: 1;
}

.bg-video .photo-credit {
  z-index: 2;
}

/* Photo backgrounds */
.bg-photo {
  background-size: cover;
  background-position: center;
}

.bg-photo::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to right,
    rgba(0, 0, 0, 0.45) 0%,
    rgba(0, 0, 0, 0.15) 50%,
    rgba(0, 0, 0, 0.05) 100%
  );
}

/* Gradient backgrounds */
.bg-gradient {
  background: linear-gradient(135deg, #f8fafb 0%, #e8eef2 100%);
}

/* Photo credit overlay */
.photo-credit {
  position: absolute;
  bottom: 8px;
  right: 12px;
  font-size: var(--step--1);
  color: rgba(255, 255, 255, 0.6);
  z-index: 2;
}

/* ── Overlay Cards (cover/end screens) ─────────── */
.overlay-screen {
  position: absolute;
  inset: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  opacity: 1;
  transition: opacity 0.8s ease;
}

.overlay-screen.is-hidden {
  display: none;
}

.overlay-screen.is-leaving {
  opacity: 0;
  pointer-events: none;
}

.overlay-screen--grass-3 {
  background: var(--grass-3);
}

.overlay-screen--grass-2 {
  background: var(--grass-2);
}

.overlay-card {
  width: min(760px, 100%);
  max-height: calc(100vh - 8rem);
  overflow: auto;
  padding: var(--space-xl);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 12px 30px rgba(29, 36, 39, 0.12);
}

.overlay-card .kicker {
  display: block;
  font-size: var(--step--1);
  font-weight: 700;
  font-style: normal;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  line-height: 1;
  margin-bottom: var(--space-sm);
  color: var(--gray-11);
}

.overlay-card .heading-display {
  color: var(--gray-12);
  margin: 0 0 var(--space-md);
}

.overlay-card .body-text {
  color: var(--gray-11);
}

.overlay-links {
  margin: var(--space-md) 0 var(--space-lg);
  padding-left: 1.2rem;
  color: var(--gray-11);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.5;
}

.overlay-links li + li {
  margin-top: var(--space-xs);
}

.overlay-links a {
  color: var(--gray-12);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 2px;
}

.overlay-actions {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.overlay-button {
  margin-top: var(--space-md);
  padding: var(--space-xs) var(--space-md);
  border-radius: 8px;
  border: 1px solid var(--gray-6);
  background: var(--gray-2);
  color: var(--gray-12);
  font-family: var(--font-body);
  font-size: var(--step-0);
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}

.overlay-button:hover {
  background: var(--gray-3);
}

.overlay-actions .overlay-button {
  margin-top: 0;
}

/* ── Story Panel (left overlay, inset) ─────────── */
.story-panel {
  position: absolute;
  top: var(--panel-inset);
  left: var(--panel-inset);
  bottom: var(--panel-inset);
  width: var(--panel-width);
  z-index: 10;
  display: flex;
  flex-direction: column;
  border-radius: 12px;
  overflow: hidden;
  box-shadow:
    0 8px 32px rgba(0, 0, 0, 0.12),
    0 2px 8px rgba(0, 0, 0, 0.08);
}

.story-panel-inner {
  flex: 1;
  background: var(--panel-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: var(--space-lg) var(--space-lg) var(--space-md);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: background 0.4s ease;
}

/* ── Dark Panel Variant ──────────────────────── */
.story-panel.panel-dark {
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}
.story-panel.panel-dark .story-panel-inner {
  background: rgba(30, 30, 30, 0.82);
  backdrop-filter: blur(62px);
  -webkit-backdrop-filter: blur(62px);
  border-radius: 12px 12px 0 0;
}
.story-panel.panel-dark .step h2 {
  color: var(--gray-12);
}
.story-panel.panel-dark .step .kicker {
  color: var(--gray-11);
}
.story-panel.panel-dark .step .step-header-mark {
  opacity: 0.92;
}
.story-panel.panel-dark .step .body p {
  color: var(--gray-11);
}
.story-panel.panel-dark .step .callout {
  color: var(--gray-12);
}
.story-panel.panel-dark .step .stat-pill:not(:last-child) {
  border-right-color: var(--gray-a6);
}
.story-panel.panel-dark .step .stat-pill .num {
  color: var(--gray-12);
}
.story-panel.panel-dark .step .stat-pill .lbl,
.story-panel.panel-dark .step .stat-pill .sub {
  color: var(--gray-11);
}
.story-panel.panel-dark .nav-bar {
  background: rgba(24, 24, 24, 0.78);
  border-top-color: rgba(255, 255, 255, 0.14);
}
.story-panel.panel-dark .nav-bar button {
  background: rgba(255, 255, 255, 0.12);
  color: var(--gray-12);
  border-color: rgba(255, 255, 255, 0.22);
}
.story-panel.panel-dark .nav-bar button:hover {
  background: rgba(255, 255, 255, 0.2);
}
.story-panel.panel-dark .nav-bar button:disabled {
  opacity: 0.25;
}
.story-panel.panel-dark .nav-bar .step-dot {
  background: rgba(255, 255, 255, 0.42);
}
.story-panel.panel-dark .nav-bar .step-dot.active {
  background: var(--gray-12);
}

/* ── Step Content ────────────────────────────── */
.step {
  display: none;
  flex-direction: column;
  flex: 1;
  animation: fadeIn 0.4s ease;
}

.step.active {
  display: flex;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Step title block: transparent icon mark + kicker + h2 */
.step-header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.step-header-mark {
  width: 40px;
  height: auto;
  align-self: stretch;
  flex-shrink: 0;
  object-fit: contain;
  object-position: center;
  display: block;
  opacity: 0.88;
}

.step-header-text {
  flex: 1;
  min-width: 0;
}

.step .kicker {
  font-size: var(--step--1);
  font-weight: 700;
  font-style: normal;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  line-height: 1;
  color: var(--gray-11);
  margin-bottom: var(--space-xs);
}

.step h2 {
  font-family: var(--font-heading);
  font-size: var(--type-display-size);
  font-weight: var(--type-display-weight);
  line-height: var(--type-display-line);
  margin-bottom: var(--space-md);
  color: var(--gray-12);
  transition: color 0.4s ease;
}

.step .step-header h2 {
  margin-bottom: 0;
}

.step h3 {
  font-family: var(--font-heading);
  font-size: var(--type-heading-md-size);
  font-weight: var(--type-heading-md-weight);
  line-height: var(--type-heading-md-line);
  margin-bottom: var(--space-sm);
  color: var(--gray-12);
}

.step h4 {
  font-family: var(--font-heading);
  font-size: var(--type-heading-sm-size);
  font-weight: var(--type-heading-sm-weight);
  line-height: var(--type-heading-sm-line);
  margin-bottom: var(--space-xs);
  color: var(--gray-12);
}

.step .body {
  flex: 1;
  overflow-y: auto;
}
.step .body p {
  font-size: var(--type-body-size);
  font-weight: var(--type-body-weight);
  line-height: var(--type-body-line);
  color: var(--color-text-subtle);
  margin-bottom: var(--space-md);
  transition: color 0.4s ease;
}
.step .body:last-child p:last-child {
  margin-bottom: 0;
}

.step .stat-row {
  display: flex;
  gap: 0;
  margin: var(--space-md) 0;
}

.step .stat-pill {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  padding: var(--space-sm);
  flex: 1;
  text-align: left;
}

.step .stat-pill:not(:last-child) {
  border-right: 1px solid rgba(0, 0, 0, 0.12);
  padding-right: var(--space-md);
}

.step .stat-pill:not(:first-child) {
  padding-left: var(--space-md);
}

.step .stat-pill .lbl {
  order: 1;
  font-size: var(--step--1);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  line-height: 1;
  color: var(--gray-11);
}

.step .stat-pill .num {
  order: 2;
  font-size: var(--step-1);
  font-weight: 700;
  line-height: 1.2;
  color: var(--gray-12);
}

.step .stat-pill .sub {
  order: 3;
  font-size: var(--step--1);
  font-weight: 400;
  line-height: 1.1;
  color: var(--gray-11);
}

.step .callout {
  position: relative;
  display: block;
  padding: var(--space-sm) var(--space-md) var(--space-sm) calc(4px + 10px);
  border-radius: 8px;
  margin: var(--space-md) 0;
  font-size: var(--step-1);
  font-weight: 500;
  line-height: 1.3;
  color: var(--wrmp-dark);
}

.step .callout::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--wrmp-light-green);
  border-radius: 2px;
}

.step .callout.warning::before {
  background: var(--wrmp-orange);
}

/* ── Map Legend (floating overlay, top-right) ──── */
.map-legend {
  position: absolute;
  top: var(--panel-inset);
  right: var(--panel-inset);
  z-index: 10;
  display: flex;
  flex-direction: column;
  gap: 3px;
  pointer-events: auto;
}

.map-legend:empty {
  display: none;
}

.map-legend-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 8px;
  font-size: var(--step-0);
  font-weight: 500;
  color: var(--gray-12);
  cursor: pointer;
  transition:
    background 0.15s,
    box-shadow 0.15s,
    opacity 0.15s;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
  user-select: none;
}

.map-legend-chip:hover {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
}

.map-legend-chip.active {
  background: rgba(255, 255, 255, 0.97);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  font-weight: 600;
}

.map-legend-chip.dimmed {
  opacity: 0.45;
}

/* Reserve bold width so the chip never resizes on activation.
   The ::after mirrors the label text at font-weight 600 but stays
   invisible — it pre-expands the container to its maximum size. */
.map-legend-chip-label {
  display: inline-flex;
  flex-direction: column;
}

.map-legend-chip-label::after {
  content: attr(data-label);
  font-weight: 600;
  visibility: hidden;
  height: 0;
  overflow: hidden;
  pointer-events: none;
  user-select: none;
}

.map-legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
  border: 1.5px solid rgba(255, 255, 255, 0.8);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.1);
}

/* ── Navigation Bar ──────────────────────────── */
.nav-bar {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  background: rgba(240, 240, 240, 0.65);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 0 0 12px 12px;
  transition:
    background 0.4s ease,
    border-color 0.4s ease;
}

.nav-bar button {
  font-family: var(--font-body);
  font-size: var(--step-0);
  font-weight: 600;
  padding: var(--space-xs) var(--space-md);
  border: 1px solid #ccc;
  border-radius: 6px;
  background: #fff;
  cursor: pointer;
  color: var(--gray-12);
  transition: background 0.15s;
}

.nav-bar button:hover {
  background: #f0f0f0;
}
.nav-bar button:disabled {
  opacity: 0.35;
  cursor: default;
}

.step-dots {
  display: flex;
  gap: 10px;
  flex: 1;
  justify-content: center;
  align-items: center;
}

.nav-bar .step-dot {
  all: unset;
  display: block;
  width: 8px;
  height: 8px;
  padding: 0;
  border: none;
  border-radius: 4px;
  background: #4e4e50;
  opacity: 0.4;
  transition:
    width 0.35s ease,
    opacity 0.35s ease,
    background 0.35s ease;
  cursor: pointer;
  flex-shrink: 0;
  box-sizing: border-box;
}

.nav-bar .step-dot:hover {
  opacity: 0.6;
  background: #4e4e50;
}

.nav-bar .step-dot.active {
  width: 36px;
  background: var(--gray-12);
  opacity: 1;
}

.step-counter {
  display: none;
}

/* ── POI / Station Labels (shared chip; class name = semantic only) ── */
.poi-label,
.station-label {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid #ccc;
  border-radius: 6px;
  padding: 4px 10px;
  font-family: var(--font-body);
  font-size: var(--step--1);
  font-weight: 600;
  color: var(--gray-12);
  white-space: nowrap;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.12);
  pointer-events: none;
}