/* ============================================================
   ChronoDino — ERA-TOUR.CSS
   ============================================================ */

/* ─── ERA HERO ────────────────────────────────────────────── */
.era-hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: flex-end;
  justify-content: flex-start;
  overflow: hidden;
}

.era-hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  z-index: 0;
  transform: scale(1.05);
  transition: transform 8s ease;
}

.era-hero.loaded .era-hero-bg {
  transform: scale(1);
}

.era-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(0,0,0,0.85) 0%,
    rgba(0,0,0,0.4) 50%,
    rgba(0,0,0,0.2) 100%
  );
  z-index: 1;
}

.era-hero-overlay-bottom {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 40%;
  background: linear-gradient(to top, var(--clr-void), transparent);
  z-index: 2;
}

.era-hero-content {
  position: relative;
  z-index: 3;
  padding: var(--sp-16) var(--sp-6);
  padding-bottom: calc(var(--sp-24) + 40px);
  max-width: var(--max-width);
  margin-inline: auto;
  width: 100%;
}

.era-back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(245,234,208,0.6);
  margin-bottom: var(--sp-8);
  transition: color var(--t-fast), gap var(--t-fast);
}

.era-back-link:hover {
  color: var(--clr-amber);
  gap: var(--sp-3);
}

.era-hero-eyebrow {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin-bottom: var(--sp-4);
}

.era-period-badge {
  font-weight: 800;
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 6px 16px;
  border-radius: var(--r-pill);
  color: white;
}

.era-hero-title {
  font-family: var(--font-display);
  font-size: clamp(3rem, 8vw, 6rem);
  color: var(--clr-bone);
  line-height: 1;
  margin-bottom: var(--sp-4);
  text-shadow: 0 4px 30px rgba(0,0,0,0.5);
}

.era-hero-subtitle {
  font-size: 1.1rem;
  color: rgba(245,234,208,0.75);
  max-width: 520px;
  line-height: 1.7;
  margin-bottom: var(--sp-8);
}

/* Audio Player slot */
.era-audio-player {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-4);
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(232,160,32,0.2);
  border-radius: var(--r-pill);
  padding: var(--sp-3) var(--sp-6);
}

/* MUSIC PLACEHOLDER COMMENT:
   Replace the <audio> src below with your music file path.
   Example: assets/audio/cretaceous-theme.mp3
*/

.audio-play-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--clr-amber);
  color: var(--clr-void);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  transition: transform var(--t-fast), box-shadow var(--t-fast);
  flex-shrink: 0;
}

.audio-play-btn:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-amber);
}

.audio-info {
  flex: 1;
}

.audio-title {
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--clr-bone);
  line-height: 1.2;
}

.audio-subtitle {
  font-size: 0.7rem;
  color: var(--clr-fossil);
}

/* Era audio volume slider */
.era-audio-vol {
  width: 90px;
  height: 4px;
  appearance: none;
  -webkit-appearance: none;
  background: rgba(245,234,208,0.2);
  border-radius: 999px;
  outline: none;
  cursor: pointer;
  flex-shrink: 0;
  margin-left: auto;
}
.era-audio-vol::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--clr-amber);
  border: 2px solid var(--clr-void);
  box-shadow: 0 0 10px rgba(232,160,32,0.5);
  transition: transform var(--t-fast), box-shadow var(--t-fast);
}
.era-audio-vol::-webkit-slider-thumb:hover {
  transform: scale(1.15);
  box-shadow: 0 0 16px rgba(232,160,32,0.8);
}
.era-audio-vol::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--clr-amber);
  border: 2px solid var(--clr-void);
  box-shadow: 0 0 10px rgba(232,160,32,0.5);
  cursor: pointer;
}
.era-audio-vol::-moz-range-track {
  height: 4px;
  background: rgba(245,234,208,0.2);
  border-radius: 999px;
}

/* ─── ERA LANG TOGGLE FLOAT ───────────────────────────────── */
.era-lang-float {
  position: fixed;
  top: calc(var(--header-h) + var(--sp-4));
  right: var(--sp-6);
  z-index: 500;
}

/* ─── ERA FACTS SECTION ───────────────────────────────────── */
.era-facts {
  padding-block: var(--sp-24);
  position: relative;
}

.era-facts-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--sp-16);
  align-items: start;
}

.era-facts-headline {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  color: var(--clr-bone);
  margin-bottom: var(--sp-6);
  line-height: 1.15;
}

.era-facts-headline em {
  font-style: normal;
  color: var(--clr-amber);
}

.era-facts-body {
  color: var(--clr-fossil);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: var(--sp-6);
}

/* Info cards stacked */
.era-info-cards {
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}

.era-info-card {
  background: var(--clr-mud);
  border: 1px solid rgba(232,160,32,0.1);
  border-radius: var(--r-lg);
  padding: var(--sp-5) var(--sp-6);
  position: relative;
  overflow: hidden;
  transition: border-color var(--t-med);
  cursor: default;
}

.era-info-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--clr-amber);
}

.era-info-card:hover {
  border-color: rgba(232,160,32,0.25);
}

.era-info-card-header {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin-bottom: var(--sp-3);
}

.era-info-card-icon {
  font-size: 1.3rem;
}

.era-info-card-title {
  font-weight: 800;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-amber);
}

.era-info-card-text {
  font-size: 0.9rem;
  color: rgba(245,234,208,0.75);
  line-height: 1.7;
}

/* ─── ERA CLIMATE VISUAL ──────────────────────────────────── */
.era-climate-section {
  padding-block: var(--sp-16) var(--sp-24);
  background: var(--clr-earth);
  position: relative;
  overflow: hidden;
}

.era-climate-canvas-wrap {
  width: 100%;
  height: 320px;
  border-radius: var(--r-xl);
  overflow: hidden;
  margin-bottom: var(--sp-8);
  border: 1px solid rgba(232,160,32,0.1);
  position: relative;
}

#era-climate-canvas {
  width: 100%;
  height: 100%;
}

.climate-labels {
  display: flex;
  justify-content: center;
  gap: var(--sp-8);
  flex-wrap: wrap;
}

.climate-label-item {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--clr-fossil);
}

.climate-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

/* ─── TIMELINE STRIP ──────────────────────────────────────── */
.era-timeline {
  padding-block: var(--sp-16) var(--sp-24);
}

.timeline-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--clr-bone);
  margin-bottom: var(--sp-12);
  text-align: center;
}

.timeline-track {
  position: relative;
  padding-left: var(--sp-8);
}

.timeline-track::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--clr-amber), transparent);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--sp-10);
  padding-left: var(--sp-8);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -var(--sp-8);
  left: -20px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--clr-amber);
  border: 2px solid var(--clr-void);
  box-shadow: 0 0 10px rgba(232,160,32,0.5);
}

.timeline-year {
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-amber);
  margin-bottom: var(--sp-2);
}

.timeline-event {
  font-size: 0.95rem;
  color: rgba(245,234,208,0.75);
  line-height: 1.6;
}

/* ─── TOP DINOS OF ERA ────────────────────────────────────── */
.era-dinos-section {
  padding-block: var(--sp-16) var(--sp-24);
  background: var(--clr-earth);
}

.era-dinos-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: var(--sp-10);
  flex-wrap: wrap;
  gap: var(--sp-4);
}

.era-dinos-header h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  color: var(--clr-bone);
}

.era-dinos-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--sp-4);
}

.era-dino-card {
  background: var(--clr-mud);
  border: 1px solid rgba(232,160,32,0.1);
  border-radius: var(--r-lg);
  overflow: hidden;
  cursor: pointer;
  transition: all var(--t-med);
}

.era-dino-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--shadow-lg);
  border-color: rgba(232,160,32,0.35);
}

.era-dino-card-num {
  position: absolute;
  top: var(--sp-3);
  left: var(--sp-3);
  width: 28px;
  height: 28px;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px);
  border-radius: var(--r-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--clr-amber);
  z-index: 1;
}

.era-dino-card-img-wrap {
  position: relative;
  aspect-ratio: 4/3;
  overflow: hidden;
}

.era-dino-card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--t-slow);
}

.era-dino-card:hover .era-dino-card-img {
  transform: scale(1.08);
}

.era-dino-card-body {
  padding: var(--sp-3) var(--sp-4) var(--sp-4);
}

.era-dino-card-name {
  font-family: var(--font-display);
  font-size: 0.95rem;
  color: var(--clr-bone);
  margin-bottom: var(--sp-1);
  line-height: 1.2;
}

.era-dino-card-diet {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ─── ERA RESPONSIVE ──────────────────────────────────────── */
@media (max-width: 1024px) {
  .era-facts-grid { grid-template-columns: 1fr; }
  .era-dinos-grid { grid-template-columns: repeat(4, 1fr); }
}

@media (max-width: 768px) {
  .era-dinos-grid { grid-template-columns: repeat(2, 1fr); }
  .era-dinos-header { flex-direction: column; align-items: flex-start; }
  .era-hero-title { font-size: 3rem; }
}

@media (max-width: 480px) {
  .era-dinos-grid { grid-template-columns: repeat(2, 1fr); gap: var(--sp-3); }
}

/* ═══════════════════════════════════════════════════════════
   ERA TOUR — EXPANDED SECTIONS (v2)
   Big immersive sections for climate, food habits, key events
   ═══════════════════════════════════════════════════════════ */

/* ─── FULL-BLEED SECTION ──────────────────────────────────── */
.era-big-section {
  padding-block: var(--sp-24);
  position: relative;
  overflow: hidden;
}

.era-big-section:nth-child(odd) {
  background: var(--clr-void);
}
.era-big-section:nth-child(even) {
  background: var(--clr-earth);
}

.era-big-section .section-bg-text {
  position: absolute;
  right: -1%;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-display);
  font-size: clamp(6rem, 14vw, 16rem);
  color: rgba(232,160,32,0.04);
  pointer-events: none;
  line-height: 1;
  white-space: nowrap;
  user-select: none;
}

/* ─── TWO-COL LAYOUT ──────────────────────────────────────── */
.era-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-16);
  align-items: center;
}

.era-split.reverse { direction: rtl; }
.era-split.reverse > * { direction: ltr; }

.era-split-text h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  color: var(--clr-bone);
  line-height: 1.15;
  margin-bottom: var(--sp-6);
}

.era-split-text h2 em {
  font-style: normal;
  color: var(--clr-amber);
}

.era-split-text p {
  font-size: 1.1rem;
  color: rgba(245,234,208,0.88);
  line-height: 1.9;
  margin-bottom: var(--sp-4);
}

.era-split-image {
  position: relative;
  border-radius: var(--r-xl);
  overflow: hidden;
  aspect-ratio: 1/1;
  box-shadow: var(--shadow-lg);
}

.era-split-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform var(--t-slow);
}

.era-split-image:hover img { transform: scale(1.04); }

.era-split-image-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.8) 0%, transparent 100%);
  padding: var(--sp-4) var(--sp-5);
  font-size: 0.8rem;
  color: rgba(245,234,208,0.7);
  font-style: italic;
}

/* ─── STAT SHOWCASE ROW ───────────────────────────────────── */
.era-stat-showcase {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-4);
  margin-top: var(--sp-10);
}

.era-stat-card {
  background: rgba(232,160,32,0.06);
  border: 1px solid rgba(232,160,32,0.15);
  border-radius: var(--r-lg);
  padding: var(--sp-6);
  text-align: center;
  transition: border-color var(--t-med), background var(--t-med);
}

.era-stat-card:hover {
  border-color: rgba(232,160,32,0.4);
  background: rgba(232,160,32,0.1);
}

.era-stat-card-icon { font-size: 2rem; display: block; margin-bottom: var(--sp-3); }
.era-stat-card-val {
  font-family: var(--font-display);
  font-size: 1.6rem;
  color: var(--clr-amber);
  display: block;
  line-height: 1.1;
  margin-bottom: var(--sp-2);
}
.era-stat-card-label {
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(139,115,85,1);
}
.era-stat-card-desc {
  font-size: 0.85rem;
  color: rgba(245,234,208,0.75);
  line-height: 1.6;
  margin-top: var(--sp-3);
}

/* ─── FOOD CHAIN VISUAL ───────────────────────────────────── */
.food-chain-row {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  padding: var(--sp-6);
  background: var(--clr-mud);
  border: 1px solid rgba(232,160,32,0.1);
  border-radius: var(--r-xl);
  margin-top: var(--sp-8);
  flex-wrap: wrap;
  justify-content: center;
}

.food-chain-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-2);
  text-align: center;
  min-width: 80px;
}

.food-chain-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  border: 2px solid rgba(232,160,32,0.2);
}

.food-chain-icon.apex   { background: rgba(192,57,43,0.2); border-color: rgba(192,57,43,0.5); }
.food-chain-icon.large  { background: rgba(230,126,34,0.15); border-color: rgba(230,126,34,0.4); }
.food-chain-icon.small  { background: rgba(39,174,96,0.15); border-color: rgba(39,174,96,0.4); }
.food-chain-icon.plant  { background: rgba(45,122,58,0.2); border-color: rgba(45,122,58,0.5); }

.food-chain-name {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--clr-bone);
  letter-spacing: 0.04em;
}

.food-chain-role {
  font-size: 0.65rem;
  color: rgba(139,115,85,1);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.food-chain-arrow {
  font-size: 1.4rem;
  color: rgba(232,160,32,0.4);
  flex-shrink: 0;
}

/* ─── CLIMATE GRID ────────────────────────────────────────── */
.climate-detail-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-5);
  margin-top: var(--sp-8);
}

.climate-detail-card {
  background: var(--clr-mud);
  border: 1px solid rgba(232,160,32,0.1);
  border-radius: var(--r-lg);
  padding: var(--sp-6);
}

.climate-detail-card-header {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin-bottom: var(--sp-4);
}

.climate-detail-card-icon { font-size: 1.6rem; }

.climate-detail-card-title {
  font-weight: 800;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-amber);
}

.climate-detail-card p {
  font-size: 0.95rem;
  color: rgba(245,234,208,0.88);
  line-height: 1.8;
}

/* ─── QUOTE CALLOUT ───────────────────────────────────────── */
.era-quote {
  padding: var(--sp-10) var(--sp-12);
  background: rgba(232,160,32,0.05);
  border: 1px solid rgba(232,160,32,0.15);
  border-radius: var(--r-xl);
  text-align: center;
  position: relative;
  margin-block: var(--sp-12);
}

.era-quote::before {
  content: '"';
  position: absolute;
  top: -20px;
  left: var(--sp-8);
  font-family: var(--font-display);
  font-size: 6rem;
  color: rgba(232,160,32,0.2);
  line-height: 1;
}

.era-quote p {
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2.5vw, 1.8rem);
  color: var(--clr-bone);
  line-height: 1.5;
  margin: 0;
}

/* ─── KEY EVENTS TIMELINE ─────────────────────────────────── */
.events-timeline {
  position: relative;
  padding-left: var(--sp-12);
  margin-top: var(--sp-8);
}

.events-timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--clr-amber), rgba(232,160,32,0.1));
}

.timeline-event-item {
  position: relative;
  margin-bottom: var(--sp-10);
}

.timeline-event-item::before {
  content: '';
  position: absolute;
  left: calc(-3rem - 2px);
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--clr-amber);
  border: 3px solid var(--clr-void);
  box-shadow: 0 0 12px rgba(232,160,32,0.6);
}

.timeline-event-year {
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--clr-amber);
  margin-bottom: var(--sp-2);
}

.timeline-event-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--clr-bone);
  margin-bottom: var(--sp-2);
}

.timeline-event-desc {
  font-size: 1rem;
  color: rgba(245,234,208,0.88);
  line-height: 1.8;
}

/* ─── RESPONSIVE ──────────────────────────────────────────── */
@media (max-width: 1024px) {
  .era-stat-showcase { grid-template-columns: repeat(2, 1fr); }
  .climate-detail-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .era-split { grid-template-columns: 1fr; gap: var(--sp-8); }
  .era-split.reverse { direction: ltr; }
  .era-stat-showcase { grid-template-columns: repeat(2, 1fr); }
  .climate-detail-grid { grid-template-columns: 1fr; }
  .food-chain-row { gap: var(--sp-3); }
  .food-chain-arrow { transform: rotate(90deg); }
  .era-quote { padding: var(--sp-8) var(--sp-6); }
  .era-quote p { font-size: 1.1rem; }
}

/* Food chain — mobile: clean vertical progression */
@media (max-width: 600px) {
  .food-chain-row {
    flex-direction: column;
    flex-wrap: nowrap;
    align-items: center;
    gap: var(--sp-3);
  }
  .food-chain-item {
    min-width: 0;
  }
}