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

:root {
  --bg: #000000;
  --surface: rgba(255, 255, 255, 0.03);
  --text: #c8c8d8;
  --text-dim: #6a6a80;
  --accent: #6eb5ff;
  --danger: #ff6b6b;
  --card-bg: rgba(8, 8, 30, 0.92);
  --card-border: rgba(255, 255, 255, 0.08);
}

html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  font-weight: 300;
  letter-spacing: 0.02em;
  user-select: none;
  -webkit-user-select: none;
}

canvas#sphere {
  position: fixed;
  inset: 0;
  display: block;
  cursor: crosshair;
}

/* ── Header ─────────────────────────────────────────────── */

.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 32px 40px;
  pointer-events: none;
  z-index: 20;
}

.title-group { text-align: left; }
.title {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.25em;
  color: var(--text-dim);
  margin-bottom: 4px;
}
#year-display {
  font-size: 5rem;
  font-weight: 100;
  line-height: 1;
  color: #fff;
  transition: color 2s ease;
}
.co2-group {
  margin-top: 8px;
  font-size: 0.85rem;
  color: var(--text-dim);
}
#co2-display {
  font-size: 1.8rem;
  font-weight: 200;
  transition: color 2s ease;
}
#co2-delta {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 2px;
}


/* ── Language toggle ────────────────────────────────────── */

.lang-toggle {
  position: fixed;
  top: 36px; right: 160px;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 12px;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 20px;
  background: rgba(8,8,30,0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  cursor: pointer;
  transition: border-color 0.25s;
  pointer-events: auto;
  font-size: 0.65rem;
  letter-spacing: 0.04em;
}
.lang-toggle:hover { border-color: rgba(255,255,255,0.3); }
.lang-zh, .lang-en {
  padding: 2px 6px;
  border-radius: 4px;
  transition: all 0.2s;
  color: rgba(255,255,255,0.4);
}
.lang-zh.active, .lang-en.active {
  color: #fff;
  background: rgba(255,255,255,0.1);
}
.lang-divider { color: rgba(255,255,255,0.15); }

/* ── Language select ────────────────────────────────────── */

.lang-select {
  position: fixed;
  top: 36px; right: 148px;
  z-index: 20;
  padding: 6px 10px;
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 16px;
  background: rgba(8,8,30,0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: rgba(255,255,255,0.7);
  font-size: 0.65rem;
  font-family: inherit;
  cursor: pointer;
  outline: none;
  pointer-events: auto;
  transition: border-color 0.25s;
  appearance: none;
  -webkit-appearance: none;
  padding-right: 22px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='8' height='6'%3E%3Cpath d='M0 0l4 6 4-6z' fill='rgba(255,255,255,0.4)'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 6px center;
}
.lang-select:hover { border-color: rgba(255,255,255,0.35); }
.lang-select option {
  background: #111;
  color: #ccc;
}

/* ── Rotate toggle ──────────────────────────────────────── */

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
  pointer-events: auto;
  margin-top: 4px;
}

.rotate-toggle {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 28px;
  background: rgba(8,8,30,0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  cursor: pointer;
  transition: border-color 0.25s, background 0.25s;
  pointer-events: auto;
}
.rotate-toggle:hover {
  border-color: rgba(255,255,255,0.35);
  background: rgba(8,8,30,0.9);
}

.rotate-label {
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.rotate-state {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  padding: 3px 10px;
  border-radius: 12px;
  min-width: 42px;
  text-align: center;
  transition: all 0.25s ease;
}
.rotate-state.on {
  background: rgba(110,181,255,0.18);
  color: #6eb5ff;
  box-shadow: 0 0 12px rgba(110,181,255,0.2);
}
.rotate-state.off {
  background: rgba(255,255,255,0.06);
  color: var(--text-dim);
}

.hint {
  position: fixed;
  top: 100px; right: 40px;
  font-size: 0.65rem;
  color: var(--text-dim);
  text-align: right;
  line-height: 1.8;
  z-index: 10;
  pointer-events: none;
}
.hint kbd {
  display: inline-block;
  padding: 1px 6px;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 3px;
  font-family: inherit;
  font-size: 0.6rem;
  margin: 0 2px;
}

/* ── Bottom controls ────────────────────────────────────── */

.controls {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  padding: 0 40px 40px;
  z-index: 10;
}

/* Timeline */

.timeline-container {
  position: relative;
  margin-bottom: 20px;
}

.milestones-row {
  position: relative;
  height: 44px;
  margin-bottom: 4px;
}
.milestone-dot {
  position: absolute;
  top: 0;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: rgba(255,255,255,0.35);
  box-shadow: 0 0 6px rgba(255,255,255,0.1);
  transform: translateX(-50%);
  cursor: pointer;
  transition: all 0.3s ease;
  z-index: 2;
}
.milestone-dot:hover {
  background: #fff;
  box-shadow: 0 0 20px rgba(255,255,255,0.8);
  transform: translateX(-50%) scale(1.8);
}
.milestone-dot.active {
  background: #ffcc66;
  box-shadow: 0 0 22px rgba(255,200,80,0.9);
  transform: translateX(-50%) scale(1.6);
}
.milestone-dot.past {
  background: rgba(255,255,255,0.5);
  box-shadow: 0 0 10px rgba(255,255,255,0.2);
}
.milestone-label {
  position: absolute;
  top: 18px;
  font-size: 0.62rem;
  font-weight: 500;
  color: rgba(255,255,255,0.5);
  transform: translateX(-50%);
  white-space: nowrap;
  pointer-events: none;
  transition: color 0.3s;
}
.milestone-dot:hover + .milestone-label {
  color: #fff;
}

.timeline-track {
  position: relative;
  height: 2px;
  background: rgba(255,255,255,0.06);
  border-radius: 1px;
}
.timeline-progress {
  position: absolute;
  inset: 0;
  width: 50%;
  background: linear-gradient(90deg, #4a8fcc, #e0604a);
  border-radius: 1px;
  transition: width 0.05s linear;
}
.slider-thumb {
  position: absolute;
  top: 50%; left: 50%;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: #fff;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 20px rgba(255,255,255,0.5);
  pointer-events: none;
  z-index: 3;
}

#timeline {
  position: absolute;
  top: -16px; left: 0; right: 0;
  height: 34px;
  width: 100%;
  opacity: 0;
  cursor: pointer;
  z-index: 4;
  margin: 0;
}

.timeline-labels {
  position: relative;
  height: 20px;
  margin-top: 8px;
  font-size: 0.6rem;
  color: var(--text-dim);
  letter-spacing: 0.05em;
}
.timeline-labels span {
  position: absolute;
  transform: translateX(-50%);
}

/* Buttons */

.buttons-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.ctrl-btn {
  width: 38px; height: 38px;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 50%;
  background: var(--surface);
  color: var(--text);
  font-size: 0.85rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.2s, background 0.2s, transform 0.15s;
}
.ctrl-btn:hover {
  border-color: rgba(255,255,255,0.3);
  background: rgba(255,255,255,0.06);
  transform: scale(1.08);
}
.ctrl-btn.playing {
  border-color: var(--danger);
  color: var(--danger);
}
.ctrl-btn.active {
  border-color: rgba(255,255,255,0.25);
  color: var(--text-dim);
}

#speed-label {
  font-size: 0.65rem;
  color: var(--text-dim);
  margin-left: 4px;
  min-width: 60px;
}

/* ── Footer ─────────────────────────────────────────────── */

.footer {
  position: fixed;
  bottom: 20px; right: 40px;
  font-size: 0.55rem;
  color: var(--text-dim);
  z-index: 10;
  pointer-events: none;
}


/* ── Milestone cinematic overlay ────────────────────────── */

.cinematic-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 1.2s ease;
}
.cinematic-overlay.visible { opacity: 1; pointer-events: auto; }

.cinematic-close {
  position: fixed;
  top: 28px; right: 32px;
  z-index: 102;
  width: 40px; height: 40px;
  border: none; background: none;
  cursor: pointer;
  opacity: 0.4;
  transition: opacity 0.5s;
}
.cinematic-close:hover { opacity: 0.8; }
.cinematic-close::before, .cinematic-close::after {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  width: 24px; height: 1px;
  background: #fff;
}
.cinematic-close::before { transform: translate(-50%,-50%) rotate(45deg); }
.cinematic-close::after  { transform: translate(-50%,-50%) rotate(-45deg); }

.cinematic-content {
  position: absolute;
  bottom: 60px;
  left: 48px; right: 48px;
  max-width: 720px;
  opacity: 0;
  transform: translateY(40px);
  transition: all 1.0s cubic-bezier(0.16, 1, 0.3, 1);
  transition-delay: 0.3s;
}
.cinematic-overlay.visible .cinematic-content { opacity: 1; transform: translateY(0); }

.cin-era { display: flex; align-items: baseline; gap: 16px; margin-bottom: 8px; }
.cin-year {
  font-family: 'Noto Serif SC', serif;
  font-size: 5.5rem; font-weight: 300;
  color: #fff; line-height: 1;
  letter-spacing: -0.02em;
}
.cin-type { font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: rgba(255,255,255,0.35);
  padding-bottom: 8px;
}

.cin-title {
  font-family: 'Noto Serif SC', serif;
  font-size: 2.4rem; font-weight: 400;
  color: #fff;
  margin-bottom: 14px;
  letter-spacing: 0.04em;
}

.cin-summary {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.55);
  line-height: 1.7;
  margin-bottom: 20px;
  padding-left: 14px;
  border-left: 1px solid rgba(255,255,255,0.12);
  max-width: 600px;
}

.cin-narrative {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.35);
  line-height: 1.9;
  margin-bottom: 28px;
  max-width: 620px;
}

.cin-co2 { display: flex; flex-wrap: wrap; align-items: center; gap: 18px; margin-bottom: 18px; }
.cin-co2-bars { display: flex; align-items: center; gap: 10px; }
.cin-co2-bar-group { display: flex; flex-direction: column; gap: 4px; }
.cin-co2-label { font-size: 0.65rem; color: rgba(255,255,255,0.3); }
.cin-co2-track {
  width: 80px; height: 3px;
  background: rgba(255,255,255,0.06);
  border-radius: 2px; overflow: hidden;
}
.cin-co2-fill { height: 100%; border-radius: 2px; transition: width 0.6s ease; }
.cin-co2-fill.before { background: #4a8fcc; }
.cin-co2-fill.after  { background: #d4745c; }
.cin-co2-arrow { font-size: 0.65rem; color: rgba(255,255,255,0.2); }

.cin-co2-stats { display: flex; align-items: center; gap: 10px; font-size: 0.75rem; color: rgba(255,255,255,0.3); }
.cin-co2-stats b { color: rgba(255,255,255,0.55); font-weight: 500; }
.cin-co2-divider { color: rgba(255,255,255,0.1); }

.cin-consequence { font-size: 0.75rem; color: rgba(255,255,255,0.22); font-style: italic; }

.cin-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.cin-tags .tag {
  font-size: 0.65rem;
  padding: 3px 10px;
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 12px;
  color: rgba(255,255,255,0.25);
  letter-spacing: 0.04em;
}

/* ── Responsive ─────────────────────────────────────────── */

@media (max-width: 768px) {
  .header { padding: 16px 16px 0; }
  #year-display { font-size: 3.5rem; }
  #co2-display { font-size: 1.4rem; }
  .controls { padding: 0 20px 28px; }
    .header-right { flex-direction: column; gap: 8px; }


  .hint { top: 80px; right: 20px; font-size: 0.55rem; }
  .footer { bottom: 12px; right: 20px; }
  .milestone-label { display: none; }

  .cinematic-content { left: 24px; right: 24px; bottom: 40px; }
    padding: 28px 22px;
    max-width: 95%;
    border-radius: 16px;
  }
  .cin-year { font-size: 3.5rem; }
  .cin-title { font-size: 1.6rem; }
  .cin-narrative { font-size: 0.82rem; }
}/* ── Rotate toggle ──────────────────────────────────────── */

.rotate-toggle {
  position: fixed;
  top: 36px; right: 40px;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 28px;
  background: rgba(8,8,30,0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  cursor: pointer;
  transition: border-color 0.25s, background 0.25s;
  pointer-events: auto;
}
.rotate-toggle:hover {
  border-color: rgba(255,255,255,0.35);
  background: rgba(8,8,30,0.9);
}

.rotate-label {
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.rotate-state {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  padding: 3px 10px;
  border-radius: 12px;
  min-width: 42px;
  text-align: center;
  transition: all 0.25s ease;
}
.rotate-state.on {
  background: rgba(110,181,255,0.18);
  color: #6eb5ff;
  box-shadow: 0 0 12px rgba(110,181,255,0.2);
}
.rotate-state.off {
  background: rgba(255,255,255,0.06);
  color: var(--text-dim);
}

.hint {
  position: fixed;
  top: 100px; right: 40px;
  font-size: 0.65rem;
  color: var(--text-dim);
  text-align: right;
  line-height: 1.8;
  z-index: 10;
  pointer-events: none;
}
.hint kbd {
  display: inline-block;
  padding: 1px 6px;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 3px;
  font-family: inherit;
  font-size: 0.6rem;
  margin: 0 2px;
}

/* ── Bottom controls ────────────────────────────────────── */

.controls {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  padding: 0 40px 40px;
  z-index: 10;
}

/* Timeline */

.timeline-container {
  position: relative;
  margin-bottom: 20px;
}

.milestones-row {
  position: relative;
  height: 44px;
  margin-bottom: 4px;
}
.milestone-dot {
  position: absolute;
  top: 0;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: rgba(255,255,255,0.35);
  box-shadow: 0 0 6px rgba(255,255,255,0.1);
  transform: translateX(-50%);
  cursor: pointer;
  transition: all 0.3s ease;
  z-index: 2;
}
.milestone-dot:hover {
  background: #fff;
  box-shadow: 0 0 20px rgba(255,255,255,0.8);
  transform: translateX(-50%) scale(1.8);
}
.milestone-dot.active {
  background: #ffcc66;
  box-shadow: 0 0 22px rgba(255,200,80,0.9);
  transform: translateX(-50%) scale(1.6);
}
.milestone-dot.past {
  background: rgba(255,255,255,0.5);
  box-shadow: 0 0 10px rgba(255,255,255,0.2);
}
.milestone-label {
  position: absolute;
  top: 18px;
  font-size: 0.62rem;
  font-weight: 500;
  color: rgba(255,255,255,0.5);
  transform: translateX(-50%);
  white-space: nowrap;
  pointer-events: none;
  transition: color 0.3s;
}
.milestone-dot:hover + .milestone-label {
  color: #fff;
}

.timeline-track {
  position: relative;
  height: 2px;
  background: rgba(255,255,255,0.06);
  border-radius: 1px;
}
.timeline-progress {
  position: absolute;
  inset: 0;
  width: 50%;
  background: linear-gradient(90deg, #4a8fcc, #e0604a);
  border-radius: 1px;
  transition: width 0.05s linear;
}
.slider-thumb {
  position: absolute;
  top: 50%; left: 50%;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: #fff;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 20px rgba(255,255,255,0.5);
  pointer-events: none;
  z-index: 3;
}

#timeline {
  position: absolute;
  top: -16px; left: 0; right: 0;
  height: 34px;
  width: 100%;
  opacity: 0;
  cursor: pointer;
  z-index: 4;
  margin: 0;
}

.timeline-labels {
  position: relative;
  height: 20px;
  margin-top: 8px;
  font-size: 0.6rem;
  color: var(--text-dim);
  letter-spacing: 0.05em;
}
.timeline-labels span {
  position: absolute;
  transform: translateX(-50%);
}

/* Buttons */

.buttons-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.ctrl-btn {
  width: 38px; height: 38px;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 50%;
  background: var(--surface);
  color: var(--text);
  font-size: 0.85rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.2s, background 0.2s, transform 0.15s;
}
.ctrl-btn:hover {
  border-color: rgba(255,255,255,0.3);
  background: rgba(255,255,255,0.06);
  transform: scale(1.08);
}
.ctrl-btn.playing {
  border-color: var(--danger);
  color: var(--danger);
}
.ctrl-btn.active {
  border-color: rgba(255,255,255,0.25);
  color: var(--text-dim);
}

#speed-label {
  font-size: 0.65rem;
  color: var(--text-dim);
  margin-left: 4px;
  min-width: 60px;
}

/* ── Footer ─────────────────────────────────────────────── */

.footer {
  position: fixed;
  bottom: 20px; right: 40px;
  font-size: 0.55rem;
  color: var(--text-dim);
  z-index: 10;
  pointer-events: none;
}


/* ── Milestone cinematic overlay ────────────────────────── */

.cinematic-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 1.2s ease;
}
.cinematic-overlay.visible { opacity: 1; pointer-events: auto; }

.cinematic-close {
  position: fixed;
  top: 28px; right: 32px;
  z-index: 102;
  width: 40px; height: 40px;
  border: none; background: none;
  cursor: pointer;
  opacity: 0.4;
  transition: opacity 0.5s;
}
.cinematic-close:hover { opacity: 0.8; }
.cinematic-close::before, .cinematic-close::after {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  width: 24px; height: 1px;
  background: #fff;
}
.cinematic-close::before { transform: translate(-50%,-50%) rotate(45deg); }
.cinematic-close::after  { transform: translate(-50%,-50%) rotate(-45deg); }

.cinematic-content {
  position: absolute;
  bottom: 60px;
  left: 48px; right: 48px;
  max-width: 720px;
  opacity: 0;
  transform: translateY(40px);
  transition: all 1.0s cubic-bezier(0.16, 1, 0.3, 1);
  transition-delay: 0.3s;
}
.cinematic-overlay.visible .cinematic-content { opacity: 1; transform: translateY(0); }

.cin-era { display: flex; align-items: baseline; gap: 16px; margin-bottom: 8px; }
.cin-year {
  font-family: 'Noto Serif SC', serif;
  font-size: 5.5rem; font-weight: 300;
  color: #fff; line-height: 1;
  letter-spacing: -0.02em;
}
.cin-type { font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: rgba(255,255,255,0.35);
  padding-bottom: 8px;
}

.cin-title {
  font-family: 'Noto Serif SC', serif;
  font-size: 2.4rem; font-weight: 400;
  color: #fff;
  margin-bottom: 14px;
  letter-spacing: 0.04em;
}

.cin-summary {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.55);
  line-height: 1.7;
  margin-bottom: 20px;
  padding-left: 14px;
  border-left: 1px solid rgba(255,255,255,0.12);
  max-width: 600px;
}

.cin-narrative {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.35);
  line-height: 1.9;
  margin-bottom: 28px;
  max-width: 620px;
}

.cin-co2 { display: flex; flex-wrap: wrap; align-items: center; gap: 18px; margin-bottom: 18px; }
.cin-co2-bars { display: flex; align-items: center; gap: 10px; }
.cin-co2-bar-group { display: flex; flex-direction: column; gap: 4px; }
.cin-co2-label { font-size: 0.65rem; color: rgba(255,255,255,0.3); }
.cin-co2-track {
  width: 80px; height: 3px;
  background: rgba(255,255,255,0.06);
  border-radius: 2px; overflow: hidden;
}
.cin-co2-fill { height: 100%; border-radius: 2px; transition: width 0.6s ease; }
.cin-co2-fill.before { background: #4a8fcc; }
.cin-co2-fill.after  { background: #d4745c; }
.cin-co2-arrow { font-size: 0.65rem; color: rgba(255,255,255,0.2); }

.cin-co2-stats { display: flex; align-items: center; gap: 10px; font-size: 0.75rem; color: rgba(255,255,255,0.3); }
.cin-co2-stats b { color: rgba(255,255,255,0.55); font-weight: 500; }
.cin-co2-divider { color: rgba(255,255,255,0.1); }

.cin-consequence { font-size: 0.75rem; color: rgba(255,255,255,0.22); font-style: italic; }

.cin-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.cin-tags .tag {
  font-size: 0.65rem;
  padding: 3px 10px;
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 12px;
  color: rgba(255,255,255,0.25);
  letter-spacing: 0.04em;
}

/* ── Responsive ─────────────────────────────────────────── */

@media (max-width: 768px) {
  .header { padding: 20px 20px 0; }
  #year-display { font-size: 3.5rem; }
  #co2-display { font-size: 1.4rem; }
  .controls { padding: 0 20px 28px; }
  .rotate-toggle { top: 50px; right: 20px; }
 padding: 8px 14px; }
  .hint { top: 80px; right: 20px; font-size: 0.55rem; }
  .footer { bottom: 12px; right: 20px; }
  .milestone-label { display: none; }

  .cinematic-content { left: 24px; right: 24px; bottom: 40px; }
    padding: 28px 22px;
    max-width: 95%;
    border-radius: 16px;
  }
  .cin-year { font-size: 3.5rem; }
  .cin-title { font-size: 1.6rem; }
  .cin-narrative { font-size: 0.82rem; }
}/* ── Language nav ──────────────────────────────────────── */

.lang-nav {
  position: relative;
  pointer-events: auto;
}
.lang-nav-btn {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 16px;
  color: rgba(255,255,255,0.7);
  padding: 5px 14px;
  font-size: 0.65rem;
  font-family: inherit;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: all 0.25s;
}
.lang-nav-btn:hover { border-color: rgba(255,255,255,0.5); color: #fff; background: rgba(255,255,255,0.12); }
.lang-nav-menu {
  position: fixed;
  margin-top: 2px;
  background: rgba(12,12,35,0.95);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 10px;
  overflow: hidden;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  z-index: 30;
  min-width: 120px;
}
.lang-nav-menu.open { opacity: 1; pointer-events: auto; }
.lang-nav-item {
  padding: 7px 16px;
  font-size: 0.68rem;
  color: rgba(255,255,255,0.55);
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}
.lang-nav-item:hover { background: rgba(255,255,255,0.08); color: #fff; }
.lang-nav-item.active { color: #fff; background: rgba(255,255,255,0.06); }

.support-btn {
  background: rgba(255,160,40,0.15);
  border-color: rgba(255,160,40,0.3);
  color: rgba(255,180,80,0.9);
}
.ambient-btn { background: rgba(100,200,160,0.12); border-color: rgba(100,200,160,0.25); color: rgba(120,220,170,0.85); }
.ambient-btn:hover { border-color: rgba(100,200,160,0.5); color: #fff; background: rgba(100,200,160,0.2); }
.ambient-btn.active { background: rgba(100,200,160,0.25); border-color: rgba(100,200,160,0.5); color: #fff; box-shadow: 0 0 12px rgba(100,200,160,0.15); }

.support-btn:hover {
  border-color: rgba(255,160,40,0.6);
  color: #fff;
  background: rgba(255,160,40,0.25);
  box-shadow: 0 0 14px rgba(255,160,40,0.12);
}



/* ── Donation ───────────────────────────────────────────── */

.footer-donate {
  cursor: pointer;
  color: rgba(255,255,255,0.4);
  transition: color 0.3s;
  pointer-events: auto;
}
.footer-donate:hover { color: #fff; }

.donate-overlay {
  position: fixed;
  inset: 0;
  z-index: 110;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.6s ease;
}
.donate-overlay.visible { opacity: 1; pointer-events: auto; }

.donate-card {
  background: rgba(12,12,35,0.95);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 20px;
  padding: 48px;
  text-align: center;
  max-width: 460px;
  width: 90%;
  position: relative;
}
.donate-title {
  font-family: 'Noto Serif SC', serif;
  font-size: 1.8rem;
  font-weight: 300;
  color: #fff;
  margin-bottom: 8px;
}
.donate-desc {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.4);
  margin-bottom: 32px;
  line-height: 1.6;
}
.donate-methods {
  display: flex;
  gap: 24px;
  justify-content: center;
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.donate-method {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 0.7rem;
  color: rgba(255,255,255,0.4);
}
.donate-qr {
  width: 140px; height: 140px;
  border-radius: 12px;
  overflow: hidden;
}
.donate-qr img { width: 100%; height: 100%; object-fit: contain; }

.donate-kofi-btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 12px;
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.25s;
  background: #29abe0;
  color: #fff;
}
.donate-kofi-btn:hover { background: #1e8ab8; }

.donate-footnote {
  font-size: 0.6rem;
  color: rgba(255,255,255,0.2);
  margin-top: 8px;
}



/* ── Ambient mode ───────────────────────────────────────── */

.ambient-subtitle {
  position: fixed;
  bottom: 120px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 50;
  display: flex;
  align-items: baseline;
  gap: 16px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 2s ease;
}
.ambient-subtitle.visible { opacity: 1; }

.ambient-year {
  font-family: 'Noto Serif SC', serif;
  font-size: 2.5rem;
  font-weight: 300;
  color: rgba(255,255,255,0.8);
  letter-spacing: -0.02em;
}
.ambient-label {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.4);
  letter-spacing: 0.1em;
}



/* ── Ambient mode — hide all UI ─────────────────────────── */
.ambient-mode .header,
.ambient-mode .rotate-toggle,
.ambient-mode .lang-nav,
.ambient-mode .support-btn,
.ambient-mode .ambient-btn,
.ambient-mode .hint,
.ambient-mode .controls,
.ambient-mode .footer,
.ambient-mode .cinematic-overlay,
.ambient-mode .city-popup,
.ambient-mode .donate-overlay {
  opacity: 0 !important;
  pointer-events: none !important;
  transition: opacity 1.5s ease;
}