:root {
  --bg: #04070f;
  --panel-bg: rgba(9, 15, 28, 0.62);
  --panel-border: rgba(140, 170, 220, 0.16);
  --text: #e8eef7;
  --text-dim: #9fb0c8;
  --accent: #ffc857;
  --accent-2: #6ee7ff;
}

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

html, body {
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

#globe-container {
  position: fixed;
  inset: 0;
}

.panel {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

/* ---------- Header ---------- */
#header {
  position: fixed;
  top: 20px;
  left: 20px;
  padding: 16px 22px;
  max-width: 380px;
  pointer-events: none;
}

#header h1 {
  font-size: 1.5rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: linear-gradient(100deg, var(--accent) 20%, var(--accent-2) 80%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

#header .subtitle {
  margin-top: 4px;
  font-size: 0.85rem;
  color: var(--text-dim);
}

#header .hint {
  margin-top: 10px;
  font-size: 0.72rem;
  color: var(--text-dim);
  opacity: 0.85;
}

/* ---------- Counter ---------- */
#counter {
  position: fixed;
  top: 20px;
  right: 20px;
  padding: 10px 16px;
  font-size: 0.82rem;
  color: var(--text-dim);
}

#counter b { color: var(--accent); font-weight: 600; }

/* ---------- Chọn quốc gia ---------- */
#country-panel {
  position: fixed;
  top: 68px;
  right: 20px;
  width: 258px;
  padding: 12px 14px;
  z-index: 15;
}

#country-panel label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.66rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-dim);
}

#country-select {
  width: 100%;
  padding: 7px 10px;
  font-size: 0.82rem;
  color: var(--text);
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  outline: none;
  cursor: pointer;
}

#country-select option { background: #0b1322; color: var(--text); }

#country-events {
  margin-top: 10px;
  max-height: 42vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 2px;
  scrollbar-width: thin;
}

.country-ev {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 6px 8px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s;
}

.country-ev:hover { background: rgba(255, 255, 255, 0.08); }

.country-ev .ev-year {
  flex: 0 0 78px;
  font-size: 0.68rem;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.country-ev .ev-title { font-size: 0.78rem; line-height: 1.35; }

/* Sự kiện chưa diễn ra tại mốc thời gian đang chọn */
.country-ev.future { opacity: 0.4; }

/* ---------- Tooltip ---------- */
#tooltip {
  position: fixed;
  z-index: 30;
  pointer-events: none;
  background: rgba(8, 13, 25, 0.92);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 7px 11px;
  font-size: 0.8rem;
  max-width: 240px;
  transform: translate(14px, -50%);
}

#tooltip .tt-year { color: var(--accent); font-size: 0.7rem; display: block; }

/* ---------- Timeline ---------- */
#timeline {
  position: fixed;
  left: 50%;
  bottom: 22px;
  transform: translateX(-50%);
  width: min(940px, 94vw);
  padding: 12px 18px 16px;
  z-index: 20;
}

#era-buttons {
  display: flex;
  gap: 6px;
  justify-content: center;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

#era-buttons button {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid transparent;
  color: var(--text-dim);
  font-size: 0.72rem;
  padding: 4px 12px;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.18s;
}

#era-buttons button:hover { color: var(--text); background: rgba(255, 255, 255, 0.1); }

#era-buttons button.active {
  color: #0a0f1c;
  background: var(--accent);
  font-weight: 600;
}

.slider-row {
  display: flex;
  align-items: center;
  gap: 14px;
}

#play-btn {
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--panel-border);
  background: rgba(255, 255, 255, 0.06);
  color: var(--accent);
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.18s;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-left: 3px;
}

#play-btn.playing { padding-left: 0; }
#play-btn:hover { background: rgba(255, 200, 87, 0.18); transform: scale(1.06); }

.track-wrap {
  position: relative;
  flex: 1;
  padding-top: 12px;
}

#ticks {
  position: absolute;
  top: 0;
  left: 9px;
  right: 9px;
  height: 10px;
}

.tick {
  position: absolute;
  top: 2px;
  width: 6px;
  height: 6px;
  margin-left: -3px;
  border-radius: 50%;
  background: rgba(160, 190, 230, 0.4);
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
}

.tick:hover { background: var(--accent-2); transform: scale(1.6); }
.tick.passed { background: var(--accent); }

#time-slider {
  width: 100%;
  height: 22px;
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  cursor: pointer;
}

#time-slider::-webkit-slider-runnable-track {
  height: 6px;
  border-radius: 3px;
  background: var(--track-bg, rgba(255, 255, 255, 0.14));
}

#time-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  margin-top: -6px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--accent);
  box-shadow: 0 0 12px rgba(255, 200, 87, 0.7);
}

#time-slider::-moz-range-track {
  height: 6px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.14);
}

#time-slider::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--accent);
  box-shadow: 0 0 12px rgba(255, 200, 87, 0.7);
}

#year-label {
  flex: 0 0 auto;
  min-width: 150px;
  text-align: right;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

/* ---------- Modal ---------- */
#modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  background: rgba(2, 5, 12, 0.72);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

#modal {
  position: relative;
  width: min(680px, 94vw);
  max-height: 92vh;
  overflow-y: auto;
  background: #0b1322;
  border: 1px solid var(--panel-border);
  border-radius: 18px;
  padding: 24px 26px;
  animation: modal-in 0.28s cubic-bezier(0.2, 0.9, 0.3, 1.2);
}

@keyframes modal-in {
  from { opacity: 0; transform: scale(0.93) translateY(14px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

#modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--panel-border);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-dim);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.15s;
}

#modal-close:hover { color: #fff; background: rgba(255, 255, 255, 0.14); }

#modal-head { margin-bottom: 16px; padding-right: 40px; }

.badge {
  display: inline-block;
  background: rgba(255, 200, 87, 0.14);
  color: var(--accent);
  border: 1px solid rgba(255, 200, 87, 0.35);
  font-size: 0.74rem;
  font-weight: 600;
  padding: 3px 11px;
  border-radius: 999px;
  margin-bottom: 8px;
}

#modal-title { font-size: 1.45rem; line-height: 1.25; }

#modal-location {
  margin-top: 5px;
  color: var(--text-dim);
  font-size: 0.82rem;
}

#modal-canvas {
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: 12px;
  background: #060b16;
  display: block;
}

#modal-desc {
  margin-top: 16px;
  font-size: 0.95rem;
  line-height: 1.65;
  color: #c9d6e8;
}

/* ---------- Loading ---------- */
#loading {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  color: var(--text-dim);
  font-size: 0.9rem;
  transition: opacity 0.6s;
}

#loading.fade { opacity: 0; pointer-events: none; }

.spinner {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 3px solid rgba(255, 255, 255, 0.12);
  border-top-color: var(--accent);
  animation: spin 0.9s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.hidden { display: none !important; }

/* ---------- Mobile ---------- */
@media (max-width: 640px) {
  /* Stack header / counter / country selector in normal flow instead of
     independently-positioned fixed boxes, so they can never overlap
     regardless of how much the title/subtitle text wraps. */
  #top-overlay {
    position: fixed;
    top: 12px;
    left: 12px;
    right: 12px;
    z-index: 15;
    display: flex;
    flex-direction: column;
    gap: 8px;
  }

  #header, #counter, #country-panel {
    position: static;
    top: auto;
    left: auto;
    right: auto;
    width: auto;
    max-width: none;
  }

  #header { padding: 12px 14px; }
  #header h1 { font-size: 1.05rem; }
  #header .hint { display: none; }
  #counter { align-self: flex-start; padding: 8px 12px; font-size: 0.72rem; }
  #year-label { min-width: 108px; font-size: 0.85rem; }
  #timeline { padding: 10px 12px 12px; }
  #country-panel { padding: 10px; }
  #country-events { max-height: 26vh; }
}