:root {
  --bg: #f1f5f9;
  --card: #ffffff;
  --text: #0f172a;
  --border: #cbd5e1;
  --primary: #2563eb;
}

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

body {
  font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  background-color: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 12px;
}

.stage-container {
  width: 100%;
  max-width: 680px;
  background: var(--card);
  border-radius: 16px;
  border: 1px solid var(--border);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* 頂部狀態列 */
.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.phase-pill {
  font-size: 0.95rem;
  font-weight: 800;
  padding: 5px 14px;
  border-radius: 999px;
  background: #fef3c7;
  color: #92400e;
}

.valve-pills {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.v-pill {
  font-size: 0.82rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 999px;
  background: #fef3c7;
  color: #78350f;
  border: 1.5px solid #d97706;
}

/* 畫布區 */
.canvas-box {
  position: relative;
  width: 100%;
  aspect-ratio: 600 / 580;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  overflow: hidden;
}

#heartSvg {
  width: 100%;
  height: 100%;
  display: block;
}

/* 統一瓣膜外觀顏色：始終維持一致的韌帶瓣膜色，不隨開關變紅綠，避免視覺錯亂 */
.valve-leaflet {
  fill: none;
  stroke: #b45309;
  stroke-width: 6.5;
  stroke-linecap: round;
}

.valve-hinge {
  fill: #fef3c7;
  stroke: #78350f;
  stroke-width: 2.5;
}

.hidden-arrow {
  opacity: 0;
  transition: opacity 0.2s ease;
}

.mini-legend {
  position: absolute;
  bottom: 8px;
  left: 10px;
  right: 10px;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(4px);
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid #e2e8f0;
  font-size: 0.78rem;
  font-weight: 700;
  color: #334155;
}

.dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-right: 4px;
  vertical-align: middle;
}

.dot-blue { background: #2563eb; }
.dot-red { background: #dc2626; }
.dot-valve { background: #b45309; border: 2px solid #fef3c7; }

/* 底部控制列 */
.bottom-controls {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.ctrl-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.btn-group {
  display: flex;
  gap: 6px;
}

.btn-primary,
.btn-secondary {
  cursor: pointer;
  border-radius: 8px;
  padding: 6px 12px;
  font-size: 0.84rem;
  font-weight: 700;
  border: none;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-secondary {
  background: #e2e8f0;
  color: #1e293b;
}

.phase-tabs {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.phase-tab {
  cursor: pointer;
  border: 1px solid #cbd5e1;
  background: #fff;
  color: #334155;
  padding: 5px 10px;
  border-radius: 8px;
  font-size: 0.78rem;
  font-weight: 700;
  transition: all 0.15s ease;
}

.phase-tab.active {
  background: #1e293b;
  color: #fff;
  border-color: #1e293b;
}

.speed-box {
  font-size: 0.82rem;
  font-weight: 600;
  color: #475569;
  display: flex;
  align-items: center;
  gap: 4px;
}

.speed-box select {
  padding: 4px 6px;
  border-radius: 6px;
  border: 1px solid #cbd5e1;
  font-weight: 700;
}

.slider-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

#cycleSlider {
  flex: 1;
  cursor: pointer;
  accent-color: var(--primary);
}

.time-readout {
  font-size: 0.82rem;
  color: #475569;
  font-variant-numeric: tabular-nums;
  min-width: 85px;
  text-align: right;
}