:root {
  --bg: #0a0a1a;
  --bg-soft: rgba(15, 18, 35, 0.65);
  --panel: rgba(20, 24, 45, 0.55);
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.18);
  --text: #e8ecf5;
  --text-dim: #9aa3bd;
  --accent: #7ee8c9;
  --accent-soft: #5db8ff;
  --warm: #ffd29c;
  --danger: #ff7a8a;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --radius: 14px;
  --radius-sm: 10px;
}

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

html,
body {
  width: 100%;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    "Segoe UI", Roboto, sans-serif;
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
}

#canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  outline: none;
  background: linear-gradient(180deg, #0f1441 0%, #2a1a4a 50%, #1a2d3a 100%);
}

/* ---------- 通用遮罩 ---------- */
.overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at center, rgba(10, 10, 30, 0.85), rgba(5, 5, 15, 0.95));
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 100;
  transition: opacity 0.8s ease;
}
.overlay.hidden {
  opacity: 0;
  pointer-events: none;
  visibility: hidden;
}

/* ---------- 加载页 ---------- */
.loading-content {
  text-align: center;
  max-width: 480px;
  padding: 20px;
}
.loading-content h1 {
  font-size: 28px;
  font-weight: 300;
  letter-spacing: 4px;
  margin-top: 30px;
  background: linear-gradient(120deg, #7ee8c9, #5db8ff, #c5a3ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.tagline {
  font-size: 13px;
  color: var(--text-dim);
  margin-top: 10px;
  letter-spacing: 2px;
}
.progress {
  width: 240px;
  height: 2px;
  margin: 30px auto 12px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
  overflow: hidden;
}
.progress-bar {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, #7ee8c9, #5db8ff);
  transition: width 0.4s ease;
}
.hint {
  font-size: 11px;
  color: rgba(255, 255, 255, 0.4);
  letter-spacing: 1px;
}

/* 曼陀罗加载动画 */
.mandala {
  position: relative;
  width: 80px;
  height: 80px;
  margin: 0 auto;
}
.mandala span {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 8px;
  height: 24px;
  margin-left: -4px;
  margin-top: -12px;
  background: linear-gradient(180deg, #7ee8c9, transparent);
  border-radius: 4px;
  transform-origin: 4px 12px;
  animation: spin 2s linear infinite;
}
.mandala span:nth-child(2) { animation-delay: -0.15s; transform: rotate(60deg); background: linear-gradient(180deg, #5db8ff, transparent); }
.mandala span:nth-child(3) { animation-delay: -0.3s; transform: rotate(120deg); }
.mandala span:nth-child(4) { animation-delay: -0.45s; transform: rotate(180deg); }
.mandala span:nth-child(5) { animation-delay: -0.6s; transform: rotate(240deg); background: linear-gradient(180deg, #c5a3ff, transparent); }
.mandala span:nth-child(6) { animation-delay: -0.75s; transform: rotate(300deg); }
@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ---------- 欢迎页 ---------- */
.welcome-content {
  max-width: 720px;
  padding: 30px 40px;
  text-align: center;
}
.logo {
  position: relative;
  width: 110px;
  height: 110px;
  margin: 0 auto 20px;
}
.logo-ring {
  position: absolute;
  inset: 0;
  border: 2px solid rgba(126, 232, 201, 0.3);
  border-top-color: #7ee8c9;
  border-radius: 50%;
  animation: rotate 6s linear infinite;
}
.logo-core {
  position: absolute;
  inset: 22px;
  background: radial-gradient(circle, #7ee8c9, #5db8ff);
  border-radius: 50%;
  box-shadow: 0 0 60px rgba(126, 232, 201, 0.6);
  animation: pulse 3s ease-in-out infinite;
}
@keyframes rotate { to { transform: rotate(360deg); } }
@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.85; }
  50% { transform: scale(1.08); opacity: 1; }
}

.welcome-content h1 {
  font-size: 36px;
  font-weight: 300;
  letter-spacing: 6px;
  margin-bottom: 10px;
}
.subtitle {
  font-size: 14px;
  color: var(--text-dim);
  letter-spacing: 4px;
  margin-bottom: 35px;
}
.instructions {
  display: flex;
  gap: 30px;
  justify-content: center;
  margin: 30px 0;
  text-align: left;
}
.control-col {
  flex: 1;
  max-width: 280px;
}
.control-col h3 {
  font-size: 12px;
  letter-spacing: 3px;
  color: var(--accent);
  margin-bottom: 12px;
  font-weight: 400;
  text-transform: uppercase;
}
.control-col ul {
  list-style: none;
}
.control-col li {
  font-size: 13px;
  color: var(--text-dim);
  padding: 6px 0;
  border-bottom: 1px dashed var(--border);
}
kbd {
  display: inline-block;
  padding: 1px 7px;
  margin: 0 2px;
  font-size: 11px;
  font-family: monospace;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  color: var(--text);
}
.awareness {
  margin: 25px 0;
}
.aware {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-dim);
  cursor: pointer;
}
.aware input { accent-color: var(--accent); }
.primary-btn {
  position: relative;
  padding: 14px 50px;
  background: linear-gradient(135deg, rgba(126, 232, 201, 0.15), rgba(93, 184, 255, 0.15));
  color: var(--text);
  border: 1px solid var(--accent);
  border-radius: 30px;
  font-size: 14px;
  letter-spacing: 4px;
  cursor: pointer;
  transition: all 0.3s ease;
  overflow: hidden;
}
.primary-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.primary-btn:not(:disabled):hover {
  background: linear-gradient(135deg, rgba(126, 232, 201, 0.3), rgba(93, 184, 255, 0.3));
  box-shadow: 0 0 40px rgba(126, 232, 201, 0.4);
  transform: translateY(-1px);
}
.foot-tip {
  margin-top: 20px;
  font-size: 11px;
  color: rgba(255, 255, 255, 0.4);
  letter-spacing: 1px;
}

/* ---------- HUD ---------- */
#hud { position: fixed; inset: 0; pointer-events: none; z-index: 50; }
#hud.hidden { display: none; }
#hud * { pointer-events: auto; }

.top-bar {
  position: absolute;
  top: 16px;
  left: 16px;
  right: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 2;
}
.title-pill, .status-pill {
  padding: 8px 16px;
  background: var(--panel);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 13px;
  letter-spacing: 1px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.title-pill .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}
.status-pill {
  margin-left: auto;
  font-family: monospace;
  font-size: 12px;
  color: var(--text-dim);
}
.status-pill .sep { opacity: 0.4; }
.icon-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 16px;
  cursor: pointer;
  transition: transform 0.3s;
}
.icon-btn:hover { transform: rotate(180deg); }

/* ---------- 控制面板 ---------- */
.panel-stack {
  position: absolute;
  right: 16px;
  top: 70px;
  bottom: 20px;
  width: 280px;
  overflow-y: auto;
  padding-right: 6px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.2) transparent;
  transition: transform 0.4s ease;
}
.panel-stack.collapsed { transform: translateX(110%); }
.panel-stack::-webkit-scrollbar { width: 4px; }
.panel-stack::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 2px; }

.panel {
  background: var(--panel);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  box-shadow: var(--shadow);
}
.panel header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.panel-ico { font-size: 14px; }
.panel h3 {
  font-size: 12px;
  letter-spacing: 2px;
  font-weight: 400;
  color: var(--text);
}

.btn-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}
.btn-group.compact {
  grid-template-columns: 1fr 1fr 1fr;
}
.btn-group button {
  padding: 8px 6px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
}
.btn-group button:hover {
  background: rgba(126, 232, 201, 0.08);
  border-color: var(--accent);
  color: var(--text);
}
.btn-group button.active {
  background: linear-gradient(135deg, rgba(126, 232, 201, 0.2), rgba(93, 184, 255, 0.15));
  border-color: var(--accent);
  color: var(--text);
  box-shadow: inset 0 0 12px rgba(126, 232, 201, 0.1);
}

.audio-controls { display: flex; flex-direction: column; gap: 10px; }
.pill-btn {
  padding: 8px 16px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  color: var(--text);
  font-size: 12px;
  letter-spacing: 2px;
  cursor: pointer;
  transition: all 0.2s;
}
.pill-btn:hover { border-color: var(--accent); }
.pill-btn.primary {
  background: linear-gradient(135deg, rgba(126, 232, 201, 0.2), rgba(93, 184, 255, 0.15));
  border-color: var(--accent);
}
.pill-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.slider-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  color: var(--text-dim);
}
.slider-row label { width: 32px; }
.slider-row input[type="range"] {
  flex: 1;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}
.slider-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px rgba(126, 232, 201, 0.5);
}
.slider-row input[type="range"]::-moz-range-thumb {
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: none;
}

.timer-display {
  text-align: center;
  font-family: monospace;
  font-size: 32px;
  letter-spacing: 4px;
  color: var(--accent);
  padding: 10px 0;
  text-shadow: 0 0 20px rgba(126, 232, 201, 0.4);
}
.timer-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  margin-top: 10px;
}
.presets-tip {
  font-size: 11px;
  color: var(--text-dim);
  text-align: center;
  margin-top: 10px;
  letter-spacing: 1px;
}

/* ---------- 呼吸引导 ---------- */
#breath-guide {
  position: absolute;
  left: 50%;
  bottom: 80px;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  pointer-events: none;
}
.breath-ring {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  box-shadow: 0 0 40px rgba(126, 232, 201, 0.4), inset 0 0 40px rgba(126, 232, 201, 0.1);
}
.breath-text {
  margin-top: 16px;
  font-size: 18px;
  letter-spacing: 6px;
  color: var(--text);
  text-shadow: 0 0 20px rgba(126, 232, 201, 0.6);
}

#bell-indicator {
  position: absolute;
  left: 50%;
  top: 30%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  pointer-events: none;
}
.bell-ring {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  border: 2px solid var(--warm);
  animation: bell 3s ease-out infinite;
}
#bell-indicator p {
  margin-top: 30px;
  font-size: 16px;
  letter-spacing: 6px;
  color: var(--warm);
}
@keyframes bell {
  0% { transform: scale(0.6); opacity: 0; }
  20% { transform: scale(1.4); opacity: 1; }
  100% { transform: scale(2); opacity: 0; }
}

/* ---------- VR ---------- */
#vr-container {
  position: fixed;
  bottom: 20px;
  left: 20px;
  z-index: 60;
}
#vr-container button {
  padding: 10px 20px;
  background: linear-gradient(135deg, #7ee8c9, #5db8ff);
  color: #0a0a1a;
  border: none;
  border-radius: 8px;
  font-weight: bold;
  cursor: pointer;
  letter-spacing: 2px;
}
#vr-container button:disabled {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-dim);
  cursor: not-allowed;
}

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
  .welcome-content { padding: 20px; }
  .welcome-content h1 { font-size: 24px; letter-spacing: 4px; }
  .instructions { flex-direction: column; gap: 16px; }
  .panel-stack { width: 240px; }
  .control-col { max-width: none; }
}