:root {
  --bg-dark: #060913;
  --panel-bg: rgba(11, 17, 30, 0.93);
  --panel-border: rgba(94, 176, 255, 0.22);
  --text-main: #eef5ff;
  --text-muted: #93a8c7;
  --accent-cyan: #38bdf8;
  --accent-blue: #60a5fa;
  --accent-purple: #c084fc;
  --accent-muscle: #fb7185;
  --accent-gland: #2dd4bf;
  --accent-gold: #fbbf24;
  --shadow-glow: 0 12px 32px rgba(0, 0, 0, 0.55);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  user-select: none;
  -webkit-user-select: none;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg-dark);
  font-family: var(--font-sans);
  color: var(--text-main);
}

#canvas-container {
  position: fixed;
  inset: 0;
  z-index: 1;
  background: radial-gradient(circle at 50% 45%, #111b30 0%, #070b16 68%, #03050a 100%);
}

/* Floating 3D Pin Labels */
#labels-layer {
  position: fixed;
  inset: 0;
  z-index: 4;
  pointer-events: none;
  overflow: hidden;
}

.pin-label {
  position: absolute;
  transform: translate(-50%, -100%);
  pointer-events: auto;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(8, 14, 26, 0.86);
  border: 1px solid rgba(125, 211, 252, 0.42);
  color: #f0f9ff;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.55);
  transition: transform 0.16s ease, border-color 0.2s ease, background 0.2s ease, opacity 0.2s ease;
  white-space: nowrap;
}

.pin-label::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 50%;
  transform: translateX(-50%);
  border-width: 6px 5px 0 5px;
  border-style: solid;
  border-color: rgba(125, 211, 252, 0.55) transparent transparent transparent;
}

.pin-label:hover,
.pin-label.active {
  transform: translate(-50%, -108%) scale(1.06);
  background: rgba(14, 28, 52, 0.96);
  border-color: var(--accent-gold);
  color: #ffffff;
  z-index: 10;
}

.pin-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 8px currentColor;
}

/* Hover Tooltip */
.hover-tooltip {
  position: fixed;
  z-index: 30;
  pointer-events: none;
  background: rgba(8, 13, 25, 0.94);
  border: 1px solid rgba(56, 189, 248, 0.55);
  color: #f8fafc;
  padding: 6px 11px;
  border-radius: 8px;
  font-size: 12.5px;
  font-weight: 500;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.6);
  transform: translate(14px, 14px);
  transition: opacity 0.12s ease;
}

.hover-tooltip.hidden {
  opacity: 0;
  visibility: hidden;
}

/* Top HUD Header */
.hud-header {
  position: fixed;
  top: 12px;
  left: 16px;
  right: 16px;
  z-index: 12;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 16px;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  box-shadow: var(--shadow-glow);
}

.brand-box {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-badge {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.13);
  border: 1px solid rgba(56, 189, 248, 0.35);
  padding: 2px 8px;
  border-radius: 999px;
}

.brand-title {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.01em;
  background: linear-gradient(90deg, #ffffff 0%, #bae6fd 55%, #5eead4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-subtitle {
  font-size: 12px;
  color: var(--text-muted);
}

.pathway-switcher {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.mode-tab {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border-radius: 10px;
  border: 1px solid rgba(148, 163, 184, 0.22);
  background: rgba(15, 23, 42, 0.72);
  color: var(--text-main);
  cursor: pointer;
  transition: all 0.18s ease;
  text-align: left;
}

.mode-tab:hover {
  border-color: rgba(56, 189, 248, 0.5);
  background: rgba(30, 41, 59, 0.88);
}

.mode-tab.active {
  background: linear-gradient(135deg, rgba(14, 116, 144, 0.45), rgba(30, 58, 138, 0.55));
  border-color: var(--accent-cyan);
  box-shadow: 0 0 16px rgba(56, 189, 248, 0.25);
}

.mode-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
}

.dual-dot { background: #38bdf8; box-shadow: 0 0 8px #38bdf8; }
.muscle-dot { background: #fb7185; box-shadow: 0 0 8px #fb7185; }
.gland-dot { background: #2dd4bf; box-shadow: 0 0 8px #2dd4bf; }
.synapse-dot { background: #fbbf24; box-shadow: 0 0 8px #fbbf24; }

.mode-text {
  display: flex;
  flex-direction: column;
}

.mode-name {
  font-size: 12.5px;
  font-weight: 700;
}

.mode-en {
  font-size: 10px;
  color: var(--text-muted);
}

/* Left Control Sidebar */
.control-sidebar {
  position: fixed;
  top: 88px;
  left: 16px;
  bottom: 84px;
  width: 270px;
  z-index: 10;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 12px;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  box-shadow: var(--shadow-glow);
  overflow-y: auto;
}

.control-sidebar::-webkit-scrollbar,
.node-list::-webkit-scrollbar,
.info-panel::-webkit-scrollbar {
  width: 5px;
}

.control-sidebar::-webkit-scrollbar-thumb,
.node-list::-webkit-scrollbar-thumb,
.info-panel::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 184, 0.28);
  border-radius: 99px;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 6px;
  border-bottom: 1px solid rgba(148, 163, 184, 0.16);
}

.sidebar-title {
  font-size: 13.5px;
  font-weight: 700;
  color: #e2e8f0;
}

.btn-reset-focus {
  padding: 4px 10px;
  font-size: 11.5px;
  font-weight: 600;
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.36);
  border-radius: 7px;
  cursor: pointer;
  transition: all 0.16s ease;
}

.btn-reset-focus:hover {
  background: rgba(56, 189, 248, 0.25);
  color: #fff;
}

.section-caption {
  font-size: 11px;
  font-weight: 700;
  color: var(--accent-cyan);
  letter-spacing: 0.03em;
  margin-bottom: 6px;
}

/* Trigger Buttons */
.trigger-grid {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.trigger-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 7px;
}

.trigger-btn {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid rgba(148, 163, 184, 0.28);
  background: rgba(15, 23, 42, 0.78);
  color: var(--text-main);
  cursor: pointer;
  text-align: left;
  transition: transform 0.12s ease, border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.trigger-btn:hover {
  transform: translateY(-1px);
}

.trigger-btn:active {
  transform: translateY(1px) scale(0.985);
}

.t-icon {
  font-size: 18px;
  flex-shrink: 0;
}

.t-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
}

.t-text strong {
  font-size: 12px;
  font-weight: 700;
  color: #f8fafc;
}

.t-text small {
  font-size: 10.5px;
  color: var(--text-muted);
  line-height: 1.25;
}

.primary-trigger {
  background: linear-gradient(135deg, rgba(14, 116, 144, 0.36), rgba(30, 64, 175, 0.36));
  border-color: rgba(56, 189, 248, 0.55);
}
.primary-trigger:hover {
  box-shadow: 0 0 18px rgba(56, 189, 248, 0.35);
  border-color: #7dd3fc;
}

.brain-trigger {
  background: linear-gradient(135deg, rgba(107, 33, 168, 0.32), rgba(59, 7, 100, 0.38));
  border-color: rgba(192, 132, 252, 0.5);
}
.brain-trigger:hover {
  box-shadow: 0 0 16px rgba(192, 132, 252, 0.35);
  border-color: #d8b4fe;
}

.muscle-trigger {
  background: linear-gradient(135deg, rgba(190, 18, 60, 0.32), rgba(136, 19, 55, 0.36));
  border-color: rgba(251, 113, 133, 0.5);
}
.muscle-trigger:hover {
  box-shadow: 0 0 16px rgba(251, 113, 133, 0.35);
  border-color: #fda4af;
}

.gland-trigger {
  background: linear-gradient(135deg, rgba(15, 118, 110, 0.35), rgba(17, 94, 89, 0.38));
  border-color: rgba(45, 212, 191, 0.5);
}
.gland-trigger:hover {
  box-shadow: 0 0 16px rgba(45, 212, 191, 0.35);
  border-color: #5eead4;
}

/* Effector Status Meters */
.effector-status-box {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.meter-card {
  padding: 8px 10px;
  border-radius: 10px;
  background: rgba(15, 23, 42, 0.72);
  border: 1px solid rgba(148, 163, 184, 0.2);
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.muscle-card {
  border-left: 3px solid var(--accent-muscle);
}

.gland-card {
  border-left: 3px solid var(--accent-gland);
}

.meter-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  font-weight: 700;
}

.meter-val {
  font-family: monospace;
  font-size: 12px;
  color: var(--accent-gold);
}

.meter-bar-bg {
  width: 100%;
  height: 7px;
  border-radius: 999px;
  background: rgba(30, 41, 59, 0.9);
  overflow: hidden;
}

.meter-bar-fill {
  height: 100%;
  border-radius: 999px;
  transition: width 0.08s linear;
}

.muscle-fill {
  background: linear-gradient(90deg, #f43f5e, #fb923c, #fbbf24);
  box-shadow: 0 0 10px rgba(244, 63, 94, 0.6);
}

.gland-fill {
  background: linear-gradient(90deg, #14b8a6, #2dd4bf, #38bdf8);
  box-shadow: 0 0 10px rgba(45, 212, 191, 0.6);
}

.meter-sub {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  font-size: 10.5px;
  color: var(--text-muted);
}

.mini-action-btn {
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 10.5px;
  font-weight: 600;
  border: 1px solid rgba(148, 163, 184, 0.35);
  background: rgba(30, 41, 59, 0.85);
  color: #e2e8f0;
  cursor: pointer;
  flex-shrink: 0;
  transition: all 0.15s ease;
}

.mini-action-btn:hover {
  border-color: var(--accent-cyan);
  color: #fff;
}

.mini-action-btn.active {
  background: rgba(245, 158, 11, 0.28);
  border-color: var(--accent-gold);
  color: var(--accent-gold);
}

/* Anatomical Node Directory */
.node-directory-section {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 120px;
}

.node-list {
  display: flex;
  flex-direction: column;
  gap: 5px;
  overflow-y: auto;
  padding-right: 2px;
}

.node-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 7px 9px;
  border-radius: 9px;
  background: rgba(15, 23, 42, 0.65);
  border: 1px solid rgba(148, 163, 184, 0.16);
  cursor: pointer;
  transition: all 0.16s ease;
}

.node-item:hover {
  background: rgba(30, 41, 59, 0.85);
  border-color: rgba(56, 189, 248, 0.4);
}

.node-item.active {
  background: rgba(14, 116, 144, 0.32);
  border-color: var(--accent-cyan);
  box-shadow: inset 0 0 12px rgba(56, 189, 248, 0.18);
}

.node-left {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.node-swatch {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 8px currentColor;
}

.node-titles {
  display: flex;
  flex-direction: column;
}

.node-zh {
  font-size: 12px;
  font-weight: 700;
  color: #f1f5f9;
}

.node-en {
  font-size: 10px;
  color: var(--text-muted);
}

.node-tag {
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 99px;
  background: rgba(51, 65, 85, 0.7);
  color: #cbd5e1;
  flex-shrink: 0;
}

/* Right Scientific Info & Oscilloscope Panel */
.info-panel {
  position: fixed;
  top: 88px;
  right: 16px;
  bottom: 84px;
  width: 300px;
  z-index: 10;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 14px;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  box-shadow: var(--shadow-glow);
  overflow-y: auto;
}

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

.info-badge {
  font-size: 11px;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 99px;
  background: rgba(56, 189, 248, 0.15);
  border: 1px solid rgba(56, 189, 248, 0.4);
  color: var(--accent-cyan);
}

.info-status-pill {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 99px;
  background: rgba(251, 191, 36, 0.15);
  border: 1px solid rgba(251, 191, 36, 0.4);
  color: var(--accent-gold);
}

.info-title {
  font-size: 18px;
  font-weight: 800;
  color: #ffffff;
  line-height: 1.25;
}

.info-en {
  font-size: 11.5px;
  color: var(--accent-cyan);
  margin-top: -6px;
  font-weight: 600;
}

.info-desc {
  font-size: 12.5px;
  line-height: 1.55;
  color: #dbeafe;
  background: rgba(15, 23, 42, 0.55);
  padding: 9px 11px;
  border-radius: 9px;
  border: 1px solid rgba(148, 163, 184, 0.14);
}

/* Substructure Box */
.substructure-box {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 9px 11px;
  border-radius: 10px;
  background: rgba(15, 23, 42, 0.72);
  border: 1px solid rgba(56, 189, 248, 0.22);
}

.substructure-header {
  font-size: 11.5px;
  font-weight: 700;
  color: #bae6fd;
}

.substructure-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.sub-chip {
  padding: 4px 9px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  background: rgba(30, 41, 59, 0.85);
  border: 1px solid rgba(148, 163, 184, 0.3);
  color: #e2e8f0;
  cursor: pointer;
  transition: all 0.15s ease;
}

.sub-chip:hover {
  border-color: var(--accent-cyan);
  color: #fff;
}

.sub-chip.active {
  background: rgba(56, 189, 248, 0.24);
  border-color: var(--accent-cyan);
  color: #ffffff;
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.3);
}

.substructure-detail {
  font-size: 11.5px;
  line-height: 1.48;
  color: var(--text-muted);
  padding-top: 4px;
  border-top: 1px dashed rgba(148, 163, 184, 0.2);
}

/* Live Oscilloscope */
.oscilloscope-box {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 9px 11px;
  border-radius: 10px;
  background: rgba(6, 11, 22, 0.9);
  border: 1px solid rgba(56, 189, 248, 0.25);
}

.osc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 4px;
}

.osc-title {
  font-size: 11.5px;
  font-weight: 700;
  color: #e2e8f0;
}

.osc-legend {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 10px;
  color: var(--text-muted);
}

.leg-item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.leg-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  display: inline-block;
}
.ap-dot { background: #38bdf8; }
.mus-dot { background: #fb7185; }
.gld-dot { background: #2dd4bf; }

#oscCanvas {
  width: 100%;
  height: 108px;
  border-radius: 7px;
  background: #040812;
  border: 1px solid rgba(30, 58, 138, 0.45);
}

.osc-readout {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-muted);
}

.osc-readout strong {
  color: var(--accent-gold);
  font-family: monospace;
}

/* Feature Card */
.feature-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 9px 11px;
  border-radius: 10px;
  background: rgba(15, 23, 42, 0.65);
  border: 1px solid rgba(148, 163, 184, 0.16);
}

.feature-row {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-bottom: 5px;
  border-bottom: 1px solid rgba(148, 163, 184, 0.1);
}

.feature-row:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.feature-label {
  font-size: 10.5px;
  font-weight: 700;
  color: var(--accent-cyan);
}

.feature-val {
  font-size: 11.5px;
  color: #f1f5f9;
  line-height: 1.4;
}

/* Bottom Controls Bar */
.bottom-bar {
  position: fixed;
  left: 16px;
  right: 16px;
  bottom: 12px;
  z-index: 12;
  padding: 9px 16px;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  box-shadow: var(--shadow-glow);
}

.controls-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.group-label {
  font-size: 10.5px;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

.btn-segmented {
  display: inline-flex;
  background: rgba(15, 23, 42, 0.85);
  padding: 3px;
  border-radius: 9px;
  border: 1px solid rgba(148, 163, 184, 0.22);
  gap: 4px;
}

.seg-btn {
  padding: 5px 10px;
  border-radius: 7px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 11.5px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.seg-btn:hover {
  color: #ffffff;
}

.seg-btn.active {
  background: linear-gradient(135deg, #0284c7, #2563eb);
  color: #ffffff;
  box-shadow: 0 2px 10px rgba(37, 99, 235, 0.4);
}

.slider-group {
  min-width: 195px;
}

.slider-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.slider-val {
  font-size: 11px;
  font-weight: 700;
  color: var(--accent-gold);
}

.cut-slider {
  width: 100%;
  accent-color: var(--accent-cyan);
  cursor: pointer;
}

.toggles-group {
  flex-direction: row;
  align-items: center;
  gap: 8px;
}

.toggle-btn {
  padding: 7px 11px;
  border-radius: 9px;
  border: 1px solid rgba(148, 163, 184, 0.25);
  background: rgba(15, 23, 42, 0.8);
  color: var(--text-main);
  font-size: 11.5px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.toggle-btn:hover {
  border-color: var(--accent-cyan);
}

.toggle-btn.active {
  background: rgba(56, 189, 248, 0.2);
  border-color: var(--accent-cyan);
  color: #fff;
}

/* ========================================================================
   Collapsible side panels (maximize the 3D viewport)
   ======================================================================== */
.control-sidebar,
.info-panel {
  transition: transform 0.32s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.25s ease;
}

.control-sidebar.collapsed {
  transform: translateX(calc(-100% - 24px));
  opacity: 0;
  pointer-events: none;
}

.info-panel.collapsed {
  transform: translateX(calc(100% + 24px));
  opacity: 0;
  pointer-events: none;
}

.panel-toggle {
  position: fixed;
  top: 50%;
  z-index: 11;
  transform: translateY(-50%);
  writing-mode: vertical-rl;
  padding: 12px 5px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: #e0f2fe;
  background: rgba(11, 17, 30, 0.92);
  border: 1px solid rgba(56, 189, 248, 0.45);
  cursor: pointer;
  box-shadow: var(--shadow-glow);
  transition: left 0.32s cubic-bezier(0.4, 0, 0.2, 1), right 0.32s cubic-bezier(0.4, 0, 0.2, 1), background 0.15s ease;
}

.panel-toggle:hover {
  background: rgba(14, 116, 144, 0.55);
  color: #fff;
}

.panel-toggle.left {
  left: 290px;
  border-radius: 0 9px 9px 0;
}

.panel-toggle.right {
  right: 320px;
  border-radius: 9px 0 0 9px;
}

.panel-toggle.left.is-collapsed { left: 0; }
.panel-toggle.right.is-collapsed { right: 0; }

/* Compact header so the viewport gets more vertical room */
.hud-header {
  padding: 7px 14px;
}
.brand-title {
  font-size: 15px;
}
.brand-subtitle {
  font-size: 11px;
}

@media (max-width: 1280px) {
  .brand-subtitle { display: none; }
  .mode-en { display: none; }
}

@media (max-width: 1100px) {
  .control-sidebar { width: 245px; }
  .info-panel { width: 270px; }
  .panel-toggle.left { left: 265px; }
  .panel-toggle.right { right: 290px; }
}