:root {
  --bg-primary: #0f141c;
  --bg-secondary: #18202c;
  --bg-tertiary: #222d3d;
  --text-primary: #f0f4f8;
  --text-secondary: #94a3b8;
  --border-color: #2e3d52;
  --accent-color: #38bdf8;
  --accent-hover: #0284c7;
  --danger-color: #ef4444;
  --success-color: #10b981;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

html, body {
  width: 100%; height: 100%; overflow: hidden;
  background-color: var(--bg-primary); color: var(--text-primary);
  font-family: var(--font-family); font-size: 14px;
}

#app-container {
  display: flex; flex-direction: column; width: 100%; height: 100%; position: relative;
}

/* --- Top Header (Mechanism SVG & Title) --- */
#top-header {
  height: auto;
  min-height: auto;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  padding: 8px 16px;
  position: relative;
  z-index: 10;
  flex-shrink: 0;
  transition: all 0.2s ease;
}

.header-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0;
}

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

.bundle-select {
  background: var(--bg-tertiary); color: var(--text-primary);
  border: 1px solid var(--border-color); border-radius: 4px;
  padding: 2px 8px; font-size: 12px; font-weight: 600; cursor: pointer; outline: none;
}
.bundle-select:hover { border-color: var(--accent-color); }

.reaction-title {
  font-weight: 600; font-size: 14px; color: var(--text-primary);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

.reaction-stats { font-size: 12px; color: var(--text-secondary); display: flex; gap: 12px; }
.reaction-stats span strong { color: var(--accent-color); }

#mechanism-strip {
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  background: transparent;
  border: none;
  box-shadow: none;
  z-index: 15;
  pointer-events: none;
  max-width: 96%;
  width: auto;
  padding: 0;
  margin: 0;
}
#mechanism-strip:empty {
  display: none !important;
}
#mechanism-strip svg {
  height: auto;
  max-height: min(220px, 36vh);
  max-width: 96vw;
  width: auto;
  filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.85));
  pointer-events: auto;
}

/* Interactive SVG mechanism elements */
.svg-clickable-arrow, .svg-clickable-state, .svg-clickable-molecule {
  cursor: pointer !important;
  transition: opacity 0.15s ease, filter 0.15s ease;
  pointer-events: auto !important;
}
.svg-hit-cushion {
  pointer-events: all !important;
  cursor: pointer !important;
}

/* Arrow Hover: Electric Cyan Pill & Glow */
.svg-clickable-arrow:hover {
  filter: drop-shadow(0 0 10px #38bdf8) !important;
}
.svg-clickable-arrow:hover rect.svg-hit-cushion {
  fill: rgba(56, 189, 248, 0.22) !important;
  stroke: #38bdf8 !important;
  stroke-width: 0.8 !important;
  transition: fill 0.15s ease, stroke 0.15s ease;
}
.svg-clickable-arrow:hover path:not(.svg-hit-cushion) {
  stroke: #38bdf8 !important;
  stroke-width: 1.4 !important;
  transition: stroke 0.15s ease, stroke-width 0.15s ease;
}

/* Molecule Hover: Purple Pill & Glow */
.svg-clickable-molecule:hover {
  filter: drop-shadow(0 0 10px #c084fc) !important;
}
.svg-clickable-molecule:hover rect.svg-hit-cushion {
  fill: rgba(168, 85, 247, 0.22) !important;
  stroke: rgba(192, 132, 252, 0.85) !important;
  stroke-width: 0.8 !important;
  transition: fill 0.15s ease, stroke 0.15s ease;
}

/* State Intermediate Hover: Emerald Pill & Glow */
.svg-clickable-state:hover {
  filter: drop-shadow(0 0 10px #34d399) !important;
}
.svg-clickable-state:hover rect.svg-hit-cushion {
  fill: rgba(16, 185, 129, 0.22) !important;
  stroke: rgba(52, 211, 153, 0.85) !important;
  stroke-width: 0.8 !important;
  transition: fill 0.15s ease, stroke 0.15s ease;
}

/* Persistent active element highlight removed per user request: only hover states show visual highlight */
.svg-active-element {
  filter: none !important;
}
.svg-active-element rect.svg-hit-cushion {
  fill: transparent !important;
  stroke: none !important;
}

/* Crisp solid text typography (fixes Inkscape hollow/dark letter paths) */
#mechanism-strip svg g[aria-label] path,
#mechanism-strip svg g[id^="text"] path,
#mechanism-strip svg text,
#mechanism-strip svg tspan,
#mechanism-strip svg text tspan,
#mechanism-strip svg text * {
  fill: #f1f5f9 !important;
  stroke: none !important;
}

/* Directional Push Arrow State & Visibility (SVG colors strictly preserved) */
.svg-push-active {
  opacity: 1.0 !important;
  visibility: visible !important;
}
.svg-push-inactive {
  opacity: 0.15 !important;
  transition: opacity 0.2s ease-in-out;
}

/* --- Main Viewport (3D + PES Background) --- */
#viewport-container {
  flex: 1; position: relative; overflow: hidden;
  background: radial-gradient(circle at center, #161e2b 0%, #0c1017 100%);
}

#gl-canvas-container { width: 100%; height: 100%; position: absolute; top: 0; left: 0; z-index: 2; pointer-events: auto; }
#pes-canvas-container {
  position: absolute; bottom: 0; left: 0; width: 100%; height: 90%;
  z-index: 1; pointer-events: none; opacity: 0.9;
}
#pes-canvas { width: 100%; height: 100%; display: block; }

/* Top-Right Drawer Toggle */
.viewport-overlay-controls { position: absolute; top: 12px; right: 12px; z-index: 25; }
.btn-panel-toggle {
  background: rgba(24, 32, 44, 0.95); border: 1px solid var(--border-color);
  color: var(--text-primary); border-radius: 4px; padding: 4px 10px;
  font-size: 12px; font-weight: 600; cursor: pointer;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
}
.btn-panel-toggle:hover { border-color: var(--accent-color); }

/* Side Panel (Molecular Explorer Grouped Orbitals Checklist) */
#side-panel, .side-panel {
  position: absolute; top: 44px; right: 12px; width: 260px; max-height: calc(100% - 190px);
  background-color: var(--bg-secondary); border: 1px solid var(--border-color);
  border-radius: 6px; z-index: 24; display: flex; flex-direction: column;
  transition: transform 0.2s ease, opacity 0.2s ease;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5); overflow: hidden;
}
#side-panel.panel-hidden, .side-panel.panel-hidden { transform: translateX(290px); opacity: 0; pointer-events: none; }

.panel-header {
  padding: 8px 12px; font-weight: 600; font-size: 12px;
  border-bottom: 1px solid var(--border-color);
  display: flex; justify-content: space-between; align-items: center;
  background-color: var(--bg-tertiary); color: var(--text-primary);
}

.panel-body {
  padding: 8px 10px; overflow-y: auto; display: flex; flex-direction: column; gap: 8px; flex: 1;
}
.orbitals-list-container {
  display: flex; flex-direction: column; gap: 6px; overflow-y: auto; max-height: 380px;
}

/* Molecular Explorer Grouped Orbitals CSS */
.orbital-group {
  margin-bottom: 4px; border-bottom: 1px solid rgba(255, 255, 255, 0.06); padding-bottom: 4px;
}
.orbital-group:last-child { border-bottom: none; }
.orbital-group-header {
  display: flex; justify-content: space-between; align-items: center; cursor: pointer;
  padding: 3px 2px; user-select: none;
}
.group-title { font-size: 11px; font-weight: 700; color: #94a3b8; letter-spacing: 0.4px; }
.orbital-group-header:hover .group-title { color: #f8fafc; }
.group-chevron { font-size: 10px; color: #64748b; }
.orbital-group-body { display: flex; flex-direction: column; gap: 2px; padding: 2px 0 2px 2px; }
.orbital-item-row {
  display: flex; align-items: center; gap: 6px; padding: 2px 4px;
  border-radius: 3px; cursor: pointer; font-size: 12px; color: var(--text-primary); user-select: none;
}
.orbital-item-row:hover { background: rgba(255, 255, 255, 0.05); }
.orb-chk { width: 13px; height: 13px; cursor: pointer; accent-color: var(--accent-color); flex-shrink: 0; }
.orb-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.orb-label-text {
  font-size: 12px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-family: monospace;
}
.esp-group {
  margin-top: 4px; border-top: 1px dashed rgba(255, 255, 255, 0.1); padding-top: 4px;
}

/* Bottom Playback Dock */
#bottom-dock {
  container-type: inline-size;
  container-name: dock;
  height: 64px; background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 16px; gap: 16px; z-index: 10; flex-shrink: 0;
  box-sizing: border-box;
}
.playback-buttons { display: flex; align-items: center; gap: 6px; flex-shrink: 0; }
.btn {
  background-color: var(--bg-tertiary); color: var(--text-primary);
  border: 1px solid var(--border-color); border-radius: 4px;
  padding: 6px 12px; font-size: 13px; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 500; transition: background-color 0.15s, border-color 0.15s;
  white-space: nowrap;
}
.btn:hover { background-color: #2b394e; border-color: var(--accent-color); }
.btn-sm { padding: 3px 8px; font-size: 12px; }
.btn-primary {
  background-color: var(--accent-color); color: #041019;
  border-color: var(--accent-color); font-weight: 600;
}
.btn-primary:hover { background-color: var(--accent-hover); border-color: var(--accent-hover); }

/* Forward & Reverse Play Buttons */
.btn-play-fwd {
  background-color: #3b82f6; color: #ffffff;
  border: 1px solid #3b82f6; border-radius: 9999px;
  padding: 6px 14px; font-weight: 600;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  white-space: nowrap;
}
.btn-play-fwd:hover { background-color: #2563eb; border-color: #2563eb; }
.btn-play-fwd.active {
  background-color: #1d4ed8; border-color: #60a5fa;
  box-shadow: 0 0 10px rgba(59, 130, 246, 0.6);
}

.btn-play-rev {
  background-color: #e2e8f0; color: #0f172a;
  border: 1px solid #cbd5e1; border-radius: 9999px;
  padding: 6px 14px; font-weight: 600;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  white-space: nowrap;
}
.btn-play-rev:hover { background-color: #cbd5e1; border-color: #94a3b8; }
.btn-play-rev.active {
  background-color: #94a3b8; border-color: #64748b;
  box-shadow: 0 0 10px rgba(226, 232, 240, 0.6);
}

.slider-container { flex: 1; min-width: 60px; display: flex; align-items: center; gap: 12px; }
#frame-slider { flex: 1; min-width: 50px; accent-color: var(--accent-color); cursor: pointer; height: 6px; }
.frame-info {
  font-variant-numeric: tabular-nums; font-size: 13px; color: var(--text-secondary); white-space: nowrap;
  flex-shrink: 0;
}
.frame-info strong { color: var(--text-primary); }
.dock-actions { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }

/* ========================================================
   Responsive & Adaptive Dock Styling (Container & Media Queries)
   ======================================================== */

/* Level 1: Medium / Embedded (< 720px) */
@container dock (max-width: 720px) {
  #bottom-dock { padding: 0 10px; gap: 10px; }
  #btn-first, #btn-last { display: none !important; }
  .btn-play-fwd .btn-text, .btn-play-rev .btn-text { display: none !important; }
  .btn-play-fwd, .btn-play-rev {
    padding: 6px 10px;
    min-width: 34px;
    height: 32px;
  }
  .frame-energy { display: none !important; }
  .slider-container { gap: 8px; }
}

@media (max-width: 720px) {
  #bottom-dock { padding: 0 10px; gap: 10px; }
  #btn-first, #btn-last { display: none !important; }
  .btn-play-fwd .btn-text, .btn-play-rev .btn-text { display: none !important; }
  .btn-play-fwd, .btn-play-rev {
    padding: 6px 10px;
    min-width: 34px;
    height: 32px;
  }
  .frame-energy { display: none !important; }
  .slider-container { gap: 8px; }
}

/* Level 2: Compact / Narrow (< 500px) */
@container dock (max-width: 500px) {
  #bottom-dock { padding: 0 8px; gap: 8px; }
  #btn-prev, #btn-next { display: none !important; }
  .dock-actions { display: none !important; }
  .frame-prefix { display: none !important; }
  .slider-container { gap: 6px; }
}

@media (max-width: 500px) {
  #bottom-dock { padding: 0 8px; gap: 8px; }
  #btn-prev, #btn-next { display: none !important; }
  .dock-actions { display: none !important; }
  .frame-prefix { display: none !important; }
  .slider-container { gap: 6px; }
}

/* Explicit class overrides (?controls=compact or ?controls=minimal) */
#bottom-dock.dock-force-compact #btn-first,
#bottom-dock.dock-force-compact #btn-last,
#bottom-dock.dock-force-compact .btn-text,
#bottom-dock.dock-force-compact .frame-energy {
  display: none !important;
}
#bottom-dock.dock-force-compact .btn-play-fwd,
#bottom-dock.dock-force-compact .btn-play-rev {
  padding: 6px 10px;
  min-width: 34px;
  height: 32px;
}

#bottom-dock.dock-force-minimal #btn-first,
#bottom-dock.dock-force-minimal #btn-last,
#bottom-dock.dock-force-minimal #btn-prev,
#bottom-dock.dock-force-minimal #btn-next,
#bottom-dock.dock-force-minimal .btn-text,
#bottom-dock.dock-force-minimal .frame-energy,
#bottom-dock.dock-force-minimal .frame-prefix,
#bottom-dock.dock-force-minimal .dock-actions {
  display: none !important;
}
#bottom-dock.dock-force-minimal .btn-play-fwd,
#bottom-dock.dock-force-minimal .btn-play-rev {
  padding: 6px 10px;
  min-width: 34px;
  height: 32px;
}

/* In-Page Molecule Modal Dialog */
.custom-modal-backdrop {
  position: fixed; top: 0; left: 0; width: 100vw; height: 100vh;
  background: rgba(0, 0, 0, 0.65); z-index: 9999;
  overflow: hidden; pointer-events: auto;
}
.custom-modal-dialog {
  position: absolute;
  background: #0f172a; border: 1px solid var(--border-color); border-radius: 8px;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.85); width: 920px; max-width: 98vw;
  height: 560px; max-height: 96vh; min-width: 420px; min-height: 320px;
  display: flex; flex-direction: column; overflow: hidden;
  resize: both;
}
.modal-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 16px; background: rgba(0, 0, 0, 0.35); border-bottom: 1px solid var(--border-color);
  cursor: grab; user-select: none;
}
.modal-header:active { cursor: grabbing; }
.modal-title-group { display: flex; align-items: center; gap: 8px; pointer-events: none; }
.modal-title-group h3 { font-size: 14px; font-weight: 700; color: #f8fafc; }
.chip-blue {
  font-size: 11px; padding: 2px 6px; background: rgba(56, 189, 248, 0.15);
  color: #38bdf8; border: 1px solid rgba(56, 189, 248, 0.3); border-radius: 4px;
}
.modal-actions { display: flex; align-items: center; gap: 8px; cursor: default; }
.btn-modal-close {
  background: transparent; border: none; color: #94a3b8; font-size: 20px; cursor: pointer;
}
.btn-modal-close:hover { color: #fff; }
.modal-viewport-container {
  flex: 1; position: relative; overflow: hidden;
  background: radial-gradient(circle at center, #161e2b 0%, #0c1017 100%);
}
.modal-gl-canvas { width: 100%; height: 100%; position: absolute; top: 0; left: 0; }
.custom-modal-dialog .side-panel { max-height: calc(100% - 60px); }
.modal-resize-handle {
  position: absolute; right: 2px; bottom: 2px; width: 14px; height: 14px;
  cursor: se-resize; z-index: 50; user-select: none;
  background: linear-gradient(135deg, transparent 40%, rgba(255,255,255,0.4) 40%, rgba(255,255,255,0.4) 55%, transparent 55%, transparent 70%, rgba(255,255,255,0.4) 70%);
}

/* Dropzone / Progress Overlay */
#overlay {
  position: absolute; top: 0; left: 0; width: 100%; height: 100%;
  background-color: rgba(15, 20, 28, 0.95); display: flex; flex-direction: column;
  align-items: center; justify-content: center; z-index: 100; padding: 24px;
}
.overlay-box {
  background-color: var(--bg-secondary); border: 2px dashed var(--border-color);
  border-radius: 8px; padding: 36px 48px; text-align: center; max-width: 500px; width: 100%;
}
.overlay-box.dragover { border-color: var(--accent-color); background-color: #1a2535; }
.overlay-title { font-size: 18px; font-weight: 600; margin-bottom: 12px; }
.overlay-desc { color: var(--text-secondary); margin-bottom: 20px; font-size: 13px; }
.progress-bar-container {
  width: 100%; height: 8px; background-color: var(--bg-tertiary);
  border-radius: 4px; overflow: hidden; margin-top: 16px; display: none;
}
.progress-bar {
  height: 100%; width: 0%; background-color: var(--accent-color); transition: width 0.2s;
}

/* ESP Colorbar */
.esp-colorbar {
  position: absolute; top: 12px; left: 50%; transform: translateX(-50%);
  width: 280px; max-width: 80%;
  background: rgba(15, 20, 28, 0.85);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.15); border-radius: 8px;
  padding: 6px 14px; display: flex; flex-direction: column; gap: 4px;
  z-index: 10; pointer-events: none;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}
.colorbar-header {
  font-size: 10px; font-weight: 600; color: #94a3b8; text-align: center;
  letter-spacing: 0.5px; text-transform: uppercase;
}
.colorbar-gradient {
  height: 10px; width: 100%; border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: linear-gradient(90deg, #ff3333 0%, #ffffff 50%, #3333ff 100%);
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.3);
}
.colorbar-labels {
  display: flex; justify-content: space-between;
  font-size: 10px; font-weight: 700; color: #e2e8f0; font-variant-numeric: tabular-nums;
}

/* Download Modal */
.modal-backdrop {
  position: fixed; top: 0; left: 0; width: 100vw; height: 100vh;
  background: rgba(0, 0, 0, 0.7); backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px);
  z-index: 10000; display: flex; align-items: center; justify-content: center;
}
.download-modal-dialog {
  background: var(--bg-secondary); border: 1px solid var(--border-color);
  border-radius: 10px; width: 440px; max-width: 90vw; max-height: 85vh;
  display: flex; flex-direction: column; box-shadow: 0 16px 48px rgba(0,0,0,0.6);
  color: var(--text-primary); overflow: hidden;
}
.download-modal-header {
  padding: 12px 16px; border-bottom: 1px solid var(--border-color);
  display: flex; justify-content: space-between; align-items: center;
  background: var(--bg-tertiary);
}
.download-modal-header h3 { margin: 0; font-size: 14px; font-weight: 600; }
.download-modal-body {
  padding: 16px; overflow-y: auto; display: flex; flex-direction: column; gap: 12px;
  font-size: 12px; max-height: 55vh;
}
.download-modal-footer {
  padding: 10px 16px; border-top: 1px solid var(--border-color);
  display: flex; justify-content: flex-end; gap: 8px; background: var(--bg-tertiary);
}
.download-option-card {
  padding: 10px 12px; border: 1px solid var(--border-color); border-radius: 6px;
  background: rgba(255,255,255,0.02); display: flex; align-items: flex-start; gap: 10px;
  cursor: pointer; transition: all 0.15s ease;
}
.download-option-card:hover {
  border-color: var(--accent-color); background: rgba(56, 189, 248, 0.05);
}
.download-option-card input[type="radio"] { margin-top: 3px; accent-color: var(--accent-color); }
.download-option-title { font-weight: 600; color: #fff; margin-bottom: 2px; }
.download-option-desc { font-size: 11px; color: var(--text-secondary); }
.download-checklist {
  display: flex; flex-direction: column; gap: 4px; max-height: 220px;
  overflow-y: auto; padding: 6px; background: rgba(0,0,0,0.25);
  border-radius: 6px; border: 1px solid var(--border-color);
}
.download-check-item {
  display: flex; align-items: center; gap: 8px; padding: 3px 6px;
  border-radius: 4px; cursor: pointer;
}
.download-check-item:hover { background: rgba(255,255,255,0.05); }
.download-check-item input[type="checkbox"] { accent-color: var(--accent-color); }