:root {
  --bg: #0a0a1a;
  --bg2: #111133;
  --cyan: #00f0ff;
  --purple: #a855f7;
  --pink: #f0abfc;
  --green: #22c55e;
  --red: #ef4444;
  --text: #e0e0f0;
  --text-dim: #7878a0;
  --glass-bg: rgba(16, 16, 48, 0.65);
  --glass-border: rgba(100, 100, 200, 0.15);
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Space Grotesk', sans-serif;
  overflow-x: hidden;
  min-height: 100vh;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: 
    linear-gradient(rgba(100,100,200,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(100,100,200,0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

#app { position: relative; z-index: 1; display: flex; flex-direction: column; min-height: 100vh; }

#header {
  text-align: center;
  padding: 18px 16px 10px;
  border-bottom: 1px solid var(--glass-border);
}

#title {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 800;
  font-size: 2rem;
  background: linear-gradient(135deg, var(--purple), var(--cyan), var(--pink), var(--purple));
  background-size: 300% 300%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: gradientShift 4s ease infinite;
}

.brain-emoji {
  -webkit-text-fill-color: initial;
  font-size: 1.6rem;
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

#subtitle {
  font-size: 0.8rem;
  color: var(--text-dim);
  font-style: italic;
  margin-top: 4px;
}

#main-container {
  display: flex;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.panel-glass {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 14px;
}

.panel-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--cyan);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.icon { font-size: 1rem; }

/* LEFT PANEL */
#left-panel {
  width: 240px;
  min-width: 240px;
  padding: 12px;
  overflow-y: auto;
}

#dataset-list { display: flex; flex-direction: column; gap: 8px; margin-bottom: 12px; }

.dataset-item {
  background: rgba(20,20,60,0.6);
  border: 2px solid transparent;
  border-radius: 8px;
  padding: 8px;
  cursor: pointer;
  transition: all 0.2s;
}

.dataset-item:hover { border-color: rgba(0,240,255,0.3); }
.dataset-item.selected { border-color: var(--cyan); box-shadow: 0 0 12px rgba(0,240,255,0.2); }

.dataset-name {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 700;
  margin-bottom: 6px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.frame-badge {
  background: var(--purple);
  color: white;
  font-size: 0.6rem;
  padding: 1px 6px;
  border-radius: 8px;
}

.dataset-thumbs {
  display: flex;
  gap: 2px;
  overflow-x: auto;
}

.dataset-thumbs canvas {
  width: 24px;
  height: 24px;
  border-radius: 2px;
  flex-shrink: 0;
}

#upload-zone {
  border: 2px dashed rgba(100,100,200,0.3);
  border-radius: 8px;
  padding: 16px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
}

#upload-zone:hover { border-color: var(--cyan); background: rgba(0,240,255,0.05); }

.upload-icon { font-size: 1.4rem; display: block; margin-bottom: 4px; }

#upload-label { font-size: 0.7rem; color: var(--text-dim); }

/* CENTER PANEL */
#center-panel {
  flex: 1;
  position: relative;
  min-width: 0;
}

#nn-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

#loss-overlay {
  position: absolute;
  bottom: 12px;
  right: 12px;
  background: rgba(10,10,26,0.85);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  padding: 8px;
}

#loss-canvas { display: block; }

.loss-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6rem;
  color: var(--text-dim);
  display: block;
  text-align: center;
  margin-top: 4px;
}

#tooltip {
  position: absolute;
  background: rgba(10,10,26,0.95);
  border: 1px solid var(--cyan);
  border-radius: 6px;
  padding: 6px 10px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  pointer-events: none;
  z-index: 100;
}

#tooltip.hidden { display: none; }

/* RIGHT PANEL */
#right-panel {
  width: 270px;
  min-width: 270px;
  padding: 12px;
  overflow-y: auto;
}

.control-group {
  margin-bottom: 10px;
}

.control-group label {
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  color: var(--text-dim);
  margin-bottom: 4px;
  font-family: 'JetBrains Mono', monospace;
}

.res-info {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6rem;
  color: var(--pink);
  background: rgba(240,171,252,0.08);
  border: 1px solid rgba(240,171,252,0.15);
  border-radius: 6px;
  padding: 4px 8px;
  margin-bottom: 10px;
  text-align: center;
}

.val {
  color: var(--cyan);
  font-weight: 700;
}

input[type="range"] {
  width: 100%;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: rgba(100,100,200,0.2);
  border-radius: 2px;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--cyan);
  cursor: pointer;
  box-shadow: 0 0 8px rgba(0,240,255,0.5);
}

select {
  width: 100%;
  background: rgba(20,20,60,0.8);
  color: var(--text);
  border: 1px solid var(--glass-border);
  border-radius: 6px;
  padding: 6px 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  outline: none;
}

select:focus { border-color: var(--cyan); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 100%;
  padding: 10px 14px;
  border: none;
  border-radius: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: 6px;
}

.btn:disabled { opacity: 0.35; cursor: not-allowed; }

.btn-green {
  background: linear-gradient(135deg, #166534, #22c55e);
  color: white;
  box-shadow: 0 0 16px rgba(34,197,94,0.3);
}
.btn-green:hover:not(:disabled) { box-shadow: 0 0 24px rgba(34,197,94,0.5); }

.btn-red { background: linear-gradient(135deg, #991b1b, #ef4444); color: white; }

.btn-purple {
  background: linear-gradient(135deg, #6b21a8, #a855f7);
  color: white;
  box-shadow: 0 0 16px rgba(168,85,247,0.3);
}
.btn-purple:hover:not(:disabled) { box-shadow: 0 0 24px rgba(168,85,247,0.5); }

.btn-pink {
  background: linear-gradient(135deg, #a21caf, #f0abfc);
  color: #1a1a2e;
  box-shadow: 0 0 12px rgba(240,171,252,0.2);
}

.btn-cyan {
  background: linear-gradient(135deg, #0e7490, #00f0ff);
  color: #0a0a1a;
}

.btn-dim {
  background: rgba(40,40,80,0.6);
  color: var(--text-dim);
  border: 1px solid var(--glass-border);
}
.btn-dim:hover { background: rgba(60,60,100,0.6); }

#train-buttons { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 8px; }
#train-buttons .btn { flex: 1; min-width: 60px; }

#progress-container { margin-bottom: 10px; }
#progress-bar {
  height: 6px;
  background: rgba(100,100,200,0.15);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 4px;
}
#progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--cyan), var(--purple));
  border-radius: 3px;
  transition: width 0.15s;
}
#progress-text {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  color: var(--text-dim);
  text-align: center;
}

#stats { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; margin-bottom: 10px; }
.stat {
  background: rgba(20,20,60,0.5);
  border-radius: 6px;
  padding: 6px 8px;
  display: flex;
  flex-direction: column;
}
.stat-label {
  font-size: 0.55rem;
  color: var(--text-dim);
  font-family: 'JetBrains Mono', monospace;
  text-transform: uppercase;
}
.stat-val {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--cyan);
}

.mini-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: var(--pink);
  margin: 8px 0 6px;
}

#generated-strip {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  padding-bottom: 6px;
  margin-bottom: 6px;
}

#generated-strip canvas {
  width: 36px;
  height: 36px;
  border-radius: 4px;
  flex-shrink: 0;
  border: 1px solid var(--glass-border);
  animation: fadeInFrame 0.3s ease;
}

@keyframes fadeInFrame {
  from { opacity: 0; transform: scale(0.8); }
  to { opacity: 1; transform: scale(1); }
}

/* TIMELINE */
#timeline-bar { padding: 8px 12px; }

.timeline-glass {
  display: flex;
  align-items: center;
  gap: 10px;
}

.timeline-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  color: var(--text-dim);
  white-space: nowrap;
}

#timeline-strip {
  display: flex;
  gap: 3px;
  overflow-x: auto;
  flex: 1;
  padding: 4px 0;
}

#timeline-strip canvas {
  width: 32px;
  height: 32px;
  border-radius: 3px;
  flex-shrink: 0;
  border: 2px solid transparent;
  transition: border-color 0.2s;
}

#timeline-strip canvas.seen { border-color: rgba(34,197,94,0.4); }
#timeline-strip canvas.current { border-color: var(--cyan); box-shadow: 0 0 8px rgba(0,240,255,0.4); }

/* FOOTER */
#footer {
  text-align: center;
  padding: 12px;
  font-size: 0.7rem;
  color: var(--text-dim);
  border-top: 1px solid var(--glass-border);
  display: flex;
  justify-content: center;
  gap: 16px;
  font-family: 'JetBrains Mono', monospace;
}

#footer a { color: var(--cyan); text-decoration: none; }
#footer a:hover { text-decoration: underline; }

/* MODAL */
#video-player-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

#video-player-modal.hidden { display: none; }

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.7);
}

.modal-content {
  position: relative;
  background: var(--bg2);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 24px;
  text-align: center;
}

#playback-canvas {
  border-radius: 8px;
  border: 2px solid var(--cyan);
  image-rendering: pixelated;
  width: 256px;
  height: 256px;
}

#playback-info {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-dim);
  margin: 10px 0;
}

.hidden { display: none !important; }

/* Scrollbar */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(100,100,200,0.3); border-radius: 3px; }

/* MOBILE */
@media (max-width: 900px) {
  #main-container { flex-direction: column; }
  #left-panel, #right-panel { width: 100%; min-width: 0; }
  #center-panel { min-height: 350px; }
  #title { font-size: 1.3rem; }
}