:root {
  --bg-deep: #0a0a14;
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: rgba(26, 26, 46, 0.7);
  --cyan: #00d4ff;
  --purple: #7b2ff7;
  --pink: #ff2d78;
  --green: #00ff88;
  --yellow: #ffd700;
  --text: #e0e0f0;
  --text-dim: #8888aa;
  --glass: rgba(255, 255, 255, 0.04);
  --glass-border: rgba(255, 255, 255, 0.08);
}

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

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

.font-mono { font-family: 'JetBrains Mono', monospace; }
.font-display { font-family: 'Space Grotesk', sans-serif; }

/* Neural background */
.neural-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  background: 
    radial-gradient(ellipse at 20% 50%, rgba(123, 47, 247, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(0, 212, 255, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(255, 45, 120, 0.05) 0%, transparent 50%),
    var(--bg-deep);
}

.neural-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  background-image: 
    linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  animation: gridPulse 8s ease-in-out infinite;
}

@keyframes gridPulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

/* Glass card */
.glass-card {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: 16px;
}

.glass-card-strong {
  background: rgba(26, 26, 46, 0.85);
  border: 1px solid rgba(123, 47, 247, 0.15);
  backdrop-filter: blur(30px);
  border-radius: 16px;
}

/* Glow button */
.btn-glow {
  position: relative;
  background: linear-gradient(135deg, var(--cyan), var(--purple));
  border: none;
  color: white;
  padding: 12px 28px;
  border-radius: 12px;
  font-weight: 600;
  font-family: 'Space Grotesk', sans-serif;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 15px;
}

.btn-glow:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 212, 255, 0.3);
}

.btn-glow:active {
  transform: translateY(0);
}

.btn-glow:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-glow.pulsing {
  animation: btnPulse 2s ease-in-out infinite;
}

@keyframes btnPulse {
  0%, 100% { box-shadow: 0 0 20px rgba(0, 212, 255, 0.2); }
  50% { box-shadow: 0 0 40px rgba(123, 47, 247, 0.4); }
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--glass-border);
  color: var(--text);
  padding: 10px 20px;
  border-radius: 10px;
  font-weight: 500;
  font-family: 'Space Grotesk', sans-serif;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 14px;
}

.btn-outline:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(0, 212, 255, 0.05);
}

.btn-danger {
  background: linear-gradient(135deg, #ff2d78, #ff6b6b);
  border: none;
  color: white;
  padding: 10px 20px;
  border-radius: 10px;
  font-weight: 600;
  font-family: 'Space Grotesk', sans-serif;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 14px;
}

.btn-danger:hover {
  box-shadow: 0 4px 20px rgba(255, 45, 120, 0.3);
}

/* Drop zone */
.drop-zone {
  border: 2px dashed rgba(123, 47, 247, 0.3);
  border-radius: 16px;
  transition: all 0.3s ease;
  cursor: pointer;
}

.drop-zone:hover, .drop-zone.active {
  border-color: var(--cyan);
  background: rgba(0, 212, 255, 0.03);
  box-shadow: inset 0 0 40px rgba(0, 212, 255, 0.05);
}

/* Progress bar */
.progress-track {
  background: rgba(255, 255, 255, 0.05);
  border-radius: 100px;
  overflow: hidden;
  height: 8px;
}

.progress-fill {
  height: 100%;
  border-radius: 100px;
  background: linear-gradient(90deg, var(--cyan), var(--purple));
  transition: width 0.3s ease;
}

/* Stepper */
.step-dot {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
  transition: all 0.4s ease;
  border: 2px solid var(--glass-border);
  background: var(--bg-secondary);
  color: var(--text-dim);
}

.step-dot.active {
  border-color: var(--cyan);
  background: linear-gradient(135deg, var(--cyan), var(--purple));
  color: white;
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
}

.step-dot.completed {
  border-color: var(--green);
  background: rgba(0, 255, 136, 0.15);
  color: var(--green);
}

.step-line {
  flex: 1;
  height: 2px;
  background: var(--glass-border);
  transition: background 0.4s ease;
}

.step-line.completed {
  background: linear-gradient(90deg, var(--green), var(--cyan));
}

/* Frame grid */
.frame-thumb {
  width: 64px;
  height: 64px;
  border-radius: 6px;
  object-fit: cover;
  border: 1px solid var(--glass-border);
  image-rendering: pixelated;
  transition: all 0.2s ease;
}

.frame-thumb:hover {
  border-color: var(--cyan);
  transform: scale(1.1);
  z-index: 10;
}

.frame-thumb.selected {
  border-color: var(--pink);
  box-shadow: 0 0 12px rgba(255, 45, 120, 0.4);
}

/* Output canvas */
.output-canvas {
  image-rendering: pixelated;
  border: 2px solid var(--glass-border);
  border-radius: 12px;
  background: #000;
}

/* Loss chart */
.loss-chart-container {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 16px;
}

/* Slider */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 100px;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--cyan), var(--purple));
  cursor: pointer;
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.3);
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--cyan), var(--purple));
  cursor: pointer;
  border: none;
}

/* Select */
select {
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 8px;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 14px;
  outline: none;
  cursor: pointer;
}

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

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  padding: 12px 24px;
  border-radius: 12px;
  font-size: 14px;
  z-index: 1000;
  animation: toastIn 0.3s ease;
  max-width: 90vw;
}

.toast.error {
  background: rgba(255, 45, 120, 0.9);
  border: 1px solid rgba(255, 45, 120, 0.5);
  color: white;
}

.toast.success {
  background: rgba(0, 255, 136, 0.15);
  border: 1px solid rgba(0, 255, 136, 0.3);
  color: var(--green);
}

.toast.warning {
  background: rgba(255, 215, 0, 0.15);
  border: 1px solid rgba(255, 215, 0, 0.3);
  color: var(--yellow);
}

@keyframes toastIn {
  from { opacity: 0; transform: translateX(-50%) translateY(20px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* Memory widget */
.memory-widget {
  position: fixed;
  bottom: 16px;
  right: 16px;
  z-index: 100;
  background: rgba(10, 10, 20, 0.9);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 10px 14px;
  font-size: 11px;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-dim);
  backdrop-filter: blur(10px);
}

/* Latent explorer */
.latent-pad {
  width: 200px;
  height: 200px;
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  background: rgba(0, 0, 0, 0.3);
  position: relative;
  cursor: crosshair;
  touch-action: none;
}

.latent-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px var(--cyan);
  position: absolute;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(123, 47, 247, 0.3); border-radius: 100px; }
::-webkit-scrollbar-thumb:hover { background: rgba(123, 47, 247, 0.5); }

/* Film strip */
.film-strip {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 12px 0;
  scroll-behavior: smooth;
}

.film-strip::-webkit-scrollbar { height: 4px; }

/* Error card */
.error-card {
  background: rgba(255, 45, 120, 0.08);
  border: 1px solid rgba(255, 45, 120, 0.2);
  border-radius: 12px;
  padding: 16px 20px;
  color: #ff6b8a;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in { animation: fadeIn 0.4s ease forwards; }

@keyframes spin {
  to { transform: rotate(360deg); }
}

.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--glass-border);
  border-top-color: var(--cyan);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  display: inline-block;
}

/* Header glow text */
.glow-text {
  text-shadow: 0 0 20px rgba(0, 212, 255, 0.5), 0 0 40px rgba(123, 47, 247, 0.3);
}

/* Footer */
.app-footer {
  text-align: center;
  padding: 32px 16px;
  color: var(--text-dim);
  font-size: 13px;
  border-top: 1px solid var(--glass-border);
  margin-top: 48px;
}

.app-footer a {
  color: var(--cyan);
  text-decoration: none;
}

.app-footer a:hover {
  text-decoration: underline;
}