/* =============================================================================
   oNeura  -  dONN Pong  -  Dark Theme
   FEP/STDP Implementation
   ============================================================================= */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Jacquard+24&family=IBM+Plex+Mono:wght@300;400;500;600&display=swap');

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

:root {
  --bg: #0a0a0a;
  --surface: #111111;
  --surface-2: #1a1a1a;
  --border: rgba(255, 255, 255, 0.08);
  --text: #e0e0e0;
  --text-muted: #666666;
  --green: #00ff88;
  --green-dim: #00cc66;
  --teal: #5eead4;
  --teal-dim: rgba(94,234,212,0.15);
  --blue: #00aaff;
  --red: #ff4466;
  --orange: #ff8800;
  --font-ui: 'Inter', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
  --font-display: 'Jacquard 24', serif;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── Header ── */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  border-bottom: 1px solid var(--border);
  position: relative;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.site-link { text-decoration: none; }
.site-link-wordmark {
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 600;
  color: rgba(255,255,255,0.5);
  letter-spacing: 0.08em;
  line-height: 1;
  text-transform: uppercase;
}

.back-link {
  color: rgba(255,255,255,0.45);
  text-decoration: none;
  font-size: 11px;
  font-family: var(--font-ui);
  letter-spacing: 0.02em;
  transition: color 0.2s;
}

.back-link:hover {
  color: #fff;
}

.header-center {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-brand-text {
  font-family: 'Jacquard 24', serif;
  font-size: 18px;
  color: rgba(255,255,255,0.9);
}

.header-subtitle {
  font-family: var(--font-ui);
  font-size: 10px;
  font-weight: 500;
  color: rgba(255,255,255,0.38);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-nav-link {
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 500;
  color: rgba(255,255,255,0.45);
  text-decoration: none;
  letter-spacing: 0.02em;
}
.header-nav-link:hover { color: var(--teal); }

.header-title {
  font-family: 'Jacquard 24', serif;
  font-size: 28px;
  color: rgba(255,255,255,0.9);
  letter-spacing: 2px;
  line-height: 1;
}

.header-brand {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 1px;
}

.header-brand span {
  color: var(--teal);
}

/* ═══════════════════════════════════════════════════════════════════════
   TRAINING PHASE
   ═══════════════════════════════════════════════════════════════════════ */
.training-phase {
  padding: 24px;
  max-width: 800px;
  margin: 0 auto;
}

.training-container {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
}

.training-header {
  text-align: center;
  margin-bottom: 24px;
}

.training-title {
  font-family: 'Jacquard 24', serif;
  font-size: 36px;
  color: rgba(255,255,255,0.92);
  letter-spacing: 3px;
  margin-bottom: 8px;
}

.training-subtitle {
  font-family: var(--font-ui);
  font-size: 13px;
  color: rgba(255,255,255,0.5);
  line-height: 1.6;
}

.training-subtitle strong {
  color: rgba(255,255,255,0.78);
  font-weight: 500;
}

/* Progress Bar */
.training-progress-section {
  margin-bottom: 20px;
}

.training-progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.training-progress-bar {
  width: 100%;
  height: 8px;
  background: var(--surface-2);
  border-radius: 4px;
  overflow: hidden;
}

.training-progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, rgba(94,234,212,0.5), var(--teal));
  border-radius: 4px;
  transition: width 0.3s ease;
}

/* Learning Curve Chart */
.training-chart-section {
  margin-bottom: 20px;
}

.training-chart-label {
  font-family: var(--font-ui);
  font-size: 10px;
  font-weight: 500;
  color: rgba(255,255,255,0.38);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

#training-chart {
  display: block;
  width: 100%;
  height: 250px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #0a0a0a;
}

/* Training Stats */
.training-stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-bottom: 20px;
}

.training-stat {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 12px;
  text-align: center;
}

.training-stat-label {
  font-family: var(--font-ui);
  font-size: 9px;
  font-weight: 500;
  color: rgba(255,255,255,0.38);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.training-stat-value {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 500;
  color: var(--teal);
  line-height: 1;
}

/* Training Complete */
.training-complete {
  text-align: center;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.training-complete-text {
  font-size: 13px;
  color: var(--text);
  margin-bottom: 16px;
}

.training-complete-text span {
  color: var(--teal);
  font-weight: 600;
}

.training-complete-text .dimmed {
  color: var(--text-muted);
  font-weight: 400;
  font-size: 11px;
}

.play-btn {
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #050a0e;
  background: var(--teal);
  border: none;
  border-radius: 6px;
  padding: 12px 32px;
  cursor: pointer;
  transition: all 0.2s;
}

.play-btn:hover {
  background: #81f5e3;
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(94, 234, 212, 0.3);
}

/* ═══════════════════════════════════════════════════════════════════════
   PLAY PHASE
   ═══════════════════════════════════════════════════════════════════════ */
.play-phase {}

/* ── Main Layout ── */
.main-container {
  display: flex;
  justify-content: center;
  align-items: stretch;
  gap: 0;
  padding: 20px 24px 12px;
  max-width: 1200px;
  margin: 0 auto;
}

/* ── Game Canvas ── */
.game-wrapper {
  flex: 1;
  position: relative;
  border: 1px solid var(--border);
  border-radius: 8px 0 0 8px;
  overflow: hidden;
  background: #0a0a0a;
}

#pong-canvas {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 460px;
  cursor: none;
}

/* ── Brain Viz ── */
.brain-wrapper {
  flex: 0 0 300px;
  border: 1px solid var(--border);
  border-left: none;
  border-radius: 0 8px 8px 0;
  overflow: hidden;
  background: #080808;
  position: relative;
  display: flex;
  flex-direction: column;
}

.brain-label {
  position: absolute;
  top: 4px;
  right: 8px;
  font-size: 8px;
  color: var(--text-muted);
  letter-spacing: 1px;
  text-transform: uppercase;
  z-index: 1;
  opacity: 0.5;
}

#brain-canvas {
  display: block;
  width: 100%;
  flex: 1;
  min-height: 0;
}

/* ── Controls Bar ── */
.controls-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 12px 24px;
  max-width: 1200px;
  margin: 0 auto;
  flex-wrap: wrap;
}

.mode-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 12px;
  cursor: pointer;
  transition: border-color 0.2s;
}

.mode-toggle:hover {
  border-color: var(--teal);
}

.mode-toggle-switch {
  width: 36px;
  height: 18px;
  background: var(--surface-2);
  border-radius: 9px;
  position: relative;
  transition: background 0.3s;
}

.mode-toggle-switch.active {
  background: rgba(94,234,212,0.5);
}

.mode-toggle-switch::after {
  content: '';
  position: absolute;
  width: 14px;
  height: 14px;
  background: #fff;
  border-radius: 50%;
  top: 2px;
  left: 2px;
  transition: transform 0.3s;
}

.mode-toggle-switch.active::after {
  transform: translateX(18px);
}

.mode-label {
  font-family: var(--font-ui);
  font-size: 11px;
  color: var(--text);
  letter-spacing: 0.02em;
}

.mode-label .mode-tag {
  color: var(--teal);
  font-weight: 600;
}

.mode-label .mode-tag.hh {
  color: var(--orange);
}

.retrain-btn {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1px;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 16px;
  cursor: pointer;
  transition: all 0.2s;
}

.retrain-btn:hover {
  border-color: var(--orange);
  color: var(--orange);
}

/* ── Learning Curve Mini Panel ── */
.learning-curve-panel {
  max-width: 460px;
  margin: 0 auto;
  padding: 0 24px 12px;
}

.learning-curve-label {
  font-family: var(--font-ui);
  font-size: 9px;
  font-weight: 500;
  color: rgba(255,255,255,0.38);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 4px;
  text-align: center;
}

#mini-chart {
  display: block;
  width: 100%;
  height: 120px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #0a0a0a;
}

/* ── Stats Panel ── */
.stats-panel {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  padding: 0 24px 12px;
  max-width: 1200px;
  margin: 0 auto;
}

.stat-item {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 10px 12px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  /* Collapse borders between cells */
  margin-left: -1px;
  margin-top: -1px;
}

.stat-item:nth-child(1),
.stat-item:nth-child(5) {
  margin-left: 0;
}

.stat-label {
  font-family: var(--font-ui);
  font-size: 9px;
  font-weight: 500;
  color: rgba(255,255,255,0.38);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 500;
  color: var(--teal);
  line-height: 1;
}

.stat-value.blue {
  color: var(--blue);
}

.stat-value.orange {
  color: var(--orange);
}

.stat-value.red {
  color: var(--red);
}

/* ── Footer ── */
.footer {
  padding: 16px 24px;
  max-width: 1200px;
  margin: 0 auto;
  border-top: 1px solid var(--border);
  margin-top: 12px;
}

.footer-text {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 800px;
  margin: 0 auto;
}

.footer-text strong {
  color: var(--text);
  font-weight: 500;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 10px;
  font-size: 11px;
  width: fit-content;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--teal);
}


/* ── Responsive ── */
@media (max-width: 960px) {
  .main-container {
    flex-direction: column;
    align-items: center;
    padding: 12px 12px 8px;
    gap: 12px;
  }

  #pong-canvas {
    width: 100%;
    min-height: 300px;
    height: auto;
    aspect-ratio: 3 / 2;
  }

  .game-wrapper {
    width: 100%;
    max-width: 600px;
    border-radius: 8px;
  }

  .brain-wrapper {
    width: 100%;
    max-width: 600px;
    flex: none;
    border-left: 1px solid var(--border);
    border-radius: 8px;
  }

  #brain-canvas {
    width: 100%;
    max-width: 600px;
    height: 220px;
    min-height: 220px;
  }
  
  .header {
    padding: 12px 16px;
    flex-wrap: wrap;
    gap: 8px;
  }
  
  .header-title {
    font-size: 22px;
  }
  
  .stats-panel {
    grid-template-columns: repeat(2, 1fr);
    padding: 8px 12px;
    gap: 6px;
  }
  
  .stat-item {
    padding: 6px 8px;
  }
  
  .stat-value {
    font-size: 18px;
  }
  
  .footer {
    padding: 12px 16px;
  }
  
  .controls-bar {
    padding: 8px 12px;
  }
  
  .training-container {
    padding: 20px;
  }
  
  .training-stats-row {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .header-title {
    font-size: 18px;
  }
  
  .stats-panel {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ── POV Camera ── */
.pov-wrapper {
  margin-top: 4px;
  padding: 6px;
  text-align: center;
  background: #050505;
  border-bottom: 1px solid var(--border);
}
.pov-label {
  font-family: var(--font-ui);
  font-size: 9px;
  font-weight: 500;
  color: rgba(255,255,255,0.35);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 2px;
}
#pov-canvas {
  border: 1px solid rgba(255,255,255,0.09);
  border-radius: 2px;
  width: 100%;
  max-width: 280px;
  image-rendering: pixelated;
}

/* ── Jacquard Font ── */
.jacquard, .training-title {
  font-family: 'Jacquard 24', serif !important;
  text-transform: none;
}

/* ── Retina Toggle ── */
.retina-toggle-label {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 12px;
  cursor: pointer;
  transition: border-color 0.2s;
  font-family: var(--font-ui);
  font-size: 11px;
  color: var(--text);
  letter-spacing: 0.02em;
}

.retina-toggle-label:hover {
  border-color: var(--blue);
}

.retina-toggle-label input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 36px;
  height: 18px;
  background: var(--surface-2);
  border-radius: 9px;
  position: relative;
  cursor: pointer;
  transition: background 0.3s;
  flex-shrink: 0;
}

.retina-toggle-label input[type="checkbox"]::after {
  content: '';
  position: absolute;
  width: 14px;
  height: 14px;
  background: #fff;
  border-radius: 50%;
  top: 2px;
  left: 2px;
  transition: transform 0.3s;
}

.retina-toggle-label input[type="checkbox"]:checked {
  background: rgba(94,234,212,0.6);
}

.retina-toggle-label input[type="checkbox"]:checked::after {
  transform: translateX(18px);
}

.retina-label {
  color: var(--teal);
  font-weight: 600;
}

.retina-desc {
  color: rgba(255,255,255,0.38);
  font-size: 10px;
}

.retina-note {
  font-size: 10px;
  color: var(--text-muted);
  text-align: center;
  padding: 0 24px 4px;
  max-width: 1100px;
  margin: 0 auto;
  font-style: italic;
}

/* ── Animations ── */
@keyframes pulse-green {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

.pulse {
  animation: pulse-green 1.5s ease-in-out infinite;
}

/* ── Hidden utility ── */
.hidden {
  display: none !important;
}