/* ==========================================================================
   3D CACHE THRASHING: LIGHT THEME & HARDWARE HUD
   Precision Industrial Aesthetic • Minimalist Floating Interface
   ========================================================================== */

:root {
  --bg-page: #f8fafc;
  --bg-surface: rgba(255, 255, 255, 0.88);
  --bg-card: rgba(255, 255, 255, 0.94);
  --bg-card-hover: #ffffff;
  
  --border: rgba(15, 23, 42, 0.1);
  --border-strong: rgba(15, 23, 42, 0.2);
  --border-focus: rgba(2, 132, 199, 0.4);
  
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  
  --blue: #0284c7;
  --blue-hover: #0369a1;
  --blue-light: rgba(2, 132, 199, 0.1);
  --indigo: #4f46e5;
  --indigo-light: rgba(79, 70, 229, 0.1);
  --amber: #d97706;
  --amber-light: rgba(217, 119, 6, 0.12);
  --emerald: #059669;
  --red: #dc2626;
  --red-light: rgba(220, 38, 38, 0.1);
  
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'Space Grotesk', var(--font-sans);
  --font-mono: 'Fira Code', monospace;
  
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 14px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 30px rgba(15, 23, 42, 0.1);
}

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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg-page);
  color: var(--text-primary);
  font-family: var(--font-sans);
  user-select: none;
  -webkit-font-smoothing: antialiased;
}

.text-blue { color: var(--blue) !important; }
.text-indigo { color: var(--indigo) !important; }
.text-amber { color: var(--amber) !important; }
.text-red { color: var(--red) !important; }

/* ==========================================================================
   TOP APPLICATION BAR (LIGHT THEME)
   ========================================================================== */

.app-header {
  height: 56px;
  padding: 0 1.5rem;
  background: var(--bg-surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.chip-icon {
  width: 30px;
  height: 30px;
  background: linear-gradient(135deg, #0284c7, #4f46e5);
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(2, 132, 199, 0.35);
}

.brand-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.step-indicator-pill {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: rgba(241, 245, 249, 0.85);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 0.3rem 0.95rem;
  max-width: 620px;
  box-shadow: var(--shadow-sm);
}

.pill-step {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  background: var(--blue-light);
  color: var(--blue);
  border: 1px solid rgba(2, 132, 199, 0.25);
  padding: 0.15rem 0.5rem;
  border-radius: 12px;
  white-space: nowrap;
}

.pill-step.thrash {
  background: var(--red);
  color: #ffffff;
  border-color: var(--red);
}

.pill-desc {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.camera-controls {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.cam-btn {
  background: rgba(241, 245, 249, 0.8);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.cam-btn:hover {
  background: #e2e8f0;
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.cam-btn.active {
  background: var(--blue);
  color: #ffffff;
  border-color: var(--blue);
  box-shadow: 0 2px 8px rgba(2, 132, 199, 0.35);
}

/* ==========================================================================
   FULLSCREEN 3D STAGE & CANVAS
   ========================================================================== */

.stage-container {
  width: 100vw;
  height: 100vh;
  position: relative;
  background: radial-gradient(circle at 50% 35%, #ffffff 0%, #f1f5f9 60%, #e2e8f0 100%);
}

#threeCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* ==========================================================================
   BUS SPEED RATE MONITOR (FLOATING UNDER HEADER)
   Visualizes the 2.0s Fast Bus vs 5.0s Slow Bus speed difference
   ========================================================================== */

.bus-rate-bar {
  position: absolute;
  top: 68px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 1.25rem;
  background: var(--bg-surface);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 0.35rem 1.1rem;
  box-shadow: var(--shadow-md);
  z-index: 40;
}

.bus-badge {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
}

.badge-fast {
  color: var(--blue);
}

.badge-fast .speed-tag {
  background: var(--blue-light);
  border: 1px solid rgba(2, 132, 199, 0.25);
  padding: 0.1rem 0.45rem;
  border-radius: 8px;
}

.bus-divider {
  width: 1px;
  height: 16px;
  background: var(--border-strong);
}

.badge-slow {
  color: var(--amber);
}

.badge-slow .speed-tag {
  background: var(--amber-light);
  border: 1px solid rgba(217, 119, 6, 0.25);
  padding: 0.1rem 0.45rem;
  border-radius: 8px;
}

/* Transit Live Progress Badge */
.transit-live-pill {
  position: absolute;
  top: 110px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-surface);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-focus);
  border-radius: 20px;
  padding: 0.35rem 0.95rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
  opacity: 0;
  transition: opacity 0.25s ease;
  pointer-events: none;
  z-index: 40;
}

.transit-live-pill.active {
  opacity: 1;
}

.transit-bar-wrap {
  width: 80px;
  height: 6px;
  background: #e2e8f0;
  border-radius: 3px;
  overflow: hidden;
}

.transit-bar-fill {
  height: 100%;
  width: 0%;
  background: var(--blue);
  border-radius: 3px;
  transition: width 0.05s linear;
}

.transit-bar-fill.slow {
  background: var(--amber);
}

/* ==========================================================================
   INTERACTIVE HOVER TOOLTIPS FOR CPU, CACHE, RAM
   ========================================================================== */

.hover-hud {
  position: absolute;
  top: 150px;
  left: 28px;
  right: 28px;
  display: flex;
  justify-content: space-between;
  pointer-events: none;
  z-index: 30;
}

.hud-item {
  pointer-events: auto;
  position: relative;
  cursor: pointer;
}

.hud-badge {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 0.4rem 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.55rem;
  box-shadow: var(--shadow-md);
  transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

.hud-item:hover .hud-badge {
  background: var(--bg-card-hover);
  border-color: var(--border-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.tag-title {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-primary);
}

.dot-status {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 6px rgba(2, 132, 199, 0.6);
}

.tag-live {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  background: var(--blue-light);
  color: var(--blue);
  border: 1px solid rgba(2, 132, 199, 0.2);
  padding: 0.1rem 0.45rem;
  border-radius: 5px;
}

.tag-slots {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  background: var(--indigo-light);
  color: var(--indigo);
  border: 1px solid rgba(79, 70, 229, 0.2);
  padding: 0.1rem 0.45rem;
  border-radius: 5px;
}

.tag-blocks {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  background: var(--amber-light);
  color: var(--amber);
  border: 1px solid rgba(217, 119, 6, 0.2);
  padding: 0.1rem 0.45rem;
  border-radius: 5px;
}

/* Tooltip Popup on Hover */
.hud-tooltip {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  width: 250px;
  background: var(--bg-card);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  padding: 0.85rem 1.05rem;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transform: translateY(6px);
  transition: opacity 0.22s ease, transform 0.22s ease;
  z-index: 60;
}

.hud-ram .hud-tooltip {
  left: auto;
  right: 0;
}

.hud-item:hover .hud-tooltip {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.hud-tooltip h4 {
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.hud-tooltip p {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.45;
  margin-bottom: 0.6rem;
}

.tooltip-meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  border-top: 1px solid var(--border);
  padding-top: 0.45rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   COLLISION & THRASHING ALERT BANNER
   ========================================================================== */

.thrash-banner {
  position: absolute;
  top: 155px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--red);
  border: 1px solid #ffffff;
  border-radius: 8px;
  padding: 0.6rem 1.4rem;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: #ffffff;
  box-shadow: 0 8px 25px rgba(220, 38, 38, 0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
  z-index: 50;
}

.thrash-banner.active {
  opacity: 1;
  animation: pulseThrashBanner 0.75s infinite alternate ease-in-out;
}

@keyframes pulseThrashBanner {
  0% { transform: translateX(-50%) scale(1); }
  100% { transform: translateX(-50%) scale(1.03); }
}

/* ==========================================================================
   FLOATING BOTTOM PLAYER CONTROLS (LIGHT THEME)
   ========================================================================== */

.player-dock {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 0.75rem 1.35rem;
  display: flex;
  align-items: center;
  gap: 1.4rem;
  box-shadow: var(--shadow-lg);
  z-index: 50;
}

.player-buttons {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.btn {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.45rem 0.95rem;
  border-radius: 7px;
  border: 1px solid var(--border);
  background: rgba(241, 245, 249, 0.9);
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.btn:hover {
  background: #e2e8f0;
  border-color: var(--border-strong);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--blue);
  border-color: var(--blue);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--blue-hover);
  border-color: var(--blue-hover);
  box-shadow: 0 2px 10px rgba(2, 132, 199, 0.35);
}

.btn-ghost {
  border-color: transparent;
  background: transparent;
  color: var(--text-muted);
}

.btn-ghost:hover {
  background: rgba(241, 245, 249, 0.8);
  color: var(--text-primary);
}

/* 7 Step Timeline Dots */
.step-dots {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.dot {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(241, 245, 249, 0.9);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.dot:hover {
  background: #e2e8f0;
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.dot.active {
  background: var(--blue);
  color: #ffffff;
  border-color: var(--blue);
  box-shadow: 0 2px 10px rgba(2, 132, 199, 0.4);
  transform: scale(1.12);
}

/* Delay Readout Pill */
.delay-pill {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: rgba(241, 245, 249, 0.85);
  padding: 0.4rem 0.8rem;
  border-radius: 7px;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--text-secondary);
}

@media (max-width: 960px) {
  .step-indicator-pill { max-width: 320px; }
  .bus-rate-bar { display: none; }
  .player-dock { width: 94%; justify-content: space-between; gap: 0.5rem; padding: 0.6rem 0.9rem; }
}