/* Vector HNSW Search Engine - Design System & Styles */
:root {
  --bg-primary: #080b12;
  --bg-secondary: #0f1422;
  --bg-card: rgba(18, 24, 38, 0.75);
  --bg-hover: rgba(30, 41, 59, 0.6);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(6, 182, 212, 0.5);

  --accent-cyan: #06b6d4;
  --accent-blue: #3b82f6;
  --accent-purple: #8b5cf6;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;

  --layer-2: #f43f5e; /* Rose for Layer 2 top highway */
  --layer-1: #8b5cf6; /* Purple for Layer 1 */
  --layer-0: #06b6d4; /* Cyan for Layer 0 */
  --query-color: #facc15; /* Yellow for Query */

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 10% 20%, rgba(6, 182, 212, 0.04) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(244, 63, 94, 0.04) 0%, transparent 40%);
}

.app-layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.75rem;
  background: rgba(11, 15, 25, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  z-index: 50;
}

.brand-badge {
  display: inline-block;
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--accent-rose);
  background: rgba(244, 63, 94, 0.12);
  border: 1px solid rgba(244, 63, 94, 0.3);
  padding: 0.15rem 0.5rem;
  border-radius: 9999px;
  margin-bottom: 0.25rem;
}

.brand h1 {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.brand h1 span {
  background: linear-gradient(135deg, var(--accent-rose), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.header-stats {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.stat-pill {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.stat-label {
  color: var(--text-muted);
}

.stat-val {
  font-weight: 700;
  color: var(--text-primary);
}

.text-emerald { color: var(--accent-emerald); }
.text-cyan { color: var(--accent-cyan); }

.github-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-subtle);
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: all 0.2s ease;
}

.github-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.2);
}

/* Main Content Grid */
.main-content {
  display: grid;
  grid-template-columns: 1fr 400px;
  flex: 1;
  gap: 1px;
  background-color: var(--border-subtle);
}

/* Left: Visualizer Container */
.visualizer-container {
  background: var(--bg-primary);
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  gap: 1rem;
}

.canvas-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.layer-selector {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.view-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-right: 0.4rem;
}

.layer-btn {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
}

.layer-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-primary);
}

.layer-btn.active {
  background: rgba(6, 182, 212, 0.15);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  font-weight: 700;
}

.canvas-actions {
  display: flex;
  gap: 0.5rem;
}

.primary-btn {
  background: linear-gradient(135deg, var(--accent-rose), var(--accent-purple));
  color: #fff;
  border: none;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.primary-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(244, 63, 94, 0.3);
}

.glass-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.glass-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}

.canvas-wrapper {
  position: relative;
  background: #04060c;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.8);
}

#hnsw-canvas {
  width: 100%;
  height: 520px;
  display: block;
}

.canvas-hud {
  position: absolute;
  top: 1rem;
  left: 1rem;
  background: rgba(9, 13, 22, 0.8);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.9rem;
  display: flex;
  gap: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.hud-label {
  color: var(--text-muted);
}

.canvas-footer-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.legend-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
}

.color-l2 { background-color: var(--layer-2); box-shadow: 0 0 6px var(--layer-2); }
.color-l1 { background-color: var(--layer-1); box-shadow: 0 0 6px var(--layer-1); }
.color-l0 { background-color: var(--layer-0); box-shadow: 0 0 6px var(--layer-0); }
.color-query { background-color: var(--query-color); box-shadow: 0 0 8px var(--query-color); }
.color-path { background-color: #f59e0b; }

/* Right: Search Panel */
.search-panel {
  background: var(--bg-secondary);
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  gap: 1.25rem;
  overflow-y: auto;
}

.panel-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.panel-card h3 {
  font-size: 0.95rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.panel-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.35;
}

.search-box-group {
  display: flex;
  gap: 0.4rem;
}

.search-input {
  flex: 1;
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  padding: 0.5rem 0.8rem;
  border-radius: var(--radius-sm);
  outline: none;
}

.search-input:focus {
  border-color: var(--accent-cyan);
}

.search-btn {
  background: var(--accent-cyan);
  color: #000;
  font-weight: 700;
  font-size: 0.85rem;
  border: none;
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.mode-toggles {
  display: flex;
  gap: 0.85rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.radio-label {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  cursor: pointer;
}

.slider-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  border-top: 1px solid var(--border-subtle);
  padding-top: 0.6rem;
}

.slider-row {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.slider-row input[type="range"] {
  accent-color: var(--accent-cyan);
}

/* Results List */
.results-container {
  display: flex;
  flex-direction: column;
  flex: 1;
  gap: 0.5rem;
}

.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
}

.sub-meta {
  color: var(--accent-cyan);
}

.results-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  overflow-y: auto;
}

.result-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  transition: all 0.15s ease;
}

.result-card:hover {
  background: var(--bg-hover);
  border-color: rgba(6, 182, 212, 0.3);
}

.result-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.result-id {
  font-weight: 700;
  color: var(--text-primary);
}

.result-score {
  color: var(--accent-emerald);
  font-weight: 700;
}

.result-text {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.35;
}

/* SQ8 Card */
.sq8-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.sq8-card h4 {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-rose);
  margin-bottom: 0.6rem;
}

.sq8-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  text-align: center;
}

.sq8-val {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--text-primary);
}

.sq8-sub {
  font-size: 0.65rem;
  color: var(--text-muted);
}

/* Footer */
.app-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1.75rem;
  background: #060910;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.footer-links span {
  color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 1024px) {
  .main-content {
    grid-template-columns: 1fr;
  }
}