/* Polyhedron Corpus Interactive Visual Gallery Stylesheet */
:root {
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-card: #162032;
  --bg-card-hover: #1e293b;
  --border-color: #1f293d;
  --border-focus: #38bdf8;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-cyan: #38bdf8;
  --accent-teal: #2dd4bf;
  --accent-indigo: #818cf8;
  --accent-purple: #c084fc;
  --accent-emerald: #34d399;
  --accent-rose: #fb7185;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -2px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.6), 0 4px 6px -4px rgba(0, 0, 0, 0.6);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Header & Navigation */
header {
  background: linear-gradient(180deg, #131b2e 0%, var(--bg-primary) 100%);
  border-bottom: 1px solid var(--border-color);
  padding: 1.25rem 2rem;
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(12px);
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-indigo));
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 16px rgba(56, 189, 248, 0.35);
}

.brand-icon svg {
  width: 22px;
  height: 22px;
  fill: #fff;
}

.brand h1 {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(90deg, #f8fafc 0%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-badge {
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent-cyan);
  border: 1px solid rgba(56, 189, 248, 0.25);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: 9999px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.search-bar {
  position: relative;
  width: 280px;
}

.search-bar input {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.5rem 0.85rem 0.5rem 2.25rem;
  color: var(--text-primary);
  font-size: 0.875rem;
  outline: none;
  transition: all 0.2s ease;
}

.search-bar input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.15);
}

.search-icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  width: 16px;
  height: 16px;
}

/* Category Filter Bar */
.filter-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.category-pills {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  overflow-x: auto;
  padding-bottom: 0.25rem;
}

.pill-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.35rem 0.75rem;
  border-radius: 9999px;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s ease;
}

.pill-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--text-muted);
}

.pill-btn.active {
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  font-weight: 600;
}

.filter-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.select-control {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.8125rem;
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  outline: none;
  cursor: pointer;
}

/* Main Layout Grid */
.main-container {
  display: grid;
  grid-template-columns: 1fr 460px;
  gap: 1.5rem;
  padding: 1.5rem 2rem;
  flex: 1;
  max-width: 1800px;
  margin: 0 auto;
  width: 100%;
}

@media (max-width: 1200px) {
  .main-container {
    grid-template-columns: 1fr;
  }
}

/* Left: Polyhedra Grid */
.gallery-section {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.gallery-stats {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.polyhedra-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
}

.poly-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.875rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.poly-card:hover {
  transform: translateY(-2px);
  background: var(--bg-card-hover);
  border-color: var(--accent-cyan);
  box-shadow: 0 8px 20px -4px rgba(56, 189, 248, 0.15);
}

.poly-card.selected {
  border-color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.08);
  box-shadow: 0 0 0 2px var(--accent-cyan);
}

.card-img-wrapper {
  width: 130px;
  height: 130px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.75rem;
  position: relative;
}

.card-img-wrapper img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.4));
  transition: transform 0.2s ease;
}

.poly-card:hover .card-img-wrapper img {
  transform: scale(1.05);
}

.card-info {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  text-align: center;
}

.card-category {
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-cyan);
  font-weight: 600;
}

.card-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  width: 100%;
}

.card-metrics {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  margin-top: 0.4rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.card-metrics span {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
}

.card-metrics b {
  color: var(--text-secondary);
  font-weight: 600;
}

/* Infinite Scroll Sentinel & Status */
.scroll-sentinel {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2.5rem 1rem;
  margin-top: 1rem;
}

.scroll-status {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.5rem 1.25rem;
  border-radius: 9999px;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
}

.scroll-status.all-loaded {
  background: rgba(56, 189, 248, 0.08);
  border-color: rgba(56, 189, 248, 0.25);
  color: var(--accent-cyan);
}


/* Right: 3D Inspector Panel (Sticky) */
.inspector-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  position: sticky;
  top: 7rem;
  height: calc(100vh - 8.5rem);
  box-shadow: var(--shadow-lg);
  overflow-y: auto;
}

.inspector-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.5rem;
}

.inspector-title-group h2 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.inspector-title-group p {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

.badge-tag {
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent-cyan);
  border: 1px solid rgba(56, 189, 248, 0.3);
  font-size: 0.6875rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
}

/* 3D WebGL Canvas Area */
.canvas-wrapper {
  width: 100%;
  height: 280px;
  background: radial-gradient(circle at center, #1b263b 0%, #0d131f 100%);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

#viewport-canvas {
  width: 100%;
  height: 100%;
  display: block;
  outline: none;
}

.viewport-overlay {
  position: absolute;
  bottom: 0.6rem;
  right: 0.6rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.overlay-btn {
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--text-primary);
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 0.75rem;
  transition: all 0.15s ease;
}

.overlay-btn:hover {
  background: rgba(56, 189, 248, 0.3);
  border-color: var(--accent-cyan);
}

.overlay-btn.active {
  background: var(--accent-cyan);
  color: #0b0f19;
}

/* Side-by-Side SVG Preview Card */
.comparison-section {
  display: flex;
  gap: 0.75rem;
  background: rgba(11, 15, 25, 0.5);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.75rem;
  align-items: center;
}

.svg-preview-box {
  width: 80px;
  height: 80px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
  flex-shrink: 0;
}

.svg-preview-box img {
  max-width: 90%;
  max-height: 90%;
}

.comparison-details {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  font-size: 0.75rem;
}

.comparison-details b {
  color: var(--text-primary);
  font-size: 0.8125rem;
}

.comparison-details span {
  color: var(--text-muted);
}

/* Metric Invariants Cards */
.metrics-table {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
}

.metric-cell {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.6rem;
  text-align: center;
}

.metric-cell .label {
  font-size: 0.6875rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.metric-cell .value {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 0.15rem;
}

/* Verification Badges */
.verification-status-box {
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-radius: var(--radius-md);
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.verification-status-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--accent-emerald);
}

.gates-pills {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.gate-pill {
  font-size: 0.6875rem;
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  font-weight: 600;
}

/* Inspector Actions */
.inspector-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
  margin-top: auto;
}

.btn-action {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.55rem;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s ease;
}

.btn-action:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.btn-primary {
  background: linear-gradient(135deg, #0284c7, #2563eb);
  border: none;
  color: #fff;
}

.btn-primary:hover {
  background: linear-gradient(135deg, #0369a1, #1d4ed8);
  color: #fff;
}