:root {
  /* Dark Mode - Amber Gold Theme */
  --bg-color: #1A1408;
  --surface-color: rgba(36, 28, 14, 0.7);
  --surface-border: rgba(245, 158, 11, 0.2);
  --text-primary: #FDF6E3;
  --text-secondary: #D4D4D8;
  
  --primary: #F59E0B; /* Amber 500 */
  --primary-hover: #D97706; /* Amber 600 */
  --secondary: #FBBF24; /* Amber 400 */
  --accent: #6366F1; /* Indigo 500 */
  
  --input-bg: rgba(26, 20, 8, 0.8);
  --input-border: rgba(245, 158, 11, 0.3);
  --hover-bg: rgba(245, 158, 11, 0.1);
  
  --success: #10B981;
  --success-bg: rgba(16, 185, 129, 0.15);
  --warning: #F59E0B;
  --warning-bg: rgba(245, 158, 11, 0.15);
  --danger: #EF4444;
  --danger-bg: rgba(239, 68, 68, 0.15);

  --radius: 12px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', Consolas, monospace;
}

.light-mode {
  --bg-color: #FFFBEB;
  --surface-color: rgba(255, 255, 255, 0.85);
  --surface-border: rgba(245, 158, 11, 0.3);
  --text-primary: #27272A;
  --text-secondary: #52525B;
  
  --input-bg: rgba(255, 255, 255, 0.9);
  --input-border: rgba(245, 158, 11, 0.4);
  --hover-bg: rgba(245, 158, 11, 0.08);
  
  --shadow: 0 8px 25px rgba(245, 158, 11, 0.1);
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
  transition: background-color var(--transition), color var(--transition);
}

.hidden { display: none !important; }
.mt-md { margin-top: 1rem; }
.text-success { color: var(--success) !important; }
.code-font { font-family: var(--font-mono); }

/* Layout */
.app-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  padding: 1.5rem;
  gap: 1.5rem;
}

.main-content {
  display: grid;
  grid-template-columns: 450px 1fr;
  gap: 1.5rem;
  flex: 1;
  min-height: 0; /* overflow context */
}

@media (max-width: 1024px) {
  .main-content {
    grid-template-columns: 1fr;
    height: auto;
  }
  .app-container { height: auto; }
}

/* Glass Panels */
.glass-panel {
  background: var(--surface-color);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--surface-border);
  box-shadow: var(--shadow);
  border-radius: var(--radius);
}

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  flex-shrink: 0;
}

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

.logo h1 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
}

.header-actions {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.icon-btn, .btn {
  font-family: var(--font-family);
  cursor: pointer;
  border-radius: 8px;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.icon-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 0.5rem;
  width: 36px;
  height: 36px;
}

.icon-btn:hover, .btn-icon:hover {
  background: var(--hover-bg);
  color: var(--primary);
}

.btn-icon {
  cursor: pointer;
  padding: 0.25rem;
  border-radius: 4px;
  display: inline-flex;
  transition: var(--transition);
  color: var(--text-secondary);
}

.btn {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  gap: 0.5rem;
}

.btn-sm {
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--surface-border);
  color: var(--text-primary);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--hover-bg);
}

/* Input Section */
.input-section {
  display: flex;
  flex-direction: column;
  padding: 1.25rem;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.section-header h2, .analysis-section h2 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
}

.code-editor {
  flex: 1;
  width: 100%;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.5;
  padding: 1rem;
  border-radius: 8px;
  resize: none;
  outline: none;
  white-space: pre;
  overflow: auto;
}

.code-editor:focus {
  border-color: var(--primary);
  box-shadow: inset 0 0 0 1px var(--primary);
}

/* Analysis Section */
.analysis-section {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  overflow-y: auto;
  padding-right: 0.5rem;
}

.analysis-section::-webkit-scrollbar { width: 8px; }
.analysis-section::-webkit-scrollbar-thumb { background: var(--surface-border); border-radius: 4px; }

/* Metrics */
.overview-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

@media (max-width: 1200px) {
  .overview-grid { grid-template-columns: repeat(2, 1fr); }
}

.metric-card {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.metric-card h3 {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.metric-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

/* Layer Stack Visualization */
.analysis-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.layer-stack-container {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
}

.layer-stack-container h2 { margin-bottom: 1rem; }

.layer-stack {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
  background: var(--input-bg);
  padding: 1rem;
  border-radius: 8px;
  border: 1px solid var(--input-border);
  justify-content: flex-end; /* stack grows upward visually */
  min-height: 250px;
}

.layer-block {
  background: rgba(99, 102, 241, 0.2);
  border: 1px solid var(--accent);
  border-radius: 4px;
  padding: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-primary);
  transition: var(--transition);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.layer-block:hover {
  transform: scale(1.02);
  z-index: 10;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.layer-block.base-image {
  background: rgba(245, 158, 11, 0.2);
  border-color: var(--primary);
}
.layer-block.run-cache {
  background: rgba(239, 68, 68, 0.2);
  border-color: var(--danger);
  border-style: dashed;
}

/* Insights */
.right-panes {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.insights-panel {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
}
.insights-panel h2 { margin-bottom: 1rem; }

.insight-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  font-size: 0.875rem;
}

.insight-list li {
  padding-left: 1.5rem;
  position: relative;
}

.insight-list li::before {
  content: "•";
  color: var(--primary);
  position: absolute;
  left: 0.5rem;
  font-size: 1.2rem;
  line-height: 1;
}

.empty-state {
  color: var(--text-secondary);
  font-style: italic;
  text-align: center;
  padding: 2rem 0;
}

.insight-list li.empty-state::before { display: none; }

/* Base Comparison */
.comparison-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
}

.comparison-row:nth-child(3) {
  justify-content: center;
  color: var(--text-secondary);
}

.size-badge {
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}
.size-badge.warning { background: var(--warning-bg); color: var(--warning); }
.size-badge.success { background: var(--success-bg); color: var(--success); }

/* Table Breakdown */
.breakdown-panel {
  padding: 1.25rem;
}
.breakdown-panel h2 { margin-bottom: 1rem; }

.table-container {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  font-family: var(--font-mono);
}

.data-table th, .data-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--surface-border);
}

.data-table th {
  font-family: var(--font-family);
  color: var(--text-secondary);
  font-weight: 500;
}

.data-table tr:hover td { background: var(--hover-bg); }
.data-table tr:last-child td { border-bottom: none; }

.tag {
  display: inline-block;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.7rem;
  background: var(--warning-bg);
  color: var(--warning);
  font-family: var(--font-family);
}
.tag.danger { background: var(--danger-bg); color: var(--danger); }
.tag.success { background: var(--success-bg); color: var(--success); }

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary);
  color: #000;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  z-index: 2000;
  transition: transform 0.3s, opacity 0.3s;
}

.toast.hidden {
  transform: translateX(-50%) translateY(20px);
  opacity: 0;
  pointer-events: none;
}