:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --surface-2: #243044;
  --border: #334155;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --accent-dim: #0ea5e9;
  --success: #4ade80;
  --warn: #fbbf24;
  --glass: rgba(56, 189, 248, 0.15);
  --font: "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-header {
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.app-header h1 {
  font-size: 1.25rem;
  font-weight: 600;
}

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

.app-layout {
  flex: 1;
  display: grid;
  grid-template-columns: 220px 1fr 320px;
  min-height: 0;
  height: calc(100vh - 56px);
}

.toolbar {
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 12px;
  overflow-y: auto;
}

.tool-group {
  margin-bottom: 16px;
}

.tool-group h3 {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-bottom: 8px;
}

.tool-btn {
  display: block;
  width: 100%;
  padding: 8px 10px;
  margin-bottom: 4px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface-2);
  color: var(--text);
  font-size: 0.85rem;
  cursor: pointer;
  text-align: left;
  transition: background 0.15s, border-color 0.15s;
}

.tool-btn:hover {
  border-color: var(--accent);
}

.tool-btn.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: #fff;
}

.tool-btn.primary {
  background: linear-gradient(135deg, #0284c7, #0369a1);
  border-color: #0ea5e9;
}

.dims-panel label {
  display: block;
  font-size: 0.8rem;
  margin-bottom: 10px;
  color: var(--muted);
}

.dims-panel input[type="number"],
.dims-panel select {
  width: 100%;
  margin-top: 4px;
  padding: 6px 8px;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}

.dim-input-row {
  display: grid;
  grid-template-columns: 1fr 100px;
  gap: 6px;
}

.dim-hint {
  font-size: 0.75rem;
  color: var(--accent);
  margin-top: 4px;
}

#scheme-select {
  width: 100%;
  min-height: 120px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.75rem;
}

.workspace {
  position: relative;
  background: #0a0e14;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.view-container {
  flex: 1;
  position: relative;
  min-height: 200px;
}

.view-container[hidden] {
  display: none !important;
}

.workspace.split-view {
  flex-direction: row;
}

.workspace.split-view .view-container {
  flex: 1;
  border-right: 1px solid var(--border);
}

.workspace.split-view .view-container:last-child {
  border-right: none;
}

#canvas-2d {
  width: 100%;
  height: 100%;
  display: block;
  cursor: crosshair;
}

#container-3d {
  width: 100%;
  height: 100%;
}

.canvas-overlay {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.75rem;
  color: var(--muted);
  background: rgba(0, 0, 0, 0.5);
  padding: 6px 12px;
  border-radius: 20px;
  pointer-events: none;
}

.results-panel {
  background: var(--surface);
  border-left: 1px solid var(--border);
  padding: 12px;
  overflow-y: auto;
}

.results-panel h3 {
  font-size: 0.85rem;
  margin-bottom: 10px;
}

.results-content {
  font-size: 0.8rem;
  line-height: 1.5;
}

.results-content .placeholder {
  color: var(--muted);
}

.scheme-card {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  margin-bottom: 8px;
  cursor: pointer;
}

.scheme-card:hover,
.scheme-card.selected {
  border-color: var(--accent);
}

.scheme-card h4 {
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 6px;
}

.scheme-card ul {
  margin-left: 16px;
  color: var(--muted);
}

.glass-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.75rem;
  margin-top: 8px;
}

.glass-table th,
.glass-table td {
  border: 1px solid var(--border);
  padding: 6px 8px;
  text-align: left;
}

.glass-table th {
  background: var(--surface-2);
  color: var(--accent);
}

.glass-table tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.03);
}

.summary-box {
  background: var(--glass);
  border: 1px solid var(--accent-dim);
  border-radius: 6px;
  padding: 10px;
  margin-bottom: 12px;
}

.summary-box strong {
  color: var(--success);
}

@media (max-width: 1100px) {
  .app-layout {
    grid-template-columns: 200px 1fr;
  }
  .results-panel {
    position: fixed;
    right: 0;
    top: 56px;
    width: 300px;
    height: calc(100vh - 56px);
    z-index: 10;
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.4);
  }
}