/* ---------------------------------------------------------------------------
   D²RO / SW-DGO Web Simulator Stylesheet (Grayscale / Slate Palette)
   --------------------------------------------------------------------------- */

:root {
  --bg-dark: #141416;
  --bg-surface: #1c1c1f;
  --bg-card: #27272a;
  --bg-card-hover: #3f3f46;
  --border-color: #3f3f46;
  --text-main: #f4f4f5;
  --text-muted: #a1a1aa;
  
  --primary: #52525b;
  --primary-hover: #71717a;
  --accent-gray-light: #e4e4e7;
  --accent-gray-mid: #a1a1aa;
  --accent-gray-dark: #3f3f46;

  --font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
  --font-mono: 'Consolas', 'Fira Code', 'Monaco', monospace;
}

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

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-family);
  line-height: 1.5;
  padding: 16px;
  min-height: 100vh;
}

.app-container {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Header */
.app-header {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.header-title h1 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-title p {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.header-badges {
  display: flex;
  gap: 8px;
  align-items: center;
}

.badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-wasm {
  background: rgba(255, 255, 255, 0.06);
  color: var(--accent-gray-light);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.badge-status {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-main);
  border: 1px solid rgba(255, 255, 255, 0.15);
  display: flex;
  align-items: center;
  gap: 6px;
}

.badge-status .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-gray-light);
  box-shadow: 0 0 6px var(--accent-gray-light);
}

/* Navigation Tabs */
.tabs-container {
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 14px 16px;
}

.tab-group {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.tab-group-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  min-width: 110px;
}

.tab-buttons {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.tab-btn {
  background: var(--bg-card);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-main);
  border-color: #52525b;
}

.tab-btn.active {
  background: var(--primary);
  color: #ffffff;
  border-color: #71717a;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

.tab-btn.env-btn.active {
  background: #3f3f46;
  border-color: #71717a;
  color: #ffffff;
}

.tab-btn.ablation-btn.active {
  background: #52525b;
  border-color: #71717a;
  color: #ffffff;
}

.scenario-desc-banner {
  background: var(--bg-card);
  border-left: 3px solid var(--accent-gray-light);
  padding: 8px 12px;
  border-radius: 4px;
  font-size: 0.88rem;
  color: var(--text-main);
  font-weight: 500;
}

/* Simulation Viewport Card */
.viewport-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.canvas-wrapper {
  position: relative;
  width: 100%;
  min-height: 540px;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #101012;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  overflow: auto;
  padding: 10px;
}

canvas#simCanvas {
  display: block;
  max-width: 100%;
  height: auto;
  cursor: crosshair;
  background: #161619;
  border-radius: 6px;
}

/* Loading Overlay */
.loading-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(20, 20, 23, 0.92);
  backdrop-filter: blur(4px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 16px;
  z-index: 10;
  transition: opacity 0.3s ease;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid rgba(255, 255, 255, 0.1);
  border-top-color: var(--accent-gray-light);
  border-radius: 50%;
  animation: spin 1s infinite linear;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-text {
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent-gray-light);
}

.loading-subtext {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* Controls Bar */
.controls-bar {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding-top: 4px;
}

.btn-group {
  display: flex;
  gap: 8px;
  align-items: center;
}

.btn {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.btn-primary {
  background: var(--primary);
  color: #ffffff;
  border-color: #71717a;
}

.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: #52525b;
}

.slider-group {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
}

.slider-group input[type="range"] {
  accent-color: var(--accent-gray-light);
  cursor: pointer;
}

/* Telemetry Dashboard Grid */
.telemetry-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  width: 100%;
}

.telemetry-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.telemetry-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.telemetry-value {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
}

.telemetry-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Legend Bar */
.legend-bar {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.legend-color {
  width: 12px;
  height: 12px;
  border-radius: 3px;
}

/* Footer */
.app-footer {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  padding: 12px 0;
  border-top: 1px solid var(--border-color);
  margin-top: 8px;
}

.app-footer a {
  color: var(--accent-gray-light);
  text-decoration: underline;
}

.app-footer a:hover {
  color: #ffffff;
}

@media (max-width: 768px) {
  .app-header {
    flex-direction: column;
    align-items: flex-start;
  }
  .controls-bar {
    flex-direction: column;
    align-items: stretch;
  }
  .btn-group {
    width: 100%;
    justify-content: space-between;
  }
}