:root {
  --bg-main: #f8f9fc;
  --sidebar-bg: rgba(255, 255, 255, 0.97);
  --accent: #111b21;
  --accent-secondary: #3b82f6;
  --text-main: #1f2937;
  --text-dim: #6b7280;
  --danger: #ef4444;
  --success: #10b981;
  --warning: #f59e0b;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-display: "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif;
}

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

body {
  font-family: var(--font);
  background: var(--bg-main);
  color: var(--text-main);
  display: flex;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

#sidebar {
  width: 350px;
  flex-shrink: 0;
  background: var(--sidebar-bg);
  border-right: 1px solid rgba(0, 0, 0, 0.05);
  display: flex;
  flex-direction: column;
  padding: 2rem;
  z-index: 1000;
  box-shadow: 10px 0 30px rgba(0, 0, 0, 0.05);
  overflow-y: auto;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: 3px;
  color: var(--accent);
}

.logo span {
  color: var(--accent-secondary);
}

.tagline {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 5px;
}

/* Engine status pill */
.status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.72rem;
  background: #f3f4f6;
  color: var(--text-dim);
}

.status .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--warning);
}

.status-loading .dot {
  animation: pulse 1.2s ease-in-out infinite;
}

.status-ready .dot {
  background: var(--success);
}

.status-error {
  color: var(--danger);
}

.status-error .dot {
  background: var(--danger);
}

@keyframes pulse {
  50% { opacity: 0.3; }
}

.controls {
  margin-top: 2rem;
  flex-grow: 1;
}

.mode-selector {
  display: flex;
  background: #eee;
  padding: 4px;
  border-radius: 8px;
  margin-bottom: 1.5rem;
}

.mode-btn {
  flex: 1;
  padding: 8px;
  border: none;
  background: transparent;
  border-radius: 6px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s;
  font-weight: 600;
  color: var(--text-dim);
}

.mode-btn.active {
  background: white;
  color: var(--accent);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.control-group {
  margin-bottom: 1.5rem;
}

label {
  display: block;
  font-size: 0.9rem;
  margin-bottom: 10px;
  color: var(--text-dim);
}

label span {
  color: var(--accent-secondary);
  font-weight: 600;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent-secondary);
}

.info-panel {
  background: rgba(0, 0, 0, 0.02);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
  border: 1px solid rgba(0, 0, 0, 0.05);
}

.info-item {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 10px;
  font-size: 0.9rem;
}

.info-item:last-child {
  margin-bottom: 0;
}

.info-item .label {
  color: var(--text-dim);
}

.info-item span:last-child {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--accent-secondary);
  text-align: right;
}

button {
  font-family: var(--font-display);
  letter-spacing: 1px;
}

.primary-btn {
  width: 100%;
  padding: 1rem;
  background: var(--accent-secondary);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
}

.primary-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  background: #2563eb;
}

.primary-btn:disabled {
  background: #cbd5e1;
  cursor: not-allowed;
  transform: none;
}

.btn-row {
  display: flex;
  gap: 10px;
  margin-top: 10px;
}

.secondary-btn,
.download-btn {
  flex: 1;
  padding: 0.8rem;
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.secondary-btn {
  background: transparent;
  color: var(--text-dim);
  border: 1px solid #ddd;
}

.secondary-btn:hover {
  background: #f1f1f1;
  color: var(--accent);
}

.download-btn {
  background: var(--success);
  color: #fff;
  border: none;
}

.download-btn:hover {
  background: #0ea371;
}

[hidden] {
  display: none !important;
}

.hint {
  font-size: 0.8rem;
  color: var(--text-dim);
  text-align: center;
  margin-top: 15px;
  min-height: 1.2em;
}

.hint.error {
  color: var(--danger);
  font-weight: 600;
}

.about {
  margin-top: 1.5rem;
  font-size: 0.8rem;
  color: var(--text-dim);
  line-height: 1.5;
}

.about summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--accent);
}

.about p {
  margin-top: 8px;
}

#map {
  flex: 1;
  height: 100%;
  background: #fff;
}

.leaflet-container {
  background: #fff !important;
  font-family: var(--font);
}

/* Numbered waypoint markers */
.numbered-marker {
  background: var(--accent);
  color: white;
  width: 26px !important;
  height: 26px !important;
  border-radius: 50% !important;
  border: 2px solid white !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  font-size: 11px !important;
  font-weight: bold !important;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2) !important;
}

.numbered-marker.start {
  background: #3b82f6 !important;
}

.numbered-marker.end {
  background: #ef4444 !important;
}

.numbered-marker.waypoint {
  background: #111b21 !important;
}

/* Phones: map on top, controls below */
@media (max-width: 760px) {
  body {
    flex-direction: column-reverse;
  }

  #sidebar {
    width: 100%;
    height: 46%;
    padding: 1rem 1.25rem 1.25rem;
    border-right: none;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
    box-shadow: 0 -8px 24px rgba(0, 0, 0, 0.06);
  }

  #map {
    height: 54%;
    flex: none;
  }

  .logo {
    font-size: 1.2rem;
  }

  .tagline {
    display: none;
  }

  .controls {
    margin-top: 0.75rem;
  }

  .mode-selector,
  .control-group,
  .info-panel {
    margin-bottom: 0.75rem;
  }

  .info-panel {
    padding: 0.75rem 1rem;
  }

  .info-item {
    margin-bottom: 4px;
  }
}