:root {
  --bg: #0f172a;
  --bg2: #1e293b;
  --card: #1e293b;
  --card2: #263348;
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --accent: #06b6d4;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --border: #334155;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --radius: 14px;
  --radius-sm: 8px;
}
[data-theme="light"] {
  --bg: #f1f5f9;
  --bg2: #e2e8f0;
  --card: #ffffff;
  --card2: #f8fafc;
  --text: #0f172a;
  --text-muted: #64748b;
  --border: #cbd5e1;
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background 0.3s, color 0.3s;
}

.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15,23,42,0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 0 32px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
[data-theme="light"] .navbar { background: rgba(241,245,249,0.9); }
.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.3px;
}
.navbar-brand svg { width:28px; height:28px; }
.brand-name { color: var(--text); }
.brand-pro { color: var(--primary); }
.navbar-actions { display:flex; gap:10px; align-items:center; }
.btn-icon {
  background: var(--card2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 6px;
}
.btn-icon:hover { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-add { font-size:0.82rem; white-space:nowrap; }

.page-container { max-width: 1280px; margin: 0 auto; padding: 32px 24px; }
.hidden { display: none !important; }

#editorLayout {
  display: none;
  grid-template-rows: auto auto 1fr auto;
  gap: 20px;
}
#editorLayout.visible {
  display: grid;
}

.upload-hero { text-align: center; padding: 60px 20px; }
.upload-title { font-size: 1.8rem; font-weight: 800; margin-bottom: 8px; }
.upload-subtitle { color: var(--text-muted); font-size: 1rem; margin-bottom: 32px; }

.drop-zone {
  background: var(--card);
  border: 2px dashed var(--primary);
  border-radius: var(--radius);
  padding: 52px 24px;
  text-align: center;
  cursor: pointer;
  transition: all 0.25s;
  max-width: 480px;
  margin: 0 auto;
}
.drop-zone:hover, .drop-zone.active {
  border-color: var(--accent);
  background: var(--card2);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(59,130,246,0.15);
}
.drop-zone-icon { font-size: 3rem; margin-bottom: 12px; color: var(--primary); }
.drop-zone-title { font-size: 1.15rem; font-weight: 600; margin-bottom: 6px; }
.drop-zone-sub { color: var(--text-muted); font-size: 0.88rem; margin-bottom: 16px; }
.format-badges { display: flex; gap: 8px; justify-content: center; }
.fmt-badge {
  display: inline-block;
  border-radius: 20px;
  padding: 3px 12px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.fmt-badge.fit { background: var(--success); color: #fff; }
.fmt-badge.gpx { background: var(--accent); color: #fff; }

.top-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.activity-chips { display: flex; flex-wrap: wrap; gap: 8px; flex: 1; }

.preview-card {
  background: var(--card2);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 16px;
  font-size: 0.82rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  transition: all 0.2s;
}
.preview-card.active { background: var(--primary); border-color: var(--primary); color: #fff; }
.preview-card:hover:not(.active) { border-color: var(--primary); color: var(--primary); }
.preview-name { white-space: nowrap; }
.preview-meta { color: var(--text-muted); font-size: 0.75rem; white-space: nowrap; }
.preview-card.active .preview-meta { color: rgba(255,255,255,0.75); }

.stats-section { margin-top: 4px; }
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
}
.stat-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
  transition: transform 0.2s, box-shadow 0.2s;
}
.stat-item:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.stat-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 4px;
  font-weight: 600;
}
.stat-value { font-size: 1.5rem; font-weight: 800; color: var(--primary); }

.viz-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
@media (max-width: 900px) {
  .viz-grid { grid-template-columns: 1fr; }
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px 0;
}
.chart-header { padding-bottom: 12px; }
.card-label {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  display: flex;
  align-items: center;
  gap: 6px;
}
.card-label svg { width: 14px; height: 14px; }

.map-container {
  height: 400px;
  width: 100%;
  border: none;
}
#map { height: 400px; width: 100%; }

.chart-wrapper { padding: 8px 16px 16px; height: 280px; }

.metric-tabs { display: flex; gap: 6px; flex-wrap: wrap; }
.metric-tabs button {
  padding: 4px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--card2);
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}
.metric-tabs button.active { background: var(--primary); border-color: var(--primary); color: #fff; }
.metric-tabs button:hover:not(.active) { border-color: var(--primary); color: var(--primary); }

.controls-card { padding: 0; }
.controls-card .card-header { padding: 18px 22px 0; }
.controls-body {
  display: flex;
  align-items: flex-end;
  gap: 24px;
  padding: 16px 22px 22px;
  flex-wrap: wrap;
}
.slider-control {
  flex: 2;
  min-width: 240px;
}
.slider-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}
.slider-label { font-size: 0.82rem; font-weight: 600; color: var(--text-muted); }
.slider-value { font-size: 1.1rem; font-weight: 700; color: var(--primary); }

.power-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--border);
  outline: none;
  cursor: pointer;
}
.power-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  border: 3px solid var(--card);
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}
.power-slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  border: 3px solid var(--card);
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}
.power-slider:disabled { opacity: 0.4; cursor: not-allowed; }

.slider-ticks { display: flex; justify-content: space-between; font-size: 0.7rem; color: var(--text-muted); margin-top: 4px; }

.export-col {
  flex: 1;
  min-width: 180px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.export-note { font-size: 0.75rem; color: var(--text-muted); font-style: italic; }

.btn {
  padding: 11px 22px;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 700;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: inherit;
  justify-content: center;
}
.btn-export { background: var(--primary); color: #fff; }
.btn-export:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 4px 16px rgba(59,130,246,0.35); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none !important; box-shadow: none !important; }

.laps-section { margin-top: 16px; }
.laps-section h4 { font-size: 0.85rem; font-weight: 700; margin-bottom: 8px; color: var(--text-muted); }
.laps-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
}
.laps-table th {
  text-align: left;
  padding: 6px 8px;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.laps-table td { padding: 6px 8px; border-bottom: 1px solid var(--border); }

.device-info { margin-top: 12px; font-size: 0.8rem; color: var(--text-muted); }

.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15,23,42,0.85);
  backdrop-filter: blur(8px);
  display: none;
  place-items: center;
  z-index: 1000;
}
.loader-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loader-text { color: var(--text-muted); margin-top: 12px; font-size: 0.9rem; }

.toast {
  position: fixed;
  bottom: 28px;
  right: 28px;
  background: var(--success);
  color: #fff;
  padding: 14px 22px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.9rem;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.3s;
  z-index: 999;
  pointer-events: none;
}
.toast.show { opacity: 1; transform: translateY(0); }

@media (max-width: 640px) {
  .page-container { padding: 16px 12px; }
  .navbar { padding: 0 16px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .controls-body { flex-direction: column; align-items: stretch; }
}