:root {
  --primary: #fc5200;
  --primary-light: #ff6e40;
  --primary-dark: #d84315;
  --success: #4caf50;
  --error: #f44336;
  --warning: #ff9800;
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f5;
  --text-primary: #212121;
  --text-secondary: #666666;
  --border: #e0e0e0;
  --shadow: 0 2px 8px rgba(0,0,0,0.1);
}

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

html, body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

/* Header */
.header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: white;
  padding: 30px 20px;
  border-radius: 8px;
  margin-bottom: 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--shadow);
}

.header h1 {
  font-size: 32px;
  font-weight: 600;
}

.status-indicator {
  font-size: 14px;
  padding: 8px 16px;
  border-radius: 20px;
  background: rgba(255,255,255,0.2);
}

.status-indicator.loading {
  color: #fff;
}

.status-indicator.error {
  background: var(--error);
  color: white;
}

.status-indicator.success {
  color: #fff;
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 30px;
}

.stat-card {
  background: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: var(--shadow);
  text-align: center;
}

.stat-label {
  font-size: 13px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 10px;
  display: block;
  font-weight: 600;
}

.stat-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--primary);
}

/* Tabs */
.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 30px;
  border-bottom: 2px solid var(--border);
}

.tab-button {
  background: transparent;
  border: none;
  padding: 12px 20px;
  font-size: 16px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  position: relative;
  transition: all 0.3s ease;
}

.tab-button:hover {
  color: var(--primary);
}

.tab-button.active {
  color: var(--primary);
}

.tab-button.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary);
}

/* Tab Content */
.tab-content {
  background: white;
  padding: 30px;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.tab-content h2 {
  font-size: 24px;
  margin-bottom: 20px;
  color: var(--text-primary);
}

/* Filters */
.filters {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
}

.filter-select,
.filter-input {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 14px;
  font-family: inherit;
}

.filter-select:focus,
.filter-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(252, 82, 0, 0.1);
}

/* Activities List */
.activities-list {
  display: grid;
  gap: 16px;
}

.activity-card {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  transition: all 0.3s ease;
}

.activity-card:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(252, 82, 0, 0.15);
}

.activity-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.activity-header h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.activity-type {
  display: inline-block;
  background: var(--primary);
  color: white;
  padding: 4px 12px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
}

.activity-details {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px;
}

.detail {
  display: flex;
  flex-direction: column;
}

.detail .label {
  font-size: 12px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
  font-weight: 600;
}

.detail .value {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

/* Trends */
.trends-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 24px;
}

.trend-card {
  background: var(--bg-secondary);
  padding: 20px;
  border-radius: 8px;
}

.trend-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.trend-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.trend-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.trend-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.trend-bar {
  height: 8px;
  background: var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.trend-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary) 0%, var(--primary-light) 100%);
  border-radius: 4px;
  transition: width 0.3s ease;
}

.trend-value {
  font-size: 13px;
  color: var(--text-secondary);
}

/* Coming Soon / Placeholder */
.placeholder-text {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 20px;
}

.coming-soon {
  background: var(--bg-secondary);
  padding: 40px;
  border-radius: 8px;
  text-align: center;
  color: var(--text-secondary);
  border: 2px dashed var(--border);
}

/* Empty State */
.empty-state {
  background: white;
  padding: 60px 20px;
  border-radius: 8px;
  text-align: center;
  color: var(--text-secondary);
  box-shadow: var(--shadow);
}

/* Recommendation Card */
.recommendation-section {
  margin-bottom: 24px;
}

.recommendation-card {
  background: linear-gradient(135deg, #4CAF50 0%, #45a049 100%);
  color: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: var(--shadow);
  border-left: 4px solid #2e7d32;
}

.recommendation-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.recommendation-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  opacity: 0.9;
}

.recommendation-emoji {
  font-size: 20px;
}

.recommendation-intensity {
  font-size: 11px;
  font-weight: 700;
  padding: 4px 12px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.recommendation-intensity.easy {
  background: rgba(255, 193, 7, 0.3);
}

.recommendation-intensity.moderate {
  background: rgba(255, 255, 255, 0.2);
}

.recommendation-intensity.hard {
  background: rgba(244, 67, 54, 0.3);
}

.recommendation-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.recommendation-body h3 {
  font-size: 20px;
  font-weight: 700;
  margin: 0;
  line-height: 1.3;
}

.recommendation-reason {
  font-size: 14px;
  opacity: 0.95;
  margin: 0;
  line-height: 1.4;
}

.recommendation-detail {
  font-size: 12px;
  opacity: 0.8;
  margin: 0;
  font-style: italic;
}

.recommendation-note {
  font-size: 11px;
  opacity: 0.7;
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
}

/* Discipline Selector */
.discipline-selector {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.discipline-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border: 2px solid var(--border);
  background: white;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.3s ease;
}

.discipline-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.discipline-btn.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.discipline-emoji {
  font-size: 20px;
}

/* Run Sub-tabs */
.run-subtabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  border-bottom: 2px solid var(--border);
}

.subtab-button {
  background: transparent;
  border: none;
  padding: 12px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  position: relative;
  transition: all 0.3s ease;
}

.subtab-button:hover {
  color: var(--primary);
}

.subtab-button.active {
  color: var(--primary);
}

.subtab-button.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary);
}

/* Pace/Speed Metrics */
.pace-section {
  margin-bottom: 30px;
}

.pace-card {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: white;
  padding: 24px;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.pace-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  opacity: 0.9;
  font-weight: 600;
  margin-bottom: 16px;
  display: block;
}

.pace-metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
}

.pace-metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.metric-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  opacity: 0.8;
  font-weight: 600;
}

.metric-value {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.metric-value.trend-value {
  font-size: 20px;
}

.metric-value.trend-value.faster {
  color: #4caf50;
  text-shadow: 0 0 10px rgba(76, 175, 80, 0.3);
}

.metric-value.trend-value.slower {
  color: #ff9800;
  text-shadow: 0 0 10px rgba(255, 152, 0, 0.3);
}

.metric-value.trend-value.stable {
  opacity: 0.8;
}

.pace-chart-container {
  margin-top: 24px;
  background: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.pace-chart-container h3 {
  margin-bottom: 16px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

.pace-chart-container canvas {
  max-height: 300px;
}

/* Milestones */
.milestones-section {
  margin-bottom: 30px;
}

.milestones-section h2 {
  margin-bottom: 20px;
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
}

.milestones-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}

.milestone-card {
  background: white;
  padding: 20px;
  border-radius: 8px;
  border-left: 4px solid var(--primary);
  box-shadow: var(--shadow);
}

.milestone-card.secondary {
  border-left-color: #888;
  opacity: 0.85;
}

.milestone-header {
  margin-bottom: 12px;
}

.milestone-header h3 {
  font-size: 14px;
  text-transform: uppercase;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
  font-weight: 600;
  margin: 0;
}

.milestone-message {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.4;
}

.milestone-progress {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.progress-bar {
  height: 8px;
  background: var(--bg-secondary);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary) 0%, var(--primary-light) 100%);
  transition: width 0.3s ease;
}

.progress-text {
  font-size: 12px;
  color: var(--text-secondary);
  text-align: right;
}

/* YTD Charts */
.ytd-charts {
  display: grid;
  gap: 30px;
}

.chart-container {
  background: var(--bg-secondary);
  padding: 20px;
  border-radius: 8px;
}

.chart-container h3 {
  margin-bottom: 16px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

.chart-container canvas {
  max-height: 300px;
  margin-bottom: 20px;
}

.ytd-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
}

.ytd-stat {
  background: white;
  padding: 12px;
  border-radius: 6px;
  border-left: 4px solid var(--primary);
}

.discipline-name {
  display: block;
  font-size: 12px;
  text-transform: uppercase;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
  font-weight: 600;
  margin-bottom: 8px;
}

.stat-values {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.stat-values > div {
  flex: 1;
}

.stat-values .label {
  font-size: 11px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  display: block;
  margin-bottom: 2px;
}

.stat-values .value {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  display: block;
}

.stat-values .value.projection {
  color: var(--primary);
}

/* Responsive */
@media (max-width: 768px) {
  .header {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .header h1 {
    font-size: 24px;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .tabs {
    overflow-x: auto;
  }

  .tab-content {
    padding: 20px;
  }

  .activity-details {
    grid-template-columns: 1fr;
  }

  .trends-container {
    grid-template-columns: 1fr;
  }
}

/* Loading state */
@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading {
  animation: spin 1s linear infinite;
}