:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #06b6d4;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas, 'Liberation Mono', monospace;
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

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

html, body {
    height: 100%;
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container-fluid {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

header {
    background: linear-gradient(135deg, var(--primary-color) 0%, #1e40af 100%);
    color: white;
    padding: 2rem 0;
    box-shadow: var(--shadow-md);
    margin-bottom: 2rem;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: -0.025em;
}

header .subtitle {
    font-size: 1.125rem;
    opacity: 0.9;
    font-weight: 400;
}

.info-section {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.info-section p {
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

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

.info-section strong {
    color: var(--text-primary);
    font-weight: 600;
}

.filter-panel {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.filter-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.filter-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.filter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.filter-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.filter-group select,
.filter-group input[type="text"] {
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    color: var(--text-primary);
    background: var(--bg-primary);
    transition: all 0.2s ease;
}

.filter-group select:focus,
.filter-group input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.filter-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
}

.btn {
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--border-color);
}

.legend {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 1rem 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.legend-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9375rem;
}

.legend-color {
    width: 1rem;
    height: 1rem;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.legend-color.in-progress {
    background: var(--danger-color);
}

.legend-color.upcoming-confirmed {
    background: var(--success-color);
}

.legend-color.upcoming-tentative {
    background: var(--warning-color);
}

.trips-container {
    display: grid;
    gap: 1rem;
}

.trip-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: all 0.2s ease;
}

.trip-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.trip-header {
    padding: 1.25rem 1.5rem;
    cursor: pointer;
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 1.5rem;
    align-items: center;
    border-left: 4px solid transparent;
    transition: all 0.2s ease;
}

.trip-header:hover {
    background: var(--bg-secondary);
}

.trip-header.status-in-progress {
    border-left-color: var(--danger-color);
    background: rgba(239, 68, 68, 0.05);
}

.trip-header.status-upcoming-confirmed {
    border-left-color: var(--success-color);
    background: rgba(16, 185, 129, 0.05);
}

.trip-header.status-upcoming-tentative {
    border-left-color: var(--warning-color);
    background: rgba(245, 158, 11, 0.05);
}

.trip-chevron {
    color: var(--text-muted);
    transition: transform 0.2s ease;
    font-size: 1.25rem;
}

.trip-chevron.expanded {
    transform: rotate(90deg);
}

.trip-main {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.trip-route {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.trip-carrier {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.trip-number {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.trip-stations {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

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

.station-name {
    font-weight: 500;
    color: var(--text-primary);
}

.station-code {
    font-size: 0.8125rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.route-arrow {
    color: var(--text-muted);
    font-size: 1.25rem;
}

.trip-times {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.time-block {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.time-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.time-value {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-primary);
}

.time-tz {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.trip-meta {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.meta-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.meta-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.meta-value {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.trip-details {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    display: none;
}

.trip-details.show {
    display: block;
}

.details-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.detail-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.detail-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.detail-value {
    color: var(--text-primary);
    font-size: 0.9375rem;
}

.detail-value a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.detail-value a:hover {
    text-decoration: underline;
}

.map-container {
    margin-top: 1rem;
}

.map-canvas {
    width: 100%;
    height: 400px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.loading-spinner {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    border: 2px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

.skeleton {
    background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--border-color) 50%, var(--bg-tertiary) 75%);
    background-size: 200% 100%;
    animation: loading 1.5s ease-in-out infinite;
    border-radius: var(--radius-md);
}

@keyframes loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

@media (max-width: 768px) {
    header h1 {
        font-size: 1.875rem;
    }
    
    .filter-grid {
        grid-template-columns: 1fr;
    }
    
    .trip-main {
        grid-template-columns: 1fr;
    }
    
    .trip-times {
        grid-template-columns: 1fr;
    }
    
    .trip-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .details-grid {
        grid-template-columns: 1fr;
    }
}

.page-size-selector {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.page-size-selector label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.page-size-selector select {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    color: var(--text-primary);
    background: var(--bg-primary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.page-size-selector select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.pagination-controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 2rem 0;
    margin-top: 2rem;
}

.pagination-info {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    margin: 0;
}

.btn-load-more {
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
}

@media (max-width: 480px) {
    .container-fluid {
        padding: 0 1rem;
    }
    
    header {
        padding: 1.5rem 0;
    }
    
    header h1 {
        font-size: 1.5rem;
    }
    
    .filter-panel,
    .info-section,
    .legend {
        padding: 1rem;
    }
    
    .trip-header {
        padding: 1rem;
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .trip-stations {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .page-size-selector {
        width: 100%;
        justify-content: space-between;
    }
}