/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: #f9fafb;
    color: #111827;
    line-height: 1.6;
}

.app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header Styles */
.header {
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.app-title {
    font-size: 1.875rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.app-title i {
    font-size: 2rem;
}

.refresh-btn {
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s ease;
}

.refresh-btn:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-1px);
}

.refresh-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.refresh-btn.loading i {
    animation: spin 1s linear infinite;
}

.last-refresh {
    max-width: 1200px;
    margin: 0.5rem auto 0;
    padding: 0 1rem;
    font-size: 0.875rem;
    opacity: 0.8;
}

/* Statistics Panel */
.stats-panel {
    background: white;
    margin: 1rem;
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    padding: 1.5rem;
}

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

.stat-card {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 0.5rem;
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: all 0.2s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px 0 rgba(0, 0, 0, 0.1);
}

.stat-icon {
    width: 3rem;
    height: 3rem;
    background: #3b82f6;
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
}

.stat-content {
    flex: 1;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.875rem;
    color: #6b7280;
    font-weight: 500;
}

/* Filters Panel */
.filters-panel {
    background: white;
    margin: 0 1rem 1rem;
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    padding: 1.5rem;
}

.filters-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    align-items: end;
}

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

.filter-label {
    font-weight: 600;
    color: #374151;
    font-size: 0.875rem;
}

.slider {
    width: 100%;
    height: 0.5rem;
    border-radius: 0.25rem;
    background: #e5e7eb;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.slider::-webkit-slider-thumb { 
    -webkit-appearance: none;
    appearance: none;
    width: 1.25rem;
    height: 1.25rem;
    border-radius: 50%;
    background: #3b82f6;
    cursor: pointer;
    box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.1);
}

.slider::-moz-range-thumb {
    width: 1.25rem;
    height: 1.25rem;
    border-radius: 50%;
    background: #3b82f6;
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.1);
}

.select, .search-input {
    padding: 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    background: white;
    transition: border-color 0.2s ease;
}

.select:focus, .search-input:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.reset-btn {
    background: #6b7280;
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s ease;
    height: fit-content;
}

.reset-btn:hover {
    background: #4b5563;
    transform: translateY(-1px);
}

/* Main Content */
.main-content {
    flex: 1;
    margin: 0 1rem 1rem;
    background: white;
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

/* Loading State */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    text-align: center;
}

.spinner {
    width: 3rem;
    height: 3rem;
    border: 4px solid #e5e7eb;
    border-top: 4px solid #3b82f6;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

/* Error State */
.error-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    text-align: center;
}

.error-icon {
    font-size: 4rem;
    color: #ef4444;
    margin-bottom: 1rem;
}

.error-state h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: 0.5rem;
}

.error-state p {
    color: #6b7280;
    margin-bottom: 2rem;
}

.retry-btn {
    background: #ef4444;
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s ease;
}

.retry-btn:hover {
    background: #dc2626;
    transform: translateY(-1px);
}

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    text-align: center;
}

.empty-icon {
    font-size: 4rem;
    color: #9ca3af;
    margin-bottom: 1rem;
}

.empty-state h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: 0.5rem;
}

.empty-state p {
    color: #6b7280;
    margin-bottom: 2rem;
}

/* Data Table */
.data-container {
    padding: 1.5rem;
}

.table-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #e5e7eb;
}

.table-header h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: #1f2937;
}

.record-count {
    font-size: 0.875rem;
    color: #6b7280;
    font-weight: 500;
}

.table-wrapper {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.data-table th {
    background: #f8fafc;
    color: #374151;
    font-weight: 600;
    text-align: left;
    padding: 1rem;
    border-bottom: 1px solid #e5e7eb;
    white-space: nowrap;
}

.data-table td {
    padding: 1rem;
    border-bottom: 1px solid #f3f4f6;
    vertical-align: middle;
}

.data-table tbody tr {
    transition: background-color 0.2s ease;
}

.data-table tbody tr:hover {
    background: #f8fafc;
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

/* Air Quality Status Indicators */
.status-indicator {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.status-good {
    background: #dcfce7;
    color: #166534;
}

.status-moderate {
    background: #fef3c7;
    color: #92400e;
}

.status-unhealthy-sensitive {
    background: #fed7aa;
    color: #9a3412;
}

.status-unhealthy {
    background: #fecaca;
    color: #991b1b;
}

.status-dot {
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    display: inline-block;
}

.status-good .status-dot {
    background: #10b981;
}

.status-moderate .status-dot {
    background: #f59e0b;
}

.status-unhealthy-sensitive .status-dot {
    background: #f97316;
}

.status-unhealthy .status-dot {
    background: #ef4444;
}

/* PM2.5 Value Styling */
.pm25-value {
    font-family: 'Courier New', monospace;
    font-weight: 700;
    font-size: 1rem;
}

/* Action Buttons */
.action-btn {
    background: #3b82f6;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.action-btn:hover {
    background: #2563eb;
    transform: translateY(-1px);
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: white;
    border-radius: 0.75rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid #e5e7eb;
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: #1f2937;
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: #6b7280;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 0.375rem;
    transition: all 0.2s ease;
}

.close-btn:hover {
    background: #f3f4f6;
    color: #374151;
}

.modal-content {
    padding: 1.5rem;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 1100;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toast {
    background: white;
    border: 1px solid #e5e7eb;
    border-radius: 0.5rem;
    padding: 1rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-width: 300px;
    transform: translateX(100%);
    transition: transform 0.3s ease;
}

.toast.show {
    transform: translateX(0);
}

.toast.success {
    border-left: 4px solid #10b981;
}

.toast.error {
    border-left: 4px solid #ef4444;
}

.toast-icon {
    font-size: 1.25rem;
}

.toast.success .toast-icon {
    color: #10b981;
}

.toast.error .toast-icon {
    color: #ef4444;
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 0.25rem;
}

.toast-message {
    font-size: 0.875rem;
    color: #6b7280;
}

/* Animations */
@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .app-title {
        font-size: 1.5rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .filters-content {
        grid-template-columns: 1fr;
    }

    .table-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .data-table {
        font-size: 0.75rem;
    }

    .data-table th,
    .data-table td {
        padding: 0.75rem 0.5rem;
    }

    .modal {
        width: 95%;
        margin: 1rem;
    }

    .toast-container {
        left: 1rem;
        right: 1rem;
    }

    .toast {
        min-width: auto;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 0.75rem 0;
    }

    .header-content {
        padding: 0 0.75rem;
    }

    .stats-panel,
    .filters-panel,
    .main-content {
        margin: 0.5rem;
    }

    .data-table th,
    .data-table td {
        padding: 0.5rem 0.25rem;
    }

    .stat-card {
        padding: 0.75rem;
    }

    .stat-icon {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1rem;
    }

    .stat-value {
        font-size: 1.25rem;
    }
}

/* Accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
button:focus,
input:focus,
select:focus {
    outline: 2px solid #3b82f6;
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .status-good {
        background: #000;
        color: #fff;
    }

    .status-moderate {
        background: #000;
        color: #ffff00;
    }

    .status-unhealthy-sensitive {
        background: #000;
        color: #ff8800;
    }

    .status-unhealthy {
        background: #000;
        color: #ff0000;
    }
}