/* Custom CSS for Air Quality Index Predictor */

/* Global Styles */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    margin: 0;
}

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

/* Header Styles */
header {
    background: linear-gradient(135deg, #2c3e50 0%, #3498db 100%) !important;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.display-4 {
    font-weight: 600;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

/* Card Styles */
.card {
    border: none;
    border-radius: 15px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.card-header {
    border-radius: 15px 15px 0 0 !important;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%) !important;
    border-bottom: 2px solid #dee2e6;
}

.card-title {
    color: #2c3e50;
    font-weight: 600;
}

/* Form Styles */
.form-label {
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.form-control {
    border: 2px solid #e9ecef;
    border-radius: 10px;
    padding: 0.75rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    background: rgba(255, 255, 255, 0.9);
}

.form-control:focus {
    border-color: #3498db;
    box-shadow: 0 0 0 0.2rem rgba(52, 152, 219, 0.25);
    background: rgba(255, 255, 255, 1);
}

/* Button Styles */
.btn {
    border-radius: 10px;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #2980b9 0%, #1f5f8b 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
}

.btn-outline-secondary {
    color: #6c757d;
    border: 2px solid #6c757d;
    background: transparent;
}

.btn-outline-secondary:hover {
    background: #6c757d;
    transform: translateY(-2px);
}

.btn-warning {
    background: linear-gradient(135deg, #f39c12 0%, #e67e22 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(243, 156, 18, 0.3);
}

.btn-warning:hover {
    background: linear-gradient(135deg, #e67e22 0%, #d35400 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(243, 156, 18, 0.4);
}

/* AQI Display Styles */
.aqi-display {
    position: relative;
}

.aqi-value {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.aqi-label {
    font-size: 1.2rem;
    font-weight: 600;
    color: #6c757d;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.aqi-category {
    margin: 1rem 0;
}

.aqi-category .badge {
    border-radius: 25px;
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 0.75rem 1.5rem;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.aqi-description {
    font-size: 1.1rem;
    color: #6c757d;
    font-style: italic;
}

/* AQI Category Colors */
.aqi-good {
    background-color: #00E400 !important;
    color: #000 !important;
}

.aqi-moderate {
    background-color: #FFFF00 !important;
    color: #000 !important;
}

.aqi-unhealthy-sensitive {
    background-color: #FF7E00 !important;
    color: #fff !important;
}

.aqi-unhealthy {
    background-color: #FF0000 !important;
    color: #fff !important;
}

.aqi-very-unhealthy {
    background-color: #8F3F97 !important;
    color: #fff !important;
}

.aqi-hazardous {
    background-color: #7E0023 !important;
    color: #fff !important;
}

/* Loading Animation */
.spinner-border {
    width: 3rem;
    height: 3rem;
}

/* Chart Container */
#pollutantChart {
    max-height: 300px;
}

/* Sample Data Cards */
.sample-card {
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.sample-card:hover {
    border-color: #3498db;
    transform: scale(1.02);
}

.sample-card .card-body {
    padding: 1rem;
}

.sample-card .card-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.sample-values {
    font-size: 0.85rem;
    color: #6c757d;
}

/* Info Icons */
.fa-info-circle {
    cursor: help;
    opacity: 0.7;
    transition: opacity 0.3s ease;
}

.fa-info-circle:hover {
    opacity: 1;
}

/* Modal Styles */
.modal-content {
    border-radius: 15px;
    border: none;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.modal-header {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 15px 15px 0 0;
    border-bottom: 2px solid #dee2e6;
}

/* Footer */
footer {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%) !important;
    margin-top: auto;
}

/* Responsive Design */
@media (max-width: 768px) {
    .display-4 {
        font-size: 2rem;
    }
    
    .aqi-value {
        font-size: 3rem;
    }
    
    .card {
        margin-bottom: 1rem;
    }
    
    .btn {
        width: 100%;
        margin-bottom: 0.5rem;
    }
    
    .d-md-flex .btn {
        width: auto;
    }
}

@media (max-width: 576px) {
    .container-fluid {
        padding: 0 10px;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .aqi-value {
        font-size: 2.5rem;
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.slide-up {
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Error and Success States */
.alert {
    border-radius: 10px;
    border: none;
    font-weight: 500;
}

.alert-danger {
    background: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%);
    color: white;
}

.alert-success {
    background: linear-gradient(135deg, #2ecc71 0%, #27ae60 100%);
    color: white;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #2980b9 0%, #1f5f8b 100%);
}