/* Custom CSS for EmoVIT Application */

:root {
    --primary-color: #4f46e5;
    --primary-dark: #3730a3;
    --secondary-color: #06b6d4;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --light-color: #f8fafc;
    --dark-color: #1e293b;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
}

/* Background Gradient */
.bg-gradient-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    min-height: 100vh;
}

/* Custom Card Styling */
.card {
    border: none;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 25px 30px -5px rgba(0, 0, 0, 0.15), 0 15px 15px -5px rgba(0, 0, 0, 0.06);
}

/* Button Styling */
.btn {
    border-radius: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border: none;
    box-shadow: 0 4px 15px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(79, 70, 229, 0.4);
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
}

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

.btn-outline-primary:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

/* Form Styling */
.form-control {
    border-radius: 10px;
    border: 2px solid #e2e8f0;
    padding: 12px 16px;
    font-size: 16px;
    transition: all 0.3s ease;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
    transform: translateY(-1px);
}

.form-control-lg {
    padding: 16px 20px;
    font-size: 18px;
}

/* Alert Styling */
.alert {
    border-radius: 12px;
    border: none;
    padding: 20px;
    font-weight: 500;
}

.alert-info {
    background: linear-gradient(135deg, #e0f2fe, #b3e5fc);
    color: #0277bd;
}

.alert-success {
    background: linear-gradient(135deg, #e8f5e8, #c8e6c9);
    color: #2e7d32;
}

.alert-danger {
    background: linear-gradient(135deg, #ffebee, #ffcdd2);
    color: #c62828;
}

/* Loading Spinner */
.spinner-border {
    width: 3rem;
    height: 3rem;
    border-width: 0.3em;
}

/* Image Preview */
#previewImage {
    max-width: 100%;
    border-radius: 10px;
    transition: transform 0.3s ease;
}

#previewImage:hover {
    transform: scale(1.02);
}

/* Upload Section */
.upload-section {
    position: relative;
}

.upload-section::before {
    content: '';
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

/* Results Section */
.emotion-result {
    text-align: center;
}

.emotion-result h4 {
    margin-bottom: 20px;
}

/* Icon Styling */
.fas, .far {
    transition: transform 0.3s ease;
}

.btn:hover .fas,
.btn:hover .far {
    transform: scale(1.1);
}

/* Card Headers */
.card-header {
    background: linear-gradient(135deg, #f8fafc, #e2e8f0) !important;
    border-bottom: 2px solid #e2e8f0;
    border-radius: 12px 12px 0 0 !important;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .card-body {
        padding: 30px 20px;
    }
    
    .display-4 {
        font-size: 2.5rem;
    }
    
    .btn-lg {
        padding: 12px 30px;
        font-size: 16px;
    }
}

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

.card {
    animation: fadeIn 0.6s ease-out;
}

/* Custom Utilities */
.rounded-4 {
    border-radius: 1.5rem !important;
}

.text-white-50 {
    color: rgba(255, 255, 255, 0.75) !important;
}

/* File Input Styling */
input[type="file"] {
    cursor: pointer;
}

input[type="file"]::-webkit-file-upload-button {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 8px;
    margin-right: 10px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

input[type="file"]::-webkit-file-upload-button:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

/* Progress Bar (for future use) */
.progress {
    height: 8px;
    border-radius: 4px;
    background-color: #e2e8f0;
}

.progress-bar {
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 4px;
}

/* Tooltip Styling */
.tooltip {
    font-size: 12px;
}

.tooltip-inner {
    background-color: var(--dark-color);
    border-radius: 6px;
}

/* Focus States for Accessibility */
.btn:focus,
.form-control:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.25);
}

/* Error Styling */
.is-invalid {
    border-color: var(--danger-color);
}

.invalid-feedback {
    color: var(--danger-color);
    font-weight: 500;
}