/* Custom CSS for Exam Schedule System */

/* Global Styles */
:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --warning-gradient: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    --danger-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    --shadow-light: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 5px 15px rgba(0, 0, 0, 0.15);
    --shadow-heavy: 0 10px 30px rgba(0, 0, 0, 0.2);
    --border-radius: 15px;
    --border-radius-sm: 8px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Sarabun', sans-serif;
    line-height: 1.6;
}

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

.slide-up {
    animation: slideUp 0.6s ease-out;
}

.bounce-in {
    animation: bounceIn 0.8s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.3);
    }
    50% {
        opacity: 1;
        transform: scale(1.05);
    }
    70% {
        transform: scale(0.9);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

/* Button Enhancements */
.btn-gradient-primary {
    background: var(--primary-gradient);
    border: none;
    color: white;
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.btn-gradient-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    color: white;
}

.btn-gradient-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.btn-gradient-primary:hover::before {
    left: 100%;
}

.btn-gradient-success {
    background: var(--success-gradient);
    border: none;
    color: white;
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
}

.btn-gradient-success:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    color: white;
}

.btn-gradient-warning {
    background: var(--warning-gradient);
    border: none;
    color: white;
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
}

.btn-gradient-warning:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    color: white;
}

.btn-gradient-danger {
    background: var(--danger-gradient);
    border: none;
    color: white;
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
}

.btn-gradient-danger:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    color: white;
}

/* Card Enhancements */
.card-gradient {
    background: white;
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.card-gradient::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
}

.card-gradient:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.card-stats {
    background: white;
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.card-stats:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.card-stats .card-body {
    padding: 2rem;
}

.stats-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    margin-bottom: 1rem;
}

.stats-icon.primary {
    background: var(--primary-gradient);
}

.stats-icon.success {
    background: var(--success-gradient);
}

.stats-icon.warning {
    background: var(--warning-gradient);
}

.stats-icon.danger {
    background: var(--danger-gradient);
}

/* Form Enhancements */
.form-control-modern {
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius-sm);
    padding: 0.75rem 1rem;
    transition: var(--transition);
    background: white;
}

.form-control-modern:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
    background: white;
}

.form-floating-modern {
    position: relative;
}

.form-floating-modern .form-control {
    height: calc(3.5rem + 2px);
    padding: 1rem 0.75rem;
}

.form-floating-modern label {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    padding: 1rem 0.75rem;
    pointer-events: none;
    border: 1px solid transparent;
    transform-origin: 0 0;
    transition: opacity 0.1s ease-in-out, transform 0.1s ease-in-out;
}

/* Upload Area Enhancements */
.upload-area {
    border: 3px dashed #dee2e6;
    border-radius: var(--border-radius);
    padding: 3rem;
    text-align: center;
    transition: var(--transition);
    background: #f8f9fa;
    position: relative;
    overflow: hidden;
}

.upload-area:hover {
    border-color: #667eea;
    background: #f0f4ff;
}

.upload-area.dragover {
    border-color: #667eea;
    background: var(--primary-gradient);
    color: white;
    transform: scale(1.02);
}

.upload-area.dragover * {
    color: white !important;
}

.upload-icon {
    font-size: 3rem;
    color: #6c757d;
    margin-bottom: 1rem;
    transition: var(--transition);
}

.upload-area:hover .upload-icon {
    color: #667eea;
    transform: scale(1.1);
}

.upload-area.dragover .upload-icon {
    color: white;
    transform: scale(1.2);
}

/* File Item Enhancements */
.file-item-modern {
    background: white;
    border: 1px solid #e9ecef;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.file-item-modern::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary-gradient);
    transform: scaleY(0);
    transition: transform 0.3s ease;
}

.file-item-modern:hover {
    box-shadow: var(--shadow-medium);
    transform: translateX(5px);
}

.file-item-modern:hover::before {
    transform: scaleY(1);
}

.file-icon-modern {
    width: 50px;
    height: 50px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: white;
    background: var(--danger-gradient);
    margin-right: 1rem;
}

/* Progress Bar Enhancements */
.progress-modern {
    height: 8px;
    border-radius: 10px;
    background: #e9ecef;
    overflow: hidden;
}

.progress-bar-modern {
    background: var(--primary-gradient);
    border-radius: 10px;
    transition: width 0.6s ease;
    position: relative;
    overflow: hidden;
}

.progress-bar-modern::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background-image: linear-gradient(
        -45deg,
        rgba(255, 255, 255, .2) 25%,
        transparent 25%,
        transparent 50%,
        rgba(255, 255, 255, .2) 50%,
        rgba(255, 255, 255, .2) 75%,
        transparent 75%,
        transparent
    );
    background-size: 1rem 1rem;
    animation: progress-bar-stripes 1s linear infinite;
}

@keyframes progress-bar-stripes {
    0% {
        background-position: 1rem 0;
    }
    100% {
        background-position: 0 0;
    }
}

/* Alert Enhancements */
.alert-modern {
    border: none;
    border-radius: var(--border-radius);
    padding: 1rem 1.5rem;
    border-left: 4px solid;
    position: relative;
    overflow: hidden;
}

.alert-modern::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: currentColor;
    opacity: 0.3;
}

.alert-success-modern {
    background: linear-gradient(135deg, #d4edda 0%, #c3e6cb 100%);
    border-left-color: #28a745;
    color: #155724;
}

.alert-danger-modern {
    background: linear-gradient(135deg, #f8d7da 0%, #f5c6cb 100%);
    border-left-color: #dc3545;
    color: #721c24;
}

.alert-warning-modern {
    background: linear-gradient(135deg, #fff3cd 0%, #ffeaa7 100%);
    border-left-color: #ffc107;
    color: #856404;
}

.alert-info-modern {
    background: linear-gradient(135deg, #d1ecf1 0%, #bee5eb 100%);
    border-left-color: #17a2b8;
    color: #0c5460;
}

/* Loading Spinner */
.spinner-modern {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Responsive Utilities */
@media (max-width: 768px) {
    .card-gradient {
        margin-bottom: 1rem;
    }
    
    .upload-area {
        padding: 2rem 1rem;
    }
    
    .file-item-modern {
        padding: 1rem;
    }
    
    .btn-gradient-primary,
    .btn-gradient-success,
    .btn-gradient-warning,
    .btn-gradient-danger {
        width: 100%;
        margin-bottom: 0.5rem;
    }
}

@media (max-width: 576px) {
    .stats-icon {
        width: 50px;
        height: 50px;
        font-size: 1.25rem;
    }
    
    .upload-icon {
        font-size: 2rem;
    }
    
    .file-icon-modern {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    .card-gradient {
        background: #2d3748;
        color: white;
    }
    
    .form-control-modern {
        background: #4a5568;
        border-color: #718096;
        color: white;
    }
    
    .form-control-modern:focus {
        background: #4a5568;
        color: white;
    }
    
    .upload-area {
        background: #4a5568;
        border-color: #718096;
        color: white;
    }
    
    .file-item-modern {
        background: #2d3748;
        border-color: #4a5568;
        color: white;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .btn,
    .alert,
    .footer {
        display: none !important;
    }
    
    .card-gradient {
        box-shadow: none;
        border: 1px solid #dee2e6;
    }
    
    body {
        background: white !important;
    }
}