/* Academic Journal Admin Styles */
:root {
    --primary-dark: #2c3e50;
    --secondary-dark: #34495e;
    --accent-red: #e74c3c;
    --accent-red-dark: #c0392b;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --text-primary: #2c3e50;
    --text-muted: #6c757d;
    --border-light: #dee2e6;
    --border-medium: #ced4da;
    --shadow-light: 0 2px 4px rgba(0,0,0,0.1);
    --radius-sm: 4px;
    --radius-lg: 8px;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --transition-fast: 0.2s ease;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-serif: Georgia, 'Times New Roman', serif;
}

/* General Styles */
body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--text-primary);
}

/* Form Enhancements */
.form-control:focus {
    border-color: var(--accent-red);
    box-shadow: 0 0 0 0.2rem rgba(231, 76, 60, 0.25);
}

.btn-danger {
    background: linear-gradient(135deg, var(--accent-red) 0%, var(--accent-red-dark) 100%);
    border: none;
}

.btn-danger:hover {
    background: linear-gradient(135deg, var(--accent-red-dark) 0%, var(--accent-red) 100%);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.btn-warning {
    background: linear-gradient(135deg, #f39c12 0%, #e67e22 100%);
    border: none;
}

.btn-warning:hover {
    background: linear-gradient(135deg, #e67e22 0%, #d35400 100%);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

/* Card Styles */
.card {
    border: none;
    box-shadow: 0 2px 8px var(--shadow-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: transform var(--transition-fast);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

.card-header {
    background: linear-gradient(135deg, var(--accent-red) 0%, var(--accent-red-dark) 100%);
    color: white;
    border: none;
    font-weight: 600;
}

/* Table Styles */
.table {
    margin-bottom: 0;
}

.table thead {
    background: linear-gradient(135deg, var(--accent-red) 0%, var(--accent-red-dark) 100%);
    color: white;
}

.table th {
    font-weight: 600;
    border: none;
    padding: var(--spacing-md);
}

.table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-light);
    vertical-align: middle;
}

.table-hover tbody tr:hover {
    background-color: rgba(231, 76, 60, 0.05);
}

/* Alert Styles */
.alert-success {
    background-color: #d4edda;
    border-color: #c3e6cb;
    color: #155724;
    border-left: 4px solid #28a745;
    border-radius: var(--radius-sm);
}

/* Badge Styles */
.badge {
    font-weight: 500;
    padding: 0.375rem 0.75rem;
}

.badge.bg-danger {
    background: linear-gradient(135deg, var(--accent-red) 0%, var(--accent-red-dark) 100%) !important;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container-fluid {
        padding-left: 0.5rem;
        padding-right: 0.5rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .table {
        font-size: 0.875rem;
    }
    
    .btn-sm {
        font-size: 0.75rem;
        padding: 0.25rem 0.5rem;
    }
}

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

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

/* Loading Spinner */
.spinner {
    border: 3px solid #f3f3f3;
    border-top: 3px solid var(--accent-red);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

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