/* Custom CSS for Swimming Academy */
:root {
    --primary-color: #0066cc;
    --secondary-color: #004d99;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
}

body {
    background-color: #f5f7fa;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.navbar-brand {
    font-weight: bold;
    color: var(--primary-color) !important;
}

.sidebar {
    background: linear-gradient(180deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    min-height: 100vh;
    box-shadow: 2px 0 5px rgba(0,0,0,0.1);
}

.sidebar .nav-link {
    color: white !important;
    padding: 12px 20px;
    margin: 2px 0;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.sidebar .nav-link:hover,
.sidebar .nav-link.active {
    background-color: rgba(255,255,255,0.2);
    transform: translateX(5px);
}

.sidebar .nav-link i {
    margin-right: 10px;
    width: 20px;
}

.card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-2px);
}

.card-header {
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 12px 12px 0 0 !important;
    padding: 15px 20px;
}

.btn-primary {
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    border: none;
    border-radius: 8px;
    padding: 8px 20px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0,102,204,0.3);
}

.table {
    border-radius: 8px;
    overflow: hidden;
}

.table thead th {
    background-color: var(--light-color);
    border: none;
    font-weight: 600;
    color: var(--dark-color);
}

.table tbody tr {
    transition: background-color 0.3s ease;
}

.table tbody tr:hover {
    background-color: rgba(0,102,204,0.05);
}

.form-control,
.form-select {
    border-radius: 8px;
    border: 2px solid #e9ecef;
    padding: 10px 15px;
    transition: all 0.3s ease;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(0,102,204,0.25);
}

.alert {
    border-radius: 8px;
    border: none;
}

.badge {
    padding: 6px 12px;
    border-radius: 20px;
    font-weight: 500;
}

.login-container {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-card {
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    overflow: hidden;
    max-width: 400px;
    width: 100%;
}

.login-header {
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 30px;
    text-align: center;
}

.login-body {
    padding: 30px;
}

.stats-card {
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 12px;
    padding: 20px;
    text-align: center;
}

.stats-card h3 {
    margin: 0;
    font-size: 2.5rem;
    font-weight: bold;
}

.stats-card p {
    margin: 0;
    opacity: 0.9;
}

.action-buttons .btn {
    margin: 2px;
    padding: 5px 10px;
    font-size: 0.875rem;
}

.loading {
    text-align: center;
    padding: 20px;
}

.loading i {
    font-size: 2rem;
    color: var(--primary-color);
    animation: spin 1s linear infinite;
}

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

/* Responsive adjustments */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        top: 0;
        left: -250px;
        width: 250px;
        z-index: 1000;
        transition: left 0.3s ease;
    }
    
    .sidebar.show {
        left: 0;
    }
    
    .main-content {
        margin-left: 0 !important;
    }
    
    .table-responsive {
        font-size: 0.875rem;
    }
}

/* 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-in {
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from { transform: translateX(-100%); }
    to { transform: translateX(0); }
}

/* Toast notifications */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1055;
}

.custom-toast {
    border-radius: 8px;
    border: none;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}