/* Custom CSS for HR System */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f8f9fa;
}

.login-container {
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-card {
    background: white;
    border-radius: 15px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    width: 100%;
    max-width: 400px;
}

.login-header {
    background: linear-gradient(135deg, #007bff 0%, #0056b3 100%);
    color: white;
    padding: 2rem;
    text-align: center;
    }

    .login-body {
    padding: 2rem;
}

.form-control:focus {
    border-color: #007bff;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

.btn-login {
    background: linear-gradient(135deg, #007bff 0%, #0056b3 100%);
    border: none;
    padding: 0.75rem;
    font-weight: 600;
    color: white;
}

.btn-login:hover {
    background: linear-gradient(135deg, #0056b3 0%, #004085 100%);
    color: white;
}

.login-logo {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
}

.alert {
    margin-bottom: 1rem;
}

.sidebar {
    min-height: 100vh;
    background: var(--primary-color);
}

.sidebar .nav-link {
    color: #fff;
    padding: 0.75rem 1rem;
    border-radius: 0.25rem;
    margin: 0.125rem 0;
}

.sidebar .nav-link:hover,
.sidebar .nav-link.active {
    background: rgba(255, 255, 255, 0.1);
}

.card-stat {
    border: none;
    border-radius: 10px;
    transition: transform 0.2s;
}

.card-stat:hover {
    transform: translateY(-5px);
}

/* Loading spinner */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Responsive tables */
.table-responsive table {
    min-width: 800px;
}

/* Custom buttons */
.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border: none;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #2c3e50 0%, #2980b9 100%);
}

#btn-back-to-top {
    position: fixed;
    bottom: 40px;
    right: 40px;
    display: none; /* Hidden by default */
    z-index: 9999; /* Ensure it's above other elements */
}