body {
    background: #f0f2f5;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.sidebar {
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    box-shadow: 2px 0 10px rgba(0,0,0,0.1);
}

.sidebar .nav-link {
    color: rgba(255,255,255,0.8);
    padding: 12px 20px;
    margin: 5px 0;
    border-radius: 10px;
    transition: all 0.3s;
    cursor: pointer;
}

.sidebar .nav-link:hover,
.sidebar .nav-link.active {
    background: rgba(255,255,255,0.2);
    color: white;
}

.sidebar .nav-link i {
    width: 25px;
    margin-right: 10px;
}

.logout-btn {
    color: #dc3545 !important;
}

.logout-btn:hover {
    background: rgba(220, 53, 69, 0.2) !important;
}

.login-card {
    max-width: 450px;
    margin: 80px auto;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
}

.btn-login {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    padding: 12px;
    font-weight: 600;
}

.card {
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    border: none;
    margin-bottom: 20px;
}

.card-header {
    background: white;
    border-bottom: 1px solid #eef2f7;
    padding: 15px 20px;
    font-weight: 600;
    border-radius: 15px 15px 0 0 !important;
}

@media (max-width: 768px) {
    .sidebar {
        min-height: auto;
        margin-bottom: 20px;
    }
}