body {
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #cfcfcf;
    color: #333;
    min-height: 100vh;
}

body.login {
    display: flex;
    justify-content: center;
    align-items: center;
}

.card {
    border-radius: 12px !important;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
    background: #fff;
}

h1, h2 {
    color: #363636;
    font-weight: 600;
}

.navbar-custom {
    background-color: rgba(255,255,255,0.9);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.sidebar {
    background: #fff;
    padding: 1rem;
    border-radius: 12px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.sidebar a {
    display: block;
    padding: 0.5rem;
    margin-bottom: 0.3rem;
    color: #4a90e2;
    font-weight: 500;
    border-radius: 6px;
    transition: 0.3s;
    text-decoration: none;
}
.sidebar a:hover {
    background-color: #4a90e2;
    color: #fff;
}

p.message {
    font-size: 14px;
    color: red;
    margin-top: 10px;
}

@media (max-width: 768px) {
    .sidebar {
        margin-bottom: 1rem;
    }
}

.card, .sidebar, .table {
    overflow-x: auto; /* Mobilde yatay kaydırma */
}
.container {
    width: 100%;
    padding: 15px;
}