body {
    background: linear-gradient( rgba(255, 255, 255, 0.75), rgba(255, 255, 255, 0.75) ), url('/images/Sib.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    font-family: 'Segoe UI', sans-serif;
    color: #333;
    margin: 0;
    padding: 0;
}

.navbar {
    background-color: rgba(31, 41, 55, 0.95) !important;
    backdrop-filter: blur(5px);
}

.navbar-brand {
    font-size: 28px;
    font-weight: bold;
}

.nav-link {
    font-size: 16px;
    transition: 0.3s;
}

    .nav-link:hover {
        color: #60a5fa !important;
    }

h1 {
    font-weight: 700;
}

.lead {
    color: #4b5563;
}
.btn-primary {
    background-color: #2563eb;
    border: none;
    border-radius: 10px;
}

    .btn-primary:hover {
        background-color: #1d4ed8;
    }

.btn-outline-dark {
    border-radius: 10px;
}
.card {
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.95);
    transition: 0.3s;
}

.card-hover:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.10);
}

.card h3 {
    font-weight: 700;
}

.card p {
    font-size: 15px;
}

.alert {
    border-radius: 15px;
    font-size: 16px;
    background: rgba(255,255,255,0.95);
}

.table {
    margin-bottom: 0;
    background: white;
}

    .table thead th {
        font-weight: 700;
        font-size: 15px;
        border-bottom: 2px solid #dee2e6;
    }

    .table tbody tr:hover {
        background-color: #f8fafc;
    }

    .table td {
        vertical-align: middle;
    }

.badge {
    font-size: 14px;
    border-radius: 10px;
}

footer {
    font-size: 14px;
    color: #374151;
    background: rgba(255,255,255,0.8);
}

@media (max-width: 768px) {
    .navbar-brand {
        font-size: 22px;
    }

    h1 {
        font-size: 32px;
    }

    .btn-lg {
        width: 100%;
        margin-bottom: 10px;
    }
}