body {
    background: url('/images/bg.jpg') no-repeat center center fixed;
    background-size: cover;
    min-height: 100vh;
}

.navbar {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.navbar-brand {
    font-weight: bold;
}

.card {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(2px);
}

.card-header {
    font-weight: 600;
    background: rgba(0, 0, 0, 0.75) !important;
}

.alert {
    backdrop-filter: blur(2px);
}

.leaderboard .table-warning {
    background-color: #fff3cd !important;
}