body {
    font-family: Arial, sans-serif;
    background: #0b1020;
    color: #f5f5f5;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 800px;
    margin: 40px auto;
    padding: 0 16px;
}

h1 {
    text-align: center;
    margin-bottom: 24px;
    letter-spacing: 1px;
}

.card {
    background: #151a2c;
    border-radius: 10px;
    padding: 24px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.4);
}

.top-bar {
    display: flex;
    justify-content: space-between;
    margin-bottom: 16px;
    font-size: 14px;
}

label {
    display: block;
    margin-bottom: 8px;
}

input[type="text"] {
    width: 100%;
    padding: 8px 10px;
    margin: 8px 0 16px 0;
    border-radius: 6px;
    border: 1px solid #444;
    background: #0f1424;
    color: #f5f5f5;
}

button, .btn {
    background: #3b82f6;
    color: #fff;
    padding: 10px 18px;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    font-size: 15px;
    text-decoration: none;
    display: inline-block;
    margin-top: 8px;
}

button:hover, .btn:hover {
    background: #2563eb;
}

.btn.secondary {
    background: #6b7280;
}

.btn.secondary:hover {
    background: #4b5563;
}

.question-text {
    font-size: 18px;
    margin-bottom: 16px;
}

.option {
    display: block;
    background: #1f2937;
    padding: 8px 10px;
    border-radius: 6px;
    margin-bottom: 8px;
    cursor: pointer;
}

.option input[type="radio"] {
    margin-right: 10px;
}

.leaderboard {
    width: 100%;
    border-collapse: collapse;
    margin-top: 12px;
}

.leaderboard th, .leaderboard td {
    border: 1px solid #374151;
    padding: 8px;
    text-align: center;
}

.leaderboard th {
    background: #111827;
}

.warning {
    background: #b91c1c;
    color: #fff;
    padding: 8px 10px;
    border-radius: 6px;
    margin-bottom: 12px;
    font-size: 13px;
}

.info {
    font-size: 13px;
    margin-top: 12px;
    color: #d1d5db;
}