:root {
    --bg: #05060a;
    --text: #f5f5ff;
    --muted: #9a9ab5;
    --accent: #7c5cff;
    --accent-soft: rgba(124, 92, 255, 0.35);
    --radius: 16px;
}

body {
    margin: 0;
    font-family: Poppins, sans-serif;
    background: radial-gradient(circle at top, #1a1b33, #05060a);
    color: var(--text);
}

.container {
    width: min(800px, 90%);
    margin: 40px auto;
    padding: 30px;
    background: rgba(255,255,255,0.05);
    border-radius: var(--radius);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255,255,255,0.1);
    box-shadow: 0 0 30px rgba(0,0,0,0.6);
}

.title {
    text-align: center;
    font-size: 2rem;
    text-shadow: 0 0 20px var(--accent-soft);
}

.subtitle {
    text-align: center;
    color: var(--muted);
    margin-bottom: 20px;
}

.question {
    margin: 20px 0;
    padding: 15px;
    background: rgba(255,255,255,0.04);
    border-radius: var(--radius);
    border: 1px solid rgba(255,255,255,0.08);
}

label {
    display: block;
    margin: 6px 0;
    cursor: pointer;
}

.submit-btn {
    width: 100%;
    padding: 14px;
    margin-top: 20px;
    background: var(--accent);
    border: none;
    border-radius: var(--radius);
    color: white;
    font-size: 1.1rem;
    cursor: pointer;
    box-shadow: 0 0 20px var(--accent-soft);
    transition: 0.2s;
}

.submit-btn:hover {
    transform: scale(1.03);
    box-shadow: 0 0 30px var(--accent-soft);
}

.result {
    margin-top: 25px;
    padding: 20px;
    border-radius: var(--radius);
    text-align: center;
    font-size: 1.2rem;
}

.hidden {
    display: none;
}

.correct {
    background: rgba(0,255,0,0.15);
    border: 1px solid rgba(0,255,0,0.4);
}

.warning {
    background: rgba(255,255,0,0.15);
    border: 1px solid rgba(255,255,0,0.4);
}

.wrong {
    background: rgba(255,0,0,0.15);
    border: 1px solid rgba(255,0,0,0.4);
}