.kviz-wrapper {
    max-width: 620px;
    margin: 20px auto;
    padding: 28px;
    background: #111827;
    border-radius: 18px;
    color: #ffffff;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
    user-select: none;
    -webkit-user-select: none;
}

.kviz-screen {
    display: none;
    flex-direction: column;
}

.kviz-screen.active {
    display: flex;
}

#kviz-start-screen, #kviz-result-screen {
    text-align: center;
    padding: 20px 0;
}

#kviz-start-screen h2, #kviz-result-screen h2 {
    font-size: 30px;
    font-weight: 800;
    margin-bottom: 12px;
    color: #ffffff;
}

#kviz-start-screen p, #kviz-result-screen p {
    color: #9ca3af;
    font-size: 15px;
    margin-bottom: 24px;
    line-height: 1.6;
}

.kviz-header-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    font-weight: 700;
    color: #9ca3af;
    letter-spacing: 0.5px;
    margin-bottom: 18px;
    text-transform: uppercase;
}

.kviz-tag {
    background: #1f2937;
    color: #38bdf8;
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 11px;
    border: 1px solid #0284c7;
}

.kviz-question {
    font-size: 19px;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 22px;
    line-height: 1.45;
}

.kviz-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 26px;
}

.kviz-option {
    background: #1f2937;
    border: 2px solid #374151;
    padding: 14px 18px;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    color: #e5e7eb;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
}

.kviz-option:hover {
    background: #374151;
    border-color: #4b5563;
}

.kviz-option.selected {
    background: #1e3a8a;
    border-color: #3b82f6;
    color: #ffffff;
    box-shadow: 0 0 12px rgba(59, 130, 246, 0.4);
}

.kviz-footer-actions {
    display: flex;
    justify-content: flex-end;
}

.kviz-btn {
    padding: 14px 28px;
    border: none;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 800;
    cursor: pointer;
    transition: transform 0.1s ease, background-color 0.2s ease;
    letter-spacing: 0.5px;
}

.kviz-btn-primary {
    background: #2563eb;
    color: white;
}

.kviz-btn-primary:hover:not(:disabled) {
    background: #1d4ed8;
    transform: translateY(-1px);
}

.kviz-btn:disabled {
    background: #374151;
    color: #6b7280;
    cursor: not-allowed;
}

.kviz-score-box {
    font-size: 38px;
    font-weight: 800;
    color: #34d399;
    font-family: monospace;
    margin-bottom: 18px;
    background: #1f2937;
    padding: 18px 24px;
    border-radius: 14px;
    display: inline-block;
    border: 1px solid #059669;
}