:root {
    --surface: #f5f6f8;
    --primary-600: #0d6efd;
    --border-soft: #e8e8ee;
}

body {
    font-family: "Noto Sans TC", "Microsoft JhengHei", sans-serif;
    background: radial-gradient(circle at top right, #ffffff 0%, var(--surface) 45%, #eef2f7 100%);
}

.question-card {
    border: 1px solid var(--border-soft);
}

.quiz-sticky-panel {
    position: sticky;
    top: calc(env(safe-area-inset-top, 0px) + 8px);
    z-index: 30;
}

.option-item {
    display: flex;
    gap: 0.75rem;
    align-items: flex-start;
    border: 1px solid #e5e7eb;
    border-radius: 0.5rem;
    padding: 0.75rem;
    background: #ffffff;
    cursor: pointer;
    margin: 0;
    user-select: none;
    transition: border-color 0.15s ease, background-color 0.15s ease, box-shadow 0.15s ease;
}

.option-item .option-radio {
    margin-top: 0.2rem;
    flex: 0 0 auto;
}

.option-item .option-copy {
    flex: 1 1 auto;
    line-height: 1.45;
}

.option-item .option-key {
    font-weight: 700;
    margin-right: 0.25rem;
}

.option-item:hover {
    border-color: #b7cdfa;
    background: #f8fbff;
}

.option-item:focus-within {
    border-color: #8bb0f6;
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.15);
}

.option-item.selected {
    border-color: var(--primary-600);
    background: #eef4ff;
}

.question-card .option-radio:checked {
    border-color: var(--primary-600);
}

.quiz-progress-card .progress {
    height: 0.75rem;
}

.encouragement-box {
    border: 1px solid #b6d4fe;
    background: #e7f1ff;
    color: #084298;
}

.result-score {
    padding: 0.75rem 1rem;
    border: 1px solid #dbe3ef;
    border-radius: 0.75rem;
    background: #ffffff;
}

.result-feedback {
    background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
    border: 1px solid #dbe3ef;
}

#quiz-submit-btn.is-submitting {
    opacity: 0.85;
    pointer-events: none;
}

.attention {
    animation: question-attention 0.85s ease;
}

@keyframes question-attention {
    0% {
        box-shadow: 0 0 0 0 rgba(13, 110, 253, 0);
        transform: translateY(0);
    }
    30% {
        box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.2);
        transform: translateY(-2px);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(13, 110, 253, 0);
        transform: translateY(0);
    }
}

@media (max-width: 767.98px) {
    .quiz-sticky-panel {
        top: calc(env(safe-area-inset-top, 0px) + 4px);
    }

    .quiz-progress-card .card-body {
        padding-top: 0.75rem;
        padding-bottom: 0.75rem;
    }
}