/*******************************************************************************
QUIZ CARD STYLES
交互式问答卡片样式
*******************************************************************************/

:root {
    --quiz-bg: #ffffff;
    --quiz-border: #d8d8d2;
    --quiz-shadow: 0 2px 10px rgba(20, 20, 20, 0.06);
    --quiz-shadow-hover: 0 8px 20px rgba(20, 20, 20, 0.1);
    --quiz-title-text: #1e1e1e;
    --quiz-muted-text: #686868;
    --quiz-answer-bg: #f7f7f1;
    --quiz-answer-border: #d8d8cc;
    --quiz-answer-text: #1f1f1f;
    --quiz-indicator-bg: #edf2f8;
    --quiz-indicator-border: #c8d5e6;
    --quiz-indicator-text: #446b99;
    --quiz-focus-ring: rgba(70, 112, 163, 0.28);
}

html[data-theme="dark"] {
    --quiz-bg: #232323;
    --quiz-border: #3f3f3f;
    --quiz-shadow: 0 2px 12px rgba(0, 0, 0, 0.28);
    --quiz-shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.36);
    --quiz-title-text: #e6e6e6;
    --quiz-muted-text: #b2b2b2;
    --quiz-answer-bg: #2a2a2a;
    --quiz-answer-border: #4b4b4b;
    --quiz-answer-text: #dddddd;
    --quiz-indicator-bg: #2f3a49;
    --quiz-indicator-border: #45566f;
    --quiz-indicator-text: #9ec0e9;
    --quiz-focus-ring: rgba(123, 173, 227, 0.34);
}

.quiz-card {
    background: var(--quiz-bg);
    border: 1px solid var(--quiz-border);
    border-radius: 10px;
    box-shadow: var(--quiz-shadow);
    margin: 1.5em 0;
    overflow: hidden;
    transition: box-shadow 240ms ease, transform 240ms ease;
    max-width: 55%;
    width: 55%;
}

.quiz-card:hover {
    box-shadow: var(--quiz-shadow-hover);
    transform: translateY(-1px);
}

.quiz-question {
    cursor: pointer;
    user-select: none;
    padding: 15px 56px 15px 16px;
    position: relative;
    font-weight: 600;
    color: var(--quiz-title-text);
    line-height: 1.52;
    transition: background-color 220ms ease, color 220ms ease;
}

.quiz-question:hover {
    background: var(--quiz-indicator-bg);
}

.quiz-question::after {
    content: "+";
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%) rotate(0deg);
    width: 24px;
    height: 24px;
    border-radius: 999px;
    border: 1px solid var(--quiz-indicator-border);
    background: var(--quiz-indicator-bg);
    color: var(--quiz-indicator-text);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.05em;
    font-weight: 600;
    line-height: 1;
    transition: transform 300ms ease, background-color 220ms ease, border-color 220ms ease;
}

.quiz-card.expanded .quiz-question::after {
    content: "−";
    transform: translateY(-50%) rotate(180deg);
}

.quiz-answer {
    background: var(--quiz-answer-bg);
    border-top: 1px solid transparent;
    padding: 0 16px;
    line-height: 1.6;
    color: var(--quiz-answer-text);
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transform: translateY(-8px);
    transition:
        max-height 380ms cubic-bezier(0.22, 1, 0.36, 1),
        opacity 260ms ease,
        transform 260ms ease,
        padding 260ms ease,
        border-color 260ms ease;
}

.quiz-card.expanded .quiz-answer {
    border-top-color: var(--quiz-answer-border);
    padding: 14px 16px 16px;
    opacity: 1;
    transform: translateY(0);
}

.quiz-answer p:first-child {
    margin-top: 0;
}

.quiz-answer p:last-child {
    margin-bottom: 0;
}

@media (max-width: 760px) {
    .quiz-card {
        width: 100%;
        max-width: 100%;
        margin-left: 0;
        margin-right: 0;
        border-radius: 10px;
        border-left: 1px solid var(--quiz-border);
        border-right: 1px solid var(--quiz-border);
        box-sizing: border-box;
    }

    .quiz-question {
        padding: 14px 48px 14px 12px;
    }

    .quiz-answer {
        padding: 0 12px;
    }

    .quiz-card.expanded .quiz-answer {
        padding: 12px;
    }
}

.quiz-question:focus-visible {
    outline: none;
    box-shadow: inset 0 0 0 3px var(--quiz-focus-ring);
}

.quiz-question[aria-expanded="true"] {
    color: var(--quiz-title-text);
}

@media (prefers-reduced-motion: reduce) {
    .quiz-card,
    .quiz-question,
    .quiz-question::after,
    .quiz-answer {
        transition: none !important;
    }
}