/* ===== 响应式 - 移动端 (max-width: 767px) ===== */
@media (max-width: 767px) {
    body {
        display: flex;
        justify-content: center;
        align-items: stretch;
        height: 100vh;
        height: 100dvh;
        overflow: hidden;
    }
    .container {
        width: 100%;
        height: 100%;
        overflow: hidden;
        display: flex;
        flex-direction: column;
    }
    .view-section { flex: 1; overflow: hidden; }
    .home-layout {
        flex: 1;
        overflow-y: auto;
        justify-content: flex-start;
        padding-top: 24px;
        padding-left: 16px;
        padding-right: 16px;
    }
    .tab-group {
        flex-wrap: nowrap;
    }
    .tab-btn {
        font-size: 12px;
        padding: 7px 4px;
        white-space: nowrap;
    }
    .tab-text-full { display: none; }
    .tab-text-short { display: inline; }
    .sub-tab-btn {
        padding: 7px 14px;
        font-size: 12px;
        white-space: nowrap;
    }
    .preset-list {
        grid-template-columns: 1fr;
    }
    .quiz-layout-wrapper { display: flex; flex-direction: column; }
    .question-text { font-size: 17px; }
    .result-stats-grid { grid-template-columns: repeat(2, 1fr); }
    .result-layout { padding: 20px 16px; gap: 16px; }
    .result-actions { flex-direction: column; }
    .result-action-btn { padding: 12px 14px; font-size: 14px; }
    .ai-chat-panel {
        right: 12px;
        bottom: 132px;
        left: 12px;
        width: auto;
        height: min(56vh, 460px);
    }
    .ai-analyze-fab {
        bottom: 76px;
        right: 24px;
    }
}

/* ===== 响应式 - 桌面端 (min-width: 768px) ===== */
@media (min-width: 768px) {
    body {
        background: linear-gradient(135deg, #e0c3fc 0%, #8ec5fc 100%);
        background-attachment: fixed;
        display: flex;
        justify-content: center;
        align-items: flex-start;
        padding: 40px 0;
        min-height: 100vh;
        min-height: 100dvh;
    }
    .container {
        width: 90%;
        max-width: 1000px;
        border-radius: 20px;
        box-shadow: var(--shadow-md);
        max-height: calc(100vh - 80px);
        max-height: calc(100dvh - 80px);
    }
    .container:has(#homeView.active) { height: auto; }
    .container:has(#quizView.active),
    .container:has(#resultView.active) { height: calc(100vh - 80px); height: calc(100dvh - 80px); }
    #homeView { height: auto; min-height: 0; }
    #quizView, #resultView { flex: 1; overflow: hidden; }
    .header { border-radius: 20px 20px 0 0; }
    .home-layout { padding: 40px 30px; overflow-y: auto; flex: 1; }
    .quiz-layout-wrapper { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; height: 100%; }
    .quiz-left-panel { border-right: 1px solid #eee; padding-right: 20px; display: flex; flex-direction: column; }
    .quiz-right-panel { padding-left: 10px; overflow-y: auto; }
    .question-text { font-size: 20px; }
    .quiz-footer { border-radius: 0 0 20px 20px; }
}

/* ===== 减少动画偏好 ===== */
@media (prefers-reduced-motion: reduce) {
    html:focus-within { scroll-behavior: auto; }
    *, *::before, *::after {
        animation-duration: 0.2s !important;
        transition-duration: 0.2s !important;
    }
    .ai-loading-spinner {
        animation-duration: 1.2s !important;
    }
}