/* ==================== 移动端适配样式 ==================== */

html {
    touch-action: pan-x pan-y;
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
}

* { touch-action: pan-x pan-y; }

/* ==================== 移动端导航遮罩 ==================== */
.nav-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 99;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
}

.nav-overlay.show {
    opacity: 1;
    visibility: visible;
}

/* ==================== 存储模式 ==================== */
.storage-mode-badge {
    display: none;
    position: fixed;
    top: 10px; right: 10px;
    z-index: 100;
    padding: 4px 10px;
    background: var(--warning);
    color: white;
    border-radius: 15px;
    font-size: 11px;
    font-weight: 500;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}
body.remote-mode .storage-mode-badge { display: block; }
body.remote-mode:not([data-page="home"]) .storage-mode-badge { display: none !important; }
body.remote-mode .nav-link[data-page="import"],
body.remote-mode .import-btn { display: none !important; }
body.remote-mode .bank-actions .btn-danger,
body.remote-mode .question-item .btn-danger { display: none !important; }

/* ==================== 平板端 (768px - 1024px) ==================== */
@media screen and (max-width: 1024px) {
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .practice-layout { flex-direction: column; align-items: center; }
    .practice-main { width: 100%; min-width: 0; }
    .side-panels {
        width: 300px; min-width: 300px; max-width: 300px;
        flex-direction: column; gap: 15px;
    }
    .side-panel { flex: none; width: 300px; min-width: 300px; max-width: 300px; }
}

/* ==================== 手机端 (小于768px) ==================== */
@media screen and (max-width: 768px) {
    html, body {
        overflow-x: hidden !important;
        width: 100% !important;
        max-width: 100vw !important;
        background-attachment: scroll !important;
    }

    .app-wrapper, .main-content, .page, .manage-section, .question-browser, .bank-list {
        max-width: 100% !important;
        overflow-x: hidden !important;
        box-sizing: border-box !important;
    }

    .top-nav {
        background: var(--bg-card-solid);
        box-shadow: none;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-inner {
        flex-wrap: wrap;
        height: auto;
        padding: 12px 16px;
        gap: 0;
    }

    .nav-brand {
        flex: 1;
    }

    .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        gap: 2px;
        padding-top: 12px;
        border-top: 1px solid var(--border-light);
        margin-top: 12px;
    }

    .nav-links.mobile-open {
        display: flex;
    }

    .nav-link {
        width: 100%;
        padding: 14px 16px;
        border-radius: 12px;
        font-size: 15px;
        gap: 12px;
    }

    .nav-link span { display: inline !important; }
    .nav-link i { font-size: 16px; width: 20px; text-align: center; }

    .main-content {
        padding: 20px 16px 16px;
    }

    .hero-section { padding: 32px 0 24px; }
    .hero-title { font-size: 36px; letter-spacing: -1px; }
    .hero-subtitle { font-size: 14px; margin-bottom: 24px; }
    .hero-badge { font-size: 10px; padding: 4px 14px; margin-bottom: 16px; }
    .hero-actions { flex-direction: column; align-items: stretch; }
    .btn-giant, .btn-glass { width: 100%; justify-content: center; padding: 14px 24px; font-size: 15px; }

    .stats-strip {
        flex-wrap: wrap;
        gap: 10px;
        margin-bottom: 24px;
    }
    .stat-pill {
        flex: 1 1 calc(50% - 5px);
        min-width: 0;
        padding: 14px 16px;
        gap: 10px;
    }
    .stat-num { font-size: 22px; }
    .stat-icon-sm { width: 34px; height: 34px; font-size: 14px; border-radius: 10px; }
    .stat-tag { font-size: 10px; }

    .bento-grid { grid-template-columns: 1fr; }
    .bento-wide { grid-column: span 1; }
    .bento-card { padding: 20px; }

    .section-header {
        margin-bottom: 20px;
        padding-top: 40px;
    }
    .section-header h1 { font-size: 22px; }

    .page h1 { font-size: 22px; margin-bottom: 16px; }

    .import-section { padding: 20px; }
    .upload-area { padding: 30px 16px; }
    .upload-area i { font-size: 36px; }

    .manage-section { padding: 16px; }

    .bank-card {
        flex-direction: column;
        align-items: stretch;
        padding: 16px;
    }
    .bank-info { margin-bottom: 10px; }
    .bank-stats { flex-direction: row; gap: 8px; flex-wrap: wrap; }
    .bank-actions { flex-direction: row; gap: 8px; flex-wrap: wrap; }
    .bank-actions .btn { flex: 1; justify-content: center; min-width: 0; }

    .browser-header { flex-direction: column; gap: 8px; margin-bottom: 12px; }
    .browser-header h2 { font-size: 14px; word-break: break-all; }
    .filter-bar { flex-direction: column; gap: 8px; }
    .filter-bar select { width: 100%; padding: 8px; font-size: 13px; }

    .question-list { gap: 10px; }
    .question-item { padding: 12px; }
    .question-item .question-header { flex-wrap: wrap; gap: 5px; margin-bottom: 8px; }
    .question-item .question-content { font-size: 13px; margin-bottom: 8px; }
    .question-item .option-item { padding: 6px 10px; font-size: 12px; }
    .question-item .question-actions { flex-wrap: wrap; gap: 6px; }
    .question-item .question-actions .btn { padding: 4px 8px; font-size: 11px; }

    .practice-header-info {
        flex-wrap: wrap;
        gap: 6px;
        font-size: 12px;
    }
    .practice-header-info .btn { padding: 4px 8px; font-size: 11px; }
    .practice-mode-badge { font-size: 10px !important; padding: 2px 6px !important; }

    .practice-layout { flex-direction: column; }
    .practice-main { padding: 0; }

    .settings-row-top, .settings-row-bottom { grid-template-columns: 1fr; gap: 12px; }
    .settings-card { padding: 16px; }

    .question-card { padding: 16px; margin-bottom: 140px; }
    .question-header { flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
    .question-type { font-size: 11px; padding: 2px 6px; }
    .question-id-badge { font-size: 10px; }
    .question-chapter { font-size: 11px; }
    .question-content { font-size: 15px; margin-bottom: 14px; }
    .option-btn { padding: 4px 14px; font-size: 14px; }
    .option-key { width: 28px; height: 28px; font-size: 13px; }

    .question-content.text-sm { font-size: 14px; line-height: 1.6; }
    .question-content.text-xs { font-size: 13px; line-height: 1.5; }
    .question-content.text-xxs { font-size: 12px; line-height: 1.4; }
    .question-content.text-micro { font-size: 11px; line-height: 1.3; }

    .option-text.text-sm { font-size: 13px; }
    .option-text.text-xs { font-size: 12px; }
    .option-text.text-xxs { font-size: 11px; }

    .practice-actions { flex-direction: column; gap: 8px; }
    .practice-actions .btn { width: 100%; justify-content: center; }

    .answer-result { padding: 10px 12px; font-size: 13px; }

    .practice-result { padding: 24px; }
    .result-stats { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .result-item { padding: 16px; }
    .result-value { font-size: 24px; }

    .side-panels {
        display: flex !important;
        flex-direction: column;
        align-items: center;
        width: 100%;
        gap: 10px;
        margin-top: 16px;
        position: static;
        max-height: none;
    }
    .side-panel { width: 100%; max-width: 400px; }

    .collapsible-panel .panel-header { padding: 12px 14px; }
    .collapsible-panel .panel-content { padding: 10px; }

    .ranking-item { padding: 10px; flex-direction: column; align-items: flex-start; gap: 8px; }
    .ranking-info { width: 100%; }

    .question-nav-grid { gap: 5px; justify-content: center; }
    .nav-btn { width: 30px; height: 30px; font-size: 11px; }

    .modal-content {
        width: 90%;
        max-width: 360px;
        max-height: 80vh;
        overflow-y: auto;
    }

    .chapter-list { grid-template-columns: 1fr; gap: 8px; }
    .chapter-item { padding: 10px 14px; }
    .chapter-name { font-size: 13px; max-width: 160px; }

    .storage-mode-badge { top: 15px; right: 70px; font-size: 11px; padding: 5px 10px; }
}

/* ==================== 小屏幕 (小于480px) ==================== */
@media screen and (max-width: 480px) {
    .stat-pill { flex: 1 1 100%; }
    .hero-title { font-size: 30px; }
    .stat-num { font-size: 20px; }
    .modal-content { width: 95%; max-width: none; border-radius: 16px; }
}