/* 跨平台统一样式变量（白底 + 浅灰模块 + 皇家蓝按钮） */
:root {
    color-scheme: light;
    --page-bg: #FFFFFF;
    --page-text: #1C1C1E;
    --page-text-muted: #636366;
    --page-title: #1C1C1E;
    --surface-panel: #FFFFFF;
    --surface-panel-2: #FFFFFF;
    --surface-border: #c4c4cc;
    --surface-shadow: 0 2px 12px rgba(0, 0, 0, 0.22);
    --primary-white: #FFFFFF;
    --primary-gray-50: #F5F5F7;
    --primary-gray-100: #E8E8ED;
    --primary-gray-200: #D1D1D6;
    --primary-gray-300: #C7C7CC;
    --primary-gray-400: #8E8E93;
    --primary-gray-500: #636366;
    --primary-gray-600: #48484A;
    --primary-gray-700: #3A3A3C;
    --primary-gray-800: #2C2C2E;
    --primary-gray-900: #1C1C1E;
    --primary-blue: #0071E3;
    --primary-blue-hover: #0077ED;
    --primary-blue-active: #005BB5;
    --primary-black: #000000;
    --primary-shadow: var(--surface-shadow);
    --primary-shadow-hover: 0 4px 18px rgba(0, 0, 0, 0.28);
    --primary-border-radius: 12px;
    --primary-border-radius-small: 8px;
    /* 使用Web字体确保跨平台字体渲染一致：Inter（英文）+ Noto Sans SC（中文） */
    --primary-font: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif;
    --primary-transition: all 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ========== 跨浏览器重置样式 ========== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
    text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-smooth: always;
    text-rendering: optimizeLegibility;
}

body {
    height: 100%;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: var(--primary-font);
    font-size: 16px;
    line-height: 1.5;
    background-color: #FFFFFF;
    background: #FFFFFF;
    color: #1C1C1E;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-smooth: always;
    -webkit-tap-highlight-color: transparent;
    overflow-x: auto;
    /* 强制布局一致性：防止移动端自动调整 */
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

/* 链接样式重置 */
a {
    text-decoration: none;
    color: inherit;
}

/* 列表样式重置 */
ul, ol {
    list-style: none;
}

/* 表单元素重置 */
input, textarea, select, button {
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    border-radius: 0;
}

/* 图片响应�?*/
img {
    max-width: 100%;
    height: auto;
    border: 0;
}

/* 表格边框合并 */
table {
    border-collapse: collapse;
    border-spacing: 0;
}

/* 清除浮动 */
.clearfix::before,
.clearfix::after {
    content: '';
    display: table;
    clear: both;
}

/* ========== 容器样式 ========== */
/* 固定桌面版式：宽度不足时整页横向滚动，不因断点重排导致模块位移；纵向自顶向下对齐，避免视口高度不同造成整体上下漂移 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
    min-width: 760px;
    flex: 1 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    -webkit-display: flex;
    -webkit-flex-direction: column;
    -webkit-align-items: center;
    -webkit-justify-content: flex-start;
}

/* ========== 标题区域 ========== */
.header {
    text-align: center;
    margin-bottom: 30px;
}

.title {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: center;
    gap: 8px;
    width: 680px;
    margin: 0 auto;
    -webkit-display: flex;
    -webkit-flex-direction: column;
    -webkit-align-items: stretch;
    -webkit-justify-content: center;
}

.chinese-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--page-title);
    letter-spacing: -0.5px;
    line-height: 1.2;
    display: block;
    width: 100%;
    text-align: center;
    margin: 0;
}

.english-title {
    font-size: 10px;
    font-weight: 500;
    color: var(--page-text-muted);
    letter-spacing: 1.5px;
    word-spacing: 4px;
    line-height: 1.4;
    display: block;
    width: 100%;
    text-align: center;
    font-style: normal;
    text-transform: uppercase;
    white-space: nowrap;
    margin: 0;
    padding: 0;
}

/* ========== 主内容区�?========== */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    width: 100%;
    -webkit-display: flex;
    -webkit-flex-direction: column;
    -webkit-align-items: center;
    -webkit-justify-content: flex-start;
}

.input-section {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 24px;
    width: 100%;
    max-width: 680px;
    margin: 0 auto;
    -webkit-display: flex;
    -webkit-flex-direction: column;
    -webkit-align-items: flex-start;
}

/* 文本框样式 */
.text-input {
    width: 100%;
    max-width: 100%;
    height: 265px;
    min-height: 265px;
    padding: 20px;
    border: 1px solid var(--surface-border);
    border-radius: var(--primary-border-radius);
    font-size: 16px;
    font-family: var(--primary-font);
    background-color: var(--surface-panel);
    color: var(--primary-gray-900);
    resize: none;
    box-shadow: none;
    transition: border-color 0.2s ease;
    outline: none;
    line-height: 1.6;
    margin: 0;
    -webkit-appearance: none;
}

.text-input::placeholder {
    color: var(--primary-gray-400);
    opacity: 1;
}

.text-input:focus {
    border-color: var(--primary-blue);
}

/* ========== 模型选择器样式（左：模型；右：上�?�?与截图一致两端对齐，禁止换行�?========== */
.model-selector {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    width: 100%;
    margin-bottom: 16px;
    position: relative;
    -webkit-display: flex;
    -webkit-align-items: center;
    -webkit-justify-content: space-between;
}

.model-selector-start {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    align-items: center;
    gap: 12px;
    flex: 0 1 auto;
    min-width: 0;
}

.model-selector-end {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    align-items: center;
    gap: 8px;
    flex: 0 0 auto;
}

.file-upload-section {
    flex: 0 1 auto;
    min-width: 0;
    max-width: 220px;
}

.file-input {
    padding: 0 8px 0 0;
    border: none;
    border-radius: 0;
    font-size: 16px;
    font-family: var(--primary-font);
    background-color: transparent;
    color: var(--page-text);
    font-weight: 600;
    cursor: pointer;
    transition: var(--primary-transition);
    outline: none;
    box-shadow: none;
    text-align: right;
    width: 100%;
    min-width: 0;
}

.file-input::placeholder {
    color: var(--page-text);
    opacity: 1;
}

.file-input:focus {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.1);
}

/* 文件图标区域（固定占位，避免各浏览器 flex 计算差异导致整行偏移�?*/
.file-icon-section {
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    box-sizing: border-box;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--surface-panel);
    border: 1px solid var(--surface-border);
    border-radius: var(--primary-border-radius-small);
    box-shadow: none;
    -webkit-display: flex;
    -webkit-align-items: center;
    -webkit-justify-content: center;
}

.file-icon {
    width: 32px;
    height: 32px;
    color: var(--primary-gray-700);
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.file-icon svg {
    width: 24px;
    height: 24px;
    display: block;
    flex-shrink: 0;
}

.model-selector-start label {
    flex-shrink: 0;
    font-size: 16px;
    font-weight: 600;
    color: var(--page-text);
    min-width: 80px;
}

.model-selector-start select {
    flex: 0 1 auto;
    min-width: 120px;
    max-width: 240px;
    padding: 12px 16px;
    border: 1px solid var(--surface-border);
    border-radius: var(--primary-border-radius-small);
    font-size: 16px;
    font-family: var(--primary-font);
    background-color: var(--surface-panel);
    color: var(--primary-gray-900);
    cursor: pointer;
    transition: var(--primary-transition);
    outline: none;
    box-shadow: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23636366' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 16px;
}

.model-selector-start select:focus {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.1);
}

.model-selector-start select option {
    padding: 8px;
    font-size: 14px;
    background-color: var(--surface-panel);
    color: var(--primary-gray-900);
}

/* ========== 按钮样式 ========== */
.generate-btn,
.submit-btn {
    padding: 10px 20px;
    font-size: 16px;
    font-weight: 600;
    font-family: var(--primary-font);
    color: var(--primary-white);
    background-color: var(--primary-blue);
    border: none;
    border-radius: var(--primary-border-radius-small);
    cursor: pointer;
    transition: var(--primary-transition);
    box-shadow: none;
    min-width: auto;
    width: auto;
    text-align: center;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    justify-content: center;
    -webkit-display: flex;
    -webkit-align-items: center;
    -webkit-justify-content: center;
    -webkit-appearance: none;
}

.generate-btn:hover,
.submit-btn:hover {
    background-color: var(--primary-blue-hover);
    box-shadow: var(--primary-shadow-hover);
    transform: translateY(-1px);
    -webkit-transform: translateY(-1px);
}

.generate-btn:active,
.submit-btn:active {
    background-color: var(--primary-blue-active);
    transform: translateY(0);
    -webkit-transform: translateY(0);
    box-shadow: var(--primary-shadow);
}

.generate-btn:focus,
.submit-btn:focus {
    outline: none;
    box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.2);
}

/* ========== 问题展示区域样式 ========== */
.questions-section {
    width: 100%;
    max-width: 680px;
    padding: 20px 0;
    box-sizing: border-box;
    margin: 20px auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    -webkit-display: flex;
    -webkit-flex-direction: column;
    -webkit-align-items: center;
}

/* 与截图：带细边框、整行宽的「测试题目」标题条 */
.section-title {
    box-sizing: border-box;
    width: 100%;
    font-size: 24px;
    font-weight: 600;
    color: var(--page-title);
    margin: 0 0 26px 0;
    text-align: center;
    letter-spacing: -0.3px;
    padding: 14px 16px;
    border: none;
    border-radius: var(--primary-border-radius-small);
    background: transparent;
}

.questions-container {
    display: flex;
    flex-direction: column;
    gap: 32px;
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: 16px 0;
    -webkit-display: flex;
    -webkit-flex-direction: column;
}

.question-type-section {
    background-color: var(--surface-panel);
    padding: 24px;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    min-height: 120px;
    overflow: visible;
    border-radius: var(--primary-border-radius);
    box-shadow: none;
    border: 1px solid var(--surface-border);
}

.question-type-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--primary-gray-800);
    margin-bottom: 20px;
    letter-spacing: -0.2px;
    padding-bottom: 12px;
    border-bottom: none;
}

.questions-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: 0;
    -webkit-display: flex;
    -webkit-flex-direction: column;
}

.question-item {
    background-color: transparent;
    padding: 24px;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    min-height: auto;
    height: auto;
    overflow: visible;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    border-radius: 0;
    border: none;
    -webkit-display: flex;
    -webkit-flex-direction: column;
    -webkit-align-items: flex-start;
    -webkit-justify-content: flex-start;
}

.question-header {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 16px;
    -webkit-display: flex;
    -webkit-align-items: flex-start;
}

.question-number {
    font-weight: 700;
    color: #000000;
    font-size: 16px;
    line-height: 1.5;
    min-width: 24px;
}

.question-text {
    font-size: 16px;
    color: var(--primary-gray-900);
    line-height: 1.6;
    flex: 1;
}

.options-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 16px;
    -webkit-display: flex;
    -webkit-flex-direction: column;
}

.option-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px;
    background-color: #FFFFFF;
    cursor: pointer;
    border-radius: 0;
    -webkit-display: flex;
    -webkit-align-items: flex-start;
}

.option-item:hover {
    background-color: #FFFFFF;
}

.option-item input[type="radio"] {
    margin-top: 4px;
    accent-color: var(--primary-blue);
    cursor: pointer;
    -webkit-appearance: radio;
    -moz-appearance: radio;
}

.option-label {
    font-weight: 600;
    color: var(--primary-gray-700);
    font-size: 14px;
    min-width: 20px;
    text-align: center;
}

.option-text {
    font-size: 14px;
    color: var(--primary-gray-800);
    line-height: 1.5;
    flex: 1;
}

.true-false-options {
    flex-direction: row;
    justify-content: flex-start;
    gap: 16px;
    -webkit-flex-direction: row;
    -webkit-justify-content: flex-start;
}

.true-false-options .option-item {
    min-width: 100px;
    justify-content: center;
    -webkit-justify-content: center;
}

.question-footer {
    padding-top: 12px;
    border-top: 1px solid var(--surface-border);
}

.correct-answer {
    font-size: 24px;
    font-weight: 600;
    color: var(--primary-blue);
}

.answer-input {
    margin-top: 16px;
    width: 100%;
}

.answer-input textarea {
    width: 100%;
    padding: 14px 16px 12px;
    border: 1px solid #b0b0b8;
    border-bottom: 1.5px dashed #b0b0b8;
    border-radius: 8px 8px 0 0;
    font-size: 14px;
    font-family: var(--primary-font);
    background-color: transparent;
    color: var(--primary-gray-900);
    resize: vertical;
    min-height: 80px;
    outline: none;
    line-height: 1.6;
    -webkit-appearance: none;
    /* 无阴影过渡 */
    transition: border-color 0.2s ease;
    box-shadow: none;
}

.answer-input textarea:focus {
    border-color: #909098;
    border-bottom: 1.5px dashed #909098;
    box-shadow: none;
    outline: none;
}

.answer-input textarea:hover {
    border-bottom: 1px solid #b0b0b8;
}

.answer-input textarea::placeholder {
    color: var(--primary-gray-400);
    opacity: 1;
}

/* ========== 页面切换导航样式 ========== */
.page-nav-container {
    width: 100%;
    max-width: 680px;
    margin: 80px auto 20px;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    -webkit-display: flex;
    -webkit-flex-direction: column;
    -webkit-align-items: stretch;
}

.spacer {
    height: 20px;
    width: 100%;
}

.page-nav {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    gap: 36px;
    margin: 0;
    width: 100%;
    justify-content: space-between;
    align-items: center;
    -webkit-display: flex;
    -webkit-flex-direction: row;
    -webkit-justify-content: space-between;
    -webkit-align-items: center;
}

.page-nav.vertical {
    flex-direction: column;
    -webkit-flex-direction: column;
}

.page-btn {
    padding: 12px 24px;
    font-size: 16px;
    font-weight: 600;
    font-family: var(--primary-font);
    color: var(--primary-gray-700);
    background-color: var(--surface-panel);
    border: 1px solid var(--surface-border);
    border-radius: var(--primary-border-radius-small);
    cursor: pointer;
    transition: var(--primary-transition);
    box-shadow: none;
    width: auto;
    min-width: 140px;
    text-align: center;
    flex-shrink: 0;
    -webkit-appearance: none;
}

.page-btn:hover {
    background-color: var(--surface-panel-2);
    border-color: var(--primary-gray-300);
    box-shadow: none;
}

.page-btn.active {
    background-color: var(--primary-blue);
    color: var(--primary-white);
    border-color: var(--primary-blue);
}

/* ========== 导出按钮（与导航按钮同行） ========== */
.export-inline {
    position: relative;
    flex-shrink: 0;
}

.export-inline-btn {
    padding: 12px 24px;
    font-size: 16px;
    font-weight: 600;
    font-family: var(--primary-font);
    color: var(--primary-gray-700);
    background-color: var(--surface-panel);
    border: 1px solid var(--surface-border);
    border-radius: var(--primary-border-radius-small);
    cursor: pointer;
    transition: var(--primary-transition);
    box-shadow: none;
    width: auto;
    min-width: 140px;
    text-align: center;
    -webkit-appearance: none;
}

.export-inline-btn:hover {
    background-color: var(--surface-panel-2);
    border-color: var(--primary-gray-300);
}

.export-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    -webkit-transform: translateX(-50%);
    transform: translateX(-50%);
    margin-top: 4px;
    background-color: #FFFFFF;
    border: 1px solid var(--surface-border);
    border-radius: var(--primary-border-radius-small);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    z-index: 100;
    overflow: hidden;
    width: auto;
    white-space: nowrap;
}

.export-option {
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    color: #000000;
    cursor: pointer;
    text-align: center;
}

.export-option:hover {
    background-color: var(--primary-gray-50);
    color: #000000;
}

/* ========== 页面样式 ========== */
.page {
    display: none;
    width: 100%;
}

.page.active {
    display: block;
}

/* ========== 二维码模态框样式 ========== */
.qrcode-modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s ease;
    -webkit-animation: fadeIn 0.3s ease;
}

.qrcode-modal-content {
    background-color: var(--primary-white);
    margin: 5% auto;
    padding: 30px;
    border: 1px solid var(--primary-gray-200);
    border-radius: var(--primary-border-radius);
    width: 90%;
    max-width: 400px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    text-align: center;
    animation: slideIn 0.3s ease;
    -webkit-animation: slideIn 0.3s ease;
}

.close-btn {
    color: var(--primary-gray-400);
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: var(--primary-transition);
}

.close-btn:hover {
    color: var(--primary-gray-700);
}

.qrcode-modal-content h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--primary-gray-900);
    margin-bottom: 20px;
}

#qrcode-container {
    margin: 20px 0;
    padding: 20px;
    background-color: var(--primary-white);
    border-radius: var(--primary-border-radius-small);
    box-shadow: var(--primary-shadow);
    display: inline-block;
}

.qrcode-modal-content p {
    font-size: 14px;
    color: var(--primary-gray-600);
    margin-top: 20px;
}

/* ========== 动画效果 ========== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
        -webkit-transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
        -webkit-transform: translateY(0);
    }
}

@-webkit-keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@-webkit-keyframes slideIn {
    from {
        opacity: 0;
        -webkit-transform: translateY(-50px);
    }
    to {
        opacity: 1;
        -webkit-transform: translateY(0);
    }
}

/* ========== 提交按钮区域 ========== */
.submit-section {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 97px 0 20px 0;
    width: 100%;
    -webkit-display: flex;
    -webkit-justify-content: center;
    -webkit-align-items: center;
}

.submit-section .submit-btn {
    margin: 0 auto;
}

/* ========== 答案页面样式 ========== */
.answers-section {
    width: 100%;
    max-width: 680px;
    padding: 0;
    box-sizing: border-box;
    margin: 0 auto;
}

.answers-container {
    display: flex;
    flex-direction: column;
    gap: 32px;
    width: 100%;
    max-width: 100%;
    margin: 0;
    -webkit-display: flex;
    -webkit-flex-direction: column;
}

.answer-type-section {
    background-color: var(--surface-panel);
    border-radius: var(--primary-border-radius);
    padding: 24px;
    box-shadow: none;
    border: 1px solid var(--surface-border);
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    min-height: 120px;
    overflow: visible;
}

.answer-type-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--primary-gray-800);
    margin-bottom: 20px;
    letter-spacing: -0.2px;
    padding-bottom: 12px;
    border-bottom: none;
}

.answers-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: 0;
    -webkit-display: flex;
    -webkit-flex-direction: column;
}

.answer-item {
    background-color: var(--surface-panel-2);
    border-radius: var(--primary-border-radius-small);
    padding: 24px;
    border: 1px solid var(--surface-border);
    transition: var(--primary-transition);
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    min-height: auto;
    height: auto;
    overflow: visible;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    -webkit-display: flex;
    -webkit-flex-direction: column;
    -webkit-align-items: flex-start;
    -webkit-justify-content: flex-start;
}

.answer-item:hover {
    background-color: var(--surface-panel);
    box-shadow: var(--primary-shadow);
    border-color: var(--primary-gray-300);
}

.answer-header {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 16px;
    -webkit-display: flex;
    -webkit-align-items: flex-start;
}

.correct-answer-display {
    padding: 12px;
    background-color: rgba(0, 113, 227, 0.05);
    border-radius: var(--primary-border-radius-small);
    border-left: 4px solid var(--primary-blue);
}

.answer-label {
    font-weight: 600;
    color: var(--primary-gray-700);
    font-size: 14px;
    margin-right: 8px;
}

.answer-value {
    font-weight: 700;
    color: var(--primary-blue);
    font-size: 16px;
    line-height: 1.6;
}

/* ========== 页脚（与深灰背景一致） ========== */
.site-footer {
    width: 100%;
    flex-shrink: 0;
    background: transparent;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    margin-top: 24px;
}

.site-footer-inner {
    text-align: center;
    padding: 20px 16px;
    color: var(--page-text-muted);
    font-size: 12px;
    line-height: 1.6;
}

.site-footer-inner p {
    margin: 0.35em 0;
}

/* ========== 提示�?/ 加载层（避免默认无样式在各浏览器中错位） ========== */
.notice-area {
    display: none;
    width: 100%;
    max-width: 680px;
    margin: 0 auto 16px;
    box-sizing: border-box;
    justify-content: center;
}

.notice-content {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: nowrap;
    width: 100%;
    padding: 12px 16px;
    border-radius: var(--primary-border-radius-small);
    border: 1px solid var(--surface-border);
    background: var(--surface-panel);
    color: var(--primary-gray-900);
    box-shadow: var(--primary-shadow);
}

.notice-close {
    margin-left: auto;
    flex-shrink: 0;
    border: none;
    background: transparent;
    font-size: 20px;
    line-height: 1;
    cursor: pointer;
    color: var(--primary-gray-600);
    padding: 0 4px;
}

.loading-overlay {
    display: none;
    position: fixed;
    /* 兼容性修复：不使用 inset 简写，改为显式声明各方向，兼容旧版浏览器 */
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 10000;
    background: rgba(0, 0, 0, 0.45);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    -webkit-display: flex;
    -webkit-align-items: center;
    -webkit-justify-content: center;
    -webkit-flex-direction: column;
}

.loading-spinner {
    width: 44px;
    height: 44px;
    border: 3px solid rgba(255, 255, 255, 0.25);
    border-top-color: var(--primary-blue);
    border-radius: 50%;
    animation: spin-loader 0.8s linear infinite;
}

.loading-overlay #loading-text,
.loading-overlay p {
    color: var(--page-title);
    font-size: 14px;
    font-weight: 500;
    margin-top: 16px;
}

@keyframes spin-loader {
    to { transform: rotate(360deg); }
}

/* ========== IE11 兼容处理 ========== */
@media screen and (-ms-high-contrast: active), (-ms-high-contrast: none) {
    .model-selector-start select {
        background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23636366' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
        background-repeat: no-repeat;
        background-position: right 12px center;
        background-size: 16px;
    }
    
    .option-item input[type="radio"] {
        -ms-appearance: radio;
    }
}

/* ========== 跨设备强制一致性保障 ========== */
/* 禁止任何浏览器自动调整布局 */
@supports (-webkit-touch-callout: none) {
    /* iOS Safari 专用 - 字体渲染像微信/抖音一样平滑 */
    body {
        -webkit-text-size-adjust: 100%;
        -webkit-font-smoothing: antialiased;
        font-family: -apple-system, 'PingFang SC', 'Noto Sans SC', sans-serif !important;
    }
}

/* 强制所有元素使用标准盒模型，防止浏览器差异 */
*, *::before, *::after {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}

/* 禁止用户缩放导致的布局变化 */
html {
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

/* 确保所有主要容器严格固定尺寸 */
.container,
.input-section,
.questions-section,
.answers-section,
.page-nav-container {
    max-width: 680px;
    width: 100%;
    margin-left: auto;
    margin-right: auto;
}

/* 强制标题区域固定 */
.title {
    width: 680px;
    max-width: 680px;
    min-width: 680px;
}

/* 强制模型选择器不换行，保持固定布局 */
.model-selector {
    white-space: nowrap;
    overflow: hidden;
}

/* 强制按钮严格居中 */
.submit-section {
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.submit-section .submit-btn {
    margin: 0 auto;
    display: inline-block;
}

/* 禁止任何媒体查询改变布局 - 强制桌面视图 */
@media screen and (max-width: 99999px) {
    .container {
        min-width: 760px;
        max-width: 1200px;
    }
    
    .input-section,
    .questions-section,
    .answers-section,
    .page-nav-container {
        max-width: 680px;
    }
}

/* ========== 手机端自适应 - 只调整宽度和字体，不增加新元素 ========== */
@media screen and (max-width: 768px) {
    /* 移除固定最小宽度，让页面可以垂直滚动 */
    .container {
        min-width: 0;
        max-width: 100%;
        padding: 20px 12px;
    }
    
    /* 所有内容区域自适应手机宽度 */
    .title {
        width: 100%;
        min-width: 0;
        max-width: 100%;
    }
    
    .input-section,
    .questions-section,
    .answers-section,
    .page-nav-container,
    .notice-area {
        max-width: 100%;
        width: 100%;
    }
    
    /* 标题字号缩小，适合手机屏幕 */
    .title {
        width: 100%;
        min-width: 0;
        max-width: 100%;
        padding: 0 4px;
    }
    
    .chinese-title {
        font-size: 24px;
        text-align: left;
        padding-left: 0;
        letter-spacing: 0;
    }
    
    .english-title {
        font-size: 7.5px;
        white-space: normal;
        word-spacing: 1.5px;
        text-align: left;
        padding-left: 0;
        letter-spacing: 0.8px;
        line-height: 1.3;
        display: block;
        width: 100%;
    }
    
    /* 区块标题缩小 */
    .section-title {
        font-size: 18px;
        padding: 10px 12px;
    }
    
    .question-type-title {
        font-size: 17px;
    }
    
    /* 文本框高度调整 */
    .text-input {
        height: 180px;
        min-height: 180px;
        padding: 16px;
        font-size: 15px;
    }
    
    /* 模型选择器自适应换行 */
    .model-selector {
        flex-wrap: wrap;
        white-space: normal;
        overflow: visible;
        gap: 10px;
        align-items: flex-start;
    }
    
    .model-selector-start {
        width: 100%;
        justify-content: flex-start;
    }
    
    .model-selector-end {
        width: 100%;
        justify-content: flex-start;
    }
    
    .model-selector-start label {
        font-size: 15px;
        min-width: auto;
        flex-shrink: 0;
    }
    
    .model-selector-start select {
        min-width: 100px;
        max-width: 160px;
        font-size: 15px;
        padding: 10px 12px;
        padding-right: 36px;
    }
    
    .file-upload-section {
        width: auto;
        max-width: none;
    }
    
    .file-input {
        font-size: 15px;
        max-width: none;
        text-align: left;
    }
    
    .file-icon-section {
        width: 44px;
        height: 44px;
    }
    
    .file-icon {
        width: 24px;
        height: 24px;
    }
    
    /* 按钮宽度自适应 - 与题目页面按钮尺寸一致 */
    .generate-btn,
    .submit-btn {
        width: auto;
        min-width: 140px;
        padding: 12px 24px;
        font-size: 16px;
        text-align: center;
        margin-left: 0;
        align-self: flex-start;
        justify-content: center;
    }
    
    /* 题目卡片适配 */
    .question-type-section {
        padding: 16px;
    }
    
    .question-item {
        padding: 16px 0;
    }
    
    .question-number {
        font-size: 15px;
        min-width: 20px;
    }
    
    .question-text {
        font-size: 15px;
    }
    
    .option-item {
        padding: 10px 0;
        gap: 10px;
    }
    
    .option-label {
        font-size: 14px;
        min-width: 18px;
    }
    
    .option-text {
        font-size: 14px;
    }
    
    .true-false-options {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .true-false-options .option-item {
        min-width: 80px;
    }
    
    /* 简答题输入框 - 底部虚线 */
    .answer-input textarea {
        font-size: 15px;
        padding: 14px 12px 10px;
        min-height: 60px;
    }
    
    /* 答案页面适配 */
    .answers-section {
        max-width: 100%;
    }
    
    .answer-item {
        padding: 16px;
    }
    
    .answer-value {
        font-size: 15px;
    }
    
    /* 导航按钮 */
    .page-nav-container {
        margin: 40px auto 16px;
    }
    
    .page-nav {
        gap: 16px;
    }
    
    .page-btn {
        min-width: auto;
        width: auto;
        padding: 10px 16px;
        font-size: 14px;
        flex: 1;
    }
    
    /* 提交按钮区域 */
    .submit-section {
        margin: 40px 0 16px;
        justify-content: flex-start;
        align-items: flex-start;
    }
    
    .submit-section .submit-btn {
        margin: 0;
    }
    
    /* 二维码弹窗 */
    .qrcode-modal-content {
        width: 85%;
        padding: 20px;
    }
    
    /* 导出测试题按钮（手机端） */
    .export-inline-btn {
        min-width: 100px;
        padding: 10px 14px;
        font-size: 14px;
    }
    
    .export-dropdown {
        min-width: 100%;
    }
    
    /* 移动端上传下拉菜单 */
    .mobile-upload-dropdown {
        display: none;
        position: absolute;
        top: calc(100% + 8px);
        right: 0;
        background: white;
        border-radius: 12px;
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
        overflow: hidden;
        z-index: 1000;
        min-width: 140px;
    }
    
    .mobile-upload-option {
        display: flex;
        align-items: center;
        gap: 10px;
        padding: 12px 16px;
        cursor: pointer;
        transition: background-color 0.2s;
    }
    
    .mobile-upload-option:hover {
        background-color: #f5f5f7;
    }
    
    .upload-option-icon {
        font-size: 18px;
    }
    
    .upload-option-text {
        font-size: 15px;
        color: #1C1C1E;
    }
    
    .model-selector-end {
        position: relative;
    }
    
    /* 移动端隐藏二维码上传模块 */
    .qrcode-modal {
        display: none !important;
    }
}

/* 小屏手机（iPhone SE等）进一步优化 */
@media screen and (max-width: 380px) {
    .title {
        padding: 0 2px;
    }
    
    .chinese-title {
        font-size: 20px;
        letter-spacing: 0;
    }
    
    .english-title {
        font-size: 6.5px;
        letter-spacing: 0.5px;
        word-spacing: 1px;
    }
    
    .model-selector-start select {
        min-width: 80px;
        max-width: 120px;
        font-size: 14px;
        padding: 8px 10px;
        padding-right: 30px;
    }
    
    .model-selector-start label {
        font-size: 14px;
    }
    
    .file-input {
        font-size: 14px;
        max-width: none;
    }
    
    .generate-btn,
    .submit-btn {
        min-width: 120px;
        padding: 10px 20px;
        font-size: 15px;
    }
}
@media print {
    body {
        background-color: #FFFFFF !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }
}