/* ========================================
   Zenith Intelligence (极智学习) - 企业级样式表
   ======================================== */

/* Google Inter 字体导入 */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Noto+Sans+SC:wght@400;500;600;700&display=swap');

/* CSS 变量定义 - 企业级深蓝色系 */
:root {
    /* 主色调 - 深蓝 */
    --primary-color: #1E40AF;
    --primary-hover: #1E3A8A;
    --primary-light: #EFF6FF;

    /* 辅助色 - 青色 */
    --secondary-color: #06B6D4;
    --secondary-hover: #0891B2;
    --secondary-light: #ECFEFF;

    /* 功能色 */
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --info-color: #3b82f6;

    /* Slate灰度系统 */
    --slate-50: #F8FAFC;
    --slate-100: #F1F5F9;
    --slate-200: #E2E8F0;
    --slate-300: #CBD5E1;
    --slate-400: #94A3B8;
    --slate-500: #64748B;
    --slate-600: #475569;
    --slate-700: #334155;
    --slate-800: #1E293B;
    --slate-900: #0F172A;

    /* 兼容旧变量 */
    --gray-50: var(--slate-50);
    --gray-100: var(--slate-100);
    --gray-200: var(--slate-200);
    --gray-300: var(--slate-300);
    --gray-400: var(--slate-400);
    --gray-500: var(--slate-500);
    --gray-600: var(--slate-600);
    --gray-700: var(--slate-700);
    --gray-800: var(--slate-800);
    --gray-900: var(--slate-900);

    /* 背景色 */
    --bg-primary: #ffffff;
    --bg-secondary: var(--slate-50);
    --bg-tertiary: var(--slate-100);

    /* 深色模式背景 */
    --bg-dark: var(--slate-900);
    --surface-dark: var(--slate-800);

    /* 文字色 */
    --text-primary: var(--slate-900);
    --text-secondary: var(--slate-600);
    --text-tertiary: var(--slate-400);

    /* 边框 */
    --border-color: var(--slate-200);
    --border-radius-sm: 6px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    --border-radius-full: 9999px;

    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* 间距 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;

    /* 字体 - Inter优先 */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans SC', sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-md: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 30px;

    /* 过渡 */
    --transition-fast: 150ms ease;
    --transition-normal: 200ms ease-out;
    --transition-slow: 350ms ease;
}

/* 重置样式 */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    line-height: 1.6;
    color: var(--text-primary);
    background:
        radial-gradient(circle at 10% 20%, rgba(30, 64, 175, 0.08) 0%, transparent 25%),
        radial-gradient(circle at 90% 80%, rgba(6, 182, 212, 0.08) 0%, transparent 25%),
        radial-gradient(circle at 50% 50%, rgba(30, 64, 175, 0.05) 0%, transparent 35%),
        linear-gradient(135deg, var(--slate-50) 0%, #EFF6FF 50%, var(--slate-50) 100%);
    background-attachment: fixed;
    min-height: 100vh;
}

/* ========================================
   布局
   ======================================== */

html,
body {
    height: 100%;
    margin: 0;
    padding: 0;
}

.app-container {
    width: 100%;
    height: 100vh;
    margin: 0;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    overflow-y: auto;
    padding-bottom: 100px;
    /* 为历史记录按钮留出空间 */
}

/* ========================================
   导航菜单
   ======================================== */

.nav-menu {
    margin-bottom: var(--spacing-xl);
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(255, 255, 255, 0.5);
}

.nav-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
}

.nav-container>.system-status {
    margin-left: auto;
    flex-shrink: 0;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: transparent;
    color: var(--text-primary);
    /* Changed to text-primary for higher contrast */
    font-size: var(--font-size-md);
    font-weight: 600;
    /* Increased font weight for clarity */
    cursor: pointer;
    border-radius: var(--border-radius-md);
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
}

.nav-item svg {
    width: 20px;
    height: 20px;
}

.nav-item:hover {
    color: var(--primary-color);
    background: var(--primary-light);
    transform: translateY(-1px);
}

.nav-item.active {
    color: var(--primary-color);
    background: var(--primary-light);
    border: 1px solid rgba(30, 64, 175, 0.2);
}

.nav-item.active:hover {
    background: var(--primary-light);
}

/* ========================================
   顶部标题栏
   ======================================== */

.header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-xl) 0;
}

.header-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
}

.header-content .nav-container {
    width: 100%;
    max-width: 1000px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-icon {
    width: 40px;
    height: 40px;
    color: var(--primary-color);
}

.header h1 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-primary);
    background: linear-gradient(135deg, #1E40AF, #06B6D4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: var(--font-size-md);
    color: var(--text-secondary);
}

/* 系统状态显示 */
.system-status {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.8);
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border-color);
}

.status-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
}

.status-icon {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
    color: transparent;
}

.status-icon.healthy {
    background-color: #4CAF50;
}

.status-icon.unhealthy {
    background-color: var(--error-color);
}

.status-icon.unknown {
    background-color: var(--warning-color);
}

.status-text {
    color: var(--text-secondary);
}

.status-delay {
    color: var(--text-tertiary);
    font-size: var(--font-size-xs);
    margin-left: var(--spacing-xs);
}

/* ========================================
   主内容区
   ======================================== */

.main-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* ========================================
   输入区域
   ======================================== */

.input-section {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(255, 255, 255, 0.5);
    flex: 1;
    min-height: 250px;
    max-height: 60vh;
}

/* 输入方式切换 Tab */
.input-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: var(--spacing-sm);
}

.tab-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: var(--font-size-md);
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--border-radius-md);
    transition: all var(--transition-fast);
    position: relative;
}

.tab-btn svg {
    width: 20px;
    height: 20px;
}

.tab-btn:hover {
    color: var(--primary-color);
    background: var(--primary-light);
}

.tab-btn.active {
    color: var(--primary-color);
    background: var(--primary-light);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
    border-radius: 2px;
}

/* 输入面板 */
.input-panel {
    display: none;
}

.input-panel.active {
    display: flex;
    flex: 1;
    flex-direction: column;
}

/* 文字输入区域 */
.text-input-wrapper {
    position: relative;
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* 图片插入按钮 */
.image-insert-btn {
    position: absolute;
    bottom: var(--spacing-md);
    left: var(--spacing-md);
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-secondary);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    z-index: 1;
}

.image-insert-btn:hover {
    background: var(--primary-light);
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.image-insert-btn svg {
    width: 20px;
    height: 20px;
}

/* 输入区域 */
.input-area {
    width: 100%;
}

/* 图片预览区域 */
.image-previews {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.image-preview-item {
    position: relative;
    width: 120px;
    height: 120px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    overflow: hidden;
}

.image-preview-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.image-preview-item .remove-image {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 24px;
    height: 24px;
    background: rgba(0, 0, 0, 0.6);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    line-height: 1;
}

.image-preview-item .remove-image:hover {
    background: rgba(0, 0, 0, 0.8);
}

.text-input {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    font-size: var(--font-size-md);
    font-family: inherit;
    resize: vertical;
    min-height: 150px;
    flex: 1;
    transition: border-color var(--transition-fast);
    background: var(--bg-primary);
}

.text-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.text-input::placeholder {
    color: var(--text-tertiary);
}

.text-input-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--spacing-sm);
    padding: 0 var(--spacing-sm);
}

.char-count {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

.clear-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    border: none;
    background: transparent;
    color: var(--text-tertiary);
    font-size: var(--font-size-sm);
    cursor: pointer;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

.clear-btn svg {
    width: 16px;
    height: 16px;
}

.clear-btn:hover {
    color: var(--error-color);
    background: #fef2f2;
}

/* 图片输入区域 */
.image-upload-wrapper {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    flex: 1;
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-2xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    background: var(--bg-secondary);
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: var(--primary-light);
}

.upload-area.dragover {
    border-color: var(--primary-color);
    background: var(--primary-light);
    transform: scale(1.02);
}

.upload-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.upload-icon {
    width: 48px;
    height: 48px;
    color: var(--text-tertiary);
}

.upload-text {
    font-size: var(--font-size-lg);
    color: var(--text-primary);
    font-weight: 500;
}

.upload-hint {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

/* 图片预览 */
.image-preview-wrapper {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
}

.image-preview {
    max-width: 100%;
    max-height: 300px;
    object-fit: contain;
    border-radius: var(--border-radius-md);
}

.image-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

#image-size {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.remove-image-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    border: none;
    background: transparent;
    color: var(--error-color);
    font-size: var(--font-size-sm);
    cursor: pointer;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

.remove-image-btn svg {
    width: 16px;
    height: 16px;
}

.remove-image-btn:hover {
    background: #fef2f2;
}

/* 提交按钮 */
.submit-btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--border-radius-lg);
    background: linear-gradient(135deg, #1E40AF, #06B6D4);
    color: white;
    font-size: var(--font-size-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    flex: 1;
    max-width: 200px;
}

.submit-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.submit-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.submit-btn svg {
    width: 20px;
    height: 20px;
}

.btn-text,
.btn-loading {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.spinner {
    animation: spin 1s linear infinite;
}

/* 操作栏：模型选择和提交按钮 */
.action-bar {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.model-selector-section {
    flex: 1;
}

.model-selector-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.model-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    white-space: nowrap;
}

.model-select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background: white;
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: border-color var(--transition-fast);
}

.model-select:hover {
    border-color: var(--primary-color);
}

.model-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

/* ========================================
   步骤指示器
   ======================================== */

.progress-section {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(255, 255, 255, 0.5);
}

.progress-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.step-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.step-icon svg {
    width: 24px;
    height: 24px;
    color: var(--text-tertiary);
}

.step-label {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    font-weight: 500;
}

.step.active .step-icon {
    background: var(--primary-color);
}

.step.active .step-icon svg {
    color: white;
}

.step.active .step-label {
    color: var(--primary-color);
}

.step.completed .step-icon {
    background: var(--success-color);
}

.step.completed .step-icon svg {
    color: white;
}

.step-connector {
    width: 60px;
    height: 2px;
    background: var(--border-color);
    border-radius: 1px;
}

/* ========================================
   结果展示区域
   ======================================== */

.result-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    flex: 1;
    min-height: 400px;
}

.result-card {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(255, 255, 255, 0.5);
    overflow: hidden;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.card-header h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

.card-header h3 svg {
    width: 20px;
    height: 20px;
    color: var(--primary-color);
}

.toggle-btn {
    padding: var(--spacing-xs);
    border: none;
    background: transparent;
    cursor: pointer;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

.toggle-btn svg {
    width: 20px;
    height: 20px;
    color: var(--text-tertiary);
    transition: transform var(--transition-fast);
}

.toggle-btn:hover {
    background: var(--bg-tertiary);
}

.toggle-btn.collapsed svg {
    transform: rotate(-90deg);
}

.card-content {
    padding: var(--spacing-lg);
}

/* 题目识别结果 */
.recognized-text {
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-md);
    line-height: 1.8;
    color: var(--text-primary);
    white-space: pre-wrap;
    margin-bottom: var(--spacing-md);
}

.edit-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    cursor: pointer;
    border-radius: var(--border-radius-md);
    transition: all var(--transition-fast);
}

.edit-btn svg {
    width: 16px;
    height: 16px;
}

.edit-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* 题目解析结果 */
.parse-result {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.parse-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.parse-label {
    min-width: 80px;
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    font-weight: 500;
}

.parse-value {
    font-size: var(--font-size-md);
    color: var(--text-primary);
    font-weight: 500;
}

.parse-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.parse-tag {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--primary-light);
    color: var(--primary-color);
    font-size: var(--font-size-sm);
    border-radius: var(--border-radius-sm);
}

.difficulty {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-sm);
}

.difficulty.easy {
    background: #d1fae5;
    color: #065f46;
}

.difficulty.medium {
    background: #fef3c7;
    color: #92400e;
}

.difficulty.hard {
    background: #fee2e2;
    color: #991b1b;
}

/* 详细解答 */
.solution-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.solution-section h4 {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--primary-light);
}

.solution-thinking,
.solution-steps,
.solution-answer,
.solution-summary {
    font-size: var(--font-size-md);
    line-height: 1.8;
    color: var(--text-secondary);
}

.solution-step+.solution-step {
    margin-top: var(--spacing-md);
}

.solution-step-title {
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--text-primary);
}

.markdown-content p {
    margin: 0 0 var(--spacing-sm);
}

.markdown-content p:last-child {
    margin-bottom: 0;
}

.markdown-content ul,
.markdown-content ol {
    margin: 0 0 var(--spacing-sm);
    padding-left: 1.4em;
}

.markdown-content ul.task-list {
    list-style: none;
    padding-left: 0;
}

.markdown-content li+li {
    margin-top: var(--spacing-xs);
}

.markdown-content li.task-list-item {
    display: flex;
    gap: 0.45em;
    align-items: flex-start;
}

.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4,
.markdown-content h5,
.markdown-content h6 {
    margin: 0 0 var(--spacing-sm);
    color: var(--text-primary);
    line-height: 1.4;
}

.markdown-content code {
    padding: 0.1em 0.35em;
    border-radius: var(--border-radius-sm);
    background: var(--bg-secondary);
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    font-size: 0.92em;
}

.markdown-content pre {
    margin: 0 0 var(--spacing-sm);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    background: var(--bg-secondary);
    overflow-x: auto;
}

.markdown-content pre code {
    padding: 0;
    border-radius: 0;
    background: transparent;
}

.markdown-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 0 0 var(--spacing-sm);
    display: block;
    overflow-x: auto;
}

.markdown-content th,
.markdown-content td {
    border: 1px solid var(--border-color);
    padding: 0.45rem 0.6rem;
    text-align: left;
    vertical-align: top;
    white-space: nowrap;
}

.markdown-content th {
    background: var(--bg-secondary);
    font-weight: 600;
    color: var(--text-primary);
}

.markdown-content hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: var(--spacing-md) 0;
}

.markdown-content blockquote {
    margin: 0 0 var(--spacing-sm);
    padding-left: var(--spacing-md);
    border-left: 3px solid var(--border-color);
    color: var(--text-tertiary);
}

.markdown-content a {
    color: var(--primary-color);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.markdown-content .katex-display {
    margin: 0 0 var(--spacing-sm);
    overflow-x: auto;
    overflow-y: hidden;
    padding-bottom: 0.1rem;
}

.markdown-content .katex {
    line-height: 1.5;
}

.solution-answer {
    padding: var(--spacing-md);
    background: var(--primary-light);
    border-radius: var(--border-radius-md);
    border-left: 4px solid var(--primary-color);
    font-weight: 600;
    color: var(--primary-color);
}

/* ========================================
   历史记录
   ======================================== */

.history-btn {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius-lg);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: var(--font-size-md);
    font-weight: 500;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-fast);
    z-index: 100;
    transform: translateY(-10px);
    /* 向上移动一点，避免挡住按钮 */
}

.history-btn svg {
    width: 20px;
    height: 20px;
}

.history-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.history-sidebar {
    position: fixed;
    top: 0;
    right: -400px;
    width: 400px;
    height: 100vh;
    background: var(--bg-primary);
    box-shadow: var(--shadow-xl);
    z-index: 200;
    transition: right var(--transition-normal);
    display: flex;
    flex-direction: column;
}

.history-sidebar.open {
    right: 0;
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.history-header h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
}

.close-history {
    padding: var(--spacing-sm);
    border: none;
    background: transparent;
    cursor: pointer;
    border-radius: var(--border-radius-md);
    transition: all var(--transition-fast);
}

.close-history svg {
    width: 24px;
    height: 24px;
    color: var(--text-tertiary);
}

.close-history:hover {
    background: var(--bg-secondary);
}

.history-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
}

.history-item {
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    margin-bottom: var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.history-item:hover {
    border-color: var(--primary-color);
    background: var(--primary-light);
}

.history-item-title {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.history-item-time {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

.overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 150;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

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

/* ========================================
   响应式设计
   ======================================== */

@media (max-width: 768px) {
    .app-container {
        padding: var(--spacing-md);
        height: 100vh;
    }

    .header {
        margin-bottom: var(--spacing-lg);
        padding: var(--spacing-lg) 0;
    }

    .logo-icon {
        width: 32px;
        height: 32px;
    }

    .header h1 {
        font-size: var(--font-size-xl);
    }

    .input-tabs {
        gap: var(--spacing-xs);
    }

    .tab-btn {
        padding: var(--spacing-sm);
        font-size: var(--font-size-sm);
    }

    .tab-btn svg {
        width: 16px;
        height: 16px;
    }

    .input-section {
        padding: var(--spacing-md);
    }

    .upload-area {
        padding: var(--spacing-xl);
    }

    .upload-icon {
        width: 36px;
        height: 36px;
    }

    .progress-steps {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .step-connector {
        width: 2px;
        height: 20px;
    }

    .history-sidebar {
        width: 100%;
        right: -100%;
    }

    .history-btn {
        bottom: var(--spacing-md);
        right: var(--spacing-md);
        padding: var(--spacing-sm) var(--spacing-md);
        transform: translateY(-5px);
        /* 移动端也向上移动一点 */
    }

    .main-content {
        gap: var(--spacing-lg);
        padding-bottom: 80px;
        /* 移动端调整底部 padding */
    }

    .action-bar {
        flex-direction: column;
    }

    .model-selector-section {
        width: 100%;
    }

    .model-selector-wrapper {
        width: 100%;
        justify-content: space-between;
    }

    .model-select {
        flex: 1;
    }

    .submit-btn {
        width: 100%;
        max-width: none;
    }

    .input-section {
        min-height: 200px;
        max-height: 50vh;
        padding: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .parse-item {
        flex-direction: column;
        gap: var(--spacing-xs);
    }

    .parse-label {
        min-width: auto;
    }
}

/* ========================================
   动画效果
   ======================================== */

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-card {
    animation: fadeIn 0.3s ease;
}

/* ========================================
   滚动条样式
   ======================================== */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-400);
}

/* ========================================
   主页样式
   ======================================== */

.home-container {
    min-height: 100vh;
    display: flex;
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--gray-100) 100%);
}

/* 左侧欢迎区域 */
.home-left {
    flex: 1;
    background: linear-gradient(135deg, #1E40AF 0%, #0F172A 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 var(--spacing-2xl);
    position: relative;
    overflow: hidden;
}

.home-left::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 30%, rgba(6, 182, 212, 0.2) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(6, 182, 212, 0.15) 0%, transparent 50%);
    z-index: 1;
}

.welcome-section {
    max-width: 500px;
    z-index: 2;
}

.welcome-section .logo {
    margin-bottom: var(--spacing-lg);
}

.welcome-section .logo-icon {
    color: white;
}

.welcome-section h1 {
    background: none;
    -webkit-background-clip: text;
    -webkit-text-fill-color: white;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.welcome-subtitle {
    font-size: var(--font-size-lg);
    opacity: 0.9;
    margin-bottom: var(--spacing-md);
}

.welcome-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--spacing-lg);
}

.welcome-description {
    font-size: var(--font-size-md);
    opacity: 0.9;
    line-height: 1.6;
    margin-bottom: var(--spacing-xl);
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.feature-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: var(--font-size-md);
    font-weight: 500;
}

.feature-icon {
    width: 24px;
    height: 24px;
    color: white;
    opacity: 0.9;
}

/* 右侧登录/注册区域 */
.home-right {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    background: var(--bg-primary);
}

.home-right .auth-card {
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow-lg);
}

.home-right .auth-header {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.home-right .auth-header h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.home-right .auth-header p {
    color: var(--text-secondary);
    font-size: var(--font-size-md);
}

/* 登录/注册页面样式 */

.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--gray-100) 100%);
    padding: 20px;
}

.auth-card {
    background: var(--bg-primary);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 420px;
    overflow: hidden;
}

.auth-header {
    text-align: center;
    padding: 40px 30px 20px;
    background: linear-gradient(135deg, #1E40AF 0%, #0F172A 100%);
    color: white;
}

.auth-header h1 {
    font-size: 28px;
    margin-bottom: 8px;
}

.auth-header p {
    opacity: 0.9;
    font-size: 14px;
}

.auth-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
}

.auth-tabs .tab-btn {
    flex: 1;
    padding: 16px;
    border: none;
    background: none;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all 0.2s;
    border-bottom: 2px solid transparent;
}

.auth-tabs .tab-btn:hover {
    color: var(--text-primary);
    background: var(--gray-50);
}

.auth-tabs .tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.auth-form {
    display: none;
    padding: 30px;
}

.auth-form.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

.auth-form .form-group {
    margin-bottom: 20px;
}

.auth-form .form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-primary);
}

.auth-form .form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    font-size: 15px;
    transition: border-color 0.2s, box-shadow 0.2s;
    box-sizing: border-box;
}

.auth-form .form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.auth-form .form-group input::placeholder {
    color: var(--text-tertiary);
}

.code-input-group {
    display: flex;
    gap: 10px;
}

.code-input-group input {
    flex: 1;
}

.code-input-group button {
    white-space: nowrap;
    padding: 12px 16px;
}

.auth-footer {
    padding: 20px 30px 30px;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.back-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

.back-link:hover {
    color: var(--primary-color);
}

/* Toast 提示 */
.toast {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    padding: 12px 24px;
    border-radius: var(--border-radius-md);
    font-size: 14px;
    z-index: 10000;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

.toast-success {
    background: var(--success-color);
    color: white;
}

.toast-error {
    background: var(--error-color);
    color: white;
}

.toast-info {
    background: var(--info-color);
    color: white;
}

/* ========================================
   用户信息展示
   ======================================== */

.user-info {
    position: fixed;
    top: 16px;
    right: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 1000;
    background: var(--bg-primary);
    padding: 8px 16px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, #1E40AF 0%, #06B6D4 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
}

.user-name {
    font-weight: 500;
    color: var(--text-primary);
}

.user-logout-btn {
    padding: 8px 16px;
    background: none;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-secondary);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
}

.user-logout-btn:hover {
    background: var(--gray-100);
    border-color: var(--gray-300);
    color: var(--text-primary);
}

/* 登录/注册按钮 */
.auth-btns {
    display: flex;
    gap: 10px;
}

.auth-btns .btn {
    padding: 8px 20px;
    font-size: 14px;
}

/* 企业级深蓝按钮 - 登录/注册表单 */
.auth-form .btn-primary {
    position: relative;
    width: 100%;
    padding: 14px 28px;
    border: 2px solid transparent;
    border-radius: 8px;
    background: linear-gradient(135deg, #1E40AF, #06B6D4);
    color: white;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 0 20px rgba(30, 64, 175, 0.3);
}

.auth-form .btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg,
            transparent,
            rgba(255, 255, 255, 0.2),
            transparent);
    transition: left 0.5s ease;
}

.auth-form .btn-primary::after {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(135deg, #06b6d4, #10b981, #06b6d4);
    border-radius: 10px;
    z-index: -1;
    filter: blur(15px);
    opacity: 0.6;
    transition: opacity 0.3s ease;
}

.auth-form .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow:
        0 0 30px rgba(6, 182, 212, 0.5),
        0 0 60px rgba(16, 185, 129, 0.3);
    animation: cyberpunkHover 0.6s ease-in-out infinite alternate;
}

.auth-form .btn-primary:hover::before {
    left: 100%;
}

.auth-form .btn-primary:hover::after {
    opacity: 0.8;
}

.auth-form .btn-primary:active {
    transform: translateY(0) scale(0.98);
    box-shadow: 0 0 15px rgba(6, 182, 212, 0.4);
}

.auth-form .btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    animation: none;
    box-shadow: 0 0 10px rgba(6, 182, 212, 0.2);
}

.auth-form .btn-primary:disabled::after {
    opacity: 0.3;
}

.auth-form .btn-primary .btn-text,
.auth-form .btn-primary .btn-loading {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.auth-form .btn-primary .btn-loading {
    color: rgba(255, 255, 255, 0.9);
}

@keyframes cyberpunkHover {
    0% {
        box-shadow:
            0 0 20px rgba(6, 182, 212, 0.4),
            0 0 40px rgba(16, 185, 129, 0.2);
    }

    100% {
        box-shadow:
            0 0 30px rgba(6, 182, 212, 0.6),
            0 0 50px rgba(16, 185, 129, 0.4);
    }
}

@keyframes cyberpunkGlow {

    0%,
    100% {
        filter: drop-shadow(0 0 5px rgba(6, 182, 212, 0.8));
    }

    50% {
        filter: drop-shadow(0 0 15px rgba(16, 185, 129, 0.8));
    }
}

.auth-form .btn-primary .btn-text svg {
    animation: cyberpunkGlow 2s ease-in-out infinite;
}

@media (max-width: 768px) {
    .auth-card {
        max-width: 100%;
    }

    .auth-header {
        padding: 30px 20px 15px;
    }

    .auth-header h1 {
        font-size: 24px;
    }

    .auth-form {
        padding: 20px;
    }
}

/* 主页响应式样式 */
@media (max-width: 1024px) {
    .home-container {
        flex-direction: column;
    }

    .home-left {
        padding: var(--spacing-2xl);
        min-height: 60vh;
    }

    .home-right {
        padding: var(--spacing-xl);
        min-height: 40vh;
    }

    .welcome-section {
        text-align: center;
    }

    .feature-item {
        justify-content: center;
    }

    .home-right .auth-card {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .home-left {
        padding: var(--spacing-xl);
        min-height: 50vh;
    }

    .home-right {
        padding: var(--spacing-lg);
    }

    .welcome-title {
        font-size: var(--font-size-xl);
    }

    .welcome-description {
        font-size: var(--font-size-sm);
    }

    .feature-item {
        font-size: var(--font-size-sm);
    }
}

/* ========================================
   企业级对话界面组件
   ======================================== */

/* 对话消息容器 */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* 消息基础样式 */
.message {
    display: flex;
    gap: var(--spacing-md);
    max-width: 85%;
    animation: messageSlideIn 0.3s ease-out;
}

@keyframes messageSlideIn {
    from {
        opacity: 0;
        transform: translateY(12px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 用户消息 - 右侧对齐 */
.message-user {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.message-user .message-content {
    background: var(--bg-primary);
    border: 1px solid var(--slate-200);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md);
    position: relative;
    border-left: 4px solid var(--primary-color);
    box-shadow: var(--shadow-sm);
}

/* AI消息 - 左侧对齐 */
.message-ai {
    align-self: flex-start;
}

.message-ai .message-content {
    background: var(--slate-50);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
}

/* AI头像 */
.ai-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, #1E40AF, #06B6D4);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: var(--shadow-md);
}

.ai-avatar svg {
    width: 22px;
    height: 22px;
    color: white;
}

/* 系统消息 - 居中 */
.message-system {
    align-self: center;
    max-width: 70%;
}

.message-system .message-content {
    background: var(--slate-200);
    border-radius: var(--border-radius-full);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    text-align: center;
}

/* 打字机光标效果 */
.typing-cursor {
    display: inline-block;
    width: 2px;
    height: 1.1em;
    background: var(--primary-color);
    margin-left: 2px;
    animation: cursorBlink 1s infinite;
}

@keyframes cursorBlink {

    0%,
    50% {
        opacity: 1;
    }

    51%,
    100% {
        opacity: 0;
    }
}

/* 代码块样式 */
.message-content pre {
    background: var(--slate-800);
    color: #E2E8F0;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    overflow-x: auto;
    position: relative;
    margin: var(--spacing-sm) 0;
}

.message-content pre code {
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', monospace;
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.copy-code-btn {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--slate-700);
    border: none;
    border-radius: var(--border-radius-sm);
    color: var(--slate-300);
    font-size: var(--font-size-xs);
    cursor: pointer;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.message-content pre:hover .copy-code-btn {
    opacity: 1;
}

/* 复合输入区 */
.chat-input-area {
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border-top: 1px solid var(--slate-200);
}

/* 图片预览条 */
.image-preview-bar {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    overflow-x: auto;
}

.image-preview-bar:empty {
    display: none;
}

.preview-thumbnail {
    position: relative;
    width: 64px;
    height: 64px;
    border-radius: var(--border-radius-md);
    overflow: hidden;
    flex-shrink: 0;
    border: 2px solid var(--slate-200);
    transition: border-color var(--transition-fast);
}

.preview-thumbnail:hover {
    border-color: var(--primary-color);
}

.preview-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.preview-thumbnail .remove-btn {
    position: absolute;
    top: -6px;
    right: -6px;
    width: 20px;
    height: 20px;
    background: var(--error-color);
    border: 2px solid white;
    border-radius: 50%;
    color: white;
    font-size: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.preview-thumbnail:hover .remove-btn {
    opacity: 1;
}

/* 输入框容器 */
.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-sm);
    background: var(--slate-50);
    border: 2px solid var(--slate-200);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-sm);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input-wrapper:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
}

.input-wrapper textarea {
    flex: 1;
    border: none;
    background: transparent;
    resize: none;
    font-family: inherit;
    font-size: var(--font-size-md);
    line-height: 1.5;
    min-height: 24px;
    max-height: 160px;
    padding: var(--spacing-sm);
    color: var(--text-primary);
}

.input-wrapper textarea:focus {
    outline: none;
}

.input-wrapper textarea::placeholder {
    color: var(--text-tertiary);
}

/* 附件按钮 */
.btn-attach {
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    border-radius: var(--border-radius-md);
    color: var(--text-tertiary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.btn-attach:hover {
    background: var(--slate-200);
    color: var(--primary-color);
}

/* 发送按钮 */
.btn-send {
    width: 40px;
    height: 40px;
    border: none;
    background: var(--slate-300);
    border-radius: var(--border-radius-md);
    color: white;
    cursor: not-allowed;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.btn-send.active {
    background: linear-gradient(135deg, #1E40AF, #06B6D4);
    cursor: pointer;
}

.btn-send.active:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

/* 快捷操作栏 */
.quick-actions {
    display: flex;
    gap: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    margin-top: var(--spacing-sm);
    border-top: 1px solid var(--slate-100);
}

.quick-action-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: transparent;
    border: 1px solid var(--slate-200);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.quick-action-btn:hover {
    background: var(--primary-light);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* 空状态欢迎页 */
.welcome-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    text-align: center;
}

.welcome-empty-state h2 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.welcome-empty-state p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

/* 推荐问题卡片网格 */
.suggestion-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    max-width: 700px;
    width: 100%;
}

.suggestion-card {
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border: 1px solid var(--slate-200);
    border-radius: var(--border-radius-lg);
    cursor: pointer;
    text-align: left;
    transition: all var(--transition-fast);
}

.suggestion-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.suggestion-card h4 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.suggestion-card p {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
}

/* Toast 通知组件增强 */
.toast-container {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    animation: toastSlideIn 0.3s ease-out;
    min-width: 280px;
}

@keyframes toastSlideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.toast-item.success {
    border-left: 4px solid var(--success-color);
}

.toast-item.error {
    border-left: 4px solid var(--error-color);
}

.toast-item.warning {
    border-left: 4px solid var(--warning-color);
}

.toast-item.info {
    border-left: 4px solid var(--info-color);
}

.toast-item.slide-out {
    animation: toastSlideOut 0.3s ease-in forwards;
}

@keyframes toastSlideOut {
    from {
        opacity: 1;
        transform: translateX(0);
    }

    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

/* ========================================
   加载遮罩
   ======================================== */

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.loading-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-xl);
    background: var(--bg-primary);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-color);
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--slate-200);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loading-content p {
    font-size: var(--font-size-md);
    color: var(--text-secondary);
    font-weight: 500;
}

/* ========================================
   无障碍样式
   ======================================== */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* 焦点样式 */
button:focus,
input:focus,
textarea:focus,
select:focus,
a:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* 深色模式支持 */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: var(--slate-900);
        --bg-secondary: var(--slate-800);
        --bg-tertiary: var(--slate-700);
        --text-primary: var(--slate-50);
        --text-secondary: var(--slate-300);
        --text-tertiary: var(--slate-500);
        --border-color: var(--slate-700);
    }

    body {
        background:
            radial-gradient(circle at 10% 20%, rgba(30, 64, 175, 0.15) 0%, transparent 25%),
            radial-gradient(circle at 90% 80%, rgba(6, 182, 212, 0.15) 0%, transparent 25%),
            var(--slate-900);
    }

    .message-user .message-content {
        background: var(--slate-800);
        border-color: var(--slate-700);
    }

    .message-ai .message-content {
        background: var(--slate-800);
    }

    .input-wrapper {
        background: var(--slate-800);
        border-color: var(--slate-700);
    }

    .nav-menu {
        background: rgba(30, 41, 59, 0.85);
        /* rgba for var(--slate-800) */
        border-color: var(--border-color);
    }

    .nav-item:hover {
        background: rgba(255, 255, 255, 0.1);
    }

    .nav-item.active {
        background: rgba(59, 130, 246, 0.2);
        border-color: rgba(59, 130, 246, 0.3);
        color: #60a5fa;
    }

    .nav-item.active:hover {
        background: rgba(59, 130, 246, 0.3);
    }
}