:root {
    --bg-color: #ffffff;
    --sidebar-bg: #ffffff;
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --accent-color: #000000;
    --accent-hover: #1d1d1f;
    --border-color: rgba(0, 0, 0, 0.1);
    --input-bg: #ffffff;
    --user-msg-bg: #f5f5f7;
    --ai-msg-bg: transparent;
    --card-bg: #ffffff;
    --sidebar-hover: #f5f5f7;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-family);
    overflow: hidden;
}

.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
}

/* 侧边栏 */
.sidebar {
    width: 300px;
    background-color: var(--sidebar-bg);
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border-color);
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1), transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    flex-shrink: 0;
    position: relative;
}

.sidebar.collapsed {
    width: 60px;
    border-right: 1px solid var(--border-color);
}

/* 收起时：彻底隐藏 Logo、新建对话按钮、历史列表 */
.sidebar.collapsed .logo,
.sidebar.collapsed .new-chat-btn,
.sidebar.collapsed .history-list {
    display: none !important;
}

.sidebar.collapsed .sidebar-header {
    padding: 16px 0;
    display: flex;
    justify-content: center;
    /* 按钮居中显示 */
}

.sidebar.collapsed .sidebar-toggle-btn {
    margin: 0;
}

.sidebar-header {
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.sidebar-header-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.4rem;
    font-weight: 800;
    color: #000000;
    letter-spacing: 1px;
}

.logo i {
    background: #000000;
    color: #ffffff;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 0.9rem;
}

.sidebar-toggle-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.1rem;
    cursor: pointer;
    padding: 6px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.sidebar-toggle-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.new-chat-btn {
    width: 100%;
    padding: 12px;
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: background 0.2s;
}

.new-chat-btn:hover {
    background: rgba(255, 255, 255, 0.05);
}

.history-list {
    flex: 1;
    overflow-y: auto;
    padding: 0 12px;
}

.history-group {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: 24px 0 12px 4px;
    text-transform: uppercase;
    font-weight: 500;
}

.history-item {
    padding: 12px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    color: var(--text-secondary);
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 4px;
    position: relative;
}

.history-item:hover {
    background-color: var(--sidebar-hover);
    color: var(--text-primary);
}

.history-item.active {
    background-color: rgba(56, 189, 248, 0.1);
    color: var(--accent-color);
    font-weight: 500;
}

.history-item.active .history-item-title {
    color: var(--accent-color);
}

.history-item.active i {
    color: var(--accent-color);
}

.history-item .delete-history-btn {
    opacity: 0;
    transition: all 0.2s;
    color: var(--text-secondary);
    padding: 10px;
    margin: -10px;
    border-radius: 6px;
    font-size: 0.8rem;
    position: relative;
    z-index: 10;
    cursor: pointer;
}

.history-item:hover .delete-history-btn {
    opacity: 0.6;
}

.history-item .delete-history-btn:hover {
    opacity: 1 !important;
    color: #ff4d4f;
    background-color: rgba(255, 77, 79, 0.1);
}

.user-avatar-wrapper {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: #e5e7eb;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    flex-shrink: 0;
    border: 1px solid var(--border-color);
    position: relative;
    cursor: pointer;
    transition: all 0.3s ease;
}

.user-avatar-wrapper:hover {
    filter: brightness(0.9);
    border-color: var(--accent-color);
}

.user-avatar-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 顶部导航栏 */
.main-header {
    height: 70px;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.85);
    /* 稍微增加不透明度 */
    backdrop-filter: blur(20px);
    /* 增强毛玻璃感 */
    border-bottom: 1px solid var(--border-color);
    pointer-events: none;
}

.main-header>* {
    pointer-events: auto;
}

.header-left-actions {
    display: none;
    position: fixed;
    top: 16px;
    left: 16px;
    z-index: 1001;
    gap: 12px;
    background: var(--sidebar-bg);
    padding: 6px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

/* 桌面端：让标题区域显示在左上角，且不遮挡内容 */
@media (min-width: 769px) {
    .header-left-actions {
        display: flex;
        position: absolute;
        top: 15px;
        left: 15px;
        background: transparent;
        border: none;
        box-shadow: none;
        padding: 0;
        z-index: 101;
        pointer-events: auto;
        align-items: center;
    }

    .header-title-area {
        display: flex;
        flex-direction: column;
        margin-left: 0;
        max-width: 400px;
    }

    #headerTitle {
        font-size: 0.95rem;
        font-weight: 600;
        color: var(--text-primary);
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    #headerSubtitle {
        font-size: 0.75rem;
        color: var(--text-secondary);
        display: flex;
        align-items: center;
        gap: 4px;
    }
}

.sidebar.collapsed+.main-content .header-left-actions {
    display: flex;
}

.menu-toggle {
    display: none;
    /* 电脑端彻底隐藏 */
}

.floating-new-chat-btn {
    display: flex;
}

.menu-toggle,
.floating-new-chat-btn {
    width: 34px;
    height: 34px;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1rem;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s;
}

.menu-toggle:hover,
.floating-new-chat-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
}

.user-auth-area {
    position: relative;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 6px 12px;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.user-info:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--accent-color);
}

.header-logout-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1rem;
    padding: 4px 8px;
    border-left: 1px solid var(--border-color);
    margin-left: 8px;
    transition: color 0.2s;
}

.header-logout-btn:hover {
    color: #ff4d4f;
}

/* 主内容区 */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    width: 100%;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 当侧边栏收起时，内容占满全屏 */
.sidebar.collapsed+.main-content {
    width: 100%;
}

.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 90px 20px 150px 20px;
    scroll-behavior: smooth;
}

.welcome-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    padding-bottom: 100px;
}

.welcome-screen h1 {
    font-size: 3rem;
    margin-bottom: 12px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -1px;
}

.welcome-screen p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.quick-suggestions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    max-width: 600px;
}

.suggestion-chip {
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
}

.suggestion-chip:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--accent-color);
    color: var(--text-primary);
    transform: translateY(-2px);
}

.mode-selector {
    display: flex;
    gap: 10px;
    background: var(--input-bg);
    padding: 4px;
    border-radius: 10px;
}

.mode-btn {
    padding: 8px 24px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.mode-btn.active {
    background: var(--border-color);
    color: var(--text-primary);
}

/* 消息样式 */
.message {
    display: flex;
    gap: 20px;
    margin: 0 auto 32px auto;
    width: 100%;
    max-width: 900px;
    animation: fadeIn 0.3s ease;
}

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

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

.message.user {
    justify-content: flex-end;
}

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--accent-color);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.message-content {
    max-width: 85%;
    line-height: 1.7;
    font-size: 1.05rem;
}

.message.user .message-content {
    background: var(--user-msg-bg);
    padding: 12px 16px;
    border-radius: 12px;
}

/* 产品卡片网格 */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 12px;
    margin-top: 16px;
}

.product-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    transition: transform 0.2s, border-color 0.2s;
}

.product-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-color);
}

.product-card h3 {
    font-size: 0.95rem;
    margin-bottom: 8px;
    color: var(--accent-color);
}

.product-card .tag {
    font-size: 0.75rem;
    background: rgba(77, 107, 254, 0.1);
    color: var(--accent-color);
    padding: 2px 8px;
    border-radius: 4px;
    margin-right: 4px;
}

.product-card .price {
    margin-top: 10px;
    font-weight: bold;
    color: #ff9f43;
}

/* 输入框 */
.input-area-container {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 20px;
    background: linear-gradient(transparent, var(--bg-color) 40%);
}

.input-box-wrapper {
    max-width: 840px;
    margin: 0 auto;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    /* More rounded like DeepSeek */
    padding: 16px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.input-box-wrapper:focus-within {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.1), 0 10px 40px rgba(0, 0, 0, 0.5);
}

.input-actions-top {
    display: flex;
    gap: 8px;
    margin-bottom: 10px;
}

.action-chip {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
}

.action-chip.active {
    background: rgba(77, 107, 254, 0.15);
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.input-box {
    display: flex;
    align-items: flex-end;
    gap: 10px;
}

#userInput {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1rem;
    resize: none;
    outline: none;
    padding: 8px 4px;
    max-height: 200px;
}

.input-actions-bottom {
    display: flex;
    gap: 12px;
    align-items: center;
}

.tool-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.1rem;
}

.send-btn {
    width: 32px;
    height: 32px;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.2s;
}

.send-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.stop-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(255, 77, 79, 0.1);
    color: #ff4d4f;
    border: 1px solid rgba(255, 77, 79, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}

.stop-btn:hover {
    background: #ff4d4f;
    color: white;
}

.disclaimer {
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 12px;
}

/* 思考状态动画 */
.thinking-container {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 20px;
    max-width: 400px;
}

.thinking-header {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-primary);
    font-weight: 500;
    margin-bottom: 12px;
    font-size: 0.9rem;
}

.thinking-steps {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-left: 18px;
}

.step {
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
    opacity: 0.5;
    transition: all 0.3s;
}

.step.active {
    opacity: 1;
    color: var(--accent-color);
}

.step i {
    width: 14px;
}

.dot-flashing {
    position: relative;
    width: 6px;
    height: 6px;
    border-radius: 5px;
    background-color: var(--accent-color);
    color: var(--accent-color);
    animation: dotFlashing 1s infinite linear alternate;
    animation-delay: .5s;
}

/* 模态框样式 */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-card {
    background: var(--sidebar-bg);
    border: 1px solid var(--border-color);
    width: 380px;
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.close-modal {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
}

.input-group {
    margin-bottom: 16px;
}

.input-group label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.input-group input {
    width: 100%;
    padding: 10px;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    outline: none;
}

.auth-btn {
    width: 100%;
    padding: 12px;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 8px;
    margin-top: 10px;
    cursor: pointer;
    font-weight: 600;
}

.auth-switch {
    text-align: center;
    margin-top: 16px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.auth-switch a {
    color: var(--accent-color);
    text-decoration: none;
}

/* 验证码样式 */
.captcha-wrapper {
    display: flex;
    gap: 10px;
    align-items: center;
}

.captcha-code {
    background: linear-gradient(135deg, var(--accent-color), #8e44ad);
    color: white;
    padding: 8px 12px;
    border-radius: 8px;
    font-weight: bold;
    font-style: italic;
    letter-spacing: 4px;
    user-select: none;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(77, 107, 254, 0.3);
    min-width: 80px;
    text-align: center;
}

.captcha-code:active {
    transform: scale(0.95);
}

/* 徽章样式 */
.badge {
    font-size: 0.7rem;
    padding: 2px 6px;
    border-radius: 4px;
    text-transform: uppercase;
    font-weight: 800;
}

.ai-badge {
    background: rgba(77, 107, 254, 0.2);
    color: var(--accent-color);
    border: 1px solid var(--accent-color);
}

.mock-badge {
    background: rgba(158, 161, 167, 0.2);
    color: var(--text-secondary);
    border: 1px solid var(--text-secondary);
}

/* 思维链样式 */
.thought-process {
    background: rgba(255, 159, 67, 0.05);
    border: 1px solid rgba(255, 159, 67, 0.2);
    border-radius: 12px;
    margin-bottom: 20px;
    overflow: hidden;
}

.thought-process summary {
    padding: 12px 16px;
    cursor: pointer;
    font-size: 0.85rem;
    color: #ff9f43;
    font-weight: 600;
    user-select: none;
    display: flex;
    align-items: center;
    gap: 8px;
}

.thought-process summary:hover {
    background: rgba(255, 159, 67, 0.1);
}

.thought-content {
    padding: 12px 16px;
    border-top: 1px solid rgba(255, 159, 67, 0.1);
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.thought-content ul {
    list-style: none;
    padding: 0;
}

.thought-content li {
    margin-bottom: 6px;
    display: flex;
    gap: 8px;
}

.thought-content li::before {
    content: "•";
    color: #ff9f43;
}

.section-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
    border-left: 3px solid var(--accent-color);
    padding-left: 12px;
}

.source-links {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding-left: 15px;
}

.source-links a {
    color: var(--accent-color);
    text-decoration: none;
    font-size: 0.9rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 100%;
}

.source-links a:hover {
    text-decoration: underline;
}

.product-details {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 8px;
    overflow: hidden;
}

.product-details summary {
    padding: 12px 16px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
    transition: background 0.2s;
    user-select: none;
}

.product-details summary:hover {
    background: rgba(255, 255, 255, 0.03);
}

.details-content {
    padding: 16px;
    border-top: 1px solid var(--border-color);
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.details-content p {
    margin-bottom: 8px;
}

.details-content ul {
    padding-left: 20px;
}

.summary-text {
    font-size: 0.95rem;
    line-height: 1.8;
    color: var(--text-primary);
    padding-left: 15px;
}

.summary-text p {
    margin-bottom: 12px;
}

/* 产品网格与卡片增强 */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 15px;
    margin-bottom: 25px;
}

.product-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    position: relative;
}

.product-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-color);
    background: rgba(255, 255, 255, 0.05);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-brand {
    font-size: 0.85rem;
    color: var(--accent-color);
    margin-bottom: 15px;
    font-weight: 500;
}

.card-params {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 15px;
}

.card-param {
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: flex;
    justify-content: space-between;
}

.card-price {
    font-size: 1.1rem;
    font-weight: bold;
    color: #ff9f43;
    margin-top: auto;
    border-top: 1px solid var(--border-color);
    padding-top: 12px;
}

/* Sidebar Overlay for Mobile */
.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 999;
    display: none;
    backdrop-filter: blur(4px);
    animation: fadeIn 0.3s ease;
}

/* 响应式媒体查询 */
@media (max-width: 768px) {
    .menu-toggle {
        display: flex !important;
        position: fixed;
        top: 15px;
        left: 15px;
        z-index: 1100;
        background: #000000 !important;
        color: #ffffff !important;
        width: 40px;
        height: 40px;
        border-radius: 50%;
        justify-content: center;
        align-items: center;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    }

    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        z-index: 1000;
        width: 85%;
        max-width: 320px;
        transform: translateX(-100%);
        box-shadow: none;
    }

    .sidebar.active {
        transform: translateX(0);
        box-shadow: 20px 0 50px rgba(0, 0, 0, 0.6);
    }

    /* 核心修复：确保移动端侧边栏内容无论如何都显示 */
    .sidebar.collapsed .logo,
    .sidebar.collapsed .new-chat-btn,
    .sidebar.collapsed .history-list {
        display: flex !important;
        opacity: 1 !important;
        pointer-events: auto !important;
    }

    .sidebar.active>* {
        opacity: 1;
    }

    .main-content {
        max-width: 100%;
        padding-top: 60px;
    }

    .main-header {
        padding: 0 16px;
        background: rgba(255, 255, 255, 0.85);
        backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--border-color);
        justify-content: space-between;
        /* 仅在手机端开启两端对齐 */
    }

    .mobile-only-version {
        display: block !important;
        font-size: 10px;
        color: #ccc;
        padding: 10px;
        text-align: center;
    }

    .chat-container {
        padding: 20px 16px 180px 16px;
    }

    .welcome-screen h1 {
        font-size: 1.8rem;
        line-height: 1.3;
        margin-bottom: 16px;
    }

    .message {
        gap: 12px;
        margin-bottom: 28px;
    }

    .message-content {
        max-width: 100%;
        /* Full width on mobile for AI responses */
        font-size: 1rem;
        line-height: 1.7;
    }

    .message.user .message-content {
        max-width: 85%;
    }

    .input-area-container {
        padding: 16px;
        background: linear-gradient(transparent, var(--bg-color) 20%);
    }

    .input-box-wrapper {
        border-radius: 24px;
        padding: 12px 16px;
    }

    .product-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

/* Toast 提示样式 */
.toast-container {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2000;
}

.toast {
    background: #1d1d1f;
    /* 使用深色背景确保对比度 */
    color: #ffffff;
    /* 强制使用白色文字 */
    padding: 10px 20px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    margin-bottom: 10px;
    font-size: 0.9rem;
    animation: toastIn 0.3s cubic-bezier(0.18, 0.89, 0.32, 1.28), toastOut 0.3s 2s forwards;
    display: flex;
    align-items: center;
    gap: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

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

@keyframes toastOut {
    from {
        opacity: 1;
        transform: translateY(0);
    }

    to {
        opacity: 0;
        transform: translateY(-20px);
    }
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-5px);
    }

    75% {
        transform: translateX(5px);
    }
}

/* ============================================================
   PDF 导出按钮与用户界面增强 (新增，不影响原有样式)
   ============================================================ */

.pdf-export-container {
    display: flex;
    justify-content: flex-end;
    margin-top: 15px;
    padding-right: 15px;
}

.download-pdf-btn {
    background: linear-gradient(135deg, #2563eb, #1e40af);
    color: white !important;
    border: none;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.download-pdf-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(37, 99, 235, 0.3);
    background: linear-gradient(135deg, #1d4ed8, #1e3a8a);
}

/* 登录/注册模态框美化增强 */
.modal-card {
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.95) !important;
    backdrop-filter: blur(20px);
}

.auth-btn {
    background: linear-gradient(135deg, #000000, #333333) !important;
    transition: all 0.3s ease;
}

.auth-btn:hover {
    transform: scale(1.02);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}
/* ȫ�ֽ����ָв��� */
button, .sidebar-toggle-btn, .new-chat-btn, .upgrade-btn, .auth-btn, .history-item { cursor: pointer !important; transition: opacity 0.2s ease; }
button:active { transform: scale(0.98); }

/* ֧����ť�鶯��ǿ */
.auth-btn { transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important; box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06); }
.auth-btn:hover { transform: translateY(-2px); box-shadow: 0 10px 15px -3px rgba(37, 99, 235, 0.3); filter: brightness(1.1); }
.auth-btn:active { transform: translateY(0) scale(0.96) !important; }

#payProBtn { background: linear-gradient(135deg, #2563eb, #1d4ed8) !important; color: white !important; font-weight: 600 !important; letter-spacing: 1px; }
#payProBtn:hover { background: linear-gradient(135deg, #3b82f6, #2563eb) !important; }