:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --text-color: #1f2937;
    --light-bg: #f3f4f6;
    --white: #ffffff;
    --navbar-height: 105px;
}

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

body {
    font-family: 'Noto Sans SC', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5%;
    background: var(--white);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    z-index: 1000;
    height: var(--navbar-height);
}

.logo-container {
    text-align: left;
    display: flex;
    align-items: center;
}

.logo-img {
    height: 72px;
    width: auto;
    display: block;
}

/* 导航栏链接样式调整 */
.nav-links {
    display: flex;
    gap: 3rem;
    margin-right: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s ease;
    white-space: nowrap;
}

.nav-links a:hover {
    color: var(--primary-color);
}

/* Hero Section 样式 */
.hero {
    padding: 8rem 5% 3rem;
    background: url('images/background.jpg') center/cover no-repeat;
    height: auto;
    display: flex;
    align-items: center;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 4rem;
    padding: 2.5rem 0;
}

.hero-text {
    flex: 1;
    text-align: left;
    padding-top: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 1.5rem;
}

.hero-text h1 {
    font-size: 3.5rem;
    margin-top: 0;
    color: var(--white);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    white-space: nowrap;
}

.typing-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--white);
    font-size: 1.8rem;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

.static-text {
    font-weight: 500;
}

.typing-text::after {
    content: '|';
    animation: blink 0.7s infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

/* CTA 容器样式 */
.cta-container {
    flex: 0 0 400px;
    background: rgba(255, 255, 255, 0.95);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin: 0.5rem 0;
}

.form-title {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    color: var(--text-color);
    text-align: center;
    white-space: nowrap;
}

.cta-form {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.form-group {
    position: relative;
}

.form-group input {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #d1d5db;
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

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

.phone-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.phone-prefix {
    padding: 0.8rem;
    background: #f3f4f6;
    border: 1px solid #d1d5db;
    border-radius: 0.5rem;
    color: var(--text-color);
    font-size: 1rem;
}

.cta-button {
    width: 100%;
    background: var(--primary-color);
    color: var(--white);
    padding: 1rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.cta-button:hover {
    background: var(--secondary-color);
}

/* 响应式设计更新 */
@media (max-width: 1024px) {
    .hero-container {
        flex-direction: column;
        gap: 2rem;
        padding: 0 1rem;
    }

    .hero-text {
        text-align: center;
    }

    .hero-text h1 {
        font-size: 2.8rem;
        white-space: normal;
    }

    .cta-container {
        flex: 0 0 auto;
        width: 100%;
        max-width: 400px;
    }
}

@media (max-width: 768px) {
    .hero-text h1 {
        font-size: 2rem;
    }

    .hero-text h2 {
        font-size: 1.2rem;
    }

    .form-title {
        font-size: 1.3rem;
        white-space: normal;
    }

    .typing-container {
        font-size: 1.4rem;
        justify-content: center;
    }
}

/* 响应式调整 */
@media (max-width: 1200px) {
    .nav-links {
        gap: 2rem;
    }
}

@media (max-width: 992px) {
    .nav-links {
        gap: 1.5rem;
    }
}

/* 修改内容区域通用样式 */
.content-section {
    padding: 6rem 0;
    border-bottom: 1px solid #e5e7eb;
    scroll-margin-top: 120px;
}

/* 为知识社区部分移除底部边框 */
#community {
    border-bottom: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 5%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-color);
    text-align: center;
    margin-bottom: 4rem;
    width: 100%;
}

.section-content {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-color);
    width: 100%;
    max-width: none;
    text-align: left;
}

/* 修改适宜对象样式 */
.target-list {
    list-style: none;
    padding: 0;
    margin: 2rem 0;
    text-align: left;
}

/* 修改学习成果样式 */
.outcomes-intro {
    margin-bottom: 2rem;
}

/* 修改学习成果网格布局 */
.outcomes-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-top: 2rem;
    width: 100%;
}

/* 确保奇数个学习成果项目也能保持良好布局 */
.outcomes-grid .outcome-item:last-child:nth-child(odd) {
    grid-column: 1 / -1;
    max-width: calc(50% - 0.75rem);
}

/* 修改课程结构样式 */
.structure-intro {
    margin-bottom: 2rem;
}

/* 修改课程模块容器 */
.modules-container {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* 适宜对象样式 */
.target-list li {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
    position: relative;
}

.target-list li::before {
    content: "•";
    color: var(--primary-color);
    font-size: 1.5rem;
    position: absolute;
    left: 0;
    top: -0.2rem;
}

/* 学习成果样式 */
.outcome-item {
    background: var(--light-bg);
    padding: 2rem;
    border-radius: 1rem;
    text-align: left;
}

.outcome-item h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

/* 课程结构样式 */
.module-item {
    background: var(--white);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    text-align: left;
}

.module-item h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

/* 响应式设计补充 */
@media (max-width: 768px) {
    .content-section {
        scroll-margin-top: 90px;
    }
    
    :root {
        --navbar-height: 75px;
    }
    
    .section-title {
        margin-bottom: 3rem;
    }
    
    .outcomes-grid {
        grid-template-columns: 1fr;
    }
}

/* 修改师资介绍样式 */
.faculty-profile {
    display: flex;
    gap: 3rem;
    align-items: flex-start;
}

.faculty-image {
    flex: 0 0 300px;
}

.faculty-image img {
    width: 100%;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.faculty-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
}

.faculty-name {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 0.8rem;
    margin-top: -0.3rem;
}

.faculty-title {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.faculty-email {
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
    font-size: 1rem;
}

.faculty-positions {
    list-style: none;
    padding: 0;
    margin: 0 0 1.5rem 0;
}

.faculty-positions li {
    margin-bottom: 0.6rem;
    line-height: 1.5;
    font-size: 1rem;
}

.faculty-description {
    line-height: 1.6;
    font-size: 1rem;
    margin-top: auto;
    padding-bottom: 0.2rem;
}

/* 响应式设计补充 */
@media (max-width: 768px) {
    .faculty-profile {
        flex-direction: column;
        gap: 2rem;
    }

    .faculty-image {
        flex: 0 0 auto;
        max-width: 250px;
        margin: 0 auto;
    }

    .faculty-info {
        height: auto;
    }

    .faculty-name {
        margin-top: 0;
        text-align: center;
    }

    .faculty-title {
        text-align: center;
    }

    .faculty-email {
        text-align: center;
    }
}

/* 课程助手样式 */
.chat-container {
    background: var(--white);
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

/* 助手介绍区域 */
.assistant-intro {
    padding: 2rem;
    background: var(--light-bg);
    border-bottom: 1px solid #e5e7eb;
}

.assistant-profile {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.assistant-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: contain;
}

.assistant-greeting {
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--text-color);
}

.assistant-description {
    color: #6b7280;
    font-size: 1rem;
}

/* 聊天区域 */
.chat-messages {
    height: 400px;
    overflow-y: auto;
    padding: 1.5rem;
    background: #f9fafb;
}

/* 修改输入区域样式 */
.chat-input-container {
    padding: 1rem;
    border-top: 1px solid #e5e7eb;
    background: var(--white);
}

.input-wrapper {
    position: relative;
    background: #f9fafb;
    border: 1px solid #d1d5db;
    border-radius: 1rem;
    padding: 1rem;
}

.chat-input {
    width: 100%;
    min-height: 120px;
    padding: 0.8rem;
    border: none;
    background: transparent;
    resize: none;
    font-size: 1rem;
    line-height: 1.5;
    margin-bottom: 2.5rem;
}

.chat-input:focus {
    outline: none;
}

.input-controls {
    position: absolute;
    bottom: 1rem;
    left: 1rem;
    right: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.feature-buttons {
    display: flex;
    gap: 0.5rem;
}

.feature-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border: 1px solid #d1d5db;
    border-radius: 0.5rem;
    background: var(--white);
    color: #4b5563;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.feature-btn:hover {
    background: #f3f4f6;
    border-color: #9ca3af;
}

.send-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary-color);
    color: var(--white);
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.send-btn:hover {
    background: var(--secondary-color);
}

.send-btn i {
    font-size: 1.2rem;
}

/* 响应式设计补充 */
@media (max-width: 768px) {
    .chat-container {
        border-radius: 0;
        box-shadow: none;
    }
    
    .chat-messages {
        height: 350px;
    }
    
    .input-controls {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-end;
    }
    
    .feature-buttons {
        width: 100%;
        justify-content: space-between;
    }
    
    .feature-btn {
        font-size: 0.8rem;
        padding: 0.4rem 0.8rem;
    }
}

/* 聊天消息样式 */
.message {
    display: flex;
    margin-bottom: 1rem;
    animation: fadeIn 0.3s ease;
}

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

.assistant-message {
    justify-content: flex-start;
}

.message-content {
    max-width: 85%;
    padding: 1.2rem;
    border-radius: 1rem;
    word-wrap: break-word;
}

.message-text {
    line-height: 1.6;
    overflow-wrap: break-word;
    word-wrap: break-word;
    word-break: break-word;
    max-width: 100%;
}

.message-text > *:not(.thinking-process):not(.thought-divider) {
    margin-right: 1rem;
}

.message-text h2,
.message-text h3,
.message-text strong,
.message-text p,
.message-text li {
    color: #333 !important;
}

.message-text h2 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-top: 1rem;
    margin-bottom: 0.8rem;
    color: var(--primary-color);
}

.message-text h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-top: 0.8rem;
    margin-bottom: 0.6rem;
    color: var(--primary-color);
}

.message-text ul, 
.message-text ol {
    padding-left: 1.2rem;
    margin: 0.5rem 0;
}

.message-text li {
    margin-bottom: 0.5rem;
}

.message-text p {
    margin-bottom: 0.8rem;
}

.message-text strong {
    color: var(--primary-color);
    font-weight: 600;
}

/* 调整消息气泡样式 */
.user-message .message-content {
    background: var(--primary-color);
    color: var(--white);
    margin-left: 2rem;
}

.assistant-message .message-content {
    max-width: 85%;
    margin-right: 2rem;
    background: var(--light-bg);
}

/* 确保用户消息中的文本颜色保持白色 */
.user-message .message-text * {
    color: var(--white) !important;
}

/* 功能按钮激活状态 */
.feature-btn.active {
    background: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

/* 打字动画 */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.typing::after {
    content: '';
    display: inline-block;
    width: 4px;
    height: 14px;
    background: var(--text-color);
    margin-left: 4px;
    animation: blink 1s infinite;
}

@keyframes blink {
    50% { opacity: 0; }
}

/* 思考过程样式 */
.thinking-process {
    font-size: 0.75rem;
    color: #999;  /* 更浅的灰色 */
    background: transparent;
    padding: 0.8rem 1.5rem 0.8rem 2.5rem;  /* 增加左边距 */
    margin: 0.5rem 0 1rem 1.5rem;  /* 整体向右移动 */
    position: relative;
    line-height: 1.5;
}

/* 左侧竖线样式 */
.thinking-process::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: #e0e0e0;  /* 浅灰色竖线 */
}

/* 思考过程内容样式 */
.thinking-process p {
    color: #999;
    font-size: 0.75rem;
    margin-bottom: 0.8rem;
    line-height: 1.5;
    font-weight: normal !important;
}

/* 移除所有列表样式 */
.thinking-process ul,
.thinking-process ol {
    list-style: none;
    padding: 0;
    margin: 0;
}

.thinking-process li {
    color: #999;
    font-size: 0.75rem;
    margin-bottom: 0.8rem;
    line-height: 1.5;
    font-weight: normal !important;
    padding: 0;
}

/* 移除所有加粗和强调样式 */
.thinking-process strong,
.thinking-process b,
.thinking-process em,
.thinking-process i {
    font-weight: normal !important;
    font-style: normal !important;
}

/* 分隔线样式 */
.thought-divider {
    margin: 1.5rem 0;
    border-top: 1px solid #e5e5e5;
    position: relative;
}

/* 问题标题样式 */
.thought-divider::after {
    content: attr(data-title);
    position: absolute;
    top: -0.7rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--light-bg);
    padding: 0 1rem;
    color: #666;
    font-size: 0.8rem;
    white-space: nowrap;
}

/* 正文内容样式 */
.final-answer {
    padding: 0.5rem 1rem;
    font-size: 0.95rem;
    color: #333;
}

.final-answer h2,
.final-answer h3,
.final-answer p,
.final-answer li {
    color: #333 !important;
}

.final-answer h2 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.final-answer h3 {
    font-size: 1.1rem;
    margin: 1rem 0 0.5rem 0;
}

.final-answer ul,
.final-answer ol {
    margin: 0.8rem 0;
    padding-left: 1.2rem;
}

.final-answer li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

/* 确保助手消息中的思考过程样式正确 */
.assistant-message .thinking-process {
    background: rgba(255, 255, 255, 0.8);
    margin: 0 0 1rem 0;
}

/* 页脚样式优化 */
.site-footer {
    background-color: #1a1a1a;
    padding-top: 3rem;
    margin-top: 4rem;
    color: rgba(255, 255, 255, 0.9);
}

/* 调整logo尺寸和样式 */
.footer-logo {
    height: 48px;  /* 增大到48px */
    width: auto;
    margin-bottom: 1.5rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 2rem;
    width: 90%;
}

/* 左侧区域样式 */
.footer-section:first-child {
    flex: 0 0 auto;
    min-width: 300px;
    margin-right: auto;
}

.footer-description {
    color: rgba(255, 255, 255, 0.8);  /* 稍微柔和的白色 */
    font-size: 0.9rem;
    line-height: 1.6;
}

/* 中间区域样式 */
.footer-section:nth-child(2) {
    flex: 0 0 auto;
    min-width: 250px;
    margin: 0 auto;
}

/* 右侧区域样式 */
.footer-section:last-child {
    flex: 0 0 auto;
    min-width: 200px;
    margin-left: auto;
    text-align: right;
}

.footer-section h4 {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.1rem;
    margin-bottom: 1rem;
    font-weight: 500;
}

/* 联系信息样式 */
.contact-list {
    list-style: none;
    padding: 0;
}

.contact-list li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.8rem;
    color: rgba(255, 255, 255, 0.8);
}

.contact-list i {
    color: rgba(255, 255, 255, 0.6);
    width: 20px;
}

.contact-list span {
    color: rgba(255, 255, 255, 0.8);
}

/* 社交媒体图标样式 */
.social-links {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.8);
    transition: all 0.3s ease;
    text-decoration: none;
}

.social-link:hover {
    background: rgba(255, 255, 255, 0.15);
    color: rgba(255, 255, 255, 0.9);
}

/* 底部版权区域 */
.footer-bottom {
    margin-top: 3rem;
    padding: 1.5rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom .footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.copyright {
    color: rgba(255, 255, 255, 0.8);
    margin-right: auto;
}

.footer-links {
    margin-left: auto;
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
}

.separator {
    color: rgba(255, 255, 255, 0.3);
}

/* 响应式调整 */
@media (max-width: 1024px) {
    .footer-container {
        justify-content: space-between;
        gap: 3rem;
    }
    
    .footer-section:nth-child(2) {
        margin: 0;  /* 移动端取消居中 */
    }
}

@media (max-width: 768px) {
    .footer-container {
        flex-direction: column;
        align-items: flex-start;
        gap: 2rem;
    }
    
    .footer-section,
    .footer-section:first-child,
    .footer-section:nth-child(2),
    .footer-section:last-child {
        width: 100%;
        margin: 0;
        text-align: left;
    }
    
    .footer-bottom .footer-container {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .footer-links {
        margin: 0;
    }
}

/* 知识社区样式优化 */
.community-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    max-width: 900px;  /* 限制内容最大宽度 */
    margin: 0 auto;
}

.community-description {
    max-width: none;  /* 移除最大宽度限制 */
    margin: 0;  /* 移除自动边距 */
    text-align: left;
    line-height: 1.8;
    color: var(--text-color);
    padding: 0;
}

.community-description p {
    margin-bottom: 1rem;  /* 添加段落间距 */
}

.community-survey {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 4rem;
    margin-top: 3rem;
}

.survey-left {
    flex: 0 0 300px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.qrcode-img {
    width: 200px;
    height: 200px;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.survey-button {
    display: inline-block;
    padding: 1rem 2.5rem;
    background-color: var(--primary-color);
    color: var(--white);
    text-decoration: none;
    border-radius: 0.5rem;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

.survey-button:hover {
    background-color: var(--secondary-color);
}

.survey-right {
    flex: 1;
    max-width: 600px;
}

.survey-preview {
    width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* 响应式调整 */
@media (max-width: 992px) {
    .community-survey {
        flex-direction: column;
        gap: 3rem;
    }

    .survey-left {
        flex: 0 0 auto;
    }

    .survey-right {
        width: 100%;
        max-width: 500px;
        margin: 0 auto;
    }

    .community-content {
        max-width: 100%;  /* 在移动端取消最大宽度限制 */
    }
    
    .community-description {
        padding: 0 1rem;  /* 在移动端添加边距 */
    }
}

@media (max-width: 576px) {
    .qrcode-img {
        width: 180px;
        height: 180px;
    }

    .community-description {
        padding: 0;  /* 移除移动端的内边距 */
    }
}