/* --- 全局样式 --- */
:root {
    --primary-color: #005f73; /* 主色调 (深青色) */
    --secondary-color: #0a9396; /* 次色调 (亮青色) */
    --light-color: #f4f4f4; /* 浅色背景 */
    --dark-color: #333; /* 深色文字 */
    --white-color: #fff;
    --shadow: 0 4px 10px rgba(0,0,0,0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    background-color: var(--white-color);
    color: var(--dark-color);
}

html {
    scroll-behavior: smooth; /* 点击导航栏平滑滚动 */
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 60px 0;
}

.section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 40px;
    color: var(--primary-color);
}

.bg-light {
    background-color: var(--light-color);
}

/* --- 导航栏 --- */
#navbar {
    background: var(--white-color);
    color: var(--dark-color);
    position: fixed; /* 固定在顶部 */
    top: 0;
    width: 100%;
    z-index: 100;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    transition: background-color 0.3s, box-shadow 0.3s;
}

#navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

#navbar .nav-logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

#navbar ul {
    display: flex;
    list-style: none;
}

#navbar ul li a {
    color: var(--dark-color);
    text-decoration: none;
    padding: 10px 15px;
    font-weight: 500;
    transition: color 0.3s;
}

#navbar ul li a:hover {
    color: var(--secondary-color);
}

/* --- 首页 Header --- */
#home {
    background: linear-gradient(rgba(0, 95, 115, 0.8), rgba(0, 95, 115, 0.8)), url('https://images.unsplash.com/photo-1519389950473-47ba0277781c?q=80&w=2070') center center/cover no-repeat;
    color: var(--white-color);
    height: 100vh; /* 占满整个屏幕 */
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

/* 页面加载淡入动画 */
.animate-fade-in {
    animation: fadeIn 1s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

#home h1 {
    font-size: 3.5rem;
    margin-bottom: 10px;
}

#home .subtitle {
    font-size: 1.5rem;
    margin-bottom: 20px;
    font-weight: 300;
}

#home p {
    font-size: 1.1rem;
    margin-bottom: 30px;
}

.btn {
    display: inline-block;
    background: var(--secondary-color);
    color: var(--white-color);
    padding: 12px 25px;
    text-decoration: none;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: bold;
    transition: background-color 0.3s, transform 0.3s;
}

.btn:hover {
    background: #0a9f9c;
    transform: translateY(-2px);
}

/* --- 滚动渐入动画 --- */
.section.hidden {
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.section.visible {
    opacity: 1;
    transform: translateY(0);
}


/* --- 关于我 Section --- */
.about-content {
    display: grid;
    /* 原来是 1fr 1fr, 现在改为 1:2 的比例，照片占1份，文字占2份 */
    grid-template-columns: 1fr 2fr; 
    gap: 40px;
    align-items: center; /* 垂直居中 */
}

/* 【【【 新增的照片样式 】】】 */
.about-image img {
    width: 100%;
    max-width: 250px; /* 限制照片最大宽度 */
    border-radius: 50%; /* 圆形照片 */
    display: block;
    margin: 0 auto; /* 在它的列中居中 */
    box-shadow: var(--shadow);
}

/* 【【【 新增的文字包裹样式 】】】 */
.about-text {
    display: flex;
    flex-direction: column;
    gap: 30px; /* 保持两个卡片间的距离 */
}


.education-card, .awards-card {
    background: var(--white-color);
    padding: 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
}
/* ... (后面的 .about-content h3, ul 等样式保持不变) ... */

.about-content h3 {
    color: var(--primary-color);
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 10px;
    margin-bottom: 20px;
}

.about-content ul {
    list-style: none;
}

.about-content ul li {
    margin-bottom: 15px;
}

.about-content ul li strong {
    color: var(--dark-color);
    display: block;
}

.about-content ul li p {
    color: #555;
    margin-top: 2px;
}

/* --- 实习经历 Section --- */
.experience-card {
    background: var(--white-color);
    padding: 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.exp-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.exp-header h3 {
    color: var(--primary-color);
    font-size: 1.8rem;
}

.exp-date {
    background: var(--secondary-color);
    color: var(--white-color);
    padding: 5px 10px;
    border-radius: 5px;
    font-size: 0.9rem;
}

.exp-role {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--dark-color);
    margin-bottom: 20px;
    border-bottom: 1px solid #eee;
    padding-bottom: 20px;
}

.exp-project {
    margin-bottom: 20px;
}

.exp-project:last-child {
    margin-bottom: 0;
}

.exp-project h4 {
    color: var(--dark-color);
    font-size: 1.1rem;
    margin-bottom: 10px;
}

.exp-project ul {
    list-style-type: disc;
    margin-left: 20px;
    color: #555;
}

/* --- 项目经历 Section --- */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
}

.project-card {
    background: var(--white-color);
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 25px;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0,0,0,0.15);
}

.project-card h3 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

.project-date {
    color: #777;
    font-size: 0.9rem;
    font-style: italic;
    margin-bottom: 15px;
}

.project-card p {
    margin-bottom: 10px;
    color: #555;
}

.project-card p:last-child {
    margin-bottom: 0;
}

/* --- 成果发表 Section (新增) --- */
.publications-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.publication-column {
    background: var(--white-color);
    padding: 25px;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.publication-column h3 {
    color: var(--primary-color);
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 10px;
    margin-bottom: 20px;
}

.publication-column ul {
    list-style: none;
}

.publication-column ul li {
    margin-bottom: 15px;
}

.publication-column ul li strong {
    color: var(--dark-color);
    display: block;
    font-size: 1.1rem;
}

.publication-column ul li p {
    color: #555;
    margin-top: 3px;
    font-size: 0.9rem;
}

/* 【【【 新增的样式规则，用于美化链接 】】】 */
.publication-column ul li strong a {
    color: var(--dark-color); /* 继承 strong 文本颜色 */
    text-decoration: none;
    transition: color 0.3s;
}

.publication-column ul li strong a:hover {
    color: var(--secondary-color); /* 悬停时变为主题色 */
    text-decoration: underline;
}


/* --- 技能 Section --- */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.skill-category {
    background: var(--white-color);
    padding: 25px;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.skill-category h3 {
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 20px;
}

.skill-category ul {
    list-style: none;
}

.skill-category ul li {
    background: #eef;
    color: var(--dark-color);
    padding: 10px;
    margin-bottom: 8px;
    border-radius: 5px;
    text-align: center;
}

/* --- 页脚/联系 --- */
#contact {
    background: var(--dark-color);
    color: var(--white-color);
    text-align: center;
    padding: 60px 0;
}

#contact h2 {
    color: var(--white-color);
}

#contact p {
    font-size: 1.1rem;
    margin-bottom: 30px;
}

#contact ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 30px;
}

#contact ul li {
    font-size: 1rem;
}

.copyright {
    font-size: 0.9rem;
    color: #aaa;
}

/* --- 响应式设计 (适应手机) --- */
@media(max-width: 768px) {
    #navbar .container {
        flex-direction: column;
        height: auto;
    }

    #navbar ul {
        flex-direction: column;
        width: 100%;
        text-align: center;
    }

    #navbar ul li {
        padding: 5px 0;
    }
    
    #home {
        height: auto;
        padding-top: 150px; /* 避开导航栏 */
        padding-bottom: 100px;
    }

    #home h1 {
        font-size: 2.5rem;
    }

    #home .subtitle {
        font-size: 1.2rem;
    }

    .about-content, .skills-grid, .publications-grid {
        grid-template-columns: 1fr;
    }

    .exp-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .exp-date {
        margin-top: 10px;
    }

    #contact ul {
        flex-direction: column;
        gap: 15px;
    }
}