/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --border-color: #e5e7eb;
    --accent-color: #3b82f6;
    --success-color: #10b981;
    --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);
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition);
    border-bottom: 1px solid transparent;
}

.navbar.scrolled {
    border-bottom-color: var(--border-color);
    box-shadow: var(--shadow-sm);
}

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

.logo {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: var(--transition);
}

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

/* Hero 区域 */
.hero {
    padding: 140px 0 80px;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-tag {
    display: inline-block;
    background: var(--primary-color);
    color: white;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 20px;
}

.hero-text h1 {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.highlight {
    color: var(--primary-color);
}

.hero-desc {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.8;
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 32px;
}

.tag {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
}

.hero-buttons {
    display: flex;
    gap: 16px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

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

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.stat-item {
    background: var(--bg-primary);
    padding: 24px;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow-md);
}

.stat-number {
    display: block;
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

/* 项目展示 */
.projects {
    padding: 100px 0;
    background: var(--bg-primary);
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 12px;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 18px;
    margin-bottom: 60px;
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.project-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 28px;
    transition: var(--transition);
}

.project-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.project-card.featured {
    grid-column: span 2;
    border-color: var(--primary-color);
    border-width: 2px;
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.project-tag {
    background: var(--primary-color);
    color: white;
    padding: 4px 12px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
}

.project-links {
    display: flex;
    gap: 12px;
}

.link-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 8px 14px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
}

.link-btn:hover {
    background: var(--primary-color);
    color: white;
}

.link-placeholder {
    background: var(--bg-tertiary);
    color: var(--text-light);
    padding: 8px 14px;
    border-radius: 6px;
    font-size: 13px;
}

.project-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.project-desc {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.7;
    margin-bottom: 16px;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.project-tech span {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 4px 12px;
    border-radius: 4px;
    font-size: 13px;
    font-weight: 500;
}

.project-highlight {
    background: var(--bg-secondary);
    padding: 16px;
    border-radius: 8px;
    margin-bottom: 16px;
}

.project-highlight strong {
    display: block;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.project-highlight ul {
    margin-left: 20px;
    color: var(--text-secondary);
    font-size: 14px;
}

.project-highlight li {
    margin-bottom: 4px;
}

.project-screenshots {
    margin-top: 20px;
}

.screenshots-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.screenshots-placeholder {
    background: var(--bg-tertiary);
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 40px;
    text-align: center;
    color: var(--text-light);
}

.screenshots-tip {
    font-size: 12px;
    margin-top: 8px;
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
    margin-top: 12px;
}

.screenshots-grid img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.screenshots-grid img:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
}

.project-subtitle {
    font-size: 14px;
    color: var(--text-light);
    margin-top: 4px;
    margin-bottom: 12px;
}

.paper-keywords {
    font-size: 13px;
    color: var(--text-light);
    margin-top: 16px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

/* 荣誉奖项 */
.honors {
    padding: 100px 0;
    background: var(--bg-primary);
}

.honors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 24px;
    margin-top: 48px;
}

.honor-card {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 28px;
    display: flex;
    align-items: flex-start;
    gap: 20px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--border-color);
}

.honor-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
}

.honor-card.highlight {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08) 0%, rgba(139, 92, 246, 0.08) 100%);
    border-color: rgba(99, 102, 241, 0.2);
}

.honor-icon {
    font-size: 32px;
    flex-shrink: 0;
}

.honor-content {
    flex: 1;
}

.honor-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.honor-award {
    font-size: 20px;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 8px;
}

.honor-project {
    font-size: 13px;
    color: var(--text-light);
    line-height: 1.6;
}

/* 更多项目与文档 */
.more-projects {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.project-group {
    margin-bottom: 48px;
}

.group-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 20px;
    padding-left: 8px;
    border-left: 3px solid var(--accent-color);
}

.docs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.doc-card {
    background: var(--bg-primary);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    align-items: flex-start;
    gap: 16px;
    text-decoration: none;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--border-color);
}

.doc-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
}

.doc-card.highlight {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, rgba(139, 92, 246, 0.05) 100%);
    border-color: rgba(99, 102, 241, 0.2);
}

.doc-icon {
    font-size: 28px;
    flex-shrink: 0;
}

.doc-info {
    flex: 1;
}

.doc-info h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.doc-info p {
    font-size: 13px;
    color: var(--text-light);
    line-height: 1.5;
    margin-bottom: 8px;
}

.doc-type {
    display: inline-block;
    font-size: 11px;
    font-weight: 500;
    color: var(--accent-color);
    background: rgba(99, 102, 241, 0.1);
    padding: 3px 10px;
    border-radius: 12px;
}

/* 技能图谱 */
.skills {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.skill-category {
    background: var(--bg-primary);
    padding: 28px;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
}

.skill-category-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-primary);
    padding-bottom: 12px;
    border-bottom: 2px solid var(--primary-color);
}

.skill-items {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.skill-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.skill-name {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

.skill-bar {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 4px;
    transition: width 1s ease;
}

/* 联系方式 */
.contact {
    padding: 100px 0;
    background: var(--bg-primary);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    margin-top: 40px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: 12px;
}

.contact-icon {
    font-size: 24px;
}

.contact-detail {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.contact-label {
    font-size: 12px;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.contact-detail a,
.contact-detail span {
    font-size: 16px;
    color: var(--text-primary);
    text-decoration: none;
}

.contact-detail a:hover {
    color: var(--primary-color);
}

.resume-download {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    padding: 40px;
    border-radius: 16px;
    text-align: center;
    color: white;
}

.resume-download h3 {
    font-size: 24px;
    margin-bottom: 8px;
}

.resume-download p {
    margin-bottom: 24px;
    opacity: 0.9;
}

.resume-download .btn {
    background: white;
    color: var(--primary-color);
}

.resume-download .btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* 页脚 */
.footer {
    padding: 40px 0;
    background: var(--bg-secondary);
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .hero-stats {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .project-grid {
        grid-template-columns: 1fr;
    }
    
    .project-card.featured {
        grid-column: span 1;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .hero-text h1 {
        font-size: 32px;
    }
    
    .hero-desc {
        font-size: 16px;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
    }
    
    .nav-links {
        display: none;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .project-card {
        padding: 20px;
    }
}