@charset "UTF-8";

:root {
    --primary-color: #3498db;
    --secondary-color: #2980b9;
    --accent-color: #e74c3c;
    --background-color: #f8f9fa;
    --card-bg: rgba(255, 255, 255, 0.9);
    --text-color: #2c3e50;
    --text-secondary: #7f8c8d;
    --border-color: #e9ecef;
    --shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
    --radius: 12px;
}

[data-theme="dark"] {
    --primary-color: #00ffff;
    --secondary-color: #0080ff;
    --accent-color: #ff6b6b;
    --background-color: #0a0a0a;
    --card-bg: rgba(0, 20, 40, 0.8);
    --text-color: #e0f6ff;
    --text-secondary: #80d4ff;
    --border-color: rgba(0, 255, 255, 0.3);
    --shadow: 0 4px 20px rgba(0, 255, 255, 0.2);
}

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

body {
    font-family: 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-attachment: fixed;
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
}

[data-theme="dark"] body {
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a2e 50%, #16213e 100%);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    text-align: center;
    margin-bottom: 3rem;
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
}

.avatar-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 4px solid var(--primary-color);
    box-shadow: 0 8px 25px rgba(52, 152, 219, 0.3);
    transition: var(--transition);
    object-fit: cover;
}

.avatar:hover {
    transform: scale(1.05);
    box-shadow: 0 12px 35px rgba(52, 152, 219, 0.4);
}

.name {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0;
}

.title {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin: 0;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    text-decoration: none;
    transition: var(--transition);
    font-size: 1.2rem;
}

.social-links a:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(52, 152, 219, 0.4);
}

.nav {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.5rem;
    background: var(--card-bg);
    border: 2px solid transparent;
    border-radius: var(--radius);
    color: var(--text-color);
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    font-size: 0.9rem;
    font-weight: 500;
}

.nav-btn:hover {
    transform: translateY(-2px);
    border-color: var(--primary-color);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

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

.main {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
    min-height: 500px;
}

.section {
    display: block;
    margin-bottom: 3rem;
    padding: 2rem 0;
}

.section:last-child {
    margin-bottom: 0;
}

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

.section h2 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    text-align: center;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-content p {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.skills {
    margin-top: 2rem;
    text-align: center;
}

.skills h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    justify-content: center;
}

.skill-tag {
    background: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

.skill-tag:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.project-card {
    background: var(--background-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.project-icon {
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    color: white;
    font-size: 1.5rem;
}

.project-card h3 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.project-card p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tag {
    background: var(--text-secondary);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
}

.project-links {
    display: flex;
    gap: 1rem;
}

.project-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-size: 0.9rem;
    transition: var(--transition);
}

.project-link:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
}

.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--primary-color);
    transform: translateX(-50%);
}

.timeline-item {
    display: flex;
    margin-bottom: 2rem;
    position: relative;
}

.timeline-item:nth-child(odd) {
    flex-direction: row;
}

.timeline-item:nth-child(even) {
    flex-direction: row-reverse;
}

.timeline-date {
    flex: 0 0 120px;
    background: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    text-align: center;
    font-weight: 600;
    margin: 0 2rem;
    position: relative;
    z-index: 2;
}

.timeline-content {
    flex: 1;
    background: var(--background-color);
    padding: 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.timeline-content h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.timeline-content p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    align-items: center;
    min-height: 300px;
    padding: 2rem;
}

.cloud-tag {
    background: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 25px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.cloud-tag:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.cloud-tag.size-small {
    font-size: 0.8rem;
    opacity: 0.7;
}

.cloud-tag.size-medium {
    font-size: 1rem;
    opacity: 0.85;
}

.cloud-tag.size-large {
    font-size: 1.3rem;
    opacity: 1;
    background: var(--accent-color);
}

.footer {
    text-align: center;
    margin-top: 3rem;
    padding: 2rem;
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
}

.footer p {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .header {
        padding: 1.5rem;
    }
    
    .avatar {
        width: 100px;
        height: 100px;
    }
    
    .name {
        font-size: 2rem;
    }
    
    .nav {
        gap: 0.5rem;
    }
    
    .nav-btn {
        padding: 0.6rem 1rem;
        font-size: 0.8rem;
    }
    
    .main {
        padding: 1.5rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .timeline::before {
        left: 30px;
    }
    
    .timeline-item {
        flex-direction: column !important;
        margin-left: 60px;
    }
    
    .timeline-date {
        position: absolute;
        left: -90px;
        top: 0;
        margin: 0;
        flex: none;
        width: 80px;
        font-size: 0.8rem;
    }
    
    .timeline-content {
        margin-left: 0;
    }
    
    .tag-cloud {
        padding: 1rem;
    }
    
    .cloud-tag.size-large {
        font-size: 1.1rem;
    }
    
    .social-links {
        gap: 0.8rem;
    }
    
    .social-links a {
        width: 45px;
        height: 45px;
        font-size: 1.1rem;
    }
}