:root {
    --color-bg: #fafaf9;
    --color-bg-alt: #f5f5f4;
    --color-text: #292524;
    --color-text-muted: #78716c;
    --color-accent: #ea580c;
    --color-accent-light: #fdba74;
    --color-border: #e7e5e4;
    --color-card-bg: #ffffff;
    --font-display: 'Noto Serif SC', serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

[data-theme="dark"] {
    --color-bg: #1c1917;
    --color-bg-alt: #292524;
    --color-text: #fafaf9;
    --color-text-muted: #a8a29e;
    --color-accent: #fb923c;
    --color-accent-light: #fed7aa;
    --color-border: #44403c;
    --color-card-bg: #292524;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    transition: background-color var(--transition-medium), color var(--transition-medium);
}

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

.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--color-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    transition: background-color var(--transition-medium), border-color var(--transition-medium);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: var(--color-text);
}

.logo-text {
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.logo-subtitle {
    font-size: 12px;
    color: var(--color-text-muted);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

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

.nav-link {
    text-decoration: none;
    color: var(--color-text);
    font-size: 15px;
    font-weight: 500;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width var(--transition-medium);
}

.nav-link:hover {
    color: var(--color-accent);
}

.nav-link:hover::after {
    width: 100%;
}

.theme-toggle {
    background: none;
    border: 1px solid var(--color-border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    border-color: var(--color-accent);
    background-color: var(--color-accent);
    color: white;
}

.sun-icon, .moon-icon {
    width: 20px;
    height: 20px;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.sun-icon {
    opacity: 1;
}

.moon-icon {
    opacity: 0;
    position: absolute;
}

[data-theme="dark"] .sun-icon {
    opacity: 0;
}

[data-theme="dark"] .moon-icon {
    opacity: 1;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    transition: all var(--transition-fast);
}

.hero {
    padding: 120px 0;
    overflow: hidden;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.hero-title {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 24px;
}

.greeting {
    font-family: var(--font-body);
    font-size: 18px;
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.name {
    font-family: var(--font-display);
    font-size: 72px;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.03em;
}

.hero-subtitle {
    font-size: 24px;
    line-height: 1.5;
    color: var(--color-text-muted);
    margin-bottom: 40px;
}

.highlight {
    color: var(--color-text);
    font-weight: 600;
}

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

.btn {
    padding: 14px 32px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
}

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

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

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

.btn-secondary:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.visual-card {
    width: 400px;
    height: 400px;
    border-radius: 24px;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.visual-pattern {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        repeating-linear-gradient(45deg, transparent, transparent 35px, rgba(255,255,255,0.1) 35px, rgba(255,255,255,0.1) 70px);
}

.section {
    padding: 100px 0;
}

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

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-title {
    font-family: var(--font-display);
    font-size: 48px;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--color-text-muted);
}

.experience-card {
    background-color: var(--color-card-bg);
    border-radius: 16px;
    padding: 48px;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-medium);
}

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

.experience-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 32px;
}

.company-info {
    flex: 1;
}

.company-name {
    font-family: var(--font-display);
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 4px;
}

.company-tagline {
    font-size: 18px;
    color: var(--color-text-muted);
}

.period {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-accent);
    background-color: var(--color-accent-light);
    padding: 8px 16px;
    border-radius: 20px;
}

.role-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 24px;
}

.achievements-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--color-accent);
}

.achievements-list {
    list-style: none;
}

.achievement-item {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
    align-items: flex-start;
}

.achievement-icon {
    font-size: 24px;
    color: var(--color-accent);
    flex-shrink: 0;
}

.achievement-content {
    font-size: 16px;
    line-height: 1.7;
}

.achievement-content strong {
    color: var(--color-text);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.skill-category {
    background-color: var(--color-card-bg);
    border-radius: 16px;
    padding: 32px;
    border: 1px solid var(--color-border);
    transition: all var(--transition-medium);
}

.skill-category:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-accent);
}

.category-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.category-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 16px;
}

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

.skill-list li {
    padding: 8px 0;
    font-size: 15px;
    color: var(--color-text-muted);
    border-bottom: 1px solid var(--color-border);
}

.skill-list li:last-child {
    border-bottom: none;
}

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

.work-card {
    background-color: var(--color-card-bg);
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: all var(--transition-medium);
}

.work-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.work-image {
    width: 100%;
    height: 240px;
    overflow: hidden;
}

.work-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-medium);
}

.work-card:hover .work-image img {
    transform: scale(1.05);
}

.work-content {
    padding: 28px;
}

.work-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.work-description {
    font-size: 15px;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-bottom: 20px;
}

.work-link {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 600;
    font-size: 15px;
    transition: all var(--transition-fast);
}

.work-link:hover {
    text-decoration: underline;
}

.education-awards-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
}

.subsection-title {
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 28px;
}

.education-item {
    background-color: var(--color-card-bg);
    border-radius: 16px;
    padding: 32px;
    border: 1px solid var(--color-border);
}

.degree {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 8px;
}

.school {
    font-size: 18px;
    color: var(--color-text-muted);
    margin-bottom: 8px;
}

.edu-period {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-accent);
}

.awards-list {
    list-style: none;
}

.awards-list li {
    padding: 16px 20px;
    margin-bottom: 12px;
    background-color: var(--color-card-bg);
    border-radius: 12px;
    border: 1px solid var(--color-border);
    font-size: 16px;
    transition: all var(--transition-fast);
}

.awards-list li:hover {
    border-color: var(--color-accent);
    transform: translateX(8px);
}

.footer {
    background-color: var(--color-bg-alt);
    padding: 64px 0 32px;
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
}

.footer-title {
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 4px;
}

.footer-tagline {
    color: var(--color-text-muted);
    font-size: 15px;
}

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

.footer-link {
    color: var(--color-text);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--color-accent);
}

.footer-bottom {
    text-align: center;
    padding-top: 32px;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: 14px;
}

/* 校园实践部分样式 */
.campus-item {
    background-color: var(--color-card-bg);
    border-radius: 16px;
    padding: 32px;
    border: 1px solid var(--color-border);
    margin-bottom: 24px;
}

.campus-position {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 8px;
}

.campus-period {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: 16px;
}

.campus-description {
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-text-muted);
}

@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .visual-card {
        width: 300px;
        height: 300px;
    }
    
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .works-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero {
        padding: 80px 0;
    }
    
    .name {
        font-size: 48px;
    }
    
    .hero-subtitle {
        font-size: 18px;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .section {
        padding: 64px 0;
    }
    
    .section-title {
        font-size: 36px;
    }
    
    .experience-header {
        flex-direction: column;
        gap: 16px;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .works-grid {
        grid-template-columns: 1fr;
    }
    
    .education-awards-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 24px;
        text-align: center;
    }
    
    .campus-item {
        padding: 24px;
    }
    
    .campus-position {
        font-size: 18px;
    }
}

@media (max-width: 480px) {
    .name {
        font-size: 36px;
    }
    
    .visual-card {
        width: 250px;
        height: 250px;
    }
    
    .experience-card {
        padding: 32px 24px;
    }
}