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

.main-nav.scrolled {
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.brand-icon {
    font-size: 1.5rem;
}

.brand-text {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--deep-green);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    color: var(--dark-text);
    font-weight: 500;
    transition: var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
    background-color: rgba(46, 139, 87, 0.1);
    color: var(--primary-green);
}

.nav-link i {
    font-size: 0.9rem;
}

.nav-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--dark-text);
    cursor: pointer;
}

/* ========== 英雄区域 ========== */
.hero-section {
    padding-top: 120px;
    padding-bottom: 80px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e8f5e9 100%);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" preserveAspectRatio="none"><path fill="%232e8b57" opacity="0.03" d="M0,0 L100,0 L100,100 Z"/></svg>');
    background-size: cover;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-tagline {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(46, 139, 87, 0.1);
    border-radius: 50px;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--primary-green);
}

.tagline-icon {
    font-size: 1.2rem;
}

.hero-title {
    margin-bottom: 1.5rem;
}

.title-line {
    display: block;
    font-family: var(--font-serif);
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--dark-text);
    line-height: 1.1;
}

.title-sub {
    display: block;
    font-size: 1.2rem;
    font-weight: 400;
    color: var(--stone-gray);
    margin-top: 0.5rem;
}

.hero-description {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--dark-text);
    opacity: 0.9;
    margin-bottom: 2rem;
    max-width: 90%;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-image {
    position: relative;
}

.image-container {
    position: relative;
    width: 100%;
    aspect-ratio: 1;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.placeholder-image {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-green), var(--ocean-blue));
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.image-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 2rem;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
    color: white;
}

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

.image-quote {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    font-style: italic;
    line-height: 1.4;
}

.decorative-circle {
    position: absolute;
    border-radius: 50%;
    background: rgba(46, 139, 87, 0.1);
    z-index: -1;
}

.circle-1 {
    width: 200px;
    height: 200px;
    top: -50px;
    right: -50px;
    background: rgba(135, 206, 235, 0.1);
}

.circle-2 {
    width: 150px;
    height: 150px;
    bottom: -30px;
    left: -30px;
    background: rgba(139, 115, 85, 0.1);
}

.circle-3 {
    width: 100px;
    height: 100px;
    top: 30%;
    left: -20px;
    background: rgba(30, 144, 255, 0.1);
}

/* ========== 个人简介区域 ========== */
.bio-section {
    padding: var(--spacing-xl) 0;
}

.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
    color: var(--dark-text);
}

.title-icon {
    font-size: 1.5rem;
}

.section-subtitle {
    color: var(--stone-gray);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

.bio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.bio-card {
    background: white;
    border-radius: var(--radius-md);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
    height: 100%;
}

.bio-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid rgba(46, 139, 87, 0.1);
}

.card-icon {
    width: 48px;
    height: 48px;
    background: rgba(46, 139, 87, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-green);
    font-size: 1.2rem;
}

.card-title {
    font-size: 1.4rem;
    color: var(--dark-text);
    margin: 0;
}

.timeline {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.timeline-item {
    display: flex;
    gap: 1rem;
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 21px;
    top: 30px;
    bottom: -1.5rem;
    width: 2px;
    background: rgba(46, 139, 87, 0.2);
}

.timeline-item:last-child::before {
    display: none;
}

.timeline-year {
    min-width: 60px;
    height: 40px;
    background: var(--primary-green);
    color: white;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
    z-index: 1;
}

.timeline-content {
    flex: 1;
}

.timeline-content h4 {
    margin-bottom: 0.25rem;
    color: var(--dark-text);
}

.institution {
    color: var(--primary-green);
    font-weight: 500;
    margin-bottom: 0.25rem;
    font-size: 0.9rem;
}

.thesis {
    color: var(--stone-gray);
    font-size: 0.9rem;
    font-style: italic;
    margin-top: 0.5rem;
}

.research-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.research-tag {
    padding: 0.5rem 1rem;
    background: rgba(46, 139, 87, 0.1);
    color: var(--primary-green);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    transition: var(--transition-fast);
}

.research-tag:hover {
    background: rgba(46, 139, 87, 0.2);
    transform: translateY(-2px);
}

.research-description {
    color: var(--dark-text);
    line-height: 1.6;
    opacity: 0.9;
}

.position-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.position-item {
    display: flex;
    gap: 1rem;
}

.position-year {
    min-width: 100px;
    font-weight: 600;
    color: var(--primary-green);
    font-size: 0.9rem;
}

.position-details h4 {
    margin-bottom: 0.25rem;
    color: var(--dark-text);
}

.position-details p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--stone-gray);
}

/* ========== 研究亮点 ========== */
.highlights-section {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #e8f5e9 100%);
}

.highlights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.highlight-card {
    background: white;
    border-radius: var(--radius-md);
    padding: 2rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
}

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

.highlight-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 1.5rem;
    background: rgba(46, 139, 87, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--primary-green);
}

.highlight-title {
    margin-bottom: 1rem;
    color: var(--dark-text);
}

.highlight-text {
    color: var(--dark-text);
    opacity: 0.9;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
    line-height: 1.6;
}

.highlight-meta {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
}

.meta-item {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.85rem;
    color: var(--stone-gray);
}

.meta-item i {
    font-size: 0.8rem;
}

/* ========== 联系方式 ========== */
.contact-section {
    padding: var(--spacing-xl) 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.contact-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 2rem;
    color: var(--dark-text);
}

.title-icon {
    font-size: 1.5rem;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.contact-icon {
    width: 40px;
    height: 40px;
    background: rgba(46, 139, 87, 0.1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-green);
    font-size: 1rem;
    flex-shrink: 0;
}

.contact-content h4 {
    margin-bottom: 0.25rem;
    color: var(--dark-text);
}

.contact-link {
    color: var(--primary-green);
    font-weight: 500;
    transition: var(--transition-fast);
}

.contact-link:hover {
    color: var(--deep-green);
}

.contact-content p {
    margin: 0.25rem 0;
    color: var(--stone-gray);
    font-size: 0.9rem;
}

.links-title {
    margin-bottom: 1.5rem;
    color: var(--dark-text);
    font-size: 1.3rem;
}

.profile-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.profile-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
    text-decoration: none;
    color: inherit;
}

.profile-link:hover {
    background: rgba(46, 139, 87, 0.05);
    transform: translateX(5px);
    border-color: rgba(46, 139, 87, 0.3);
}

.link-icon {
    width: 40px;
    height: 40px;
    background: rgba(46, 139, 87, 0.1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-green);
    font-size: 1.2rem;
    flex-shrink: 0;
}

.link-content {
    flex: 1;
}

.link-content h4 {
    margin-bottom: 0.25rem;
    color: var(--dark-text);
}

.link-content p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--stone-gray);
}

.link-arrow {
    color: var(--stone-gray);
    font-size: 0.9rem;
    opacity: 0.7;
    transition: var(--transition-fast);
}

.profile-link:hover .link-arrow {
    color: var(--primary-green);
    opacity: 1;
    transform: translateX(3px);
}

/* ========== 页脚 ========== */
.main-footer {
    background: var(--dark-text);
    color: white;
    padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
}

.footer-brand {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.footer-icon {
    font-size: 2rem;
    margin-top: 0.5rem;
}

.footer-brand-text h3 {
    color: white;
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

.footer-brand-text p {
    color: rgba(255, 255, 255, 0.7);
    margin: 0.25rem 0;
    font-size: 0.9rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.link-group h4 {
    color: white;
    margin-bottom: 1rem;
    font-size: 1rem;
}

.link-group a {
    display: block;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

.link-group a:hover {
    color: white;
    transform: translateX(5px);
}

.link-group a i {
    width: 20px;
    margin-right: 0.5rem;
    opacity: 0.7;
}

.footer-bottom {
    max-width: 1200px;
    margin: 3rem auto 0;
    padding: 2rem 2rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.7);
    margin: 0.5rem 0;
    font-size: 0.9rem;
}

.footer-motto {
    font-style: italic;
    color: rgba(255, 255, 255, 0.5);
}

/* ========== 响应式设计 ========== */
@media (max-width: 1024px) {
    .hero-container {
        gap: 3rem;
    }

    .contact-grid {
        gap: 3rem;
    }

    .footer-container {
        gap: 3rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .nav-menu-btn {
        display: block;
    }

    .hero-container {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }

    .hero-description {
        max-width: 100%;
        margin-left: auto;
        margin-right: auto;
    }

    .hero-actions {
        justify-content: center;
    }

    .image-container {
        max-width: 500px;
        margin: 0 auto;
    }

    .bio-grid {
        grid-template-columns: 1fr;
    }

    .highlights-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .footer-container {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .footer-links {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 1rem;
    }

    .hero-container {
        padding: 0 1rem;
    }

    .title-line {
        font-size: 2.5rem;
    }

    .bio-card {
        padding: 1.5rem;
    }

    .highlights-grid {
        grid-template-columns: 1fr;
    }

    .contact-item {
        flex-direction: column;
        gap: 0.5rem;
    }

    .profile-link {
        padding: 0.75rem;
    }
}