:root {
    --primary: #0066CC;
    --primary-dark: #003366;
    --accent: #00A0E9;
    --bg-light: #F8FAFC;
    --text-dark: #333333;
    --text-gray: #666666;
    --text-light: #999999;
    --white: #ffffff;
    --border: #E5E7EB;
    --shadow: 0 4px 20px rgba(0, 102, 204, 0.08);
    --shadow-hover: 0 8px 30px rgba(0, 102, 204, 0.15);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--bg-light);
}

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

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    z-index: 1000;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    font-size: 28px;
}

.logo-text {
    font-size: 18px;
    font-weight: 600;
    color: var(--primary-dark);
}

.nav {
    display: flex;
    gap: 30px;
}

.nav-link {
    font-size: 15px;
    color: var(--text-gray);
    transition: var(--transition);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
}

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

.mobile-menu-btn span {
    display: block;
    width: 25px;
    height: 2px;
    background: var(--text-dark);
    transition: var(--transition);
}

.mobile-menu {
    display: none;
    background: var(--white);
    padding: 20px;
    border-top: 1px solid var(--border);
}

.mobile-nav-link {
    display: block;
    padding: 12px 0;
    font-size: 16px;
    color: var(--text-dark);
    border-bottom: 1px solid var(--border);
}

.hero {
    position: relative;
    min-height: 310px;
    height: 310px;
    max-height: 560px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 70px;
    overflow: hidden;
    cursor: default;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    background-image: url('../image/banner.jpg');
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    transform: scale(1);
    transform-origin: center center;
    transition: transform 0.75s ease;
}

.hero:hover .hero-bg {
    transform: scale(1.08);
}

.hero-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    background:
        linear-gradient(180deg, rgba(0, 51, 102, 0.5) 0%, rgba(0, 51, 102, 0.28) 45%, rgba(0, 51, 102, 0.55) 100%);
}

@media (prefers-reduced-motion: reduce) {
    .hero-bg {
        transition: none;
    }

    .hero:hover .hero-bg {
        transform: scale(1);
    }
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--white);
    padding: 0 20px;
    text-shadow: 0 1px 18px rgba(0, 0, 0, 0.35);
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    letter-spacing: 2px;
}

.hero-subtitle {
    font-size: 20px;
    opacity: 0.95;
    margin-bottom: 30px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.btn {
    display: inline-block;
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 500;
    border-radius: var(--radius);
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

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

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

.section {
    padding: 90px 0 0 0;
}
.home-section {
    padding: 50px 0 ;
}

.section-header {
    margin-bottom: 30px;
}

.section-header.centered {
    text-align: center;
}

.section-title {
    font-size: 32px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 16px;
    color: var(--text-gray);
}

.about-preview, .team-preview {
    background: var(--white);
}

.research-desc strong {
    color: var(--primary);
}

.link-more {
    color: var(--primary);
    font-size: 15px;
    font-weight: 500;
    transition: var(--transition);
}

.link-more:hover {
    color: var(--primary-dark);
}

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

.research-card {
    background: var(--white);
    padding: 25px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: var(--transition);
}

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

.research-icon {
    font-size: 40px;
    margin-bottom: 15px;
}

.research-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.research-desc {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.7;
    margin-bottom: 16px;
}

.research-status {
    display: inline-block;
    padding: 4px 12px;
    font-size: 12px;
    font-weight: 500;
    border-radius: 20px;
    margin-bottom: 12px;
}

.status-active {
    background: rgba(0, 160, 233, 0.1);
    color: var(--accent);
}

.page-header {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    padding: 120px 0 60px;
    margin-top: 70px;
}

.page-title {
    font-size: 36px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 12px;
}

.page-breadcrumb {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
}

.content-card {
    background: var(--white);
    padding: 40px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 30px;
    border: 1px solid var(--border);
}

.content-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--primary);
    display: inline-block;
}

.content-body {
    color: var(--text-gray);
    line-height: 1.8;
}

.content-body p {
    margin-bottom: 16px;
}

.content-body p:last-child {
    margin-bottom: 0;
}

.research-areas {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-top: 25px;
}

.area-item {
    padding: 25px;
    background: var(--bg-light);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.area-item:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow);
}

.area-icon {
    margin-bottom: 15px;
    line-height: 0;
}

.area-icon-svg {
    width: 48px;
    height: 48px;
    display: block;
}

.area-item h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.area-item p {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.6;
}

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

.achievement-list li {
    padding: 12px 0;
    padding-left: 28px;
    position: relative;
    color: var(--text-gray);
    border-bottom: 1px solid var(--border);
}

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

.achievement-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 600;
}

.team-section {
    margin-bottom: 50px;
}

.team-section-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 25px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border);
}

.team-section-desc {
    color: var(--text-gray);
    margin-bottom: 25px;
    font-size: 15px;
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

.team-grid.single {
    max-width: 600px;
}

.team-grid.team-grid-2 {
    grid-template-columns: repeat(2, 1fr);
    max-width: none;
}

@media (max-width: 768px) {
    .team-grid.team-grid-2 {
        grid-template-columns: 1fr;
    }
}

.team-grid.team-grid-4 {
    grid-template-columns: repeat(4, 1fr);
    max-width: none;
}

@media (max-width: 1100px) {
    .team-grid.team-grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 560px) {
    .team-grid.team-grid-4 {
        grid-template-columns: 1fr;
    }
}

.team-card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    padding: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: var(--transition);
}

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

.team-page .team-card {
    position: relative;
    overflow: hidden;
    padding-top: 28px;
    align-items: stretch;
    text-align: left;
}

.team-page .team-card::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    height: 120px;
    z-index: 0;
    pointer-events: none;
    border-radius: var(--radius) var(--radius) 0 0;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 400 120' preserveAspectRatio='none'%3E%3Cdefs%3E%3ClinearGradient id='w' x1='0.08' y1='0' x2='1' y2='1'%3E%3Cstop offset='0' stop-color='%23F5FAFF' stop-opacity='0.98'/%3E%3Cstop offset='0.28' stop-color='%23E8F1FC'/%3E%3Cstop offset='1' stop-color='%23CFE3F5'/%3E%3C/linearGradient%3E%3C/defs%3E%3Cpath fill='url(%23w)' d='M0,0H400V22C345,81,275,27,200,70C148,106,102,90,0,112V0Z'/%3E%3C/svg%3E") center top / 100% 100% no-repeat;
}

.team-page .team-card .team-info {
    position: relative;
    z-index: 1;
}

.team-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 20px;
}

.team-avatar.leader {
    width: 100px;
    height: 100px;
    font-size: 28px;
}

.team-avatar.small {
    width: 70px;
    height: 70px;
    font-size: 12px;
}

.team-avatar.advisor {
    width: 90px;
    height: 90px;
    font-size: 20px;
}

.team-info {
    flex: 1;
}

.team-name {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 5px;
}

.team-title {
    font-size: 14px;
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 12px;
}

.team-desc {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.6;
}

.team-page .team-info {
    align-self: stretch;
    width: 100%;
}

.team-page .team-name {
    text-shadow: 0 1px 2px rgba(255, 255, 255, 0.95);
}

.team-page .team-title {
    margin-bottom: 0;
    text-shadow: 0 1px 2px rgba(255, 255, 255, 0.9);
}

.team-page .team-desc {
    text-align: left;
    margin-top: 25px;
    padding-top: 8px;
    text-shadow: none;
}

.team-page .container > .section-header + .team-section .team-grid.team-grid-2 {
    align-items: stretch;
}

.team-page .container > .section-header + .team-section .team-grid.team-grid-2 .team-card {
    height: 100%;
}

.about-experts .team-desc {
    text-align: left;
    width: 100%;
}

.research-list {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.research-detail-card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    overflow: hidden;
}

.research-detail-header {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    padding: 40px;
    display: flex;
    align-items: center;
    gap: 25px;
    color: var(--white);
}

.research-detail-icon {
    font-size: 50px;
}

.research-detail-title h3 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 10px;
}

.research-detail-body {
    padding: 40px;
}

.research-section {
    margin-bottom: 35px;
}

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

.research-section h4 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 18px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border);
}

.research-section p {
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 12px;
}

.challenge-list,
.goal-list,
.value-list {
    list-style: none;
}

.challenge-list li,
.goal-list li,
.value-list li {
    padding: 12px 0;
    padding-left: 28px;
    position: relative;
    color: var(--text-gray);
    line-height: 1.6;
}

.challenge-list li::before,
.goal-list li::before,
.value-list li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 600;
}

.module-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.module-card {
    padding: 25px;
    background: var(--bg-light);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.module-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow);
}

.module-icon {
    margin-bottom: 15px;
    line-height: 0;
}

.module-icon-svg {
    width: 48px;
    height: 48px;
    display: block;
}

.module-card h5 {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.module-card p {
    font-size: 13px;
    color: var(--text-gray);
    line-height: 1.6;
    margin-bottom: 0;
}

.module-card p + p {
    margin-top: 10px;
}

.module-card .module-card-list li {
    font-size: 13px;
    padding-top: 6px;
    padding-bottom: 6px;
}

.more-projects {
    text-align: center;
    padding: 50px;
    background: var(--bg-light);
    border-radius: var(--radius);
    border: 1px dashed var(--border);
    margin-top: 40px;
}

.more-projects h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.more-projects p {
    color: var(--text-gray);
}

.footer {
    background: var(--primary-dark);
    color: var(--white);
    padding: 15px 0 15px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 30px;
}

.footer-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 10px;
}

.footer-desc {
    opacity: 0.8;
    font-size: 14px;
}

.footer-contact {
    text-align: left;
    margin-left: auto;
    width: fit-content;
    max-width: 100%;
    display: flex;
    flex-direction: column;
    gap: 22px;
}

.footer-contact-block {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    gap: 14px;
}

.footer-contact-icon {
    width: 44px;
    height: 44px;
    flex-shrink: 0;
    border-radius: 10px;
    background: #e6f0ff;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
}

.footer-contact-icon svg {
    width: 22px;
    height: 22px;
}

.footer-contact-body {
    flex: 1;
    min-width: 0;
}

.footer-contact-label {
    font-size: 15px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.95);
    margin: 0 0 6px;
    line-height: 1.35;
}

.footer-contact-detail {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.72);
    line-height: 1.55;
    margin: 0 0 4px;
}

.footer-contact-detail:last-child {
    margin-bottom: 0;
}

.footer-contact-detail a {
    color: rgba(255, 255, 255, 0.85);
    text-decoration: underline;
    text-underline-offset: 3px;
    transition: var(--transition);
}

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

.footer-bottom {
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    opacity: 0.6;
}

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

    .mobile-menu-btn {
        display: flex;
    }

    .mobile-menu.active {
        display: block;
    }

    .hero {
        min-height: 360px;
        height: 42vh;
        max-height: 480px;
    }

    .hero-title {
        font-size: 32px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    .section {
        padding: 90px 0 0 0;
    }


    .home-section {
        padding: 50px 0;
    }

    .section-title {
        font-size: 26px;
    }

    .research-card,
    .content-card,
    .research-detail-body,
    .research-detail-header {
        padding: 25px;
    }

    .research-detail-header {
        flex-direction: column;
        text-align: center;
    }

    .research-detail-title h3 {
        font-size: 22px;
    }

    .research-areas,
    .module-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .footer-contact {
        text-align: left;
        align-self: flex-end;
        margin-left: 0;
    }
}