/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Arial, sans-serif;
}

/* 配色方案 */
:root {
    --primary-blue: #1A73E8;
    --secondary-teal: #26A69A;
    --accent-orange: #FF7043;
    --light-bg: #F8F9FA;
    --dark-text: #2D3436;
    --gradient-primary: linear-gradient(135deg, #1A73E8, #26A69A);
    --gradient-secondary: linear-gradient(135deg, #FF7043, #FFB74D);
    --border-radius: 16px;
    --box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

body {
    background: var(--light-bg);
    color: var(--dark-text);
    line-height: 1.6;
}

/* 导航栏样式 */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 1rem 5%;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
}

.navbar.hidden {
    transform: translateY(-100%);
    box-shadow: none;
}

.logo-container {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    margin-right: 10px;
}

.logo-text {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-blue);
}

.nav-menu {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-item {
    position: relative;
    padding: 1rem 0;
}

.nav-link {
    color: var(--dark-text);
    text-decoration: none;
    transition: color 0.3s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

/* 下拉菜单 */
.dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
    padding: 1rem;
    min-width: 220px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
}

.nav-item:hover .dropdown {
    opacity: 1;
    visibility: visible;
}

.dropdown-item {
    padding: 0.8rem 1rem;
    border-radius: 6px;
    transition: background 0.3s;
}

.dropdown-item:hover {
    background: var(--light-bg);
}

/* 关于我们内容 */
.about-content {
    padding: 8rem 5% 5rem;
    background: var(--light-bg);
}

.about-header {
    text-align: center;
    margin-bottom: 6rem;
    padding: 4rem 0;
    background: var(--gradient-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    position: relative;
    overflow: hidden;
}

.about-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('https://images.unsplash.com/photo-1583337130417-3346a1be7dee?ixlib=rb-1.2.1&auto=format&fit=crop&w=1950&q=80') center/cover;
    opacity: 0.1;
    z-index: 0;
}

.about-header h2 {
    font-size: 3.2rem;
    color: white;
    margin-bottom: 1.5rem;
    position: relative;
    display: inline-block;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.about-header p {
    font-size: 1.4rem;
    color: rgba(255, 255, 255, 0.9);
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.6;
    position: relative;
}

.about-logo {
    text-align: center;
    margin: -3rem auto 4rem;
    position: relative;
    z-index: 1;
}

.about-logo img {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    box-shadow: var(--box-shadow);
    border: 8px solid white;
    transition: transform 0.3s ease;
}

.about-logo img:hover {
    transform: scale(1.05);
}

/* 新版模块设计 */
.about-section {
    margin-bottom: 5rem;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
}

.section-header {
    padding: 2.5rem;
    background: var(--gradient-primary);
    color: white;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.section-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-secondary);
}

.section-header h3 {
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
    position: relative;
    z-index: 1;
}

.section-body {
    padding: 3rem;
}

.about-text {
    line-height: 1.8;
    margin-bottom: 2rem;
    color: var(--dark-text);
}

.about-image {
    text-align: center;
    margin: 2rem 0;
}

.about-image img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: transform 0.3s;
}

.about-image img:hover {
    transform: scale(1.02);
}

.image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.image-grid img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: transform 0.3s ease;
}

.image-grid img:hover {
    transform: translateY(-5px);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
    margin: 3rem 0;
}

.feature-card {
    background: white;
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: all 0.3s ease;
    text-align: center;
    border: 1px solid rgba(0, 0, 0, 0.05);
    position: relative;
    overflow: hidden;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.12);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-icon {
    font-size: 3rem;
    color: var(--primary-blue);
    margin-bottom: 1.5rem;
    background: rgba(26, 115, 232, 0.1);
    width: 90px;
    height: 90px;
    line-height: 90px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease;
}

.feature-card:hover .feature-icon {
    transform: scale(1.1);
}

.feature-title {
    font-size: 1.8rem;
    color: var(--primary-blue);
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 15px;
    text-align: center;
    width: 100%;
}

.feature-title:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 3px;
}

.feature-description {
    color: var(--dark-text);
    line-height: 1.7;
    margin-bottom: 1rem;
    font-size: 1.05rem;
    text-align: left;
    padding: 0 1rem;
    width: 100%;
}

.about-list {
    margin-left: 1.5rem;
    margin-bottom: 2rem;
}

.about-list li {
    margin-bottom: 1.2rem;
    position: relative;
    padding-left: 2rem;
    line-height: 1.6;
    list-style: none;
}

.about-list li:before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.5rem;
    width: 8px;
    height: 8px;
    background: var(--primary-blue);
    border-radius: 50%;
}

.about-list ul {
    margin-top: 0.8rem;
    margin-left: 1.5rem;
    list-style: none;
}

.about-list ul li {
    margin-bottom: 0.8rem;
    padding-left: 1.5rem;
}

.about-list ul li:before {
    width: 6px;
    height: 6px;
    top: 0.6rem;
}

.highlight-box {
    background: rgba(26, 115, 232, 0.05);
    border-left: 4px solid var(--primary-blue);
    padding: 2rem;
    margin: 2.5rem 0;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    transition: transform 0.3s ease;
}

.highlight-box:hover {
    transform: translateX(10px);
}

.highlight-box h4 {
    color: var(--primary-blue);
    margin-bottom: 1rem;
    font-size: 1.4rem;
}

.two-column {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.quote {
    font-style: italic;
    padding: 3rem;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    position: relative;
    margin: 4rem 0;
    border-left: 4px solid var(--primary-blue);
}

.quote:before {
    content: '"';
    position: absolute;
    top: 0;
    left: 2rem;
    font-size: 8rem;
    color: rgba(26, 115, 232, 0.1);
    line-height: 1;
    font-family: Georgia, serif;
}

.quote p {
    font-size: 1.3rem;
    color: var(--dark-text);
    line-height: 1.8;
    position: relative;
    z-index: 1;
}

.quote-author {
    text-align: right;
    font-weight: bold;
    margin-top: 1.5rem;
    color: var(--primary-blue);
    font-size: 1.1rem;
}

.stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2.5rem;
    margin: 4rem 0;
}

.stat-item {
    text-align: center;
    padding: 2.5rem;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: transform 0.3s ease;
    position: relative;
    overflow: hidden;
}

.stat-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 0;
}

.stat-item:hover {
    transform: translateY(-10px);
}

.stat-item:hover::before {
    opacity: 0.05;
}

.stat-number {
    font-size: 3.5rem;
    font-weight: bold;
    color: var(--primary-blue);
    margin-bottom: 0.8rem;
    position: relative;
    z-index: 1;
}

.stat-label {
    font-size: 1.2rem;
    color: var(--dark-text);
    position: relative;
    z-index: 1;
}

/* 团队贡献样式 */
.team-member-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.team-member-card {
    background: #ffffff;
    border-radius: 10px;
    padding: 2rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.team-member-card:hover {
    transform: translateY(-5px);
}

.member-name {
    color: var(--primary-blue);
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--primary-blue);
    padding-bottom: 0.5rem;
}

.member-contributions h5 {
    color: #333;
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.contribution-list {
    list-style-type: none;
    padding-left: 0;
}

.contribution-list li {
    margin-bottom: 0.8rem;
    position: relative;
    padding-left: 1.5rem;
}

.contribution-list li:before {
    content: "•";
    color: var(--primary-blue);
    font-size: 1.2em;
    position: absolute;
    left: 0;
}

.contribution-list ul {
    list-style-type: none;
    padding-left: 1.5rem;
    margin-top: 0.5rem;
}

.contribution-list ul li:before {
    content: "◦";
}

/* 响应式调整 */
@media (max-width: 768px) {
    .two-column {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .about-header h2 {
        font-size: 2.5rem;
    }
    
    .about-header p {
        font-size: 1.2rem;
    }
    
    .section-header h3 {
        font-size: 1.8rem;
    }
    
    .quote p {
        font-size: 1.1rem;
    }
    
    .team-member-grid {
        grid-template-columns: 1fr;
    }
    
    .team-member-card {
        padding: 1.5rem;
    }
}