:root {
    --primary-blue: #0066FF;
    --secondary-green: #00C389;
    --text-dark: #333333;
    --text-light: #666666;
    --bg-light: #F5F7FA;
    --white: #FFFFFF;
    --shadow: 0 4px 20px rgba(0, 102, 255, 0.1);
}

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

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

/* 顶部导航 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 70px;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 40px;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-blue);
}

.logo i {
    margin-right: 10px;
    font-size: 28px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-item {
    position: relative;
    font-size: 16px;
    color: var(--text-dark);
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.nav-item::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-blue);
    transition: width 0.3s ease;
}

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

.header-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}

.btn {
    padding: 8px 20px;
    border-radius: 25px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    outline: none;
}

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

.btn-primary:hover {
    background-color: #0052CC;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 102, 255, 0.3);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--primary-blue);
    color: var(--primary-blue);
}

.btn-outline:hover {
    background-color: var(--primary-blue);
    color: var(--white);
    transform: translateY(-2px);
}

/* Hero区域 */
.hero {
    margin-top: 70px;
    height: calc(100vh - 70px);
    background: linear-gradient(135deg, #f5f7fa 0%, #e9f1fb 100%);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 80px;
}

.hero-content {
    max-width: 500px;
    z-index: 10;
}

.hero-title {
    font-size: 48px;
    font-weight: bold;
    color: var(--primary-blue);
    line-height: 1.2;
    margin-bottom: 20px;
}

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

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

.hero-image {
    position: relative;
    width: 50%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-image img {
    max-width: 100%;
    max-height: 80%;
    border-radius: 20px;
    box-shadow: var(--shadow);
    animation: float 6s ease-in-out infinite;
}

/* 轮播图样式 */
.carousel-container {
    position: relative;
    width: 100%;
    height: 100%;
}

.carousel {
    width: 100%;
    height: 100%;
    position: relative;
}

.carousel-item {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 80px;
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
}

.carousel-item.active {
    opacity: 1;
    z-index: 10;
}

/* 轮播控制按钮 */
.carousel-control {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 20;
    color: var(--primary-blue);
    font-size: 24px;
}

.carousel-control:hover {
    background-color: var(--white);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transform: translateY(-50%) scale(1.1);
}

.carousel-control.prev {
    left: 20px;
}

.carousel-control.next {
    right: 20px;
}

/* 轮播指示点 */
.carousel-indicators {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 20;
}

.carousel-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: all 0.3s ease;
}

.carousel-indicator.active {
    background-color: var(--white);
    width: 30px;
    border-radius: 6px;
}

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

/* 波浪背景 - 使用CSS替代图片 */
.wave {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100px;
    background: linear-gradient(135deg, rgba(0,102,255,0.1) 0%, rgba(0,195,137,0.1) 100%);
    animation: wave-animation 15s linear infinite;
    border-radius: 50% 50% 0 0;
}

@keyframes wave-animation {
    0% { transform: translateX(0); }
    100% { transform: translateX(-1000px); }
}

/* 核心功能区 */
.features {
    padding: 80px 40px;
    background-color: var(--white);
}

.section-title {
    text-align: center;
    font-size: 36px;
    font-weight: bold;
    color: var(--primary-blue);
    margin-bottom: 60px;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background-color: var(--secondary-green);
    border-radius: 2px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    max-width: 1400px;
    margin: 0 auto;
}

/* 新增特色服务区块样式 */
.services {
    padding: 80px 40px;
    background-color: var(--bg-light);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    max-width: 1400px;
    margin: 0 auto;
}

.service-card {
    background-color: var(--white);
    border-radius: 15px;
    padding: 30px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(0, 102, 255, 0.15);
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background-color: var(--primary-blue);
}

.service-icon {
    font-size: 48px;
    color: var(--primary-blue);
    margin-bottom: 20px;
}

.service-title {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.service-description {
    font-size: 16px;
    color: var(--text-light);
    line-height: 1.6;
}

.feature-card {
    background-color: var(--white);
    border-radius: 15px;
    padding: 30px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(0, 102, 255, 0.15);
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background-color: var(--primary-blue);
}

.feature-icon {
    font-size: 48px;
    color: var(--primary-blue);
    margin-bottom: 20px;
}

.feature-title {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.feature-description {
    font-size: 16px;
    color: var(--text-light);
    line-height: 1.6;
}

/* 联盟与学科工坊 */
.alliance {
    padding: 80px 40px;
    background-color: var(--bg-light);
}

.alliance-container {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
    max-width: 1400px;
    margin: 0 auto;
}

.alliance-banner {
    flex: 1;
    min-width: 400px;
    background-color: var(--white);
    border-radius: 15px;
    padding: 40px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.workshops {
    flex: 1;
    min-width: 400px;
}

.workshop-tabs {
    background-color: var(--white);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.tab-header {
    display: flex;
    background-color: var(--bg-light);
}

.tab-item {
    flex: 1;
    padding: 15px 30px;
    text-align: center;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.tab-item.active {
    background-color: var(--primary-blue);
    color: var(--white);
}

.tab-content {
    padding: 30px;
}

/* 数据统计区 */
.stats {
    padding: 80px 40px;
    background-color: var(--primary-blue);
    color: var(--white);
    text-align: center;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    max-width: 1400px;
    margin: 0 auto;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 48px;
    font-weight: bold;
    margin-bottom: 10px;
    animation: countUp 2s ease-out forwards;
}

.stat-label {
    font-size: 16px;
    opacity: 0.9;
}

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

/* 页脚 */
.footer {
    background-color: var(--text-dark);
    color: var(--white);
    padding: 60px 40px 20px;
}

.footer-container {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
    max-width: 1400px;
    margin: 0 auto 40px;
}

.footer-column {
    flex: 1;
    min-width: 200px;
}

.footer-logo {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 20px;
    color: var(--white);
}

.footer-description {
    font-size: 14px;
    opacity: 0.8;
    margin-bottom: 20px;
}

.footer-title {
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 20px;
    color: var(--white);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: var(--white);
    opacity: 0.8;
    text-decoration: none;
    transition: opacity 0.3s ease;
}

.footer-links a:hover {
    opacity: 1;
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .hero {
        padding: 0 40px;
    }
    .hero-title {
        font-size: 36px;
    }
    .hero-subtitle {
        font-size: 20px;
    }
}

@media (max-width: 992px) {
    .header {
        padding: 0 20px;
    }
    .nav-menu {
        display: none;
    }
    .hero {
        flex-direction: column;
        text-align: center;
        padding: 40px 20px;
    }
    .hero-content {
        max-width: 100%;
        margin-bottom: 40px;
    }
    .hero-image {
        width: 100%;
    }
    .hero-cta {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .section-title {
        font-size: 28px;
    }
    .features,
    .alliance,
    .stats {
        padding: 60px 20px;
    }
    .alliance-container {
        flex-direction: column;
    }
}

@media (max-width: 576px) {
    .header {
        height: 60px;
    }
    .hero {
        margin-top: 60px;
        height: auto;
        min-height: calc(100vh - 60px);
    }
    .hero-title {
        font-size: 28px;
    }
    .hero-subtitle {
        font-size: 18px;
    }
    .btn {
        padding: 6px 16px;
        font-size: 12px;
    }
    .feature-card {
        padding: 20px;
    }
}