/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', '微软雅黑', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

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

/* 头部样式 */
.header {
    background: linear-gradient(135deg, #1e3c72, #2a5298);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.logo {
    display: flex;
    align-items: center;
    color: white;
}

.logo-img {
    width: 50px;
    height: 50px;
    margin-right: 15px;
    border-radius: 50%;
    background: rgba(255,255,255,0.1);
    padding: 5px;
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 600;
}

/* 导航样式 */
.nav-list {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-link {
    color: white;
    text-decoration: none;
    font-weight: 500;
    padding: 10px 15px;
    border-radius: 25px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    background: rgba(255,255,255,0.2);
    transform: translateY(-2px);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: #fff;
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 80%;
}

/* 主要内容区域 */
.main {
    min-height: calc(100vh - 120px);
}

/* 节标题 */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #2c3e50;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    width: 80px;
    height: 4px;
    background: linear-gradient(45deg, #3498db, #2980b9);
    transform: translateX(-50%);
    border-radius: 2px;
}

/* 卡片样式 */
.content-card {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.content-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(45deg, #3498db, #2980b9);
}

.content-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.15);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

.content-card h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 1.4rem;
}

.content-card p {
    color: #666;
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.card-link {
    display: inline-block;
    background: linear-gradient(45deg, #3498db, #2980b9);
    color: white;
    text-decoration: none;
    padding: 10px 25px;
    border-radius: 25px;
    transition: all 0.3s ease;
    font-weight: 500;
}

.card-link:hover {
    background: linear-gradient(45deg, #2980b9, #1e6091);
    transform: scale(1.05);
}

/* 底部样式 */
.footer {
    background: linear-gradient(135deg, #2c3e50, #34495e);
    color: white;
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-info h3 {
    margin-bottom: 1rem;
    color: #3498db;
}

.footer-links h4 {
    margin-bottom: 1rem;
    color: #3498db;
}

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

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: #3498db;
}

.footer-bottom {
    border-top: 1px solid #34495e;
    padding-top: 2rem;
    text-align: center;
}

.team-info {
    background: rgba(52, 73, 94, 0.5);
    border-radius: 10px;
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.team-info h4 {
    color: #3498db;
    margin-bottom: 1rem;
}

.team-info p {
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.copyright {
    color: #95a5a6;
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-list {
        flex-wrap: wrap;
        justify-content: center;
        gap: 15px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
}

/* 过渡效果 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.6s ease forwards;
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(45deg, #3498db, #2980b9);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(45deg, #2980b9, #1e6091);
}

/* 导航栏样式 */
.navbar {
    background: linear-gradient(135deg, #1a2c48 0%, #2a4365 100%);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    transition: all 0.3s ease;
}

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

.nav-logo {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: bold;
    color: #fff;
    text-decoration: none;
}

.nav-logo img {
    height: 40px;
    margin-right: 10px;
}

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

.nav-link {
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 50%;
    width: 0;
    height: 2px;
    background-color: #64b5f6;
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 80%;
}

/* 汉堡菜单 */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.hamburger .bar {
    width: 25px;
    height: 3px;
    background-color: #fff;
    margin: 3px 0;
    transition: 0.3s;
}

/* 主要内容 */
.main-content {
    margin-top: 80px;
    min-height: calc(100vh - 80px);
}

/* 章节标题 */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 3rem;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, #3498db, #2980b9);
    border-radius: 2px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: #fff;
    text-decoration: none;
    border-radius: 25px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    text-align: center;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(52, 152, 219, 0.3);
}

.cta-button {
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 25px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(231, 76, 60, 0.4);
    background: linear-gradient(135deg, #c0392b, #a93226);
}

/* 页脚样式 */
.footer {
    background: linear-gradient(135deg, #1a2c48 0%, #2c3e50 100%);
    color: #ecf0f1;
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

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

.footer-section h3 {
    color: #3498db;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.footer-section p {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: #3498db;
}

.footer-team {
    background-color: rgba(255, 255, 255, 0.05);
    padding: 1.5rem;
    border-radius: 10px;
    margin-bottom: 2rem;
    border-left: 4px solid #3498db;
}

.footer-team h3 {
    color: #3498db;
    margin-bottom: 1rem;
}

.team-info p {
    margin-bottom: 0.5rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #34495e;
    color: #95a5a6;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    opacity: 0;
    visibility: hidden;
    z-index: 1000;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(52, 152, 219, 0.3);
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.animate-fadeInUp {
    animation: fadeInUp 0.8s ease-out;
}

.animate-fadeInLeft {
    animation: fadeInLeft 0.8s ease-out;
}

.animate-fadeInRight {
    animation: fadeInRight 0.8s ease-out;
}

.animate-scaleIn {
    animation: scaleIn 0.6s ease-out;
}

/* 响应式设计 */
@media screen and (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 80px;
        flex-direction: column;
        background-color: #1a2c48;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        margin: 1rem 0;
    }

    .hamburger {
        display: flex;
    }

    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .container {
        padding: 0 15px;
    }

    .section-title {
        font-size: 2rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
        font-size: 1.3rem;
    }
}

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

    .section-title {
        font-size: 1.8rem;
    }

    .nav-logo {
        font-size: 1.3rem;
    }

    .footer-team {
        padding: 1rem;
    }
}