/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 根元素样式 */
:root {
    --primary-color: #1a365d;
    --secondary-color: #c2410c;
    --accent-color: #f59e0b;
    --light-color: #f8fafc;
    --dark-color: #1e293b;
    --transition: all 0.3s ease;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

/* 基础样式 */
body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: var(--light-color);
    overflow-x: hidden;
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* 加载动画 */
.loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--light-color);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loader--hidden {
    opacity: 0;
    visibility: hidden;
}

.loader__logo {
    margin-bottom: 2rem;
}

.loader__text {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.loader__progress {
    width: 200px;
    height: 4px;
    background-color: #e2e8f0;
    border-radius: 2px;
    overflow: hidden;
}

.loader__progress-bar {
    height: 100%;
    background-color: var(--primary-color);
    width: 0;
    transition: width 0.3s ease;
}

/* 顶部导航栏 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow);
    z-index: 1000;
    transition: var(--transition);
}

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

.header__logo {
    display: block;
}

.header__logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.header__nav-list {
    display: flex;
    list-style: none;
}

.header__nav-item {
    margin-left: 2rem;
}

.header__nav-link {
    font-weight: 500;
    color: var(--dark-color);
    transition: var(--transition);
    position: relative;
}

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

.header__nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

.header__nav-link:hover::after {
    width: 100%;
}

.header__mobile-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.header__mobile-icon {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--dark-color);
    position: relative;
    transition: var(--transition);
}

.header__mobile-icon::before,
.header__mobile-icon::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background-color: var(--dark-color);
    transition: var(--transition);
}

.header__mobile-icon::before {
    top: -6px;
}

.header__mobile-icon::after {
    bottom: -6px;
}

/* 主体内容区 */
.main {
    margin-top: 0px;
}

/* 校区部分 */
.campus-section {
    min-height: calc(100vh - 120px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    margin: 0;
    width: 100%;
}

.campus-container {
    display: flex;
    width: 100%;
    position: relative;
    gap: -5%; /* 负间距实现重叠效果 */
    margin: 0;
    padding: 0;
}

/* 校区卡片基础样式 */
.campus-card {
    flex: 1;
    position: relative;
    height: 70vh;
    min-height: 800px;
    max-height: 1000px;
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50%;
}

/* 左侧校区卡片 */
.campus-card--left {
    margin-right: -5%;
    z-index: 2;
}

/* 右侧校区卡片 */
.campus-card--right {
    z-index: 1;
}

/* 卡片占位符 */
.campus-card__placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transition: var(--transition);
}

.campus-card__placeholder--left {
    background: linear-gradient(135deg, #f59e0b, #d97706);
}

.campus-card__placeholder--right {
    background: linear-gradient(135deg, #1a365d, #2563eb);
}

/* 校区图片 */
.campus-card__image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
    opacity: 0;
}

.campus-card__image--loaded {
    opacity: 1;
}

/* 渐变蒙版 */
.campus-card__overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transition: var(--transition);
}

.campus-card__overlay--left {
    background: linear-gradient(to right, rgba(0, 0, 0, 0.4), transparent);
}

.campus-card__overlay--right {
    background: linear-gradient(to left, rgba(0, 0, 0, 0.4), transparent);
}

/* 卡片内容 */
.campus-card__content {
    position: relative;
    z-index: 10;
    color: white;
    text-align: center;
    padding: 2rem;
    transition: var(--transition);
}

.campus-card--left .campus-card__content {
    text-align: left;
    margin-right: 20%;
}

.campus-card--right .campus-card__content {
    text-align: right;
    margin-left: 20%;
}

.campus-card__title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.campus-card__description {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.campus-card__arrow {
    display: inline-block;
    font-size: 1.5rem;
    font-weight: 700;
    transition: var(--transition);
    opacity: 0.8;
}

/* 卡片悬停效果 */
.campus-card:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
    z-index: 10;
}

.campus-card:hover .campus-card__arrow {
    transform: translateX(10px);
    opacity: 1;
}

.campus-card--right:hover .campus-card__arrow {
    transform: translateX(-10px);
}

/* 关于我们部分 */
.about-section {
    padding: 1rem 2rem;
    background-color: #f1f5f9;
}

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

.about-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 2rem;
    text-align: center;
}

.about-text {
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
    text-align: justify-all;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

/* 新闻动态部分 */
.news-section {
    padding: 5rem 2rem;
}

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

.news-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 3rem;
    text-align: center;
}

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

.news-item {
    background-color: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    padding: 1.5rem;
}

.news-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.news-item__title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.news-item__date {
    font-size: 0.875rem;
    color: #64748b;
    margin-bottom: 1rem;
}

.news-item__summary {
    font-size: 1rem;
    color: var(--dark-color);
}

/* 页脚信息 */
.footer {
    background-color: var(--primary-color);
    color: white;
    padding: 3rem 2rem 2rem;
}

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

.footer-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 2rem;
}

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

.footer-info__title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.footer-info__text {
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.footer-copyright {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .campus-container {
        gap: 0;
    }
    
    .campus-card--left {
        margin-right: -2%;
    }
    
    .campus-card__title {
        font-size: 2rem;
    }
    
    .campus-card__description {
        font-size: 1.125rem;
    }
    
    .campus-card--left .campus-card__content {
        margin-right: 10%;
    }
    
    .campus-card--right .campus-card__content {
        margin-left: 10%;
    }
}

@media (max-width: 768px) {
    .header__nav {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background-color: white;
        box-shadow: var(--shadow);
        padding: 1rem 0;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .header__nav--active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .header__nav-list {
        flex-direction: column;
        align-items: center;
    }
    
    .header__nav-item {
        margin: 0.5rem 0;
    }
    
    .header__mobile-toggle {
        display: block;
    }
    
    .campus-container {
        flex-direction: column;
        gap: 2rem;
    }
    
    .campus-card {
        width: 100%;
        height: 50vh;
        min-height: 400px;
    }
    
    .campus-card--left {
        margin-right: 0;
    }
    
    .campus-card__overlay--left,
    .campus-card__overlay--right {
        background: linear-gradient(to bottom, rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.7));
    }
    
    .campus-card__content {
        text-align: center !important;
        margin: 0 !important;
    }
    
    .campus-card:hover {
        transform: scale(1.02);
    }
    
    .campus-card:hover .campus-card__arrow {
        transform: translateY(10px) !important;
    }
    
    .footer-info {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .footer-info__item {
        margin-bottom: 1.5rem;
    }
}

@media (max-width: 480px) {
    .campus-card__title {
        font-size: 1.75rem;
    }
    
    .campus-card__description {
        font-size: 1rem;
    }
    
    .about-title,
    .news-title {
        font-size: 2rem;
    }
    
    .about-text {
        font-size: 1rem;
    }
}

/* 焦点样式 */
.campus-card:focus {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

/* 动画类 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.8s ease forwards;
}

/* 加载失败提示 */
.campus-card__error {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 1.25rem;
    font-weight: 500;
    text-align: center;
    z-index: 5;
}