/* 基本样式设置 */
:root {
    --primary-color: #c12c1f;
    --secondary-color: #e8c872;
    --background-color: #f9f5e9;
    --text-color: #333333;
    --light-color: #ffffff;
    --dark-color: #222222;
    --section-padding: 60px 0;
    --transition: all 0.3s ease;
}

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

body {
    font-family: "Microsoft YaHei", "SimSun", sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    overflow-x: hidden;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 15px;
    color: var(--primary-color);
}

p {
    margin-bottom: 15px;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--secondary-color);
}

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

.section {
    padding: var(--section-padding);
}

.section-title {
    text-align: center;
    margin-bottom: 40px;
    position: relative;
    font-size: 2.5rem;
}

.section-title::after {
    content: "";
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background-color: var(--primary-color);
}

.section-content {
    margin-top: 30px;
}

.bg-light {
    background-color: #f0ebe0;
}

.lead {
    font-size: 1.2rem;
    font-weight: 300;
    margin-bottom: 30px;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    background-color: var(--primary-color);
    color: var(--light-color);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn:hover {
    background-color: var(--secondary-color);
    color: var(--dark-color);
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--primary-color);
    color: var(--light-color);
    padding: 15px 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--light-color);
    margin: 0;
}

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

.nav-menu li {
    margin-left: 20px;
}

.nav-menu a {
    color: var(--light-color);
    font-weight: 500;
    padding: 5px 10px;
    border-radius: 4px;
    transition: var(--transition);
}

.nav-menu a:hover, .nav-menu a.active {
    background-color: var(--secondary-color);
    color: var(--dark-color);
}

.menu-toggle {
    display: none;
    cursor: pointer;
    font-size: 1.5rem;
}

/* 头部横幅样式 */
.hero {
    height: 100vh;
    background-image: url('images/1950_labor_day_tiananmen_square.jpeg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--light-color);
    margin-top: 70px;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(193, 44, 31, 0.7);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    padding: 0 20px;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    color: var(--light-color);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
}

/* 卡片样式 */
.card {
    background-color: var(--light-color);
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    padding: 30px;
    margin-bottom: 30px;
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.card h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
}

/* 图文容器样式 */
.image-text-container {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    margin: 30px 0;
    gap: 30px;
}

.text-content {
    flex: 1;
    min-width: 300px;
}

.image-content {
    flex: 1;
    min-width: 300px;
    text-align: center;
}

.image-content img {
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    margin: 0 auto;
}

.image-caption {
    font-style: italic;
    color: #666;
    margin-top: 10px;
    font-size: 0.9rem;
}

/* 时间线样式 */
.timeline {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
}

.timeline::after {
    content: '';
    position: absolute;
    width: 6px;
    background-color: var(--primary-color);
    top: 0;
    bottom: 0;
    left: 50px;
    margin-left: -3px;
}

.timeline-item {
    padding: 10px 40px;
    position: relative;
    background-color: inherit;
    width: 100%;
    margin-bottom: 30px;
}

.timeline-date {
    position: absolute;
    width: 80px;
    height: 80px;
    background-color: var(--primary-color);
    color: var(--light-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    left: 0;
    z-index: 1;
}

.timeline-date span {
    font-weight: bold;
    font-size: 0.9rem;
}

.timeline-content {
    padding: 20px 30px;
    background-color: var(--light-color);
    position: relative;
    border-radius: 6px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    margin-left: 60px;
}

.timeline-content h3 {
    margin-top: 0;
}

/* 庆祝活动列表样式 */
.celebration-list {
    list-style: none;
    margin: 20px 0;
}

.celebration-list li {
    margin-bottom: 15px;
    padding-left: 25px;
    position: relative;
}

.celebration-list li::before {
    content: "•";
    color: var(--primary-color);
    font-weight: bold;
    font-size: 1.5rem;
    position: absolute;
    left: 0;
    top: -5px;
}

/* 劳动竞赛网格样式 */
.competition-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    margin: 40px 0;
}

.competition-item {
    background-color: var(--light-color);
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    padding: 25px;
    display: flex;
    align-items: flex-start;
    transition: var(--transition);
}

.competition-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.competition-icon {
    font-size: 2rem;
    color: var(--primary-color);
    margin-right: 20px;
    min-width: 40px;
    text-align: center;
}

.competition-content h3 {
    margin-top: 0;
    margin-bottom: 10px;
}

.conclusion {
    text-align: center;
    font-size: 1.2rem;
    font-weight: 500;
    margin-top: 40px;
    color: var(--primary-color);
}

/* 历史意义网格样式 */
.significance-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 30px;
    margin: 40px 0;
}

.significance-card {
    background-color: var(--light-color);
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    padding: 30px;
    text-align: center;
    transition: var(--transition);
}

.significance-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
    background-color: var(--primary-color);
    color: var(--light-color);
}

.significance-card:hover h3 {
    color: var(--light-color);
}

.significance-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.significance-card:hover .significance-icon {
    color: var(--secondary-color);
}

.significance-card h3 {
    margin-bottom: 15px;
}

/* 图片展示区样式 */
.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    margin: 40px 0;
}

.gallery-item {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    cursor: pointer;
    transition: var(--transition);
}

.gallery-item:hover {
    transform: scale(1.03);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.gallery-image {
    width: 100%;
    height: 250px;
    object-fit: cover;
    transition: var(--transition);
}

.gallery-item:hover .gallery-image {
    transform: scale(1.1);
}

.gallery-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: rgba(0, 0, 0, 0.7);
    color: var(--light-color);
    padding: 15px;
    transform: translateY(100%);
    transition: var(--transition);
}

.gallery-item:hover .gallery-caption {
    transform: translateY(0);
}

.gallery-caption h3 {
    color: var(--light-color);
    margin-bottom: 5px;
    font-size: 1.2rem;
}

.gallery-caption p {
    font-size: 0.9rem;
    margin-bottom: 0;
}

/* 结语样式 */
.conclusion-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    padding: 30px;
    background-color: var(--light-color);
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.conclusion-content h2 {
    color: var(--primary-color);
    margin-bottom: 20px;
}

.conclusion-content p {
    font-size: 1.1rem;
    line-height: 1.8;
}

/* 页脚样式 */
.footer {
    background-color: var(--dark-color);
    color: var(--light-color);
    padding: 60px 0 20px;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    margin-bottom: 40px;
}

.footer-section {
    flex: 1;
    min-width: 300px;
    margin-bottom: 30px;
    padding-right: 30px;
}

.footer-section h3 {
    color: var(--secondary-color);
    margin-bottom: 20px;
    font-size: 1.3rem;
}

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

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

.copyright {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* 返回顶部按钮样式 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: var(--light-color);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

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

.back-to-top:hover {
    background-color: var(--secondary-color);
    color: var(--dark-color);
    transform: translateY(-5px);
}

/* 图片查看器样式 */
.image-viewer {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    overflow: auto;
}

.image-viewer .image-content {
    margin: auto;
    display: block;
    max-width: 90%;
    max-height: 80%;
    margin-top: 60px;
}

.image-viewer .caption {
    margin: auto;
    display: block;
    width: 80%;
    max-width: 700px;
    text-align: center;
    color: #ccc;
    padding: 10px 0;
    height: 150px;
}

.image-viewer .close {
    position: absolute;
    top: 15px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    transition: 0.3s;
    cursor: pointer;
}

.image-viewer .close:hover,
.image-viewer .close:focus {
    color: #bbb;
    text-decoration: none;
    cursor: pointer;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .hero-content h1 {
        font-size: 2.8rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .timeline::after {
        left: 31px;
    }
}

@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background-color: var(--primary-color);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 20px 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu li {
        margin: 10px 0;
    }
    
    .hero-content h1 {
        font-size: 2.2rem;
    }
    
    .hero-content p {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .timeline-date {
        width: 60px;
        height: 60px;
        font-size: 0.8rem;
    }
    
    .timeline-content {
        margin-left: 40px;
    }
    
    .competition-grid,
    .significance-grid,
    .gallery {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
    }
    
    .footer-section {
        padding-right: 0;
    }
}

@media (max-width: 576px) {
    .logo {
        font-size: 1.2rem;
    }
    
    .hero-content h1 {
        font-size: 1.8rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .card,
    .timeline-content,
    .competition-item,
    .significance-card {
        padding: 15px;
    }
    
    .back-to-top {
        width: 40px;
        height: 40px;
        font-size: 1rem;
        bottom: 20px;
        right: 20px;
    }
}