/* 全局样式 - 默认暗黑模式 */
:root {
    --primary-color: #0a192f;
    --secondary-color: #64ffda;
    --text-primary: #ccd6f6;
    --text-secondary: #8892b0;
    --white: #e6f1ff;
    --bg-color: #0a192f;
    --card-bg: rgba(10, 25, 47, 0.8);
    --footer-bg: #020c1b;
    --section-bg: rgba(100, 255, 218, 0.03);
    --header-bg: rgba(10, 25, 47, 0.9);
}

/* 亮色模式 */
[data-theme="light"] {
    --primary-color: #f8f9fa;
    --secondary-color: #007bff;
    --text-primary: #212529;
    --text-secondary: #495057;
    --white: #ffffff;
    --bg-color: #f8f9fa;
    --card-bg: rgba(255, 255, 255, 0.9);
    --footer-bg: #e9ecef;
    --section-bg: rgba(0, 123, 255, 0.03);
    --header-bg: rgba(248, 249, 250, 0.9);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

a {
    text-decoration: none;
    color: var(--secondary-color);
    transition: all 0.3s ease;
}

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

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

.btn {
    display: inline-block;
    padding: 12px 28px;
    background: transparent;
    color: var(--secondary-color);
    border: 1px solid var(--secondary-color);
    border-radius: 4px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn:hover {
    background: rgba(100, 255, 218, 0.1);
    transform: translateY(-3px);
}

[data-theme="light"] .btn:hover {
    background: rgba(0, 123, 255, 0.1);
}

/* 导航栏 */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--header-bg);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 20px 0;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--secondary-color);
}

.nav-links {
    display: flex;
    list-style: none;
    align-items: center;
}

.nav-links li {
    margin-left: 30px;
}

.nav-links a {
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 500;
}

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

.logo img {
    width: auto;
    height: 50px;
}

/* 汉堡菜单按钮 */
.hamburger {
    display: none;
    cursor: pointer;
    width: 30px;
    height: 21px;
    position: relative;
    z-index: 1001;
    background: none;
    border: none;
    padding: 0;
}

.hamburger span {
    display: block;
    position: absolute;
    height: 3px;
    width: 100%;
    background: var(--text-primary);
    border-radius: 3px;
    opacity: 1;
    left: 0;
    transform: rotate(0deg);
    transition: .25s ease-in-out;
}

.hamburger span:nth-child(1) {
    top: 0;
}

.hamburger span:nth-child(2),
.hamburger span:nth-child(3) {
    top: 9px;
}

.hamburger span:nth-child(4) {
    top: 18px;
}

.hamburger.open span:nth-child(1) {
    top: 9px;
    width: 0%;
    left: 50%;
}

.hamburger.open span:nth-child(2) {
    transform: rotate(45deg);
}

.hamburger.open span:nth-child(3) {
    transform: rotate(-45deg);
}

.hamburger.open span:nth-child(4) {
    top: 9px;
    width: 0%;
    left: 50%;
}
/* 主题切换开关 */
.theme-switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 30px;
    margin-left: 20px;
}

.theme-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 22px;
    width: 22px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked+.slider {
    background-color: var(--secondary-color);
}

input:checked+.slider:before {
    transform: translateX(30px);
}

.slider .icon {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: 14px;
    color: white;
}

.slider .moon {
    left: 8px;
}

.slider .sun {
    right: 8px;
}

/* 移动端导航菜单 */
.mobile-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 300px;
    height: 100vh;
    background: var(--header-bg);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 80px 30px 30px;
    transition: right 0.3s ease;
    overflow-y: auto;
}

.mobile-nav.open {
    right: 0;
}

.mobile-nav-links {
    list-style: none;
}

.mobile-nav-links li {
    margin-bottom: 20px;
}

.mobile-nav-links a {
    color: var(--text-primary);
    font-size: 18px;
    display: block;
    padding: 10px 0;
}

.mobile-nav-links a:hover {
    color: var(--secondary-color);
}

.mobile-theme-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--text-secondary);
}

.mobile-theme-toggle span {
    color: var(--text-primary);
    font-size: 16px;
}

/* 页面标题区域 */
.page-header {
    padding: 150px 0 80px;
    text-align: center;
    background: linear-gradient(to right, rgba(10, 25, 47, 0.9), rgba(10, 25, 47, 0.7));
    position: relative;
    overflow: hidden;
}

[data-theme="light"] .page-header {
    background: linear-gradient(to right, rgba(248, 249, 250, 0.9), rgba(248, 249, 250, 0.7));
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('images/about-bg.jpg') center/cover no-repeat;
    z-index: -1;
    opacity: 0.2;
}

.page-title {
    font-size: 48px;
    margin-bottom: 20px;
    color: var(--secondary-color);
}

.page-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto;
}

/* 内容区域 */
.content-section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 60px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 3px;
    background: var(--secondary-color);
    margin: 15px auto 0;
}

.section-description {
    max-width: 800px;
    margin: 0 auto 50px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 18px;
}

/* 协会简介 */
.about-intro {
    display: flex;
    align-items: center;
    gap: 50px;
    margin-bottom: 60px;
}

.about-image {
    flex: 1;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.about-image img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.5s ease;
}

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

.about-text {
    flex: 1;
}

.about-text h3 {
    font-size: 28px;
    margin-bottom: 20px;
    color: var(--secondary-color);
}

.about-text p {
    margin-bottom: 15px;
    line-height: 1.8;
}

/* 组织架构 */
.org-structure {
    background: var(--section-bg);
    padding: 80px 0;
}

.org-chart {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    margin-top: 50px;
}

.org-level {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    width: 100%;
    position: relative;
    margin-bottom: 20px;
}

.org-node {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    width: 200px;
    margin: 0 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    position: relative;
    z-index: 1;
}

.org-node h4 {
    color: var(--secondary-color);
    margin-bottom: 10px;
    font-size: 18px;
}

.org-node p {
    color: var(--text-secondary);
    font-size: 14px;
    margin: 0;
}

/* 垂直连接线 */
.org-connection.vertical {
    width: 2px;
    height: 30px;
    background: var(--secondary-color);
    margin: 0 auto;
    position: relative;
}

/* 水平连接线（用于副会长到各部门） */
.org-connections.horizontal {
    display: flex;
    justify-content: center;
    width: 100%;
    position: relative;
    height: 30px;
    margin: 10px 0;
}

.org-connections.horizontal .org-connection {
    flex: 1;
    max-width: 100px;
    height: 2px;
    background: var(--secondary-color);
    position: relative;
    margin: 0 5px;
}

/* 连接线箭头 */
.org-connection::after {
    content: '';
    position: absolute;
    width: 8px;
    height: 8px;
    border-right: 2px solid var(--secondary-color);
    border-bottom: 2px solid var(--secondary-color);
    transform: rotate(45deg);
    bottom: -4px;
    right: 0;
}

.org-connection.vertical::after {
    right: -3px;
    bottom: 0;
    transform: rotate(45deg);
}

/* 响应式设计 - 小屏幕改为垂直排列 */
@media (max-width: 768px) {
    .org-level {
        flex-direction: column;
        align-items: center;
        margin-bottom: 0;
    }
    
    .org-node {
        margin: 0 0 30px 0;
    }
    
    .org-connection.vertical {
        height: 20px;
        width: 2px;
    }
    
    .org-connections.horizontal {
        display: none;
    }
    
    /* 移动端连接线 */
    .org-node::after {
        content: '';
        position: absolute;
        bottom: -15px;
        left: 50%;
        transform: translateX(-50%);
        width: 2px;
        height: 15px;
        background: var(--secondary-color);
    }
    
    .org-node:last-child::after {
        display: none;
    }
}


/* 发展历程 */
.timeline {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
    padding: 40px 0;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    width: 2px;
    height: 100%;
    background: var(--secondary-color);
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    margin-bottom: 50px;
    width: 100%;
}

.timeline-item:nth-child(odd) {
    padding-right: 50%;
    text-align: right;
}

.timeline-item:nth-child(even) {
    padding-left: 50%;
    text-align: left;
}

.timeline-content {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    position: relative;
}

.timeline-content::before {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    background: var(--secondary-color);
    border-radius: 50%;
    top: 20px;
}

.timeline-item:nth-child(odd) .timeline-content::before {
    right: -60px;
}

.timeline-item:nth-child(even) .timeline-content::before {
    left: -60px;
}

.timeline-date {
    color: var(--secondary-color);
    font-weight: bold;
    margin-bottom: 10px;
}

.timeline-title {
    font-size: 20px;
    margin-bottom: 10px;
}

.timeline-desc {
    color: var(--text-secondary);
}

/* 荣誉展示 */
.honors {
    background: var(--section-bg);
    padding: 80px 0;
}

.honors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.honor-card {
    background: var(--card-bg);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.honor-card:hover {
    transform: translateY(-10px);
}

.honor-image {
    height: 200px;
    overflow: hidden;
}

.honor-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.honor-card:hover .honor-image img {
    transform: scale(1.1);
}

.honor-content {
    padding: 20px;
}

.honor-title {
    font-size: 20px;
    margin-bottom: 10px;
}

.honor-date {
    color: var(--secondary-color);
    font-size: 14px;
    margin-bottom: 10px;
}

.honor-desc {
    color: var(--text-secondary);
    font-size: 15px;
}

/* 页脚 */
footer {
    background: var(--footer-bg);
    padding: 50px 0 20px;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    list-style: none;
    margin-bottom: 30px;
}

.footer-links li {
    margin: 0 15px;
}

.copyright {
    color: var(--text-secondary);
    font-size: 14px;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .about-intro {
        flex-direction: column;
    }

    .about-image {
        width: 100%;
    }

    .nav-links {
        display: none;
    }

    .hamburger {
        display: block;
    }
}

@media (max-width: 768px) {
    .page-title {
        font-size: 36px;
    }

    .page-subtitle {
        font-size: 16px;
    }

    .section-title {
        font-size: 28px;
    }

    .timeline::before {
        left: 30px;
    }

    .timeline-item:nth-child(odd),
    .timeline-item:nth-child(even) {
        padding: 0 0 0 70px;
        text-align: left;
    }

    .timeline-item:nth-child(odd) .timeline-content::before,
    .timeline-item:nth-child(even) .timeline-content::before {
        left: 20px;
    }

    .honors-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .page-title {
        font-size: 32px;
    }

    .theme-switch {
        width: 50px;
        height: 25px;
        margin-left: 15px;
    }

    .slider:before {
        height: 18px;
        width: 18px;
        bottom: 3.5px;
        left: 3.5px;
    }

    input:checked+.slider:before {
        transform: translateX(25px);
    }

    .slider .icon {
        font-size: 12px;
    }
}

.close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 24px;
    cursor: pointer;
    z-index: 1001;
}

.close-btn:hover {
    color: var(--secondary-color);
}