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

:root {
    --primary-color: #1a73e8;
    --secondary-color: #4285f4;
    --accent-color: #fbbc05;
    --dark-color: #202124;
    --light-color: #f8f9fa;
    --gray-color: #5f6368;
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    color: var(--dark-color);
    line-height: 1.6;
    background-color: #ffffff;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

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

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

ul {
    list-style: none;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    background-color: var(--primary-color);
    color: white;
    border-radius: var(--border-radius);
    font-weight: 500;
    font-size: 16px;
    transition: var(--transition);
    cursor: pointer;
    box-shadow: 0 2px 10px rgba(26, 115, 232, 0.3);
}

.btn:hover {
    background-color: var(--secondary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(26, 115, 232, 0.4);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

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

.btn-large {
    padding: 16px 40px;
    font-size: 18px;
}

/* 页头样式 */
header {
    background-color: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 15px 0;
}

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

.logo h1 {
    font-size: 22px;
    font-weight: 600;
    color: var(--primary-color);
}

.english-name {
    font-size: 14px;
    color: var(--gray-color);
    margin-top: -5px;
}

nav ul {
    display: flex;
    gap: 30px;
}

nav ul li a {
    font-weight: 500;
    color: var(--dark-color);
    position: relative;
}

nav ul li a:after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

nav ul li a:hover {
    color: var(--primary-color);
}

nav ul li a:hover:after {
    width: 100%;
}

/* 英雄区块样式 */
.hero {
    background: linear-gradient(135deg, #1a73e8 0%, #4285f4 100%);
    color: white;
    padding: 100px 0 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero.enhanced {
    padding: 120px 0 100px;
    background: linear-gradient(135deg, #0d47a1 0%, #1976d2 50%, #42a5f5 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
    animation: fadeIn 1s ease-out;
}

.main-title {
    font-size: 52px;
    font-weight: 800;
    margin-bottom: 30px;
    letter-spacing: 1px;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.divider {
    width: 100%;
    max-width: 200px;
    margin: 0 auto 30px;
    height: 2px;
    background: rgba(255, 255, 255, 0.3);
    position: relative;
}

.divider span {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    background-color: var(--primary-color);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 0 5px rgba(255, 255, 255, 0.2);
}

.divider i {
    font-size: 18px;
}

.hero .highlight-text {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 20px;
    color: white;
    text-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.org-english-name {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 20px;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.hero-description {
    font-size: 24px;
    margin-bottom: 40px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

.wave-decoration {
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 50px;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 100"><path fill="white" fill-opacity="1" d="M0,32L60,42.7C120,53,240,75,360,74.7C480,75,600,53,720,48C840,43,960,53,1080,58.7C1200,64,1320,64,1380,64L1440,64L1440,100L1380,100C1320,100,1200,100,1080,100C960,100,840,100,720,100C600,100,480,100,360,100C240,100,120,100,60,100L0,100Z"></path></svg>') no-repeat;
    background-size: cover;
}

.hero .cta {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-top: 40px;
}

.hero .btn {
    padding: 15px 35px;
    font-size: 18px;
    font-weight: 600;
    border-radius: 30px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    transition: all 0.4s ease;
}

.hero .btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.hero .btn-outline {
    border-color: white;
    color: white;
    border-width: 2px;
}

.hero .btn-outline:hover {
    background-color: white;
    color: var(--primary-color);
}

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

/* 特色区块样式 */
.features {
    padding: 80px 0;
    background-color: var(--light-color);
}

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

.section-title:after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: var(--accent-color);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-item {
    background-color: white;
    padding: 30px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 40px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.feature-item h3 {
    font-size: 22px;
    margin-bottom: 15px;
}

/* 加入我们区块样式 */
.join-us {
    padding: 100px 0;
    text-align: center;
    background-color: white;
}

.logo-container {
    margin-bottom: 30px;
}

.association-logo {
    max-width: 450px;
    height: auto;
}

.highlight-text {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 25px;
}

.join-us p {
    font-size: 18px;
    max-width: 700px;
    margin: 0 auto 40px;
}

/* 新闻区块样式 */
.news {
    padding: 80px 0;
    background-color: var(--light-color);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.news-item {
    background-color: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    padding: 20px;
}

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

.news-item h3 {
    font-size: 20px;
    margin-bottom: 10px;
}

.news-item p {
    color: var(--gray-color);
    margin-bottom: 15px;
}

.read-more {
    font-weight: 500;
    display: inline-block;
    padding-bottom: 2px;
    border-bottom: 2px solid var(--primary-color);
}

/* 页脚样式 */
footer {
    background-color: var(--dark-color);
    color: white;
    padding: 30px 0;
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.copyright p {
    color: #cccccc;
    font-size: 14px;
    margin: 5px 0;
}

.icp-link {
    color: #cccccc;
    text-decoration: none;
    transition: color 0.3s ease;
}

.icp-link:hover {
    color: #ffffff;
    text-decoration: underline;
}

.social-links {
    display: flex;
    gap: 20px;
}

.social-links a, .social-links .wechat-icon, .social-links .qq-icon {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 18px;
    transition: var(--transition);
    cursor: pointer;
}

.social-links a:hover, .social-links .wechat-icon:hover, .social-links .qq-icon:hover {
    background-color: var(--primary-color);
    transform: translateY(-3px);
}

/* QQ和微信图标悬停二维码 */
.qq-icon, .wechat-icon {
    position: relative;
}

.qrcode-popup {
    position: absolute;
    bottom: 50px;
    left: 50%;
    transform: translateX(-50%) scale(0.8);
    background-color: white;
    padding: 10px;
    border-radius: 8px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
    text-align: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 10;
}

.qrcode-popup img {
    width: 150px;
    height: 150px;
    display: block;
}

.qrcode-popup p {
    color: var(--dark-color);
    font-size: 14px;
    margin-top: 8px;
    font-weight: 500;
}

.qq-icon:hover .qrcode-popup, .wechat-icon:hover .qrcode-popup {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) scale(1);
}

/* 添加小三角形指示 */
.qrcode-popup:after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 10px solid transparent;
    border-right: 10px solid transparent;
    border-top: 10px solid white;
}

/* 页面头部样式 */
.page-header {
    background: linear-gradient(135deg, #1a73e8 0%, #4285f4 100%);
    color: white;
    padding: 60px 0;
    text-align: center;
}

.page-header h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 10px;
}

.page-header p {
    font-size: 18px;
    max-width: 600px;
    margin: 0 auto;
}

/* 关于我们页面样式 */
.about-content {
    padding: 80px 0;
}

.about-grid {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 50px;
    margin-bottom: 80px;
}

.about-text h3 {
    font-size: 24px;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.about-text p {
    margin-bottom: 25px;
    font-size: 16px;
}

.about-image {
    margin-top: 30px;
}

.about-image img {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.about-image figcaption {
    text-align: center;
    margin-top: 10px;
    font-size: 14px;
    color: var(--gray-color);
    font-style: italic;
}

/* 时间线样式 */
.timeline {
    margin-bottom: 80px;
}

.timeline-container {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline-container::after {
    content: '';
    position: absolute;
    width: 2px;
    background-color: var(--gray-color);
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -1px;
}

.timeline-item {
    padding: 10px 40px;
    position: relative;
    width: 50%;
    box-sizing: border-box;
}

.timeline-item:nth-child(odd) {
    left: 0;
}

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

.timeline-dot {
    width: 20px;
    height: 20px;
    position: absolute;
    background-color: var(--primary-color);
    border-radius: 50%;
    top: 15px;
    z-index: 1;
}

.timeline-item:nth-child(odd) .timeline-dot {
    right: -10px;
}

.timeline-item:nth-child(even) .timeline-dot {
    left: -10px;
}

.timeline-content {
    padding: 20px;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.timeline-content h4 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

/* 团队样式 */
.team-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(220px, 400px));
    gap: 60px;
    justify-content: center;
}

.team-list {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.team-member-row {
    border-bottom: 1px solid #eee;
    padding: 15px 0;
    display: flex;
    justify-content: center;
}

.team-member-row:last-child {
    border-bottom: none;
}

.member-info {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0 20px;
}

.member-info h4 {
    margin: 0;
    font-size: 20px;
    color: var(--dark-color);
    font-weight: 600;
    min-width: 80px;
}

.member-info span {
    display: inline-block;
    margin: 0;
    color: var(--gray-color);
    padding: 5px 0;
}

.position {
    color: #333 !important;
    font-weight: 600;
    min-width: 80px;
}

.callsign {
    font-weight: 500;
    min-width: 80px;
}

.team-member {
    background-color: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    text-align: center;
    transition: var(--transition);
}

.team-member:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.member-photo {
    width: 100%;
    height: 300px;
    overflow: hidden;
}

.member-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.team-member h4 {
    margin-top: 20px;
    font-size: 20px;
    color: var(--dark-color);
}

.team-member p {
    color: var(--gray-color);
    margin: 5px 0;
    padding-bottom: 20px;
}

.team-member p:first-of-type {
    color: var(--primary-color);
    font-weight: 500;
}

/* 联系我们页面样式 */
.contact-content {
    padding: 80px 0;
}

.contact-info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin-bottom: 50px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.info-card {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 30px 20px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

.info-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.info-card .info-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 20px;
    background-color: var(--primary-color-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.info-card .info-icon i {
    font-size: 28px;
    color: var(--primary-color);
}

.info-card h4 {
    font-size: 20px;
    margin-bottom: 10px;
    color: var(--dark-color);
}

.info-card p {
    color: var(--gray-color);
    font-size: 16px;
}

.contact-image {
    margin-top: 30px;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.contact-image img {
    width: 100%;
    height: auto;
    display: block;
}

.logo-large {
    max-width: 500px;
    width: 100%;
    height: auto;
    margin: 0 auto;
    display: block;
    transform: scale(5);
    transform-origin: center center;
    margin: 250px auto;
}

/* 响应式设计 */
@media (max-width: 900px) {
    .main-title {
        font-size: 40px;
    }
    
    .hero .highlight-text {
        font-size: 28px;
    }
    
    .hero-description {
        font-size: 18px;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline-container::after {
        left: 31px;
    }
    
    .timeline-item {
        width: 100%;
        padding-left: 70px;
        padding-right: 25px;
    }
    
    .timeline-item:nth-child(even) {
        left: 0;
    }
    
    .timeline-dot {
        left: 21px !important;
    }
    
    .contact-info-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-info {
        order: 2;
    }
    
    .contact-form {
        order: 1;
        margin-bottom: 50px;
    }
}

@media (max-width: 768px) {
    header .container {
        flex-direction: column;
    }
    
    .logo {
        margin-bottom: 15px;
    }
    
    nav ul {
        gap: 15px;
    }
    
    .hero {
        padding: 60px 0;
    }
    
    .hero .cta {
        flex-direction: column;
        align-items: center;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
    
    .hero.enhanced {
        padding: 80px 0 70px;
    }
}

@media (max-width: 480px) {
    nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .main-title {
        font-size: 32px;
    }
    
    .hero .highlight-text {
        font-size: 24px;
    }
    
    .hero-description {
        font-size: 16px;
        padding: 0 15px;
    }
    
    .feature-item {
        padding: 20px;
    }
    
    .info-icon {
        flex: 0 0 40px;
        height: 40px;
        font-size: 16px;
    }
    
    .qrcode-popup {
        width: 180px;
    }
    
    .qrcode-popup img {
        width: 120px;
        height: 120px;
    }
    
    .contact-info-grid {
        grid-template-columns: 1fr;
    }
}

.acknowledgments {
    max-width: 800px;
    margin: 20px auto;
    text-align: center;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 15px 10px;
}

.acknowledgments-note {
    text-align: center;
    color: var(--gray-color);
    font-size: 14px;
    margin: -10px 0 15px;
    font-style: italic;
}

.acknowledgments .callsign {
    display: block;
    color: var(--gray-color);
    font-size: 16px;
    padding: 5px 10px;
    border-radius: 4px;
    background-color: #f5f5f5;
}

.acknowledgments-more {
    text-align: center;
    font-style: italic;
    color: var(--gray-color);
    margin-top: 20px;
    font-size: 16px;
    padding: 10px 0;
    border-top: 1px dashed #e0e0e0;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}