/* ===== GX挑战者协会官网样式表 - 清爽科技风格 ===== */
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;500;600;700;800;900&family=Rajdhani:wght@300;400;500;600;700&display=swap');

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

html {
    scroll-behavior: smooth;
}

:root {
    --primary-color: #3b82f6;
    --secondary-color: #8b5cf6;
    --accent-color: #f59e0b;
    --dark-color: #0f172a;
    --darker-color: #020617;
    --light-color: #1e293b;
    --text-color: #f1f5f9;
    --text-muted: #94a3b8;
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Rajdhani', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    background: var(--dark-color);
}

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

h1, h2, h3, h4, h5, h6 {
    font-family: 'Orbitron', sans-serif;
}

/* ===== 导航栏 ===== */
.navbar {
    background: rgba(15, 23, 42, 0.95);
    padding: 1rem 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(59, 130, 246, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    font-size: 1.4rem;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.logo-text {
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

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

.nav-menu a {
    font-family: 'Orbitron', sans-serif;
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: var(--transition);
    padding: 0.5rem 1rem;
    border-radius: 6px;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary-color);
    background: rgba(0, 212, 255, 0.1);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 6px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 3px;
}

/* ===== 英雄区 ===== */
.hero {
    background: var(--dark-color);
    color: white;
    padding: 160px 20px 100px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content h1 {
    font-size: 3.2rem;
    margin-bottom: 1.5rem;
    line-height: 1.1;
    color: var(--primary-color);
}

.hero-content > p {
    font-size: 1.3rem;
    margin-bottom: 2.5rem;
    opacity: 0.9;
    color: var(--text-muted);
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.btn {
    font-family: 'Orbitron', sans-serif;
    padding: 12px 32px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--darker-color);
}

.btn-primary:hover {
    transform: translateY(-2px);
    background: #2563eb;
}

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

.btn-secondary:hover {
    background: rgba(59, 130, 246, 0.1);
    transform: translateY(-2px);
}

.hero-shape {
    position: relative;
    height: 400px;
}

.shape {
    position: absolute;
    border-radius: 50%;
    opacity: 0.3;
}

.shape-1 {
    width: 250px;
    height: 250px;
    background: var(--primary-color);
    top: 0;
    right: 0;
}

.shape-2 {
    width: 180px;
    height: 180px;
    background: var(--secondary-color);
    bottom: 0;
    left: 0;
}

/* ===== 特色介绍 ===== */
.features {
    padding: 100px 20px;
    background: var(--darker-color);
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 4rem;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 3px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--light-color);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    text-align: center;
    transition: var(--transition);
    border: 1px solid rgba(59, 130, 246, 0.1);
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary-color);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    display: inline-block;
    color: var(--primary-color);
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.feature-card p {
    color: var(--text-muted);
    line-height: 1.8;
}

/* ===== 快速统计 ===== */
.stats {
    background: var(--dark-color);
    padding: 80px 20px;
}

.stats .container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
}

.stat-item {
    text-align: center;
    padding: 2rem;
}

.stat-item h3 {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
    font-family: 'Orbitron', sans-serif;
}

.stat-item p {
    font-size: 1.1rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 2px;
}

/* ===== 新闻预览 ===== */
.news-preview {
    padding: 100px 20px;
    background: var(--darker-color);
}

.news-preview h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 4rem;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 3px;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.news-card {
    background: var(--light-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid rgba(59, 130, 246, 0.1);
}

.news-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary-color);
}

.news-date {
    background: var(--primary-color);
    color: var(--darker-color);
    padding: 0.8rem 1.2rem;
    font-size: 0.85rem;
    font-weight: 700;
    font-family: 'Orbitron', sans-serif;
}

.news-card h3 {
    padding: 1.5rem 1.5rem 0.8rem;
    color: var(--primary-color);
    font-size: 1.2rem;
}

.news-card p {
    padding: 0 1.5rem;
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1.7;
}

.read-more {
    display: inline-block;
    padding: 1.5rem;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    font-family: 'Orbitron', sans-serif;
    text-transform: uppercase;
    font-size: 0.85rem;
    transition: var(--transition);
}

.read-more:hover {
    color: var(--accent-color);
}

/* ===== 页面标题 ===== */
.page-header {
    background: var(--dark-color);
    color: white;
    padding: 140px 20px 80px;
    text-align: center;
    border-bottom: 1px solid rgba(59, 130, 246, 0.1);
}

.page-header h1 {
    font-size: 2.8rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 4px;
}

.page-header p {
    font-size: 1.2rem;
    color: var(--text-muted);
}

/* ===== 关于我们 ===== */
.about-section {
    padding: 100px 20px;
    background: var(--darker-color);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.about-text p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    line-height: 1.9;
    font-size: 1.05rem;
}

.about-image {
    display: flex;
    justify-content: center;
}

.image-placeholder {
    width: 100%;
    aspect-ratio: 1;
    background: var(--light-color);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: 2.5rem;
    font-weight: bold;
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.image-placeholder-large {
    width: 100%;
    height: 250px;
    background: var(--light-color);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 2rem;
    border: 1px solid rgba(59, 130, 246, 0.2);
}

/* ===== 使命与价值观 ===== */
.mission {
    padding: 100px 20px;
    background: var(--dark-color);
}

.mission h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 4rem;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 3px;
}

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

.mission-card {
    background: var(--light-color);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
    border-left: 4px solid var(--primary-color);
}

.mission-card:hover {
    transform: translateX(8px);
}

.mission-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-family: 'Orbitron', sans-serif;
}

.mission-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.mission-card p {
    color: var(--text-muted);
    line-height: 1.8;
}

/* ===== 时间线 ===== */
.timeline {
    padding: 100px 20px;
    background: var(--darker-color);
}

.timeline h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 4rem;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 3px;
}

.timeline-items {
    position: relative;
    padding: 2rem 0;
}

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

.timeline-item {
    margin-bottom: 3rem;
    position: relative;
    width: 50%;
}

.timeline-item:nth-child(odd) {
    margin-left: 0;
    padding-right: 4rem;
    text-align: right;
}

.timeline-item:nth-child(even) {
    margin-left: 50%;
    padding-left: 4rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border: 4px solid var(--darker-color);
    border-radius: 50%;
    top: 4px;
}

.timeline-item:nth-child(odd)::before {
    right: -32px;
}

.timeline-item:nth-child(even)::before {
    left: -32px;
}

.timeline-date {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 1.1rem;
    font-family: 'Orbitron', sans-serif;
    margin-bottom: 0.5rem;
}

.timeline-content {
    background: var(--light-color);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border: 1px solid rgba(0, 212, 255, 0.1);
}

.timeline-content h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.timeline-content p {
    color: var(--text-muted);
}

/* ===== 组织结构 ===== */
.organization {
    padding: 100px 20px;
    background: var(--dark-color);
}

.organization h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 4rem;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 3px;
}

.org-chart {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3rem;
}

.org-president {
    width: 220px !important;
    margin-bottom: 1.5rem;
}

.org-boxes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 2rem;
    width: 100%;
    max-width: 1000px;
}

.org-box {
    background: var(--light-color);
    border: 2px solid var(--primary-color);
    border-radius: var(--border-radius);
    padding: 2rem 1.5rem;
    text-align: center;
    width: 160px;
    margin: 0 auto;
    transition: var(--transition);
}

.org-box:hover {
    transform: scale(1.05);
    background: rgba(59, 130, 246, 0.05);
}

.org-title {
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1rem;
    font-family: 'Orbitron', sans-serif;
}

.org-name {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ===== 成员卡片 ===== */
.members-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.member-card {
    background: var(--light-color);
    border-radius: var(--border-radius);
    padding: 2.5rem;
    text-align: center;
    transition: var(--transition);
    border: 1px solid rgba(59, 130, 246, 0.1);
}

.member-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary-color);
}

.member-avatar {
    width: 100px;
    height: 100px;
    margin: 0 auto 1.5rem;
    border-radius: 50%;
    background: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
}

.avatar-placeholder {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--darker-color);
    font-weight: bold;
    font-size: 1.3rem;
    font-family: 'Orbitron', sans-serif;
}

.member-card h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

.position {
    color: var(--secondary-color);
    font-weight: 600;
    margin-bottom: 1rem;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.bio {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.member-tags {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.member-tags span {
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary-color);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

/* ===== 成员展示 ===== */
.members-showcase {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.showcase-card {
    background: var(--light-color);
    border-radius: var(--border-radius);
    padding: 2.5rem;
    transition: var(--transition);
    border-top: 4px solid var(--secondary-color);
}

.showcase-card:hover {
    transform: translateY(-8px);
}

.showcase-avatar {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    border-radius: 50%;
    background: var(--secondary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 1.2rem;
    font-family: 'Orbitron', sans-serif;
}

.showcase-card h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.role {
    color: var(--secondary-color);
    font-weight: 600;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.achievements {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.badge {
    background: rgba(99, 102, 241, 0.1);
    color: var(--secondary-color);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

/* ===== 招聘信息 ===== */
.recruitment {
    padding: 100px 20px;
    background: var(--dark-color);
}

.recruitment h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 3px;
}

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

.recruitment-content > p {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 3rem;
    line-height: 1.8;
}

.department-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.dept-item {
    background: var(--light-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    border: 1px solid rgba(59, 130, 246, 0.1);
    transition: var(--transition);
}

.dept-item:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

.dept-item h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.dept-item p {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ===== 新闻列表 ===== */
.news-list {
    padding: 100px 20px;
    background: var(--darker-color);
}

.news-items {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.full-news-card {
    background: var(--light-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    border: 1px solid rgba(59, 130, 246, 0.1);
}

.news-header {
    padding: 2rem;
    background: var(--primary-color);
    color: var(--darker-color);
}

.news-header h2 {
    font-size: 1.6rem;
    margin-bottom: 1rem;
}

.news-meta {
    display: flex;
    gap: 1.5rem;
    font-size: 0.9rem;
}

.date {
    font-weight: 700;
    font-family: 'Orbitron', sans-serif;
}

.category {
    background: rgba(15, 23, 42, 0.2);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-weight: 600;
    text-transform: uppercase;
}

.news-content {
    padding: 2rem;
    color: var(--text-muted);
    line-height: 1.9;
}

.news-content p {
    margin-bottom: 1.2rem;
    font-size: 1rem;
}

.news-content strong {
    color: var(--primary-color);
}

/* ===== 联系方式 ===== */
.contact-info {
    padding: 100px 20px;
    background: var(--dark-color);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.info-card {
    background: var(--light-color);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    text-align: center;
    transition: var(--transition);
    border: 1px solid rgba(0, 212, 255, 0.1);
}

.info-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary-color);
}

.info-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    display: inline-block;
    color: var(--primary-color);
}

.info-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.info-card p {
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.info-card a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.info-card a:hover {
    color: var(--accent-color);
}

.desc {
    font-size: 0.9rem !important;
    opacity: 0.7;
}

/* ===== 联系表单 ===== */
.contact-form-section {
    padding: 100px 20px;
    background: var(--darker-color);
}

.contact-form-section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 3px;
}

.form-container {
    max-width: 600px;
    margin: 0 auto;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 1rem;
    background: var(--light-color);
    border: 2px solid rgba(59, 130, 246, 0.2);
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-color);
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 150px;
}

.success-message {
    background: rgba(16, 185, 129, 0.1);
    border: 2px solid var(--accent-color);
    color: var(--accent-color);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    text-align: center;
    font-weight: 600;
}

/* ===== 社交媒体 ===== */
.social-media {
    padding: 80px 20px;
    text-align: center;
    background: var(--dark-color);
}

.social-media h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.social-media > p {
    color: var(--text-muted);
    margin-bottom: 2.5rem;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.social-icon {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    width: 90px;
    padding: 1.2rem;
    background: var(--light-color);
    border-radius: var(--border-radius);
    text-decoration: none;
    color: var(--text-muted);
    transition: var(--transition);
    border: 1px solid rgba(59, 130, 246, 0.1);
}

.social-icon:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.social-icon span:first-child {
    font-size: 2rem;
}

.social-icon span:last-child {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
}

/* ===== FAQ ===== */
.faq {
    padding: 100px 20px;
    background: var(--darker-color);
}

.faq h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 4rem;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 3px;
}

.faq-items {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.faq-item {
    background: var(--light-color);
    border: 2px solid rgba(59, 130, 246, 0.1);
    border-radius: var(--border-radius);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: var(--primary-color);
}

.faq-question {
    padding: 1.5rem;
    font-weight: 600;
    color: var(--text-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.faq-item:hover .faq-question {
    color: var(--primary-color);
}

.faq-answer {
    padding: 1.5rem;
    color: var(--text-muted);
    line-height: 1.8;
    display: none;
}

.faq-item.active .faq-answer {
    display: block;
}

/* ===== 页脚 ===== */
.footer {
    background: var(--darker-color);
    color: var(--text-muted);
    padding: 80px 20px 30px;
    border-top: 1px solid rgba(59, 130, 246, 0.1);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section h4 {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.footer-section p {
    font-size: 0.95rem;
    line-height: 1.7;
}

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

.footer-section ul li {
    margin-bottom: 0.6rem;
}

.footer-section a {
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition);
    font-size: 0.95rem;
}

.footer-section a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    border-top: 1px solid rgba(0, 212, 255, 0.1);
    padding-top: 2rem;
    font-size: 0.9rem;
    opacity: 0.7;
}

/* ===== 响应式设计 ===== */
@media (max-width: 992px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        padding: 120px 20px 60px;
    }

    .hero-content h1 {
        font-size: 2.2rem;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-shape {
        display: none;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .timeline-items::before {
        left: 0;
    }

    .timeline-item {
        width: 100%;
        padding-left: 2.5rem !important;
        padding-right: 0 !important;
        text-align: left !important;
    }

    .timeline-item::before {
        left: -26px !important;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        gap: 1rem;
        font-size: 0.8rem;
    }

    .hamburger {
        display: flex;
    }

    .hero-content h1 {
        font-size: 1.8rem;
    }

    .hero-content > p {
        font-size: 1rem;
    }

    .features h2,
    .news-preview h2,
    .mission h2,
    .organization h2,
    .recruitment h2,
    .news-list h2,
    .contact-form-section h2,
    .faq h2,
    .social-media h2 {
        font-size: 1.6rem;
        letter-spacing: 2px;
    }

    .stats .container {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .stat-item h3 {
        font-size: 2.2rem;
    }

    .page-header h1 {
        font-size: 1.8rem;
        letter-spacing: 2px;
    }

    .org-boxes {
        grid-template-columns: 1fr;
    }

    .org-box {
        width: 100%;
    }

    .features-grid,
    .mission-grid,
    .members-grid,
    .info-grid {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 480px) {
    .nav-menu {
        display: none;
    }

    .logo {
        font-size: 1.1rem;
    }

    .hero-content h1 {
        font-size: 1.5rem;
    }

    .hero-content > p {
        font-size: 0.95rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .stats .container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .stat-item h3 {
        font-size: 1.8rem;
    }

    .news-header h2 {
        font-size: 1.3rem;
    }

    .page-header h1 {
        font-size: 1.4rem;
        letter-spacing: 1px;
    }
}