/* 探源行动子站通用样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #8B4513;
    --secondary-color: #D2691E;
    --accent-color: #CD853F;
    --text-color: #333;
    --text-light: #666;
    --bg-light: #f9f7f4;
    --bg-white: #fff;
    --border-color: #e0d6c8;
    --shadow: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-hover: 0 4px 16px rgba(0,0,0,0.12);
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: var(--bg-white);
}

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

/* 导航栏 */
.navbar {
    background: var(--bg-white);
    box-shadow: var(--shadow);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.nav-brand a {
    display: flex;
    flex-direction: column;
    text-decoration: none;
}

.brand-cn {
    font-size: 1.1rem;
    font-weight: bold;
    color: var(--primary-color);
}

.brand-en {
    font-size: 0.7rem;
    color: var(--text-light);
    margin-top: 2px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 1.5rem;
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-color);
    font-size: 0.9rem;
    transition: var(--transition);
}

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

.back-link a {
    padding: 4px 12px;
    background: var(--bg-light);
    border-radius: 4px;
    font-size: 0.85rem;
}

.back-link a:hover {
    background: var(--primary-color);
    color: white;
}

/* 首屏横幅 */
.hero {
    position: relative;
    height: 80vh;
    min-height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #8B4513 0%, #D2691E 100%);
    margin-top: 70px;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.2);
}

.hero-content {
    position: relative;
    text-align: center;
    color: white;
    padding: 0 20px;
    z-index: 1;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.hero-subtitle {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.95;
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    gap: 2.5rem;
    justify-content: center;
    margin-bottom: 2rem;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.2rem;
    font-weight: bold;
}

.stat-label {
    font-size: 0.85rem;
    opacity: 0.9;
}

/* 通用区块 */
.section {
    padding: 4rem 0;
}

.section:nth-child(even) {
    background: var(--bg-light);
}

.section-title {
    text-align: center;
    font-size: 1.8rem;
    margin-bottom: 2.5rem;
    color: var(--primary-color);
    position: relative;
    padding-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: var(--secondary-color);
}

/* 行动简介 */
.intro-lead {
    text-align: center;
    font-size: 1.05rem;
    color: var(--text-light);
    max-width: 800px;
    margin: 0 auto 2.5rem;
    line-height: 1.8;
}

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

.category-card {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: center;
}

.category-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-4px);
}

.category-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.category-card h3 {
    color: var(--primary-color);
    margin-bottom: 0.8rem;
    font-size: 1.3rem;
}

.category-card p {
    color: var(--text-light);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.category-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
    list-style: none;
}

.category-tags li {
    padding: 4px 12px;
    background: var(--bg-light);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-light);
}

/* 时间线 */
.timeline-content {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    padding-left: 2rem;
}

.timeline-content::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-color);
}

.timeline-item {
    position: relative;
    padding-bottom: 2rem;
    padding-left: 2rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -7px;
    top: 0;
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border-radius: 50%;
    border: 3px solid var(--bg-white);
    box-shadow: 0 0 0 2px var(--primary-color);
}

.timeline-date {
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.timeline-body h3 {
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.timeline-body p {
    color: var(--text-light);
    line-height: 1.6;
}

/* 按钮 */
.btn {
    display: inline-block;
    padding: 12px 32px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

/* 页脚 */
.footer {
    background: #2c2416;
    color: white;
    padding: 2.5rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-brand h3 {
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.footer-brand p {
    opacity: 0.8;
    margin-bottom: 0.3rem;
}

.footer-sub {
    font-size: 0.85rem;
    opacity: 0.6;
    margin-top: 0.5rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.footer-column h4 {
    color: var(--accent-color);
    margin-bottom: 1rem;
}

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

.footer-column li {
    margin-bottom: 0.5rem;
    opacity: 0.8;
}

.footer-column a {
    color: white;
    text-decoration: none;
    transition: var(--transition);
}

.footer-column a:hover {
    color: var(--accent-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    opacity: 0.7;
    font-size: 0.85rem;
}

/* 响应式 */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 1.8rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-stats {
        gap: 1.5rem;
    }
    
    .stat-number {
        font-size: 1.8rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
}