/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f5f5f5;
}

a {
    color: #2563eb;
    text-decoration: none;
}

a:hover {
    color: #1d4ed8;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部导航 */
header {
    background: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo a {
    font-size: 1.5rem;
    font-weight: bold;
    color: #1e293b;
}

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

.nav-links a {
    color: #64748b;
    font-weight: 500;
}

.nav-links a:hover,
.nav-links a.active {
    color: #2563eb;
}

/* Hero 区域 */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* 文章列表 */
.articles {
    padding: 3rem 20px;
}

.articles h2 {
    margin-bottom: 2rem;
    color: #1e293b;
}

.article-list {
    display: grid;
    gap: 2rem;
}

.article-card {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.article-card h3 {
    color: #1e293b;
    margin-bottom: 0.5rem;
}

.article-card .meta {
    color: #64748b;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.article-card p {
    color: #475569;
    margin-bottom: 1rem;
}

.article-card.placeholder {
    background: #f1f5f9;
    border: 2px dashed #cbd5e1;
}

.read-more {
    display: inline-block;
    color: #2563eb;
    font-weight: 500;
}

/* 关于预览 */
.about-preview {
    background: white;
    padding: 3rem 20px;
    text-align: center;
    margin: 2rem auto;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.about-preview h2 {
    margin-bottom: 1rem;
    color: #1e293b;
}

.about-preview p {
    color: #64748b;
    margin-bottom: 1rem;
}

.btn {
    display: inline-block;
    background: #2563eb;
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    margin-top: 1rem;
}

.btn:hover {
    background: #1d4ed8;
    color: white;
}

/* 页脚 */
footer {
    background: #1e293b;
    color: #94a3b8;
    padding: 2rem 0;
    text-align: center;
    margin-top: 3rem;
}

footer p {
    margin-bottom: 0.5rem;
}

.beian a {
    color: #64748b;
}

.beian a:hover {
    color: #94a3b8;
}

/* 响应式 */
@media (max-width: 768px) {
    .nav-links {
        gap: 1rem;
    }

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

/* 公众号区域 */
.wechat {
    background: white;
    padding: 3rem 20px;
    margin: 2rem auto;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.wechat h2 {
    text-align: center;
    color: #1e293b;
    margin-bottom: 2rem;
}

.wechat-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 3rem;
    max-width: 700px;
    margin: 0 auto;
    padding: 2rem;
    background: linear-gradient(135deg, #07c160 0%, #06ad56 100%);
    border-radius: 12px;
    color: white;
}

.wechat-info {
    flex: 1;
}

.wechat-info h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.wechat-info .desc {
    opacity: 0.95;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.wechat-info .wxid {
    opacity: 0.9;
    font-size: 0.95rem;
}

.wechat-info .wxid strong {
    font-size: 1.1rem;
}

.qr-placeholder {
    width: 200px;
    height: 200px;
    background: white;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #07c160;
    text-align: center;
    padding: 1rem;
}

.qr-placeholder .tip {
    font-size: 0.8rem;
    opacity: 0.7;
    margin-top: 0.5rem;
}

@media (max-width: 768px) {
    .wechat-card {
        flex-direction: column;
        text-align: center;
    }
}

/* 二维码图片样式 */
.qr-code {
    width: 200px;
    text-align: center;
}

.qr-code img {
    width: 200px;
    height: 200px;
    object-fit: contain;
    background: white;
    border-radius: 8px;
    padding: 5px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.qr-code .tip {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.9);
    margin-top: 0.75rem;
}