@charset "utf-8";
/* ========== 全局重置 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}
body {
    margin-right: auto;
    margin-left: auto;
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background-color: #f4f5f7;
    color: #1e293b;
    line-height: 1.6;
}

/* ========== 页面主容器 ========== */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 100px 24px 40px;   /* 顶部留白用于无导航时的间距，若有导航可改为 40px */
}

/* ========== 文章卡片 ========== */
.article-card {
    background: #fff;
    border: 1px solid #e0e4e8;
    border-radius: 20px;
    padding: 50px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.04);
}

/* ========== 文章头部 ========== */
.article-header {
    margin-bottom: 40px;
    border-bottom: 1px solid #e0e4e8;
    padding-bottom: 30px;
}
.article-tag {
    display: inline-block;
    background: #e6f0fa;
    color: #0066cc;
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 16px;
}
.article-header h1 {
    font-size: 2rem;
    color: #0f172a;
    margin-bottom: 12px;
    line-height: 1.4;
    letter-spacing: 0.03em;
}
.article-meta {
    color: #64748b;
    font-size: 0.9rem;
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

/* ========== 文章正文排版 ========== */
.article-body {
    color: #1e293b;
    font-size: 1rem;
    line-height: 2;
    letter-spacing: 0.015em;
}
.article-body h2 {
    font-size: 1.4rem;
    color: #0f172a;
    margin: 40px 0 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid #0066cc;
    display: inline-block;
}
.article-body h3 {
    font-size: 1.15rem;
    color: #1e293b;
    margin: 28px 0 10px;
}
.article-body p {
    margin-bottom: 18px;
    color: #334155;
}
.article-body strong {
    color: #0f172a;
}
.article-body .highlight {
    background: #e6f0fa;
    padding: 2px 8px;
    border-radius: 4px;
    color: #0066cc;
    font-weight: 500;
}

/* ========== 文章内图片 ========== */
.article-img {
    width: 100%;
    margin: 30px 0;
    border-radius: 14px;
    overflow: hidden;
    background: #f0f0f0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
.article-img img {
    width: 100%;
    display: block;
    object-fit: cover;
}
.article-img .img-caption {
    padding: 10px 18px;
    color: #64748b;
    font-size: 0.85rem;
    background: #fafafa;
    text-align: center;
    border-top: 1px solid #e0e4e8;
}

/* 双图并排布局 */
.img-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin: 30px 0;
}
.img-row .article-img {
    margin: 0;
}

/* ========== 信息卡片（引用块） ========== */
.info-card {
    background: #f8faf9;
    border-left: 4px solid #0066cc;
    border-radius: 8px;
    padding: 20px 24px;
    margin: 24px 0;
}
.info-card p {
    margin-bottom: 0;
    font-weight: 500;
}

/* ========== 返回按钮 ========== */
.btn-back {
    display: inline-block;
    color: #0066cc;
    text-decoration: none;
    font-weight: 500;
    padding: 10px 24px;
    border: 1px solid #0066cc;
    border-radius: 30px;
    transition: all 0.3s;
    margin-top: 30px;
}
.btn-back:hover {
    background: #0066cc;
    color: #fff;
}

/* ========== 页脚 ========== */
footer {
    text-align: center;
    padding: 28px 0;
    border-top: 1px solid #e0e4e8;
    color: #94a3b8;
    font-size: 0.9rem;
    margin-top: 40px;
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .article-card {
        padding: 24px;
    }
    .img-row {
        grid-template-columns: 1fr;
    }
}