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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: #333;
    background: #fafafa;
    line-height: 1.75;
    font-size: 16px;
}

a {
    color: #2b6cb0;
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: #1a4d80;
}

.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- 头部 ---------- */
.site-header {
    background: #fff;
    border-bottom: 1px solid #eee;
    padding: 20px 0;
    margin-bottom: 48px;
}

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

.site-title {
    font-size: 20px;
    font-weight: 600;
    color: #222;
    letter-spacing: 0.5px;
}

.site-title:hover {
    color: #2b6cb0;
}

.site-nav a {
    margin-left: 20px;
    color: #666;
    font-size: 15px;
}

.site-nav a:hover {
    color: #2b6cb0;
}

/* ---------- 首页 Hero ---------- */
.hero {
    text-align: center;
    margin-bottom: 56px;
}

.hero h1 {
    font-size: 32px;
    font-weight: 600;
    color: #222;
    margin-bottom: 12px;
}

.hero .subtitle {
    color: #888;
    font-size: 16px;
}

/* ---------- 文章列表 ---------- */
.post-list {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.post-item {
    padding-bottom: 32px;
    border-bottom: 1px solid #eee;
}

.post-item:last-child {
    border-bottom: none;
}

.post-title {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 8px;
}

.post-title a {
    color: #222;
}

.post-title a:hover {
    color: #2b6cb0;
}

.post-meta {
    color: #999;
    font-size: 14px;
    margin-bottom: 12px;
}

.post-summary {
    color: #555;
    margin-bottom: 12px;
}

.read-more {
    font-size: 14px;
    color: #2b6cb0;
}

.empty-tip {
    color: #999;
    text-align: center;
    padding: 40px 0;
}

/* ---------- 文章详情 ---------- */
.post-detail {
    background: #fff;
    padding: 40px 36px;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.post-header {
    margin-bottom: 32px;
    padding-bottom: 20px;
    border-bottom: 1px solid #eee;
}

.post-header h1 {
    font-size: 28px;
    font-weight: 600;
    color: #222;
    margin-bottom: 8px;
    line-height: 1.4;
}

.post-content h2 {
    font-size: 20px;
    margin: 32px 0 16px;
    color: #222;
}

.post-content h3 {
    font-size: 17px;
    margin: 24px 0 12px;
    color: #222;
}

.post-content p {
    margin-bottom: 16px;
}

.post-content ul,
.post-content ol {
    margin: 0 0 16px 24px;
}

.post-content li {
    margin-bottom: 6px;
}

.post-content blockquote {
    border-left: 3px solid #ddd;
    padding: 8px 16px;
    color: #666;
    background: #f9f9f9;
    margin: 16px 0;
    border-radius: 0 4px 4px 0;
}

.post-content code {
    background: #f4f4f4;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 14px;
    font-family: "SFMono-Regular", Consolas, Menlo, monospace;
}

.post-content pre {
    background: #2d2d2d;
    color: #f8f8f2;
    padding: 16px;
    border-radius: 6px;
    overflow-x: auto;
    margin: 16px 0;
}

.post-content pre code {
    background: transparent;
    padding: 0;
    color: inherit;
}

.post-footer {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid #eee;
}

.back-link {
    color: #666;
    font-size: 14px;
}

.back-link:hover {
    color: #2b6cb0;
}

/* ---------- 关于页面 ---------- */
.about {
    background: #fff;
    padding: 40px 36px;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.about h1 {
    font-size: 26px;
    margin-bottom: 20px;
    color: #222;
}

.about h2 {
    font-size: 18px;
    margin: 28px 0 12px;
    color: #222;
}

.about p {
    margin-bottom: 14px;
    color: #444;
}

.contact-list {
    list-style: none;
    padding: 0;
}

.contact-list li {
    margin-bottom: 8px;
    color: #555;
}

/* ---------- 404 ---------- */
.not-found {
    text-align: center;
    padding: 80px 0;
}

.not-found h1 {
    font-size: 72px;
    color: #ddd;
    margin-bottom: 16px;
}

.not-found p {
    color: #888;
    margin-bottom: 24px;
}

/* ---------- 底部 ---------- */
.site-footer {
    margin-top: 80px;
    padding: 32px 0;
    text-align: center;
    color: #aaa;
    font-size: 14px;
    border-top: 1px solid #eee;
}

/* ---------- 响应式 ---------- */
@media (max-width: 640px) {
    .hero h1 {
        font-size: 26px;
    }
    .post-detail,
    .about {
        padding: 28px 20px;
    }
    .post-header h1 {
        font-size: 22px;
    }
    .header-inner {
        flex-direction: column;
        gap: 12px;
    }
    .site-nav a {
        margin: 0 10px;
    }
}