:root {
    --c-bg: #f5f7fa;
    --c-card: #ffffff;
    --c-text: #2c3e50;
    --c-text-soft: #666666;
    --c-border: #f0f0f0;
    --c-primary: #667eea;
    --c-primary-hover: #764ba2;
    --radius: 6px;
    --maxw: 800px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.75;
    color: var(--c-text);
    background: var(--c-bg);
}
a { color: var(--c-primary); text-decoration: none; }
a:hover { color: var(--c-primary-hover); }
img { max-width: 100%; height: auto; border-radius: 6px; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ===== Header ===== */
.site-header {
    background: var(--c-card);
    border-bottom: 1px solid var(--c-border);
    position: sticky;
    top: 0;
    z-index: 50;
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}
.brand { color: var(--c-text); font-weight: 700; font-size: 18px; }
.site-nav { display: flex; gap: 16px; align-items: center; }
.site-nav a { color: var(--c-text-soft); font-size: 15px; }
.site-nav a:hover { color: var(--c-primary); }

main { padding: 24px 20px; }

/* ===== 文章列表 ===== */
.post-list { display: flex; flex-direction: column; gap: 16px; }
.post-card {
    background: var(--c-card);
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    padding: 22px 24px;
    transition: box-shadow .15s;
}
.post-card:hover { box-shadow: 0 4px 16px rgba(0,0,0,.08); }
.post-title { margin: 0 0 8px; font-size: 20px; line-height: 1.4; }
.post-title a { color: var(--c-text); }
.post-title a:hover { color: var(--c-primary); }
.post-meta { color: var(--c-text-soft); font-size: 13px; display: flex; gap: 12px; margin-bottom: 10px; align-items: center; flex-wrap: wrap; }
.post-excerpt { color: var(--c-text-soft); font-size: 14px; line-height: 1.7; }

/* 文章卡片上的专栏标签 */
.post-cat {
    display: inline-block;
    padding: 1px 8px;
    background: rgba(102, 126, 234, 0.1);
    color: var(--c-primary);
    border-radius: 4px;
    font-size: 12px;
    transition: background .2s;
}
.post-cat:hover {
    background: rgba(102, 126, 234, 0.2);
    color: var(--c-primary);
}

/* ===== 首页专栏导航 ===== */
.column-nav {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding: 4px 0 16px;
    margin-bottom: 8px;
    -webkit-overflow-scrolling: touch;
}
.column-nav::-webkit-scrollbar {
    display: none;
}
.column-nav-item {
    display: inline-block;
    padding: 7px 16px;
    border-radius: 50px;
    background: var(--c-card);
    border: 1px solid var(--c-border);
    color: var(--c-text-soft);
    font-size: 14px;
    white-space: nowrap;
    flex-shrink: 0;
    transition: all .2s;
}
.column-nav-item:hover {
    border-color: var(--c-primary);
    color: var(--c-primary);
}
.column-nav-item.active {
    background: var(--c-primary);
    color: #fff;
    border-color: var(--c-primary);
}

/* ===== 专栏头部 ===== */
.column-header {
    background: var(--c-card);
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    padding: 28px 32px;
    margin-bottom: 24px;
}
.column-name {
    margin: 0 0 8px;
    font-size: 26px;
    line-height: 1.3;
}
.column-desc {
    margin: 0 0 16px;
    color: var(--c-text-soft);
    font-size: 15px;
    line-height: 1.7;
}
.column-stats {
    font-size: 13px;
    color: var(--c-text-soft);
}

/* ===== 专栏作者列表 ===== */
.column-authors {
    padding: 16px 0;
    border-top: 1px solid var(--c-border);
    border-bottom: 1px solid var(--c-border);
    margin-bottom: 12px;
}
.column-authors-label {
    font-size: 13px;
    color: var(--c-text-soft);
    margin-bottom: 12px;
}
.column-authors-list {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}
.column-author-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--c-text);
    text-decoration: none;
    transition: opacity .2s;
}
.column-author-item:hover {
    opacity: .75;
    color: var(--c-text);
}
.column-author-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}
.column-author-name {
    font-size: 14px;
}

/* ===== 文章详情 ===== */
.post-single {
    background: var(--c-card);
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    padding: 32px 36px;
}
.post-single-head { margin-bottom: 20px; padding-bottom: 16px; border-bottom: 1px dashed var(--c-border); }
.post-single-head .post-title { font-size: 26px; margin: 0 0 10px; }
.post-content { font-size: 16.5px; line-height: 1.8; }
.post-content h2 { border-left: 4px solid var(--c-primary); padding-left: 10px; margin: 1.6em 0 .6em; }
.post-content h3 { margin: 1.4em 0 .6em; }
.post-content p { margin: 1em 0; }
.post-content ul, .post-content ol { padding-left: 1.5em; }
.post-content blockquote {
    margin: 1rem 0;
    padding: 8px 16px;
    border-left: 4px solid var(--c-primary);
    background: rgba(102,126,234,0.08);
    border-radius: 0 6px 6px 0;
    color: var(--c-text-soft);
}
.post-content code {
    background: #f3f4f6;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: Menlo, Consolas, monospace;
    font-size: .92em;
}
.post-content pre {
    background: #f3f4f6;
    padding: 14px 16px;
    border-radius: 8px;
    overflow-x: auto;
}

/* ===== 文章作者信息 ===== */
.post-author {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 0;
    border-top: 1px solid var(--c-border);
    border-bottom: 1px solid var(--c-border);
    margin-bottom: 24px;
}
.post-author-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    flex-shrink: 0;
    object-fit: cover;
}
.post-author-info {
    flex: 1;
    min-width: 0;
}
.post-author-name {
    font-weight: 600;
    font-size: 15px;
    color: var(--c-text);
}
.post-author-bio {
    font-size: 13px;
    color: var(--c-text-soft);
    margin-top: 2px;
}

/* ===== 归档 ===== */
.archive-title { font-size: 22px; margin: 0 0 20px; }

/* ===== 分页 ===== */
.pagenav { margin: 24px 0; text-align: center; }
.pagenav .page-navigator {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
    gap: 8px;
}
.pagenav .page-navigator li a,
.pagenav .page-navigator li span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 10px;
    border: 1px solid var(--c-border);
    border-radius: 50px;
    color: var(--c-text);
    background: transparent;
}
.pagenav .page-navigator li.current a {
    background: var(--c-primary);
    color: #fff;
    border-color: var(--c-primary);
}

/* ===== 评论区 ===== */
.comments {
    margin-top: 24px;
    background: var(--c-card);
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    padding: 24px 28px;
}
.comments-title { margin: 0 0 16px; font-size: 17px; }
.comment-list { list-style: none; padding: 0; margin: 24px 0 0; }
.comment-body { margin-bottom: 16px; padding-bottom: 16px; border-bottom: 1px solid var(--c-border); }
.comment-body:last-child { border-bottom: none; }

/* 评论列表 */
.comment-inner {
    display: flex;
    gap: 10px;
}
.comment-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    flex-shrink: 0;
    object-fit: cover;
}
.comment-main {
    flex: 1;
    min-width: 0;
}
.comment-author {
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 4px;
}
.comment-content {
    font-size: 14px;
    margin-bottom: 6px;
    line-height: 1.6;
}
.comment-meta {
    font-size: 12px;
    color: #999;
    display: flex;
    align-items: center;
    gap: 12px;
}
.comment-children {
    list-style: none;
    padding: 0;
    margin: 12px 0 0 50px;
}

/* 评论表单 */
.comment-form textarea {
    width: 100%;
    min-height: 80px;
    padding: 10px 12px;
    border: 1px solid var(--c-border);
    border-radius: 6px;
    font-family: inherit;
    font-size: 14px;
    background: var(--c-bg);
    color: var(--c-text);
    resize: vertical;
}
.btn {
    display: inline-block;
    padding: 9px 18px;
    background: var(--c-primary);
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    margin-top: 10px;
}
.btn:hover { opacity: .92; }
.login-tip { color: var(--c-text-soft); font-size: 14px; }
.login-tip a { color: var(--c-primary); }
.closed { color: var(--c-text-soft); }

/* ===== 评论提示 ===== */
.muted-tip {
    padding: 12px 16px;
    background: #fef3c7;
    color: #92400e;
    border-radius: 6px;
    font-size: 14px;
    margin: 0;
}
.submit-tip {
    padding: 10px 14px;
    background: #f0fdf4;
    color: #16a34a;
    border-radius: 6px;
    font-size: 14px;
    margin-bottom: 12px;
}

/* ===== 点赞按钮 ===== */
.post-actions {
    margin-top: 24px;
    padding-top: 18px;
    border-top: 1px dashed var(--c-border);
}
.like-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: var(--c-bg);
    border: 1px solid var(--c-border);
    border-radius: 50px;
    cursor: pointer;
    font-size: 14px;
    color: var(--c-text-soft);
    font-family: inherit;
    transition: all .2s;
}
.like-btn:hover {
    border-color: var(--c-primary);
    color: var(--c-primary);
}
.like-btn.liked {
    background: rgba(244, 67, 54, 0.1);
    border-color: #f44336;
    color: #f44336;
}
.like-icon {
    font-size: 16px;
    line-height: 1;
}

/* 评论里的点赞按钮（小尺寸） */
.like-btn-sm {
    padding: 2px 8px !important;
    font-size: 12px !important;
    gap: 4px !important;
    margin-top: 0 !important;
}
.like-btn-sm .like-icon {
    font-size: 12px !important;
}

/* ===== 空状态 ===== */
.empty {
    background: var(--c-card);
    border: 1px dashed var(--c-border);
    border-radius: var(--radius);
    padding: 60px 20px;
    text-align: center;
    color: var(--c-text-soft);
}

/* ===== 页脚 ===== */
.site-footer {
    margin-top: 40px;
    padding: 24px 0;
    border-top: 1px solid var(--c-border);
    color: var(--c-text-soft);
    font-size: 13px;
    text-align: center;
}

/* ===== 移动端 ===== */
@media (max-width: 640px) {
    .container { padding: 0 12px; }
    main { padding: 16px 12px; }
    .post-card { padding: 18px 16px; }
    .post-single { padding: 20px 16px; }
    .post-single-head .post-title { font-size: 20px; }
    .comments { padding: 18px 16px; }
    .header-inner { height: 54px; }
    .site-nav { gap: 10px; }
    .site-nav a { font-size: 14px; }
    .comment-children { margin-left: 20px; }
    .column-header { padding: 20px 16px; }
    .column-name { font-size: 20px; }
}