/* ===== 主题变量 ===== */
:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --text: #1f2328;
  --muted: #6b7280;
  --accent: #1d4ed8;
  --accent-soft: #dbeafe;
  --border: #e5e7eb;
  --code-bg: #f3f4f6;
  --on-accent: #ffffff;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
  --bg-grad:
    radial-gradient(1100px 520px at 88% -8%, rgba(59, 130, 246, 0.12), transparent 60%),
    radial-gradient(900px 480px at -8% 24%, rgba(20, 184, 166, 0.08), transparent 55%),
    linear-gradient(180deg, #f2f6fc 0%, #eaf0f8 100%);
  --header-bg: rgba(255, 255, 255, 0.72);
  --card-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --surface: #171a21;
    --text: #e6e8eb;
    --muted: #9aa0a6;
    --accent: #60a5fa;
    --accent-soft: #17284a;
    --border: #262a30;
    --code-bg: #1d2129;
  --on-accent: #0b1a33;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
    --bg-grad:
      radial-gradient(1100px 520px at 88% -8%, rgba(37, 99, 235, 0.16), transparent 60%),
      radial-gradient(900px 480px at -8% 24%, rgba(20, 184, 166, 0.08), transparent 55%),
      linear-gradient(180deg, #0a1428 0%, #060b16 100%);
    --header-bg: rgba(8, 15, 30, 0.72);
    --card-shadow: 0 2px 12px rgba(0, 0, 0, 0.35);
  }
}

/* ===== 基础 ===== */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg-grad);
  background-image: var(--bg-img, none),
    linear-gradient(var(--bg-img-veil, rgba(0, 0, 0, 0)), var(--bg-img-veil, rgba(0, 0, 0, 0))),
    var(--bg-grad);
  background-size: cover, auto, auto;
  background-position: center, 0 0, 0 0;
  background-repeat: no-repeat, repeat, repeat;
  background-attachment: fixed;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  line-height: 1.75;
  font-size: 16px;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }
.wrap { max-width: 780px; margin: 0 auto; padding: 0 20px; }

/* ===== 顶栏 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--header-bg);
  backdrop-filter: blur(14px) saturate(1.5);
  -webkit-backdrop-filter: blur(14px) saturate(1.5);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 12px rgba(0, 0, 0, 0.04);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  height: 60px;
  flex-wrap: wrap;
}
.site-title {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
}
.site-title:hover { text-decoration: none; }
.site-logo { width: 26px; height: 26px; }
.site-nav { display: flex; gap: 4px; flex-wrap: wrap; }
.site-nav a {
  color: var(--muted);
  padding: 5px 10px;
  border-radius: 8px;
  font-size: 14.5px;
}
.site-nav a:hover { color: var(--text); text-decoration: none; background: var(--surface); }
.site-nav a.active { color: var(--accent); background: var(--accent-soft); font-weight: 500; }

/* ===== 主体 ===== */
.main { padding: 40px 20px 60px; }
.hero { margin-bottom: 36px; }
.hero h1 { font-size: 30px; margin: 0 0 6px; letter-spacing: 0.5px; }
.hero-meta { color: var(--muted); margin: 0; font-size: 15px; }
.page-title { font-size: 26px; margin: 0 0 8px; }
.page-desc { color: var(--muted); margin: 0 0 24px; }

/* ===== 文章列表 ===== */
.post-list { display: flex; flex-direction: column; }
.post-item {
  padding: 22px 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: 18px;
  align-items: flex-start;
}
.post-item-main { flex: 1; min-width: 0; }
.post-cover { flex: none; width: 128px; border-radius: 10px; overflow: hidden; border: 1px solid var(--border); }
.post-cover img { display: block; width: 128px; height: 72px; object-fit: cover; }
.post-item:first-child { padding-top: 6px; }
.post-item-title { font-size: 21px; margin: 0 0 8px; line-height: 1.4; }
.post-item-title a { color: var(--text); }
.post-item-title a:hover { color: var(--accent); text-decoration: none; }
.post-meta { color: var(--muted); font-size: 13.5px; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.post-item-summary { color: var(--muted); margin: 10px 0 0; font-size: 15px; }

/* ===== 标签 ===== */
.tag {
  display: inline-block;
  padding: 1px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 13px;
  line-height: 1.7;
}
.tag:hover { text-decoration: none; filter: brightness(1.05); }
.tag-cloud { display: flex; flex-wrap: wrap; gap: 10px; }
.tag--big { font-size: 15px; padding: 5px 14px; }
.tag-count { opacity: 0.7; }

/* ===== 文章正文 ===== */
.post-head { margin-bottom: 20px; padding-bottom: 16px; border-bottom: 1px solid var(--border); }
.post-head h1 { font-size: 30px; line-height: 1.35; margin: 0 0 12px; }
.post-body { font-size: 16.5px; }
.post-body h2 { font-size: 24px; margin: 34px 0 14px; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
.post-body h3 { font-size: 20px; margin: 28px 0 12px; }
.post-body h4 { font-size: 17px; margin: 24px 0 10px; }
.post-body p { margin: 0 0 18px; }
.post-body a { text-decoration: underline; text-underline-offset: 3px; }
.post-body ul, .post-body ol { margin: 0 0 18px; padding-left: 26px; }
.post-body li { margin: 6px 0; }
.post-body blockquote {
  margin: 0 0 18px;
  padding: 4px 18px;
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 8px 8px 0;
  color: var(--muted);
}
.post-body blockquote p { margin: 10px 0; }
.post-body hr { border: none; border-top: 1px solid var(--border); margin: 32px 0; }
.post-body code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.9em;
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 6px;
}
.post-body pre { line-height: 1.6; overflow-x: auto; position: relative; }
.post-body pre code { background: none; padding: 0; font-size: 14px; }
.post-body .highlight {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 18px;
  overflow-x: auto;
  margin: 0 0 18px;
}
.post-body .highlight pre { margin: 0; padding: 0; border: none; background: transparent; overflow: visible; }
.post-body table { border-collapse: collapse; width: 100%; margin: 0 0 18px; font-size: 15px; }
.post-body th, .post-body td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.post-body th { background: var(--surface); font-weight: 600; }

/* 目录 */
.toc {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 20px;
  margin: 0 0 24px;
  font-size: 14.5px;
}
.toc .toc-title { font-weight: 600; margin-bottom: 6px; }
.toc ul { list-style: none; margin: 0; padding-left: 16px; }
.toc > ul { padding-left: 0; }
.toc a { color: var(--muted); }
.toc a:hover { color: var(--accent); }

/* ===== 归档 ===== */
.archive-year { margin-bottom: 28px; }
.archive-year h2 { font-size: 20px; margin: 0 0 10px; }
.archive-list { list-style: none; margin: 0; padding: 0; }
.archive-item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 7px 0;
  border-bottom: 1px dashed var(--border);
}
.archive-date { color: var(--muted); font-size: 13.5px; flex: none; width: 92px; font-variant-numeric: tabular-nums; }
.archive-item a { color: var(--text); }
.archive-item a:hover { color: var(--accent); text-decoration: none; }
.archive-tags { margin-left: auto; color: var(--muted); font-size: 12.5px; }

/* ===== 上下篇 ===== */
.post-pager {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 40px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  font-size: 14.5px;
}
.post-pager a { color: var(--muted); }
.post-pager a:hover { color: var(--accent); }

/* ===== 页脚 ===== */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 0 32px;
  color: var(--muted);
  font-size: 13.5px;
}
.site-footer p { margin: 0; }
.site-footer a { color: var(--muted); }

/* ===== 响应式 ===== */
@media (max-width: 560px) {
  .header-inner { height: auto; padding: 10px 0; }
  .hero h1 { font-size: 25px; }
  .post-head h1 { font-size: 25px; }
  .post-body { font-size: 16px; }
  .archive-item { flex-wrap: wrap; gap: 4px; }
  .archive-date { width: auto; }
  .archive-tags { margin-left: 0; }
  .post-pager { flex-direction: column; }
}

/* ===== 关于页头像 ===== */
.about-head { text-align: center; }
.about-avatar {
  width: 96px;
  height: 96px;
  border-radius: 24px;
  box-shadow: var(--shadow);
  margin-bottom: 12px;
}
.about-head h1 { margin-bottom: 0; }

/* ===== 评论区 ===== */
.post-comments { margin-top: 40px; }
.post-comments h2 { font-size: 20px; margin: 0 0 14px; }
.giscus { width: 100%; }



/* ===== 顶栏搜索 ===== */
.site-search { display: flex; }
.site-search input {
  width: 150px;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  font-size: 14px;
  outline: none;
}
.site-search input:focus { border-color: var(--accent); }
@media (max-width: 700px) {
  .header-inner { flex-direction: column; align-items: stretch; }
  .site-nav { justify-content: center; }
  .site-search input { width: 100%; }
}

/* ===== 搜索页 ===== */
.search-form { display: flex; gap: 8px; margin-bottom: 14px; }
.search-form input {
  flex: 1;
  min-width: 0;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
  font-size: 15px;
  outline: none;
}
.search-form input:focus { border-color: var(--accent); }
.search-form button {
  padding: 10px 20px;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: var(--on-accent);
  font-size: 15px;
  cursor: pointer;
}

/* ===== 相关文章 ===== */
.related-posts {
  margin-top: 36px;
  padding: 18px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--card-shadow);
}
.related-posts h2 { font-size: 17px; margin: 0 0 10px; }
.related-posts ul { list-style: none; margin: 0; padding: 0; }
.related-posts li { padding: 4px 0; }
.related-posts a { color: var(--text); }
.related-posts a:hover { color: var(--accent); text-decoration: none; }

/* ===== 回到顶部 ===== */
.back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .2s, transform .2s, visibility .2s;
  box-shadow: var(--shadow);
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: none; }

/* ===== 按钮 ===== */
.btn {
  display: inline-block;
  padding: 9px 20px;
  border-radius: 10px;
  background: var(--accent);
  color: var(--on-accent);
  font-size: 15px;
}
.btn:hover { text-decoration: none; filter: brightness(1.06); }
.btn-secondary { background: var(--surface); color: var(--accent); border: 1px solid var(--accent); }

/* ===== 404 ===== */
.notfound { text-align: center; padding: 60px 0; }
.notfound-actions { display: flex; gap: 12px; justify-content: center; margin-top: 20px; flex-wrap: wrap; }


/* ===== 文章封面横幅 ===== */
.post-cover-banner {
  display: block;
  width: 100%;
  max-height: 340px;
  object-fit: cover;
  border-radius: 14px;
  border: 1px solid var(--border);
  margin-bottom: 22px;
  box-shadow: var(--card-shadow);
}

/* ===== 阅读量 / 站点统计 ===== */
.post-views { color: var(--muted); }
.site-stats { margin-left: 8px; }

/* ===== 响应式：小屏缩略图缩小 ===== */
@media (max-width: 560px) {
  .post-cover, .post-cover img { width: 84px; }
  .post-cover img { height: 52px; }
}


/* ===== 分类 ===== */
.cat {
  display: inline-block;
  padding: 1px 12px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--on-accent);
  font-size: 13px;
  line-height: 1.7;
}
.cat:hover { text-decoration: none; filter: brightness(1.06); }

.cat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 12px; }
.cat-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  box-shadow: var(--card-shadow);
  transition: transform .15s, border-color .15s, box-shadow .15s;
}
.cat-card:hover { text-decoration: none; border-color: var(--accent); transform: translateY(-2px); box-shadow: 0 6px 16px rgba(0, 0, 0, 0.08); }
.cat-name { font-size: 17px; font-weight: 500; }
.cat-count { color: var(--muted); font-size: 13.5px; }


/* ===== 置顶徽章 ===== */
.sticky-badge {
  display: inline-block;
  padding: 1px 10px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--on-accent);
  font-size: 12.5px;
  line-height: 1.7;
}

/* ===== 更新日期 ===== */
.post-updated { color: var(--muted); }

/* ===== 分页 ===== */
.pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 32px;
  flex-wrap: wrap;
}
.page-btn {
  padding: 7px 14px;
  border: 1px solid var(--border);
  border-radius: 9px;
  color: var(--text);
  font-size: 14px;
  background: var(--surface);
}
.page-btn:hover { text-decoration: none; border-color: var(--accent); color: var(--accent); }
.page-btn.disabled { opacity: 0.45; pointer-events: none; }
.page-nums { display: flex; gap: 6px; }
.page-num {
  min-width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 14px;
  background: var(--surface);
}
.page-num:hover { text-decoration: none; border-color: var(--accent); color: var(--accent); }
.page-num.current { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }

/* ===== 代码复制按钮 ===== */
.copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  padding: 3px 12px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--surface);
  color: var(--muted);
  font-size: 12.5px;
  cursor: pointer;
  opacity: 0;
  transition: opacity .15s;
}
.post-body pre:hover .copy-btn, .copy-btn:focus-visible { opacity: 1; }
.copy-btn:hover { color: var(--accent); border-color: var(--accent); }


/* ===== 文章点评 ===== */
.post-feedback {
  margin-top: 36px;
  padding: 22px 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--card-shadow);
  text-align: center;
}
.feedback-title { margin: 0 0 14px; font-size: 16px; font-weight: 500; }
.feedback-buttons { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.feedback-buttons button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 22px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  font-size: 15px;
  cursor: pointer;
  transition: border-color .15s, background .15s, color .15s;
}
.feedback-buttons button:hover { border-color: var(--accent); color: var(--accent); }
.feedback-buttons button[data-vote="helpful"].active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
}
.feedback-buttons button[data-vote="unhelpful"].active {
  background: var(--muted);
  border-color: var(--muted);
  color: var(--on-accent);
}
.fb-count { font-variant-numeric: tabular-nums; }
.feedback-status { margin: 12px 0 0; min-height: 1.4em; color: var(--muted); font-size: 14px; }