:root {
  --color-bg: #fafafa;
  --color-surface: #fff;
  --color-text: #1a1a1a;
  --color-muted: #666;
  --color-primary: #2563eb;
  --color-border: #e5e7eb;
  --font-sans: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --page-max-width: 1240px;
  --page-max-width-xl: 1400px;
  --sidebar-width: 17rem;
  --layout-gap: 1.25rem;
  --article-readable-width: 48rem;
  --content-width: var(--article-readable-width);
  --radius: 8px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #0f1115;
    --color-surface: #1a1d24;
    --color-text: #e8eaed;
    --color-muted: #9aa0a6;
    --color-border: #2d323c;
  }
}

[data-theme="dark"] {
  --color-bg: #0f1115;
  --color-surface: #1a1d24;
  --color-text: #e8eaed;
  --color-muted: #9aa0a6;
  --color-border: #2d323c;
}

[data-theme="light"] {
  --color-bg: #fafafa;
  --color-surface: #fff;
  --color-text: #1a1a1a;
  --color-muted: #666;
  --color-border: #e5e7eb;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  font-size: clamp(1rem, 2.5vw, 1.0625rem);
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: var(--page-max-width); margin: 0 auto; padding: 0 1.25rem; }

@media (min-width: 1400px) {
  .container { max-width: var(--page-max-width-xl); }
}

.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 3.5rem;
}

.logo { font-weight: 700; font-size: 1.125rem; color: var(--color-text); text-decoration: none; display: inline-flex; align-items: center; gap: 0.5rem; }
.logo .site-logo { width: 2rem; height: 2rem; object-fit: contain; border-radius: 6px; flex-shrink: 0; }
.logo .logo-text { line-height: 1.2; }
.nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.35rem 1.25rem;
}
.nav a, .nav button {
  margin-left: 0;
  color: var(--color-muted);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0;
  white-space: nowrap;
}
.nav a.nav-sub {
  font-size: 0.9em;
  opacity: 0.85;
}
.nav a i, .nav button i { font-size: 1.05em; }
.nav a:hover { color: var(--color-primary); }
.nav-toggle { background: none; border: none; font-size: 1.35rem; color: var(--color-text); cursor: pointer; padding: 0.25rem; }
.theme-toggle { background: none; border: none; cursor: pointer; font-size: 1.15rem; color: var(--color-muted); padding: 0; }
.theme-icon-light { display: none; }
[data-theme="dark"] .theme-icon-dark { display: none; }
[data-theme="dark"] .theme-icon-light { display: inline; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-icon-dark { display: none; }
  :root:not([data-theme="light"]) .theme-icon-light { display: inline; }
}
[data-theme="light"] .theme-icon-dark { display: inline; }
[data-theme="light"] .theme-icon-light { display: none; }

.post-card .meta a,
.post-card .meta time {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  margin-right: 0.75rem;
}
.widget h3 { display: flex; align-items: center; gap: 0.4rem; margin-bottom: 0.75rem; font-size: 1rem; }
.search-form { display: flex; gap: 0.5rem; }
.search-form button {
  border: 1px solid var(--color-border);
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius);
  padding: 0 0.75rem;
  cursor: pointer;
}
.breadcrumb a { display: inline-flex; align-items: center; gap: 0.25rem; }
.comments h2 { display: flex; align-items: center; gap: 0.4rem; }
.post-single .meta a,
.post-single .meta time,
.post-single .meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  margin-right: 1rem;
}

.layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--layout-gap);
  padding: 2rem 0 3rem;
  align-items: start;
}

@media (min-width: 992px) {
  .layout {
    grid-template-columns: minmax(0, 1fr) var(--sidebar-width);
    column-gap: var(--layout-gap);
  }
}

.sidebar {
  min-width: 0;
  width: 100%;
}

/* 有侧栏时主栏占满剩余栅格，避免 42rem 上限造成大块空白 */
.content {
  min-width: 0;
  width: 100%;
  max-width: var(--content-width);
}

@media (min-width: 992px) {
  .layout:has(.sidebar) .content {
    max-width: none;
  }
}

/* 无侧栏单列页（如部分首页）保持适中阅读宽度 */
.layout:not(:has(.sidebar)) .content {
  max-width: min(var(--article-readable-width), 100%);
}

.page-title { font-size: 1.5rem; margin-bottom: 1.5rem; }

.post-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: 1.25rem;
  overflow: hidden;
}

.post-card-cover img { width: 100%; height: 12rem; object-fit: cover; display: block; }
.post-card-body { padding: 1.25rem; }
.post-card h2 { font-size: 1.25rem; margin-bottom: 0.5rem; }
.post-card h2 a { color: var(--color-text); text-decoration: none; }
.post-card .excerpt { color: var(--color-muted); margin-bottom: 0.75rem; }
.post-card .meta { font-size: 0.875rem; color: var(--color-muted); display: flex; gap: 1rem; }

.post-single header { margin-bottom: 1.5rem; }
.post-single h1 { font-size: clamp(1.5rem, 4vw, 2rem); line-height: 1.3; margin-bottom: 0.75rem; }
.post-single .meta { color: var(--color-muted); font-size: 0.9rem; display: flex; flex-wrap: wrap; gap: 1rem; }
.post-single .post-tags,
.post-single .tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin-top: 0.85rem;
}
.post-single .post-tags .tag-pill,
.post-single .tags .tag-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}
.post-single .category-path-group {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.2rem;
}
.post-single .category-path-group .sep {
  color: var(--color-muted);
  font-size: 0.8rem;
  user-select: none;
}
.post-single .cover { width: 100%; border-radius: var(--radius); margin-bottom: 1.5rem; }
.post-content {
  font-size: 1.0625rem;
  max-width: 75ch;
}
.post-content img { max-width: 100%; height: auto; border-radius: var(--radius); }
.post-content pre {
  background: #1e293b;
  color: #e2e8f0;
  padding: 1rem;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 1rem 0;
}
.post-content code { font-family: ui-monospace, monospace; font-size: 0.9em; }

.sidebar .widget {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem;
  margin-bottom: 1rem;
  min-width: 0;
  overflow: hidden;
}
.sidebar .search-form {
  display: flex;
  gap: 0.5rem;
  width: 100%;
  min-width: 0;
}
.sidebar .search-form input[type="search"] {
  flex: 1 1 auto;
  min-width: 0;
  width: 100%;
  max-width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-text);
}
.sidebar .search-form button {
  flex: 0 0 auto;
  border: 1px solid var(--color-border);
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius);
  padding: 0 0.65rem;
  cursor: pointer;
  min-width: 2.25rem;
}

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 2rem 0;
  text-align: center;
  color: var(--color-muted);
  font-size: 0.875rem;
}

.pagination { display: flex; gap: 1rem; margin-top: 2rem; }
.empty { color: var(--color-muted); padding: 2rem 0; }
.author-header { margin-bottom: 2rem; }

.nav-toggle, .theme-toggle {
  background: none; border: 1px solid var(--color-border); border-radius: 4px;
  padding: 0.35rem 0.6rem; cursor: pointer; color: var(--color-text); font-size: 1rem;
}
.nav-toggle { display: none; }
@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav { display: none; position: absolute; top: 100%; left: 0; right: 0; background: var(--color-surface); border-bottom: 1px solid var(--color-border); flex-direction: column; align-items: flex-start; gap: 0.5rem; padding: 1rem; }
  .nav.open { display: flex; }
  .nav a, .nav .theme-toggle { margin: 0; }
  .header-inner { position: relative; flex-wrap: wrap; }
}

.breadcrumb { font-size: 0.875rem; color: var(--color-muted); margin-bottom: 1rem; }
.breadcrumb .sep { margin: 0 0.35rem; }

.search-form { display: flex; gap: 0.5rem; }
.search-form input { flex: 1; padding: 0.5rem 0.75rem; border: 1px solid var(--color-border); border-radius: var(--radius); background: var(--color-surface); color: var(--color-text); }
.search-form button, .btn { padding: 0.5rem 1rem; background: var(--color-primary); color: #fff; border: none; border-radius: var(--radius); cursor: pointer; }
.search-page-form { margin-bottom: 1.5rem; }
.search-result-count { color: var(--color-muted); margin-bottom: 1rem; }

.post-layout { display: grid; gap: var(--layout-gap); }
@media (min-width: 992px) {
  .post-layout { grid-template-columns: minmax(0, 1fr) 13rem; column-gap: var(--layout-gap); }
  .post-layout .post-content { max-width: none; }
}
.toc {
  display: none;
  position: sticky;
  top: 4rem;
  align-self: start;
  font-size: 0.85rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem;
}
.toc > strong {
  display: block;
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}
.toc ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.toc li {
  margin-bottom: 0.45rem;
  line-height: 1.55;
}
.toc li:last-child {
  margin-bottom: 0;
}
.toc li.h3 {
  padding-left: 0.75rem;
}
.toc a {
  color: var(--color-muted);
  text-decoration: none;
  transition: color 0.15s ease;
}
.toc a:hover {
  color: var(--color-primary);
}

.comments { margin-top: 2.5rem; padding-top: 2rem; border-top: 1px solid var(--color-border); }
.comment-form { display: flex; flex-direction: column; gap: 0.75rem; margin-bottom: 1.5rem; }
.comment-form input, .comment-form textarea { padding: 0.5rem; border: 1px solid var(--color-border); border-radius: var(--radius); background: var(--color-surface); color: var(--color-text); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }
.comment-list { list-style: none; }
.comment-item { padding: 1rem 0; border-bottom: 1px solid var(--color-border); }
.comment-row {
  display: flex;
  gap: 0.85rem;
  align-items: flex-start;
}
.comment-avatar {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}
.comment-item.reply .comment-avatar {
  width: 36px;
  height: 36px;
}
.comment-main { flex: 1; min-width: 0; }
.comment-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.65rem;
  margin-bottom: 0.35rem;
}
.comment-author { font-size: 0.95rem; }
.comment-site { font-size: 0.8rem; color: var(--color-muted); }
.comment-text { margin: 0 0 0.5rem; line-height: 1.65; }
.comment-replies { list-style: none; margin: 0.75rem 0 0 3.25rem; padding-left: 0.75rem; border-left: 2px solid var(--color-border); }
.comment-item.reply { padding: 0.75rem 0; border-bottom: none; }
.reply-btn { background: none; border: none; color: var(--color-primary); cursor: pointer; font-size: 0.875rem; padding: 0; }
.form-row { display: flex; gap: 0.75rem; }
.form-row input { flex: 1; }
.related-posts { margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid var(--color-border); }
.related-grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
.related-card { margin: 0; }
.copy-code-btn { position: absolute; top: 0.5rem; right: 0.5rem; font-size: 0.75rem; padding: 0.25rem 0.5rem; border: 1px solid var(--color-border); border-radius: var(--radius); background: var(--color-surface); cursor: pointer; }
.comment-head time { color: var(--color-muted); font-size: 0.85rem; }
.comment-hint, .comment-closed, .comment-empty { color: var(--color-muted); font-size: 0.875rem; }

.error-page { text-align: center; padding: 4rem 0; }
.error-page h1 { font-size: 4rem; color: var(--color-muted); }

/* ---- Enhanced UI ---- */
.site-hero {
  background: linear-gradient(135deg, var(--color-surface) 0%, color-mix(in srgb, var(--color-primary) 8%, var(--color-surface)) 100%);
  border: 1px solid var(--color-border);
  border-radius: calc(var(--radius) + 4px);
  padding: 2.5rem 2rem;
  margin-bottom: 2rem;
}
.hero-title { font-size: clamp(1.75rem, 4vw, 2.25rem); line-height: 1.25; margin-bottom: 0.5rem; }
.hero-subtitle { font-size: 1.05rem; color: var(--color-muted); margin-bottom: 0.35rem; }
.hero-desc { color: var(--color-muted); font-size: 0.95rem; max-width: 40rem; }
.section-title {
  display: flex; align-items: center; gap: 0.5rem;
  font-size: 1.125rem; margin-bottom: 1rem; color: var(--color-text);
}

.post-card { position: relative; transition: box-shadow 0.2s, transform 0.2s; }
.post-card:hover { box-shadow: 0 8px 24px rgba(0,0,0,0.06); transform: translateY(-1px); }
.post-card.is-pinned { border-color: color-mix(in srgb, var(--color-primary) 35%, var(--color-border)); }
.pin-badge {
  position: absolute; top: 0.75rem; left: 0.75rem; z-index: 2;
  background: var(--color-primary); color: #fff; font-size: 0.75rem;
  padding: 0.15rem 0.5rem; border-radius: 999px; display: inline-flex; align-items: center; gap: 0.25rem;
}
.pin-badge.inline { position: static; margin-bottom: 0.75rem; }
.card-tags { margin-top: 0.75rem; display: flex; flex-wrap: wrap; gap: 0.35rem; }

.tag-pill {
  display: inline-block; background: var(--color-bg); border: 1px solid var(--color-border);
  color: var(--color-muted); padding: 0.2rem 0.55rem; border-radius: 999px; font-size: 0.8rem; text-decoration: none;
}
.tag-pill:hover { color: var(--color-primary); border-color: color-mix(in srgb, var(--color-primary) 40%, var(--color-border)); text-decoration: none; }
.tag-pill.sm { font-size: 0.75rem; padding: 0.1rem 0.45rem; }
.tag-cloud { display: flex; flex-wrap: wrap; gap: 0.4rem; }

.sidebar-posts, .sidebar-categories { list-style: none; }
.sidebar-posts li, .sidebar-categories li { margin-bottom: 0.45rem; font-size: 0.9rem; }
.sidebar-posts a { color: var(--color-text); text-decoration: none; }
.sidebar-posts a:hover { color: var(--color-primary); }
.sidebar-categories li { display: flex; justify-content: space-between; gap: 0.5rem; }
.sidebar-categories .count { color: var(--color-muted); font-size: 0.8rem; }
.about-text { color: var(--color-muted); font-size: 0.9rem; line-height: 1.6; }

.empty-state {
  text-align: center; padding: 3rem 1rem; color: var(--color-muted);
  background: var(--color-surface); border: 1px dashed var(--color-border); border-radius: var(--radius);
}
.empty-state i { font-size: 2rem; display: block; margin-bottom: 0.75rem; opacity: 0.6; }

.card-panel {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius); padding: 1.5rem; margin-bottom: 1.5rem;
}
.author-header { display: flex; gap: 1rem; align-items: flex-start; }
.author-avatar {
  width: 4rem; height: 4rem; border-radius: 50%; background: color-mix(in srgb, var(--color-primary) 12%, var(--color-bg));
  display: flex; align-items: center; justify-content: center; font-size: 1.75rem; color: var(--color-primary); flex-shrink: 0;
}
.author-avatar.sm { width: 3rem; height: 3rem; font-size: 1.35rem; }
.author-bio { color: var(--color-muted); margin-top: 0.35rem; }
.author-grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.author-card h2 { font-size: 1.1rem; margin: 0.5rem 0; }
.author-card p { color: var(--color-muted); font-size: 0.9rem; margin-bottom: 0.75rem; }
.read-more { font-size: 0.875rem; display: inline-flex; align-items: center; gap: 0.25rem; }

.site-footer { padding: 2.5rem 0; text-align: left; }
.footer-inner { display: grid; gap: 1rem; }
.footer-brand strong { font-size: 1rem; }
.footer-brand p { color: var(--color-muted); font-size: 0.875rem; margin-top: 0.35rem; }
.footer-links { display: flex; flex-wrap: wrap; gap: 1rem; }
.footer-links a { color: var(--color-muted); font-size: 0.875rem; text-decoration: none; }
.footer-links a:hover { color: var(--color-primary); }
.footer-bottom { margin-top: 0.5rem; display: flex; flex-direction: column; gap: 0.35rem; }
.footer-copy { color: var(--color-muted); font-size: 0.8rem; margin: 0; }
.footer-beian { margin: 0; font-size: 0.75rem; color: var(--color-muted); display: flex; flex-wrap: wrap; align-items: center; gap: 0.35rem; }
.footer-beian a { color: var(--color-muted); text-decoration: none; }
.footer-beian a:hover { color: var(--color-primary); }
.footer-beian .sep { opacity: 0.6; }
.footer-widgets {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  margin-top: 0.5rem;
  text-align: left;
}
.footer-widgets .widget {
  background: transparent;
  border: 0;
  padding: 0;
  margin: 0;
}
.footer-widgets .widget h3 {
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}

.back-to-top {
  position: fixed; right: 1.25rem; bottom: 1.25rem; width: 2.5rem; height: 2.5rem;
  border-radius: 50%; border: 1px solid var(--color-border); background: var(--color-surface);
  color: var(--color-text); cursor: pointer; box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  opacity: 0; visibility: hidden; transition: opacity 0.2s, visibility 0.2s; z-index: 20;
}
.back-to-top.visible { opacity: 1; visibility: visible; }

.toast {
  position: fixed; left: 50%; bottom: 1.5rem; transform: translateX(-50%) translateY(20px);
  background: #1d2327; color: #fff; padding: 0.65rem 1rem; border-radius: var(--radius);
  font-size: 0.875rem; opacity: 0; transition: opacity 0.25s, transform 0.25s; z-index: 30; pointer-events: none;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

.post-content blockquote {
  border-left: 4px solid var(--color-primary); margin: 1.25rem 0; padding: 0.5rem 0 0.5rem 1rem;
  color: var(--color-muted); background: color-mix(in srgb, var(--color-primary) 5%, transparent);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.post-content table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: 0.95rem; }
.post-content th, .post-content td { border: 1px solid var(--color-border); padding: 0.5rem 0.75rem; }
.post-content th { background: var(--color-bg); }
.post-content h2, .post-content h3, .post-content h4 { margin: 1.75rem 0 0.75rem; line-height: 1.35; }
.post-content ul, .post-content ol { padding-left: 1.5rem; margin: 0.75rem 0; }
.post-content p { margin: 0.75rem 0; }
.post-content pre { position: relative; }
.post-content pre code { background: transparent; color: inherit; }

.related-posts h3, .related-posts h2 { font-size: 1.1rem; margin-bottom: 0.75rem; }
.related-card h3 { font-size: 1rem; margin: 0; }
.related-card .post-card-body { padding: 1rem; }

.comment-form button {
  align-self: flex-start; display: inline-flex; align-items: center; gap: 0.35rem;
  padding: 0.55rem 1rem; background: var(--color-primary); color: #fff; border: none;
  border-radius: var(--radius); cursor: pointer;
}

.taxonomy-desc { color: var(--color-muted); margin: -0.5rem 0 1.25rem; }

.category-children {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: -0.25rem 0 1.25rem;
  padding: 0.75rem 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}
.category-child-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.75rem;
  font-size: 0.875rem;
  color: var(--color-text);
  text-decoration: none;
  border-radius: 999px;
  background: var(--color-bg);
}
.category-child-link:hover { color: var(--color-primary); }
.category-child-link .count { color: var(--color-muted); font-size: 0.8em; }

.category-path-group { display: inline-flex; flex-wrap: wrap; align-items: center; gap: 0.15rem; }
.category-path-group .sep { color: var(--color-muted); margin: 0 0.1rem; user-select: none; }
.card-tags .category-path-group { gap: 0.2rem; }

ul.sidebar-categories.tree li { list-style: none; }

.widget-text { font-size: 0.9rem; line-height: 1.7; color: var(--color-muted); }
.widget-text p { margin: 0 0 0.75rem; }
.widget-text p:last-child { margin-bottom: 0; }
.widget-text-plain {
  white-space: pre-wrap;
  font-family: inherit;
  font-size: 0.9rem;
  color: var(--color-muted);
  background: transparent;
  border: 0;
  padding: 0;
  margin: 0;
}
.widget-cta-wrap { margin-top: 0.75rem; margin-bottom: 0; }
.widget-cta-btn {
  display: inline-block;
  padding: 0.45rem 0.9rem;
  background: var(--color-primary);
  color: #fff !important;
  border-radius: var(--radius);
  font-size: 0.875rem;
  text-decoration: none !important;
}
.widget-cta-btn:hover { opacity: 0.92; }

.widget-ad .widget-ad-body { line-height: 0; }
.widget-ad-link { display: block; text-decoration: none; }
.widget-ad-media {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
  background: var(--color-bg);
}
.widget-ad-media video { width: 100%; height: auto; border-radius: var(--radius); }
.widget-ad-caption {
  margin: 0.5rem 0 0;
  font-size: 0.8rem;
  color: var(--color-muted);
  line-height: 1.5;
}

@media print {
  .site-header, .sidebar, .comments, .nav-toggle, .theme-toggle { display: none !important; }
  .layout { display: block; padding: 0; }
  a { color: inherit; text-decoration: underline; }
}