:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --text: #1f2328;
  --muted: #6b7280;
  --border: #e7e7e9;
  --accent: #d9480f;
  --accent-soft: #fff1e8;
  --tag-bg: #f1f3f5;
  --tag-text: #495057;
  --code-inline-bg: #f3f4f6;
  --pre-bg: #f6f8fa;
  --radius: 12px;
  --maxw: 860px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
}

:root[data-theme="dark"] {
  --bg: #0f1115;
  --surface: #171a21;
  --text: #e6e8eb;
  --muted: #9aa3ad;
  --border: #262b33;
  --accent: #ff7a45;
  --accent-soft: #2a1c14;
  --tag-bg: #23272f;
  --tag-text: #c2c8d0;
  --code-inline-bg: #23272f;
  --pre-bg: #11141a;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

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

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px; height: 30px;
  background: var(--accent);
  color: #fff;
  border-radius: 8px;
  font-size: 16px;
}
.brand-name { font-size: 18px; letter-spacing: 1px; }
.nav { display: flex; gap: 22px; }
.nav a {
  color: var(--muted);
  font-size: 15px;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: color .15s, border-color .15s;
}
.nav a:hover, .nav a.active {
  color: var(--text);
  border-color: var(--accent);
}

/* Main */
main.container { padding-top: 40px; padding-bottom: 60px; min-height: 60vh; }
.loading { color: var(--muted); text-align: center; padding: 60px 0; }

/* Hero */
.hero { margin-bottom: 36px; }
.hero h1 { font-size: 30px; margin: 0 0 8px; letter-spacing: .5px; }
.hero p { color: var(--muted); margin: 0; }

/* Post list */
.post-list { display: grid; gap: 16px; }
.post-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
  box-shadow: var(--shadow);
  transition: transform .15s, border-color .15s, box-shadow .15s;
  cursor: pointer;
}
.post-card:hover {
  transform: translateY(-2px);
  border-color: #d9d9dc;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
}
.post-card h2 { font-size: 19px; margin: 0 0 8px; }
.post-card .excerpt { color: var(--muted); margin: 0 0 14px; font-size: 15px; }
.post-meta { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.post-date { color: var(--muted); font-size: 13px; }

/* Tags */
.tag {
  display: inline-block;
  background: var(--tag-bg);
  color: var(--tag-text);
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 999px;
  cursor: pointer;
  transition: background .15s, color .15s;
}
.tag:hover { background: var(--accent-soft); color: var(--accent); }
.tag.active { background: var(--accent); color: #fff; }

.tag-cloud { display: flex; flex-wrap: wrap; gap: 10px; margin: 20px 0 30px; }
.section-title { font-size: 20px; margin: 0 0 4px; }

/* Article */
.article { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 36px 40px; box-shadow: var(--shadow); }
.article-header { margin-bottom: 28px; border-bottom: 1px solid var(--border); padding-bottom: 22px; }
.article-header h1 { font-size: 28px; margin: 0 0 12px; line-height: 1.3; }
.article-header .post-meta { margin-bottom: 14px; }

/* Markdown content */
.markdown { font-size: 16px; }
.markdown h1, .markdown h2, .markdown h3 { line-height: 1.35; margin: 1.6em 0 .6em; }
.markdown h2 { font-size: 22px; border-left: 3px solid var(--accent); padding-left: 12px; }
.markdown h3 { font-size: 18px; }
.markdown p { margin: .9em 0; }
.markdown ul, .markdown ol { padding-left: 1.4em; }
.markdown li { margin: .3em 0; }
.markdown blockquote {
  margin: 1.2em 0;
  padding: 10px 18px;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  color: #5a3a26;
  border-radius: 0 8px 8px 0;
}
.markdown code {
  background: var(--code-inline-bg);
  padding: 2px 6px;
  border-radius: 5px;
  font-size: .9em;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}
.markdown pre {
  background: var(--pre-bg);
  padding: 16px 18px;
  border-radius: 10px;
  overflow-x: auto;
  border: 1px solid var(--border);
}
.markdown pre code { background: none; padding: 0; font-size: .88em; }
.markdown table { width: 100%; border-collapse: collapse; margin: 1.2em 0; font-size: 15px; }
.markdown th, .markdown td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.markdown th { background: #f7f7f8; }
.markdown img { max-width: 100%; border-radius: 8px; }
.markdown a { color: var(--accent); border-bottom: 1px solid transparent; }
.markdown a:hover { border-color: var(--accent); }

/* About */
.about { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 36px 40px; box-shadow: var(--shadow); }
.about h2 { font-size: 22px; margin-top: 0; }
.about .avatar {
  width: 84px; height: 84px; border-radius: 50%;
  background: var(--accent); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 36px; font-weight: 700; margin-bottom: 16px;
}

.back-link { display: inline-block; margin-bottom: 18px; color: var(--muted); font-size: 14px; }
.back-link:hover { color: var(--accent); }

.empty { text-align: center; color: var(--muted); padding: 50px 0; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 22px 0; color: var(--muted); font-size: 13px; }
.site-footer .container { display: flex; gap: 8px; flex-wrap: wrap; }
.site-footer .dot { opacity: .5; }

@media (max-width: 600px) {
  .article, .about { padding: 24px 20px; }
  .article-header h1 { font-size: 23px; }
  .hero h1 { font-size: 24px; }
}

/* 主题切换：平滑过渡 + 按钮 */
body { transition: background .2s ease, color .2s ease; }

/* 搜索框 */
.searchbar { padding: 20px 20px 0; }
#search-input {
  width: 100%;
  padding: 11px 16px;
  font-size: 15px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
#search-input::placeholder { color: var(--muted); }
#search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--accent); }

/* 分页 */
.pagination { display: flex; align-items: center; justify-content: center; gap: 8px; margin-top: 28px; flex-wrap: wrap; }
.pagination button, .pagination .page-num {
  min-width: 34px; height: 34px; padding: 0 10px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  border-radius: 8px; cursor: pointer; font-size: 14px;
  display: inline-flex; align-items: center; justify-content: center;
  transition: background .15s, border-color .15s, color .15s;
}
.pagination button:hover:not(:disabled), .pagination .page-num:hover { border-color: var(--accent); color: var(--accent); }
.pagination button:disabled { opacity: .45; cursor: default; }
.pagination .page-num.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.pagination .page-info { color: var(--muted); font-size: 13px; }

/* 归档 */
.archive-group { margin-bottom: 30px; }
.archive-group h2 { font-size: 18px; border-left: 3px solid var(--accent); padding-left: 12px; margin: 0 0 14px; }
.archive-list { list-style: none; margin: 0; padding: 0; }
.archive-list li { padding: 9px 0; border-bottom: 1px dashed var(--border); display: flex; gap: 14px; align-items: baseline; }
.archive-list .a-date { color: var(--muted); font-size: 13px; width: 56px; flex: none; font-variant-numeric: tabular-nums; }
.archive-list a { color: var(--text); }
.archive-list a:hover { color: var(--accent); }

/* 文章底部上一篇/下一篇 */
.post-nav { display: flex; gap: 14px; margin-top: 36px; padding-top: 22px; border-top: 1px solid var(--border); }
.post-nav .pn {
  flex: 1; min-width: 0;
  display: flex; flex-direction: column; gap: 4px;
  padding: 14px 16px;
  border: 1px solid var(--border); border-radius: 10px;
  background: var(--surface);
  transition: border-color .15s, transform .15s;
}
.post-nav .pn:hover { border-color: var(--accent); transform: translateY(-2px); }
.post-nav .pn-next { text-align: right; align-items: flex-end; }
.post-nav .pn span { font-size: 12px; color: var(--muted); }
.post-nav .pn strong {
  font-size: 15px; font-weight: 600; color: var(--text);
  overflow: hidden; text-overflow: ellipsis; display: -webkit-box;
  -webkit-line-clamp: 1; -webkit-box-orient: vertical;
}
.post-nav .pn.disabled { visibility: hidden; }

/* 阅读量 */
.post-views { color: var(--muted); font-size: 13px; margin-left: auto; white-space: nowrap; }
.post-meta { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }

/* 评论区（Giscus，默认关闭，启用后显示） */
.comments { margin-top: 38px; padding-top: 24px; border-top: 1px solid var(--border); }

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  width: 34px; height: 34px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 15px;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-left: 6px;
  transition: background .15s, border-color .15s;
}
.theme-toggle:hover { background: var(--tag-bg); border-color: var(--accent); }

:root[data-theme="dark"] .site-header {
  background: rgba(23, 26, 33, 0.85);
}
:root[data-theme="dark"] .nav a:hover,
:root[data-theme="dark"] .nav a.active { color: var(--text); }