:root {
  --bg: #0d1117;
  --bg-soft: #131a23;
  --bg-card: #161d27;
  --bg-code: #0b0f16;
  --text: #d7dee8;
  --text-dim: #8b97a8;
  --text-strong: #f2f6fb;
  --border: #232c39;
  --border-soft: #1c242f;
  --brand: #4dd0b1;
  --brand-2: #5b8cff;
  --brand-3: #b57bff;
  --warn: #f7c46c;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0, 0, 0, .35);
  --maxw: 1180px;
  --mono: "JetBrains Mono", "Fira Code", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

html[data-theme="light"] {
  --bg: #f6f8fb;
  --bg-soft: #eef2f7;
  --bg-card: #ffffff;
  --bg-code: #f3f6fa;
  --text: #3b4557;
  --text-dim: #6b7889;
  --text-strong: #101828;
  --border: #e2e8f0;
  --border-soft: #edf1f6;
  --brand: #0f9b7d;
  --brand-2: #2f6bf2;
  --brand-3: #7c4dff;
  --shadow: 0 10px 30px rgba(16, 24, 40, .08);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  transition: background .25s ease, color .25s ease;
}

a { color: var(--brand-2); text-decoration: none; }
a:hover { color: var(--brand); }

img { max-width: 100%; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

.mono { font-family: var(--mono); }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--border-soft);
}

.nav {
  display: flex;
  align-items: center;
  gap: 18px;
  height: 62px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 18px;
  color: var(--text-strong);
  letter-spacing: .3px;
  white-space: nowrap;
}

.logo .dot {
  width: 26px; height: 26px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2) 60%, var(--brand-3));
  display: inline-flex; align-items: center; justify-content: center;
  color: #061018; font-size: 14px; font-weight: 900;
}

.nav-links {
  display: flex;
  gap: 4px;
  margin-left: 10px;
  flex: 1;
}

.nav-links a {
  color: var(--text-dim);
  padding: 7px 12px;
  border-radius: 9px;
  font-size: 15px;
  font-weight: 500;
  transition: .18s;
}

.nav-links a:hover { color: var(--text-strong); background: var(--bg-soft); }
.nav-links a.active { color: var(--brand); background: var(--bg-soft); }

.nav-right { display: flex; align-items: center; gap: 10px; }

.icon-btn {
  width: 36px; height: 36px;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-dim);
  border-radius: 10px;
  cursor: pointer;
  font-size: 15px;
  transition: .18s;
}

.icon-btn:hover { color: var(--brand); border-color: var(--brand); }

.search-box {
  position: relative;
  display: flex;
  align-items: center;
}

.search-box input {
  width: 190px;
  height: 36px;
  padding: 0 34px 0 32px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  font-size: 14px;
  outline: none;
  transition: .18s;
}

.search-box input:focus { border-color: var(--brand); width: 240px; }
.search-box .si { position: absolute; left: 11px; color: var(--text-dim); font-size: 13px; }
.search-box kbd {
  position: absolute; right: 8px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 0 5px;
  background: var(--bg-soft);
}

/* search suggestions */
.suggest {
  position: absolute;
  top: 44px; right: 0;
  width: 340px;
  max-height: 380px;
  overflow: auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 6px;
  display: none;
  z-index: 80;
}

.suggest.show { display: block; }
.suggest a {
  display: block;
  padding: 9px 11px;
  border-radius: 9px;
  color: var(--text);
  font-size: 14px;
  line-height: 1.45;
}
.suggest a:hover { background: var(--bg-soft); color: var(--brand); }
.suggest a small { display: block; color: var(--text-dim); font-size: 12px; }
.suggest .empty { padding: 14px; text-align: center; color: var(--text-dim); font-size: 13px; }

/* ---------- hero ---------- */
.hero {
  position: relative;
  padding: 72px 0 54px;
  overflow: hidden;
  border-bottom: 1px solid var(--border-soft);
  background:
    radial-gradient(900px 340px at 12% -10%, rgba(77, 208, 177, .16), transparent 60%),
    radial-gradient(760px 320px at 88% 0%, rgba(91, 140, 255, .16), transparent 62%);
}

.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(30px, 4.4vw, 48px);
  line-height: 1.2;
  color: var(--text-strong);
  letter-spacing: -.5px;
}

.hero h1 .grad {
  background: linear-gradient(100deg, var(--brand), var(--brand-2) 55%, var(--brand-3));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero p.lead {
  margin: 0 0 26px;
  max-width: 680px;
  color: var(--text-dim);
  font-size: 17px;
}

.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 42px;
  padding: 0 20px;
  border-radius: 11px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid var(--border);
  color: var(--text-strong);
  background: var(--bg-card);
  cursor: pointer;
  transition: .18s;
}

.btn:hover { transform: translateY(-1px); border-color: var(--brand); color: var(--brand); }

.btn.primary {
  background: linear-gradient(120deg, var(--brand), var(--brand-2));
  border-color: transparent;
  color: #061018;
}

.btn.primary:hover { color: #000; filter: brightness(1.06); }

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-top: 42px;
}

.stat {
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 16px 18px;
}

.stat b {
  display: block;
  font-size: 24px;
  color: var(--text-strong);
  font-family: var(--mono);
}

.stat span { font-size: 13px; color: var(--text-dim); }

/* ---------- section ---------- */
.section { padding: 54px 0; }

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

.section-head h2 {
  margin: 0;
  font-size: 23px;
  color: var(--text-strong);
  letter-spacing: -.2px;
}

.section-head p { margin: 6px 0 0; color: var(--text-dim); font-size: 14px; }

.section-head .more { font-size: 14px; white-space: nowrap; }

/* ---------- cards ---------- */
.grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 20px;
  transition: .2s;
  overflow: hidden;
}

.card::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--brand), var(--brand-2), var(--brand-3));
  opacity: 0;
  transition: .2s;
}

.card:hover { transform: translateY(-3px); border-color: var(--border); box-shadow: var(--shadow); }
.card:hover::after { opacity: 1; }

.card .meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12.5px;
  color: var(--text-dim);
  font-family: var(--mono);
}

.card h3 {
  margin: 0;
  font-size: 17.5px;
  line-height: 1.45;
  color: var(--text-strong);
}

.card h3 a { color: inherit; }
.card h3 a:hover { color: var(--brand); }

.card p {
  margin: 0;
  color: var(--text-dim);
  font-size: 14.5px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.tags { display: flex; flex-wrap: wrap; gap: 7px; }

.tag {
  font-size: 12px;
  font-family: var(--mono);
  padding: 2px 9px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text-dim);
  background: var(--bg-soft);
  transition: .15s;
}

a.tag:hover { color: var(--brand); border-color: var(--brand); }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 34px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-dim);
  font-size: 14px;
  cursor: pointer;
  transition: .15s;
}

.chip:hover { color: var(--text-strong); border-color: var(--brand); }
.chip.active { background: var(--brand); border-color: var(--brand); color: #061018; font-weight: 600; }

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  padding: 16px 0 22px;
}

/* ---------- category tiles ---------- */
.cat-grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); }

.cat {
  padding: 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border-soft);
  background: var(--bg-card);
  transition: .2s;
}

.cat:hover { transform: translateY(-3px); border-color: var(--brand); }

.cat .ico {
  width: 38px; height: 38px;
  border-radius: 10px;
  display: grid; place-items: center;
  font-size: 18px;
  margin-bottom: 10px;
  font-family: var(--mono);
  background: var(--bg-soft);
  border: 1px solid var(--border);
}

.cat b { display: block; color: var(--text-strong); font-size: 15.5px; }
.cat small { color: var(--text-dim); font-size: 13px; }

/* ---------- article list ---------- */
.post-list { display: flex; flex-direction: column; gap: 0; }

.post-row {
  display: grid;
  grid-template-columns: 108px 1fr;
  gap: 20px;
  padding: 22px 4px;
  border-bottom: 1px dashed var(--border);
}

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

.post-row .date {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-dim);
  padding-top: 3px;
}

.post-row h3 { margin: 0 0 6px; font-size: 18px; color: var(--text-strong); }
.post-row h3 a { color: inherit; }
.post-row h3 a:hover { color: var(--brand); }
.post-row p { margin: 0 0 10px; color: var(--text-dim); font-size: 14.5px; }

/* ---------- article page ---------- */
.reading-bar {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--brand), var(--brand-2), var(--brand-3));
  z-index: 100;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 250px;
  gap: 34px;
  padding: 34px 0 60px;
  align-items: start;
}

.breadcrumb { font-size: 13.5px; color: var(--text-dim); margin-bottom: 14px; }
.breadcrumb a { color: var(--text-dim); }
.breadcrumb a:hover { color: var(--brand); }

.article {
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 34px 38px 40px;
}

.article h1 {
  margin: 8px 0 14px;
  font-size: clamp(24px, 3vw, 33px);
  line-height: 1.3;
  color: var(--text-strong);
  letter-spacing: -.3px;
}

.article .meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 13.5px;
  color: var(--text-dim);
  font-family: var(--mono);
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border-soft);
  margin-bottom: 8px;
}

/* markdown body */
.md { font-size: 16.2px; color: var(--text); }
.md h2 {
  margin: 38px 0 14px;
  font-size: 22px;
  color: var(--text-strong);
  padding-left: 12px;
  border-left: 3px solid var(--brand);
  line-height: 1.35;
}
.md h3 { margin: 28px 0 12px; font-size: 18px; color: var(--text-strong); }
.md h4 { margin: 22px 0 10px; font-size: 16px; color: var(--text-strong); }
.md p { margin: 0 0 16px; }
.md ul, .md ol { margin: 0 0 16px; padding-left: 22px; }
.md li { margin: 5px 0; }
.md blockquote {
  margin: 18px 0;
  padding: 12px 16px;
  border-left: 3px solid var(--brand-3);
  background: var(--bg-soft);
  border-radius: 0 10px 10px 0;
  color: var(--text-dim);
}
.md blockquote p:last-child { margin-bottom: 0; }
.md code {
  font-family: var(--mono);
  font-size: 13.6px;
  background: var(--bg-code);
  border: 1px solid var(--border-soft);
  padding: 1.5px 6px;
  border-radius: 6px;
  color: var(--brand);
  word-break: break-word;
}
.md pre {
  position: relative;
  margin: 18px 0;
  padding: 16px 18px;
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: auto;
  line-height: 1.65;
}
.md pre code {
  display: block;
  background: none;
  border: none;
  padding: 0;
  color: var(--text);
  font-size: 13.6px;
  white-space: pre;
}
.md pre .copy {
  position: absolute;
  top: 9px; right: 9px;
  font-size: 11.5px;
  padding: 3px 9px;
  border-radius: 7px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-dim);
  cursor: pointer;
  opacity: 0;
  transition: .15s;
  font-family: var(--mono);
}
.md pre:hover .copy { opacity: 1; }
.md pre .copy:hover { color: var(--brand); border-color: var(--brand); }

.md table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 14.5px;
  display: block;
  overflow-x: auto;
}
.md th, .md td { border: 1px solid var(--border); padding: 9px 12px; text-align: left; }
.md th { background: var(--bg-soft); color: var(--text-strong); }
.md hr { border: none; border-top: 1px dashed var(--border); margin: 30px 0; }
.md img { border-radius: 10px; border: 1px solid var(--border); }

/* syntax highlight */
.tk-key { color: var(--brand-3); }
.tk-str { color: #7ee787; }
.tk-num { color: #ffab70; }
.tk-com { color: #6b7889; font-style: italic; }
.tk-fn { color: #79c0ff; }
.tk-kw { color: #ff7b72; }
.tk-op { color: var(--text-dim); }

html[data-theme="light"] .tk-str { color: #0a7a3d; }
html[data-theme="light"] .tk-num { color: #b95000; }
html[data-theme="light"] .tk-kw { color: #cf222e; }
html[data-theme="light"] .tk-fn { color: #0550ae; }
html[data-theme="light"] .tk-key { color: #8250df; }

/* toc */
.side { position: sticky; top: 80px; display: flex; flex-direction: column; gap: 16px; }

.side-box {
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 16px 18px;
}

.side-box h4 {
  margin: 0 0 10px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-dim);
}

.toc a {
  display: block;
  font-size: 13.6px;
  color: var(--text-dim);
  padding: 5px 0 5px 10px;
  border-left: 2px solid var(--border);
  line-height: 1.5;
}

.toc a:hover, .toc a.active { color: var(--brand); border-left-color: var(--brand); }
.toc a.lv3 { padding-left: 22px; font-size: 13px; }

/* ---------- pager ---------- */
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 22px; }
.pager a {
  display: block;
  padding: 16px 18px;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  background: var(--bg-card);
  color: var(--text);
  transition: .18s;
}
.pager a:hover { border-color: var(--brand); }
.pager a small { display: block; color: var(--text-dim); font-size: 12px; font-family: var(--mono); }
.pager a b { color: var(--text-strong); font-size: 15px; font-weight: 600; }
.pager .next { text-align: right; }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--border-soft);
  background: var(--bg-soft);
  padding: 40px 0 28px;
  margin-top: 30px;
}

.foot-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 26px;
}

.foot-grid h5 { margin: 0 0 12px; font-size: 14px; color: var(--text-strong); }
.foot-grid a { display: block; color: var(--text-dim); font-size: 14px; padding: 3px 0; }
.foot-grid a:hover { color: var(--brand); }
.foot-about p { color: var(--text-dim); font-size: 14px; margin: 10px 0 0; }

.foot-bottom {
  margin-top: 30px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  align-items: center;
  justify-content: space-between;
  font-size: 13.5px;
  color: var(--text-dim);
}

.beian { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.beian a { color: var(--text-dim); }
.beian a:hover { color: var(--brand); }
.beian .sep { opacity: .4; }

/* ---------- misc ---------- */
.empty-state {
  text-align: center;
  padding: 70px 20px;
  color: var(--text-dim);
}

.empty-state b { display: block; font-size: 20px; color: var(--text-strong); margin-bottom: 8px; }

.pagination { display: flex; gap: 8px; justify-content: center; padding: 26px 0 10px; flex-wrap: wrap; }

.pagination button {
  min-width: 38px; height: 38px;
  padding: 0 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-dim);
  cursor: pointer;
  font-size: 14px;
  transition: .15s;
}

.pagination button:hover:not(:disabled) { color: var(--brand); border-color: var(--brand); }
.pagination button.active { background: var(--brand); border-color: var(--brand); color: #061018; font-weight: 700; }
.pagination button:disabled { opacity: .4; cursor: not-allowed; }

.to-top {
  position: fixed;
  right: 22px; bottom: 22px;
  width: 42px; height: 42px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-dim);
  cursor: pointer;
  display: none;
  place-items: center;
  box-shadow: var(--shadow);
  z-index: 70;
  font-size: 17px;
}

.to-top.show { display: grid; }
.to-top:hover { color: var(--brand); border-color: var(--brand); }

.page-head { padding: 44px 0 8px; }
.page-head h1 { margin: 0 0 10px; font-size: clamp(26px, 3.4vw, 36px); color: var(--text-strong); }
.page-head p { margin: 0; color: var(--text-dim); max-width: 720px; }

.note {
  border: 1px dashed var(--border);
  background: var(--bg-soft);
  border-radius: var(--radius);
  padding: 16px 18px;
  color: var(--text-dim);
  font-size: 14.5px;
}

.timeline { display: flex; flex-direction: column; gap: 0; }
.tl-item { display: grid; grid-template-columns: 130px 1fr; gap: 20px; padding: 18px 0; border-bottom: 1px dashed var(--border); }
.tl-item:last-child { border-bottom: none; }
.tl-item time { font-family: var(--mono); color: var(--brand); font-size: 13.5px; }
.tl-item b { color: var(--text-strong); display: block; }
.tl-item p { margin: 4px 0 0; font-size: 14.5px; color: var(--text-dim); }

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .article-layout { grid-template-columns: 1fr; }
  .side { position: static; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    position: absolute;
    top: 62px; left: 0; right: 0;
    flex-direction: column;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 10px;
    gap: 2px;
  }
  .search-box input { width: 130px; }
  .search-box input:focus { width: 150px; }
  .suggest { width: min(340px, 92vw); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .article { padding: 24px 20px 28px; }
  .post-row { grid-template-columns: 1fr; gap: 6px; }
  .pager { grid-template-columns: 1fr; }
  .tl-item { grid-template-columns: 1fr; gap: 4px; }
  .foot-grid { grid-template-columns: 1fr; }
}