:root {
  --c-bg: #ffffff;
  --c-fg: #0f172a;
  --c-muted: #475569;
  --c-brand: #0ea5e9;
  --c-bdr: #e2e8f0;
  --c-card: #f8fafc;
  --toc-width: 280px;
  --max-w: 1200px;
}
/*111 */
:root {
  --container: 1200px;
  --content: 780px;
  --brand: #0a66c2;
  --ink: #111;
  --muted: #666;
  --bg: #fff;
  --panel: #fafafa;
  --border: #eee;
  --radius: 12px;
}
body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, "Noto Sans SC",
    "PingFang SC", sans-serif;
  color: var(--ink);
  background: var(--bg);
  margin: 0;
  line-height: 1.75;
}

/* 顶部封面 */
header.hero {
  background: linear-gradient(180deg, var(--brand), #0a5ad1);
  color: #fff;
  padding: 40px 20px;
}

.hero-wrap {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  gap: 24px;
  align-items: center;
  flex-wrap: wrap;
}

.hero h1 {
  font-size: 32px;
  line-height: 1.15;
  margin: 0 0 8px;
}

.hero p {
  margin: 0;
  color: #e6f2ff;
}

.hero figure {
  margin: 0 0 0 auto;
}

.hero img {
  width: 560px;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  box-shadow: 0 8px 24px rgba(10, 102, 194, 0.12);
}

/*111 */
html {
  scroll-behavior: smooth
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Noto Sans", sans-serif;
  color: var(--c-fg);
  background: var(--c-bg);
}

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

a:hover {
  text-decoration: underline
}

header {
  border-bottom: 1px solid var(--c-bdr);
  background: #fff;
  position: sticky;
  top: 0;
  z-index: 40
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 16px
}

.breadcrumb {
  font-size: 14px;
  color: var(--c-muted)
}

main {
  display: grid;
  grid-template-columns: 1fr var(--toc-width);
  gap: 32px
}

article {
  padding-right: 8px
}

.post-title {
  font-size: 36px;
  line-height: 1.2;
  margin: 16px 0
}

.meta {
  color: var(--c-muted);
  font-size: 14px
}

.cover {
  margin: 24px 0;
  background: var(--c-card);
  border: 1px solid var(--c-bdr);
  border-radius: 16px;
  overflow: hidden
}

figure {
  margin: 0
}

figure img {
  display: block;
  width: 100%;
  height: auto
}

figure figcaption {
  padding: 8px 12px;
  font-size: 12px;
  color: var(--c-muted)
}

.toc-card {
  position: sticky;
  top: 90px;
  border: 1px solid var(--c-bdr);
  border-radius: 16px;
  background: var(--c-card);
  padding: 16px;
  max-height: 80vh;
  overflow: auto
}

.toc-card h3 {
  margin: 0 0 8px 0;
  font-size: 14px;
  color: var(--c-muted)
}

.toc {
  list-style: none;
  padding-left: 0;
  margin: 0
}

.toc li {
  margin: 6px 0
}

.toc a {
  display: block;
  font-size: 14px;
  line-height: 1.4
}

.toc a.active {
  font-weight: 600
}

.content h2 {
  margin-top: 36px;
  padding-top: 12px;
  border-top: 1px dashed var(--c-bdr)
}

.content h3 {
  margin-top: 24px
}

blockquote {
  margin: 16px 0;
  padding: 12px 16px;
  border-left: 4px solid var(--c-brand);
  background: #f0f9ff;
  border-radius: 8px
}

.table-wrap {
  overflow: auto;
  border: 1px solid var(--c-bdr);
  border-radius: 12px
}

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 14px
}

th,
td {
  border-bottom: 1px solid var(--c-bdr);
  padding: 10px 12px;
  text-align: left
}

th {
  background: #f1f5f9
}

.cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: linear-gradient(180deg, #e0f2fe, #f0f9ff);
  border: 1px solid var(--c-bdr);
  border-radius: 16px;
  padding: 20px;
  margin: 24px 0
}

.btn {
  display: inline-block;
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid var(--c-brand);
  background: var(--c-brand);
  color: #fff;
  font-weight: 600
}

.grid {
  display: grid;
  gap: 16px
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr)
}

.related-card {
  border: 1px solid var(--c-bdr);
  border-radius: 16px;
  padding: 16px;
  background: #fff
}

footer {
  margin-top: 40px;
  padding: 24px 0;
  border-top: 1px solid var(--c-bdr);
  color: var(--c-muted)
}

.internal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 12px 0
}

.tag {
  font-size: 12px;
  border: 1px solid var(--c-bdr);
  border-radius: 999px;
  padding: 6px 10px;
  background: #fff
}

@media (max-width: 1024px) {
  main {
    grid-template-columns: 1fr
  }

  .toc-card {
    position: relative;
    top: auto
  }
}
strong {
  color: red;
}
.w-100 {
  width: 100%;
}