:root {
  --bg: #f8f7f4;
  --surface: #ffffff;
  --text: #1f2937;
  --muted: #667085;
  --line: #e5e7eb;
  --accent: #0f766e;
  --accent-soft: #ecfdf5;
  --code-bg: #f3f4f6;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: linear-gradient(180deg, #fafaf9 0%, #f8f7f4 100%);
  color: var(--text);
  font: 16px/1.75 "Noto Serif SC", "Source Han Serif SC", Georgia, serif;
}

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

a:hover {
  text-decoration: underline;
}

.container {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
}

.page-single .container {
  width: min(1360px, calc(100% - 40px));
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(10px);
  background: rgba(248, 247, 244, 0.88);
  border-bottom: 1px solid rgba(229, 231, 235, 0.9);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 68px;
}

.brand {
  color: var(--text);
  font-size: 1.15rem;
  font-weight: 700;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.site-nav a {
  color: var(--muted);
  font-size: 0.98rem;
}

main {
  padding: 48px 0 72px;
}

.hero,
.page-intro,
.card,
.post,
.pagination {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.hero,
.page-intro,
.post {
  padding: 34px;
}

.hero {
  margin-bottom: 24px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
h4 {
  margin: 0 0 14px;
  line-height: 1.3;
}

h1 {
  font-size: clamp(2.35rem, 4.8vw, 4.2rem);
}

h2 {
  font-size: 1.5rem;
}

p {
  margin: 0 0 1rem;
}

.lead {
  color: var(--muted);
  font-size: 1.12rem;
}

.meta {
  color: var(--muted);
  font-size: 0.92rem;
}

.post-list {
  display: grid;
  gap: 18px;
}

.post-layout {
  display: block;
}

.post-layout.has-toc {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 310px;
  gap: 28px;
  align-items: start;
}

.post-main {
  min-width: 0;
}

.post.post-main {
  padding: 0;
  overflow: hidden;
}

.post.post-main > .page-intro {
  margin: 0;
  padding: 42px 44px 28px;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  box-shadow: none;
  background:
    radial-gradient(circle at top left, rgba(15, 118, 110, 0.05), transparent 34%),
    linear-gradient(180deg, rgba(248, 247, 244, 0.88), rgba(255, 255, 255, 0.98));
}

.post.post-main > .page-intro > * {
  max-width: 920px;
  margin-left: auto;
  margin-right: auto;
}

.post-toc {
  position: sticky;
  top: 92px;
}

.toc-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 20px 20px 18px;
}

.toc-title {
  margin: 0 0 12px;
  color: var(--text);
  font-size: 0.98rem;
  font-weight: 700;
}

.toc-nav {
  max-height: calc(100vh - 120px);
  overflow: auto;
  padding-right: 6px;
}

.toc-nav #TableOfContents > ul,
.toc-nav #TableOfContents > ol,
.toc-nav ul,
.toc-nav ol {
  margin: 0;
  padding-left: 0;
  list-style: none;
}

.toc-nav li {
  margin: 0.3rem 0;
}

.toc-nav li ul,
.toc-nav li ol {
  margin-top: 0.4rem;
  margin-left: 0.8rem;
  padding-left: 0.9rem;
  border-left: 1px solid rgba(15, 118, 110, 0.12);
}

.toc-nav a {
  display: block;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.5;
  transition: color 0.2s ease, background-color 0.2s ease;
  padding: 0.18rem 0.45rem;
  border-radius: 8px;
}

.toc-nav a:hover,
.toc-nav a.is-active {
  color: var(--accent);
  text-decoration: none;
  background: rgba(15, 118, 110, 0.08);
}

.content :is(h2, h3, h4, h5, h6) {
  scroll-margin-top: 92px;
}

.content {
  font-size: 1.08rem;
  padding: 36px 44px 46px;
}

.post.post-main > .content > * {
  max-width: 920px;
  margin-left: auto;
  margin-right: auto;
}

.post.post-main > .content > ul,
.post.post-main > .content > ol,
.post.post-main > .content > blockquote,
.post.post-main > .content > pre,
.post.post-main > .content > .highlight,
.post.post-main > .content > table {
  max-width: 920px;
}

.content p,
.content li,
.content blockquote {
  max-width: none;
}

.content h2 {
  margin-top: 2.6rem;
  font-size: 2rem;
}

.content h3 {
  margin-top: 2rem;
  font-size: 1.45rem;
}

.content h4 {
  margin-top: 1.6rem;
  font-size: 1.18rem;
}

.card {
  padding: 22px;
}

.card h2 {
  margin-bottom: 8px;
}

.content ul,
.content ol {
  padding-left: 1.4rem;
}

.content li + li {
  margin-top: 0.4rem;
}

.content blockquote {
  margin: 1.5rem 0;
  padding: 0.9rem 1rem;
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
  color: #134e4a;
}

.content pre,
.content code {
  font-family: "JetBrains Mono", "Cascadia Code", Consolas, monospace;
}

.content code {
  padding: 0.15rem 0.35rem;
  border-radius: 6px;
  background: var(--code-bg);
  font-size: 0.92em;
}

.content pre {
  overflow-x: auto;
  padding: 1rem;
  border-radius: 14px;
  background: #f6f8fa;
}

.content pre code {
  padding: 0;
  background: transparent;
}

.highlight {
  margin: 1.25rem 0;
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
}

.highlight pre {
  margin: 0;
}

.pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 24px;
  padding: 16px 20px;
}

.pager-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 88px;
}

.pager-link.disabled {
  color: #98a2b3;
}

.pager-current {
  color: var(--muted);
  font-size: 0.95rem;
}

.site-footer {
  padding: 0 0 28px;
}

.site-footer p {
  margin: 0;
  color: var(--muted);
  text-align: center;
  font-size: 0.92rem;
}

@media (max-width: 640px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    padding: 12px 0;
  }

  .hero,
  .page-intro,
  .post,
  .card {
    padding: 20px;
  }

  main {
    padding: 28px 0 44px;
  }

  .container,
  .page-single .container {
    width: min(100%, calc(100% - 24px));
  }

  h1 {
    font-size: clamp(2rem, 10vw, 2.8rem);
  }

  .post.post-main > .page-intro,
  .content {
    padding: 24px 20px 28px;
  }

  .pagination {
    flex-direction: column;
  }
}

@media (max-width: 980px) {
  .post-layout.has-toc {
    grid-template-columns: 1fr;
  }

  .post-toc {
    position: static;
    order: -1;
  }

  .toc-nav {
    max-height: none;
  }
}