html {
  box-sizing: border-box;
}

*,
*::before,
*::after {
  box-sizing: inherit;
}

:root {
  --page-bg: #f5f6f8;
  --surface: #ffffff;
  --surface-soft: #f8fafc;
  --ink: #151922;
  --ink-soft: #384252;
  --muted: #6b7280;
  --line: #d8dee8;
  --line-strong: #b8c0cc;
  --accent: #1d4ed8;
  --accent-strong: #173b8f;
  --accent-soft: #e8eefc;
  --signal: #a16207;
  --shadow: 0 14px 34px rgba(18, 24, 38, 0.08);
}

body.index {
  margin: 0;
  padding-top: 0;
  background: var(--page-bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", sans-serif;
}

.post-page {
  padding: 0 0 80px;
}

.post-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  width: 100%;
  min-height: 64px;
  padding: 0 34px;
  background: #111827;
  border-bottom: 1px solid #263244;
  box-shadow: 0 10px 24px rgba(17, 24, 39, 0.18);
  backdrop-filter: blur(14px);
}

.post-brand {
  color: #f8fafc;
  font-size: 18px;
  font-weight: 800;
  text-decoration: none;
}

.post-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.post-tabs a {
  color: #cbd5e1;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 8px 13px;
  font-weight: 650;
  text-decoration: none;
  transition: color 160ms ease, border-color 160ms ease, background 160ms ease;
}

.post-tabs a:hover {
  color: #ffffff;
  background: rgba(59, 130, 246, 0.18);
  border-color: rgba(147, 197, 253, 0.35);
}

.post-frame {
  width: min(1188px, calc(100% - 36px));
  margin: 28px auto 0;
}

.post-shell {
  display: grid;
  grid-template-columns: minmax(0, 920px) 220px;
  gap: 24px;
  align-items: start;
  min-width: 0;
}

.post-hero,
.post-content {
  grid-column: 1;
}

.post-hero,
.post-content,
.post-cover {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.post-hero {
  padding: 30px 36px;
  background: linear-gradient(180deg, #ffffff 0%, #fbfcff 100%);
}

.post-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 20px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

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

.post-breadcrumb a:hover {
  text-decoration: underline;
}

.post-meta-line {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.post-meta-line span:first-child {
  color: var(--accent);
}

.post-hero h1 {
  margin: 0;
  padding-left: 0;
  color: var(--ink);
  font-size: clamp(32px, 5vw, 52px);
  line-height: 1.12;
  text-align: left;
  text-indent: 0;
}

.post-description {
  max-width: 760px;
  margin: 18px 0 0;
  color: var(--ink-soft);
  font-size: 17px;
  line-height: 1.85;
}

.post-author {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 24px;
}

.post-author img {
  width: 44px;
  height: 44px;
  border-radius: 999px;
  object-fit: cover;
}

.post-author strong,
.post-author span {
  display: block;
}

.post-author strong {
  color: var(--ink);
}

.post-author span {
  color: var(--muted);
  font-size: 13px;
}

.post-cover {
  overflow: hidden;
  margin: 24px 0;
}

.post-cover img {
  display: block;
  width: 100%;
  max-height: 420px;
  object-fit: cover;
}

.post-content {
  margin-top: 34px;
  padding: 42px 48px 56px;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.9;
}

.post-outline {
  position: sticky;
  top: 88px;
  grid-column: 2;
  grid-row: 1 / span 2;
}

.post-outline-inner {
  padding: 18px 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 10px 24px rgba(18, 24, 38, 0.06);
}

.post-outline-inner p {
  margin: 0 0 12px;
  color: var(--ink);
  font-size: 15px;
  font-weight: 800;
}

#post-outline-list {
  display: grid;
  gap: 8px;
}

#post-outline-list a {
  display: block;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
  text-decoration: none;
  overflow-wrap: anywhere;
}

#post-outline-list a:hover {
  color: var(--accent);
}

#post-outline-list .outline-h1 {
  color: var(--ink-soft);
  font-weight: 750;
}

#post-outline-list .outline-h2 {
  padding-left: 10px;
}

#post-outline-list .outline-h3 {
  padding-left: 20px;
  color: var(--muted);
}

.post-content > *:first-child {
  margin-top: 0;
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4 {
  padding-left: 0;
  color: var(--ink);
  text-align: left;
  text-indent: 0;
  line-height: 1.35;
}

.post-content h1 {
  margin: 34px 0 18px;
  font-size: 30px;
}

.post-content h2 {
  margin: 32px 0 16px;
  font-size: 25px;
}

.post-content h3 {
  margin: 28px 0 14px;
  font-size: 21px;
}

.post-content h4 {
  margin: 24px 0 12px;
  font-size: 18px;
}

.post-content p,
.post-content ul,
.post-content ol,
.post-content table,
.post-content blockquote,
.post-content pre {
  margin-bottom: 18px;
}

.post-content a {
  color: var(--accent);
}

.post-content img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 22px auto;
  border-radius: 8px;
  border: 1px solid var(--line);
}

.post-content blockquote {
  margin-left: 0;
  padding: 14px 18px;
  color: var(--ink-soft);
  background: var(--surface-soft);
  border-left: 4px solid var(--accent);
  border-radius: 0 8px 8px 0;
}

.post-content code {
  color: var(--accent-strong);
  background: var(--accent-soft);
  border-radius: 4px;
  padding: 2px 5px;
}

.post-content pre,
.post-content .highlight pre {
  overflow-x: auto;
  padding: 18px;
  color: #dbeafe;
  background: #111827;
  border: 1px solid #273244;
  border-radius: 8px;
  line-height: 1.65;
  white-space: pre;
}

.post-content pre code,
.post-content .highlight pre code {
  color: inherit;
  background: transparent;
  padding: 0;
}

.post-content table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
}

.post-content th,
.post-content td {
  padding: 10px 12px;
  border: 1px solid var(--line);
  vertical-align: top;
}

.post-content th {
  color: var(--ink);
  background: var(--surface-soft);
}

.post-content .anchor {
  display: none;
}

@media (max-width: 760px) {
  .post-page {
    padding: 0 0 54px;
  }

  .post-nav {
    position: static;
    align-items: flex-start;
    flex-direction: column;
    padding: 14px 16px;
  }

  .post-frame {
    width: min(100% - 24px, 920px);
    margin-top: 16px;
  }

  .post-shell {
    display: flex;
    flex-direction: column;
  }

  .post-outline {
    position: static;
    order: 2;
    width: 100%;
  }

  .post-content {
    order: 1;
  }

  .post-outline + .post-content {
    order: 3;
  }

  .post-outline-inner {
    box-shadow: 0 10px 24px rgba(22, 32, 42, 0.06);
  }

  .post-hero {
    padding: 24px 22px;
  }

  .post-content {
    padding: 28px 20px 38px;
  }
}