:root {
  color-scheme: light;
  --bg: #f6f6f4;
  --panel: #ffffff;
  --text: #101010;
  --muted: #666666;
  --line: #141414;
  --line-soft: #cfcfc7;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.06);
  --radius: 0;
  --radius-sm: 0;
  --font-serif: "SimSun", "Songti SC", "STSong", "NSimSun", serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", "Menlo", monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(0, 0, 0, 0.04), transparent 28%),
    radial-gradient(circle at bottom right, rgba(0, 0, 0, 0.035), transparent 25%),
    linear-gradient(180deg, #fafaf8 0%, #f1f1ed 100%);
  font-family: var(--font-serif);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(0, 0, 0, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 0, 0, 0.03) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.8), transparent 86%);
  opacity: 0.35;
}

.page-frame {
  position: relative;
  z-index: 1;
  max-width: 1440px;
  margin: 0 auto;
  padding: 28px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 20px;
  margin-bottom: 24px;
  padding: 8px 4px 18px;
  border-bottom: 2px solid var(--line);
}

.eyebrow,
.section-label,
.article-kicker,
.topbar-meta,
.article-meta,
.count-badge,
.ghost-button,
.tag,
.post-card .date,
.intro-text,
.article-summary,
.source-code,
.markdown-body {
  font-family: var(--font-serif);
}

.eyebrow,
.section-label,
.article-kicker {
  margin: 0 0 8px;
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}

h1,
h2,
h3,
h4 {
  margin: 0;
  line-height: 0.98;
  font-weight: 700;
  letter-spacing: -0.04em;
  font-family: var(--font-serif);
}

h1 {
  font-size: clamp(2.8rem, 7vw, 5.8rem);
}

h2 {
  font-size: clamp(2rem, 4vw, 3.5rem);
}

.topbar-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
  color: var(--muted);
  font-size: 0.74rem;
}

.topbar-meta span,
.count-badge,
.tag,
.ghost-button {
  border: 1px solid var(--line);
  border-radius: 0;
  background: rgba(255, 255, 255, 0.76);
}

.topbar-meta span {
  padding: 0.55rem 0.8rem;
}

.layout {
  display: grid;
  grid-template-columns: 340px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.sidebar,
.content-shell {
  display: grid;
  gap: 20px;
}

.panel,
.reader {
  background: rgba(255, 255, 255, 0.86);
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.panel {
  padding: 20px;
}

.article-summary {
  margin: 0;
  color: #2d2d2d;
  font-size: 0.98rem;
  line-height: 1.8;
}

.panel-head,
.article-top {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 16px;
}

.count-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.45rem 0.75rem;
  font-size: 0.72rem;
  color: var(--muted);
}

.post-list {
  display: grid;
  gap: 12px;
}

.empty-state {
  padding: 18px;
  border: 1px dashed var(--line-soft);
  border-radius: 0;
  color: var(--muted);
  font-family: var(--font-serif);
  font-size: 0.78rem;
  line-height: 1.7;
}

.post-card {
  width: 100%;
  text-align: left;
  padding: 16px;
  border: 1px solid var(--line-soft);
  border-radius: 0;
  background: #fff;
  cursor: pointer;
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    box-shadow 180ms ease;
}

.post-card:hover {
  transform: translateY(-2px);
  border-color: var(--line);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
}

.post-card.is-active {
  border-color: var(--line);
  background: linear-gradient(180deg, #ffffff 0%, #f6f6f2 100%);
}

.post-card .meta-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 0.72rem;
}

.post-card h3 {
  font-size: 1.55rem;
  margin-bottom: 8px;
}

.post-card p {
  margin: 0;
  color: #3a3a3a;
  font-size: 0.92rem;
  line-height: 1.6;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-list-inline {
  margin-top: 14px;
}

.tag {
  padding: 0.42rem 0.72rem;
  font-size: 0.72rem;
  color: var(--text);
}

.tag.is-active {
  background: #101010;
  color: #fff;
}

.reader {
  padding: 28px;
  min-height: 100%;
}

.article-meta {
  display: flex;
  flex-direction: column;
  align-items: end;
  gap: 6px;
  color: var(--muted);
  font-size: 0.74rem;
}

.article-summary {
  margin-top: 16px;
  max-width: 72ch;
}

.divider {
  margin: 24px 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line), transparent);
}

.markdown-body {
  font-size: 1.03rem;
  line-height: 1.85;
  font-family: var(--font-serif);
}

.markdown-body > * + * {
  margin-top: 1rem;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  margin-top: 2.1rem;
  margin-bottom: 0.5rem;
  font-family: "Cormorant Garamond", "Iowan Old Style", serif;
}

.markdown-body p,
.markdown-body ul,
.markdown-body ol,
.markdown-body blockquote,
.markdown-body pre,
.markdown-body table {
  margin: 0;
}

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

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

.markdown-body a {
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.markdown-body a:hover {
  background: rgba(0, 0, 0, 0.05);
}

.markdown-body blockquote {
  padding: 0.95rem 1rem;
  border-left: 3px solid var(--line);
  background: rgba(0, 0, 0, 0.03);
  color: #222;
}

.markdown-body code {
  padding: 0.12rem 0.35rem;
  border: 1px solid rgba(0, 0, 0, 0.18);
  border-radius: 0;
  background: rgba(255, 255, 255, 0.78);
  font-family: var(--font-mono);
  font-size: 0.9em;
}

.markdown-body pre {
  overflow-x: auto;
  padding: 1rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: 0;
  background: #0f0f0f;
  color: #f5f5f5;
  font-family: var(--font-mono);
}

.markdown-body pre code {
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  font-family: inherit;
  font-size: 0.94rem;
}

.markdown-body hr {
  border: 0;
  border-top: 1px solid var(--line-soft);
  margin: 1.6rem 0;
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 0;
}

.markdown-body th,
.markdown-body td {
  padding: 0.78rem 0.85rem;
  border-bottom: 1px solid var(--line-soft);
  border-right: 1px solid var(--line-soft);
  text-align: left;
}

.markdown-body th {
  background: rgba(0, 0, 0, 0.05);
}

.fade-in {
  animation: rise-in 320ms ease both;
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1100px) {
  .layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .page-frame {
    padding: 16px;
  }

  .layout {
    display: grid;
    grid-template-columns: 1fr;
    grid-template-areas:
      "tags"
      "article"
      "posts";
  }

  .sidebar {
    display: contents;
  }

  .sidebar > .panel:first-child {
    grid-area: tags;
  }

  .sidebar > .panel:last-child {
    grid-area: posts;
  }

  .content-shell {
    grid-area: article;
  }

  .topbar,
  .panel-head,
  .article-top {
    flex-direction: column;
    align-items: start;
  }

  .topbar-meta,
  .article-meta {
    align-items: start;
  }

  .reader {
    padding: 20px;
  }

  h1 {
    font-size: clamp(2.4rem, 14vw, 4rem);
  }
}