:root {
  --paper: #fefdf8;
  --ink: #161512;
  --ink-soft: #3d3932;
  --muted: #7a7469;
  --faint: #b4ada0;
  --line: rgba(22, 21, 18, 0.16);
  --line-soft: rgba(22, 21, 18, 0.08);
  --accent: #1f5f6f;
  --accent-wash: rgba(31, 95, 111, 0.055);
  --max: 1120px;
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", STSong, SimSun, Georgia, "Times New Roman", serif;
  --mono: "SF Mono", "Cascadia Code", "JetBrains Mono", Menlo, Consolas, monospace;
  --ease: cubic-bezier(.22, 1, .36, 1);
  --topbar-bg: rgba(254, 253, 248, .88);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #141310;
    --ink: #e8e4d9;
    --ink-soft: #c4bfae;
    --muted: #8a8477;
    --faint: #5e594e;
    --line: rgba(232, 228, 217, 0.14);
    --line-soft: rgba(232, 228, 217, 0.07);
    --accent: #5cb8c9;
    --accent-wash: rgba(92, 184, 201, 0.08);
    --topbar-bg: rgba(20, 19, 16, .92);
  }
  body::before {
    background:
      radial-gradient(circle at 78% 8%, rgba(92,184,201,.035), transparent 28%),
      linear-gradient(90deg, rgba(232,228,217,.012) 1px, transparent 1px) !important;
    background-size: auto, 84px 84px !important;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--serif);
  line-height: 1.78;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 78% 8%, rgba(31,95,111,.045), transparent 28%),
    linear-gradient(90deg, rgba(22,21,18,.014) 1px, transparent 1px);
  background-size: auto, 84px 84px;
  opacity: .7;
}
a { color: inherit; text-decoration: none; }
::selection { background: var(--accent-wash); color: var(--accent); }

.page {
  width: min(var(--max), calc(100% - 48px));
  margin: 0 auto;
  position: relative;
}

/* ===== TOPBAR ===== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 58px;
  background: var(--topbar-bg);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid transparent;
  transition: border-color .35s ease;
}
.topbar.scrolled { border-bottom-color: var(--line-soft); }
.brand {
  font-size: 22px;
  line-height: 1;
  font-weight: 500;
  letter-spacing: -.02em;
}
.nav {
  display: flex;
  gap: 24px;
  align-items: center;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--muted);
}
.nav a { transition: color .25s ease; }
.nav a:hover { color: var(--ink); }
.nav-home {
  color: var(--accent) !important;
  border-bottom: 1px solid var(--accent);
  padding-bottom: 2px;
}

.mono, .issue-line, .section-kicker, .mono-label, .post-tags .tag,
.post-nav .mono-label, .meta-link, .pagination, .footer-note, .back-top {
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: .11em;
}

/* ===== BLOG HERO ===== */
.blog-hero {
  padding: 54px 0 42px;
  border-bottom: 1px solid var(--line);
}
.blog-hero-inner { max-width: 720px; }
.issue-line {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  color: var(--accent);
  font-size: 12px;
  margin-bottom: 22px;
}
.issue-line span:not(:last-child)::after {
  content: "/";
  margin-left: 16px;
  color: var(--faint);
}
.blog-title {
  margin: 0;
  font-size: clamp(46px, 5.7vw, 78px);
  line-height: .99;
  font-weight: 500;
  letter-spacing: -.052em;
}
.blog-subtitle {
  margin: 18px 0 0;
  color: var(--ink-soft);
  font-size: clamp(20px, 2vw, 26px);
  line-height: 1.45;
  font-weight: 500;
  letter-spacing: -.035em;
}

/* ===== SECTION ===== */
.section {
  padding: 82px 0;
  border-bottom: 1px solid var(--line);
}
.section-shell {
  display: grid;
  grid-template-columns: minmax(220px, 0.72fr) minmax(0, 1fr);
  gap: clamp(42px, 8vw, 104px);
  align-items: start;
}
.section-kicker {
  color: var(--accent);
  font-size: 11px;
  margin-bottom: 20px;
}
h1, h2 {
  margin: 0;
  max-width: 430px;
  font-size: clamp(30px, 4.2vw, 56px);
  font-weight: 500;
  letter-spacing: -.048em;
  line-height: 1.04;
}
h1.post-title, h1.blog-title {
  max-width: none;
}

/* ===== POST CARD ===== */
.post-card {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 28px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line-soft);
  transition: padding-left .3s ease;
}
.post-card:first-child { border-top: 1px solid var(--line); }
.post-card:hover { padding-left: 12px; }
.post-date {
  color: var(--faint);
  font-size: 12px;
  padding-top: 4px;
}
.post-card-title {
  margin: 0 0 10px;
  font-size: clamp(22px, 2.4vw, 28px);
  font-weight: 500;
  letter-spacing: -.032em;
  line-height: 1.2;
}
.post-card-title a {
  border-bottom: 1px solid transparent;
  transition: border-color .25s ease;
}
.post-card:hover .post-card-title a { border-bottom-color: var(--accent); }
.post-card-excerpt {
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.9;
}
.post-card-excerpt p { margin: 0; }
.post-tags {
  margin-top: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.post-tags .tag {
  font-size: 11px;
  color: var(--muted);
  border-bottom: 1px solid var(--line-soft);
  padding-bottom: 2px;
  transition: color .25s ease, border-color .25s ease;
}
.post-tags .tag:hover { color: var(--accent); border-color: var(--accent); }

/* ===== POST DETAIL ===== */
.post-section { padding-top: 54px; }
.post-title {
  font-size: clamp(36px, 4.8vw, 64px) !important;
  max-width: none !important;
}
.post-meta {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
.meta-link {
  font-size: 11px;
  color: var(--muted);
  transition: color .25s ease;
}
.meta-link:hover { color: var(--accent); }
.meta-sep { color: var(--faint); font-size: 11px; }

.post-content {
  color: var(--ink-soft);
  font-size: 17px;
  line-height: 2;
}
.post-content h2 {
  font-size: clamp(24px, 2.8vw, 32px) !important;
  max-width: none !important;
  margin: 48px 0 20px;
  color: var(--ink);
  letter-spacing: -.03em;
}
.post-content h3 {
  font-size: clamp(20px, 2.2vw, 24px);
  margin: 36px 0 16px;
  color: var(--ink);
  font-weight: 500;
  letter-spacing: -.025em;
}
.post-content p { margin: 0 0 20px; }
.post-content ul, .post-content ol {
  padding-left: 24px;
  margin: 0 0 20px;
}
.post-content li { margin-bottom: 8px; }
.post-content blockquote {
  margin: 28px 0;
  padding: 16px 24px;
  border-left: 3px solid var(--accent);
  background: var(--accent-wash);
  color: var(--ink-soft);
  font-style: italic;
}
.post-content code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--line-soft);
  padding: 2px 6px;
  border-radius: 3px;
}
.post-content pre {
  margin: 24px 0;
  padding: 20px 24px;
  background: var(--line-soft);
  border-radius: 6px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.7;
}
.post-content pre code {
  background: none;
  padding: 0;
}
.post-content img {
  max-width: 100%;
  border-radius: 6px;
  margin: 24px 0;
}
.post-content a {
  color: var(--accent);
  border-bottom: 1px solid var(--accent-wash);
  transition: border-color .25s ease;
}
.post-content a:hover { border-bottom-color: var(--accent); }
.post-content hr {
  border: none;
  border-top: 1px solid var(--line-soft);
  margin: 40px 0;
}

/* ===== POST NAV ===== */
.post-nav {
  margin-top: 60px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}
.post-nav-link {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.post-nav-link.next { text-align: right; align-items: flex-end; }
.post-nav .mono-label {
  font-size: 11px;
  color: var(--muted);
}
.post-nav .nav-title {
  font-size: 18px;
  color: var(--ink-soft);
  font-weight: 500;
  letter-spacing: -.02em;
}

/* ===== ARCHIVE ===== */
.archive-year {
  margin: 0 0 16px;
  font-size: 24px;
  font-weight: 500;
  letter-spacing: -.02em;
  color: var(--ink);
}
.archive-list {
  border-top: 1px solid var(--line);
}
.archive-item {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 20px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
  transition: padding-left .3s ease;
}
.archive-item:hover { padding-left: 8px; }
.archive-date {
  color: var(--faint);
  font-size: 12px;
  padding-top: 3px;
}
.archive-title {
  color: var(--ink-soft);
  font-size: 17px;
  font-weight: 500;
  letter-spacing: -.02em;
}

/* ===== PAGINATION ===== */
.pagination {
  margin-top: 40px;
  display: flex;
  gap: 24px;
  font-size: 12px;
  color: var(--muted);
}
.pagination a, .pagination span {
  border-bottom: 1px solid var(--line-soft);
  padding-bottom: 4px;
  transition: color .25s ease, border-color .25s ease;
}
.pagination a:hover { color: var(--accent); border-color: var(--accent); }
.pagination .current { color: var(--ink); border-color: var(--ink); }

/* ===== FOOTER ===== */
footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 34px 0 48px;
  color: var(--muted);
  font-size: 13px;
}
.footer-note { font-size: 11px; color: var(--faint); }
.back-top {
  font-size: 11px;
  color: var(--faint);
  border-bottom: 1px solid var(--line-soft);
  padding-bottom: 3px;
  transition: color .25s ease, border-color .25s ease;
}
.back-top:hover { color: var(--accent); border-color: var(--accent); }

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .page { width: min(100% - 34px, var(--max)); }
  .nav { gap: 14px; font-size: 10px; }
  .section { padding: 78px 0; }
  .section-shell { grid-template-columns: 1fr; gap: 28px; }
  h1, h2 { max-width: 720px; }
  .post-card { grid-template-columns: 1fr; gap: 6px; }
  .post-nav { grid-template-columns: 1fr; gap: 24px; }
  footer { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 560px) {
  .nav { gap: 10px; font-size: 9px; letter-spacing: .06em; }
  .blog-title { font-size: clamp(42px, 14vw, 64px); }
  .archive-item { grid-template-columns: 1fr; gap: 4px; }
}