:root {
  --bg: #f5f1e7;
  --panel: #fffdf8;
  --text: #1d1a16;
  --muted: #6d6458;
  --line: rgba(29, 26, 22, 0.12);
  --accent: #335c67;
  --accent-soft: rgba(51, 92, 103, 0.1);
  --card-shadow: 0 18px 40px rgba(29, 26, 22, 0.08);
  --content: 860px;
  --radius: 18px;
  --font-body: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, "Noto Serif SC", serif;
  --font-ui: "Avenir Next", "Segoe UI", "PingFang SC", "Noto Sans SC", sans-serif;
}

[data-theme="night"] {
  --bg: #121417;
  --panel: #1a1f25;
  --text: #edf0eb;
  --muted: #a7b0b7;
  --line: rgba(237, 240, 235, 0.12);
  --accent: #8ecae6;
  --accent-soft: rgba(142, 202, 230, 0.12);
  --card-shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(51, 92, 103, 0.08), transparent 28%),
    linear-gradient(180deg, rgba(255,255,255,0.35), transparent 30%),
    var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.72;
  min-height: 100vh;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }
.shell {
  width: min(calc(100% - 32px), 1100px);
  margin: 0 auto;
  padding: 28px 0 60px;
}
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 0 26px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 28px;
}
.brand {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.brand-name {
  font: 700 1.25rem/1.1 var(--font-ui);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.brand-note {
  color: var(--muted);
  font: 500 0.95rem/1.4 var(--font-ui);
}
.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: flex-end;
  font: 600 0.95rem/1.4 var(--font-ui);
}
.nav a { color: var(--text); opacity: 0.86; }
.nav a.current { color: var(--accent); opacity: 1; }
.theme-toggle {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  border-radius: 999px;
  padding: 8px 14px;
  cursor: pointer;
  font: 600 0.9rem/1 var(--font-ui);
}
.hero, .page-header, .content-card, .post-card, .tag-card, .note-card, .empty-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
}
.hero {
  padding: 34px;
  margin-bottom: 28px;
}
.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font: 700 0.86rem/1.2 var(--font-ui);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
h1, h2, h3 {
  margin: 0 0 12px;
  line-height: 1.18;
  font-weight: 700;
}
h1 { font-size: clamp(2rem, 5vw, 3.4rem); }
h2 { font-size: clamp(1.3rem, 3vw, 2rem); }
h3 { font-size: 1.08rem; font-family: var(--font-ui); }
.lead { color: var(--muted); font-size: 1.06rem; margin: 0; max-width: 62ch; }
.grid-two {
  display: grid;
  grid-template-columns: minmax(0, 1.9fr) minmax(260px, 1fr);
  gap: 24px;
  align-items: start;
}
.content-card, .post-card, .tag-card, .note-card, .empty-card {
  padding: 24px;
}
.meta {
  color: var(--muted);
  font: 500 0.92rem/1.5 var(--font-ui);
}
.stack { display: grid; gap: 18px; }
.post-list { display: grid; gap: 18px; }
.post-card h2, .post-card h3 { margin-bottom: 10px; }
.post-card p { margin: 0; }
.post-grid-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  margin-bottom: 10px;
  color: var(--muted);
  font: 500 0.9rem/1.4 var(--font-ui);
}
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}
.tag {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 6px 11px;
  background: var(--accent-soft);
  color: var(--accent);
  font: 600 0.86rem/1 var(--font-ui);
}
.article {
  padding: 30px 34px;
}
.article .prose > *:first-child { margin-top: 0; }
.prose p, .prose ul, .prose ol, .prose pre {
  margin: 1rem 0;
}
.prose ul, .prose ol { padding-left: 1.3rem; }
pre {
  overflow-x: auto;
  background: #1f2329;
  color: #f1f4f8;
  padding: 16px 18px;
  border-radius: 14px;
  font-size: 0.92rem;
  line-height: 1.5;
}
[data-theme="night"] pre {
  background: #0f1318;
  color: #edf2f7;
}
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 20px;
}
.filter-bar button {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  border-radius: 999px;
  padding: 8px 14px;
  cursor: pointer;
  font: 600 0.88rem/1 var(--font-ui);
}
.filter-bar button.active {
  background: var(--accent);
  color: #fff;
  border-color: transparent;
}
.muted { color: var(--muted); }
.list-plain {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
}
.list-plain li {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: baseline;
  border-bottom: 1px dashed var(--line);
  padding-bottom: 10px;
}
.site-footer {
  margin-top: 34px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
  justify-content: space-between;
  font: 500 0.92rem/1.5 var(--font-ui);
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}
.site-footer a { color: inherit; }
.page-header {
  padding: 30px 34px;
  margin-bottom: 22px;
}
.article-index-note {
  margin: 0 0 18px;
  color: var(--muted);
  font: 500 0.94rem/1.5 var(--font-ui);
}
.hero-note {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 18px;
  font: 600 0.88rem/1.4 var(--font-ui);
  color: var(--muted);
}
.hero-note::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: #6a994e;
}
.hidden { display: none !important; }
@media (max-width: 880px) {
  .grid-two { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .shell { width: min(calc(100% - 20px), 1100px); padding-top: 16px; }
  .site-header { flex-direction: column; align-items: flex-start; }
  .hero, .page-header, .content-card, .post-card, .tag-card, .note-card, .empty-card, .article {
    padding: 22px 20px;
  }
  .list-plain li { flex-direction: column; align-items: flex-start; }
}