/* second_brain_reader — reading product */
:root {
  --bg: #f7f5f0;
  --fg: #1c1917;
  --muted: #78716c;
  --border: #e7e5e4;
  --link: #0f766e;
  --link-hover: #115e59;
  --card: #fffcf7;
  --accent: #44403c;
  --callout-bg: #ecfdf5;
  --callout-border: #5eead4;
  --callout-label: #0f766e;
  --toc-bg: rgba(255, 252, 247, 0.92);
  --max: 44rem;
  --font: "Iowan Old Style", "Palatino Linotype", Palatino, "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", Georgia, serif;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1917;
    --fg: #e7e5e4;
    --muted: #a8a29e;
    --border: #292524;
    --link: #5eead4;
    --link-hover: #99f6e4;
    --card: #231f1c;
    --accent: #d6d3d1;
    --callout-bg: #134e4a;
    --callout-border: #2dd4bf;
    --callout-label: #5eead4;
    --toc-bg: rgba(35, 31, 28, 0.94);
  }
}
* { box-sizing: border-box; }
html { font-size: 18px; -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  line-height: 1.75;
}
a { color: var(--link); text-decoration-thickness: 1px; text-underline-offset: 0.15em; }
a:hover { color: var(--link-hover); }
.wrap { max-width: var(--max); margin: 0 auto; padding: 1.5rem 1.35rem 4rem; }
.layout-with-toc { display: block; }
header.site {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 1rem; margin-bottom: 2rem; padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border); font-family: var(--sans);
}
header.site .brand { font-weight: 600; color: var(--accent); text-decoration: none; letter-spacing: 0.02em; }
header.site .meta { font-size: 0.8rem; color: var(--muted); }
.hero { margin-bottom: 1.75rem; }
.hero .date {
  font-family: var(--sans); font-variant-numeric: tabular-nums;
  font-size: 0.85rem; color: var(--muted); letter-spacing: 0.02em;
}
.hero h1 { font-size: 1.65rem; line-height: 1.28; font-weight: 650; margin: 0.35rem 0 0.6rem; letter-spacing: -0.015em; }
.hero .dek { color: var(--muted); font-size: 1.02rem; margin: 0; }
h1 { font-size: 1.55rem; line-height: 1.3; font-weight: 650; margin: 0 0 0.75rem; letter-spacing: -0.01em; }
.prose h2 {
  font-size: 1.22rem; margin: 2.35rem 0 0.7rem; padding-top: 0.85rem;
  border-top: 1px solid var(--border); font-weight: 650; letter-spacing: -0.01em;
  scroll-margin-top: 1.25rem;
}
.prose h2:first-child { border-top: none; padding-top: 0; margin-top: 0; }
.prose h3 { font-size: 1.05rem; margin: 1.6rem 0 0.5rem; scroll-margin-top: 1.25rem; }
.prose p, .prose li { font-size: 1.02rem; }
.prose ul, .prose ol { padding-left: 1.35rem; margin: 0.6rem 0 1rem; }
.prose li { margin: 0.35rem 0; }
.prose li > p { margin: 0.25rem 0; }
code, pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85em;
}
code { background: var(--border); padding: 0.1em 0.35em; border-radius: 4px; }
pre {
  background: var(--card); border: 1px solid var(--border);
  padding: 0.95rem 1.05rem; overflow-x: auto; border-radius: 8px;
  margin: 1rem 0 1.25rem; line-height: 1.55;
}
pre code { background: none; padding: 0; }
blockquote {
  margin: 1rem 0; padding: 0.25rem 0 0.25rem 1rem;
  border-left: 3px solid var(--border); color: var(--muted);
}
hr { border: none; border-top: 1px solid var(--border); margin: 2rem 0; }
.prose img { max-width: 100%; height: auto; }
.prose table { border-collapse: collapse; width: 100%; font-size: 0.9rem; margin: 1rem 0; }
.prose th, .prose td { border: 1px solid var(--border); padding: 0.4rem 0.6rem; }

/* 对实践 callout */
.callout-practice {
  margin: 1.15rem 0 1.5rem;
  padding: 0.85rem 1.05rem 0.95rem;
  background: var(--callout-bg);
  border-left: 4px solid var(--callout-border);
  border-radius: 0 10px 10px 0;
}
.callout-practice .label {
  display: block; font-family: var(--sans); font-size: 0.72rem;
  font-weight: 650; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--callout-label); margin-bottom: 0.35rem;
}
.callout-practice p { margin: 0; }

/* Mermaid */
.mermaid {
  margin: 1.25rem 0 1.6rem; padding: 1rem;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 10px; overflow-x: auto; text-align: center;
}

/* TOC */
.toc {
  font-family: var(--sans); font-size: 0.82rem;
  margin: 0 0 1.75rem; padding: 0.85rem 1rem;
  background: var(--card); border: 1px solid var(--border); border-radius: 10px;
}
.toc strong {
  display: block; font-size: 0.72rem; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--muted); margin-bottom: 0.45rem; font-weight: 650;
}
.toc ol { margin: 0; padding-left: 1.15rem; }
.toc li { margin: 0.28rem 0; line-height: 1.4; }
.toc a { color: var(--fg); text-decoration: none; }
.toc a:hover { color: var(--link); }
@media (min-width: 1100px) {
  .layout-with-toc.has-toc {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 11.5rem;
    gap: 1.75rem;
    align-items: start;
  }
  .layout-with-toc.has-toc .toc {
    position: sticky; top: 1.25rem; margin: 0;
    order: 2; font-size: 0.78rem; padding: 0.75rem 0.8rem;
    background: var(--toc-bg); backdrop-filter: blur(6px);
  }
  .layout-with-toc.has-toc .main-col { order: 1; min-width: 0; }
}

/* Dig log collapsed */
.dig-log {
  margin-top: 2.75rem; font-family: var(--sans);
  border: 1px solid var(--border); border-radius: 10px; background: var(--card);
}
.dig-log > summary {
  cursor: pointer; padding: 0.75rem 1rem; font-size: 0.88rem;
  color: var(--muted); list-style: none; user-select: none;
}
.dig-log > summary::-webkit-details-marker { display: none; }
.dig-log > summary::before { content: "▸ "; color: var(--muted); }
.dig-log[open] > summary::before { content: "▾ "; }
.dig-log > summary:hover { color: var(--fg); }
.dig-log .dig-body {
  padding: 0 1rem 1rem; border-top: 1px solid var(--border);
  font-family: var(--font); font-size: 0.92rem; color: var(--muted);
}
.dig-log .dig-body h1, .dig-log .dig-body h2 { font-size: 1.05rem; color: var(--fg); border: none; padding: 0; margin-top: 1rem; }

/* Index magazine cards */
.mag { list-style: none; padding: 0; margin: 1.5rem 0 0; }
.mag li {
  margin: 0 0 1.15rem; padding: 1.15rem 1.2rem 1.2rem;
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  transition: border-color 0.15s ease;
}
.mag li:hover { border-color: var(--link); }
.mag a.card {
  display: block; text-decoration: none; color: inherit;
}
.mag .date {
  font-family: var(--sans); font-variant-numeric: tabular-nums;
  font-size: 0.78rem; font-weight: 600; color: var(--muted); letter-spacing: 0.03em;
}
.mag .title {
  display: block; font-size: 1.12rem; font-weight: 650; margin: 0.3rem 0 0.45rem;
  line-height: 1.35; color: var(--fg); letter-spacing: -0.01em;
}
.mag .teaser {
  display: block; font-size: 0.92rem; color: var(--muted); line-height: 1.55;
  margin: 0 0 0.55rem;
}
.chips { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-top: 0.35rem; }
.chip {
  font-family: var(--sans); font-size: 0.68rem; padding: 0.15rem 0.5rem;
  border-radius: 999px; background: var(--bg); border: 1px solid var(--border);
  color: var(--muted); letter-spacing: 0.02em;
}
.extras {
  font-family: var(--sans); font-size: 0.78rem; color: var(--muted);
  margin-top: 0.55rem; padding-top: 0.45rem; border-top: 1px dashed var(--border);
}
.extras a { margin-right: 0.65rem; }

.back { font-family: var(--sans); font-size: 0.85rem; margin-bottom: 1.25rem; display: inline-block; }
.nav-days {
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  margin-top: 2.5rem; padding-top: 1rem; border-top: 1px solid var(--border);
  font-family: var(--sans); font-size: 0.85rem;
}
.nav-days a { max-width: 45%; }
.nav-days .dir { display: block; color: var(--muted); font-size: 0.72rem; margin-bottom: 0.15rem; }
.footer {
  margin-top: 3rem; padding-top: 1rem; border-top: 1px solid var(--border);
  font-family: var(--sans); font-size: 0.75rem; color: var(--muted);
}
.tag {
  font-family: var(--sans); font-size: 0.7rem; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--muted);
}
.lead-meta { color: var(--muted); font-family: var(--sans); font-size: 0.9rem; margin-top: -0.25rem; }
@media (max-width: 520px) {
  html { font-size: 17px; }
  .wrap { padding: 1.1rem 1rem 3rem; }
  .hero h1 { font-size: 1.4rem; }
}