:root {
  --bg: #fff;
  --text: #1b1b1b;
  --body: #3d3d3d;
  --muted: #767676;
  --faint: #a8a8a8;
  --line: #ececec;
  --line-soft: #f0f0f0;
  --link: #2f6f9f;
  --content: 700px;
  --toc: 208px;
  --gap: 56px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-variant-numeric: tabular-nums;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--text); text-decoration: underline; text-decoration-color: #cfcfcf; text-decoration-thickness: 1px; text-underline-offset: .22em; }
a:hover { color: var(--link); text-decoration-color: var(--link); }
a.muted { color: var(--muted); }

/* navbar */
.navbar { position: sticky; top: 0; z-index: 10; background: var(--bg); border-bottom: 1px solid var(--line); }
.navbar-inner {
  width: calc(100% - 40px); max-width: 1064px; margin-inline: auto; height: 60px;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; min-width: 0; }
/* Keep the generated mark crisp and unframed. */
.brand-mark {
  width: 32px; height: 32px; display: block; flex: none;
  border: 0; border-radius: 0; background: transparent;
}
.brand-name { font-size: 16px; font-weight: 700; letter-spacing: -.01em; white-space: nowrap; }
.navbar-links { display: flex; align-items: center; gap: 20px; font-size: 14px; flex: none; }
.navbar-links a { text-decoration: none; }
.navbar-links a.muted { color: #555; }

/* shell */
.shell {
  display: grid; grid-template-columns: minmax(0, var(--content)) var(--toc); gap: var(--gap);
  width: calc(100% - 40px); max-width: 1064px; margin-inline: auto; align-items: start;
  padding-bottom: 56px;
}
.shell > main { min-width: 0; padding-top: 52px; }
.shell-single { grid-template-columns: minmax(0, var(--content)); }

/* toc */
.toc { position: sticky; top: 84px; padding-top: 58px; min-width: 0; }
.toc-title { margin: 0 0 10px; font-size: 12px; letter-spacing: .04em; color: var(--faint); }
.toc-links { display: flex; flex-direction: column; gap: 2px; border-left: 1px solid var(--line); font-size: 13.5px; }
.toc-links a { padding: 5px 0 5px 14px; text-decoration: none; color: var(--body); }
.toc-links a.toc-sub { padding-left: 28px; color: var(--muted); }
.toc-links a.active { color: var(--link); }

/* digest & pages */
.digest-date { margin: 0 0 12px; font-size: 13.5px; color: var(--muted); }
.digest h1, .page h1 { margin: 0; font-size: clamp(26px, 3.6vw, 34px); font-weight: 700; line-height: 1.35; letter-spacing: -.02em; text-wrap: pretty; }
.digest-lede { margin: 8px 0 0; font-size: 16px; color: var(--muted); text-wrap: pretty; }

.prose { margin-top: 30px; }
.prose > p { font-size: 15px; color: var(--body); text-wrap: pretty; }
.prose > p:first-child { color: var(--muted); font-size: 14px; padding-left: 14px; border-left: 2px solid var(--line); }
.prose h2 {
  margin: 56px 0 0; padding-bottom: 8px; border-bottom: 1px solid var(--text);
  font-size: 26px; font-weight: 700; letter-spacing: -.02em; scroll-margin-top: 78px;
}
.prose h3 { margin: 36px 0 0; padding-bottom: 8px; border-bottom: 1px solid var(--line); font-size: 17px; font-weight: 700; scroll-margin-top: 78px; }

/* Ordinary ordered lists, such as the three-item verification list. */
.prose ol:not(.digest-list) { margin: 14px 0 24px; padding-left: 1.5rem; color: var(--body); }
.prose ol:not(.digest-list) > li { margin: 4px 0; padding-left: 4px; font-size: 15px; }

/* The semantic Top 30 list. */
.prose .digest-list { list-style: none; margin: 24px 0 0; padding: 0; counter-reset: item; }
.prose .digest-list > .digest-item {
  counter-increment: item; position: relative;
  padding: 26px 0 26px 42px; border-bottom: 1px solid var(--line-soft);
  font-size: 15px; color: var(--body); text-wrap: pretty;
}
.prose .digest-list > .digest-item::before {
  content: counter(item, decimal-leading-zero);
  position: absolute; left: 0; top: 26px; font-size: 13px; color: #bdbdbd;
}
.prose .digest-item-title {
  display: inline-block; margin-bottom: 4px; font-size: 18px; line-height: 1.5;
  font-weight: 700; letter-spacing: -.01em; color: var(--text);
}
.prose .digest-list > .digest-item a { font-size: 13px; color: var(--muted); }
.prose .digest-list > .digest-item a:hover { color: var(--link); }
.prose .digest-list > .digest-item strong:not(.digest-item-title) { font-size: inherit; line-height: inherit; color: inherit; }
.prose .digest-list > .digest-item:last-child { border-bottom: 0; padding-bottom: 8px; }
.prose > :last-child { margin-bottom: 0; }

/* The layout already renders the page title; hide the duplicate H1 from generated Markdown. */
.prose > h1:first-child { display: none; }

.prose ul { list-style: none; margin: 16px 0 0; padding: 0; display: flex; flex-direction: column; gap: 14px; }
.prose ul > li { font-size: 15px; color: var(--body); padding-left: 14px; border-left: 1px solid var(--line); text-wrap: pretty; }
.prose ul > li strong { color: var(--text); }
.prose code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .92em; background: #f6f6f4; padding: 1px 5px; border-radius: 3px; }

/* pager */
.pager {
  margin-top: 48px; padding-top: 20px; border-top: 1px solid var(--line);
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center;
  gap: 16px; font-size: 14px; min-height: 44px;
}
.pager > :first-child { justify-self: start; }
.pager > :last-child { justify-self: end; }
.pager a { text-decoration: none; }
.pager a:hover { text-decoration: underline; text-decoration-color: var(--link); }

/* archive */
.archive { margin-top: 36px; }
.archive-month { display: grid; grid-template-columns: 110px 1fr; gap: 16px; padding: 20px 0; border-top: 1px solid var(--line); align-items: start; }
.archive-label { margin: 0; font-size: 15px; font-weight: 700; }
.archive-days { display: flex; flex-wrap: wrap; gap: 6px 14px; font-size: 14px; }
.archive-days a { min-width: 22px; text-align: center; }

/* about */
.page h2 { margin: 36px 0 10px; font-size: 19px; font-weight: 700; }
.page p { font-size: 15px; color: var(--body); text-wrap: pretty; }
.page > p:first-of-type { font-size: 16px; }
.facts { margin: 26px 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.facts li { display: grid; grid-template-columns: 110px 1fr; gap: 16px; padding: 12px 0; border-bottom: 1px solid var(--line); font-size: 15px; }
.facts li span:first-child { color: var(--muted); }
.facts li span:last-child { overflow-wrap: anywhere; }
.notes { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 10px; font-size: 15px; color: var(--body); }
.notes li { display: grid; grid-template-columns: 14px 1fr; gap: 10px; text-wrap: pretty; }
.notes li::before { content: "—"; color: #c8c8c8; }

/* footer */
.site-footer { border-top: 1px solid var(--line); }
.site-footer-inner {
  width: calc(100% - 40px); max-width: 1064px; margin-inline: auto; padding: 22px 0;
  display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between;
  gap: 12px 24px; font-size: 13px; color: var(--muted);
}
.footer-links { display: flex; align-items: baseline; gap: 18px; flex: none; }
.site-footer-inner a { color: var(--muted); text-decoration: none; }
.site-footer-inner a:hover { color: var(--link); text-decoration: underline; }

@media (max-width: 1023px) {
  .shell { grid-template-columns: minmax(0, var(--content)); }
  .toc { display: none; }
}

/* Tablet and large e-ink readers: use the available page width and a slightly larger reading scale. */
@media (min-width: 641px) and (max-width: 1023px) {
  .shell { grid-template-columns: minmax(0, 1fr); }
  .shell > main { padding-top: 44px; }
  .digest h1, .page h1 { font-size: 32px; }
  .prose .digest-list > .digest-item { font-size: 16px; }
  .prose .digest-list > .digest-item::before { font-size: 13.5px; }
}

@media (max-width: 640px) {
  .navbar-links { gap: 14px; font-size: 13px; }
  .navbar-links a:nth-last-child(-n+2) { display: none; }
  .brand-name { font-size: 15px; }
  .shell > main { padding-top: 36px; }
  .archive-month, .facts li { grid-template-columns: 1fr; gap: 6px; }
  .site-footer-inner { flex-direction: column; align-items: flex-start; gap: 10px; }
}