:root {
  --paper: #f3ead8;
  --surface: #fbf6ec;
  --ink: #14213d;
  --ink-soft: #46506a;
  --cobalt: #2541b2;
  --cobalt-deep: #1b3190;
  --line: #d8c9a8;
  --r-box: 4px;
  --r-ctl: 2px;
  --cjk: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --lat: Verdana, "DejaVu Sans", sans-serif;
  --gut: 16px;
  --wide: 1180px;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--cjk);
  font-size: 16px;
  line-height: 1.75;
}
img { max-width: 100%; height: auto; }
a { color: var(--cobalt); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--cobalt-deep); text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--cobalt); outline-offset: 2px; }
code { font-family: var(--lat); font-size: .88em; background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-ctl); padding: 0 .3em; word-break: break-all; }

.jump { position: absolute; left: -999px; top: 8px; background: var(--ink); color: var(--paper); padding: 10px 14px; z-index: 5; }
.jump:focus { left: 8px; }

/* ── 页头 ── */
.mast { border-bottom: 1px solid var(--line); }
.mast__in { max-width: var(--wide); margin: 0 auto; padding: 0 var(--gut); display: flex; align-items: center; justify-content: space-between; gap: 8px; min-height: 60px; }
.mast__home { display: inline-flex; align-items: center; min-height: 44px; color: var(--ink); }
.wm { display: block; }
.mast__nav { display: flex; }
.mast__nav a { display: inline-flex; align-items: center; min-height: 44px; padding: 0 10px; color: var(--ink); text-decoration: none; font-size: 15px; border-bottom: 2px solid transparent; }
.mast__nav a:hover { border-bottom-color: var(--line); }
.mast__nav a[aria-current="page"] { border-bottom-color: var(--cobalt); color: var(--cobalt); }

main { max-width: var(--wide); margin: 0 auto; padding: 0 var(--gut) 56px; }

.crumbs { display: flex; flex-wrap: wrap; gap: 8px; padding: 18px 0 0; font-size: 14px; color: var(--ink-soft); }
.crumbs a { color: var(--ink-soft); }

/* ── 首页 ── */
.front__head { padding: 26px 0 18px; }
.front__h1 { margin: 0; font-size: 38px; line-height: 1.16; font-weight: 800; max-width: 15em; }
.front__lede { margin: 12px 0 0; font-size: 16px; color: var(--ink-soft); max-width: 40em; }

/* 横条码卡 */
.strip { display: grid; gap: 10px 28px; background: var(--surface); border: 1px solid var(--line); border-top: 4px solid var(--cobalt); border-radius: var(--r-box); padding: 14px 16px; margin: 0 0 18px; }
.strip__code { display: flex; align-items: center; flex-wrap: wrap; gap: 6px 12px; }
.strip__label { font-size: 14px; color: var(--ink-soft); }
.strip__val { font-family: var(--lat); font-weight: 700; font-size: 26px; letter-spacing: .06em; background: none; border: 0; padding: 0; color: var(--ink); }
.strip__copy { font: inherit; font-size: 15px; min-height: 44px; min-width: 84px; padding: 0 18px; background: var(--ink); color: var(--paper); border: 0; border-radius: var(--r-ctl); cursor: pointer; }
.strip__copy:hover { background: var(--cobalt); }
.strip__copy.is-done { background: var(--cobalt); }
.strip__text p { margin: 0; }
.strip__gain { font-size: 16px; font-weight: 600; }
.strip__star { font-family: var(--lat); color: var(--cobalt); font-size: .8em; }
.strip__fn { font-size: 13px; color: var(--ink-soft); line-height: 1.6; margin-top: 4px !important; }
.strip__go { display: inline-flex; align-items: center; min-height: 44px; margin-top: 12px; padding: 0 20px; background: var(--cobalt); color: #fff; text-decoration: none; border-radius: var(--r-ctl); font-weight: 600; }
.strip__go:hover { background: var(--cobalt-deep); color: #fff; }
.strip__note { font-size: 14px; color: var(--ink-soft); margin-top: 8px !important; line-height: 1.6; }

.front__grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 22px; }
.pick { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-box); padding: 14px 16px 16px; }
.pick__kicker { margin: 0; font-size: 14px; color: var(--cobalt); font-weight: 600; }
.pick__title { margin: 4px 0 6px; font-size: 19px; line-height: 1.45; }
.pick__title a { color: var(--ink); text-decoration: none; }
.pick__title a:hover { color: var(--cobalt); text-decoration: underline; }
.pick__blurb { margin: 0; font-size: 15px; color: var(--ink-soft); }
.pick__meta { margin: 8px 0 0; font-size: 13px; color: var(--ink-soft); }
.pick__go { display: inline-flex; align-items: center; min-height: 44px; margin-top: 10px; padding: 0 16px; border: 1.5px solid var(--cobalt); border-radius: var(--r-ctl); text-decoration: none; font-weight: 600; }

.ladder__h { margin: 0 0 6px; font-size: 15px; font-weight: 600; color: var(--ink-soft); }
.ladder__list { list-style: none; margin: 0; padding: 0; border-top: 2px solid var(--ink); }
.ladder__item a { display: grid; grid-template-columns: 64px 1fr; column-gap: 12px; align-items: center; padding: 12px 0 13px; border-bottom: 1px solid var(--line); text-decoration: none; color: var(--ink); }
.ladder__n { grid-row: 1 / span 2; align-self: center; font-family: var(--lat); font-size: 36px; line-height: 1; color: var(--cobalt); font-weight: 400; }
.ladder__t { font-size: 18px; font-weight: 700; line-height: 1.4; }
.ladder__hint { font-size: 14px; color: var(--ink-soft); line-height: 1.6; }
.ladder__item a:hover .ladder__n { color: var(--ink); }
.ladder__item a:hover .ladder__t { text-decoration: underline; text-underline-offset: 4px; }

.front__body { margin-top: 44px; }
.front__body > h2 { border-top: 2px solid var(--ink); padding-top: 14px; }
.prose .twin { display: grid; gap: 0 32px; }
.front__all { margin-top: 44px; border-top: 2px solid var(--ink); padding-top: 14px; max-width: 46em; }
.front__all h2 { margin: 0 0 8px; font-size: 22px; }
.front__posts { list-style: none; margin: 0; padding: 0; }
.front__posts li { padding: 10px 0; border-bottom: 1px solid var(--line); }
.front__posts a { font-weight: 700; font-size: 17px; }
.front__posts span { display: block; font-size: 14px; color: var(--ink-soft); }
.front__more a { display: inline-flex; min-height: 44px; align-items: center; }

/* ── 正文排版 ── */
.prose { font-size: 16px; line-height: 1.85; max-width: 38em; overflow-wrap: anywhere; }
.prose p, .prose ul, .prose ol { margin: 0 0 1.05em; }
.prose ul, .prose ol { padding-left: 1.4em; }
.prose li { margin: .3em 0; }
.prose h2 { font-size: 24px; line-height: 1.4; margin: 2.2em 0 .7em; }
.prose h3 { font-size: 19px; line-height: 1.45; margin: 1.7em 0 .5em; }
.prose strong { font-weight: 700; }
.prose .stop { background: var(--surface); border-left: 4px solid var(--cobalt); padding: 10px 14px; border-radius: 0 var(--r-box) var(--r-box) 0; }
.prose .trap { border: 1px dashed var(--ink-soft); padding: 10px 14px; border-radius: var(--r-box); }
.prose .aside-note { font-size: 14px; color: var(--ink-soft); }

.plate { margin: 1.4em 0 1.6em; }
.plate__frame { background: var(--ink); border-radius: var(--r-box); padding: 10px; }
.plate__frame img { display: block; margin: 0 auto; border-radius: var(--r-ctl); }
.plate__cap { margin-top: 8px; font-size: 14px; line-height: 1.6; color: var(--ink-soft); padding-left: 10px; border-left: 2px solid var(--line); }

.sheetbox { overflow-x: auto; margin: 1.2em 0 1.5em; border: 1px solid var(--line); border-radius: var(--r-box); background: var(--surface); }
.sheetbox table { border-collapse: collapse; width: 100%; min-width: 540px; font-size: 15px; line-height: 1.6; }
.sheetbox th, .sheetbox td { text-align: left; vertical-align: top; padding: 9px 12px; border-bottom: 1px solid var(--line); }
.sheetbox th { background: var(--paper); font-weight: 700; }
.sheetbox tr:last-child td { border-bottom: 0; }

/* ── 文章页 ── */
.post__head { padding: 18px 0 8px; }
.post__h1 { margin: 0; font-size: 38px; line-height: 1.2; font-weight: 800; max-width: 20em; }
.post__dek { margin: 12px 0 0; font-size: 17px; color: var(--ink-soft); max-width: 40em; }
.post__by { margin: 10px 0 0; font-size: 14px; color: var(--ink-soft); }
.post__cover { margin: 18px 0 8px; }
.post__cover img { display: block; width: 100%; border: 1px solid var(--line); border-radius: var(--r-box); }
.post__cover figcaption { font-size: 14px; color: var(--ink-soft); margin-top: 6px; }
.post__grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 18px; margin-top: 18px; }
.post__grid > * { min-width: 0; }
.checks { border: 1px solid var(--line); border-radius: var(--r-box); background: var(--surface); padding: 12px 14px; align-self: start; }
.checks__h { margin: 0 0 6px; font-size: 15px; font-weight: 700; }
.checks nav > ol { list-style: none; margin: 0; padding: 0; counter-reset: cp; }
.checks nav li { counter-increment: cp; margin: 0; }
.checks nav a { display: flex; gap: 10px; padding: 6px 0; min-height: 40px; align-items: baseline; font-size: 14px; line-height: 1.5; color: var(--ink); text-decoration: none; border-bottom: 1px dotted var(--line); }
.checks nav a::before { content: counter(cp, decimal-leading-zero); font-family: var(--lat); font-size: 12px; color: var(--cobalt); flex: none; width: 1.9em; }
.checks nav a:hover { color: var(--cobalt); }
.post__body { counter-reset: h2c; }
.post__body > h2 { counter-increment: h2c; border-top: 2px solid var(--ink); padding-top: 12px; scroll-margin-top: 16px; }
.post__body > h2:not(#qa-h)::before { content: "检查点 " counter(h2c, decimal-leading-zero); display: block; font-size: 13px; font-weight: 600; color: var(--cobalt); margin-bottom: 2px; font-family: var(--cjk); }
.qa { margin-top: 2.4em; }
.qa > h2 { border-top: 2px solid var(--ink); padding-top: 12px; font-size: 24px; }
.qa__item { border-bottom: 1px solid var(--line); padding: 2px 0 6px; }
.qa__item h3 { font-size: 17px; margin: 1em 0 .3em; }
.post__after { margin-top: 40px; display: grid; gap: 20px; max-width: 52em; }
.tagrow__label, .onward__h { margin: 0 0 6px; font-size: 14px; font-weight: 700; color: var(--ink-soft); }
.tagrow__list { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.tagrow__list span, .tagrow__list a { display: inline-block; padding: 4px 10px; border: 1px solid var(--line); border-radius: var(--r-ctl); background: var(--surface); font-size: 14px; color: var(--ink); }
.onward ul { margin: 0; padding-left: 1.2em; }
.onward li { margin: 2px 0; }
.onward a { display: inline-block; padding: 8px 0; }

/* ── 列表 / 站务 / 搜索 ── */
.shelf__head, .memo__head, .finder__head { padding: 18px 0 6px; }
.shelf__h1, .memo__h1, .finder__h1 { margin: 0; font-size: 38px; line-height: 1.2; font-weight: 800; }
.shelf__intro { max-width: 38em; color: var(--ink-soft); }
.shelf__count { font-size: 14px; color: var(--ink-soft); margin: 0; }
.post-list { list-style: none; margin: 18px 0 0; padding: 0; border-top: 2px solid var(--ink); max-width: 48em; }
.post-list__item { padding: 16px 0; border-bottom: 1px solid var(--line); }
.post-list__t { margin: 0; font-size: 21px; line-height: 1.45; }
.post-list__t a { color: var(--ink); }
.post-list__d { margin: 6px 0 0; color: var(--ink-soft); }
.post-list__m { margin: 4px 0 0; font-size: 13px; color: var(--ink-soft); font-family: var(--lat); }
.pager { display: flex; gap: 18px; align-items: center; margin-top: 20px; }
.pager a { display: inline-flex; min-height: 44px; align-items: center; }
.topic-list { list-style: none; padding: 0; }
.memo__date { margin: 8px 0 0; font-size: 14px; color: var(--ink-soft); }
.memo__body { margin-top: 18px; }
.memo__more { margin-top: 36px; border-top: 1px solid var(--line); padding-top: 12px; max-width: 38em; }
.memo__more p { margin: 0 0 4px; font-weight: 700; font-size: 14px; color: var(--ink-soft); }
.memo__more ul { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 0 16px; }
.memo__more a { display: inline-flex; min-height: 44px; align-items: center; }
.finder__form { margin-top: 16px; max-width: 38em; }
.finder__form label { display: block; font-size: 14px; color: var(--ink-soft); margin-bottom: 4px; }
.finder__row { display: flex; gap: 8px; }
.finder__row input { flex: 1; min-width: 0; min-height: 46px; font: inherit; padding: 0 12px; border: 1.5px solid var(--ink-soft); border-radius: var(--r-ctl); background: #fff; color: var(--ink); }
.finder__row button { font: inherit; min-height: 46px; padding: 0 18px; background: var(--ink); color: var(--paper); border: 0; border-radius: var(--r-ctl); cursor: pointer; }
.finder__state { color: var(--ink-soft); font-size: 15px; }
.finder__hits { list-style: none; padding: 0; margin: 0; max-width: 46em; }
.finder__hits li { padding: 12px 0; border-bottom: 1px solid var(--line); }
.finder__hits a { font-weight: 700; font-size: 17px; }
.finder__hits p { margin: 4px 0 0; font-size: 14px; color: var(--ink-soft); }

/* ── 页脚 ── */
.colo { background: var(--ink); color: #e9e1cf; }
.colo__in { max-width: var(--wide); margin: 0 auto; padding: 32px var(--gut) 36px; display: grid; gap: 18px; font-size: 14px; line-height: 1.75; }
.colo a { color: #fff; }
.colo :focus-visible { outline-color: var(--paper); }
.colo__home { display: inline-flex; min-height: 44px; align-items: center; color: var(--paper); }
.colo__id p { margin: 8px 0 0; max-width: 46em; }
.colo__nav { display: flex; flex-wrap: wrap; gap: 0 18px; }
.colo__nav a { display: inline-flex; min-height: 44px; align-items: center; }
.colo__feed, .colo__small { margin: 0; }
.colo__small { color: #b9b3a5; font-size: 13px; }

@media (min-width: 720px) {
  :root { --gut: 32px; }
  body { font-size: 17px; }
  .front__head { padding: 44px 0 26px; }
  .front__h1 { font-size: 54px; }
  .front__lede { font-size: 18px; }
  .strip { grid-template-columns: auto 1fr; align-items: center; padding: 16px 22px; }
  .strip__code { flex-wrap: nowrap; padding-right: 24px; border-right: 1px solid var(--line); }
  .strip--post { grid-template-columns: minmax(0, 1fr); }
  .strip--post .strip__code { border-right: 0; padding-right: 0; padding-bottom: 10px; border-bottom: 1px solid var(--line); }
  .strip__val { font-size: 32px; }
  .prose { font-size: 17px; }
  .prose .twin { grid-template-columns: 1fr 1fr; }
  .post__h1, .shelf__h1, .memo__h1, .finder__h1 { font-size: 48px; }
  .ladder__item a { grid-template-columns: 96px 1fr; }
  .ladder__n { font-size: 56px; }
  .ladder__t { font-size: 21px; }
  .prose h2 { font-size: 27px; }
}

@media (min-width: 1024px) {
  .front__h1 { font-size: 70px; }
  .post__h1 { font-size: 56px; }
  .front__grid { grid-template-columns: minmax(0, 1fr) 340px; gap: 48px; align-items: start; }
  .pick { grid-column: 2; grid-row: 1; position: sticky; top: 16px; }
  .ladder { grid-column: 1; grid-row: 1; }
  .post__grid { grid-template-columns: 232px minmax(0, 1fr); gap: 56px; }
  .checks { position: sticky; top: 16px; max-height: calc(100vh - 32px); overflow-y: auto; background: transparent; border: 0; border-top: 2px solid var(--ink); border-radius: 0; padding: 10px 0 0; }
  .colo__in { grid-template-columns: 1.3fr 1fr; }
  .colo__feed, .colo__small { grid-column: 1 / -1; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}