/* KYFIL · 问答手册：米白纸色 + 墨蓝；标题衬线、正文无衬线；二级标题是问句卡 */
:root {
  --paper: #f4efe4;
  --paper-deep: #ebe3d1;
  --paper-card: #fbf8f1;
  --ink: #1e3354;
  --ink-soft: #49607f;
  --text: #262c36;
  --muted: #5d6573;
  --rule: #cdc3ae;
  --rule-soft: #e2d9c4;
  --ochre: #a86f2a;
  --ochre-pale: #e6c38e;
  --ok: #2f6b4f;
  --warn: #8c4b1f;
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif;
  --sans: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
  --measure: 720px;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font: 17px/1.85 var(--sans);
  overflow-wrap: break-word;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
main { flex: 1 0 auto; }
img { max-width: 100%; height: auto; }
a { color: var(--ink); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--ochre); }
:focus-visible { outline: 2px solid var(--ochre); outline-offset: 2px; }
strong { color: var(--ink); font-weight: 700; }
sup { font-size: .7em; line-height: 0; }

.kf-jump { position: absolute; left: -999px; top: 8px; background: var(--ink); color: var(--paper); padding: 6px 12px; z-index: 9; }
.kf-jump:focus { left: 12px; }

/* —— 页首 —— */
.kf-mast { border-bottom: 1px solid var(--rule); background: var(--paper); }
.kf-mast-in { max-width: 1080px; margin: 0 auto; padding: 10px 20px; display: flex; align-items: center; justify-content: space-between; gap: 6px 20px; flex-wrap: wrap; }
.kf-brand { display: inline-flex; align-items: center; gap: 8px; color: var(--ink); text-decoration: none; }
.kf-brand span { font: 700 21px/1 Georgia, "Times New Roman", serif; letter-spacing: .14em; }
.kf-mark { flex: none; }
.kf-nav { display: flex; flex-wrap: wrap; gap: 2px 18px; font-size: 15px; }
.kf-nav a { color: var(--ink-soft); text-decoration: none; padding: 4px 0; border-bottom: 2px solid transparent; }
.kf-nav a:hover { color: var(--ink); border-bottom-color: var(--ochre-pale); }
.kf-nav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--ochre); }

/* —— 首屏：居中一个大问句，码卡在下 —— */
.kf-cover {
  padding: 34px 20px 30px;
  text-align: center;
  background:
    repeating-linear-gradient(to bottom, transparent 0 39px, rgba(205, 195, 174, .35) 39px 40px),
    var(--paper);
  border-bottom: 1px solid var(--rule);
}
.kf-eyebrow { margin: 0 0 12px; font-size: 13.5px; letter-spacing: .12em; color: var(--ochre); }
.kf-cover .kf-eyebrow { display: inline-flex; align-items: center; gap: 12px; }
.kf-cover .kf-eyebrow::before, .kf-cover .kf-eyebrow::after { content: ""; width: 28px; height: 1px; background: var(--ochre); }
.kf-cover h1 {
  max-width: 820px; margin: 0 auto 22px;
  font: 800 clamp(25px, 5.6vw, 44px)/1.3 var(--serif);
  color: var(--ink); letter-spacing: .01em;
}
.kf-cover-body { max-width: 640px; margin: 0 auto; text-align: left; }
.kf-cover-body > p { margin: 14px 0 0; font-size: 16.5px; }
.kf-byline { max-width: 640px; margin: 16px auto 0; font-size: 13.5px; color: var(--muted); text-align: left; }
.kf-byline span { margin-left: 12px; }

/* 码卡：一张带骑缝线的票据 */
.kf-card {
  position: relative;
  margin: 0 auto;
  max-width: 560px;
  background: var(--paper-card);
  border: 1.5px solid var(--ink);
  border-radius: 6px;
  --pad: 18px;
  padding: 16px var(--pad) 14px;
  text-align: left;
  box-shadow: 4px 4px 0 var(--paper-deep);
}
.kf-card-row { position: relative; display: flex; align-items: center; flex-wrap: wrap; gap: 6px 12px; padding-bottom: 12px; border-bottom: 1.5px dashed var(--rule); }
.kf-card-row::before, .kf-card-row::after { content: ""; position: absolute; bottom: -9px; width: 16px; height: 16px; border-radius: 50%; background: var(--paper); border: 1.5px solid var(--ink); }
.kf-card-row::before { left: calc(-1 * var(--pad) - 9.5px); border-left-color: transparent; border-bottom-color: transparent; transform: rotate(45deg); }
.kf-card-row::after { right: calc(-1 * var(--pad) - 9.5px); border-right-color: transparent; border-top-color: transparent; transform: rotate(45deg); }
.kf-card-lab { flex: 1 0 100%; font-size: 13px; color: var(--muted); letter-spacing: .08em; }
.kf-code { font: 700 30px/1.1 var(--mono); letter-spacing: .12em; color: var(--ink); user-select: all; }
.kf-copy {
  margin-left: auto;
  font: 600 15px/1 var(--sans);
  color: var(--ink); background: transparent;
  border: 1.5px solid var(--ink); border-radius: 999px;
  padding: 9px 16px; cursor: pointer; min-height: 44px;
}
.kf-copy:hover { background: var(--paper-deep); }
.kf-copy.is-done { background: var(--ok); border-color: var(--ok); color: #fff; }
.kf-gain { margin: 12px 0 10px; font: 700 17px/1.5 var(--serif); color: var(--ink); }
.kf-gain sup { color: var(--ochre); }
.kf-go {
  display: block; text-align: center; text-decoration: none;
  background: var(--ink); color: var(--paper);
  font: 600 16px/1.3 var(--sans);
  padding: 13px 14px; border-radius: 4px;
}
.kf-go:hover { background: #142540; color: #fff; }
.kf-go::after { content: " ↗"; }
.kf-fine { margin: 10px 0 0; font-size: 13px; line-height: 1.65; color: var(--muted); }
.kf-fine a { color: var(--ink-soft); }

/* —— 问题目录 —— */
.kf-index { max-width: var(--measure); margin: 30px auto 0; padding: 0 20px; }
.kf-index-h { margin: 0 0 10px; font: 700 15px/1.4 var(--serif); color: var(--ochre); letter-spacing: .06em; }
.kf-index ol { list-style: none; margin: 0; padding: 0; counter-reset: idx; border-top: 1px solid var(--rule); }
.kf-index li { counter-increment: idx; border-bottom: 1px solid var(--rule-soft); }
.kf-index a { display: flex; gap: 14px; align-items: baseline; padding: 10px 2px; min-height: 44px; text-decoration: none; color: var(--ink); line-height: 1.5; }
.kf-index a::before { content: "问 " counter(idx, decimal-leading-zero); flex: none; width: 3.6em; font: 600 13px/1.5 var(--serif); color: var(--ochre); }
.kf-index a:hover { background: var(--paper-deep); }

/* —— 正文 —— */
.kf-text { max-width: var(--measure); margin: 0 auto; padding: 8px 20px 40px; counter-reset: q; }
.kf-text p { margin: 0 0 1.05em; }
.kf-text h3 {
  margin: 2em 0 .6em;
  font: 700 20px/1.45 var(--serif); color: var(--ink);
  padding-left: 14px; border-left: 3px solid var(--ochre);
  scroll-margin-top: 16px;
}
.kf-text ul, .kf-text ol { padding-left: 1.4em; margin: 0 0 1.1em; }
.kf-text li { margin: .25em 0; }

/* 二级标题 = 问句卡 */
.kf-q {
  position: relative; overflow: hidden;
  margin: 56px 0 22px;
  padding: 16px 20px 18px;
  background: var(--ink); color: var(--paper);
  border-radius: 6px;
  font: 700 clamp(21px, 3.6vw, 26px)/1.4 var(--serif);
  counter-increment: q;
  scroll-margin-top: 12px;
}
.kf-q-no { display: block; margin-bottom: 4px; font: 600 13px/1.4 var(--serif); letter-spacing: .14em; color: var(--ochre-pale); }
.kf-q-no::before { content: "问 " counter(q, decimal-leading-zero); }
.kf-q-t { display: block; position: relative; padding-right: 36px; }
.kf-q::after { content: "?"; position: absolute; right: 14px; bottom: -22px; font: 700 88px/1 Georgia, serif; color: rgba(244, 239, 228, .09); pointer-events: none; }

/* 五屏条 */
.kf-flow { margin: 24px 0 28px; }
.kf-flow ol { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 10px; counter-reset: none; }
.kf-flow li {
  position: relative; margin: 0;
  background: var(--paper-card); border: 1.5px solid var(--rule); border-radius: 14px;
  padding: 26px 10px 14px; min-height: 150px;
  display: flex; flex-direction: column; gap: 6px; text-align: center;
}
.kf-flow li::before { content: ""; position: absolute; top: 9px; left: 50%; width: 26px; height: 4px; margin-left: -13px; border-radius: 2px; background: var(--rule); }
.kf-flow li:not(:last-child)::after { content: "→"; position: absolute; right: -10px; top: 50%; transform: translate(50%, -50%); color: var(--ink-soft); font-size: 15px; }
.kf-flow-no { font: 700 13px/1 var(--serif); color: var(--ochre); }
.kf-flow b { font: 700 15.5px/1.35 var(--serif); color: var(--ink); }
.kf-flow-d { font-size: 13px; line-height: 1.5; color: var(--muted); }
.kf-flow li.is-on { background: var(--ink); border-color: var(--ink); }
.kf-flow li.is-on::before { background: var(--ochre-pale); }
.kf-flow li.is-on b { color: var(--paper); }
.kf-flow li.is-on .kf-flow-d { color: #d9e0ea; }
.kf-flow li.is-on .kf-flow-no { color: var(--ochre-pale); }
.kf-flow figcaption { margin-top: 10px; font-size: 14px; color: var(--muted); }

/* 步骤表 */
.kf-steps { list-style: none; padding: 0 !important; margin: 18px 0 24px; counter-reset: st; }
.kf-steps li { counter-increment: st; position: relative; padding: 0 0 16px 52px; margin: 0; }
.kf-steps li::before {
  content: counter(st); position: absolute; left: 0; top: 0;
  width: 34px; height: 34px; border-radius: 50%;
  border: 1.5px solid var(--ink); color: var(--ink);
  font: 700 16px/31px var(--serif); text-align: center; background: var(--paper-card);
}
.kf-steps li:not(:last-child)::after { content: ""; position: absolute; left: 17px; top: 38px; bottom: 4px; width: 1.5px; background: var(--rule); }
.kf-step-name { margin: 2px 0 2px !important; font: 700 17px/1.5 var(--serif); color: var(--ink); }
.kf-step-text { margin: 0 !important; }

/* 表格 */
.kf-table { margin: 18px 0 26px; overflow-x: auto; border: 1px solid var(--rule); border-radius: 6px; background: var(--paper-card); }
.kf-table table { width: 100%; border-collapse: collapse; font-size: 15px; line-height: 1.65; }
.kf-table th { background: var(--paper-deep); color: var(--ink); font-family: var(--serif); text-align: left; padding: 10px 12px; }
.kf-table td { padding: 10px 12px; border-top: 1px solid var(--rule-soft); vertical-align: top; }

/* 依据、提示 */
.kf-basis { margin: 40px 0 0; padding: 16px 18px; border: 1px dashed var(--ink-soft); border-radius: 6px; font-size: 15px; color: var(--muted); }
.kf-basis-h { margin: 0 0 6px !important; font: 700 14px/1.4 var(--serif); color: var(--ink); letter-spacing: .06em; }
.kf-basis p:last-child { margin-bottom: 0; }
.kf-note { position: relative; margin: 22px 0; padding: 14px 18px; border-radius: 6px; background: var(--paper-card); border: 1px solid var(--rule-soft); border-left: 4px solid var(--ink-soft); }
.kf-note-lab { display: inline-block; margin: 0 0 6px !important; padding: 1px 9px; border-radius: 3px; font: 700 13px/1.6 var(--serif); letter-spacing: .1em; color: var(--paper); background: var(--ink-soft); }
.kf-note-warn { border-left-color: var(--ochre); }
.kf-note-warn .kf-note-lab { background: var(--ochre); }
.kf-note-stop { border-left-color: var(--warn); background: #f8efe6; }
.kf-note-stop .kf-note-lab { background: var(--warn); }
.kf-note-ok { border-left-color: var(--ok); }
.kf-note-ok .kf-note-lab { background: var(--ok); }
.kf-note-h { margin: 0 0 4px !important; font: 700 17px/1.5 var(--serif); color: var(--ink); }
.kf-note p:last-child, .kf-note ul:last-child { margin-bottom: 0; }

/* 按屏幕状态分流：左边是屏幕上那句原话，右边是该做什么 */
.kf-state { display: grid; grid-template-columns: minmax(0, 2fr) minmax(0, 3fr); margin: 18px 0; border: 1.5px solid var(--ink); border-radius: 8px; overflow: hidden; background: var(--paper-card); scroll-margin-top: 12px; }
.kf-state-screen { padding: 14px 16px; background: var(--ink); color: var(--paper); }
.kf-state-tag { margin: 0 0 6px !important; font-size: 13px; letter-spacing: .1em; color: var(--ochre-pale); }
.kf-state-say { margin: 0 !important; font: 600 16.5px/1.6 var(--sans); }
.kf-state-say::before { content: "\300C"; color: var(--ochre-pale); }
.kf-state-say::after { content: "\300D"; color: var(--ochre-pale); }
.kf-state-do { padding: 14px 18px; font-size: 16px; }
.kf-state-do p:last-child, .kf-state-do ul:last-child, .kf-state-do ol:last-child { margin-bottom: 0; }

/* 截图、自绘图、并排 */
.kf-shot, .kf-fig { margin: 22px 0 26px; }
.kf-shot-frame { border: 1px solid var(--rule); border-radius: 8px; overflow: hidden; background: #fff; box-shadow: 6px 6px 0 var(--paper-deep); }
.kf-shot img, .kf-fig img { display: block; width: 100%; height: auto; }
.kf-shot.is-phone .kf-shot-frame { max-width: 300px; margin: 0 auto; padding: 10px; border-radius: 30px; border: 0; background: #1b2433; }
.kf-shot.is-phone img { border-radius: 20px; }
.kf-fig img { border: 1px solid var(--rule); border-radius: 6px; background: var(--paper-card); }
.kf-shot figcaption, .kf-fig figcaption { margin-top: 10px; font-size: 14px; line-height: 1.6; color: var(--muted); }
.kf-shot.is-phone figcaption { text-align: center; }
.kf-pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin: 22px 0 26px; align-items: start; }
.kf-pair .kf-shot, .kf-pair .kf-fig { margin: 0; }
.kf-pair .kf-shot.is-phone .kf-shot-frame { padding: 7px; border-radius: 22px; }
.kf-pair .kf-shot.is-phone img { border-radius: 15px; }

/* 常见问题 */
.kf-faq-lead { color: var(--muted); }
.kf-faq-list { margin: 0; }
.kf-faq-item { padding: 16px 0; border-bottom: 1px solid var(--rule-soft); }
.kf-faq-item:first-child { border-top: 1px solid var(--rule); }
.kf-faq-item dt { position: relative; padding-left: 34px; font: 700 18px/1.5 var(--serif); color: var(--ink); }
.kf-faq-item dd { position: relative; margin: 8px 0 0; padding-left: 34px; }
.kf-faq-item dt::before, .kf-faq-item dd::before { position: absolute; left: 0; top: .15em; width: 22px; height: 22px; border-radius: 4px; font: 700 13px/22px var(--serif); text-align: center; }
.kf-faq-item dt::before { content: "问"; background: var(--ink); color: var(--paper); }
.kf-faq-item dd::before { content: "答"; border: 1px solid var(--ochre); color: var(--ochre); line-height: 20px; }

/* 文章末尾：接着可以看 */
.kf-related { margin: 36px 0 0; padding-top: 18px; border-top: 2px solid var(--ink); }
.kf-related-h { margin: 0 0 6px !important; font: 700 17px/1.4 var(--serif); color: var(--ink); }
.kf-related ul { list-style: none; margin: 0; padding: 0 !important; }
.kf-related li { margin: 0; border-bottom: 1px solid var(--rule-soft); }
.kf-related a { display: grid; gap: 2px; padding: 12px 0; min-height: 44px; text-decoration: none; color: var(--text); }
.kf-related b { font: 700 16.5px/1.5 var(--serif); color: var(--ink); }
.kf-related span { font-size: 14.5px; color: var(--muted); }
.kf-related a:hover b { color: var(--ochre); }

/* 首页：新写的问答（0 篇时模板不输出这一块） */
.kf-latest { margin: 48px 0 0; padding: 20px 20px 8px; background: var(--paper-card); border: 1.5px solid var(--ink); border-radius: 8px; box-shadow: 4px 4px 0 var(--paper-deep); }
.kf-latest-h { margin: 0 0 6px !important; font: 700 19px/1.4 var(--serif); color: var(--ink); }
.kf-latest ul { list-style: none; margin: 0; padding: 0 !important; }
.kf-latest li { margin: 0; border-top: 1px solid var(--rule-soft); }
.kf-latest a { display: grid; grid-template-columns: 4.2em minmax(0, 1fr); column-gap: 12px; padding: 12px 0; min-height: 44px; text-decoration: none; color: var(--text); }
.kf-latest time { grid-row: 1 / span 2; font: 600 14px/1.6 var(--mono); color: var(--ochre); }
.kf-latest b { font: 700 16.5px/1.5 var(--serif); color: var(--ink); }
.kf-latest span { font-size: 14.5px; line-height: 1.6; color: var(--muted); }
.kf-latest a:hover b { color: var(--ochre); }
.kf-latest-all { margin: 0 !important; padding: 2px 0 2px; border-top: 1px solid var(--rule-soft); text-align: right; font-size: 15px; }
.kf-latest-all a { display: inline-block; min-height: 44px; line-height: 44px; font-weight: 600; }
.kf-latest-all a::after { content: " \2192"; }

/* 署名 */
.kf-sign { margin: 40px 0 0; padding: 14px 16px; background: var(--paper-deep); border-radius: 6px; font-size: 14.5px; line-height: 1.75; }
.kf-sign p { margin: 0; }

/* —— 站务页、以后的文章页与列表页 —— */
.kf-wrap { margin: 0 auto; padding: 0 20px; }
.kf-narrow { max-width: calc(var(--measure) + 40px); }
.kf-crumbs { list-style: none; display: flex; gap: 4px; margin: 18px 0 0; padding: 0; font-size: 13.5px; color: var(--muted); white-space: nowrap; min-width: 0; }
.kf-crumbs li { flex: none; }
.kf-crumbs li:last-child { flex: 1 1 auto; min-width: 0; overflow: hidden; text-overflow: ellipsis; }
.kf-crumbs li + li::before { content: "/"; margin-right: 4px; color: var(--rule); }
.kf-pagehead { padding: 18px 0 18px; border-bottom: 1px solid var(--rule); margin-bottom: 18px; }
.kf-pagehead h1 { margin: 0; font: 800 clamp(25px, 4.6vw, 36px)/1.3 var(--serif); color: var(--ink); }
.kf-dek { margin: 12px 0 0; font-size: 17px; color: var(--ink-soft); }
.kf-wrap .kf-text { padding-left: 0; padding-right: 0; }
.kf-plain h2, .kf-plain .kf-q { margin: 2em 0 .6em; padding: 0 0 6px; background: none; border-radius: 0; border-bottom: 1px solid var(--rule); font: 700 22px/1.4 var(--serif); color: var(--ink); }
.kf-plain .kf-q-no { display: none; }
.kf-cover-img { margin: 0 0 18px; }
.kf-cover-img figcaption { font-size: 13.5px; color: var(--muted); }
.kf-intro p { margin: 10px 0 0; }
/* 栏目页、话题页、话题总表、404：墨蓝标题块 + 条目 */
.kf-404head { margin-top: 28px; }
.kf-404head .kf-eyebrow { font: 700 15px/1.4 var(--mono); letter-spacing: .2em; }
.kf-listhead { position: relative; overflow: hidden; margin: 14px 0 20px; padding: 22px 24px 24px; border: 0; border-radius: 8px; background: var(--ink); color: var(--paper); }
.kf-listhead .kf-eyebrow { color: var(--ochre-pale); }
.kf-listhead h1 { position: relative; color: var(--paper); }
.kf-listhead .kf-intro { position: relative; color: #dfe5ee; font-size: 16px; line-height: 1.8; }
.kf-listhead::after { content: "?"; position: absolute; right: 18px; bottom: -34px; font: 700 150px/1 Georgia, serif; color: rgba(244, 239, 228, .07); pointer-events: none; }
.kf-list { list-style: none; margin: 0 0 30px; padding: 0; border-top: 1px solid var(--rule); }
.kf-list li { border-bottom: 1px solid var(--rule-soft); }
.kf-list a { display: grid; gap: 2px; padding: 16px 8px; min-height: 44px; text-decoration: none; color: var(--text); }
.kf-list a:hover { background: var(--paper-deep); }
.kf-list a:hover b { color: var(--ochre); }
.kf-list b { font: 700 18px/1.5 var(--serif); color: var(--ink); }
.kf-list span { font-size: 15px; line-height: 1.7; color: var(--muted); }
.kf-list time, .kf-list em { font: 600 13.5px/1.7 var(--mono); font-style: normal; color: var(--ochre); }
.kf-list-dated a { grid-template-columns: 7.4em minmax(0, 1fr); column-gap: 14px; }
.kf-list-dated time { grid-row: 1 / span 2; padding-top: 3px; }
.kf-list-terms a { grid-template-columns: minmax(0, 1fr) auto; column-gap: 16px; }
.kf-list-terms em { grid-column: 2; grid-row: 1 / span 2; align-self: center; padding: 2px 10px; border: 1px solid var(--ochre); border-radius: 999px; font-family: var(--sans); }
.kf-tags { margin: 30px 0 0; font-size: 14px; display: flex; flex-wrap: wrap; gap: 6px 10px; align-items: center; }
.kf-tags .lab { color: var(--muted); }
.kf-tags a, .kf-tags span:not(.lab) { display: inline-flex; align-items: center; min-height: 34px; padding: 2px 12px; border-radius: 999px; text-decoration: none; }
.kf-tags a { border: 1.5px solid var(--ink); color: var(--ink); font-weight: 600; background: var(--paper-card); }
.kf-tags a::after { content: "\2192"; margin-left: 5px; font-weight: 400; color: var(--ochre); }
.kf-tags a:hover { background: var(--ink); color: var(--paper); }
.kf-tags span:not(.lab) { border: 1px dashed var(--rule); color: var(--muted); }
.kf-fanye { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin: 0 0 40px; font-size: 15px; }
.kf-fanye a, .kf-fanye .off { display: inline-flex; align-items: center; min-height: 44px; padding: 0 16px; border-radius: 999px; text-decoration: none; white-space: nowrap; }
.kf-fanye a { border: 1.5px solid var(--ink); color: var(--ink); font-weight: 600; background: var(--paper-card); }
.kf-fanye a:hover { background: var(--ink); color: var(--paper); }
.kf-fanye a[rel="prev"]::before { content: "\2190"; margin-right: 6px; }
.kf-fanye a[rel="next"]::after { content: "\2192"; margin-left: 6px; }
.kf-fanye .off { border: 1px dashed var(--rule); color: var(--rule); }
.kf-fanye .at { color: var(--muted); font-family: var(--mono); font-size: 13.5px; white-space: nowrap; }
.kf-ma { font: 700 1em var(--mono); letter-spacing: .08em; color: var(--ink); background: var(--paper-deep); padding: 1px 6px; border-radius: 3px; }

/* —— 页脚 —— */
.kf-colophon { background: var(--ink); color: #dfe5ee; margin-top: 30px; }
.kf-colophon-in { max-width: 1080px; margin: 0 auto; padding: 34px 20px 28px; display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 2fr); gap: 20px 48px; font-size: 14px; line-height: 1.8; }
.kf-colophon .kf-brand { color: var(--paper); margin-bottom: 8px; }
.kf-colophon p { margin: 0 0 10px; }
.kf-colophon a { color: #fff; }
.kf-colophon a:hover { color: var(--ochre-pale); }
.kf-colophon .risk { color: #b9c4d3; }
.kf-colophon-links { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 4px 18px; align-content: start; }
.kf-colophon-links a { text-decoration: none; padding: 3px 0; border-bottom: 1px solid rgba(255, 255, 255, .12); }
.kf-colophon-fine { grid-column: 1 / -1; margin: 6px 0 0 !important; padding-top: 14px; border-top: 1px solid rgba(255, 255, 255, .16); font-size: 13.5px; color: #b9c4d3; }

/* —— 宽屏：问题目录吸在左栏，正文在右 —— */
@media (min-width: 1180px) {
  .kf-home .kf-manual { display: grid; grid-template-columns: minmax(0, 1fr) 250px 720px minmax(0, 1fr); column-gap: 52px; }
  .kf-home .kf-cover { grid-column: 1 / -1; }
  .kf-home .kf-index { grid-column: 2; grid-row: 2; align-self: start; position: sticky; top: 18px; margin: 40px 0 0; padding: 0; max-height: calc(100vh - 36px); overflow-y: auto; }
  .kf-home .kf-index a { font-size: 14.5px; padding: 8px 2px; }
  .kf-home .kf-text { grid-column: 3; grid-row: 2; margin: 0; padding: 0 0 40px; max-width: none; }
  .kf-home .kf-text > .kf-q:first-child { margin-top: 40px; }
}

/* —— 文章页 —— */
.kf-post-wrap { max-width: calc(var(--measure) + 40px); margin: 0 auto; padding: 0 20px; }
.kf-post-wrap .kf-text { padding-left: 0; padding-right: 0; }
.kf-posthead { border-bottom: 0; margin-bottom: 8px; }
.kf-posthead h1 { font-size: clamp(25px, 4.8vw, 38px); }
.kf-posthead .kf-byline { margin: 14px 0 0; max-width: none; padding-top: 12px; border-top: 1px solid var(--rule); }
.kf-index-post { margin: 22px 0 6px; padding: 0; max-width: none; }
.kf-article .kf-card { margin: 24px 0; max-width: none; }
@media (min-width: 1180px) {
  .kf-post-wrap.has-toc { max-width: 1062px; }
  .kf-post-wrap.has-toc .kf-post { display: grid; grid-template-columns: 250px minmax(0, 720px); column-gap: 52px; }
  .kf-post-wrap.has-toc .kf-posthead, .kf-post-wrap.has-toc .kf-cover-img, .kf-post-wrap.has-toc .kf-text { grid-column: 2; }
  .kf-post-wrap.has-toc .kf-index-post { grid-column: 1; grid-row: 1 / span 3; align-self: start; position: sticky; top: 18px; margin-top: 64px; max-height: calc(100vh - 36px); overflow-y: auto; }
  .kf-post-wrap.has-toc .kf-index-post a { font-size: 14.5px; }
}

/* —— 窄屏 —— */
@media (max-width: 760px) {
  .kf-flow ol { grid-template-columns: 1fr; gap: 0; }
  .kf-flow li { flex-direction: row; flex-wrap: wrap; align-items: baseline; text-align: left; min-height: 0; padding: 11px 14px; border-radius: 0; border-bottom-width: 0; gap: 4px 10px; }
  .kf-flow li:first-child { border-radius: 10px 10px 0 0; }
  .kf-flow li:last-child { border-radius: 0 0 10px 10px; border-bottom-width: 1.5px; }
  .kf-flow li::before { display: none; }
  .kf-flow li:not(:last-child)::after { content: none; }
  .kf-flow-d { flex: 1 0 100%; padding-left: 22px; }
  .kf-colophon-in { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  body { font-size: 16px; line-height: 1.8; }
  .kf-mast-in { padding: 8px 16px; }
  .kf-nav { gap: 0 16px; font-size: 14.5px; }
  .kf-nav a { padding: 11px 0 9px; }
  .kf-cover { padding: 18px 16px 22px; }
  .kf-cover .kf-eyebrow { font-size: 13px; margin-bottom: 8px; }
  .kf-cover h1 { margin-bottom: 14px; }
  .kf-card { --pad: 14px; padding: 12px var(--pad) 12px; box-shadow: 3px 3px 0 var(--paper-deep); }
  .kf-card-row { padding-bottom: 10px; }
  .kf-code { font-size: 25px; }
  .kf-copy { padding: 8px 13px; font-size: 14px; min-height: 44px; }
  .kf-gain { font-size: 16px; margin: 10px 0 8px; }
  .kf-go { padding: 12px 10px; font-size: 15.5px; }
  .kf-fine { font-size: 13px; }
  .kf-cover-body > p { font-size: 16px; }
  .kf-index, .kf-text { padding-left: 16px; padding-right: 16px; }
  .kf-wrap { padding: 0 16px; }
  .kf-q { margin-top: 44px; padding: 14px 16px 15px; }
  .kf-text h3 { font-size: 18.5px; }
  .kf-table[data-cols="3"], .kf-table[data-cols="4"], .kf-table[data-cols="5"] { border: 0; background: transparent; overflow: visible; }
  .kf-table[data-cols="3"] thead, .kf-table[data-cols="4"] thead, .kf-table[data-cols="5"] thead { display: none; }
  .kf-table[data-cols="3"] tr, .kf-table[data-cols="4"] tr, .kf-table[data-cols="5"] tr { display: block; margin: 0 0 12px; border: 1px solid var(--rule); border-radius: 6px; background: var(--paper-card); }
  .kf-table[data-cols="3"] td, .kf-table[data-cols="4"] td, .kf-table[data-cols="5"] td { display: block; border-top: 1px solid var(--rule-soft); padding: 8px 12px; }
  .kf-table[data-cols="3"] td:first-child, .kf-table[data-cols="4"] td:first-child, .kf-table[data-cols="5"] td:first-child { border-top: 0; font-weight: 700; color: var(--ink); }
  .kf-table td[data-th]::before { content: attr(data-th); display: block; font-size: 13px; font-weight: 400; color: var(--ochre); letter-spacing: .04em; }
  .kf-colophon-in { padding: 28px 16px 24px; }
}
@media (max-width: 560px) {
  .kf-state { grid-template-columns: 1fr; }
  .kf-post-wrap { padding: 0 16px; }
  .kf-latest { padding: 16px 14px 6px; }
  .kf-latest a { grid-template-columns: 1fr; }
  .kf-latest time { grid-row: auto; font-size: 13px; }
}
@media (max-width: 400px) {
  .kf-pair { gap: 10px; }
  .kf-pair figcaption { font-size: 13px; }
}
@media (max-width: 600px) {
  .kf-listhead { padding: 18px 16px 20px; }
  .kf-list-dated a { grid-template-columns: 1fr; }
  .kf-list-dated time { grid-row: auto; padding-top: 0; }
}
@media (max-width: 420px) {
  .kf-cover .kf-eyebrow::before, .kf-cover .kf-eyebrow::after { display: none; }
  .kf-cover h1 { font-size: 24px; }
  .kf-go::after { content: "↗"; margin-left: 4px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
@media print {
  .kf-mast, .kf-colophon, .kf-index, .kf-copy, .kf-go { display: none; }
  body { background: #fff; }
  .kf-q { background: none; color: var(--ink); border: 1px solid var(--ink); }
}