/* ==========================================================================
   DES 加密演示  —  app.css

   视觉方向：1977 年的联邦技术出版物。
   纸面、蓝色油墨、印章红、编号章节、真实的图注与表注。
   没有卡片堆叠、没有渐变装饰、没有霓虹光晕。

   唯一的“大胆”之处留给比特矩阵，其余一切保持安静。
   ========================================================================== */

:root {
  /* 纸与墨 */
  --paper:      #f6f6f3;   /* 冷调纸白，不是暖奶油色 */
  --surface:    #ffffff;
  --ink:        #16181c;   /* 印刷墨，不是 #0B0B0B */
  --ink-2:      #3f444c;
  --ink-3:      #6b7280;
  --ink-4:      #9aa0a8;
  --rule:       #d9d9d3;
  --rule-soft:  #e9e9e4;

  /* 油墨色：深、略去饱和，像印在纸上而不是发光 */
  --federal:    #1c4587;   /* 主色：联邦蓝 */
  --stamp:      #9e2b25;   /* 密文 / 失败 */
  --machine:    #2c6e49;   /* 还原成功 */

  --c-plain:    #1c4587;   /* 原文 */
  --c-key:      #9a6212;   /* 钥匙 */
  --c-l:        #4a3f8f;   /* 左半边 */
  --c-r:        #14635c;   /* 右半边 */
  --c-f:        #7a3a8c;   /* 搅拌结果 */
  --c-cipher:   #9e2b25;   /* 密文 */

  --serif: Georgia, "Times New Roman", "Songti SC", "Noto Serif SC", SimSun, serif;
  --sans:  -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
           "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --mono:  "SF Mono", "Cascadia Mono", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

code, pre, .mono { font-family: var(--mono); }

a { color: var(--federal); }

:focus-visible {
  outline: 2px solid var(--federal);
  outline-offset: 2px;
  border-radius: 1px;
}

/* ============================================================ 报头 === */

.masthead {
  padding: 64px 32px 40px;
  border-bottom: 1px solid var(--rule);
  background: var(--surface);
}

.masthead > * { max-width: 1000px; margin-left: auto; margin-right: auto; }

.doc-line {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--ink-3);
  text-transform: none;
}

.masthead h1 {
  margin: 14px 0 0;
  font-family: var(--serif);
  font-size: clamp(30px, 4.4vw, 46px);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -.01em;
  max-width: 15em;
}

.lede {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: 17.5px;
  line-height: 1.85;
  color: var(--ink-2);
}

.lede strong { color: var(--ink); }

/* 详细程度切换 */

.mode-switch {
  display: inline-flex;
  gap: 0;
  margin-top: 34px;
  border: 1px solid var(--ink);
  background: var(--surface);
}

.mode-btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1px;
  padding: 11px 22px;
  border: 0;
  border-right: 1px solid var(--ink);
  background: transparent;
  font-family: inherit;
  color: var(--ink);
  cursor: pointer;
  text-align: left;
  transition: background .14s;
}
.mode-btn:last-child { border-right: 0; }
.mode-btn:hover { background: #f0f0ec; }
.mode-btn.is-on { background: var(--ink); color: var(--paper); }
.mode-name { font-size: 15px; font-weight: 600; }
.mode-desc { font-size: 11.5px; opacity: .72; }
.mode-btn.is-on .mode-desc { opacity: .8; }

/* ============================================================ 版面 === */

main {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 32px 96px;
}

.chapter {
  position: relative;
  padding: 60px 0 0 84px;
  border-top: 1px solid var(--rule);
  margin-top: 56px;
}
.chapter:first-of-type { border-top: 0; margin-top: 0; padding-top: 56px; }

.chapter > h2 {
  position: relative;
  margin: 0 0 14px;
  font-family: var(--serif);
  font-size: 27px;
  font-weight: 700;
  line-height: 1.3;
  max-width: 20em;
}

/* 悬挂在左边的章节号 —— 内容是真正有顺序的，编号才有意义 */
.chapter > h2 .num {
  position: absolute;
  left: -84px;
  top: .06em;
  width: 56px;
  text-align: right;
  font-family: var(--serif);
  font-size: 26px;
  font-weight: 400;
  color: var(--ink-4);
  font-variant-numeric: lining-nums;
}

.chapter-lede {
  margin: 0 0 26px;
  max-width: 40em;
  color: var(--ink-2);
  font-size: 15.5px;
  line-height: 1.85;
}
.chapter-lede strong { color: var(--ink); }
.chapter-lede code {
  font-size: 13.5px;
  background: #ececE6;
  padding: 1px 5px;
  border-radius: 2px;
}

/* 完整模式才有的章节 */
.chapter.is-full-only { display: none; }
body.detail-full .chapter.is-full-only { display: block; }

/* ====================================================== 1 输入区 === */

.try-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 26px 32px;
  max-width: 760px;
}

.field > label {
  display: block;
  margin-bottom: 7px;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-2);
}

.input-line { display: flex; gap: 8px; align-items: stretch; }

.input-line input[type=text],
.adv-fields input[type=text] {
  flex: 1;
  min-width: 0;
  padding: 11px 13px;
  border: 1px solid var(--ink-4);
  border-radius: 2px;
  background: var(--surface);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
}
.input-line input[type=text]:focus,
.adv-fields input:focus { border-color: var(--federal); outline-offset: 0; }

.ghost {
  flex: none;
  padding: 0 13px;
  border: 1px solid var(--rule);
  border-radius: 2px;
  background: transparent;
  color: var(--ink-2);
  font-family: inherit;
  font-size: 12.5px;
  cursor: pointer;
  white-space: nowrap;
  transition: border-color .14s, color .14s;
}
.ghost:hover { border-color: var(--ink-3); color: var(--ink); }

.field-note {
  margin: 7px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--ink-3);
}

.advanced {
  margin-top: 26px;
  max-width: 760px;
  border-top: 1px solid var(--rule-soft);
  padding-top: 14px;
}
.advanced > summary {
  cursor: pointer;
  font-size: 13.5px;
  color: var(--ink-2);
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 7px;
}
.advanced > summary::-webkit-details-marker { display: none; }
.advanced > summary::before {
  content: "+";
  font-family: var(--mono);
  font-size: 14px;
  color: var(--ink-4);
  width: 12px;
}
.advanced[open] > summary::before { content: "−"; }
.advanced > summary:hover { color: var(--ink); }

.adv-fields {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 16px 26px;
  margin-top: 18px;
}
.adv-fields label {
  display: block;
  font-size: 12.5px;
  color: var(--ink-3);
}
.adv-fields input {
  width: 100%;
  margin-top: 6px;
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: .06em;
}
.adv-fields .field-note { grid-column: 1 / -1; }
.adv-fields .ghost { padding: 6px 12px; margin-top: 8px; }

.actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 30px;
}

.primary, .secondary {
  padding: 12px 30px;
  border-radius: 2px;
  font-family: inherit;
  font-size: 15.5px;
  font-weight: 600;
  cursor: pointer;
  transition: background .14s, color .14s, border-color .14s;
}
.primary {
  border: 1px solid var(--federal);
  background: var(--federal);
  color: #fff;
}
.primary:hover:not(:disabled) { background: #163a72; border-color: #163a72; }
.secondary {
  border: 1px solid var(--ink-4);
  background: transparent;
  color: var(--ink);
}
.secondary:hover:not(:disabled) { border-color: var(--ink); background: #f0f0ec; }
.primary:disabled, .secondary:disabled { opacity: .45; cursor: not-allowed; }

.action-note { font-size: 12.5px; color: var(--ink-3); }

/* ====================================================== 结果图 === */

.result-figure {
  margin: 40px 0 0;
  border: 1px solid var(--rule);
  background: var(--surface);
  padding: 30px 34px 22px;
}

.result-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 26px;
  align-items: center;
}

.result-side { min-width: 0; }

.result-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--ink-3);
  letter-spacing: .02em;
}
.result-side.is-out .result-tag { color: var(--stamp); }

.result-read {
  margin: 9px 0 0;
  font-size: 21px;
  line-height: 1.45;
  word-break: break-all;
  font-weight: 600;
}
.result-read.dim { color: var(--ink-4); font-weight: 400; font-size: 17px; }
.result-side.is-out .result-read { color: var(--stamp); font-family: var(--mono); font-size: 18px; }
.result-read.dim { color: var(--ink-4); }
.result-side.is-out .result-read.dim { color: var(--ink-4); }

.result-hex {
  margin: 7px 0 0;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--ink-3);
  word-break: break-all;
}

.result-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  color: var(--ink-4);
}
.result-arrow svg { stroke: currentColor; stroke-width: 1.4; fill: none; }
.result-arrow span { font-size: 11.5px; color: var(--ink-3); }

.check-line {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--rule-soft);
  font-size: 13.5px;
}
.check-line.ok { color: var(--machine); }
.check-line.bad { color: var(--stamp); }

figcaption, .figure-note {
  margin: 18px 0 0;
  font-family: var(--serif);
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-3);
}
.result-figure figcaption { margin-top: 20px; }

/* ====================================================== 2 流程导航 === */

.flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 3px;
  padding: 14px 16px;
  border: 1px solid var(--rule);
  background: var(--surface);
  margin-bottom: 22px;
}

.flow-item {
  min-width: 30px;
  height: 30px;
  padding: 0 7px;
  border: 1px solid var(--rule);
  background: transparent;
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 11.5px;
  cursor: pointer;
  transition: background .12s, color .12s, border-color .12s;
}
.flow-item:hover { border-color: var(--ink-3); color: var(--ink); }
.flow-item.wide { font-family: var(--sans); font-size: 11.5px; padding: 0 10px; }
.flow-item.is-now {
  background: var(--federal);
  border-color: var(--federal);
  color: #fff;
  font-weight: 700;
}
.flow-item.is-past { color: var(--ink-2); border-color: var(--ink-4); }
.flow-sep {
  width: 12px;
  height: 1px;
  background: var(--rule);
  margin: 0 2px;
}

/* ====================================================== 舞台 === */

.stage {
  border: 1px solid var(--rule);
  background: var(--surface);
}

.stage-bar {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  padding: 12px 16px;
  border-bottom: 1px solid var(--rule-soft);
  background: #fbfbf9;
}

.transport { display: flex; gap: 2px; }

.tbtn {
  min-width: 38px;
  height: 34px;
  padding: 0 10px;
  border: 1px solid var(--rule);
  background: var(--surface);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 13px;
  cursor: pointer;
  transition: background .12s, border-color .12s;
}
.tbtn:hover { border-color: var(--ink-3); background: #f2f2ee; }
.tbtn.play { min-width: 76px; font-weight: 600; }
.tbtn.play.is-playing { background: var(--ink); border-color: var(--ink); color: var(--paper); }

.scrub-wrap { flex: 1; display: flex; align-items: center; gap: 12px; min-width: 200px; }
.counter { font-family: var(--mono); font-size: 12px; color: var(--ink-3); white-space: nowrap; }
.counter b { color: var(--ink); }

.speed { display: flex; align-items: center; gap: 9px; font-size: 12px; color: var(--ink-3); white-space: nowrap; }
.speed input { width: 88px; }

input[type=range] {
  -webkit-appearance: none;
  appearance: none;
  height: 3px;
  background: var(--rule);
  border-radius: 0;
  outline-offset: 4px;
  cursor: pointer;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 13px; height: 13px;
  background: var(--federal);
  border: 0;
  border-radius: 50%;
  cursor: pointer;
}
input[type=range]::-moz-range-thumb {
  width: 13px; height: 13px;
  background: var(--federal);
  border: 0; border-radius: 50%; cursor: pointer;
}

.stage-figure { margin: 0; padding: 24px 26px 18px; }

.stage-head { margin-bottom: 14px; }
.stage-head h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.35;
}
.stage-sub {
  margin: 5px 0 0;
  font-size: 13px;
  color: var(--ink-3);
  font-family: var(--mono);
}

.stage-plain {
  margin: 0 0 20px;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-2);
}

.stage-body {
  position: relative;
  overflow-x: auto;
  padding: 4px 0 2px;
  min-height: 80px;
}

svg.links {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  overflow: visible;
  z-index: 4;
}
svg.links path { fill: none; stroke: var(--federal); stroke-width: 1.4; }

/* ---------------------------------------------- 比特行 --- */

.bitrows { display: flex; flex-direction: column; gap: 17px; position: relative; z-index: 2; }
.bitrow { display: flex; flex-direction: column; gap: 7px; }

.bitrow-head { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.bitrow-label { font-size: 12.5px; font-weight: 600; color: var(--ink-2); }
.bitrow[data-role=plain]  .bitrow-label { color: var(--c-plain); }
.bitrow[data-role=key]    .bitrow-label { color: var(--c-key); }
.bitrow[data-role=l]      .bitrow-label { color: var(--c-l); }
.bitrow[data-role=r]      .bitrow-label { color: var(--c-r); }
.bitrow[data-role=f]      .bitrow-label { color: var(--c-f); }
.bitrow[data-role=cipher] .bitrow-label { color: var(--c-cipher); }
.bitrow-note { font-size: 11.5px; color: var(--ink-4); }

.bits { display: flex; flex-wrap: wrap; gap: 11px; }
.bitgroup { display: flex; gap: 2px; }

/* 比特格子：纸上的小方格，1 是实心墨块，0 是空心 */
.bit {
  width: 17px; height: 29px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--rule);
  background: var(--surface);
  color: var(--ink-4);
  font-family: var(--mono);
  font-size: 11px;
  flex: none;
  position: relative;
  transition: background .1s, border-color .1s, color .1s, box-shadow .1s;
}
.bit .idx { font-size: 7px; line-height: 1; opacity: .5; margin-top: 1px; }

.bit.one { color: #fff; font-weight: 700; border-color: transparent; }
.bitrow[data-role=plain]  .bit.one { background: var(--c-plain); }
.bitrow[data-role=key]    .bit.one { background: var(--c-key); }
.bitrow[data-role=l]      .bit.one { background: var(--c-l); }
.bitrow[data-role=r]      .bit.one { background: var(--c-r); }
.bitrow[data-role=f]      .bit.one { background: var(--c-f); }
.bitrow[data-role=cipher] .bit.one { background: var(--c-cipher); }
.bitrow[data-role=result] .bit.one { background: var(--ink); }

.bit.mark { box-shadow: 0 0 0 2px var(--surface), 0 0 0 3px var(--ink-4); }

.bit.srchit {
  box-shadow: 0 0 0 2px var(--federal);
  transform: translateY(-2px);
  z-index: 6;
}
.bit.dsthit { box-shadow: 0 0 0 2px var(--ink); z-index: 6; }

@keyframes bit-in {
  from { opacity: 0; transform: scale(.7); }
  to   { opacity: 1; transform: scale(1); }
}
.bit.anim { animation: bit-in .26s ease-out both; }

.hover-readout {
  margin: 14px 0 0;
  min-height: 20px;
  font-size: 12.5px;
  color: var(--ink-3);
}
.hover-readout b { color: var(--federal); font-family: var(--mono); }

.tech { margin-top: 20px; border-top: 1px solid var(--rule-soft); padding-top: 12px; }
.tech > summary {
  cursor: pointer;
  font-size: 12.5px;
  color: var(--ink-3);
  list-style: none;
}
.tech > summary::-webkit-details-marker { display: none; }
.tech > summary::before { content: "▸ "; color: var(--ink-4); }
.tech[open] > summary::before { content: "▾ "; }
.tech > p {
  margin: 10px 0 0;
  max-width: 44em;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--ink-2);
}

.stage-figure figcaption { margin-top: 20px; padding-top: 14px; border-top: 1px solid var(--rule-soft); }

/* ---------------------------------------------- 置换表 --- */

.table-strip { margin-top: 18px; }
.table-strip > summary {
  cursor: pointer;
  font-size: 12.5px;
  color: var(--ink-3);
  list-style: none;
}
.table-strip > summary::-webkit-details-marker { display: none; }
.table-strip > summary::before { content: "▸ "; color: var(--ink-4); }
.table-strip[open] > summary::before { content: "▾ "; }
.table-values { display: flex; flex-wrap: wrap; gap: 2px; margin-top: 10px; }
.table-values span {
  min-width: 22px;
  text-align: center;
  padding: 3px 4px;
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--ink-3);
  border: 1px solid var(--rule-soft);
}
.table-values span.hot { background: var(--federal); border-color: var(--federal); color: #fff; }

/* ---------------------------------------------- S 盒 --- */

.sbox-wrap { display: flex; flex-direction: column; gap: 20px; }
.sbox-inout { display: flex; flex-direction: column; gap: 15px; }
.sbox-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 16px; }

.sbox-card { border: 1px solid var(--rule); padding: 12px 13px; }
.sbox-card.active { border-color: var(--c-f); }

.sbox-card-head {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 10px; margin-bottom: 9px; flex-wrap: wrap;
}
.sbox-name { font-family: var(--mono); font-size: 12.5px; font-weight: 700; color: var(--c-f); }
.sbox-io { font-family: var(--mono); font-size: 11px; color: var(--ink-3); }
.sbox-io b { color: var(--ink); }
.sbox-io .val { color: var(--machine); font-weight: 700; }

table.sbox { border-collapse: collapse; width: 100%; font-family: var(--mono); font-size: 9.5px; }
table.sbox th, table.sbox td {
  border: 1px solid var(--rule-soft);
  text-align: center;
  padding: 2px 0;
  color: var(--ink-3);
}
table.sbox th { background: #f4f4f0; font-weight: 400; }
table.sbox td.rowhead, table.sbox th.rowhead { background: #f4f4f0; color: var(--ink-2); width: 8%; }
table.sbox td.hot-row, table.sbox th.hot-row { background: #e7ebf4; color: var(--ink); }
table.sbox td.hot-col, table.sbox th.hot-col { background: #e7ebf4; color: var(--ink); }
table.sbox td.hit { background: var(--c-f); color: #fff; font-weight: 700; }

.sbox-formula {
  margin-top: 9px;
  font-family: var(--mono);
  font-size: 10.5px;
  line-height: 1.8;
  color: var(--ink-3);
}
.sbox-formula em { color: var(--federal); font-style: normal; }
.sbox-formula b { color: var(--machine); }

/* ====================================================== 3 密钥编排 === */

.ks-top { display: flex; flex-direction: column; gap: 16px; margin-bottom: 28px; }

.ks-table-wrap { border: 1px solid var(--rule); background: var(--surface); }
.ks-head, .ks-row {
  display: grid;
  grid-template-columns: 44px 72px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 6px 16px;
}
.ks-head {
  border-bottom: 1px solid var(--rule);
  background: #fbfbf9;
  font-size: 11px;
  color: var(--ink-3);
  padding-top: 9px;
  padding-bottom: 9px;
}
.ks-rounds { }   /* 16 行全部展示，不做内部滚动 —— 这是文件表格，不是面板 */
.ks-row {
  font-family: var(--mono);
  font-size: 11px;
  border-bottom: 1px solid var(--rule-soft);
  transition: background .12s;
}
.ks-row:last-child { border-bottom: 0; }
.ks-row:hover { background: #f7f7f4; }
.ks-row.is-now { background: #eef1f7; }
.ks-n { color: var(--ink-3); }
.ks-row.is-now .ks-n { color: var(--federal); font-weight: 700; }
.ks-shift { color: var(--ink-4); font-size: 10.5px; }
/* 刻意允许换行：比特串绝不能因为放不下就被省略号吃掉 */
.ks-k {
  color: var(--ink-3);
  font-size: 10.5px;
  overflow-wrap: anywhere;
  white-space: normal;
}
.ks-row.is-now .ks-k { color: var(--c-key); font-weight: 700; }

.ks-detail { margin-top: 34px; }

/* ====================================================== 4 现象 === */

.tabs { display: flex; gap: 0; flex-wrap: wrap; border-bottom: 1px solid var(--ink); }
.tab {
  padding: 10px 20px;
  border: 1px solid transparent;
  border-bottom: 0;
  background: transparent;
  color: var(--ink-3);
  font-family: inherit;
  font-size: 14px;
  cursor: pointer;
  margin-bottom: -1px;
  transition: color .14s, background .14s;
}
.tab:hover { color: var(--ink); }
.tab.is-on {
  border-color: var(--ink);
  border-bottom: 1px solid var(--surface);
  background: var(--surface);
  color: var(--ink);
  font-weight: 600;
}

.panel { display: none; padding-top: 26px; }
.panel.is-on { display: block; }

.heat-row { display: flex; align-items: flex-start; gap: 18px; flex-wrap: wrap; margin-bottom: 14px; }
.heat-title { min-width: 150px; font-size: 13px; color: var(--ink-2); padding-top: 20px; }
.heat-block { display: flex; flex-direction: column; gap: 4px; }
.heat-axis { display: grid; grid-template-columns: repeat(8, 28px); gap: 3px; font-family: var(--mono); font-size: 9px; color: var(--ink-4); }
.heat-axis span { text-align: center; }
.heat { display: grid; grid-template-columns: repeat(8, 28px); gap: 3px; }
.heat-cell {
  width: 28px; height: 28px;
  display: grid; place-items: center;
  font-family: var(--mono);
  font-size: 10px;
  border: 1px solid var(--rule-soft);
  cursor: default;
  transition: transform .12s;
}
.heat-cell:hover { transform: scale(1.14); z-index: 3; position: relative; }
.heat-meta { font-family: var(--mono); font-size: 12px; color: var(--ink-3); padding-top: 20px; }

.avalanche-stats { display: flex; gap: 0; flex-wrap: wrap; margin: 26px 0; border: 1px solid var(--rule); }
.stat { flex: 1 1 150px; padding: 14px 18px; border-right: 1px solid var(--rule); }
.stat:last-child { border-right: 0; }
.stat-label { display: block; font-size: 11.5px; color: var(--ink-3); }
.stat-value { display: block; font-family: var(--mono); font-size: 20px; color: var(--ink); margin-top: 4px; }

.diffusion-chart {
  display: flex; align-items: flex-end; gap: 5px;
  height: 140px; padding: 0 2px;
  border-bottom: 1px solid var(--ink);
}
.diffusion-bar {
  flex: 1;
  background: var(--federal);
  opacity: .78;
  position: relative;
  min-height: 2px;
  transition: height .3s ease-out;
}
.diffusion-bar span {
  position: absolute; top: -18px; left: 50%; transform: translateX(-50%);
  font-family: var(--mono); font-size: 9px; color: var(--ink-3);
}
.diffusion-axis { display: flex; gap: 5px; padding: 6px 2px 0; }
.diffusion-axis span { flex: 1; text-align: center; font-family: var(--mono); font-size: 9px; color: var(--ink-4); }

.cmp-table { width: 100%; border-collapse: collapse; font-size: 13px; margin-top: 8px; table-layout: fixed; }
.cmp-table th, .cmp-table td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--rule-soft); }
.cmp-table th { font-size: 11.5px; font-weight: 600; color: var(--ink-3); }
.cmp-table th:nth-child(1) { width: 34%; }
.cmp-table th:nth-child(2) { width: 30%; }
.cmp-table td.mono { font-family: var(--mono); font-size: 12px; letter-spacing: .04em; word-break: break-all; }
.cmp-table tr.hi td { background: #f2f5fa; }
.cmp-scroll { overflow-x: auto; }

.verdict { margin-top: 20px; padding: 16px 18px; font-size: 14px; line-height: 1.8; border-left: 3px solid; }
.verdict.ok { border-color: var(--machine); background: #f0f7f2; color: #1e4d33; }
.verdict.bad { border-color: var(--stamp); background: #faf1f0; color: #7a221d; }
.verdict .sub { display: block; margin-top: 6px; font-size: 12.5px; color: var(--ink-3); }

.bits-inline { display: flex; flex-wrap: wrap; gap: 1px; font-family: var(--mono); font-size: 11px; }
.bits-inline i { font-style: normal; width: 12px; text-align: center; color: var(--ink-4); }
.bits-inline i.one { color: var(--ink); font-weight: 700; }
.bits-inline i.diff { box-shadow: inset 0 -2px 0 var(--stamp); }

.rt-flow { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.rt-box { border: 1px solid var(--rule); padding: 12px 16px; min-width: 200px; background: var(--surface); }
.rt-box .lab { display: block; font-size: 11.5px; color: var(--ink-3); }
.rt-box .val { display: block; font-family: var(--mono); font-size: 14px; margin-top: 5px; }
.rt-arrow { font-size: 20px; color: var(--ink-4); }
.rt-op { font-size: 11px; color: var(--ink-3); text-align: center; line-height: 1.5; }

/* ====================================================== 5 核对 === */

.progress { height: 3px; background: var(--rule); margin: 22px 0 20px; overflow: hidden; }
.progress-bar { height: 100%; width: 0; background: var(--federal); transition: width .12s linear; }

.verify-out { display: flex; flex-direction: column; gap: 8px; }
.vrow { display: flex; gap: 12px; align-items: baseline; font-size: 13.5px; line-height: 1.7; }
.vrow .mark { flex: none; width: 14px; font-family: var(--mono); }
.vrow .mark.ok { color: var(--machine); }
.vrow .mark.bad { color: var(--stamp); }
.vrow .mark.run { color: var(--ink-4); }
.vrow .txt { color: var(--ink-2); }
.vrow.final { margin-top: 12px; padding-top: 14px; border-top: 1px solid var(--rule); }
.vrow.final.ok .txt { color: var(--machine); font-weight: 600; }
.vrow.final.bad .txt { color: var(--stamp); font-weight: 600; }

pre {
  margin: 14px 0 0;
  padding: 16px 18px;
  border: 1px solid var(--rule);
  background: #fbfbf9;
  font-size: 12px;
  line-height: 1.85;
  color: var(--ink-2);
  overflow-x: auto;
}

.glossary { margin: 18px 0 0; max-width: 44em; }
.glossary dt {
  font-weight: 600;
  font-size: 13.5px;
  color: var(--ink);
  margin-top: 14px;
}
.glossary dd {
  margin: 4px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ink-2);
}

.colophon {
  margin-top: 72px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--ink-3);
}
.colophon code { color: var(--ink-2); font-size: 11.5px; }

/* ====================================================== 自适应 === */

@media (max-width: 760px) {
  .masthead { padding: 40px 20px 30px; }
  main { padding: 0 20px 64px; }
  .chapter { padding-left: 0; }
  .chapter > h2 .num {
    position: static;
    display: block;
    width: auto;
    text-align: left;
    font-size: 15px;
    color: var(--ink-4);
    margin-bottom: 4px;
  }
  .result-row { grid-template-columns: 1fr; gap: 18px; }
  .result-arrow { flex-direction: row; gap: 8px; }
  .result-arrow svg { transform: rotate(90deg); }
  .result-figure { padding: 22px 18px 16px; }
  .stage-figure { padding: 18px 14px 14px; }
  .stage-bar { gap: 12px; padding: 10px 12px; }
  .scrub-wrap { flex-basis: 100%; }
  .ks-head, .ks-row { grid-template-columns: 34px 62px minmax(0,1fr); gap: 8px; padding: 6px 10px; }
  .bit { width: 15px; height: 26px; font-size: 10px; }
  .bit .idx { font-size: 6.5px; }
  .bits { gap: 8px; }

  /* 热力图改成流式，避免在窄屏上溢出 */
  .heat-title, .heat-meta { padding-top: 0; min-width: 0; }
  .heat-block { flex: 1 1 200px; min-width: 0; }
  .heat, .heat-axis { grid-template-columns: repeat(8, minmax(0, 1fr)); }
  .heat-cell { width: auto; height: auto; aspect-ratio: 1; font-size: 8.5px; }

  .rt-box { min-width: 0; flex: 1 1 150px; }
  .stat { flex: 1 1 45%; padding: 12px 14px; }
  .glossary, .chapter-lede, .stage-plain, .stage-plain + * { max-width: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}