/* =========================================================
   mibo-game.com.cn — 共享样式表 /assets/site.css
   夜间数据台 · 纵向长卷 · 维度轨道导航
   ========================================================= */

/* ---------- 1. 变量 ---------- */
:root {
  --ink: #0B1512;
  --pitch: #12241E;
  --moss: #1B3A31;
  --cyan: #47F0D0;
  --cyan-soft: #A8F5E6;
  --orange: #FF8A3D;
  --rose: #FF4D7E;
  --paper: #F2EDE3;
  --seal: #C6402F;
  --rule: #6E8580;

  --text: #E2EFEA;
  --text-dim: #9AB1AA;
  --paper-text: #17251F;
  --paper-dim: #46594F;

  --font-sans: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "SimSun", Georgia, "Times New Roman", serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;

  --rail-w: 264px;
  --railh: 64px;
  --read: 1080px;

  --ease: cubic-bezier(.22, .61, .36, 1);
  --dur: .18s;
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd, ul, ol { margin: 0; }

ul, ol { padding: 0; list-style: none; }

img, svg, video { display: block; max-width: 100%; height: auto; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

a { color: inherit; text-decoration: none; }

table { border-collapse: collapse; width: 100%; }

hr { border: 0; }

/* ---------- 3. 中文排版与基底 ---------- */
body {
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--ink);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: -.008em;
}

strong, b { font-weight: 700; }

code, kbd, samp, .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

main { display: block; }

::selection {
  background: var(--cyan);
  color: var(--ink);
}

/* ---------- 4. 焦点与可见性 ---------- */
:focus { outline: none; }

a:focus-visible,
button:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 2px;
}

.band--paper a:focus-visible,
.band--paper button:focus-visible,
.foot a:focus-visible { outline-color: var(--seal); }

.foot a:focus-visible { outline-color: var(--cyan); }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 5. 布局骨架：轨道轨道占位 ---------- */
@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }
  html { scroll-padding-top: 28px; }
}

@media (max-width: 1023px) {
  body { padding-top: var(--railh); }
}

/* ---------- 6. Skip link ---------- */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 300;
  padding: 11px 18px;
  background: var(--cyan);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  transform: translateY(-200%);
  transition: transform var(--dur) var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
  outline-offset: 2px;
}

/* ---------- 7. 维度轨道（Header） ---------- */
.rail {
  position: fixed;
  z-index: 120;
  top: 0;
  left: 0;
  width: var(--rail-w);
  height: 100vh;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  background-color: var(--ink);
  background-image: repeating-linear-gradient(
    0deg,
    rgba(71, 240, 208, .05) 0 1px,
    rgba(71, 240, 208, 0) 1px 6px
  );
  border-right: 1px solid var(--moss);
  overflow-y: auto;
}

.rail__inner {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-height: 100%;
  padding: 30px 22px 28px 24px;
}

/* 品牌 */
.brand {
  display: block;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--moss);
}

.brand__mark {
  display: block;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .28em;
  color: var(--cyan);
  text-transform: uppercase;
}

.brand__name {
  display: block;
  margin-top: 8px;
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: .01em;
  color: var(--paper);
}

.brand__tag {
  display: block;
  margin-top: 7px;
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--rule);
}

/* 移动导航按钮 */
.rail__toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 13px;
  border: 1px solid var(--moss);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.rail__toggle:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

.rail__toggle-bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: background-color var(--dur) var(--ease);
}

.rail__toggle-bars::before,
.rail__toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease);
}

.rail__toggle-bars::before { top: -5px; }
.rail__toggle-bars::after { top: 5px; }

.rail__toggle[aria-expanded="true"] .rail__toggle-bars { background: transparent; }
.rail__toggle[aria-expanded="true"] .rail__toggle-bars::before { transform: translateY(5px) rotate(45deg); }
.rail__toggle[aria-expanded="true"] .rail__toggle-bars::after { transform: translateY(-5px) rotate(-45deg); }

.rail__toggle-text { white-space: nowrap; }

/* 导航 */
.nav__label {
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .24em;
  color: var(--rule);
}

.nav__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 9px 10px 9px 14px;
  font-size: 15px;
  color: #C9DED7;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.nav__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 3px;
  height: 0;
  background: var(--cyan);
  transform: translateY(-50%);
  transition: height var(--dur) var(--ease);
}

.nav__link:hover {
  color: var(--cyan);
  background-color: var(--pitch);
}

.nav__link:hover::before { height: 58%; }

.nav__link[aria-current="page"] {
  color: var(--cyan);
  background-color: var(--moss);
}

.nav__link[aria-current="page"]::before { height: 100%; }

.nav__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--rule);
  transition: color var(--dur) var(--ease);
}

.nav__link:hover .nav__num,
.nav__link[aria-current="page"] .nav__num { color: var(--cyan-soft); }

.nav__text { flex: 1 1 auto; }

/* 轨道 CTA */
.rail__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px 16px;
  border: 1px solid var(--cyan);
  color: var(--cyan);
  font-size: 14px;
  letter-spacing: .06em;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.rail__cta::after {
  content: "→";
  font-family: var(--font-mono);
  transition: transform var(--dur) var(--ease);
}

.rail__cta:hover {
  background-color: var(--cyan);
  color: var(--ink);
}

.rail__cta:hover::after { transform: translateX(4px); }

/* 轨道元信息 */
.rail__meta {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px dashed var(--moss);
  display: flex;
  flex-direction: column;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.7;
  letter-spacing: .06em;
  color: var(--rule);
}

.rail__meta-row { display: block; }
.rail__meta b { color: var(--cyan-soft); font-weight: 500; }

/* ---------- 8. 移动端：横栏 + 抽屉 ---------- */
@media (max-width: 1023px) {
  .rail {
    width: 100%;
    height: var(--railh);
    flex-direction: row;
    align-items: center;
    border-right: 0;
    border-bottom: 1px solid var(--moss);
    background-color: rgba(11, 21, 18, .95);
    background-image: none;
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    overflow: visible;
  }

  .rail__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    width: 100%;
    min-height: 0;
    padding: 0 16px;
  }

  .brand {
    flex: 1 1 auto;
    min-width: 0;
    padding: 0;
    border-bottom: 0;
  }

  .brand__mark,
  .brand__tag { display: none; }

  .brand__name {
    display: block;
    margin: 0;
    font-size: 17px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .rail__cta,
  .rail__meta { display: none; }

  .rail__toggle { display: inline-flex; flex: 0 0 auto; }

  .nav {
    position: fixed;
    top: var(--railh);
    left: 0;
    right: 0;
    max-height: calc(100vh - var(--railh));
    max-height: calc(100dvh - var(--railh));
    overflow-y: auto;
    padding: 18px 16px 28px;
    background-color: var(--pitch);
    border-top: 1px solid var(--moss);
    border-bottom: 2px solid var(--cyan);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur) linear;
  }

  .nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav__label { margin-bottom: 12px; }

  .nav__list { gap: 4px; }

  .nav__link {
    padding: 13px 14px 13px 18px;
    font-size: 16px;
    border-bottom: 1px solid rgba(27, 58, 49, .7);
  }

  .nav__link[aria-current="page"] { border-bottom-color: var(--moss); }
}

/* ---------- 9. 页脚 ---------- */
.foot {
  position: relative;
  background-color: var(--pitch);
  border-top: 1px solid var(--moss);
  color: var(--text-dim);
  overflow: hidden;
}

.foot::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), rgba(71, 240, 208, 0) 72%);
}

.foot__scan {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    0deg,
    rgba(71, 240, 208, .035) 0 1px,
    rgba(71, 240, 208, 0) 1px 6px
  );
}

.foot__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 2fr);
  gap: clamp(28px, 4vw, 64px);
  padding-top: clamp(44px, 6vw, 72px);
  padding-bottom: 36px;
}

.foot__mark {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--cyan);
}

.foot__name {
  margin-top: 9px;
  font-family: var(--font-serif);
  font-size: 23px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--paper);
}

.foot__note {
  margin-top: 10px;
  max-width: 34ch;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--text-dim);
}

.foot__cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
}

.foot__col-title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 400;
  letter-spacing: .2em;
  color: var(--cyan-soft);
}

.foot__col ul {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.foot__col a {
  position: relative;
  display: inline-block;
  font-size: 14.5px;
  color: var(--text-dim);
  transition: color var(--dur) var(--ease);
}

.foot__col a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}

.foot__col a:hover { color: var(--paper); }
.foot__col a:hover::after { transform: scaleX(1); }

.foot__base {
  position: relative;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 8px 28px;
  padding-top: 24px;
  padding-bottom: 38px;
  border-top: 1px solid var(--moss);
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--rule);
}

.foot__contact {
  font-family: var(--font-mono);
  letter-spacing: .01em;
  color: var(--text-dim);
  word-break: break-word;
}

.foot__addr { color: var(--rule); }

.foot__legal {
  font-family: var(--font-mono);
  letter-spacing: .04em;
  color: var(--rule);
}

.foot__foot {
  grid-column: 1 / -1;
  max-width: 68ch;
  color: var(--rule);
}

/* ---------- 10. 容器与分区色带 ---------- */
.wrap {
  width: 100%;
  max-width: var(--read);
  margin-inline: auto;
  padding-inline: clamp(18px, 4vw, 40px);
}

.band {
  position: relative;
  padding-block: clamp(48px, 7vw, 96px);
}

.band--ink { background-color: var(--ink); color: var(--text); }
.band--pitch { background-color: var(--pitch); color: var(--text); }
.band--moss { background-color: var(--moss); color: var(--text); }

.band--paper {
  background-color: var(--paper);
  color: var(--paper-text);
}

.band--paper h1,
.band--paper h2,
.band--paper h3 { color: var(--paper-text); }

.rule {
  height: 1px;
  background-color: var(--moss);
  border: 0;
  margin: 0;
}

/* ---------- 11. 章节抬头组 ---------- */
.section-head {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: clamp(24px, 3.4vw, 42px);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--cyan);
}

.band--paper .eyebrow { color: var(--seal); }

.display {
  font-family: var(--font-serif);
  font-size: clamp(30px, 4.4vw, 52px);
  font-weight: 700;
  line-height: 1.16;
  letter-spacing: -.015em;
}

.lede {
  max-width: 64ch;
  font-size: clamp(16px, 1.3vw, 18.5px);
  line-height: 1.85;
  color: var(--text-dim);
}

.band--paper .lede { color: var(--paper-dim); }

/* ---------- 12. 指标块 ---------- */
.metric {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.metric__value {
  font-family: var(--font-mono);
  font-size: clamp(34px, 5vw, 62px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -.02em;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.band--paper .metric__value { color: var(--seal); }

.metric__unit {
  margin-left: 6px;
  font-size: .34em;
  letter-spacing: .04em;
  color: var(--cyan-soft);
}

.band--paper .metric__unit { color: var(--seal); }

.metric__label {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--rule);
}

/* ---------- 13. 网格与卡片 ---------- */
.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}

.grid--2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(228px, 1fr)); }

.card {
  position: relative;
  padding: 24px 22px 26px;
  background-color: var(--pitch);
  border: 1px solid var(--moss);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.card:hover {
  border-color: var(--cyan);
  background-color: var(--moss);
}

.band--paper .card {
  background-color: #FFFFFF;
  border-color: #DAD3C6;
}

.band--paper .card:hover {
  border-color: var(--seal);
  background-color: #FFFFFF;
}

.card__index {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--rule);
}

.card__title {
  margin-top: 12px;
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.35;
}

.card__text {
  margin-top: 9px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text-dim);
}

.band--paper .card__text { color: var(--paper-dim); }

/* ---------- 14. 固定维度卡片（可折叠） ---------- */
.dim {
  border: 1px solid var(--moss);
  background-color: var(--pitch);
  transition: border-color var(--dur) var(--ease);
}

.dim:hover { border-color: var(--cyan); }
.dim[data-open] { border-color: var(--cyan); }

.dim__head {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 18px 20px;
  text-align: left;
}

.dim__index {
  flex: 0 0 auto;
  padding: 4px 8px;
  background-color: var(--moss);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--cyan-soft);
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.dim__head:hover .dim__index {
  transform: translateX(3px);
  background-color: var(--cyan);
  color: var(--ink);
}

.dim__title {
  flex: 1 1 auto;
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
}

.dim__sign {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--cyan);
  transition: transform var(--dur) var(--ease);
}

.dim[data-open] .dim__sign { transform: rotate(45deg); }

.dim__body {
  max-height: 0;
  overflow: hidden;
  padding: 0 20px;
  transition: max-height var(--dur) var(--ease), padding var(--dur) var(--ease);
}

.dim[data-open] .dim__body {
  max-height: 460px;
  padding: 0 20px 20px;
}

.dim__text {
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--text-dim);
}

/* ---------- 15. 图例 ---------- */
.legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--text-dim);
}

.legend__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 2px 0;
  border: 0;
  background: none;
  transition: color var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.legend__item:hover { color: var(--paper); }
.legend__item[data-muted="true"] { opacity: .35; }

.legend__swatch {
  flex: 0 0 auto;
  width: 13px;
  height: 13px;
  border: 1px solid rgba(242, 237, 227, .18);
}

.legend__swatch--cyan { background-color: var(--cyan); }
.legend__swatch--orange { background-color: var(--orange); }
.legend__swatch--rose { background-color: var(--rose); }

.legend__label { white-space: nowrap; }

/* ---------- 16. 图片容器基础规则 ---------- */
.figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  background-color: var(--pitch);
  border: 1px solid var(--moss);
}

.figure > img,
.figure > svg,
.figure > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.7) contrast(1.06) brightness(.94);
}

.figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    0deg,
    rgba(11, 21, 18, .2) 0 1px,
    rgba(11, 21, 18, 0) 1px 4px
  );
}

.figure--tint::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(155deg, rgba(18, 36, 30, .62), rgba(11, 21, 18, .12) 70%);
}

.figure__cap {
  position: relative;
  z-index: 2;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--rule);
}

.ratio-16x9 { aspect-ratio: 16 / 9; }
.ratio-4x3 { aspect-ratio: 4 / 3; }
.ratio-3x2 { aspect-ratio: 3 / 2; }
.ratio-1x1 { aspect-ratio: 1 / 1; }

/* ---------- 17. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  border: 1px solid var(--moss);
  font-size: 15px;
  letter-spacing: .05em;
  color: var(--text);
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.btn--solid {
  background-color: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

.btn--solid:hover { background-color: var(--cyan-soft); border-color: var(--cyan-soft); }

.btn--ghost {
  border-color: var(--cyan);
  color: var(--cyan);
}

.btn--ghost:hover { background-color: var(--cyan); color: var(--ink); }

.btn--quiet {
  border-color: transparent;
  color: var(--text-dim);
  padding-inline: 0;
}

.btn--quiet::after {
  content: "→";
  font-family: var(--font-mono);
  transition: transform var(--dur) var(--ease);
}

.btn--quiet:hover { color: var(--cyan); }
.btn--quiet:hover::after { transform: translateX(5px); }

/* ---------- 18. 面包屑 ---------- */
.crumbs {
  margin-bottom: 24px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--rule);
}

.crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.crumbs li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.crumbs li + li::before {
  content: "/";
  color: var(--moss);
}

.crumbs a {
  color: var(--text-dim);
  transition: color var(--dur) var(--ease);
}

.crumbs a:hover { color: var(--cyan); }

.crumbs [aria-current] { color: var(--paper); }

.band--paper .crumbs { color: var(--paper-dim); }
.band--paper .crumbs a { color: var(--paper-dim); }
.band--paper .crumbs [aria-current] { color: var(--paper-text); }

/* ---------- 19. 长文排版 ---------- */
.prose {
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.85;
}

.prose > * + * { margin-top: 1.15em; }

.prose h2 {
  margin-top: 2.4em;
  font-size: clamp(22px, 2.4vw, 30px);
}

.prose h3 {
  margin-top: 1.9em;
  font-size: clamp(18px, 1.8vw, 22px);
}

.prose ul,
.prose ol {
  padding-left: 0;
  display: flex;
  flex-direction: column;
  gap: .5em;
}

.prose li {
  position: relative;
  padding-left: 1.4em;
}

.prose li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--rule);
}

.prose a {
  color: var(--cyan);
  border-bottom: 1px solid rgba(71, 240, 208, .38);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.prose a:hover { border-bottom-color: var(--cyan); }

.prose blockquote {
  padding-left: 18px;
  border-left: 2px solid var(--cyan);
  color: var(--text-dim);
}

.band--paper .prose { color: var(--paper-text); }
.band--paper .prose a { color: var(--seal); border-bottom-color: rgba(198, 64, 47, .4); }
.band--paper .prose a:hover { border-bottom-color: var(--seal); }
.band--paper .prose li::before { color: var(--paper-dim); }
.band--paper .prose blockquote { border-left-color: var(--seal); color: var(--paper-dim); }

/* ---------- 20. 章节锚点条 ---------- */
.chapter-bar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  gap: 4px;
  overflow-x: auto;
  padding: 10px 0;
  background-color: rgba(11, 21, 18, .93);
  border-bottom: 1px solid var(--moss);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  scrollbar-width: thin;
}

.chapter-bar__link {
  flex: 0 0 auto;
  padding: 6px 13px;
  border: 1px solid transparent;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--text-dim);
  white-space: nowrap;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.chapter-bar__link:hover {
  color: var(--cyan);
  border-color: var(--moss);
}

.chapter-bar__link[aria-current] {
  background-color: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

@media (max-width: 1023px) {
  .chapter-bar { top: var(--railh); }
}

/* ---------- 21. 标记 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--moss);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--text-dim);
}

.tag--cyan { border-color: var(--cyan); color: var(--cyan); }
.tag--orange { border-color: var(--orange); color: var(--orange); }
.tag--rose { border-color: var(--rose); color: var(--rose); }

.band--paper .tag { border-color: #D6CFC2; color: var(--paper-dim); }
.band--paper .tag--cyan { border-color: #1E9E86; color: #17695B; }
.band--paper .tag--orange { border-color: var(--orange); color: #A8521C; }
.band--paper .tag--rose { border-color: var(--rose); color: #A62B51; }

/* ---------- 22. 响应式收敛 ---------- */
@media (max-width: 860px) {
  .foot__inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }

  .foot__cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px;
  }
}

@media (max-width: 480px) {
  body { font-size: 16px; }

  .foot__cols { grid-template-columns: minmax(0, 1fr); }

  .grid--2,
  .grid--3 { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 23. 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
}