/* ========== 01. Reset ========== */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:100px;}
body,h1,h2,h3,h4,p,ul,ol,li,figure,figcaption,blockquote,dl,dd{margin:0;}
ul,ol{padding:0;list-style:none;}
img,svg,video{display:block;max-width:100%;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
a{color:inherit;text-decoration:none;}
table{border-collapse:collapse;}
::selection{background:var(--amber);color:var(--ink);}

/* ========== 02. Tokens ========== */
:root{
  --ink:#12263A;
  --sand:#D9773F;
  --sand-deep:#A84E22;
  --celadon:#5C8A78;
  --celadon-deep:#3F6A59;
  --cream:#F5EEDF;
  --paper:#FFFDF7;
  --brown:#241A14;
  --brown-soft:#3B2E26;
  --slate:#6B7B88;
  --slate-deep:#4F5F6B;
  --sand-light:#E8D3B8;
  --amber:#F2A365;
  --line:#2B3A45;
  --max:1280px;
  --narrow:74ch;
  --font-head:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Serif SC","Songti SC","STSong","SimSun",serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono","SFMono-Regular",Consolas,monospace;
  --shadow-hard:8px 8px 0 0 rgba(43,58,69,.16);
  --shadow-soft:0 10px 30px -18px rgba(18,38,58,.55);
  --r:2px;
}

/* ========== 03. 中文排版基调 ========== */
body{
  background-color:var(--cream);
  background-image:linear-gradient(180deg,rgba(232,211,184,.42),rgba(245,238,223,0) 340px);
  background-repeat:no-repeat;
  color:var(--brown);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.8;
  letter-spacing:.01em;
  text-rendering:optimizeLegibility;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-family:var(--font-head);color:var(--ink);letter-spacing:.01em;}
:focus-visible{outline:3px solid var(--sand-deep);outline-offset:3px;border-radius:var(--r);}
.bc-header :focus-visible,.bc-footer :focus-visible{outline-color:var(--amber);outline-offset:2px;}
.bc-sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;}
.bc-mono{font-family:var(--font-mono);letter-spacing:.05em;}
.bc-dot{display:inline-block;flex:none;width:8px;height:8px;border-radius:50%;background:var(--celadon);box-shadow:0 0 0 3px rgba(92,138,120,.22);}

/* ========== 04. Skip link ========== */
.bc-skip{
  position:fixed;left:14px;top:-140px;z-index:200;
  padding:11px 18px;background:var(--amber);color:var(--ink);
  font-family:var(--font-head);font-weight:700;font-size:14px;letter-spacing:.04em;
  border:2px solid var(--ink);box-shadow:4px 4px 0 0 rgba(18,38,58,.6);
  transition:top .18s ease-out;
}
.bc-skip:focus{top:14px;}

/* ========== 05. Header ========== */
.bc-header{
  position:sticky;top:0;z-index:80;
  background:var(--ink);color:var(--paper);
  border-bottom:3px solid var(--sand);
  box-shadow:0 3px 0 0 rgba(43,58,69,.28);
}
.bc-header__inner{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;
  gap:14px 22px;
  padding-block:11px;
}
.bc-brand{display:flex;align-items:center;gap:11px;min-height:44px;min-width:0;}
.bc-brand__mark{
  display:grid;place-items:center;flex:none;
  width:42px;height:42px;
  background:var(--sand);color:var(--ink);
  font-family:var(--font-head);font-weight:800;font-size:20px;line-height:1;
  border:2px solid var(--amber);
  box-shadow:3px 3px 0 0 rgba(0,0,0,.38);
}
.bc-brand__text{display:flex;flex-direction:column;gap:2px;min-width:0;}
.bc-brand__name{font-family:var(--font-head);font-weight:700;font-size:17px;line-height:1.2;letter-spacing:.08em;color:var(--paper);}
.bc-brand__line{font-family:var(--font-mono);font-size:10.5px;line-height:1.4;letter-spacing:.16em;color:rgba(245,238,223,.66);white-space:nowrap;}

.bc-nav{display:block;min-width:0;}
.bc-nav__list{display:flex;align-items:center;flex-wrap:wrap;gap:2px;}
.bc-nav__item{display:block;min-width:0;}
.bc-nav__link{
  position:relative;display:inline-flex;align-items:baseline;gap:6px;
  padding:9px 11px;border-radius:var(--r);
  font-family:var(--font-head);font-size:14.5px;font-weight:500;letter-spacing:.03em;
  color:rgba(245,238,223,.86);
  transition:background-color .18s ease,color .18s ease,box-shadow .18s ease;
}
.bc-nav__link:hover{background:rgba(242,163,101,.14);color:var(--paper);}
.bc-nav__link[aria-current="page"]{
  color:var(--amber);
  background:rgba(242,163,101,.12);
  box-shadow:inset 0 -3px 0 0 var(--sand);
}
.bc-nav__index{font-family:var(--font-mono);font-size:10.5px;line-height:1;letter-spacing:.1em;color:var(--sand);}
.bc-nav__link[aria-current="page"] .bc-nav__index{color:var(--amber);}
.bc-nav__meta{display:none;}

.bc-header__actions{display:flex;align-items:center;gap:10px;justify-self:end;}
.bc-version{
  font-family:var(--font-mono);font-size:11.5px;line-height:1;letter-spacing:.08em;
  color:var(--amber);padding:6px 9px;white-space:nowrap;
  border:1px solid rgba(242,163,101,.55);border-radius:var(--r);
}
.bc-query{
  display:inline-flex;align-items:center;gap:7px;
  padding:9px 14px;white-space:nowrap;
  font-family:var(--font-head);font-size:13.5px;font-weight:600;letter-spacing:.05em;
  color:var(--ink);background:var(--sand);
  border:2px solid var(--sand-deep);
  box-shadow:3px 3px 0 0 rgba(0,0,0,.34);
  transition:transform .16s ease,box-shadow .16s ease,background-color .16s ease;
}
.bc-query::before{content:"›";font-family:var(--font-mono);font-size:15px;line-height:.9;color:var(--sand-deep);}
.bc-query:hover{background:var(--amber);transform:translate(-1px,-1px);box-shadow:4px 4px 0 0 rgba(0,0,0,.4);}
.bc-nav-toggle{
  display:none;align-items:center;gap:9px;
  min-height:44px;padding:8px 12px;
  border:2px solid rgba(245,238,223,.45);border-radius:var(--r);
  color:var(--paper);
  transition:border-color .16s ease,color .16s ease;
}
.bc-nav-toggle:hover{border-color:var(--amber);color:var(--amber);}
.bc-nav-toggle__bar{display:block;width:18px;height:2px;background:currentColor;box-shadow:0 -6px 0 currentColor,0 6px 0 currentColor;transition:transform .18s ease,box-shadow .18s ease;}
.bc-nav-toggle__text{font-family:var(--font-head);font-size:12.5px;letter-spacing:.14em;}
.bc-nav-toggle[aria-expanded="true"]{border-color:var(--amber);color:var(--amber);}

.bc-progress{height:3px;background:rgba(245,238,223,.14);overflow:hidden;}
.bc-progress__bar{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--sand),var(--amber));transition:width .1s linear;}

@media (max-width:1120px){
  .bc-nav__link{padding:8px 8px;font-size:13.5px;gap:4px;}
  .bc-query{padding:8px 11px;font-size:12.5px;}
  .bc-version{font-size:10.5px;padding:5px 7px;}
}
@media (max-width:960px){
  .bc-header__inner{grid-template-columns:minmax(0,1fr) auto;gap:8px 12px;padding-block:10px;}
  .bc-brand__line{font-size:10px;letter-spacing:.1em;}
  .bc-header__actions{justify-self:end;gap:8px;}
  .bc-version,.bc-query{display:none;}
  .bc-nav-toggle{display:inline-flex;}
  .bc-nav{grid-column:1 / -1;display:none;}
  .bc-nav[data-open],.bc-nav[data-open="true"]{display:block;}
  .bc-nav__list{
    flex-direction:column;flex-wrap:nowrap;align-items:stretch;gap:0;
    padding-block:6px 8px;border-top:1px solid rgba(245,238,223,.18);
  }
  .bc-nav__link{
    display:flex;align-items:center;justify-content:space-between;
    padding:13px 6px;font-size:16px;
    border-bottom:1px solid rgba(245,238,223,.12);
  }
  .bc-nav__link[aria-current="page"]{box-shadow:inset 3px 0 0 0 var(--sand);}
  .bc-nav__meta{
    display:block;padding:11px 6px 4px;
    font-family:var(--font-mono);font-size:11.5px;line-height:1.6;letter-spacing:.04em;
    color:rgba(245,238,223,.62);
  }
}
@media (max-width:400px){
  .bc-brand__mark{width:38px;height:38px;font-size:18px;}
  .bc-brand__name{font-size:15.5px;}
}

/* ========== 06. Footer ========== */
.bc-footer{
  margin-top:clamp(48px,8vw,96px);
  background:var(--ink);color:var(--cream);
  border-top:6px solid var(--sand);
}
.bc-footer__band{background:var(--sand-light);color:var(--ink);border-bottom:3px solid var(--line);}
.bc-footer__band-inner{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px 26px;
  padding-block:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;line-height:1.6;
}
.bc-footer__band-item{display:inline-flex;align-items:center;gap:8px;}
.bc-footer__inner{
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,1.35fr);
  gap:clamp(28px,5vw,72px);
  padding-block:clamp(34px,5vw,60px);
}
.bc-footer__brand{max-width:48ch;min-width:0;}
.bc-footer__name{
  font-family:var(--font-head);font-weight:800;
  font-size:clamp(22px,3vw,30px);line-height:1.2;letter-spacing:.06em;
  color:var(--paper);margin-bottom:12px;
}
.bc-footer__summary{font-size:15px;line-height:1.85;color:rgba(245,238,223,.8);}
.bc-footer__status{
  display:flex;align-items:center;gap:8px;margin-top:16px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;line-height:1.6;
  color:rgba(245,238,223,.72);
}
.bc-footer__export{
  margin-top:14px;padding-left:11px;
  border-left:3px solid var(--sand);
  font-family:var(--font-mono);font-size:12px;line-height:1.7;letter-spacing:.03em;
  color:var(--sand-light);
}
.bc-footer__cols{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1.3fr);
  gap:clamp(22px,4vw,44px);
  min-width:0;
}
.bc-footer__col{min-width:0;}
.bc-footer__heading{
  font-family:var(--font-head);font-size:12px;font-weight:700;letter-spacing:.2em;
  color:var(--amber);margin-bottom:14px;padding-bottom:8px;
  border-bottom:1px solid rgba(245,238,223,.2);
}
.bc-footer__links{display:grid;gap:2px;}
.bc-footer__link{
  display:inline-flex;align-items:center;gap:9px;padding:7px 0;
  font-size:14.5px;line-height:1.6;color:rgba(245,238,223,.86);
  transition:color .16s ease,transform .16s ease;
}
.bc-footer__link::before{
  content:"";flex:none;width:6px;height:6px;
  border:1px solid var(--sand);
  transition:background-color .16s ease;
}
.bc-footer__link:hover{color:var(--paper);transform:translateX(3px);}
.bc-footer__link:hover::before{background:var(--amber);}
.bc-footer__contact{display:grid;gap:10px;}
.bc-contact-line{
  display:grid;grid-template-columns:44px minmax(0,1fr);gap:10px;align-items:baseline;
  font-size:14px;line-height:1.7;
}
.bc-contact-line__key{font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--sand);}
.bc-contact-line__val{color:var(--paper);word-break:break-word;}
.bc-footer__note{margin-top:14px;font-size:12.5px;line-height:1.75;color:rgba(245,238,223,.62);}
.bc-footer__cta{
  display:inline-flex;align-items:center;margin-top:16px;padding:9px 16px;
  font-family:var(--font-head);font-size:13.5px;font-weight:600;letter-spacing:.05em;
  color:var(--ink);background:var(--amber);
  border:2px solid var(--sand-deep);
  box-shadow:3px 3px 0 0 rgba(0,0,0,.36);
  transition:transform .16s ease,box-shadow .16s ease,background-color .16s ease;
}
.bc-footer__cta:hover{background:var(--sand);transform:translate(-1px,-1px);box-shadow:4px 4px 0 0 rgba(0,0,0,.42);}
.bc-footer__legal{border-top:1px solid rgba(245,238,223,.18);background:rgba(0,0,0,.16);}
.bc-footer__legal-inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 24px;
  padding-block:16px;
  font-size:12.5px;line-height:1.7;color:rgba(245,238,223,.66);
}
.bc-footer__legal-links{display:flex;flex-wrap:wrap;gap:6px 18px;}
.bc-footer__legal-link{
  font-family:var(--font-head);font-size:12.5px;letter-spacing:.04em;
  color:rgba(245,238,223,.74);
  padding-bottom:1px;border-bottom:1px solid transparent;
  transition:color .16s ease,border-color .16s ease;
}
.bc-footer__legal-link:hover{color:var(--amber);border-bottom-color:var(--amber);}
.bc-footer__meta{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.04em;color:rgba(245,238,223,.6);}
@media (max-width:860px){
  .bc-footer__inner{grid-template-columns:1fr;gap:32px;}
  .bc-footer__cols{grid-template-columns:1fr;gap:28px;}
  .bc-footer__brand{max-width:none;}
}
@media (max-width:520px){
  .bc-footer__band-inner{flex-direction:column;align-items:flex-start;gap:5px;}
  .bc-footer__legal-inner{flex-direction:column;align-items:flex-start;gap:10px;}
  .bc-contact-line{grid-template-columns:38px minmax(0,1fr);}
}

/* ========== 07. 布局与章节 ========== */
.bc-wrap{width:100%;max-width:var(--max);margin-inline:auto;padding-inline:clamp(16px,4vw,40px);}
.bc-section{padding-block:clamp(40px,7vw,84px);}
.bc-section--tint{background:var(--sand-light);border-block:2px solid var(--line);}
.bc-section--paper{background:var(--paper);border-block:2px solid var(--line);}
.bc-section--ink{background:var(--ink);color:var(--cream);border-block:2px solid var(--line);}
.bc-section__head{max-width:58ch;margin-bottom:clamp(20px,3vw,34px);}
.bc-kicker{
  display:flex;align-items:center;gap:10px;margin-bottom:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;line-height:1.5;
  color:var(--sand-deep);
}
.bc-kicker::before{content:"";width:22px;height:2px;background:var(--sand);flex:none;}
.bc-section--ink .bc-kicker{color:var(--amber);}
.bc-section__title{font-weight:800;font-size:clamp(1.5rem,3vw,2.25rem);line-height:1.28;color:var(--ink);}
.bc-section--ink .bc-section__title{color:var(--paper);}
.bc-section__note{margin-top:10px;font-size:15px;line-height:1.85;color:var(--slate-deep);}
.bc-section--ink .bc-section__note{color:rgba(245,238,223,.76);}
.bc-lead{max-width:70ch;font-size:clamp(1.02rem,1.6vw,1.2rem);line-height:1.95;color:var(--brown-soft);}
.bc-section--ink .bc-lead{color:rgba(245,238,223,.86);}
.bc-rule{width:64px;height:3px;background:var(--sand);margin-block:clamp(18px,3vw,28px);}

/* ========== 08. 长文容器 ========== */
.bc-prose{max-width:var(--narrow);}
.bc-prose h2{font-size:clamp(1.3rem,2.2vw,1.7rem);line-height:1.35;margin-block:1.9em .6em;}
.bc-prose h3{font-size:1.08rem;line-height:1.5;letter-spacing:.02em;margin-block:1.6em .4em;}
.bc-prose p{margin-block:.9em;font-size:16.5px;line-height:1.9;}
.bc-prose ul,.bc-prose ol{margin-block:.9em;padding-left:1.4em;list-style:disc;}
.bc-prose ol{list-style:decimal;}
.bc-prose li{margin-block:.35em;}
.bc-prose a{color:var(--sand-deep);border-bottom:1px solid rgba(168,78,34,.42);}
.bc-prose a:hover{color:var(--sand);border-bottom-color:var(--sand);}
.bc-prose strong{color:var(--ink);}
.bc-prose blockquote{
  margin-block:1.4em;padding:12px 18px;
  border-left:4px solid var(--sand);background:rgba(232,211,184,.34);
  color:var(--brown-soft);
}

/* ========== 09. 网格 ========== */
.bc-grid{display:grid;gap:clamp(16px,2.4vw,28px);}
.bc-grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.bc-grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
.bc-grid--aside{grid-template-columns:minmax(0,1fr) 232px;gap:clamp(24px,4vw,56px);align-items:start;}
@media (max-width:980px){
  .bc-grid--3{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media (max-width:900px){
  .bc-grid--2,.bc-grid--3,.bc-grid--aside{grid-template-columns:1fr;}
}

/* ========== 10. 索引卡片 ========== */
.bc-card{
  display:flex;flex-direction:column;gap:10px;
  padding:clamp(18px,2.4vw,26px);
  background:var(--paper);
  border:2px solid var(--line);
  box-shadow:var(--shadow-hard);
  transition:transform .18s ease,box-shadow .18s ease;
}
.bc-card:hover{transform:translate(-2px,-2px);box-shadow:10px 10px 0 0 rgba(43,58,69,.2);}
.bc-card__head{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;}
.bc-card__num{font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--sand-deep);}
.bc-card__title{font-family:var(--font-head);font-weight:700;font-size:1.12rem;line-height:1.42;color:var(--ink);}
.bc-card__body{font-size:15px;line-height:1.85;color:var(--slate-deep);}

/* ========== 11. 标签 ========== */
.bc-tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;border:1px solid currentColor;border-radius:1px;
  font-family:var(--font-mono);font-size:11px;line-height:1.6;letter-spacing:.1em;
  color:var(--celadon-deep);background:rgba(92,138,120,.12);
}
.bc-tag--orange{color:var(--sand-deep);background:rgba(217,119,63,.13);}
.bc-tag--green{color:var(--celadon-deep);background:rgba(92,138,120,.16);}

/* ========== 12. 按钮 ========== */
.bc-actions{display:flex;flex-wrap:wrap;align-items:center;gap:12px;}
.bc-btn{
  display:inline-flex;align-items:center;gap:9px;
  padding:12px 20px;
  font-family:var(--font-head);font-size:14.5px;font-weight:600;letter-spacing:.05em;line-height:1.2;
  color:var(--ink);background:var(--paper);
  border:2px solid var(--line);
  box-shadow:4px 4px 0 0 rgba(43,58,69,.88);
  transition:transform .16s ease,box-shadow .16s ease,background-color .16s ease,color .16s ease;
}
.bc-btn:hover{transform:translate(-2px,-2px);box-shadow:6px 6px 0 0 rgba(43,58,69,.85);}
.bc-btn--primary{background:var(--sand);border-color:var(--sand-deep);color:var(--ink);}
.bc-btn--primary:hover{background:var(--amber);}
.bc-btn--ghost{background:transparent;border-color:var(--line);box-shadow:4px 4px 0 0 rgba(43,58,69,.2);}
.bc-section--ink .bc-btn{background:var(--paper);color:var(--ink);border-color:var(--paper);}
.bc-section--ink .bc-btn:hover{background:var(--amber);border-color:var(--amber);}

/* ========== 13. 面包屑 ========== */
.bc-crumbs{padding-block:14px;border-bottom:1px solid rgba(43,58,69,.16);}
.bc-crumbs__list{display:flex;flex-wrap:wrap;align-items:center;gap:6px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;color:var(--slate-deep);}
.bc-crumbs__item{display:inline-flex;align-items:center;gap:6px;}
.bc-crumbs__link{color:var(--sand-deep);}
.bc-crumbs__link:hover{color:var(--sand);text-decoration:underline;text-underline-offset:3px;}
.bc-crumbs__sep{color:var(--slate);}
.bc-crumbs__current{color:var(--ink);}

/* ========== 14. 侧边索引条 ========== */
.bc-index{
  position:sticky;top:100px;
  padding:16px 14px;
  background:var(--paper);
  border:2px solid var(--line);
  box-shadow:var(--shadow-hard);
}
.bc-index__title{
  margin-bottom:12px;padding-bottom:10px;
  border-bottom:2px solid var(--line);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;color:var(--sand-deep);
}
.bc-index__list{display:grid;gap:2px;}
.bc-index__link{
  display:flex;align-items:baseline;gap:8px;
  padding:8px 7px;
  font-family:var(--font-head);font-size:13.5px;line-height:1.5;
  color:var(--slate-deep);
  border-left:3px solid transparent;
  transition:color .16s ease,border-color .16s ease,background-color .16s ease;
}
.bc-index__link:hover{color:var(--ink);background:rgba(232,211,184,.44);}
.bc-index__link.is-active{color:var(--ink);font-weight:600;border-left-color:var(--sand);background:rgba(242,163,101,.18);}
@media (max-width:900px){.bc-index{position:static;}}

/* ========== 15. 图片容器基础规则 ========== */
.bc-media{
  position:relative;overflow:hidden;isolation:isolate;
  aspect-ratio:16 / 10;
  background-color:var(--sand-light);
  background-image:repeating-linear-gradient(45deg,rgba(43,58,69,.06) 0 8px,rgba(255,253,247,0) 8px 16px);
  border:2px solid var(--line);
  box-shadow:var(--shadow-hard);
}
.bc-media__img{width:100%;height:100%;object-fit:cover;filter:saturate(.94) contrast(1.03);}
.bc-media::after{content:"";position:absolute;inset:0;pointer-events:none;box-shadow:inset 0 0 0 1px rgba(255,253,247,.4);}
.bc-media--wide{aspect-ratio:21 / 9;}
.bc-media--tall{aspect-ratio:4 / 5;}
.bc-media--square{aspect-ratio:1 / 1;}
.bc-figure{margin-block:clamp(20px,3vw,32px);}
.bc-figure__cap{margin-top:9px;font-family:var(--font-mono);font-size:11.5px;line-height:1.7;letter-spacing:.05em;color:var(--slate-deep);}

/* ========== 16. 表格基础 ========== */
.bc-table-wrap{width:100%;overflow-x:auto;}
.bc-table{
  width:100%;min-width:560px;
  background:var(--paper);
  border:2px solid var(--line);
  font-size:14.5px;line-height:1.7;
}
.bc-table caption{caption-side:top;text-align:left;padding-bottom:8px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;color:var(--slate-deep);}
.bc-table th,.bc-table td{padding:11px 14px;text-align:left;vertical-align:top;border-bottom:1px solid rgba(43,58,69,.18);}
.bc-table thead th{
  position:sticky;top:0;z-index:2;
  background:var(--ink);color:var(--paper);
  font-family:var(--font-head);font-size:12.5px;font-weight:600;letter-spacing:.08em;
  border-bottom:2px solid var(--line);
}
.bc-table tbody tr:nth-child(even){background:rgba(232,211,184,.24);}
.bc-table tbody tr:hover{background:rgba(242,163,101,.18);}
.bc-table tbody th{font-family:var(--font-head);font-weight:600;color:var(--ink);}

/* ========== 17. 显现协议 ========== */
html.has-js [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .34s ease-out,transform .34s ease-out;
}
html.has-js [data-reveal].is-visible{opacity:1;transform:none;}

/* ========== 18. 打印 ========== */
@media print{
  .bc-header{position:static;background:#fff;color:#111;border-bottom:2px solid #111;box-shadow:none;}
  .bc-brand__mark{border-color:#111;background:#fff;color:#111;box-shadow:none;}
  .bc-brand__name,.bc-nav__link,.bc-nav__index{color:#111;}
  .bc-progress,.bc-nav-toggle,.bc-skip{display:none !important;}
  .bc-footer{background:#fff;color:#111;border-top:2px solid #111;}
  .bc-footer__band,.bc-footer__legal{background:#fff;color:#111;}
  .bc-footer__name,.bc-footer__link,.bc-contact-line__val,.bc-footer__meta{color:#111;}
  .bc-footer__summary,.bc-footer__note,.bc-footer__status,.bc-footer__export{color:#333;}
  .bc-index{position:static;box-shadow:none;}
  a{text-decoration:underline;}
}
@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;}
  html.has-js [data-reveal]{opacity:1;transform:none;transition:none;}
  .bc-skip{transition:none;}
}