/* ============================================================
   逸贝游艺 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头尾 / 通用组件
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{
  -webkit-text-size-adjust:100%;
  text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--yb-header-space) + 12px);
}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd,fieldset{margin:0;padding:0;}
ul,ol{list-style:none;}
img,svg,video,canvas{display:block;max-width:100%;height:auto;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
table{border-collapse:collapse;width:100%;font-variant-numeric:tabular-nums;}
input,select,textarea{font:inherit;color:inherit;}
hr{border:0;border-top:1px solid var(--yb-line);margin:0;}

/* ---------- 2. 变量 ---------- */
:root{
  --yb-indigo:#12263F;
  --yb-night:#0B1B33;
  --yb-paper:#FBF8F1;
  --yb-mist:#5E7FA3;
  --yb-orange:#F28C3A;
  --yb-glow:#FFB36B;
  --yb-ink:#263238;
  --yb-flag-blue:#2E6FD8;
  --yb-flag-white:#F7F3EA;
  --yb-flag-red:#D94B4B;
  --yb-flag-green:#2F9E72;
  --yb-flag-yellow:#F2C94C;

  --yb-line:rgba(18,38,63,.12);
  --yb-line-soft:rgba(94,127,163,.22);
  --yb-line-dark:rgba(251,248,241,.14);

  --yb-radius-sm:14px;
  --yb-radius:24px;
  --yb-radius-lg:36px;

  --yb-maxw:1180px;
  --yb-gutter:clamp(1rem,4vw,2.5rem);
  --yb-header-space:clamp(84px,11vw,112px);

  --yb-font-display:'Archivo Black','Noto Sans SC','Source Han Sans SC','PingFang SC','Microsoft YaHei',sans-serif;
  --yb-font-body:'Noto Sans SC','Source Han Sans SC','PingFang SC','Microsoft YaHei',system-ui,-apple-system,sans-serif;
  --yb-font-mono:'JetBrains Mono','IBM Plex Mono','Courier New',monospace;

  --yb-shadow:0 26px 60px -40px rgba(11,27,51,.85);
  --yb-ease:cubic-bezier(.2,.85,.25,1);
}

/* ---------- 3. 基础排版 ---------- */
body{
  font-family:var(--yb-font-body);
  font-size:clamp(1rem,.28vw + .94rem,1.075rem);
  font-weight:400;
  line-height:1.8;
  color:var(--yb-ink);
  background:var(--yb-paper);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
::selection{background:var(--yb-glow);color:var(--yb-night);}

main{padding-top:var(--yb-header-space);}
main.yb-main--bleed{padding-top:0;}

.yb-container{
  width:100%;
  max-width:var(--yb-maxw);
  margin-inline:auto;
  padding-inline:var(--yb-gutter);
}

.yb-display{
  font-family:var(--yb-font-display);
  font-weight:900;
  font-size:clamp(2.6rem,7.4vw,5.6rem);
  line-height:.98;
  letter-spacing:-.02em;
}
.yb-h1{
  font-family:var(--yb-font-display);
  font-weight:900;
  font-size:clamp(2.1rem,5.2vw,3.6rem);
  line-height:1.06;
  letter-spacing:-.015em;
}
.yb-h2{
  font-family:var(--yb-font-display);
  font-weight:900;
  font-size:clamp(1.55rem,3vw,2.4rem);
  line-height:1.2;
  letter-spacing:-.01em;
}
.yb-h3{
  font-size:clamp(1.08rem,1.6vw,1.35rem);
  line-height:1.4;
  font-weight:800;
}
.yb-lead{
  font-size:clamp(1rem,1.3vw,1.16rem);
  line-height:1.75;
  color:var(--yb-mist);
}
.yb-mono{
  font-family:var(--yb-font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.06em;
}
.yb-muted{color:var(--yb-mist);}
.yb-on-dark{color:var(--yb-paper);}
.yb-on-dark .yb-lead,
.yb-on-dark .yb-muted{color:rgba(251,248,241,.76);}
.yb-prose{max-width:68ch;}
.yb-prose p + p{margin-top:1em;}

.yb-visually-hidden{
  position:absolute!important;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);
  clip-path:inset(50%);white-space:nowrap;border:0;
}

:focus-visible{
  outline:3px solid var(--yb-orange);
  outline-offset:3px;
  border-radius:8px;
}

/* ---------- 4. Skip link ---------- */
.yb-skip{
  position:fixed;
  top:10px;left:50%;
  z-index:1000;
  transform:translate(-50%,-180%);
  padding:.7rem 1.2rem;
  border-radius:999px;
  background:var(--yb-paper);
  color:var(--yb-night);
  font-family:var(--yb-font-mono);
  font-size:.82rem;
  letter-spacing:.08em;
  box-shadow:0 16px 40px -18px rgba(11,27,51,.8);
  transition:transform .25s var(--yb-ease);
}
.yb-skip:focus{transform:translate(-50%,0);}

/* ---------- 5. 头部浮岛 ---------- */
.yb-header{
  position:fixed;
  inset:0 0 auto 0;
  z-index:200;
  padding:clamp(.5rem,1.4vw,1rem) var(--yb-gutter);
  pointer-events:none;
}
.yb-progress{
  position:absolute;
  top:0;left:0;right:0;
  height:3px;
  background:rgba(18,38,63,.16);
  overflow:hidden;
}
.yb-progress i{
  display:block;
  height:100%;
  width:0;
  border-radius:0 3px 3px 0;
  background:linear-gradient(90deg,var(--yb-orange),var(--yb-glow));
  transition:width .12s linear;
}

.yb-header__inner{
  pointer-events:auto;
  position:relative;
  max-width:var(--yb-maxw);
  margin-inline:auto;
  display:flex;
  align-items:center;
  gap:.45rem;
  padding:.42rem .42rem .42rem 1rem;
  border-radius:999px;
  background:rgba(11,27,51,.95);
  border:1px solid rgba(251,248,241,.14);
  box-shadow:0 24px 50px -34px rgba(11,27,51,.95);
  color:var(--yb-paper);
  transition:padding .35s var(--yb-ease),background .35s ease;
}
.yb-header[data-shrink] .yb-header__inner{
  padding:.2rem .28rem .2rem .78rem;
  background:rgba(11,27,51,.985);
}

/* 品牌 */
.yb-brand{
  display:flex;
  align-items:center;
  gap:.6rem;
  flex:0 0 auto;
  padding:.3rem .35rem .3rem 0;
  border-radius:999px;
  color:var(--yb-paper);
}
.yb-brand__flag{display:flex;gap:2px;align-items:flex-start;}
.yb-brand__flag i{
  width:5px;height:15px;
  border-radius:2px;
  transform:skewY(-14deg);
  background:var(--yb-mist);
  transition:height .3s var(--yb-ease);
}
.yb-brand__flag i:nth-child(1){background:var(--yb-flag-blue);}
.yb-brand__flag i:nth-child(2){background:var(--yb-flag-white);}
.yb-brand__flag i:nth-child(3){background:var(--yb-flag-red);}
.yb-brand__flag i:nth-child(4){background:var(--yb-flag-green);}
.yb-brand__flag i:nth-child(5){background:var(--yb-flag-yellow);}
.yb-header[data-shrink] .yb-brand__flag i{height:12px;}
.yb-brand__text{display:flex;flex-direction:column;line-height:1.14;}
.yb-brand__name{
  font-family:var(--yb-font-display);
  font-size:1.02rem;
  font-weight:900;
  letter-spacing:.02em;
}
.yb-brand__tag{
  font-family:var(--yb-font-mono);
  font-size:.62rem;
  letter-spacing:.1em;
  color:rgba(251,248,241,.62);
  max-height:1.2em;
  overflow:hidden;
  transition:opacity .3s ease,max-height .3s ease;
}
.yb-header[data-shrink] .yb-brand__tag{opacity:0;max-height:0;}

/* 桌面导航 */
.yb-nav{margin-left:auto;min-width:0;}
.yb-nav__list{display:flex;align-items:center;gap:2px;}
.yb-nav__link{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  padding:.48rem .72rem;
  border-radius:999px;
  font-size:.84rem;
  font-weight:600;
  white-space:nowrap;
  color:rgba(251,248,241,.76);
  transition:background .2s ease,color .2s ease;
}
.yb-nav__link::before{
  content:"";
  width:6px;height:14px;
  border-radius:2px;
  transform:skewY(-14deg);
  background:var(--flag,var(--yb-mist));
  opacity:.7;
  transition:opacity .2s ease,height .2s ease;
}
.yb-nav__link:hover{background:rgba(251,248,241,.1);color:var(--yb-paper);}
.yb-nav__link:hover::before{opacity:1;}
.yb-nav__link[aria-current="page"]{background:rgba(242,140,58,.18);color:var(--yb-glow);}
.yb-nav__link[aria-current="page"]::before{opacity:1;height:18px;}
.yb-nav__list > li:nth-child(1) .yb-nav__link{--flag:var(--yb-flag-white);}
.yb-nav__list > li:nth-child(2) .yb-nav__link{--flag:var(--yb-flag-green);}
.yb-nav__list > li:nth-child(3) .yb-nav__link{--flag:var(--yb-flag-blue);}
.yb-nav__list > li:nth-child(4) .yb-nav__link{--flag:var(--yb-flag-red);}
.yb-nav__list > li:nth-child(5) .yb-nav__link{--flag:var(--yb-flag-yellow);}
.yb-nav__list > li:nth-child(6) .yb-nav__link{--flag:var(--yb-orange);}

.yb-nav__foot{display:none;}
.yb-nav__footline{
  font-family:var(--yb-font-mono);
  font-size:.72rem;
  letter-spacing:.06em;
  color:rgba(251,248,241,.6);
}
.yb-nav__footbtn{width:100%;}

/* 头部 CTA */
.yb-cta{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  padding:.6rem 1.05rem;
  border-radius:999px;
  background:linear-gradient(135deg,var(--yb-orange),var(--yb-glow));
  color:var(--yb-night);
  font-size:.84rem;
  font-weight:800;
  letter-spacing:.01em;
  box-shadow:0 12px 24px -16px rgba(242,140,58,1);
  transition:transform .2s var(--yb-ease),filter .2s ease,box-shadow .2s ease;
}
.yb-cta:hover{transform:translateY(-1px);filter:brightness(1.06);box-shadow:0 16px 28px -16px rgba(242,140,58,1);}

/* 移动按钮 */
.yb-navtoggle{
  display:none;
  align-items:center;
  gap:.5rem;
  padding:.5rem .85rem;
  border-radius:999px;
  border:1px solid rgba(251,248,241,.26);
  color:var(--yb-paper);
  font-family:var(--yb-font-mono);
  font-size:.78rem;
  letter-spacing:.1em;
}
.yb-navtoggle__bars{display:flex;flex-direction:column;gap:3px;width:16px;}
.yb-navtoggle__bars i{
  display:block;
  height:2px;
  border-radius:2px;
  background:currentColor;
  transition:transform .25s var(--yb-ease),opacity .2s ease;
}
.yb-navtoggle[aria-expanded="true"] .yb-navtoggle__bars i:nth-child(1){transform:translateY(5px) rotate(45deg);}
.yb-navtoggle[aria-expanded="true"] .yb-navtoggle__bars i:nth-child(2){opacity:0;}
.yb-navtoggle[aria-expanded="true"] .yb-navtoggle__bars i:nth-child(3){transform:translateY(-5px) rotate(-45deg);}

/* 遮罩 */
.yb-scrim{
  position:fixed;
  inset:0;
  z-index:205;
  background:rgba(11,27,51,.55);
  opacity:0;
  visibility:hidden;
  pointer-events:none;
  transition:opacity .3s ease,visibility .3s ease;
}
.yb-header[data-nav-open] .yb-scrim{opacity:1;visibility:visible;pointer-events:auto;}

/* ---------- 6. 移动端底部胶囊抽屉 ---------- */
@media (max-width:1024px){
  .yb-navtoggle{display:inline-flex;}
  .yb-cta{display:none;}
  .yb-header__inner{
    justify-content:space-between;
    padding:.45rem .5rem .45rem .85rem;
  }
  .yb-nav{
    position:fixed;
    left:10px;right:10px;bottom:10px;
    z-index:210;
    margin:0;
    padding:.8rem;
    border-radius:28px;
    background:rgba(11,27,51,.985);
    border:1px solid rgba(251,248,241,.16);
    box-shadow:0 -26px 60px -30px rgba(0,0,0,.9);
    max-height:min(76vh,540px);
    overflow-y:auto;
    transform:translateY(calc(100% + 24px));
    opacity:0;
    visibility:hidden;
    pointer-events:auto;
    transition:transform .4s var(--yb-ease),opacity .3s ease,visibility .3s ease;
  }
  .yb-nav[data-open]{
    transform:translateY(0);
    opacity:1;
    visibility:visible;
  }
  .yb-nav__list{flex-direction:column;align-items:stretch;gap:2px;}
  .yb-nav__link{
    justify-content:flex-start;
    padding:.78rem .9rem;
    border-radius:16px;
    font-size:.98rem;
  }
  .yb-nav__link::before{height:16px;}
  .yb-nav__foot{
    display:flex;
    flex-direction:column;
    gap:.6rem;
    margin-top:.7rem;
    padding-top:.8rem;
    border-top:1px solid var(--yb-line-dark);
  }
}
@media (max-width:420px){
  .yb-brand__tag{display:none;}
  .yb-navtoggle__label{display:none;}
}

/* ---------- 7. 页脚 ---------- */
.yb-footer{
  position:relative;
  margin-top:clamp(3rem,7vw,6rem);
  background:var(--yb-indigo);
  color:var(--yb-paper);
  padding-bottom:clamp(1.2rem,2.5vw,2rem);
}
.yb-footer__flags{
  display:grid;
  grid-template-columns:repeat(5,1fr);
  height:6px;
}
.yb-footer__flags i{display:block;height:100%;}
.yb-footer__flags i:nth-child(1){background:var(--yb-flag-blue);}
.yb-footer__flags i:nth-child(2){background:var(--yb-flag-white);}
.yb-footer__flags i:nth-child(3){background:var(--yb-flag-red);}
.yb-footer__flags i:nth-child(4){background:var(--yb-flag-green);}
.yb-footer__flags i:nth-child(5){background:var(--yb-flag-yellow);}

.yb-footer__inner{padding-top:clamp(2.2rem,5vw,3.6rem);}
.yb-footer__top{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1.35fr);
  gap:clamp(2rem,4vw,4rem);
}
.yb-footer__brand{
  display:inline-block;
  font-family:var(--yb-font-display);
  font-weight:900;
  font-size:clamp(1.7rem,3.2vw,2.5rem);
  letter-spacing:.02em;
  line-height:1.1;
}
.yb-footer__summary{
  margin-top:.9rem;
  max-width:38ch;
  font-size:.94rem;
  line-height:1.85;
  color:rgba(251,248,241,.72);
}
.yb-footer__ctas{display:flex;flex-wrap:wrap;gap:.6rem;margin-top:1.5rem;}
.yb-footer__cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(1.4rem,3vw,2.4rem);
}
.yb-footer__coltitle{
  margin-bottom:1rem;
  font-family:var(--yb-font-mono);
  font-size:.7rem;
  font-weight:600;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--yb-glow);
}
.yb-footer__col ul li + li{margin-top:.55rem;}
.yb-footer__col a{
  font-size:.94rem;
  color:rgba(251,248,241,.78);
  border-bottom:1px solid transparent;
  transition:color .2s ease,border-color .2s ease;
}
.yb-footer__col a:hover{color:var(--yb-paper);border-bottom-color:var(--yb-orange);}

.yb-footer__contact li + li{margin-top:.9rem;}
.yb-footer__item{display:flex;flex-direction:column;gap:.28rem;}
.yb-footer__label{
  font-family:var(--yb-font-mono);
  font-size:.64rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:rgba(251,248,241,.5);
}
.yb-footer__value{
  font-family:var(--yb-font-mono);
  font-size:.84rem;
  line-height:1.6;
  color:rgba(251,248,241,.88);
  word-break:break-word;
}
.yb-copy{
  align-self:flex-start;
  margin-top:.15rem;
  padding:.24rem .6rem;
  border-radius:999px;
  border:1px solid rgba(251,248,241,.26);
  font-family:var(--yb-font-mono);
  font-size:.68rem;
  letter-spacing:.08em;
  color:rgba(251,248,241,.78);
  transition:background .2s ease,color .2s ease,border-color .2s ease;
}
.yb-copy:hover{background:rgba(242,140,58,.2);border-color:rgba(242,140,58,.6);color:var(--yb-glow);}
.yb-copy.is-copied{background:rgba(47,158,114,.24);border-color:rgba(47,158,114,.7);color:#9BE3C4;}
.yb-footer__note{
  margin-top:1rem;
  font-size:.78rem;
  line-height:1.75;
  color:rgba(251,248,241,.55);
}
.yb-footer__bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.5rem 1.5rem;
  margin-top:clamp(2rem,4vw,3rem);
  padding-top:1.2rem;
  border-top:1px solid var(--yb-line-dark);
  font-family:var(--yb-font-mono);
  font-size:.74rem;
  letter-spacing:.04em;
  color:rgba(251,248,241,.6);
}
.yb-footer__legal-links{display:flex;flex-wrap:wrap;gap:.4rem 1rem;}
.yb-footer__legal-links a:hover{color:var(--yb-glow);}

@media (max-width:900px){
  .yb-footer__top{grid-template-columns:1fr;}
  .yb-footer__cols{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media (max-width:560px){
  .yb-footer__cols{grid-template-columns:1fr;}
  .yb-footer__bottom{justify-content:flex-start;}
}

/* ---------- 8. 通用按钮 ---------- */
.yb-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  padding:.76rem 1.35rem;
  border-radius:999px;
  border:1px solid transparent;
  font-size:.9rem;
  font-weight:800;
  line-height:1.2;
  text-align:center;
  transition:background .2s ease,color .2s ease,border-color .2s ease,transform .2s var(--yb-ease);
}
.yb-btn:hover{transform:translateY(-1px);}
.yb-btn--primary{background:var(--yb-orange);color:var(--yb-night);}
.yb-btn--primary:hover{background:var(--yb-glow);}
.yb-btn--ink{background:var(--yb-indigo);color:var(--yb-paper);}
.yb-btn--ink:hover{background:var(--yb-night);}
.yb-btn--ghost{border-color:rgba(251,248,241,.34);color:var(--yb-paper);}
.yb-btn--ghost:hover{background:rgba(251,248,241,.12);}
.yb-btn--quiet{border-color:rgba(18,38,63,.22);color:var(--yb-indigo);}
.yb-btn--quiet:hover{background:rgba(18,38,63,.06);}

/* ---------- 9. 标签 ---------- */
.yb-tag{
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  padding:.24rem .62rem;
  border-radius:999px;
  font-family:var(--yb-font-mono);
  font-size:.7rem;
  letter-spacing:.08em;
  line-height:1.5;
  background:rgba(94,127,163,.14);
  color:var(--yb-indigo);
  border:1px solid transparent;
}
.yb-tag--blue{background:rgba(46,111,216,.14);color:#1E4C99;border-color:rgba(46,111,216,.32);}
.yb-tag--green{background:rgba(47,158,114,.14);color:#1E6E4E;border-color:rgba(47,158,114,.32);}
.yb-tag--red{background:rgba(217,75,75,.13);color:#A53232;border-color:rgba(217,75,75,.3);}
.yb-tag--yellow{background:rgba(242,201,76,.24);color:#6E5410;border-color:rgba(242,201,76,.55);}
.yb-tag--orange{background:rgba(242,140,58,.16);color:#9C4E12;border-color:rgba(242,140,58,.4);}

/* ---------- 10. 章节 / 卡片 / 栅格 ---------- */
.yb-chapter{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:clamp(.8rem,2vw,1.6rem);
  align-items:start;
  margin-bottom:clamp(1.2rem,2.4vw,2rem);
}
.yb-chapter__num{
  padding-top:.55rem;
  font-family:var(--yb-font-mono);
  font-size:.78rem;
  letter-spacing:.2em;
  color:var(--yb-orange);
  white-space:nowrap;
}
.yb-chapter__main{min-width:0;}
.yb-chapter__main p{margin-top:.7rem;}

.yb-card{
  position:relative;
  padding:clamp(1.1rem,2.2vw,1.7rem);
  border-radius:var(--yb-radius);
  background:#fff;
  border:1px solid var(--yb-line);
  box-shadow:var(--yb-shadow);
}
.yb-card--dark{
  background:var(--yb-indigo);
  border-color:rgba(251,248,241,.12);
  color:var(--yb-paper);
}

.yb-grid{display:grid;gap:clamp(1rem,2vw,1.5rem);}
.yb-grid--2{grid-template-columns:repeat(auto-fit,minmax(min(100%,320px),1fr));}
.yb-grid--3{grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr));}
.yb-grid--halves{grid-template-columns:repeat(auto-fit,minmax(min(100%,360px),1fr));}

/* ---------- 11. 横向主题带 ---------- */
.yb-band{
  overflow-x:auto;
  overscroll-behavior-x:contain;
  scroll-snap-type:x proximity;
  -webkit-overflow-scrolling:touch;
  padding-block:.4rem;
}
.yb-band__track{
  display:flex;
  gap:.7rem;
  width:max-content;
  padding-inline:.2rem;
}
.yb-band__track > *{scroll-snap-align:start;}

/* ---------- 12. 图片容器 ---------- */
.yb-media{
  position:relative;
  overflow:hidden;
  border-radius:var(--yb-radius-lg);
  border:1px solid var(--yb-line);
  background:
    linear-gradient(150deg,rgba(46,111,216,.34),rgba(18,38,63,.92) 58%,rgba(242,140,58,.34)),
    var(--yb-indigo);
  aspect-ratio:16/10;
  isolation:isolate;
}
.yb-media--wide{aspect-ratio:21/9;}
.yb-media--square{aspect-ratio:1/1;}
.yb-media--tall{aspect-ratio:3/4;}
.yb-media--frame{border:3px solid var(--yb-orange);}
.yb-media::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:0;
  background-image:
    repeating-linear-gradient(115deg,rgba(251,248,241,.09) 0 1px,transparent 1px 16px),
    repeating-linear-gradient(25deg,rgba(251,248,241,.05) 0 1px,transparent 1px 26px);
  pointer-events:none;
}
.yb-media img,
.yb-media video{
  position:relative;
  z-index:1;
  width:100%;
  height:100%;
  object-fit:cover;
}
.yb-media__caption{
  position:absolute;
  z-index:2;
  left:.9rem;bottom:.9rem;
  padding:.28rem .7rem;
  border-radius:999px;
  background:rgba(11,27,51,.78);
  color:var(--yb-paper);
  font-family:var(--yb-font-mono);
  font-size:.68rem;
  letter-spacing:.1em;
}

/* ---------- 13. 表格 ---------- */
.yb-table__wrap{
  overflow:auto;
  border-radius:var(--yb-radius);
  border:1px solid var(--yb-line);
  background:#fff;
}
.yb-table{
  min-width:640px;
  font-size:.92rem;
  line-height:1.65;
}
.yb-table th,
.yb-table td{
  padding:.75rem 1rem;
  text-align:left;
  vertical-align:top;
  border-bottom:1px solid var(--yb-line-soft);
}
.yb-table thead th{
  position:sticky;
  top:0;
  z-index:2;
  background:var(--yb-indigo);
  color:var(--yb-paper);
  font-family:var(--yb-font-mono);
  font-size:.72rem;
  font-weight:600;
  letter-spacing:.12em;
  text-transform:uppercase;
  white-space:nowrap;
}
.yb-table tbody th{
  position:sticky;
  left:0;
  z-index:1;
  background:#fff;
  font-weight:800;
  white-space:nowrap;
}
.yb-table tbody tr:nth-child(even) td{background:rgba(94,127,163,.07);}
.yb-table tbody tr:nth-child(even) th{background:rgba(94,127,163,.07);}
.yb-table tbody tr:hover td{background:rgba(242,140,58,.1);}
.yb-table tbody tr:hover th{background:rgba(242,140,58,.1);}
.yb-table tr[data-highlight] th,
.yb-table tr[data-highlight] td{box-shadow:inset 4px 0 0 var(--yb-orange);}

/* ---------- 14. 面包屑 / 目录 / 提示 ---------- */
.yb-breadcrumb{
  font-family:var(--yb-font-mono);
  font-size:.74rem;
  letter-spacing:.06em;
  color:var(--yb-mist);
}
.yb-breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:.45rem;}
.yb-breadcrumb li{display:flex;align-items:center;gap:.45rem;}
.yb-breadcrumb li:not(:last-child)::after{content:"/";opacity:.5;}
.yb-breadcrumb a:hover{color:var(--yb-orange);}
.yb-breadcrumb [aria-current="page"]{color:var(--yb-indigo);}

.yb-toc{display:flex;flex-direction:column;gap:2px;}
.yb-toc__link{
  display:block;
  padding:.45rem .8rem;
  border-radius:999px;
  border-left:2px solid transparent;
  font-size:.86rem;
  color:var(--yb-mist);
  transition:background .2s ease,color .2s ease;
}
.yb-toc__link:hover{background:rgba(94,127,163,.1);color:var(--yb-indigo);}
.yb-toc__link[aria-current="true"]{
  background:rgba(242,140,58,.14);
  border-left-color:var(--yb-orange);
  color:var(--yb-indigo);
  font-weight:800;
}

.yb-callout{
  padding:clamp(1rem,2vw,1.4rem);
  border-radius:var(--yb-radius);
  border:1px solid rgba(242,140,58,.4);
  border-left:5px solid var(--yb-orange);
  background:rgba(242,140,58,.08);
  color:var(--yb-indigo);
}
.yb-flagset{display:flex;gap:4px;}
.yb-flagset i{
  display:block;
  width:10px;height:26px;
  border-radius:3px;
  transform:skewY(-14deg);
  background:var(--yb-mist);
}
.yb-flagset i:nth-child(1){background:var(--yb-flag-blue);}
.yb-flagset i:nth-child(2){background:var(--yb-flag-white);border:1px solid var(--yb-line-soft);}
.yb-flagset i:nth-child(3){background:var(--yb-flag-red);}
.yb-flagset i:nth-child(4){background:var(--yb-flag-green);}
.yb-flagset i:nth-child(5){background:var(--yb-flag-yellow);}

/* ---------- 15. 滚动显现 ---------- */
html.yb-motion [data-reveal]{
  opacity:0;
  transform:translateY(18px);
}
html.yb-motion [data-reveal].is-inview{
  opacity:1;
  transform:none;
  transition:opacity .6s ease,transform .6s var(--yb-ease);
  transition-delay:var(--yb-delay,0ms);
}
html.yb-motion [data-chapter] .yb-chapter__num{
  opacity:.45;
  transition:opacity .5s ease;
}
html.yb-motion [data-chapter].is-inview .yb-chapter__num{opacity:1;}

/* ---------- 16. 降低动效 ---------- */
@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;
  }
  html.yb-motion [data-reveal],
  html.yb-motion [data-chapter] .yb-chapter__num{opacity:1;transform:none;}
  .yb-nav{transition:none;}
}