/* =========================================================
   必赢国际437 · Site Kit 共享样式  /assets/site.css
   深球场绿 · 夜场绿 · 岩灰 · 苔绿 · 陶土 · 米白 · 荧光黄 · 科技蓝
   ========================================================= */

/* ---------- 01 · 变量 ---------- */
:root{
  --bw-deep:#071A12;
  --bw-night:#0D2B1E;
  --bw-rock:#1C2422;
  --bw-moss:#3F6B4A;
  --bw-clay:#C97B5A;
  --bw-cream:#F4EFE4;
  --bw-signal:#E6FF3F;
  --bw-blue:#2D7DFF;
  --bw-mist:#A8B5A0;
  --bw-grad:linear-gradient(135deg,#0A3D3A 0%,#2D7DFF 100%);
  --bw-line:rgba(244,239,228,.14);
  --bw-line-soft:rgba(244,239,228,.07);
  --bw-ink:#06180F;
  --bw-font-sans:'Noto Sans SC','Source Han Sans SC','PingFang SC','Microsoft YaHei',sans-serif;
  --bw-font-mono:'JetBrains Mono','Roboto Mono','SFMono-Regular',Consolas,monospace;
  --bw-shell:1320px;
  --bw-gutter:clamp(18px,4.4vw,56px);
  --bw-radius:14px;
  --bw-radius-sm:10px;
  --bw-ease:cubic-bezier(.22,.61,.36,1);
  --bw-glow:0 0 0 1px rgba(230,255,63,.38), 0 14px 34px rgba(230,255,63,.14);
}

/* ---------- 02 · Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:104px;
}
body,
h1,h2,h3,h4,p,figure,blockquote,dl,dd{margin:0;}
body{
  min-height:100%;
  background-color:var(--bw-deep);
  background-image:
    radial-gradient(58% 42% at 8% -6%, rgba(63,107,74,.55) 0%, rgba(63,107,74,0) 72%),
    radial-gradient(46% 34% at 98% 4%, rgba(45,125,255,.18) 0%, rgba(45,125,255,0) 74%),
    radial-gradient(52% 38% at 46% 104%, rgba(201,123,90,.14) 0%, rgba(201,123,90,0) 72%);
  color:var(--bw-cream);
  font-family:var(--bw-font-sans);
  font-size:1rem;
  line-height:1.75;
  font-weight:400;
  letter-spacing:.01em;
  overflow-x:hidden;
}
img,video,svg,canvas{max-width:100%;height:auto;display:block;}
a{color:inherit;}
button{font:inherit;color:inherit;background:none;border:0;}
::selection{background:var(--bw-signal);color:var(--bw-ink);}
:focus-visible{outline:2px solid var(--bw-signal);outline-offset:3px;border-radius:6px;}

/* ---------- 03 · 排版 ---------- */
.bw-h1{
  font-size:clamp(2.8rem,7vw,6rem);
  font-weight:200;
  line-height:1.05;
  letter-spacing:-.02em;
}
.bw-h2{
  font-size:clamp(1.7rem,3.2vw,2.5rem);
  font-weight:800;
  line-height:1.2;
  letter-spacing:-.01em;
}
.bw-h3{
  font-size:clamp(1.25rem,2vw,1.6rem);
  font-weight:700;
  line-height:1.3;
}
.bw-lede{
  font-size:clamp(1.04rem,1.5vw,1.28rem);
  line-height:1.78;
  color:rgba(244,239,228,.86);
  max-width:66ch;
}
.bw-text{color:rgba(244,239,228,.8);max-width:70ch;}
.bw-mono{
  font-family:var(--bw-font-mono);
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1;
  letter-spacing:.04em;
}
.bw-signal{color:var(--bw-signal);}
.bw-link{
  color:var(--bw-blue);
  text-decoration:none;
  border-bottom:1px solid rgba(45,125,255,.45);
  transition:color .2s var(--bw-ease),border-color .2s var(--bw-ease);
}
.bw-link:hover{color:var(--bw-signal);border-color:var(--bw-signal);}

/* ---------- 04 · 布局 ---------- */
.bw-shell{
  width:100%;
  max-width:var(--bw-shell);
  margin-inline:auto;
  padding-inline:var(--bw-gutter);
}
.bw-section{
  position:relative;
  padding-block:clamp(48px,7.5vw,110px);
}
.bw-section--tight{padding-block:clamp(28px,4vw,56px);}
.bw-section--night{background:var(--bw-night);}
.bw-section--rock{background:var(--bw-rock);}
.bw-section--moss{background:linear-gradient(180deg,var(--bw-night) 0%,rgba(63,107,74,.55) 100%);}
.bw-rule{
  height:1px;
  border:0;
  margin-block:clamp(20px,3vw,40px);
  background:linear-gradient(90deg,var(--bw-line) 0%,rgba(244,239,228,0) 92%);
}

/* ---------- 05 · 网格 ---------- */
.bw-grid{display:grid;gap:clamp(18px,2.4vw,34px);}
.bw-grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.bw-grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
.bw-grid--asym{grid-template-columns:minmax(0,7fr) minmax(0,5fr);}
.bw-grid--asym-r{grid-template-columns:minmax(0,5fr) minmax(0,7fr);}
.bw-grid--sidebar{grid-template-columns:minmax(0,3fr) minmax(0,9fr);}

/* ---------- 06 · 章节与标题组 ---------- */
.bw-chapter{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:clamp(14px,2vw,28px);
  align-items:start;
  margin-bottom:clamp(24px,4vw,48px);
}
.bw-chapter__num{
  font-family:var(--bw-font-mono);
  font-size:.8rem;
  letter-spacing:.28em;
  color:var(--bw-clay);
  padding-top:.7em;
  white-space:nowrap;
}
.bw-chapter__title{
  font-size:clamp(2rem,4vw,3.4rem);
  font-weight:800;
  line-height:1.14;
  letter-spacing:-.015em;
}
.bw-chapter__lead{
  margin-top:14px;
  max-width:62ch;
  color:var(--bw-mist);
}
.bw-label{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--bw-font-mono);
  font-size:.72rem;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--bw-mist);
}
.bw-label::before{
  content:"";
  width:8px;
  height:8px;
  flex:none;
  background:var(--bw-signal);
}

/* ---------- 07 · 数据与说明组件 ---------- */
.bw-panel{
  background:linear-gradient(160deg,rgba(13,43,30,.92) 0%,rgba(7,26,18,.62) 100%);
  border:1px solid var(--bw-line-soft);
  border-radius:var(--bw-radius);
  padding:clamp(18px,2.4vw,32px);
}
.bw-panel--tint{
  background-image:var(--bw-grad);
  background-color:var(--bw-night);
  border-color:rgba(45,125,255,.28);
}
.bw-kpi{display:grid;gap:6px;}
.bw-kpi__num{
  font-family:var(--bw-font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(1.8rem,3.4vw,2.8rem);
  font-weight:700;
  line-height:1;
  color:var(--bw-signal);
}
.bw-kpi__label{
  font-size:.82rem;
  letter-spacing:.1em;
  color:var(--bw-mist);
}
.bw-note{
  border-left:3px solid var(--bw-clay);
  padding:10px 0 10px 16px;
  font-size:.9rem;
  color:var(--bw-mist);
}
.bw-note__label{
  display:block;
  font-family:var(--bw-font-mono);
  font-size:.7rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--bw-clay);
  margin-bottom:4px;
}
.bw-tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 11px;
  border:1px solid var(--bw-line);
  border-radius:999px;
  font-family:var(--bw-font-mono);
  font-size:.74rem;
  letter-spacing:.1em;
  color:var(--bw-mist);
}
.bw-tag--signal{border-color:rgba(230,255,63,.5);color:var(--bw-signal);}
.bw-tag--clay{border-color:rgba(201,123,90,.5);color:var(--bw-clay);}
.bw-table{
  width:100%;
  border-collapse:collapse;
  font-size:.92rem;
  font-variant-numeric:tabular-nums;
}
.bw-table th{
  font-family:var(--bw-font-mono);
  font-size:.72rem;
  font-weight:500;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--bw-mist);
  text-align:left;
  padding:10px 12px;
  border-bottom:1px solid var(--bw-line);
  white-space:nowrap;
}
.bw-table td{
  padding:12px;
  border-bottom:1px solid var(--bw-line-soft);
}
.bw-table tbody tr{transition:background .2s var(--bw-ease);}
.bw-table tbody tr:hover{background:rgba(244,239,228,.045);}
.bw-table__rank{
  font-family:var(--bw-font-mono);
  color:var(--bw-clay);
  letter-spacing:.08em;
}
.bw-table__num{
  font-family:var(--bw-font-mono);
  font-variant-numeric:tabular-nums;
  color:var(--bw-signal);
}
.bw-timeline{
  list-style:none;
  margin:0;
  padding:0 0 0 26px;
  display:grid;
  gap:18px;
  position:relative;
}
.bw-timeline::before{
  content:"";
  position:absolute;
  left:6px;
  top:6px;
  bottom:6px;
  width:1px;
  background:linear-gradient(180deg,var(--bw-clay) 0%,rgba(244,239,228,.1) 100%);
}
.bw-timeline__item{position:relative;}
.bw-timeline__node{
  position:absolute;
  left:-26px;
  top:6px;
  width:13px;
  height:13px;
  border-radius:50%;
  background:var(--bw-rock);
  border:2px solid var(--bw-clay);
}
.bw-timeline__time{
  font-family:var(--bw-font-mono);
  font-size:.76rem;
  letter-spacing:.16em;
  color:var(--bw-mist);
  display:block;
}
.bw-index{
  list-style:none;
  margin:0;
  padding:0;
  border-top:1px solid var(--bw-line-soft);
}
.bw-index__item{border-bottom:1px solid var(--bw-line-soft);}
.bw-index__link{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  gap:14px;
  align-items:baseline;
  padding:14px 4px;
  text-decoration:none;
  color:var(--bw-cream);
  transition:padding .25s var(--bw-ease),background .25s var(--bw-ease);
}
.bw-index__link:hover{padding-left:14px;background:rgba(244,239,228,.045);}
.bw-index__num{
  font-family:var(--bw-font-mono);
  font-size:.74rem;
  letter-spacing:.14em;
  color:var(--bw-clay);
}
.bw-index__title{font-size:1.02rem;}
.bw-index__meta{
  font-family:var(--bw-font-mono);
  font-size:.74rem;
  color:var(--bw-mist);
  white-space:nowrap;
}

/* ---------- 08 · 图片容器 ---------- */
.bw-frame{
  position:relative;
  display:block;
  overflow:hidden;
  isolation:isolate;
  border-radius:var(--bw-radius);
  aspect-ratio:16 / 9;
  background-color:var(--bw-night);
  background-image:var(--bw-grad);
}
.bw-frame > img,
.bw-frame > video{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.bw-frame::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(7,26,18,0) 46%,rgba(7,26,18,.74) 100%);
  pointer-events:none;
}
.bw-frame--wide{aspect-ratio:21 / 9;}
.bw-frame--tall{aspect-ratio:4 / 5;}
.bw-frame--square{aspect-ratio:1 / 1;}
.bw-frame--fill{aspect-ratio:auto;min-height:220px;height:100%;}
.bw-frame__badge{
  position:absolute;
  left:14px;
  bottom:14px;
  z-index:2;
  font-family:var(--bw-font-mono);
  font-size:.72rem;
  letter-spacing:.16em;
  padding:5px 11px;
  border-radius:999px;
  background:rgba(7,26,18,.72);
  border:1px solid var(--bw-line);
  color:var(--bw-cream);
}

/* ---------- 09 · 面包屑 ---------- */
.bw-breadcrumb{padding-block:18px;}
.bw-breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  list-style:none;
  margin:0;
  padding:0;
  font-family:var(--bw-font-mono);
  font-size:.76rem;
  letter-spacing:.12em;
  color:var(--bw-mist);
}
.bw-breadcrumb__item{display:inline-flex;align-items:center;gap:8px;}
.bw-breadcrumb__link{
  color:var(--bw-mist);
  text-decoration:none;
  transition:color .2s var(--bw-ease);
}
.bw-breadcrumb__link:hover{color:var(--bw-signal);}
.bw-breadcrumb__sep{color:rgba(168,181,160,.45);}

/* ---------- 10 · 按钮 ---------- */
.bw-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 22px;
  border-radius:999px;
  border:1px solid transparent;
  font-size:.9rem;
  font-weight:700;
  letter-spacing:.02em;
  text-decoration:none;
  cursor:pointer;
  transition:transform .2s var(--bw-ease),box-shadow .2s var(--bw-ease),
             background-color .2s var(--bw-ease),color .2s var(--bw-ease),
             border-color .2s var(--bw-ease);
}
.bw-btn--signal{background:var(--bw-signal);color:var(--bw-ink);}
.bw-btn--signal:hover{transform:translateY(-2px);box-shadow:var(--bw-glow);}
.bw-btn--ghost{
  border-color:var(--bw-line);
  color:var(--bw-cream);
  background:rgba(244,239,228,.03);
}
.bw-btn--ghost:hover{border-color:var(--bw-signal);color:var(--bw-signal);}
.bw-btn--quiet{padding:6px 2px;color:var(--bw-mist);border-radius:6px;}
.bw-btn--quiet:hover{color:var(--bw-signal);}

/* ---------- 11 · 头部 ---------- */
.bw-header{
  position:sticky;
  top:0;
  z-index:80;
  color:var(--bw-cream);
  background:rgba(28,36,34,.9);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--bw-line);
}
.bw-header::after{
  content:"";
  display:block;
  height:3px;
  background:linear-gradient(90deg,var(--bw-signal) 0%,var(--bw-moss) 34%,var(--bw-blue) 72%,var(--bw-clay) 100%);
  opacity:.85;
}
.bw-header__inner{
  position:relative;
  width:100%;
  max-width:var(--bw-shell);
  margin-inline:auto;
  display:flex;
  align-items:center;
  gap:clamp(12px,2vw,26px);
  padding:13px var(--bw-gutter);
}
.bw-skip{
  position:absolute;
  left:var(--bw-gutter);
  top:10px;
  z-index:120;
  transform:translateY(-220%);
  background:var(--bw-signal);
  color:var(--bw-ink);
  font-weight:700;
  font-size:.86rem;
  padding:10px 16px;
  border-radius:8px;
  text-decoration:none;
  transition:transform .22s var(--bw-ease);
}
.bw-skip:focus{transform:translateY(0);}
.bw-progress{
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:2px;
  background:rgba(244,239,228,.06);
}
.bw-progress__bar{
  display:block;
  height:100%;
  width:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--bw-signal),var(--bw-blue));
}
.bw-brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  text-decoration:none;
  color:var(--bw-cream);
  flex:none;
}
.bw-brand__mark{
  position:relative;
  width:34px;
  height:34px;
  flex:none;
  border-radius:var(--bw-radius-sm);
  background-image:var(--bw-grad);
  box-shadow:inset 0 0 0 1px rgba(244,239,228,.16);
}
.bw-brand__mark::after{
  content:"";
  position:absolute;
  right:5px;
  bottom:5px;
  width:9px;
  height:9px;
  border-radius:50%;
  background:var(--bw-signal);
}
.bw-brand__text{display:block;}
.bw-brand__name{
  display:block;
  font-size:1.05rem;
  font-weight:700;
  letter-spacing:.04em;
  line-height:1.25;
}
.bw-brand__sub{
  display:block;
  font-family:var(--bw-font-mono);
  font-size:.66rem;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--bw-mist);
}
.bw-quick{
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin-inline:auto;
  padding:8px 16px;
  border:1px dashed rgba(244,239,228,.24);
  border-radius:999px;
  font-size:.84rem;
  color:var(--bw-mist);
  text-decoration:none;
  white-space:nowrap;
  transition:border-color .2s var(--bw-ease),color .2s var(--bw-ease),background-color .2s var(--bw-ease);
}
.bw-quick:hover{
  border-color:var(--bw-signal);
  color:var(--bw-cream);
  background:rgba(244,239,228,.04);
}
.bw-quick__dot{
  width:8px;
  height:8px;
  flex:none;
  border-radius:50%;
  background:var(--bw-clay);
  box-shadow:0 0 0 4px rgba(201,123,90,.18);
}
.bw-quick__label{letter-spacing:.02em;}
.bw-quick__meta{
  font-family:var(--bw-font-mono);
  font-size:.68rem;
  letter-spacing:.16em;
  color:rgba(168,181,160,.75);
}
.bw-nav{display:flex;align-items:center;}
.bw-nav__list{
  display:flex;
  align-items:center;
  gap:2px;
  list-style:none;
  margin:0;
  padding:0;
}
.bw-nav__item{list-style:none;}
.bw-nav__link{
  position:relative;
  display:inline-block;
  padding:9px 12px;
  border-radius:8px;
  font-size:.92rem;
  letter-spacing:.02em;
  color:var(--bw-mist);
  text-decoration:none;
  white-space:nowrap;
  transition:color .2s var(--bw-ease),background-color .2s var(--bw-ease);
}
.bw-nav__link:hover{color:var(--bw-cream);background:rgba(244,239,228,.05);}
.bw-nav__link[aria-current="page"]{color:var(--bw-signal);}
.bw-nav__link[aria-current="page"]::after{
  content:"";
  position:absolute;
  left:12px;
  right:12px;
  bottom:2px;
  height:2px;
  border-radius:2px;
  background:var(--bw-signal);
}
.bw-header__cta{
  flex:none;
  font-size:.86rem;
  padding:9px 18px;
}
.bw-nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:9px 13px;
  border:1px solid var(--bw-line);
  border-radius:var(--bw-radius-sm);
  color:var(--bw-cream);
  cursor:pointer;
  transition:border-color .2s var(--bw-ease),color .2s var(--bw-ease);
}
.bw-nav-toggle:hover{border-color:var(--bw-signal);color:var(--bw-signal);}
.bw-nav-toggle__bars{
  display:grid;
  gap:4px;
  width:18px;
}
.bw-nav-toggle__bars span{
  display:block;
  height:2px;
  border-radius:2px;
  background:currentColor;
  transition:transform .25s var(--bw-ease),opacity .2s var(--bw-ease);
}
.bw-nav-toggle[aria-expanded="true"] .bw-nav-toggle__bars span:nth-child(1){transform:translateY(6px) rotate(45deg);}
.bw-nav-toggle[aria-expanded="true"] .bw-nav-toggle__bars span:nth-child(2){opacity:0;}
.bw-nav-toggle[aria-expanded="true"] .bw-nav-toggle__bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}
.bw-nav-toggle__label{
  font-family:var(--bw-font-mono);
  font-size:.72rem;
  letter-spacing:.18em;
}

/* ---------- 12 · 页脚 ---------- */
.bw-footer{
  position:relative;
  margin-top:clamp(48px,8vw,110px);
  background:var(--bw-night);
  border-top:1px solid var(--bw-line);
  color:var(--bw-cream);
}
.bw-footer__band{
  height:6px;
  background:linear-gradient(90deg,var(--bw-clay) 0%,var(--bw-moss) 32%,var(--bw-signal) 64%,var(--bw-blue) 100%);
}
.bw-footer__grid{
  display:grid;
  grid-template-columns:minmax(0,1.45fr) minmax(0,1fr) minmax(0,1.25fr);
  gap:clamp(24px,4vw,56px);
  padding-block:clamp(36px,5vw,64px) clamp(22px,3vw,34px);
}
.bw-footer__brand{display:grid;gap:12px;align-content:start;}
.bw-footer__name{
  font-size:1.5rem;
  font-weight:800;
  letter-spacing:.03em;
}
.bw-footer__tagline{
  font-family:var(--bw-font-mono);
  font-size:.8rem;
  letter-spacing:.16em;
  color:var(--bw-signal);
}
.bw-footer__note{
  font-size:.9rem;
  color:rgba(244,239,228,.72);
  max-width:44ch;
}
.bw-footer__col{display:grid;gap:14px;align-content:start;}
.bw-footer__col-title{
  font-family:var(--bw-font-mono);
  font-size:.72rem;
  font-weight:500;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--bw-mist);
}
.bw-footer__nav{display:block;}
.bw-footer__nav-list{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:8px 20px;
  list-style:none;
  margin:0;
  padding:0;
}
.bw-footer__nav-item{list-style:none;}
.bw-footer__nav-link{
  display:inline-block;
  font-size:.92rem;
  color:rgba(244,239,228,.78);
  text-decoration:none;
  padding-block:2px;
  border-bottom:1px solid transparent;
  transition:color .2s var(--bw-ease),border-color .2s var(--bw-ease);
}
.bw-footer__nav-link:hover{color:var(--bw-signal);border-color:rgba(230,255,63,.55);}
.bw-contact-list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:12px;
}
.bw-footer__contact{grid-template-columns:1fr;}
.bw-contact-list__item{display:grid;gap:2px;}
.bw-contact-list__label{
  font-family:var(--bw-font-mono);
  font-size:.68rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--bw-clay);
}
.bw-contact-list__value{
  font-size:.94rem;
  color:var(--bw-cream);
  word-break:break-word;
}
.bw-footer__hint{
  font-size:.84rem;
  color:var(--bw-mist);
  max-width:38ch;
}
.bw-footer__meta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  padding-block:18px 26px;
  border-top:1px solid var(--bw-line-soft);
  font-size:.78rem;
  color:rgba(168,181,160,.92);
}
.bw-footer__icp{letter-spacing:.12em;}
.bw-footer__copy{letter-spacing:.08em;}

/* ---------- 13 · 滚动显现 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(22px);
  transition:opacity .7s var(--bw-ease),transform .7s var(--bw-ease);
}
[data-reveal].is-visible{opacity:1;transform:none;}

/* ---------- 14 · 响应式 ---------- */
@media (max-width:1080px){
  .bw-quick{display:none;}
  .bw-header__cta{margin-left:auto;}
  .bw-nav-toggle{display:inline-flex;}
  .bw-nav{
    position:absolute;
    top:calc(100% + 1px);
    left:var(--bw-gutter);
    right:var(--bw-gutter);
    display:block;
    padding:10px;
    background:var(--bw-rock);
    border:1px solid var(--bw-line);
    border-radius:var(--bw-radius);
    box-shadow:0 26px 60px rgba(0,0,0,.55);
    max-height:70vh;
    overflow-y:auto;
    visibility:hidden;
    opacity:0;
    transform:translateY(-10px);
    pointer-events:none;
    transition:opacity .28s var(--bw-ease),transform .28s var(--bw-ease),visibility .28s linear;
  }
  .bw-nav[data-open]{
    visibility:visible;
    opacity:1;
    transform:none;
    pointer-events:auto;
  }
  .bw-nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:2px;
    counter-reset:bwnav;
  }
  .bw-nav__item{counter-increment:bwnav;}
  .bw-nav__link{
    display:block;
    padding:12px 14px 12px 46px;
    font-size:1rem;
    border-radius:var(--bw-radius-sm);
  }
  .bw-nav__link::before{
    content:counter(bwnav,decimal-leading-zero);
    position:absolute;
    left:14px;
    top:50%;
    transform:translateY(-50%);
    font-family:var(--bw-font-mono);
    font-size:.72rem;
    letter-spacing:.14em;
    color:var(--bw-clay);
  }
  .bw-nav__link[aria-current="page"]::after{left:14px;right:14px;bottom:6px;}
}
@media (max-width:980px){
  .bw-grid--2,
  .bw-grid--3,
  .bw-grid--asym,
  .bw-grid--asym-r,
  .bw-grid--sidebar{grid-template-columns:minmax(0,1fr);}
  .bw-footer__grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .bw-footer__brand{grid-column:1 / -1;}
}
@media (max-width:640px){
  .bw-brand__sub{letter-spacing:.16em;}
  .bw-header__cta{padding:8px 14px;font-size:.8rem;}
  .bw-nav-toggle__label{display:none;}
  .bw-chapter{grid-template-columns:minmax(0,1fr);gap:6px;}
  .bw-chapter__num{padding-top:0;}
  .bw-footer__grid{grid-template-columns:minmax(0,1fr);}
  .bw-footer__nav-list{grid-template-columns:minmax(0,1fr);}
  .bw-index__link{grid-template-columns:auto minmax(0,1fr);}
  .bw-index__meta{grid-column:2;white-space:normal;}
}

/* ---------- 15 · 动效降级 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal]{opacity:1 !important;transform:none !important;}
  .bw-progress__bar{transition:none !important;}
}