/* ============================================================
   宝马娱乐馆 / baoma-zoom.com.cn — 共享样式 /assets/site.css
   夜间驾驶舱 · 数字车库 · 精密网格
   ============================================================ */

/* ---------- 1. 设计变量 ---------- */
:root{
  --bm-cockpit:#081826;
  --bm-deep:#102A43;
  --bm-gauge:#3A4652;
  --bm-silver:#C9D2DC;
  --bm-cream:#F4F1E8;
  --bm-blue:#2D9CFF;
  --bm-orange:#FF8A3D;
  --bm-cyan:#63D7E8;
  --bm-moss:#5C7A6A;
  --bm-clay:#C0663D;

  --bm-line:rgba(201,210,220,.16);
  --bm-line-2:rgba(201,210,220,.34);
  --bm-dim:rgba(201,210,220,.66);
  --bm-faint:rgba(201,210,220,.42);

  --bm-font-head:"HarmonyOS Sans SC","Noto Sans SC","PingFang SC",system-ui,sans-serif;
  --bm-font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC",system-ui,sans-serif;
  --bm-font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;

  --bm-shell:1320px;
  --bm-gutter:clamp(16px,4vw,44px);
  --bm-ease:cubic-bezier(.22,.61,.36,1);
  --bm-header-h:150px;
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--bm-header-h) + 16px);
}
body{
  margin:0;
  background-color:var(--bm-cockpit);
  background-image:
    radial-gradient(900px 520px at 10% -12%,rgba(45,156,255,.14),transparent 70%),
    radial-gradient(720px 440px at 94% 2%,rgba(255,138,61,.09),transparent 74%);
  background-repeat:no-repeat;
  color:var(--bm-cream);
  font-family:var(--bm-font-body);
  font-size:clamp(15px,1.2vw,18px);
  font-weight:400;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5{
  margin:0;
  font-family:var(--bm-font-head);
  font-weight:800;
  line-height:1.14;
  letter-spacing:-.012em;
}
p,ul,ol,dl,figure,blockquote{margin:0;}
ul,ol{padding:0;list-style:none;}
a{color:inherit;text-decoration:none;}
img,svg{display:block;max-width:100%;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
table{border-collapse:collapse;width:100%;}
strong{font-weight:700;color:var(--bm-cream);}
:focus-visible{
  outline:2px solid var(--bm-orange);
  outline-offset:3px;
  border-radius:1px;
}

/* ---------- 3. 骨架工具 ---------- */
.bm-shell{
  width:100%;
  max-width:var(--bm-shell);
  margin-inline:auto;
  padding-inline:var(--bm-gutter);
}
.bm-grid{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(16px,2vw,30px);
}
.bm-rail{grid-column:1 / span 3;align-self:start;}
.bm-flow{grid-column:4 / span 9;min-width:0;}
.bm-section{
  padding-block:clamp(40px,5.5vw,84px);
  border-top:1px solid var(--bm-line);
}
.bm-band{
  position:relative;
  padding-block:clamp(28px,4vw,56px);
  background:
    linear-gradient(180deg,rgba(16,42,67,.92),rgba(8,24,38,.92));
  border-block:1px solid var(--bm-line);
}
.bm-band::before{
  content:"";
  position:absolute;inset:0;
  background-image:
    linear-gradient(90deg,var(--bm-line) 1px,transparent 1px);
  background-size:80px 100%;
  opacity:.5;
  pointer-events:none;
}
.bm-band > *{position:relative;}

/* ---------- 4. 排版组件 ---------- */
.bm-display{
  font-family:var(--bm-font-head);
  font-weight:900;
  font-size:clamp(44px,7vw,112px);
  line-height:1.02;
  letter-spacing:-.02em;
}
.bm-section-head{
  display:grid;
  gap:12px;
  max-width:62ch;
  margin-bottom:clamp(22px,3vw,40px);
}
.bm-eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--bm-font-mono);
  font-size:12px;
  font-weight:600;
  letter-spacing:.26em;
  text-transform:uppercase;
  color:var(--bm-cyan);
}
.bm-eyebrow::before{
  content:"";
  width:22px;height:1px;
  background:var(--bm-orange);
}
.bm-lead{
  font-size:clamp(15px,1.25vw,18px);
  color:var(--bm-dim);
  max-width:56ch;
}
.bm-note{
  font-family:var(--bm-font-mono);
  font-size:11.5px;
  letter-spacing:.14em;
  color:var(--bm-faint);
}
.bm-mono{
  font-family:var(--bm-font-mono);
  font-size:11.5px;
  font-weight:500;
  letter-spacing:.26em;
  text-transform:uppercase;
  color:var(--bm-faint);
}
.bm-rule{
  display:block;
  width:56px;height:2px;
  background:linear-gradient(90deg,var(--bm-orange),rgba(255,138,61,0));
  border:0;
  margin-block:18px;
}

/* ---------- 5. 按钮 ---------- */
.bm-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:12px 20px;
  font-family:var(--bm-font-mono);
  font-size:12px;
  font-weight:600;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--bm-cream);
  background:transparent;
  border:1px solid var(--bm-line-2);
  border-radius:1px;
  transition:background-color .2s var(--bm-ease),
             border-color .2s var(--bm-ease),
             color .2s var(--bm-ease),
             transform .2s var(--bm-ease);
}
.bm-btn:hover{border-color:var(--bm-cyan);color:#fff;}
.bm-btn:active{transform:translateY(1px);}
.bm-btn--accent{
  background:linear-gradient(120deg,var(--bm-orange),#FF6B1F);
  border-color:transparent;
  color:#0A1520;
  font-weight:700;
  box-shadow:0 0 0 1px rgba(255,138,61,.28),0 14px 30px -18px rgba(255,138,61,.9);
}
.bm-btn--accent:hover{
  color:#0A1520;
  filter:brightness(1.08);
}
.bm-btn--ghost{
  border-color:var(--bm-line);
  color:var(--bm-silver);
}
.bm-btn--ghost:hover{border-color:var(--bm-cyan);color:var(--bm-cream);}
.bm-btn--sm{padding:9px 15px;font-size:11px;letter-spacing:.14em;}

/* ---------- 6. 标签 / 状态 ---------- */
.bm-badge{
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:4px 10px;
  border:1px solid var(--bm-line-2);
  border-radius:999px;
  font-family:var(--bm-font-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--bm-silver);
}
.bm-badge::before{
  content:"";
  width:6px;height:6px;border-radius:50%;
  background:var(--bm-cyan);
  box-shadow:0 0 8px rgba(99,215,232,.9);
}

/* ---------- 7. 媒体容器（图片占位） ---------- */
.bm-media{
  position:relative;
  display:block;
  margin:0;
  overflow:hidden;
  aspect-ratio:16 / 9;
  border:1px solid var(--bm-line);
  background-color:var(--bm-deep);
  background-image:
    linear-gradient(135deg,rgba(45,156,255,.20),rgba(8,24,38,0) 52%),
    linear-gradient(315deg,rgba(255,138,61,.16),rgba(16,42,67,0) 56%),
    linear-gradient(180deg,rgba(58,70,82,.35),rgba(8,24,38,.9));
}
.bm-media::after{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(90deg,var(--bm-line) 1px,transparent 1px),
    linear-gradient(var(--bm-line) 1px,transparent 1px);
  background-size:48px 48px;
  opacity:.42;
  pointer-events:none;
}
.bm-media img{
  position:relative;
  z-index:1;
  width:100%;height:100%;
  object-fit:cover;
}
.bm-media--wide{aspect-ratio:21 / 9;}
.bm-media--tall{aspect-ratio:4 / 5;}
.bm-media--square{aspect-ratio:1 / 1;}
.bm-media__caption{
  position:absolute;
  z-index:2;
  left:0;right:0;bottom:0;
  padding:26px 16px 12px;
  font-family:var(--bm-font-mono);
  font-size:11.5px;
  letter-spacing:.12em;
  color:var(--bm-silver);
  background:linear-gradient(180deg,rgba(8,24,38,0),rgba(8,24,38,.92));
}

/* ---------- 8. 左侧锚点轨 ---------- */
.bm-rail__list{
  display:grid;
  gap:2px;
  border-left:1px solid var(--bm-line);
}
.bm-rail__link{
  display:flex;
  align-items:baseline;
  gap:10px;
  padding:10px 0 10px 16px;
  margin-left:-1px;
  border-left:2px solid transparent;
  font-family:var(--bm-font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--bm-faint);
  transition:color .18s var(--bm-ease),border-color .18s var(--bm-ease);
}
.bm-rail__link:hover{color:var(--bm-cream);}
.bm-rail__link.is-active,
.bm-rail__link[aria-current="true"]{
  color:var(--bm-cream);
  border-left-color:var(--bm-orange);
}
.bm-rail__label{
  font-family:var(--bm-font-body);
  font-size:14px;
  letter-spacing:.06em;
}
.bm-rail__meta{
  display:block;
  padding:12px 0 0 16px;
  font-family:var(--bm-font-mono);
  font-size:11px;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:rgba(201,210,220,.34);
}

/* ---------- 9. 标签页 / 分段切换 ---------- */
.bm-tabs{
  display:flex;
  flex-wrap:wrap;
  gap:2px;
  border-bottom:1px solid var(--bm-line);
  margin-bottom:clamp(18px,2.4vw,30px);
}
.bm-tab{
  position:relative;
  padding:12px 18px;
  font-family:var(--bm-font-mono);
  font-size:12px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--bm-dim);
  border:1px solid transparent;
  border-bottom:2px solid transparent;
  transition:color .18s var(--bm-ease),border-color .18s var(--bm-ease);
}
.bm-tab:hover{color:var(--bm-cream);}
.bm-tab.is-active,
.bm-tab[aria-selected="true"]{
  color:var(--bm-cream);
  border-bottom-color:var(--bm-orange);
  background:linear-gradient(180deg,rgba(45,156,255,.10),transparent);
}
.bm-tabpanel{padding-block:4px;}
.bm-tabpanel[hidden]{display:none;}

/* ---------- 10. 步骤条 ---------- */
.bm-steps{display:grid;gap:14px;}
.bm-step{
  display:grid;
  grid-template-columns:auto 1fr;
  gap:14px;
  padding:16px 18px;
  border:1px solid var(--bm-line);
  background:linear-gradient(120deg,rgba(16,42,67,.7),rgba(8,24,38,.4));
}
.bm-step__index{
  font-family:var(--bm-font-mono);
  font-size:12px;
  font-weight:600;
  letter-spacing:.16em;
  color:var(--bm-cyan);
  padding-top:3px;
}

/* ---------- 11. 面包屑 ---------- */
.bm-crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--bm-font-mono);
  font-size:11.5px;
  letter-spacing:.14em;
  color:var(--bm-faint);
}
.bm-crumbs a{color:var(--bm-dim);transition:color .18s var(--bm-ease);}
.bm-crumbs a:hover{color:var(--bm-cyan);}
.bm-crumbs__item::after{
  content:"/";
  margin-left:8px;
  color:rgba(201,210,220,.3);
}
.bm-crumbs__item:last-child::after{content:"";}

/* ---------- 12. 显现 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .5s var(--bm-ease),transform .5s var(--bm-ease);
}
[data-reveal].is-in{opacity:1;transform:none;}

/* ---------- 13. 跳过链接 ---------- */
.bm-skip{
  position:absolute;
  top:0;left:0;
  z-index:200;
  display:inline-block;
  padding:12px 20px;
  font-family:var(--bm-font-mono);
  font-size:12px;
  letter-spacing:.16em;
  background:var(--bm-orange);
  color:#0A1520;
  font-weight:700;
  transform:translateY(-140%);
  transition:transform .2s var(--bm-ease);
}
.bm-skip:focus-visible{transform:translateY(0);}

/* ============================================================
   14. 页头
   ============================================================ */
.bm-header{
  position:relative;
  z-index:80;
  background:linear-gradient(180deg,rgba(16,42,67,.97),rgba(8,24,38,.99));
  border-bottom:1px solid var(--bm-line);
  box-shadow:0 1px 0 rgba(99,215,232,.14),0 24px 48px -36px #000;
}
.bm-progress{
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  background:rgba(201,210,220,.08);
  overflow:hidden;
  pointer-events:none;
}
.bm-progress__bar{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--bm-cyan),var(--bm-blue) 55%,var(--bm-orange));
}

.bm-topbar__inner{
  display:flex;
  align-items:center;
  gap:clamp(12px,2vw,28px);
  padding-block:14px;
}
.bm-brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  flex:none;
}
.bm-brand__mark{
  position:relative;
  display:block;
  width:34px;height:34px;
  border:1px solid var(--bm-line-2);
  background:linear-gradient(140deg,rgba(45,156,255,.24),rgba(8,24,38,0) 62%);
  flex:none;
}
.bm-brand__slash{
  position:absolute;
  top:8px;left:8px;
  width:6px;height:18px;
  background:var(--bm-cyan);
  transform:skewX(-18deg);
}
.bm-brand__slash--alt{
  top:14px;left:18px;
  height:12px;
  background:var(--bm-orange);
}
.bm-brand__text{display:grid;gap:2px;}
.bm-brand__name{
  font-family:var(--bm-font-head);
  font-weight:900;
  font-size:clamp(17px,1.6vw,20px);
  letter-spacing:.06em;
  line-height:1.2;
  color:var(--bm-cream);
}
.bm-brand__descriptor{
  font-family:var(--bm-font-mono);
  font-size:10.5px;
  letter-spacing:.2em;
  color:var(--bm-faint);
  line-height:1.4;
}

.bm-status{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:9px;
  margin-left:auto;
  padding-left:18px;
  border-left:1px solid var(--bm-line);
  font-family:var(--bm-font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--bm-dim);
}
.bm-status__dot{
  width:7px;height:7px;
  border-radius:50%;
  background:var(--bm-cyan);
  box-shadow:0 0 10px rgba(99,215,232,.9);
  animation:bm-pulse 3.2s ease-in-out infinite;
}
.bm-status__div{color:rgba(201,210,220,.28);}
.bm-status__text{white-space:nowrap;}
@keyframes bm-pulse{
  0%,100%{opacity:1;}
  50%{opacity:.42;}
}

.bm-nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  margin-left:auto;
  padding:9px 12px;
  border:1px solid var(--bm-line-2);
  border-radius:1px;
  background:rgba(8,24,38,.6);
}
.bm-nav-toggle__bars{
  position:relative;
  display:inline-block;
  width:22px;height:16px;
}
.bm-nav-toggle__bars i{
  position:absolute;
  left:0;
  width:100%;height:2px;
  background:var(--bm-cream);
  transition:transform .2s var(--bm-ease),opacity .2s var(--bm-ease),width .2s var(--bm-ease);
}
.bm-nav-toggle__bars i:nth-child(1){top:0;}
.bm-nav-toggle__bars i:nth-child(2){top:7px;width:66%;background:var(--bm-orange);}
.bm-nav-toggle__bars i:nth-child(3){top:14px;}
.bm-nav-toggle__label{
  font-family:var(--bm-font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--bm-silver);
}
.bm-header[data-open] .bm-nav-toggle__bars i:nth-child(1){transform:translateY(7px) rotate(45deg);}
.bm-header[data-open] .bm-nav-toggle__bars i:nth-child(2){opacity:0;}
.bm-header[data-open] .bm-nav-toggle__bars i:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

.bm-navbar{border-top:1px solid var(--bm-line);}
.bm-navbar__inner{display:flex;}
.bm-nav{
  display:flex;
  align-items:center;
  gap:clamp(6px,1.4vw,26px);
  width:100%;
  padding-block:10px;
}
.bm-nav__list{
  display:flex;
  align-items:center;
  gap:2px;
  flex-wrap:wrap;
}
.bm-nav__item{display:block;}
.bm-nav__link{
  position:relative;
  display:inline-flex;
  align-items:baseline;
  gap:7px;
  padding:9px 13px;
  font-size:14.5px;
  letter-spacing:.05em;
  color:var(--bm-dim);
  transition:color .18s var(--bm-ease);
}
.bm-nav__link::after{
  content:"";
  position:absolute;
  left:13px;right:13px;bottom:2px;
  height:2px;
  background:var(--bm-orange);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .22s var(--bm-ease);
}
.bm-nav__link:hover{color:var(--bm-cream);}
.bm-nav__link:hover::after{transform:scaleX(1);}
.bm-nav__link[aria-current="page"]{
  color:var(--bm-cream);
  font-weight:500;
}
.bm-nav__link[aria-current="page"]::after{transform:scaleX(1);}
.bm-nav__num{
  font-family:var(--bm-font-mono);
  font-size:10.5px;
  letter-spacing:.1em;
  color:rgba(201,210,220,.38);
}
.bm-nav__link[aria-current="page"] .bm-nav__num{color:var(--bm-cyan);}
.bm-nav__aside{
  display:flex;
  align-items:center;
  gap:14px;
  margin-left:auto;
  padding-left:14px;
  border-left:1px solid var(--bm-line);
}
.bm-nav__meta{
  font-family:var(--bm-font-mono);
  font-size:10.5px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:rgba(201,210,220,.42);
  white-space:nowrap;
}

/* ============================================================
   15. 页脚
   ============================================================ */
.bm-footer{
  position:relative;
  margin-top:clamp(40px,6vw,90px);
  background:linear-gradient(180deg,rgba(16,42,67,.85),rgba(8,24,38,1));
  border-top:1px solid var(--bm-line);
}
.bm-footer__rail{
  overflow:hidden;
  border-bottom:1px solid var(--bm-line);
  background:linear-gradient(90deg,rgba(45,156,255,.12),rgba(255,138,61,.08));
}
.bm-footer__rail-text{
  display:block;
  padding-block:10px;
  white-space:nowrap;
  font-family:var(--bm-font-mono);
  font-size:11px;
  letter-spacing:.34em;
  text-transform:uppercase;
  color:rgba(201,210,220,.5);
}
.bm-footer__inner{padding-block:clamp(34px,5vw,64px) 0;}
.bm-footer__grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.5fr;
  gap:clamp(24px,3vw,48px);
  align-items:start;
}
.bm-footer__brand{display:grid;gap:14px;align-content:start;}
.bm-footer__logo{
  font-family:var(--bm-font-head);
  font-weight:900;
  font-size:clamp(20px,2vw,26px);
  letter-spacing:.08em;
  color:var(--bm-cream);
}
.bm-footer__summary{
  font-size:14.5px;
  line-height:1.8;
  color:var(--bm-dim);
  max-width:34ch;
}
.bm-footer__tag{display:flex;gap:10px;flex-wrap:wrap;}
.bm-footer__col{display:grid;gap:12px;align-content:start;}
.bm-footer__heading{
  font-family:var(--bm-font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--bm-cyan);
  padding-left:12px;
  position:relative;
}
.bm-footer__heading::before{
  content:"";
  position:absolute;
  left:0;top:.55em;
  width:5px;height:1px;
  background:var(--bm-orange);
}
.bm-footer__list{display:grid;gap:2px;}
.bm-footer__link{
  display:inline-block;
  padding-block:4px;
  font-size:14.5px;
  color:var(--bm-dim);
  box-shadow:inset 0 -1px 0 rgba(255,138,61,0);
  transition:color .18s var(--bm-ease),box-shadow .18s var(--bm-ease);
}
.bm-footer__link:hover{
  color:var(--bm-cream);
  box-shadow:inset 0 -1px 0 rgba(255,138,61,.9);
}
.bm-footer__list--contact{display:grid;gap:10px;}
.bm-footer__contact{
  display:grid;
  grid-template-columns:44px 1fr;
  gap:10px;
  align-items:baseline;
}
.bm-footer__label{
  font-family:var(--bm-font-mono);
  font-size:10.5px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:rgba(201,210,220,.4);
}
.bm-footer__value{
  font-size:14px;
  color:var(--bm-silver);
  line-height:1.7;
  word-break:break-word;
}
.bm-footer__note{
  margin-top:12px;
  font-size:12.5px;
  line-height:1.8;
  color:var(--bm-faint);
  max-width:38ch;
}
.bm-copy{
  display:inline-flex;
  align-items:center;
  flex-wrap:wrap;
  gap:8px;
}
.bm-copy__value{
  font-family:var(--bm-font-mono);
  font-size:13px;
  letter-spacing:.04em;
  color:var(--bm-silver);
  word-break:break-all;
}
.bm-copy__btn{
  padding:3px 9px;
  font-family:var(--bm-font-mono);
  font-size:10.5px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--bm-cyan);
  border:1px solid rgba(99,215,232,.45);
  border-radius:1px;
  transition:background-color .18s var(--bm-ease),color .18s var(--bm-ease);
}
.bm-copy__btn:hover{background:rgba(99,215,232,.14);color:#fff;}
.bm-copy__status{
  font-family:var(--bm-font-mono);
  font-size:10.5px;
  letter-spacing:.12em;
  color:var(--bm-orange);
  min-height:1em;
}
.bm-footer__bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  margin-top:clamp(28px,4vw,48px);
  padding-block:18px 26px;
  border-top:1px solid var(--bm-line);
  font-family:var(--bm-font-mono);
  font-size:11.5px;
  letter-spacing:.12em;
  color:rgba(201,210,220,.55);
}
.bm-footer__icp{color:rgba(201,210,220,.45);}

/* ============================================================
   16. 响应式
   ============================================================ */
@media (min-width:901px){
  .bm-header{position:sticky;top:0;}
}

@media (max-width:1024px){
  .bm-status{display:none;}
  .bm-rail{grid-column:1 / -1;position:static;}
  .bm-flow{grid-column:1 / -1;}
  .bm-rail__list{
    display:flex;
    flex-wrap:wrap;
    gap:6px;
    border-left:0;
    padding-bottom:6px;
  }
  .bm-rail__link{
    border-left:0;
    border-bottom:2px solid transparent;
    margin-left:0;
    padding:8px 12px;
  }
  .bm-rail__link.is-active,
  .bm-rail__link[aria-current="true"]{
    border-left-color:transparent;
    border-bottom-color:var(--bm-orange);
  }
  .bm-rail__meta{display:none;}
  .bm-footer__grid{grid-template-columns:1fr 1fr;}
}

@media (max-width:900px){
  :root{--bm-header-h:96px;}
  html{scroll-padding-top:100px;}
  .bm-nav-toggle{display:inline-flex;}
  .bm-nav{
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:10px 0 22px;
    border-top:1px solid var(--bm-line);
  }
  .bm-header[data-open] .bm-nav{display:flex;}
  .bm-nav__list{flex-direction:column;align-items:stretch;gap:0;}
  .bm-nav__link{
    display:flex;
    align-items:baseline;
    padding:14px 4px;
    font-size:16px;
    border-bottom:1px solid var(--bm-line);
  }
  .bm-nav__link::after{left:0;right:auto;width:100%;bottom:0;transform-origin:left center;}
  .bm-nav__aside{
    margin-left:0;
    margin-top:16px;
    padding-left:0;
    border-left:0;
    flex-direction:column;
    align-items:stretch;
    gap:12px;
  }
  .bm-nav__meta{text-align:left;}
  .bm-nav__aside .bm-btn{width:100%;}
  .bm-topbar__inner{padding-block:11px;}
  .bm-brand__descriptor{display:none;}
}

@media (max-width:640px){
  .bm-footer__grid{grid-template-columns:1fr;gap:26px;}
  .bm-footer__summary{max-width:none;}
  .bm-footer__note{max-width:none;}
  .bm-tab{padding:10px 12px;font-size:11px;}
  .bm-step{grid-template-columns:1fr;gap:6px;}
}

/* ---------- 17. 无障碍：减弱动效 ---------- */
@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;
  }
  [data-reveal]{opacity:1;transform:none;}
  .bm-progress__bar{transition:none;}
}

/* ---------- 18. 打印 ---------- */
@media print{
  .bm-header,.bm-footer,.bm-skip,.bm-progress{display:none !important;}
  body{background:#fff;color:#0A1520;}
}