/* =====================================================================
   site.css · 欧博ABG 共享外壳
   01 令牌 / 02 重置 / 03 排版 / 04 布局 / 05 通用组件 / 06 页头
   07 页脚 / 08 工具类 / 09 响应式 / 10 无障碍与动效降级
   ===================================================================== */

/* ---------- 01 令牌 ---------- */
:root{
  --ink:#07131F;
  --ink-2:#0E2233;
  --ink-3:#132B3F;
  --paper:#F2E7D5;
  --paper-warm:#E4D4BC;
  --brown:#241B16;
  --signal:#F26A2E;
  --terracotta:#A93410;
  --grey:#9AA8B6;
  --teal:#167A6A;
  --teal-soft:#9BC9BF;

  --line-ink:rgba(242,231,213,.16);
  --line-ink-strong:rgba(242,231,213,.34);
  --line-paper:rgba(36,27,22,.18);
  --line-teal:rgba(155,201,191,.36);

  --text-ink:var(--paper);
  --text-dim:rgba(242,231,213,.74);
  --text-mute:var(--grey);

  --font-display:'Archivo Narrow','Roboto Condensed','Arial Narrow',sans-serif;
  --font-mono:'IBM Plex Mono','SFMono-Regular',Consolas,'Courier New',monospace;
  --font-body:'Noto Sans SC','Source Han Sans SC','PingFang SC','Microsoft YaHei',sans-serif;

  --wrap:1240px;
  --gut:clamp(16px,4vw,40px);
  --gap:clamp(14px,1.8vw,26px);
  --ease:cubic-bezier(.22,.7,.2,1);
  --dur:.18s;
  --header-h:72px;
}

/* ---------- 02 重置 ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  min-height:100vh;
  background-color:var(--ink);
  background-image:
    linear-gradient(rgba(242,231,213,.032) 1px,transparent 1px),
    linear-gradient(90deg,rgba(242,231,213,.032) 1px,transparent 1px);
  background-size:72px 72px;
  color:var(--text-ink);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0;}
ul,ol{margin:0;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%;}
::selection{background:var(--signal);color:#140B06;}

/* ---------- 03 排版 ---------- */
h1,.h1{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(32px,5vw,64px);
  line-height:1.04;
  letter-spacing:-.02em;
}
h2,.h2{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(24px,3.2vw,44px);
  line-height:1.1;
  letter-spacing:-.02em;
}
h3,.h3{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(19px,2.1vw,26px);
  line-height:1.2;
  letter-spacing:-.01em;
}
h4,.h4{
  font-family:var(--font-display);
  font-weight:700;
  font-size:17px;
  line-height:1.35;
  letter-spacing:0;
}
p{max-width:36em;}
strong{font-weight:700;}

.lede{
  font-size:clamp(15px,1.3vw,18px);
  line-height:1.85;
  color:var(--text-dim);
  max-width:34em;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:600;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--teal-soft);
}
.eyebrow::before{
  content:"";
  width:30px;
  height:1px;
  background:currentColor;
  flex:0 0 auto;
}

/* ---------- 04 布局 ---------- */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gut);
}
.section{padding-block:clamp(36px,5.5vw,80px);}
.section__head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:20px;
  flex-wrap:wrap;
  padding-bottom:14px;
  border-bottom:1px solid var(--line-ink);
  margin-bottom:clamp(20px,3vw,34px);
}
.section__title{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(22px,2.8vw,36px);
  line-height:1.1;
  letter-spacing:-.02em;
}
.grid{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:var(--gap);
}
.col-3{grid-column:span 3;}
.col-4{grid-column:span 4;}
.col-5{grid-column:span 5;}
.col-6{grid-column:span 6;}
.col-7{grid-column:span 7;}
.col-8{grid-column:span 8;}
.col-9{grid-column:span 9;}
.col-12{grid-column:span 12;}

/* ---------- 05 通用组件 ---------- */
/* 按钮 */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:13px 20px;
  border:1px solid transparent;
  border-radius:0;
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:600;
  letter-spacing:.06em;
  line-height:1.2;
  text-align:center;
  transition:background-color var(--dur) var(--ease),
             border-color var(--dur) var(--ease),
             color var(--dur) var(--ease);
}
.btn--sm{padding:9px 14px;font-size:12px;letter-spacing:.05em;}
.btn--signal{background:var(--signal);border-color:var(--signal);color:#160C06;}
.btn--signal:hover{background:#FF7E45;border-color:#FF7E45;}
.btn--ghost{border-color:var(--line-ink-strong);color:var(--paper);}
.btn--ghost:hover{border-color:var(--teal-soft);color:var(--teal-soft);}
.btn--line{
  border-color:var(--line-paper);
  color:var(--terracotta);
  padding:11px 16px;
  background:transparent;
}
.btn--line:hover{border-color:var(--terracotta);}

/* 文字链接：悬停只改变下划线长度 */
.link-arrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding-bottom:3px;
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:600;
  letter-spacing:.05em;
  background-image:linear-gradient(currentColor,currentColor);
  background-repeat:no-repeat;
  background-position:0 100%;
  background-size:100% 1px;
  transition:background-size var(--dur) var(--ease),color var(--dur) var(--ease);
}
.link-arrow::after{content:"→";font-size:12px;}
.link-arrow:hover{background-size:42% 1px;}

/* 模块面板 */
.panel{
  position:relative;
  background:var(--ink-2);
  border:1px solid var(--line-ink);
  padding:clamp(18px,2.2vw,28px);
}
.panel--paper{
  background:var(--paper);
  border-color:var(--line-paper);
  color:var(--brown);
}
.panel--warm{
  background:var(--paper-warm);
  border-color:var(--line-paper);
  color:var(--brown);
}
.panel--paper .lede,
.panel--warm .lede{color:rgba(36,27,22,.78);}
.panel--paper .note,
.panel--warm .note{color:rgba(36,27,22,.72);}
.panel--paper .tag--teal,
.panel--warm .tag--teal{color:var(--teal);border-color:var(--teal);}
.panel--paper .tag--signal,
.panel--warm .tag--signal{color:var(--terracotta);border-color:var(--terracotta);}
.panel--paper .index-list,
.panel--warm .index-list{border-top-color:var(--line-paper);}
.panel--paper .index-list__item,
.panel--warm .index-list__item{border-bottom-color:var(--line-paper);}
.panel--paper .index-list__num,
.panel--warm .index-list__num{color:var(--terracotta);}

/* 标签 */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 8px;
  border:1px solid currentColor;
  border-radius:0;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.08em;
  line-height:1.6;
  white-space:nowrap;
}
.tag--teal{color:var(--teal-soft);}
.tag--signal{color:var(--signal);}
.tag--grey{color:var(--grey);}

/* 编号目录 */
.index-list{display:grid;border-top:1px solid var(--line-ink);}
.index-list__item{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:baseline;
  gap:14px;
  padding:12px 2px;
  border-bottom:1px solid var(--line-ink);
}
.index-list__num{
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:600;
  letter-spacing:.06em;
  color:var(--teal-soft);
}
.index-list__label{
  font-size:15px;
  line-height:1.6;
  min-width:0;
}

/* 旁注 */
.note{
  padding-left:14px;
  border-left:2px solid var(--signal);
  font-size:14px;
  line-height:1.8;
  color:var(--text-dim);
  max-width:34em;
}

/* 细线 */
.rule{height:1px;background:var(--line-ink);border:0;margin:0;}

/* 图片容器 */
.media{
  position:relative;
  margin:0;
  background:var(--ink-2);
  border:1px solid var(--line-ink);
}
.media__frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16 / 10;
  background:
    radial-gradient(circle at 24% 22%,rgba(22,122,106,.32),transparent 58%),
    radial-gradient(circle at 78% 76%,rgba(242,106,46,.22),transparent 62%),
    linear-gradient(140deg,var(--ink-3),var(--ink));
}
.media__frame::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:2;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(242,231,213,.10) 1px,transparent 1px),
    linear-gradient(90deg,rgba(242,231,213,.10) 1px,transparent 1px);
  background-size:28px 28px;
}
.media__frame::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:3;
  pointer-events:none;
  opacity:.42;
  background-image:repeating-linear-gradient(0deg,rgba(7,19,31,.55) 0 1px,transparent 1px 3px);
}
.media__img{
  position:relative;
  z-index:1;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media__caption{
  padding:9px 12px;
  border-top:1px solid var(--line-ink);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--grey);
}
.media--wide .media__frame{aspect-ratio:21 / 9;}
.media--tall .media__frame{aspect-ratio:4 / 5;}
.media--square .media__frame{aspect-ratio:1 / 1;}
.media--paper{border-color:var(--line-paper);}
.media--paper .media__frame{background:linear-gradient(140deg,var(--paper-warm),var(--paper));}
.media--paper .media__frame::before{
  background-image:
    linear-gradient(rgba(36,27,22,.12) 1px,transparent 1px),
    linear-gradient(90deg,rgba(36,27,22,.12) 1px,transparent 1px);
}
.media--paper .media__caption{border-top-color:var(--line-paper);color:rgba(36,27,22,.62);}

/* 面包屑 */
.breadcrumbs{
  padding-block:18px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--grey);
}
.breadcrumbs__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;}
.breadcrumbs__item{display:inline-flex;align-items:center;gap:8px;}
.breadcrumbs__item:not(:last-child)::after{content:"/";color:rgba(154,168,182,.55);}
.breadcrumbs__link{transition:color var(--dur) var(--ease);}
.breadcrumbs__link:hover{color:var(--paper);}
.breadcrumbs__current{color:var(--paper);}

/* 分段切换 */
.tabs{display:block;}
.tab-list{
  display:flex;
  flex-wrap:wrap;
  gap:0;
  border-bottom:1px solid var(--line-ink);
  margin-bottom:clamp(18px,2.4vw,28px);
}
.tab{
  margin-bottom:-1px;
  padding:11px 16px;
  border-bottom:2px solid transparent;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:600;
  letter-spacing:.08em;
  color:var(--grey);
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.tab:hover{color:var(--paper);}
.tab[aria-selected="true"]{
  color:var(--paper);
  border-bottom-color:var(--signal);
}
.tab-panel{padding-top:0;}
.tab-panel[hidden]{display:none;}
.tab-panel:not([hidden]){animation:tabIn 180ms var(--ease) both;}
@keyframes tabIn{
  from{opacity:0;transform:translateY(6px);}
  to{opacity:1;transform:translateY(0);}
}

/* 折叠明细 */
.disclosure{
  border:1px solid var(--line-ink);
  background:var(--ink-2);
}
.disclosure + .disclosure{border-top:0;}
.disclosure__btn{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  width:100%;
  padding:15px 16px;
  text-align:left;
  font-size:15px;
  font-weight:500;
  color:var(--paper);
}
.disclosure__btn::after{
  content:"+";
  font-family:var(--font-mono);
  font-size:16px;
  color:var(--teal-soft);
  flex:0 0 auto;
}
.disclosure__btn[aria-expanded="true"]::after{content:"–";color:var(--signal);}
.disclosure__body{
  padding:0 16px 18px;
  font-size:14px;
  line-height:1.85;
  color:var(--text-dim);
}
.disclosure__body[hidden]{display:none;}

/* ---------- 06 页头 ---------- */
.skip-link{
  position:absolute;
  left:16px;
  top:-72px;
  z-index:200;
  padding:10px 16px;
  background:var(--signal);
  color:#160C06;
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:600;
  letter-spacing:.06em;
  transition:top var(--dur) var(--ease);
}
.skip-link:focus{top:12px;}

.site-header{
  position:sticky;
  top:0;
  z-index:100;
  background:rgba(7,19,31,.94);
  border-bottom:1px solid var(--line-ink);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  transition:border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.site-header.is-scrolled{
  border-bottom-color:var(--line-ink-strong);
  box-shadow:0 12px 30px -22px rgba(0,0,0,.9);
}
.site-header__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:clamp(14px,2.4vw,36px);
  min-height:var(--header-h);
}
.scroll-progress{
  position:absolute;
  left:0;
  bottom:-1px;
  display:block;
  width:0;
  height:2px;
  background:var(--teal-soft);
  pointer-events:none;
}

.brand-lockup{display:flex;align-items:center;gap:12px;flex:0 0 auto;}
.brand-lockup__mark{
  position:relative;
  display:grid;
  place-items:center;
  width:46px;
  height:46px;
  background:var(--ink-2);
  border:1px solid rgba(242,231,213,.24);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:600;
  letter-spacing:.08em;
  transition:border-color var(--dur) var(--ease);
}
.brand-lockup__mark::after{
  content:"";
  position:absolute;
  right:-1px;
  bottom:-1px;
  width:10px;
  height:10px;
  background:var(--signal);
}
.brand-lockup:hover .brand-lockup__mark{border-color:var(--teal-soft);}
.brand-lockup__text{display:block;min-width:0;}
.brand-lockup__name{
  display:block;
  font-family:var(--font-display);
  font-size:19px;
  font-weight:800;
  line-height:1.2;
  letter-spacing:-.01em;
  color:var(--paper);
}
.brand-lockup__descriptor{
  display:block;
  margin-top:2px;
  font-family:var(--font-mono);
  font-size:10.5px;
  font-weight:500;
  letter-spacing:.12em;
  color:var(--grey);
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:9px 12px;
  border:1px solid var(--line-ink-strong);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.14em;
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--teal-soft);color:var(--teal-soft);}
.nav-toggle__bars{display:grid;gap:4px;width:16px;}
.nav-toggle__bars span{
  display:block;
  height:1px;
  background:currentColor;
  transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg);}

.site-nav{
  display:flex;
  align-items:center;
  justify-content:flex-end;
  gap:clamp(12px,2vw,30px);
  flex:1 1 auto;
  min-width:0;
}
.site-nav__list{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:clamp(10px,1.5vw,24px);
}
.site-nav__item{flex:0 0 auto;}
.site-nav__link{
  position:relative;
  display:inline-flex;
  align-items:baseline;
  gap:6px;
  padding:8px 0;
  font-size:14px;
  font-weight:500;
  color:rgba(242,231,213,.76);
  transition:color var(--dur) var(--ease);
}
.site-nav__text{display:inline-block;white-space:nowrap;}
.site-nav__index{
  font-family:var(--font-mono);
  font-size:10px;
  font-weight:600;
  letter-spacing:.06em;
  color:var(--grey);
  transition:color var(--dur) var(--ease);
}
.site-nav__link::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:1px;
  background:var(--teal-soft);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--dur) var(--ease);
}
.site-nav__link:hover{color:var(--paper);}
.site-nav__link:hover::after{transform:scaleX(1);}
.site-nav__link[aria-current="page"]{color:var(--paper);}
.site-nav__link[aria-current="page"] .site-nav__index{color:var(--teal-soft);}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1);height:2px;}

.header-actions{
  display:flex;
  align-items:center;
  gap:10px;
  margin-left:clamp(4px,1vw,14px);
  padding-left:clamp(12px,1.6vw,22px);
  border-left:1px solid var(--line-ink);
  flex:0 0 auto;
}

/* ---------- 07 页脚 ---------- */
.site-footer{
  margin-top:clamp(48px,7vw,96px);
  background:var(--ink-2);
  border-top:1px solid var(--line-ink);
}
.site-footer__inner{
  display:grid;
  grid-template-columns:minmax(0,4fr) minmax(0,8fr);
  gap:clamp(28px,4vw,60px);
  padding-block:clamp(34px,4.6vw,64px);
}
.footer-brand__name{
  display:flex;
  align-items:baseline;
  flex-wrap:wrap;
  gap:12px;
  font-family:var(--font-display);
  font-size:24px;
  font-weight:800;
  line-height:1.2;
  letter-spacing:-.01em;
  color:var(--paper);
  max-width:none;
}
.footer-brand__mark{
  font-family:var(--font-mono);
  font-size:10px;
  font-weight:600;
  letter-spacing:.18em;
  color:var(--teal-soft);
  border:1px solid var(--line-teal);
  padding:2px 6px;
  white-space:nowrap;
}
.footer-brand__desc{
  margin-top:16px;
  max-width:32em;
  font-size:14px;
  line-height:1.85;
  color:rgba(242,231,213,.72);
}
.footer-brand__meta{
  margin-top:16px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--grey);
}
.footer-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(18px,3vw,34px);
}
.footer-col__title{
  padding-bottom:10px;
  margin-bottom:14px;
  border-bottom:1px solid var(--line-teal);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--teal-soft);
}
.footer-col__list{display:grid;gap:10px;}
.footer-col__link{
  display:inline-block;
  padding-bottom:2px;
  font-size:14px;
  color:rgba(242,231,213,.78);
  background-image:linear-gradient(currentColor,currentColor);
  background-repeat:no-repeat;
  background-position:0 100%;
  background-size:0 1px;
  transition:background-size var(--dur) var(--ease),color var(--dur) var(--ease);
}
.footer-col__link:hover{color:var(--paper);background-size:100% 1px;}
.site-footer__bar{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:12px 24px;
  padding-block:18px 26px;
  border-top:1px solid var(--line-ink);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.04em;
  color:var(--grey);
}
.site-footer__contact{max-width:62ch;line-height:1.8;}
.site-footer__legal{white-space:nowrap;}

/* ---------- 08 工具类 ---------- */
.u-mono{font-family:var(--font-mono);letter-spacing:.04em;}
.u-dim{color:var(--text-dim);}
.u-mute{color:var(--grey);}
.u-signal{color:var(--signal);}
.u-teal{color:var(--teal-soft);}
.u-visually-hidden{
  position:absolute;
  width:1px;
  height:1px;
  margin:-1px;
  padding:0;
  overflow:hidden;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  white-space:nowrap;
  border:0;
}

/* 进入显现（JS 生效后才隐藏） */
.js [data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
.js [data-reveal].is-visible{opacity:1;transform:none;}

/* ---------- 09 响应式 ---------- */
@media (max-width:1120px){
  .site-nav__index{display:none;}
}
@media (max-width:960px){
  :root{--header-h:64px;}
  .grid{grid-template-columns:repeat(6,minmax(0,1fr));}
  .col-3,.col-4,.col-5,.col-6{grid-column:span 3;}
  .col-7,.col-8,.col-9,.col-12{grid-column:span 6;}

  .nav-toggle{display:inline-flex;order:2;margin-left:auto;}
  .brand-lockup{order:1;}

  .site-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    display:flex;
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    gap:0;
    padding:8px var(--gut) 20px;
    background:var(--ink-2);
    border-bottom:1px solid var(--line-ink);
    border-top:1px solid var(--line-ink);
    box-shadow:0 24px 40px -30px rgba(0,0,0,.95);
    opacity:0;
    visibility:hidden;
    transform:translateY(-8px);
    transition:opacity var(--dur) var(--ease),
               transform var(--dur) var(--ease),
               visibility var(--dur) var(--ease);
  }
  .site-nav[data-open="true"]{
    opacity:1;
    visibility:visible;
    transform:translateY(0);
  }
  .site-nav > *{width:100%;max-width:var(--wrap);margin-inline:auto;}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0;}
  .site-nav__item{border-bottom:1px solid rgba(242,231,213,.10);}
  .site-nav__link{
    width:100%;
    padding:14px 12px;
    font-size:15px;
  }
  .site-nav__link::after{display:none;}
  .site-nav__index{display:inline;}
  .site-nav__link[aria-current="page"]{
    color:var(--paper);
    box-shadow:inset 2px 0 0 var(--teal-soft);
    background:rgba(22,122,106,.14);
  }
  .header-actions{
    margin:16px 0 0;
    padding:16px 0 0;
    border-left:0;
    border-top:1px solid rgba(242,231,213,.10);
  }
  .header-actions .btn{width:100%;}

  .site-footer__inner{grid-template-columns:minmax(0,1fr);}
}
@media (max-width:720px){
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr));}
  .site-footer__bar{flex-direction:column;align-items:flex-start;}
  .site-footer__legal{white-space:normal;}
}
@media (max-width:600px){
  .grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .col-3,.col-4,.col-5,.col-6,.col-7,.col-8,.col-9,.col-12{grid-column:span 2;}
  .brand-lockup__mark{width:40px;height:40px;font-size:12px;}
  .brand-lockup__name{font-size:17px;}
  .brand-lockup__descriptor{font-size:9.5px;letter-spacing:.08em;}
  .footer-cols{grid-template-columns:minmax(0,1fr);gap:22px;}
  .index-list__item{grid-template-columns:auto minmax(0,1fr);}
  .index-list__item > :last-child{grid-column:2;}
}

/* ---------- 10 无障碍与动效降级 ---------- */
:focus-visible{
  outline:2px solid var(--teal-soft);
  outline-offset:3px;
}
.btn--signal:focus-visible{outline-color:var(--paper);}
.panel--paper :focus-visible,
.panel--warm :focus-visible{outline-color:var(--terracotta);}

@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;
  }
  .js [data-reveal]{opacity:1;transform:none;transition:none;}
  .site-nav{transition:none;}
}