/* ==========================================================================
   果博东方中心 · Site Kit
   1 变量与重置 / 2 排版 / 3 布局工具 / 4 头部 / 5 页脚
   6 通用组件 / 7 响应式与无障碍
   ========================================================================== */

/* 1. 变量与重置 ---------------------------------------------------------- */
:root{
  --ink:#081827;
  --harbor:#102A44;
  --paper:#F2EEE5;
  --white:#FFFFFF;
  --amber:#E08A2E;
  --amber-deep:#A85E18;
  --celadon:#7FA89B;
  --celadon-deep:#4F6F66;
  --mist:#A9B8C8;
  --steel:#36516B;
  --rust:#B84A4A;

  --ink-soft:rgba(8,24,39,.74);
  --rule:rgba(8,24,39,.14);
  --rule-dark:rgba(54,81,107,.62);
  --amber-ghost:rgba(224,138,46,.14);
  --celadon-ghost:rgba(127,168,155,.14);

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

  --measure:1180px;
  --gutter:clamp(16px,4vw,44px);
  --rail-h:34px;
  --main-h:74px;
  --sp-lg:clamp(40px,7vw,88px);
  --sp-md:clamp(24px,4vw,44px);
  --sp-sm:clamp(14px,2vw,22px);
  --cut:18px;
}

*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--rail-h) + var(--main-h) + 18px);
}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg{max-width:100%;height:auto}
ul,ol{margin:0;padding:0}
::selection{background:var(--amber);color:var(--ink)}
:where(a,button,summary,[tabindex]):focus-visible{
  outline:2px solid var(--amber);
  outline-offset:3px;
  border-radius:2px;
}
#main-content:focus-visible{outline:2px solid var(--amber);outline-offset:-4px}

/* 2. 排版 ---------------------------------------------------------------- */
h1,h2,h3,h4,h5{
  font-family:var(--font-head);
  font-weight:800;
  letter-spacing:-.02em;
  line-height:1.16;
  margin:0 0 .55em;
  color:var(--ink);
  text-wrap:balance;
}
h1{font-size:clamp(2.25rem,4.6vw,3.5rem)}
h2{font-size:clamp(1.75rem,3.2vw,2.5rem)}
h3{font-size:clamp(1.25rem,2.2vw,1.75rem)}
h4{font-size:clamp(1.0625rem,1.5vw,1.25rem)}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
small{font-size:.8125rem}
strong{font-weight:700}
code,kbd,samp{font-family:var(--font-mono);font-size:.875em}
abbr[title]{text-decoration:underline dotted;cursor:help}

.prose{max-width:70ch;font-size:1rem;line-height:1.75}
.prose > *:first-child{margin-top:0}
.prose h2{font-size:clamp(1.5rem,2.6vw,2rem);margin-top:2.1em;padding-top:.5em;border-top:1px solid var(--rule)}
.prose h3{font-size:clamp(1.1875rem,1.9vw,1.375rem);margin-top:1.8em}
.prose ul,.prose ol{padding-left:1.3em;margin-bottom:1.15em}
.prose li{margin-bottom:.45em}
.prose li::marker{color:var(--amber-deep);font-family:var(--font-mono);font-size:.9em}
.prose a{
  color:var(--amber-deep);
  text-decoration:none;
  border-bottom:1px solid rgba(168,94,24,.4);
  transition:border-color .18s ease,color .18s ease;
}
.prose a:hover{border-bottom-color:var(--amber-deep);color:var(--ink)}
.prose strong{color:var(--ink)}
.prose code{background:rgba(8,24,39,.07);padding:.12em .42em;border-radius:2px;color:var(--harbor)}
.prose blockquote{
  margin:1.6em 0;
  padding:.2em 0 .2em 20px;
  border-left:3px solid var(--amber);
  color:var(--harbor);
  font-size:1.0625rem;
}
.prose hr{border:0;border-top:1px solid var(--rule);margin:2.4em 0}

/* 3. 布局工具 ------------------------------------------------------------ */
.wrap{
  width:100%;
  max-width:var(--measure);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.page-shell{
  max-width:var(--measure);
  margin-inline:auto;
  padding:clamp(28px,4.5vw,56px) var(--gutter) clamp(56px,8vw,96px);
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:.6875rem;
  font-weight:500;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--celadon-deep);
}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--amber);flex:none}
.lede{
  font-size:clamp(1rem,1.5vw,1.125rem);
  line-height:1.75;
  color:var(--ink-soft);
  max-width:64ch;
}
.grid{display:grid;gap:clamp(14px,2vw,26px)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(min(300px,100%),1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(min(240px,100%),1fr))}
.stack > * + *{margin-top:var(--sp-sm)}

.surface-dark{background:var(--ink);color:var(--paper)}
.surface-dark h1,.surface-dark h2,.surface-dark h3,.surface-dark h4{color:var(--white)}
.surface-dark .lede{color:var(--mist)}
.surface-dark .prose a{color:var(--amber)}
.surface-dark .prose a:hover{border-bottom-color:var(--amber);color:var(--white)}
.surface-dark .prose h2{border-top-color:var(--rule-dark)}
.surface-dark .eyebrow{color:var(--celadon)}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:6px 16px;
  padding-top:14px;
  border-top:1px solid var(--rule);
  margin-bottom:clamp(20px,3vw,32px);
}
.section-head__index{
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.16em;
  color:var(--amber-deep);
}
.section-head__title{margin:0;font-size:clamp(1.25rem,2.2vw,1.625rem)}
.section-head__note{margin:0;font-size:.9375rem;color:var(--ink-soft)}
.section-head--dark{border-top-color:var(--rule-dark)}
.section-head--dark .section-head__title{color:var(--white)}
.section-head--dark .section-head__note{color:var(--mist)}
.section-head--dark .section-head__index{color:var(--amber)}

/* 4. 头部 ---------------------------------------------------------------- */
.skip-link{
  position:fixed;
  left:16px;
  top:-80px;
  z-index:200;
  padding:11px 18px;
  background:var(--amber);
  color:var(--ink);
  font-family:var(--font-head);
  font-weight:700;
  font-size:.875rem;
  text-decoration:none;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%);
  transition:top .18s ease;
}
.skip-link:focus,.skip-link:focus-visible{top:12px}

.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--ink);
  color:var(--white);
  border-bottom:1px solid var(--rule-dark);
}
.site-header[data-stuck]{box-shadow:0 16px 32px -26px rgba(0,0,0,.95)}

.scroll-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  pointer-events:none;
}
.scroll-progress__fill{
  display:block;
  width:100%;
  height:100%;
  background:var(--amber);
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform .12s linear;
}

.header-rail{
  background:linear-gradient(90deg,var(--harbor) 0%,var(--ink) 68%);
  border-bottom:1px solid rgba(54,81,107,.55);
}
.header-rail__inner{
  display:flex;
  align-items:center;
  gap:18px;
  height:var(--rail-h);
  overflow:hidden;
}
.header-rail__tag{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin:0;
  flex:none;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.16em;
  color:var(--paper);
}
.header-rail__pulse{
  width:6px;
  height:6px;
  background:var(--celadon);
  box-shadow:0 0 0 3px rgba(127,168,155,.2);
  flex:none;
}
.header-rail__note{
  margin:0;
  flex:1 1 auto;
  min-width:0;
  overflow:hidden;
  white-space:nowrap;
  text-overflow:ellipsis;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.08em;
  color:var(--mist);
}
.header-rail__status{
  margin:0;
  flex:none;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.14em;
  color:var(--amber);
}
.header-rail__status::before{content:"● ";font-size:.6em;vertical-align:.15em}

.header-main{position:relative}
.header-main__inner{
  position:relative;
  display:flex;
  align-items:center;
  gap:clamp(14px,3vw,36px);
  min-height:var(--main-h);
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  flex:none;
  text-decoration:none;
  color:var(--white);
}
.brand__mark{
  display:flex;
  align-items:flex-end;
  gap:3px;
  height:28px;
  padding:4px;
  border:1px solid rgba(224,138,46,.62);
  flex:none;
}
.brand__bar{display:block;width:4px;background:var(--amber)}
.brand__bar:nth-child(1){height:7px}
.brand__bar:nth-child(2){height:13px}
.brand__bar:nth-child(3){height:19px}
.brand__text{display:flex;flex-direction:column;line-height:1.1}
.brand__line{
  font-family:var(--font-head);
  font-weight:800;
  font-size:1.0625rem;
  letter-spacing:.03em;
}
.brand__sub{
  margin-top:5px;
  font-family:var(--font-mono);
  font-size:.5625rem;
  letter-spacing:.2em;
  color:var(--mist);
}
.brand:hover .brand__bar{background:var(--white)}

.primary-nav{flex:1 1 auto;min-width:0}
.primary-nav__list{
  display:flex;
  justify-content:flex-end;
  align-items:center;
  gap:0;
  list-style:none;
}
.primary-nav__item{position:relative}
.primary-nav__link{
  position:relative;
  display:inline-flex;
  align-items:baseline;
  gap:6px;
  padding:11px 12px;
  color:var(--mist);
  font-size:.9375rem;
  font-weight:500;
  text-decoration:none;
  white-space:nowrap;
  transition:color .18s ease;
}
.primary-nav__index{
  font-family:var(--font-mono);
  font-size:.5625rem;
  letter-spacing:.08em;
  color:var(--steel);
  transition:color .18s ease;
}
.primary-nav__link::after{
  content:"";
  position:absolute;
  left:12px;
  right:12px;
  bottom:5px;
  height:2px;
  background:var(--amber);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .2s ease;
}
.primary-nav__link:hover,
.primary-nav__link:focus-visible{color:var(--white)}
.primary-nav__link:hover::after,
.primary-nav__link:focus-visible::after{transform:scaleX(1)}
.primary-nav__link[aria-current="page"]{color:var(--white);font-weight:700}
.primary-nav__link[aria-current="page"]::after{transform:scaleX(1)}
.primary-nav__link[aria-current="page"] .primary-nav__index{color:var(--amber)}
.primary-nav__cta{display:none}

.header-actions{display:flex;align-items:center;gap:10px;flex:none}
.header-actions__cta{flex:none}

.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:10px 12px;
  background:transparent;
  color:var(--paper);
  border:1px solid rgba(169,184,200,.42);
  font-family:var(--font-mono);
  font-size:.625rem;
  letter-spacing:.18em;
  cursor:pointer;
  transition:border-color .18s ease,color .18s ease;
}
.nav-toggle:hover{border-color:var(--amber);color:var(--amber)}
.nav-toggle__box{display:grid;gap:4px;width:18px;flex:none}
.nav-toggle__bar{
  display:block;
  height:2px;
  background:currentColor;
  transition:transform .2s ease,opacity .18s ease;
}
.site-header[data-open] .nav-toggle{border-color:var(--amber);color:var(--amber)}
.site-header[data-open] .nav-toggle__bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bar:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle__bar:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.nav-toggle__label{line-height:1}

/* 5. 页脚 ---------------------------------------------------------------- */
.site-footer{
  position:relative;
  background:var(--ink);
  color:var(--mist);
  font-size:.875rem;
  padding-bottom:clamp(20px,3vw,32px);
}
.footer-rule{
  height:3px;
  background:linear-gradient(90deg,var(--amber) 0 128px,var(--celadon-deep) 128px 208px,var(--steel) 208px 100%);
}
.footer-inner{
  display:grid;
  gap:clamp(28px,4vw,56px);
  padding-block:clamp(34px,5vw,64px) clamp(26px,4vw,44px);
}
.footer-brand__line{
  margin:0 0 10px;
  font-family:var(--font-head);
  font-weight:800;
  font-size:clamp(1.5rem,3vw,2rem);
  letter-spacing:-.01em;
  color:var(--white);
}
.footer-brand__note{
  margin:0 0 16px;
  max-width:24ch;
  font-size:.9375rem;
  line-height:1.7;
  color:var(--mist);
}
.footer-brand__status{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin:0;
  font-family:var(--font-mono);
  font-size:.625rem;
  letter-spacing:.12em;
  color:var(--celadon);
}
.footer-brand__dot{
  width:6px;
  height:6px;
  background:var(--celadon);
  box-shadow:0 0 0 3px rgba(127,168,155,.16);
  flex:none;
}
.footer-grid{
  display:grid;
  gap:clamp(20px,3vw,36px);
  grid-template-columns:1fr;
}
.footer-col__title{
  margin:0 0 12px;
  padding-bottom:10px;
  border-bottom:1px solid rgba(54,81,107,.62);
  font-family:var(--font-mono);
  font-size:.625rem;
  font-weight:500;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--celadon);
}
.footer-col__list{list-style:none;display:grid;gap:1px}
.footer-col__link{
  display:inline-block;
  padding:5px 0;
  color:var(--mist);
  text-decoration:none;
  background-image:linear-gradient(var(--amber),var(--amber));
  background-repeat:no-repeat;
  background-position:0 100%;
  background-size:0 1px;
  transition:color .18s ease,background-size .22s ease;
}
.footer-col__link:hover,
.footer-col__link:focus-visible{color:var(--amber);background-size:100% 1px}
.footer-col__link--mono{font-family:var(--font-mono);font-size:.8125rem;letter-spacing:.02em}
.footer-col--contact .footer-col__list{gap:2px}

.footer-meta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 26px;
  padding-top:18px;
  border-top:1px solid rgba(54,81,107,.62);
  font-family:var(--font-mono);
  font-size:.625rem;
  letter-spacing:.1em;
  color:var(--mist);
}
.footer-legal{margin:0}
.footer-meta__links{display:flex;flex-wrap:wrap;gap:8px 18px;list-style:none}
.footer-meta__links a{
  color:var(--mist);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.footer-meta__links a:hover,
.footer-meta__links a:focus-visible{color:var(--amber);border-bottom-color:var(--amber)}
.footer-copy{margin:0 0 0 auto}

.to-top{
  position:fixed;
  right:clamp(14px,3vw,28px);
  bottom:clamp(14px,3vw,28px);
  z-index:55;
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:11px 15px;
  background:var(--ink);
  color:var(--paper);
  border:1px solid var(--steel);
  font-family:var(--font-mono);
  font-size:.625rem;
  letter-spacing:.14em;
  cursor:pointer;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.to-top:hover{background:var(--amber);color:var(--ink);border-color:var(--amber)}
.to-top[hidden]{display:none}
.to-top__arrow{font-size:.8125rem;line-height:1}

/* 6. 通用组件 ------------------------------------------------------------ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:14px 22px;
  border:1px solid transparent;
  border-radius:0;
  font-family:var(--font-head);
  font-weight:700;
  font-size:.9375rem;
  line-height:1;
  letter-spacing:.02em;
  text-decoration:none;
  cursor:pointer;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.btn--amber{background:var(--amber);color:var(--ink)}
.btn--amber:hover,.btn--amber:focus-visible{background:var(--amber-deep);color:var(--white)}
.btn--ghost{background:transparent;border-color:rgba(169,184,200,.45);color:var(--white)}
.btn--ghost:hover,.btn--ghost:focus-visible{border-color:var(--amber);color:var(--amber)}
.btn--sm{padding:10px 16px;font-size:.8125rem}
.btn--block{display:flex;width:100%}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 9px;
  border:1px solid rgba(54,81,107,.5);
  font-family:var(--font-mono);
  font-size:.625rem;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--celadon-deep);
  background:rgba(127,168,155,.1);
}
.tag--amber{color:var(--amber-deep);border-color:rgba(168,94,24,.5);background:var(--amber-ghost)}
.tag--celadon{color:var(--celadon-deep);border-color:rgba(79,111,102,.5);background:var(--celadon-ghost)}
.tag--rust{color:var(--rust);border-color:rgba(184,74,74,.45);background:rgba(184,74,74,.1)}
.tag--on-dark{color:var(--mist);border-color:rgba(169,184,200,.42);background:rgba(169,184,200,.08)}

.panel{
  position:relative;
  padding:clamp(18px,2.6vw,28px);
  background:var(--white);
  border:1px solid var(--rule);
}
.panel--cut{
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,var(--cut) 100%,0 calc(100% - var(--cut)));
}
.panel--dark{background:var(--harbor);border-color:var(--steel);color:var(--paper)}
.panel--dark h3,.panel--dark h4{color:var(--white)}

.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  background:var(--harbor);
  clip-path:polygon(0 0,calc(100% - 20px) 0,100% 20px,100% 100%,0 100%);
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  box-shadow:inset 0 0 0 1px rgba(169,184,200,.32);
}
.media-frame__img{display:block;width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}
.media-frame--band{aspect-ratio:21/9}
.figure-caption{
  margin:10px 0 0;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.06em;
  color:var(--ink-soft);
}
.surface-dark .figure-caption{color:var(--mist)}

.status-bar{
  display:flex;
  flex-wrap:wrap;
  gap:8px 22px;
  padding:11px 0;
  border-top:1px solid rgba(54,81,107,.5);
  border-bottom:1px solid rgba(54,81,107,.5);
  font-family:var(--font-mono);
  font-size:.625rem;
  letter-spacing:.12em;
  color:var(--mist);
}
.status-bar__item{display:inline-flex;align-items:center;gap:7px}
.status-bar__dot{width:7px;height:7px;background:var(--celadon);flex:none}
.status-bar__dot--amber{background:var(--amber)}
.status-bar__dot--rust{background:var(--rust)}

.breadcrumbs{
  margin:0 0 20px;
  font-family:var(--font-mono);
  font-size:.625rem;
  letter-spacing:.14em;
  color:var(--celadon-deep);
}
.breadcrumbs__list{display:flex;flex-wrap:wrap;gap:4px;list-style:none}
.breadcrumbs__item{display:inline-flex;align-items:center;gap:4px}
.breadcrumbs__item::after{content:"/";color:var(--steel);margin-left:4px}
.breadcrumbs__item:last-child::after{display:none}
.breadcrumbs__link{
  color:inherit;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.breadcrumbs__link:hover,.breadcrumbs__link:focus-visible{color:var(--ink);border-bottom-color:var(--amber)}
.breadcrumbs__item[aria-current="page"]{color:var(--ink)}
.surface-dark .breadcrumbs{color:var(--celadon)}
.surface-dark .breadcrumbs__link:hover,.surface-dark .breadcrumbs__item[aria-current="page"]{color:var(--white)}

.toc{
  position:sticky;
  top:calc(var(--rail-h) + var(--main-h) + 24px);
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.04em;
}
.toc__title{
  margin:0 0 12px;
  font-size:.625rem;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--celadon-deep);
  padding-bottom:8px;
  border-bottom:1px solid var(--rule);
}
.toc__list{list-style:none;display:grid;gap:1px;border-left:1px solid var(--rule)}
.toc__link{
  display:block;
  margin-left:-1px;
  padding:7px 0 7px 14px;
  border-left:2px solid transparent;
  color:var(--celadon-deep);
  text-decoration:none;
  transition:color .18s ease,border-color .18s ease;
}
.toc__link:hover,.toc__link:focus-visible{color:var(--ink);border-left-color:var(--steel)}
.toc__link[aria-current="true"]{color:var(--ink);font-weight:700;border-left-color:var(--amber)}

.disclosure{
  padding:0 18px;
  background:var(--white);
  border:1px solid var(--rule);
}
.disclosure + .disclosure{margin-top:10px}
.disclosure__summary{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding:15px 0;
  cursor:pointer;
  list-style:none;
  font-family:var(--font-head);
  font-weight:700;
  font-size:1rem;
  color:var(--ink);
}
.disclosure__summary::-webkit-details-marker{display:none}
.disclosure__summary::after{
  content:"+";
  font-family:var(--font-mono);
  font-size:1.125rem;
  line-height:1;
  color:var(--amber-deep);
  flex:none;
  transition:color .18s ease;
}
.disclosure[open] .disclosure__summary::after{content:"–";color:var(--amber)}
.disclosure[open] .disclosure__summary{border-bottom:1px solid var(--rule)}
.disclosure__body{padding:16px 0 18px;font-size:.9375rem;line-height:1.75;color:var(--ink-soft)}
.disclosure__body > *:first-child{margin-top:0}

.compare{display:grid;gap:16px}
.compare__bar{display:flex;flex-wrap:wrap;gap:8px}
.compare__btn{
  padding:9px 15px;
  background:transparent;
  border:1px solid rgba(54,81,107,.5);
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.12em;
  color:var(--celadon-deep);
  cursor:pointer;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.compare__btn:hover{border-color:var(--amber);color:var(--amber-deep)}
.compare__btn[aria-pressed="true"]{background:var(--amber);border-color:var(--amber);color:var(--ink);font-weight:700}
.compare__panel[hidden]{display:none}

/* 7. 响应式与无障碍 ------------------------------------------------------ */
@media (min-width:560px){
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (min-width:900px){
  .footer-inner{grid-template-columns:minmax(210px,.85fr) minmax(0,2fr)}
  .footer-grid{grid-template-columns:1fr 1fr 1.3fr}
}
@media (max-width:1080px){
  :root{--main-h:64px}
  .header-main__inner{gap:12px}
  .primary-nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    z-index:5;
    display:block;
    max-height:calc(100vh - var(--rail-h) - var(--main-h) - 8px);
    overflow-y:auto;
    padding:10px var(--gutter) 22px;
    background:linear-gradient(180deg,var(--harbor) 0%,var(--ink) 100%);
    border-top:1px solid rgba(224,138,46,.55);
    border-bottom:1px solid var(--steel);
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .2s ease,transform .2s ease,visibility .2s ease;
    box-shadow:0 24px 40px -30px rgba(0,0,0,.95);
  }
  .site-header[data-open] .primary-nav{opacity:1;visibility:visible;transform:none}
  .primary-nav__list{flex-direction:column;align-items:stretch;gap:0;justify-content:flex-start}
  .primary-nav__item{border-bottom:1px solid rgba(54,81,107,.45)}
  .primary-nav__item:last-child{border-bottom:0}
  .primary-nav__link{display:flex;width:100%;align-items:center;gap:14px;padding:15px 2px;font-size:1rem;color:var(--paper)}
  .primary-nav__link::after{display:none}
  .primary-nav__index{font-size:.625rem;color:var(--celadon)}
  .primary-nav__link[aria-current="page"]{
    color:var(--amber);
    box-shadow:inset 3px 0 0 var(--amber);
    padding-left:14px;
  }
  .primary-nav__link[aria-current="page"] .primary-nav__index{color:var(--amber)}
  .primary-nav__cta{display:inline-flex;margin-top:16px}
  .nav-toggle{display:inline-flex}
  .header-actions__cta{display:none}
}
@media (max-width:900px){
  .header-rail__note{display:none}
  .header-rail__status{margin-left:auto}
}
@media (max-width:640px){
  :root{--rail-h:30px;--main-h:60px}
  .brand__sub{display:none}
  .brand__line{font-size:1rem}
  .footer-legal,.footer-copy{width:100%}
  .footer-copy{margin:0}
  .footer-meta{gap:8px 18px}
  .prose{font-size:.9688rem}
  .to-top{padding:9px 12px}
  .nav-toggle__label{display:none}
}
@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;
  }
}
@media print{
  .site-header,.site-footer,.to-top,.skip-link,.scroll-progress{display:none !important}
  body{background:#fff;color:#000}
  .panel,.disclosure{border-color:#999}
  a[href]::after{content:" (" attr(href) ")";font-size:.75em;color:#555}
}