/* ============================================================
   9397 威利斯 · 共享站点样式  /assets/site.css
   档案室视觉：墨蓝纸底 + 铜金装订线 + 米白纸面
   ============================================================ */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --ink:#0E1B2C;
  --ink-2:#17293D;
  --steel:#2C4257;
  --copper:#C08A2E;
  --copper-light:#E3B763;
  --signal:#F0712B;
  --signal-ink:#12181F;

  --paper:#F4F1EA;
  --paper-2:#E2DCCF;
  --cool:#8A98A3;
  --stone:#5C6670;
  --moss:#3F5B4A;
  --clay:#A65A3E;

  --on-dark:#F4F1EA;
  --on-dark-dim:#AEBDC7;
  --on-light:#14212F;

  --font-sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;

  --fs-hero:clamp(2.75rem,6.4vw,4.75rem);
  --fs-h2:clamp(2rem,4.2vw,3.25rem);
  --fs-h3:clamp(1.5rem,2.4vw,2.125rem);
  --fs-h4:1.5rem;
  --fs-body:1.0625rem;
  --fs-sm:.875rem;
  --fs-xs:.75rem;
  --fs-mono:.6875rem;

  --gutter:clamp(1.25rem,4.5vw,4rem);
  --page-max:1240px;
  --dock-h:56px;

  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:.42s;
}

/* ---------- 2. 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  padding-bottom:var(--dock-h);
  background:var(--paper);
  color:var(--on-light);
  font-family:var(--font-sans);
  font-size:var(--fs-body);
  font-weight:400;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5,h6{margin:0;font-weight:900;letter-spacing:-.02em;line-height:1.15}
h1{font-size:var(--fs-h2)}
h2{font-size:var(--fs-h3)}
h3{font-size:var(--fs-h4)}
h4{font-size:1.125rem;font-weight:700;letter-spacing:0}
p{margin:0}
p+p{margin-top:.9em}
ul,ol{margin:0;padding:0;list-style:none}
figure,blockquote,dl,dd{margin:0}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
strong,b{font-weight:700}
em{font-style:normal;color:var(--copper)}
code,kbd,samp{font-family:var(--font-mono);font-size:.9em}
main{display:block}
::selection{background:var(--copper);color:var(--ink)}
[id]{scroll-margin-top:96px}

/* ---------- 3. 焦点与可访问性 ---------- */
:focus-visible{
  outline:2px solid var(--copper-light);
  outline-offset:3px;
  border-radius:2px;
}
.skip-link{
  position:fixed;
  top:12px;left:12px;z-index:200;
  transform:translateY(-220%);
  padding:.65rem 1.15rem;
  background:var(--signal);
  color:var(--signal-ink);
  font-size:var(--fs-sm);
  font-weight:700;
  border-radius:2px;
  transition:transform .16s var(--ease);
}
.skip-link:focus{transform:translateY(0)}
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

/* ---------- 4. 容器与排版工具 ---------- */
.wrap{width:100%;max-width:var(--page-max);margin-inline:auto;padding-inline:var(--gutter)}
.wrap--narrow{max-width:820px}
.rule{height:1px;border:0;margin:0;background:var(--steel)}
.mono-label{
  font-family:var(--font-mono);
  font-size:var(--fs-mono);
  font-weight:500;
  letter-spacing:.14em;
  text-transform:uppercase;
  line-height:1.6;
  color:var(--copper);
  margin:0;
}
.mono-label--light{color:var(--copper-light)}
.mono-label--muted{color:var(--cool)}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  padding:.62rem 1.15rem;
  border:1px solid transparent;
  border-radius:2px;
  font-size:var(--fs-sm);
  font-weight:700;
  line-height:1.3;
  letter-spacing:.01em;
  white-space:nowrap;
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.btn--signal{background:var(--signal);color:var(--signal-ink)}
.btn--signal:hover,.btn--signal:focus-visible{background:#FF8B4D;color:var(--signal-ink)}
.btn--copper{background:var(--copper);color:var(--ink)}
.btn--copper:hover,.btn--copper:focus-visible{background:var(--copper-light)}
.btn--ghost{border-color:var(--steel);color:var(--on-dark)}
.btn--ghost:hover,.btn--ghost:focus-visible{border-color:var(--copper-light);color:var(--copper-light)}

/* ---------- 6. 页头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:var(--ink);
  color:var(--on-dark);
  border-bottom:1px solid var(--steel);
  transition:background .24s var(--ease),border-color .24s var(--ease);
}
.site-header[data-scrolled="true"]{
  background:rgba(14,27,44,.96);
  border-bottom-color:var(--copper);
}
.site-header__progress{
  position:absolute;
  left:0;bottom:-1px;
  display:block;
  width:100%;
  height:2px;
  background:var(--copper-light);
  transform:scaleX(0);
  transform-origin:left center;
  z-index:2;
  pointer-events:none;
}
.header__inner{
  width:100%;
  max-width:var(--page-max);
  margin-inline:auto;
  padding:.9rem var(--gutter);
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;
  gap:clamp(1rem,3vw,2.5rem);
  transition:padding .22s var(--ease);
}
.site-header[data-scrolled="true"] .header__inner{padding-block:.45rem}

.header__brand{
  display:flex;
  align-items:center;
  gap:clamp(.7rem,1.4vw,1.15rem);
  min-width:0;
}
.brand{display:inline-flex;align-items:center;gap:.75rem;min-width:0}
.brand__mark{
  flex:none;
  display:grid;
  place-items:center;
  width:44px;height:44px;
  background:var(--copper);
  color:var(--ink);
  font-family:var(--font-mono);
  font-size:.8125rem;
  font-weight:700;
  letter-spacing:.04em;
  border-radius:2px;
  transition:background .18s var(--ease);
}
.brand:hover .brand__mark,.brand:focus-visible .brand__mark{background:var(--copper-light)}
.brand__text{display:flex;flex-direction:column;gap:1px;line-height:1.25;min-width:0}
.brand__name{
  font-size:.9375rem;
  font-weight:700;
  letter-spacing:.02em;
  color:var(--on-dark);
  white-space:nowrap;
}
.brand__line{
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.08em;
  color:var(--cool);
  white-space:nowrap;
}
.index-toggle{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  padding:.34rem .6rem;
  border:1px solid var(--steel);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.08em;
  color:var(--cool);
  white-space:nowrap;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.index-toggle:hover,.index-toggle[aria-expanded="true"]{
  color:var(--copper-light);
  border-color:var(--copper);
}
.index-toggle__dot{
  width:6px;height:6px;border-radius:50%;
  background:var(--signal);
  flex:none;
}
.index-toggle__label{line-height:1}

/* ---------- 7. 导航 ---------- */
.header__nav{
  display:flex;
  align-items:center;
  justify-content:flex-end;
  gap:clamp(1rem,2vw,1.75rem);
  min-width:0;
}
.nav__list{
  display:flex;
  align-items:center;
  gap:clamp(.7rem,1.6vw,1.5rem);
  flex-wrap:nowrap;
}
.nav__item{display:block}
.nav__link{
  position:relative;
  display:inline-block;
  padding:.3rem 0;
  font-size:var(--fs-sm);
  font-weight:500;
  color:var(--on-dark);
  white-space:nowrap;
  transition:color .18s var(--ease);
}
.nav__link::after{
  content:"";
  position:absolute;
  left:0;bottom:0;
  width:100%;height:1px;
  background:var(--copper-light);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .2s var(--ease);
}
.nav__link:hover,.nav__link:focus-visible{color:var(--copper-light)}
.nav__link:hover::after,.nav__link:focus-visible::after{transform:scaleX(1)}
.nav__link[aria-current="page"]{color:var(--copper-light)}
.nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--copper)}

.header__actions{display:flex;align-items:center;gap:.6rem}
.header__cta--mobile{display:none}

.nav-toggle{
  display:none;
  width:44px;height:44px;
  place-items:center;
  border:1px solid var(--steel);
  border-radius:2px;
  color:var(--on-dark);
  transition:border-color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--copper)}
.nav-toggle__bars{
  position:relative;
  display:block;
  width:18px;height:2px;
  background:currentColor;
  transition:background .18s var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;left:0;
  width:18px;height:2px;
  background:currentColor;
  transition:transform .2s var(--ease),top .2s var(--ease);
}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.site-header[data-open="true"] .nav-toggle__bars,
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.site-header[data-open="true"] .nav-toggle__bars::before,
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:0;transform:rotate(45deg)}
.site-header[data-open="true"] .nav-toggle__bars::after,
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{top:0;transform:rotate(-45deg)}

/* ---------- 8. 站点索引抽屉 ---------- */
.site-index{
  position:absolute;
  left:0;right:0;top:100%;
  z-index:70;
  background:var(--ink-2);
  border-bottom:1px solid var(--copper);
  box-shadow:0 28px 52px -18px rgba(0,0,0,.6);
}
.site-index[hidden]{display:none}
.site-index__inner{
  width:100%;
  max-width:var(--page-max);
  margin-inline:auto;
  padding:1.75rem var(--gutter) 2rem;
}
.site-index__eyebrow{margin-bottom:1.1rem;color:var(--copper-light)}
.site-index__list{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:1px;
  background:var(--steel);
  border:1px solid var(--steel);
}
.site-index__link{
  display:flex;
  align-items:center;
  gap:.7rem;
  padding:.85rem 1rem;
  background:var(--ink-2);
  color:var(--on-dark);
  font-size:.9375rem;
  transition:background .18s var(--ease),color .18s var(--ease);
}
.site-index__link:hover,.site-index__link:focus-visible{
  background:var(--ink);
  color:var(--copper-light);
}
.site-index__no{
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.08em;
  color:var(--copper);
}
.site-index__name{flex:1 1 auto;min-width:0}
.site-index__arrow{
  font-family:var(--font-mono);
  font-size:.75rem;
  color:var(--steel);
  transition:color .18s var(--ease);
}
.site-index__link:hover .site-index__arrow{color:var(--copper-light)}

/* ---------- 9. 页脚 ---------- */
.site-footer{
  background:var(--ink);
  color:var(--on-dark);
  border-top:1px solid var(--steel);
}
.footer__grid{
  width:100%;
  max-width:var(--page-max);
  margin-inline:auto;
  padding:clamp(2.5rem,5vw,4.25rem) var(--gutter) clamp(1.5rem,3vw,2.5rem);
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(1.5rem,3.5vw,3rem);
}
.footer__col{min-width:0}
.footer__title{
  margin:0 0 1rem;
  padding-bottom:.7rem;
  border-bottom:1px solid var(--steel);
  font-family:var(--font-mono);
  font-size:.6875rem;
  font-weight:500;
  letter-spacing:.14em;
  color:var(--copper-light);
  line-height:1.5;
}
.footer__list{display:grid;gap:.5rem}
.footer__link{
  position:relative;
  display:inline-block;
  font-size:var(--fs-sm);
  color:var(--on-dark-dim);
  transition:color .18s var(--ease),padding-left .18s var(--ease);
}
.footer__link::before{
  content:"";
  position:absolute;
  left:0;top:50%;
  width:0;height:1px;
  background:var(--copper);
  transform:translateY(-50%);
  transition:width .18s var(--ease);
}
.footer__link:hover,.footer__link:focus-visible{color:var(--copper-light);padding-left:.7rem}
.footer__link:hover::before,.footer__link:focus-visible::before{width:.45rem}
.footer__address{
  font-style:normal;
  margin-top:1rem;
  font-size:.8125rem;
  line-height:1.7;
  color:var(--cool);
}
.footer__contact{
  display:flex;
  align-items:baseline;
  gap:.55rem;
  margin-top:.45rem;
  font-size:.8125rem;
}
.footer__contact+.footer__contact{margin-top:.4rem}
.footer__contact-key{
  flex:none;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.08em;
  color:var(--stone);
}
.footer__contact-val{
  font-family:var(--font-mono);
  font-size:.8125rem;
  letter-spacing:.02em;
  color:var(--on-dark);
  word-break:break-all;
}
.footer__note{
  margin-top:1rem;
  font-size:var(--fs-xs);
  line-height:1.75;
  color:var(--cool);
}
.footer__bottom{
  width:100%;
  max-width:var(--page-max);
  margin-inline:auto;
  padding:.95rem var(--gutter) 1.35rem;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.5rem 1.5rem;
  border-top:1px solid var(--steel);
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.06em;
  color:var(--cool);
}
.footer__copy,.footer__icp{margin:0;line-height:1.7}

/* ---------- 10. 底部固定窄条 ---------- */
.dock{
  position:fixed;
  left:0;right:0;bottom:0;
  z-index:80;
  background:rgba(14,27,44,.97);
  border-top:1px solid var(--copper);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
}
.dock__inner{
  width:100%;
  max-width:var(--page-max);
  margin-inline:auto;
  padding-inline:var(--gutter);
  height:var(--dock-h);
  display:flex;
  align-items:center;
  gap:1rem;
}
.dock__item{
  display:inline-flex;
  align-items:baseline;
  gap:.55rem;
  min-width:0;
  color:var(--on-dark);
  transition:color .18s var(--ease);
}
.dock__item:hover,.dock__item:focus-visible{color:var(--copper-light)}
.dock__key{
  font-size:.8125rem;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}
.dock__val{
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.06em;
  color:var(--copper-light);
  white-space:nowrap;
}
.dock__sep{
  flex:1 1 auto;
  height:1px;
  min-width:1.5rem;
  background:linear-gradient(90deg,transparent,var(--copper),transparent);
}

/* ---------- 11. 标签 / 图片容器 / 面包屑 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  padding:.18rem .55rem;
  border:1px solid var(--steel);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:.6875rem;
  line-height:1.6;
  letter-spacing:.08em;
  color:var(--cool);
  white-space:nowrap;
}
.tag--copper{border-color:var(--copper);color:var(--copper-light)}
.tag--moss{border-color:var(--moss);color:#96B7A2;background:rgba(63,91,74,.24)}
.tag--clay{border-color:var(--clay);color:#D79479;background:rgba(166,90,62,.2)}
.tag--signal{border-color:var(--signal);color:var(--signal)}

.media{
  position:relative;
  display:block;
  overflow:hidden;
  background:var(--ink-2);
  border:1px solid var(--paper-2);
  aspect-ratio:4 / 3;
  box-shadow:8px 8px 0 0 rgba(192,138,46,.32);
}
.media img{
  width:100%;height:100%;
  object-fit:cover;
  transition:transform .32s var(--ease);
}
@media (hover:hover){
  .media:hover img{transform:scale(1.03)}
}
.media--paper{
  background:var(--paper-2);
  border-color:var(--paper-2);
  box-shadow:8px 8px 0 0 var(--paper-2);
}
.media--wide{aspect-ratio:16 / 9}
.media--square{aspect-ratio:1 / 1}
.media--tall{aspect-ratio:3 / 4}
.media__tag{
  position:absolute;
  left:0;top:0;
  padding:.3rem .65rem;
  background:var(--copper);
  color:var(--ink);
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.08em;
  line-height:1.6;
}

.crumb{padding-block:1rem}
.crumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5rem;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.08em;
}
.crumb__link{color:var(--stone);transition:color .18s var(--ease)}
.crumb__link:hover,.crumb__link:focus-visible{color:var(--copper)}
.crumb__sep{color:var(--paper-2)}
.crumb__current{color:var(--ink)}
.crumb--dark .crumb__link{color:var(--cool)}
.crumb--dark .crumb__link:hover{color:var(--copper-light)}
.crumb--dark .crumb__sep{color:var(--steel)}
.crumb--dark .crumb__current{color:var(--on-dark)}

/* ---------- 12. 分段标签页协议 ---------- */
[data-tabs] [role="tablist"]{
  display:flex;
  flex-wrap:wrap;
  gap:.4rem;
  border-bottom:1px solid var(--paper-2);
  padding-bottom:.75rem;
}
[data-tabs] [role="tab"]{
  padding:.42rem .85rem;
  border:1px solid var(--paper-2);
  border-radius:2px;
  font-size:var(--fs-sm);
  font-weight:500;
  color:var(--stone);
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
[data-tabs] [role="tab"]:hover{border-color:var(--copper);color:var(--ink)}
[data-tabs] [role="tab"][aria-selected="true"]{
  background:var(--ink);
  border-color:var(--ink);
  color:var(--copper-light);
}
[data-tabs] [role="tabpanel"]{padding-top:1.5rem}
[data-tabs] [role="tabpanel"][hidden]{display:none}
[data-tabs][data-tone="dark"] [role="tablist"]{border-bottom-color:var(--steel)}
[data-tabs][data-tone="dark"] [role="tab"]{
  border-color:var(--steel);
  color:var(--cool);
}
[data-tabs][data-tone="dark"] [role="tab"]:hover{border-color:var(--copper);color:var(--on-dark)}
[data-tabs][data-tone="dark"] [role="tab"][aria-selected="true"]{
  background:var(--copper);
  border-color:var(--copper);
  color:var(--ink);
}

/* ---------- 13. 进场与返回顶部 ---------- */
html.js [data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease);
}
html.js [data-reveal][data-revealed="true"]{
  opacity:1;
  transform:none;
}
.to-top{
  position:fixed;
  right:var(--gutter);
  bottom:calc(var(--dock-h) + 16px);
  z-index:75;
  display:grid;
  place-items:center;
  width:42px;height:42px;
  background:var(--ink-2);
  border:1px solid var(--steel);
  border-radius:2px;
  color:var(--copper-light);
  font-family:var(--font-mono);
  font-size:.8125rem;
  opacity:0;
  visibility:hidden;
  transform:translateY(8px);
  transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s var(--ease);
}
.to-top[data-visible="true"]{opacity:1;visibility:visible;transform:none}
.to-top:hover{border-color:var(--copper);color:var(--on-dark)}

/* ---------- 14. 响应式 ---------- */
@media (max-width:1100px){
  .brand__line{display:none}
  .nav__list{gap:.55rem}
  .nav__link{font-size:.8125rem}
}
@media (max-width:960px){
  .header__inner{grid-template-columns:minmax(0,1fr) auto;row-gap:0}
  .header__nav{
    display:none;
    grid-column:1 / -1;
    grid-row:2;
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    gap:0;
    margin-top:.85rem;
    padding-top:.5rem;
    border-top:1px solid var(--steel);
  }
  .header__nav[data-open="true"]{display:flex}
  .nav__list{flex-direction:column;align-items:stretch;gap:0}
  .nav__item{border-bottom:1px solid var(--steel)}
  .nav__item:last-child{border-bottom:0}
  .nav__link{display:block;padding:.75rem .25rem;font-size:1rem}
  .nav__link::after{display:none}
  .nav__link[aria-current="page"]{
    padding-left:.85rem;
    box-shadow:inset 4px 0 0 var(--copper);
  }
  .header__cta--mobile{display:inline-flex;margin-top:.9rem;justify-content:center}
  .header__cta{display:none}
  .nav-toggle{display:inline-grid}
  .index-toggle__label{display:none}
  .index-toggle{padding:.45rem .5rem}
  .site-index__list{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:640px){
  .brand__mark{width:36px;height:36px;font-size:.6875rem}
  .brand__name{font-size:.875rem}
  .site-index__inner{padding-block:1.35rem 1.6rem}
  .site-index__list{grid-template-columns:1fr}
  .site-index__link{padding:.7rem .85rem;font-size:.875rem}
  .footer__grid{grid-template-columns:1fr}
  .footer__bottom{flex-direction:column;align-items:flex-start}
  .dock__key{font-size:.75rem}
  .dock__val{font-size:.6875rem}
  .dock__inner{gap:.6rem}
  .media{box-shadow:6px 6px 0 0 rgba(192,138,46,.32)}
  .media--paper{box-shadow:6px 6px 0 0 var(--paper-2)}
}

/* ---------- 15. 动效降级 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
  html.js [data-reveal]{opacity:1;transform:none}
}