/* ============================================================
   9397威利斯 · 官方CN  |  /assets/site.css
   共享外壳：reset / tokens / 中文排版 / 头部 / 页脚 / 基础组件
   ============================================================ */

/* ---------- 1. tokens ---------- */
:root{
  --ink-900:#0B1B2B;
  --ink-800:#122A42;
  --ink-700:#1D3A57;
  --paper-100:#F2E8D5;
  --paper-200:#E5D7BC;
  --orange:#F26B21;
  --celadon:#3E8E7E;
  --amber:#D9A441;
  --slate:#6B7C93;
  --alert:#C4453C;

  --line:rgba(242,232,213,.18);
  --line-strong:rgba(242,232,213,.36);
  --line-ink:rgba(11,27,43,.20);

  --font-body:system-ui,-apple-system,"Noto Sans SC","Source Han Sans SC","PingFang SC",sans-serif;
  --font-mono:"SFMono-Regular",Consolas,"Roboto Mono",monospace;

  --shell:1320px;
  --gutter:clamp(1rem,4vw,2.5rem);
  --gap:clamp(.9rem,2.2vw,1.5rem);
  --radius:3px;
  --shadow-paper:0 20px 44px -28px rgba(0,0,0,.8);
  --speed:.18s;
}

/* ---------- 2. reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{margin:0;padding:0;-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{margin:0;}
h1,h2,h3,h4,h5,h6,p,figure,blockquote{margin:0;}
ul,ol{margin:0;padding:0;}
img,svg{display:block;max-width:100%;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
a{color:inherit;}
main{display:block;}
#main-content{scroll-margin-top:6rem;}
#main-content:focus{outline:none;}

/* ---------- 3. base ---------- */
body{
  min-height:100vh;
  background-color:var(--ink-900);
  background-image:
    radial-gradient(1100px 520px at 8% -12%, rgba(62,142,126,.16), transparent 62%),
    radial-gradient(920px 470px at 92% -6%, rgba(242,107,33,.12), transparent 68%),
    repeating-linear-gradient(0deg, rgba(242,232,213,.028) 0 1px, transparent 1px 5px);
  color:var(--paper-100);
  font-family:var(--font-body);
  font-size:1rem;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4{font-weight:800;line-height:1.18;letter-spacing:.06em;}
h1{font-size:clamp(1.9rem,4.6vw,3.2rem);letter-spacing:.08em;}
h2{font-size:clamp(1.4rem,3vw,2.05rem);}
h3{font-size:clamp(1.05rem,2vw,1.35rem);letter-spacing:.05em;}
h4{font-size:1rem;letter-spacing:.05em;}
p{max-width:74ch;}

::selection{background:var(--orange);color:#0B1B2B;}

:focus-visible{outline:2px solid var(--orange);outline-offset:3px;border-radius:2px;}

.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.04em;}

.visually-hidden{
  position:absolute!important;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;
}

/* ---------- 4. 布局骨架 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.section{padding-block:clamp(2.6rem,6vw,5rem);}

.section-head{
  display:grid;
  gap:.55rem;
  margin-bottom:clamp(1.4rem,3vw,2.2rem);
  border-left:3px solid var(--orange);
  padding-left:clamp(.8rem,2vw,1.2rem);
}

.eyebrow{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--amber);
}

.section-title{color:var(--paper-100);}

.lede{font-size:1.05rem;color:var(--paper-200);}

.stack{display:grid;gap:var(--gap);}

.rule{border:0;border-top:1px dashed var(--line);margin-block:clamp(1.4rem,3vw,2.4rem);}

.grid{display:grid;gap:var(--gap);}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));}
.grid--4{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  padding:.62rem 1.05rem;
  border:1px solid transparent;
  border-radius:var(--radius);
  font-size:.9rem;
  font-weight:800;
  letter-spacing:.1em;
  text-decoration:none;
  white-space:nowrap;
  transition:background-color var(--speed) ease,color var(--speed) ease,border-color var(--speed) ease,transform var(--speed) ease;
}
.btn--primary{background:var(--orange);border-color:var(--orange);color:#0B1B2B;}
.btn--primary:hover{background:#FF8340;border-color:#FF8340;}
.btn--ghost{background:rgba(11,27,43,.5);border-color:var(--line-strong);color:var(--paper-100);}
.btn--ghost:hover{background:var(--ink-700);border-color:var(--paper-200);}
.btn--quiet{
  padding:.35rem .2rem;
  color:var(--orange);
  border-color:transparent;
  border-bottom:1px solid rgba(242,107,33,.5);
  border-radius:0;
  background:none;
}
.btn--quiet:hover{color:#FF8340;border-bottom-color:#FF8340;}

/* ---------- 6. 通用组件 ---------- */
.card{
  position:relative;
  background:var(--ink-800);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:clamp(1rem,2.4vw,1.6rem);
  box-shadow:var(--shadow-paper);
}
.card--paper{
  background:var(--paper-100);
  border-color:var(--paper-200);
  color:var(--ink-900);
}
.card--paper .card-title,.card--paper .card-body{color:var(--ink-900);}
.card--signal{border-left:3px solid var(--orange);}
.card-head{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:1rem;
  flex-wrap:wrap;
  padding-bottom:.7rem;
  margin-bottom:.9rem;
  border-bottom:1px dashed var(--line);
}
.card--paper .card-head{border-bottom-color:var(--line-ink);}
.card-title{font-size:1.02rem;}
.card-body{font-size:.95rem;color:var(--paper-200);}

.tag{
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  padding:.22rem .5rem;
  border:1px solid var(--line-strong);
  border-radius:2px;
  background:rgba(29,58,87,.6);
  color:var(--paper-200);
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.1em;
  text-transform:uppercase;
  white-space:nowrap;
}
.tag--orange{color:#FFD6BE;border-color:rgba(242,107,33,.6);background:rgba(242,107,33,.16);}
.tag--celadon{color:#C3E7DE;border-color:rgba(62,142,126,.7);background:rgba(62,142,126,.18);}
.tag--amber{color:#F0D9A8;border-color:rgba(217,164,65,.7);background:rgba(217,164,65,.16);}
.tag--alert{color:#F6C9C5;border-color:rgba(196,69,60,.75);background:rgba(196,69,60,.2);}

.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5rem;
  list-style:none;
  margin:0 0 1rem;
  font-family:var(--font-mono);
  font-size:.74rem;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--slate);
}
.crumb{display:inline-flex;align-items:center;}
.crumb a{color:var(--paper-200);text-decoration:none;}
.crumb a:hover{color:var(--orange);}
.crumb-sep{color:var(--orange);}

/* 图片容器（页面阶段放入 <img>） */
.media-frame{
  position:relative;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background-color:var(--ink-800);
  background-image:
    repeating-linear-gradient(135deg, rgba(242,232,213,.05) 0 8px, transparent 8px 16px),
    linear-gradient(160deg, var(--ink-700), var(--ink-800));
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  box-shadow:inset 0 0 0 1px rgba(11,27,43,.55);
  pointer-events:none;
}
.media-frame img{width:100%;height:100%;object-fit:cover;}
.media-frame--wide{aspect-ratio:16/9;}
.media-frame--tall{aspect-ratio:3/4;}
.media-frame--square{aspect-ratio:1/1;}
.media-frame--band{aspect-ratio:21/9;}
.media-caption{
  margin-top:.6rem;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.1em;
  color:var(--slate);
}

/* 编号索引 */
.index-list{list-style:none;display:grid;gap:.5rem;}
.index-item{
  display:flex;
  align-items:flex-start;
  gap:.9rem;
  padding:.7rem .9rem;
  border:1px solid var(--line);
  border-left:3px solid var(--orange);
  border-radius:2px;
  background:rgba(18,42,66,.72);
}
.index-num{
  flex:0 0 auto;
  min-width:2.4em;
  font-family:var(--font-mono);
  font-size:.8rem;
  letter-spacing:.08em;
  color:var(--amber);
}
.index-text{font-size:.95rem;color:var(--paper-200);}

/* 键值对照 */
.kv-list{list-style:none;display:grid;gap:.55rem;}
.kv-list li{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:.6rem;
  padding-bottom:.5rem;
  border-bottom:1px dashed var(--line);
}
.kv-key{
  font-family:var(--font-mono);
  font-size:.76rem;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--slate);
}
.kv-value{color:var(--paper-100);font-weight:600;}

/* 可展开组 */
.accordion{display:grid;gap:.6rem;}
.accordion-item{
  background:var(--ink-800);
  border:1px solid var(--line);
  border-radius:var(--radius);
  overflow:hidden;
}
.accordion-trigger{
  display:flex;
  width:100%;
  align-items:center;
  gap:.8rem;
  padding:.9rem 1rem;
  text-align:left;
  font-weight:800;
  letter-spacing:.05em;
  color:var(--paper-100);
  transition:background-color var(--speed) ease;
}
.accordion-trigger:hover{background:var(--ink-700);}
.accordion-mark{
  margin-left:auto;
  font-family:var(--font-mono);
  font-size:1rem;
  color:var(--orange);
  transition:transform var(--speed) ease;
}
.accordion-trigger[aria-expanded="true"] .accordion-mark{transform:rotate(45deg);}
.accordion-panel{padding:0 1rem 1rem;}
.accordion-panel[hidden]{display:none;}
.accordion-panel-inner{
  padding-top:.85rem;
  border-top:1px dashed var(--line);
  font-size:.95rem;
  color:var(--paper-200);
}

/* ---------- 7. 头部命令栏 ---------- */
.skip-link{
  position:absolute;
  left:1rem;
  top:-4rem;
  z-index:120;
  padding:.6rem 1rem;
  background:var(--orange);
  color:#0B1B2B;
  font-weight:800;
  letter-spacing:.08em;
  text-decoration:none;
  border-radius:2px;
  transition:top var(--speed) ease;
}
.skip-link:focus{top:.6rem;}

.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:linear-gradient(180deg, rgba(11,27,43,.98), rgba(11,27,43,.93));
  border-bottom:1px solid var(--line);
  color:var(--paper-100);
  box-shadow:0 14px 28px -26px rgba(0,0,0,.95);
}
.header-scanline{
  height:3px;
  background-image:repeating-linear-gradient(90deg,
    var(--orange) 0 22px,
    transparent 22px 30px,
    var(--amber) 30px 44px,
    transparent 44px 52px,
    var(--celadon) 52px 62px,
    transparent 62px 74px);
  opacity:.85;
}
.scroll-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  background:var(--orange);
  transform:scaleX(0);
  transform-origin:0 50%;
  pointer-events:none;
}

.header-shell{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.6rem 1.1rem;
  padding-block:.6rem;
}

.header-ident{display:flex;align-items:center;gap:.85rem;min-width:0;}

.brand{
  display:inline-flex;
  align-items:center;
  gap:.7rem;
  text-decoration:none;
  color:var(--paper-100);
}
.brand-plate{
  display:grid;
  place-items:center;
  min-width:58px;
  padding:.34rem .45rem;
  background:var(--paper-100);
  color:var(--ink-900);
  border:1px solid var(--paper-200);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:.92rem;
  font-weight:700;
  letter-spacing:.04em;
  box-shadow:3px 3px 0 rgba(242,107,33,.9);
}
.brand-text{display:flex;flex-direction:column;line-height:1.15;}
.brand-name{font-size:1rem;font-weight:800;letter-spacing:.1em;}
.brand-sub{
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.12em;
  color:var(--paper-200);
  opacity:.7;
}

.status-chip{
  display:inline-flex;
  align-items:center;
  gap:.45rem;
  padding:.24rem .6rem;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(62,142,126,.14);
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.14em;
  color:var(--paper-200);
  max-width:none;
  white-space:nowrap;
}
.status-dot{
  width:7px;
  height:7px;
  border-radius:50%;
  background:var(--celadon);
  box-shadow:0 0 0 3px rgba(62,142,126,.22);
  animation:pulse 2.4s ease-in-out infinite;
}
@keyframes pulse{
  0%,100%{opacity:1;}
  50%{opacity:.45;}
}

.site-nav{flex:1 1 auto;min-width:0;display:flex;justify-content:center;}
.nav-list{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:2px;
  list-style:none;
}
.nav-item{flex:0 0 auto;}
.nav-link{
  display:inline-flex;
  align-items:center;
  gap:.45rem;
  padding:.46rem .72rem;
  border:1px solid transparent;
  border-radius:var(--radius);
  color:var(--paper-200);
  font-size:.85rem;
  font-weight:800;
  letter-spacing:.08em;
  text-decoration:none;
  transition:background-color var(--speed) ease,color var(--speed) ease,border-color var(--speed) ease;
}
.nav-link:hover{background:var(--ink-700);border-color:var(--line);color:var(--paper-100);}
.nav-link[aria-current="page"]{background:var(--orange);border-color:var(--orange);color:#0B1B2B;}
.nav-index{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.04em;color:var(--amber);}
.nav-link[aria-current="page"] .nav-index{color:rgba(11,27,43,.62);}

.header-meta{display:flex;align-items:center;gap:.55rem;margin-left:auto;}
.version-stack{display:flex;align-items:center;gap:.4rem;}
.version-pill{
  display:inline-flex;
  align-items:center;
  gap:.3rem;
  padding:.26rem .5rem;
  border:1px solid var(--line-strong);
  border-radius:2px;
  background:rgba(11,27,43,.6);
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.06em;
  color:var(--paper-200);
  white-space:nowrap;
}
.version-pill b{font-weight:700;color:var(--paper-100);}
.version-pill--new{border-color:rgba(62,142,126,.7);}
.version-pill--new b{color:#C3E7DE;}
.version-pill--old{border-color:rgba(217,164,65,.7);}
.version-pill--old b{color:#F0D9A8;}
.header-cta{font-size:.82rem;padding:.5rem .8rem;}

.nav-toggle{
  display:none;
  align-items:center;
  gap:.5rem;
  padding:.48rem .7rem;
  border:1px solid var(--line-strong);
  border-radius:var(--radius);
  background:rgba(11,27,43,.55);
  color:var(--paper-100);
  font-size:.82rem;
  font-weight:800;
  letter-spacing:.1em;
}
.nav-toggle:hover{background:var(--ink-700);}
.nav-toggle-bars{display:inline-flex;flex-direction:column;gap:3px;width:16px;}
.nav-toggle-bars i{display:block;height:2px;border-radius:2px;background:var(--orange);transition:transform var(--speed) ease,opacity var(--speed) ease;}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(1){transform:translateY(5px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(3){transform:translateY(-5px) rotate(-45deg);}

/* ---------- 8. 页脚 ---------- */
.site-footer{
  margin-top:clamp(3rem,8vw,6rem);
  background:linear-gradient(180deg, var(--ink-800), var(--ink-900));
  border-top:3px solid var(--orange);
  color:var(--paper-200);
}
.footer-shell{padding-block:clamp(2rem,5vw,3.4rem) 1.2rem;}
.footer-grid{
  display:grid;
  grid-template-columns:1.35fr 1fr 1fr 1.35fr;
  gap:clamp(1.4rem,3.5vw,2.4rem);
}
.footer-col{display:grid;gap:.65rem;align-content:start;}
.footer-col--brand{gap:.7rem;}
.brand--footer{margin-bottom:.2rem;}
.footer-sign{
  font-size:1rem;
  font-weight:800;
  letter-spacing:.14em;
  color:var(--paper-100);
  max-width:none;
}
.footer-sign::before{
  content:"";
  display:block;
  width:44px;
  height:3px;
  margin-bottom:.55rem;
  background:var(--orange);
}
.footer-note{font-size:.85rem;color:var(--slate);max-width:34ch;}
.footer-icp{font-size:.78rem;color:var(--paper-200);opacity:.75;}
.footer-title{
  font-family:var(--font-mono);
  font-size:.74rem;
  font-weight:700;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--amber);
  padding-bottom:.5rem;
  border-bottom:1px dashed var(--line);
}
.footer-links{list-style:none;display:grid;gap:.4rem;}
.footer-link{
  display:inline-block;
  font-size:.9rem;
  color:var(--paper-200);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color var(--speed) ease,border-color var(--speed) ease;
}
.footer-link:hover{color:var(--orange);border-bottom-color:rgba(242,107,33,.6);}

.footer-contact{list-style:none;display:grid;gap:.55rem;}
.footer-contact li{display:grid;gap:.15rem;}
.contact-key{
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--slate);
}
.contact-value{
  font-size:.9rem;
  font-weight:600;
  color:var(--paper-100);
  overflow-wrap:anywhere;
}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.8rem;
  margin-top:clamp(1.6rem,4vw,2.4rem);
  padding-top:1rem;
  border-top:1px dashed var(--line);
}
.footer-copy{font-size:.82rem;color:var(--slate);max-width:none;}
.back-to-top{
  padding:.42rem .8rem;
  border:1px solid var(--line-strong);
  border-radius:var(--radius);
  background:rgba(11,27,43,.6);
  color:var(--paper-200);
  font-size:.78rem;
  font-weight:800;
  letter-spacing:.12em;
  transition:background-color var(--speed) ease,color var(--speed) ease,border-color var(--speed) ease;
}
.back-to-top:hover{background:var(--orange);border-color:var(--orange);color:#0B1B2B;}

/* ---------- 9. 响应式 ---------- */
@media (max-width:1180px){
  .status-chip{display:none;}
  .nav-link{padding:.44rem .6rem;font-size:.82rem;}
}
@media (max-width:1024px){
  .footer-grid{grid-template-columns:1fr 1fr;}
}
@media (max-width:900px){
  .site-header{position:sticky;}
  .header-shell{gap:.5rem .8rem;}
  .header-ident{flex:1 1 auto;}
  .site-nav{
    display:none;
    flex:1 0 100%;
    order:3;
    justify-content:stretch;
    border-top:1px solid var(--line);
    margin-top:.2rem;
  }
  .site-nav[data-open]{display:block;animation:navDrop var(--speed) ease-out;}
  .nav-list{flex-direction:column;gap:2px;justify-content:stretch;padding-block:.5rem;}
  .nav-item{flex:1 1 auto;}
  .nav-link{
    width:100%;
    justify-content:flex-start;
    padding:.7rem .85rem;
    border-color:var(--line);
    background:rgba(11,27,43,.55);
    font-size:.9rem;
  }
  .nav-toggle{display:inline-flex;}
  @keyframes navDrop{from{opacity:0;transform:translateY(-6px);}to{opacity:1;transform:none;}}
}
@media (max-width:640px){
  .footer-grid{grid-template-columns:1fr;}
  .version-pill--old{display:none;}
  .header-cta{display:none;}
  .footer-bottom{justify-content:flex-start;}
  .brand-plate{min-width:52px;font-size:.85rem;}
}
@media (max-width:420px){
  .brand-sub{display:none;}
  .status-chip{display:none;}
}

/* ---------- 10. 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;
  }
}