:root{
  --indigo-900:#0F1B33;
  --indigo-700:#1C2E54;
  --indigo-500:#2E4A85;
  --paper:#F6F1E7;
  --paper-hi:#FFFCF4;
  --ink:#23262E;
  --stone:#6E7280;
  --red:#C4402E;
  --teal:#17786B;
  --ochre:#D9A227;
  --mist:#A8D8CE;
  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong",serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular","Menlo","Consolas",monospace;
  --ease:cubic-bezier(.2,.8,.2,1);
  --shell:1180px;
  --cut:14px;
  --line-dark:rgba(246,241,231,.16);
  --line-light:rgba(35,38,46,.14);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:1rem;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
}
h1,h2,h3,h4,h5{
  margin:0;
  font-family:var(--font-display);
  font-weight:900;
  line-height:1.05;
  letter-spacing:-.02em;
}
p{margin:0 0 1.4em}
p:last-child{margin-bottom:0}
ul[class],ol[class]{list-style:none;margin:0;padding:0}
img{display:block;max-width:100%}
a{color:var(--indigo-500);text-underline-offset:.25em;text-decoration-thickness:1px}
button{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--red);outline-offset:3px}
.site-header :focus-visible,.site-footer :focus-visible{outline-color:var(--ochre)}
.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;
}

/* ---------- layout ---------- */
.container{width:min(var(--shell),100% - 3rem);margin-inline:auto}
.container--narrow{width:min(760px,100% - 3rem);margin-inline:auto}
.section{padding-block:clamp(3rem,7vw,6rem)}
.section__head{display:grid;gap:.75rem;margin-bottom:clamp(1.5rem,3vw,2.5rem)}
.eyebrow{
  margin:0;font-family:var(--font-mono);font-size:.76rem;
  letter-spacing:.22em;text-transform:uppercase;color:var(--stone);
}
.section-num{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:clamp(2.6rem,6vw,4.2rem);line-height:.9;color:var(--red);
  letter-spacing:-.04em;
}
.rule-slash{height:1px;border:0;margin:0;background:linear-gradient(90deg,var(--ochre),rgba(217,162,39,0))}
.prose{max-width:36em}
.prose p{margin-bottom:1.4em}
.prose strong,.prose b{font-weight:700}
.prose strong::before,.prose b::before{content:"▍";color:var(--red);margin-inline-end:.15em}
.muted{color:var(--stone);font-size:.86rem}

.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(1rem,2vw,1.75rem)}
.span-4{grid-column:span 4}
.span-5{grid-column:span 5}
.span-6{grid-column:span 6}
.span-7{grid-column:span 7}
.span-8{grid-column:span 8}
.offset-1{grid-column-start:2}

.band--dark{background:var(--indigo-900);color:var(--paper)}
.band--paper{background:var(--paper);color:var(--ink)}
.band--white{background:var(--paper-hi);color:var(--ink)}
.band--dark h1,.band--dark h2,.band--dark h3,.band--dark h4{color:var(--paper-hi)}
.band--dark a{color:var(--mist)}
.band--dark .eyebrow{color:var(--mist)}
.band--dark .muted{color:rgba(246,241,231,.66)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.85rem 1.5rem;font-size:.94rem;font-weight:600;line-height:1.2;
  letter-spacing:.02em;text-decoration:none;cursor:pointer;
  border:1px solid transparent;background:transparent;
  clip-path:polygon(0 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%);
  transition:background-color .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease);
}
.btn--primary{background:var(--red);color:var(--paper-hi)}
.btn--primary:hover{background:#a83526}
.btn--ghost{background:transparent;color:var(--indigo-500);border-color:var(--indigo-500)}
.btn--ghost:hover{background:var(--indigo-500);color:var(--paper-hi)}
.btn--light{background:transparent;color:var(--paper-hi);border-color:rgba(246,241,231,.5)}
.btn--light:hover{border-color:var(--ochre);color:var(--ochre)}

/* ---------- header ---------- */
.site-header{
  position:relative;
  background:var(--indigo-900);
  color:var(--paper);
  border-bottom:1px solid var(--line-dark);
}
.scroll-progress{
  position:fixed;top:0;left:0;z-index:80;
  height:3px;width:0;background:linear-gradient(90deg,var(--red),var(--ochre));
  transition:width .1s linear;
}
.skip-link{
  position:absolute;top:.5rem;left:.5rem;z-index:90;
  padding:.6rem 1rem;background:var(--paper-hi);color:var(--indigo-900);
  font-size:.85rem;font-weight:600;text-decoration:none;
  transform:translateY(-160%);
  transition:transform .2s var(--ease);
}
.skip-link:focus-visible{transform:translateY(0)}

.masthead{
  width:min(var(--shell),100% - 3rem);margin-inline:auto;
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;
  gap:1rem;padding-block:1.5rem 1.15rem;
}
.masthead__rail{
  justify-self:start;width:84px;height:2px;
  background:repeating-linear-gradient(90deg,var(--ochre) 0 7px,transparent 7px 13px);
}
.masthead__brand{justify-self:center;text-align:center}
.brand-mark{display:inline-flex;flex-direction:column;gap:.35rem;text-decoration:none;color:inherit}
.brand-title{
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(1.55rem,1.1rem + 1.4vw,2.15rem);
  line-height:1.05;letter-spacing:-.02em;color:var(--paper-hi);
}
.brand-tagline{
  font-size:.74rem;letter-spacing:.2em;color:rgba(246,241,231,.62);
}
.masthead__status{
  justify-self:end;display:inline-flex;align-items:center;gap:.5rem;
  margin:0;font-size:.8rem;letter-spacing:.04em;color:rgba(246,241,231,.8);
}
.status-lamp{
  width:8px;height:8px;border-radius:50%;background:var(--teal);
  box-shadow:0 0 0 3px rgba(23,120,107,.28);
}

.nav-bar{
  width:min(var(--shell),100% - 3rem);margin-inline:auto;
  display:flex;align-items:center;gap:.75rem;
  border-top:1px solid var(--line-dark);
}
.nav-toggle{
  display:none;align-items:center;gap:.55rem;
  padding:.75rem 0;background:transparent;border:0;cursor:pointer;
  color:var(--paper-hi);font-size:.85rem;letter-spacing:.12em;
}
.nav-toggle__bars{position:relative;width:20px;height:8px;display:block}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:20px;height:2px;
  background:var(--ochre);transition:transform .25s var(--ease),top .25s var(--ease);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{top:6px}
.site-header[data-open] .nav-toggle__bars::before{top:3px;transform:rotate(45deg)}
.site-header[data-open] .nav-toggle__bars::after{top:3px;transform:rotate(-45deg)}

.site-nav{flex:1;overflow-x:auto;scrollbar-width:none}
.site-nav::-webkit-scrollbar{display:none}
.site-nav__list{
  display:flex;align-items:center;justify-content:center;gap:clamp(.9rem,3vw,2.4rem);
  width:max-content;min-width:100%;padding-inline:.25rem;
}
.site-nav__link{
  position:relative;display:inline-block;padding:.95rem .15rem;
  font-size:.92rem;letter-spacing:.06em;color:rgba(246,241,231,.72);
  text-decoration:none;transition:color .25s var(--ease);
}
.site-nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:.42rem;height:2px;
  background:var(--red);transform:scaleX(0);transform-origin:left;
  transition:transform .3s var(--ease);
}
.site-nav__link:hover{color:var(--paper-hi)}
.site-nav__link:hover::after{transform:scaleX(.45)}
.site-nav__link[aria-current="page"]{color:var(--paper-hi);font-weight:600}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}

/* ---------- footer ---------- */
.site-footer{
  position:relative;background:var(--indigo-900);color:var(--paper);
  padding-bottom:clamp(1.75rem,4vw,3rem);
}
.site-footer::before{
  content:"";display:block;height:6px;
  background:linear-gradient(90deg,
    var(--red) 0 20%,var(--ochre) 20% 40%,var(--teal) 40% 60%,
    var(--indigo-500) 60% 80%,var(--mist) 80% 100%);
}
.footer-inner{width:min(var(--shell),100% - 3rem);margin-inline:auto}
.footer-grid{
  display:grid;grid-template-columns:1fr 1fr 1.5fr;gap:clamp(1.5rem,4vw,3rem);
  padding-block:clamp(2rem,5vw,3.25rem) clamp(1.5rem,3vw,2.25rem);
  border-bottom:1px solid var(--line-dark);
}
.footer-title{
  margin:0 0 1rem;font-family:var(--font-display);font-size:1rem;font-weight:900;
  letter-spacing:.02em;color:var(--paper-hi);
}
.footer-title::before{content:"／";color:var(--ochre);font-weight:400;margin-inline-end:.35em}
.footer-list{display:grid;gap:.55rem;font-size:.92rem}
.footer-list a{color:rgba(246,241,231,.8);text-decoration:none;transition:color .2s var(--ease)}
.footer-list a:hover{color:var(--ochre)}
.footer-list--contact{gap:.7rem}
.footer-list--contact li{
  display:grid;grid-template-columns:5.2em 1fr;gap:.6rem;
  font-size:.9rem;line-height:1.6;color:rgba(246,241,231,.86);
  word-break:break-word;
}
.footer-key{color:var(--mist);font-size:.8rem;letter-spacing:.06em}
.footer-note{margin:1.1rem 0 0;font-size:.78rem;line-height:1.7;color:rgba(246,241,231,.6)}
.footer-bottom{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:.75rem 1.5rem;
  padding-top:clamp(1.25rem,3vw,1.75rem);
  font-size:.8rem;color:rgba(246,241,231,.58);
}
.footer-copy,.footer-icp{margin:0}
.footer-icp{font-family:var(--font-mono);letter-spacing:.02em}

/* ---------- breadcrumb ---------- */
.breadcrumb{margin-block:clamp(1.5rem,3vw,2.25rem) 0}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:.4rem;font-size:.8rem;color:var(--stone)}
.breadcrumb__item{display:inline-flex;align-items:center;gap:.4rem}
.breadcrumb__item+.breadcrumb__item::before{content:"／";color:var(--ochre)}
.breadcrumb__item a{color:var(--indigo-500);text-decoration:none}
.breadcrumb__item a:hover{text-decoration:underline}
.breadcrumb__item[aria-current="page"]{color:var(--stone)}

/* ---------- media ---------- */
.media-frame{
  position:relative;overflow:hidden;aspect-ratio:16/10;
  background:linear-gradient(155deg,var(--indigo-700),var(--indigo-900) 58%,var(--indigo-500));
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,0 100%);
}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    linear-gradient(135deg,transparent 38%,rgba(168,216,206,.22) 52%,transparent 66%),
    linear-gradient(0deg,rgba(15,27,51,.6),rgba(15,27,51,0) 70%);
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}

/* ---------- status panel ---------- */
.status-panel{
  background:var(--indigo-700);color:var(--paper);
  padding:clamp(1.15rem,2.5vw,1.6rem);
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,0 100%);
}
.status-row{
  display:flex;align-items:center;gap:.65rem;
  padding-block:.6rem;border-bottom:1px solid var(--line-dark);
  font-size:.88rem;
}
.status-row:last-child{border-bottom:0}
.status-label{flex:1;color:rgba(246,241,231,.86)}
.lamp{width:8px;height:8px;border-radius:50%;flex:none;background:var(--stone)}
.lamp--ok{background:var(--teal);box-shadow:0 0 0 3px rgba(23,120,107,.26)}
.lamp--wait{background:var(--ochre);box-shadow:0 0 0 3px rgba(217,162,39,.22)}

/* ---------- index list ---------- */
.index-list{display:grid;border-top:1px solid var(--line-light)}
.index-item{
  display:grid;grid-template-columns:auto 1fr auto;align-items:baseline;gap:1rem;
  padding-block:clamp(.9rem,2vw,1.15rem);
  border-bottom:1px solid var(--line-light);
}
.index-item__num{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:.85rem;color:var(--red);letter-spacing:.04em;
}
.index-item__title{
  font-family:var(--font-display);font-weight:900;letter-spacing:-.01em;
  font-size:clamp(1.05rem,1rem + .4vw,1.3rem);line-height:1.25;
}
.index-item__title a{color:inherit;text-decoration:none}
.index-item__title a:hover{color:var(--red)}
.index-item__meta{font-size:.8rem;color:var(--stone);font-variant-numeric:tabular-nums}
.band--dark .index-list,.band--dark .index-item{border-color:var(--line-dark)}
.band--dark .index-item__meta{color:rgba(246,241,231,.6)}

/* ---------- toc ---------- */
.toc-list{display:grid;gap:.5rem;font-size:.86rem}
.toc-link{
  display:inline-block;padding:.2rem 0 .2rem .75rem;
  border-left:2px solid transparent;color:var(--stone);text-decoration:none;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.toc-link:hover{color:var(--ink)}
.toc-link.is-active{color:var(--red);border-color:var(--red);font-weight:600}
.band--dark .toc-link{color:rgba(246,241,231,.66)}
.band--dark .toc-link.is-active{color:var(--ochre);border-color:var(--ochre)}

/* ---------- tag ---------- */
.tag{
  display:inline-flex;align-items:center;gap:.35rem;
  padding:.2rem .55rem;font-size:.72rem;letter-spacing:.08em;
  color:var(--indigo-500);border:1px solid var(--indigo-500);
}
.tag--red{color:var(--red);border-color:var(--red)}
.band--dark .tag{color:var(--mist);border-color:rgba(168,216,206,.5)}

/* ---------- reveal ---------- */
[data-reveal]{
  opacity:0;transform:translateY(18px);
  transition:opacity .4s var(--ease),transform .4s var(--ease);
  transition-delay:calc(var(--reveal-i,0) * 80ms);
}
[data-reveal].is-visible{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1024px){
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-col--wide{grid-column:1 / -1}
}
@media (max-width:900px){
  .container,.container--narrow,.masthead,.nav-bar,.footer-inner{width:min(var(--shell),100% - 2.25rem)}
  .grid-12{grid-template-columns:repeat(4,minmax(0,1fr))}
  .span-4,.span-5,.span-6,.span-7,.span-8{grid-column:span 4}
  .offset-1{grid-column-start:1}
}
@media (max-width:820px){
  .masthead{grid-template-columns:1fr auto;gap:.75rem;padding-block:1.15rem .9rem}
  .masthead__rail{display:none}
  .masthead__brand{justify-self:start;text-align:left}
  .masthead__status{justify-self:end;font-size:.72rem}
  .brand-tagline{font-size:.68rem;letter-spacing:.14em}

  .nav-bar{flex-direction:column;align-items:stretch;gap:0;border-top:1px solid var(--line-dark)}
  .nav-toggle{display:inline-flex;justify-content:flex-start;width:100%}
  .site-nav{
    max-height:0;visibility:hidden;overflow:hidden;
    transition:max-height .35s var(--ease),visibility 0s linear .35s;
  }
  .site-header[data-open] .site-nav{
    max-height:30rem;visibility:visible;
    transition:max-height .35s var(--ease),visibility 0s linear 0s;
  }
  .site-nav__list{flex-direction:column;align-items:stretch;width:100%;gap:0;padding-inline:0}
  .site-nav__link{display:block;padding:.9rem .2rem;border-bottom:1px solid var(--line-dark);font-size:.95rem}
  .site-nav__link::after{bottom:0;height:2px}
  .site-nav__link:hover::after{transform:scaleX(1)}
}
@media (max-width:680px){
  .footer-grid{grid-template-columns:1fr;gap:1.75rem}
  .footer-col--wide{grid-column:auto}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:.4rem}
  .index-item{grid-template-columns:auto 1fr;gap:.5rem .75rem}
  .index-item__meta{grid-column:2;justify-self:start}
  .status-row{flex-wrap:wrap}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    transition-delay:0ms !important;
  }
  [data-reveal]{opacity:1;transform:none}
  .scroll-progress{transition:none}
  .site-nav__link::after{transition:none}
}