:root{
  --ink-980:#0B1622;
  --ink-800:#14263A;
  --ink-700:#1B3247;
  --paper-100:#F4EEE3;
  --paper-200:#E3D9C6;
  --paper-300:#CBBFA8;
  --orange:#E4661F;
  --cyan:#38E1CE;
  --silver-400:#9AA6B2;
  --silver-600:#5A6A78;
  --red-print:#C8452F;
  --green:#3FA97A;
  --line-dark:rgba(154,166,178,.26);
  --line-soft:rgba(154,166,178,.15);
  --line-light:rgba(11,22,34,.14);
  --font-display:"Songti SC","Noto Serif SC","Source Han Serif SC",Georgia,"Times New Roman",serif;
  --font-sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
  --edge:clamp(16px,4.2vw,56px);
  --maxw:1380px;
  --gap:clamp(16px,2vw,24px);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper-100);
  color:var(--ink-980);
  font-family:var(--font-sans);
  font-size:clamp(.95rem,.35vw + .88rem,1.0625rem);
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg{max-width:100%}
a{color:inherit}
h1,h2,h3,h4,h5{font-family:var(--font-display);font-weight:700;letter-spacing:-.01em;line-height:1.2;margin:0}
p{margin:0 0 1em}
ul,ol{margin:0;padding:0}
button{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1;font-weight:600;letter-spacing:.01em}
.skip-link{
  position:absolute;left:14px;top:-70px;z-index:200;
  background:var(--cyan);color:var(--ink-980);
  padding:10px 16px;font-size:.8125rem;font-weight:700;letter-spacing:.08em;
  text-decoration:none;transition:top .2s ease;
}
.skip-link:focus{top:14px}

/* ---------- HEADER ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:var(--ink-980);
  color:var(--paper-100);
  border-bottom:1px solid var(--line-dark);
}
.site-header::before{
  content:"";display:block;height:5px;
  background-image:repeating-linear-gradient(90deg,var(--silver-600) 0 1px,transparent 1px 22px);
  opacity:.55;
}
.header-frame{
  position:relative;
  max-width:var(--maxw);
  margin:0 auto;
  padding:15px var(--edge);
  display:flex;align-items:center;justify-content:space-between;
  gap:clamp(14px,3vw,40px);
}
.brand{display:inline-flex;align-items:center;gap:12px;text-decoration:none;color:inherit;flex:0 0 auto}
.brand__mark{
  position:relative;width:36px;height:36px;flex:0 0 auto;
  border:1px solid var(--orange);display:grid;place-items:center;
}
.brand__mark::after{
  content:"";position:absolute;right:-5px;bottom:-5px;width:12px;height:12px;
  border-right:1px solid rgba(228,102,31,.45);border-bottom:1px solid rgba(228,102,31,.45);
}
.brand__mark-core{width:12px;height:12px;background:var(--orange);transition:background-color .2s ease}
.brand:hover .brand__mark-core{background:var(--cyan)}
.brand__text{display:flex;flex-direction:column;line-height:1.15}
.brand__name{font-family:var(--font-display);font-size:1.15rem;font-weight:700;letter-spacing:-.01em}
.brand__sub{margin-top:5px;font-family:var(--font-mono);font-size:.625rem;letter-spacing:.16em;color:var(--silver-400)}
.site-nav{display:flex;align-items:center}
.site-nav__title{display:none}
.site-nav__list{display:flex;align-items:center;gap:clamp(8px,1.5vw,26px);list-style:none;counter-reset:nav}
.site-nav__item{counter-increment:nav}
.site-nav__link{
  position:relative;display:inline-block;
  padding:6px 2px 10px;
  font-size:.875rem;font-weight:600;letter-spacing:.05em;
  color:var(--paper-200);text-decoration:none;white-space:nowrap;
  transition:color .18s ease;
}
.site-nav__link::before{
  content:counter(nav,decimal-leading-zero);
  display:block;margin-bottom:3px;
  font-family:var(--font-mono);font-size:.5625rem;letter-spacing:.12em;
  color:var(--silver-600);transition:color .18s ease;
}
.site-nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:4px;height:2px;
  background:var(--orange);transform:scaleX(0);transform-origin:left center;
  transition:transform .22s cubic-bezier(.4,0,.2,1);
}
.site-nav__link:hover,.site-nav__link:focus-visible{color:#fff}
.site-nav__link:hover::before{color:var(--cyan)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:#fff}
.site-nav__link[aria-current="page"]::before{color:var(--orange)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}
.nav-toggle{
  display:none;align-items:center;gap:10px;
  background:transparent;border:1px solid var(--line-dark);
  color:var(--paper-100);padding:9px 12px;cursor:pointer;
  font-size:.75rem;font-weight:700;letter-spacing:.16em;
  transition:border-color .2s ease,color .2s ease;
}
.nav-toggle:hover,.nav-toggle:focus-visible{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:3px;width:16px;flex:0 0 auto}
.nav-toggle__bars span{display:block;height:1.5px;background:currentColor;transition:transform .2s ease,opacity .15s ease}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(4.5px) 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(-4.5px) rotate(-45deg)}
.header-status{background:var(--ink-800);border-top:1px solid var(--line-soft)}
.status-strip{
  max-width:var(--maxw);margin:0 auto;padding:7px var(--edge);
  display:flex;flex-wrap:wrap;gap:6px clamp(14px,2.4vw,36px);
  list-style:none;
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.04em;
  color:var(--silver-400);
}
.status-strip__item{display:inline-flex;align-items:center;gap:7px}
.status-strip__key{color:var(--silver-600)}
.status-strip__val{color:var(--paper-200);font-weight:600}
.status-strip__dot{
  width:6px;height:6px;border-radius:50%;flex:0 0 auto;
  background:var(--green);box-shadow:0 0 0 3px rgba(63,169,122,.16);
}
.scroll-progress{
  position:absolute;left:0;bottom:-1px;height:2px;width:0;z-index:5;
  background:linear-gradient(90deg,var(--orange),var(--cyan));
  transition:width .12s linear;
}
.nav-scrim{
  position:fixed;inset:0;z-index:70;
  background:rgba(6,12,18,.66);
  opacity:0;pointer-events:none;
  transition:opacity .22s ease;
}
.nav-scrim[data-open]{opacity:1;pointer-events:auto}

/* ---------- FOOTER ---------- */
.site-footer{
  position:relative;
  background:var(--ink-980);
  color:var(--paper-200);
  border-top:1px solid var(--line-dark);
}
.site-footer::before{
  content:"";display:block;height:5px;
  background-image:repeating-linear-gradient(90deg,var(--silver-600) 0 1px,transparent 1px 22px);
  opacity:.55;
}
.footer-ledger{
  max-width:var(--maxw);margin:0 auto;
  padding:clamp(36px,5vw,64px) var(--edge) clamp(28px,3.5vw,44px);
  display:grid;grid-template-columns:1.25fr 1fr 1.15fr .9fr;
  gap:clamp(24px,3vw,44px);
}
.footer-col__title{
  display:flex;align-items:center;gap:10px;margin:0 0 18px;
  font-family:var(--font-mono);font-size:.6875rem;font-weight:600;
  letter-spacing:.2em;text-transform:uppercase;color:var(--silver-400);
}
.footer-col__title::before{content:"";width:16px;height:2px;background:var(--orange);flex:0 0 auto}
.footer-col__more{
  display:inline-flex;align-items:center;gap:8px;
  font-size:.8125rem;font-weight:600;letter-spacing:.04em;
  color:var(--cyan);text-decoration:none;
  border-bottom:1px solid rgba(56,225,206,.35);padding-bottom:3px;
  transition:border-color .2s ease,color .2s ease;
}
.footer-col__more::after{content:"→";font-family:var(--font-mono);transition:transform .2s ease}
.footer-col__more:hover{border-color:var(--cyan)}
.footer-col__more:hover::after{transform:translateX(3px)}
.tag-list{display:flex;flex-wrap:wrap;gap:6px;list-style:none;margin:0 0 18px;padding:0}
.tag{
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.02em;
  padding:4px 8px;color:var(--paper-200);
  border:1px solid var(--line-dark);
  background:rgba(244,238,227,.03);
  transition:border-color .18s ease,color .18s ease;
}
.tag:hover{border-color:var(--orange);color:var(--orange)}
.footer-list{list-style:none;padding:0;display:flex;flex-direction:column;gap:12px}
.footer-list__key{
  display:block;margin-bottom:4px;
  font-family:var(--font-mono);font-size:.625rem;letter-spacing:.16em;
  color:var(--silver-600);
}
.footer-list__val{font-size:.875rem;line-height:1.65;color:var(--paper-200)}
.footer-list--links{gap:10px}
.footer-list--links a{
  font-size:.875rem;color:var(--paper-200);text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s ease,border-color .2s ease;
}
.footer-list--links a:hover{color:var(--cyan);border-color:var(--cyan)}
.footer-note{
  margin:16px 0 0;font-size:.75rem;line-height:1.7;
  color:var(--silver-400);max-width:34ch;
}
.copy-btn{
  display:inline-flex;align-items:center;gap:10px;
  background:transparent;border:1px solid var(--line-dark);
  color:var(--paper-100);cursor:pointer;
  padding:7px 10px;max-width:100%;
  font-family:var(--font-mono);font-size:.8125rem;letter-spacing:.01em;
  transition:border-color .2s ease,color .2s ease;
}
.copy-btn:hover{border-color:var(--cyan);color:var(--cyan)}
.copy-btn__text{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.copy-btn__hint{font-size:.625rem;letter-spacing:.14em;color:var(--silver-600);flex:0 0 auto}
.copy-btn[data-copied="true"]{border-color:var(--green);color:var(--green)}
.copy-btn[data-copied="true"] .copy-btn__hint{color:var(--green)}
.footer-base{
  max-width:var(--maxw);margin:0 auto;
  padding:18px var(--edge) 30px;
  border-top:1px solid var(--line-soft);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 28px;
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.03em;
  color:var(--silver-400);
}
.footer-base__item{margin:0}
.footer-base__item--note{color:var(--silver-600)}

/* ---------- SHARED COMPONENTS ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 20px;border:1px solid transparent;cursor:pointer;
  font-family:var(--font-sans);font-size:.8125rem;font-weight:700;letter-spacing:.08em;
  text-decoration:none;
  transition:background-color .2s ease,color .2s ease,border-color .2s ease;
}
.btn--primary{background:var(--orange);border-color:var(--orange);color:#12100C}
.btn--primary:hover{background:#c9540f;border-color:#c9540f;color:#fff}
.btn--ghost{background:transparent;border-color:var(--line-dark);color:var(--paper-100)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.btn--ink{background:var(--ink-980);border-color:var(--ink-980);color:var(--paper-100)}
.btn--ink:hover{background:var(--ink-700);border-color:var(--ink-700)}
.breadcrumb{
  max-width:var(--maxw);margin:0 auto;padding:14px var(--edge);
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  border-bottom:1px solid var(--line-light);
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.06em;
  color:var(--silver-600);
}
.breadcrumb a{color:var(--silver-600);text-decoration:none;transition:color .18s ease}
.breadcrumb a:hover{color:var(--orange)}
.breadcrumb__sep{color:var(--silver-400)}
.breadcrumb__current{color:var(--ink-980)}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 var(--edge)}
.wrap--narrow{max-width:920px}
.prose{max-width:62ch;line-height:1.8}
.prose p{margin:0 0 1.2em}
.prose h2{margin:2.4em 0 .8em;font-size:clamp(1.5rem,3vw,2.25rem)}
.prose h3{margin:2em 0 .6em;font-size:clamp(1.15rem,2vw,1.5rem)}
.prose ul,.prose ol{padding-left:1.3em;margin:0 0 1.2em}
.prose li{margin-bottom:.5em}
.prose strong{font-weight:700}
.grid{display:grid;gap:var(--gap)}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gap)}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.panel{
  position:relative;
  background:var(--paper-100);
  border:1px solid var(--line-light);
  padding:clamp(20px,2.6vw,32px);
}
.panel--ink{background:var(--ink-980);border-color:var(--line-dark);color:var(--paper-100)}
.panel--stack{background:var(--paper-200);border-color:rgba(11,22,34,.1)}
.media{
  position:relative;display:block;overflow:hidden;
  background:var(--ink-800);
  border:1px solid var(--line-dark);
  aspect-ratio:var(--media-ratio,4/3);
}
.media > img{
  width:100%;height:100%;object-fit:cover;display:block;
  filter:saturate(.72) contrast(1.05) brightness(.96);
}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.45;
  background-image:repeating-linear-gradient(0deg,rgba(154,166,178,.09) 0 1px,transparent 1px 4px);
}
.media--wide{--media-ratio:16/9}
.media--tall{--media-ratio:3/4}
.media--square{--media-ratio:1/1}
.media--placeholder{
  background-image:repeating-linear-gradient(45deg,rgba(154,166,178,.09) 0 2px,transparent 2px 12px);
}
.media__caption{
  position:absolute;left:0;right:0;bottom:0;z-index:2;
  padding:12px 14px;
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.04em;
  color:var(--paper-200);
  background:linear-gradient(180deg,transparent,rgba(11,22,34,.88));
}
.label{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font-mono);font-size:.625rem;letter-spacing:.14em;
  padding:4px 8px;border:1px solid var(--line-dark);color:var(--silver-400);
}
.label--orange{border-color:rgba(228,102,31,.5);color:var(--orange)}
.label--red{border-color:rgba(200,69,47,.5);color:var(--red-print)}
.dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--green);flex:0 0 auto}
.dot--warn{background:var(--orange)}
.dot--idle{background:var(--silver-600)}
.dot--live{box-shadow:0 0 0 3px rgba(63,169,122,.18)}
.rule{height:1px;border:0;background:var(--line-light);margin:clamp(28px,4vw,52px) 0}
.rule--dark{background:var(--line-dark)}
.edge-ruler{position:relative}
.edge-ruler::before,.edge-ruler::after{
  content:"";position:absolute;top:0;bottom:0;width:1px;pointer-events:none;opacity:.4;
  background-image:repeating-linear-gradient(180deg,var(--silver-400) 0 1px,transparent 1px 48px);
}
.edge-ruler::before{left:0}
.edge-ruler::after{right:0}

/* ---------- RESPONSIVE ---------- */
@media (max-width:1040px){
  .footer-ledger{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:920px){
  .nav-toggle{display:inline-flex}
  .brand__mark::after{display:none}
  body[data-nav-open]{overflow:hidden}
  .site-nav{
    position:fixed;top:0;bottom:0;left:0;z-index:90;
    display:block;width:min(330px,88vw);
    padding:26px 24px 34px 26px;
    background:var(--ink-800);
    border-right:1px solid var(--line-dark);
    overflow-y:auto;
    transform:translateX(-101%);
    transition:transform .28s cubic-bezier(.4,0,.2,1);
  }
  .site-nav::before{
    content:"";position:absolute;left:13px;top:0;bottom:0;width:1px;opacity:.5;
    background-image:repeating-linear-gradient(180deg,var(--silver-400) 0 1px,transparent 1px 30px);
  }
  .site-nav[data-open]{transform:translateX(0)}
  .site-nav__title{
    display:block;margin:0 0 20px;padding-left:6px;
    font-family:var(--font-mono);font-size:.625rem;letter-spacing:.24em;
    color:var(--silver-600);text-transform:uppercase;
  }
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .site-nav__item{border-bottom:1px solid var(--line-soft)}
  .site-nav__link{
    display:flex;align-items:center;gap:14px;
    padding:16px 6px;font-size:.9375rem;white-space:normal;
  }
  .site-nav__link::before{margin:0;order:-1;font-size:.6875rem}
  .site-nav__link::after{left:6px;right:6px;bottom:8px}
  .header-frame{padding-top:13px;padding-bottom:13px}
}
@media (max-width:760px){
  .grid-3{grid-template-columns:1fr}
  .grid-2{grid-template-columns:1fr}
  .grid-12{grid-template-columns:repeat(4,minmax(0,1fr))}
  .footer-base{flex-direction:column;align-items:flex-start}
}
@media (max-width:620px){
  .footer-ledger{grid-template-columns:1fr;gap:34px}
  .footer-note{max-width:none}
}
@media (max-width:420px){
  .brand__sub{display:none}
  .brand__mark{width:30px;height:30px}
  .nav-toggle__text{display:none}
  .nav-toggle{padding:10px}
  .status-strip{font-size:.625rem;gap:5px 14px}
}
@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;
  }
}