:root{
  --ink:#061A2F;
  --carbon:#0B0F14;
  --paper:#F6F1E7;
  --mist:#C9D2DC;
  --orange:#FF6A1A;
  --orange-soft:#FF8A4D;
  --cyan:#22D3EE;
  --umber:#1A1410;
  --red:#E8471C;
  --green:#7CFFB2;
  --fog:#7E93A8;
  --line:rgba(201,210,220,.18);
  --line-strong:rgba(201,210,220,.34);
  --line-ink:rgba(6,26,47,.14);
  --wrap:1280px;
  --gutter:clamp(16px,4vw,56px);
  --font-display:"Archivo Black","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --ease:cubic-bezier(.2,.7,.3,1);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
img,svg{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
[hidden]{display:none !important}
::selection{background:var(--orange);color:var(--carbon)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}

body{
  font-family:var(--font-body);
  font-size:17px;
  font-weight:400;
  line-height:1.75;
  color:var(--paper);
  background:var(--ink);
  -webkit-font-smoothing:antialiased;
}
p{max-width:68ch}
strong{font-weight:700}
#main-content{display:block;scroll-margin-top:96px}
main section[id]{scroll-margin-top:96px}

.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}

.section{padding-block:clamp(48px,7vw,100px);position:relative}
.section--ink{background:var(--ink);color:var(--paper)}
.section--carbon{background:var(--carbon);color:var(--paper)}
.section--paper{background:var(--paper);color:var(--ink)}
.section--paper .lead,.section--paper .prose{color:#25415C}
.section--paper .eyebrow{color:#B4451A}

.eyebrow{
  display:inline-flex;align-items:center;gap:9px;
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.2em;text-transform:uppercase;color:var(--cyan);
}
.eyebrow::before{content:"";width:22px;height:2px;background:currentColor}

.index-num{font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--fog)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}

.h-display{
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(38px,7.2vw,96px);line-height:.94;letter-spacing:-.03em;
}
.h-section{
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(26px,3.4vw,44px);line-height:1.04;letter-spacing:-.02em;
}
.h-sub{
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(19px,2vw,26px);line-height:1.2;letter-spacing:-.01em;
}
.lead{font-size:clamp(16px,1.3vw,18px);line-height:1.8;color:var(--mist);max-width:64ch}

.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:13px 22px;font-size:14px;font-weight:600;letter-spacing:.02em;
  border:1px solid transparent;position:relative;
  transition:background .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease),transform .16s var(--ease);
}
.btn::after{content:"";position:absolute;right:-1px;bottom:-1px;width:10px;height:10px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;opacity:.55}
.btn--primary{background:var(--orange);color:var(--carbon)}
.btn--primary:hover{background:var(--orange-soft);transform:translateY(-1px)}
.btn--ghost{border-color:var(--line-strong);color:var(--paper)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan);transform:translateY(-1px)}
.section--paper .btn--ghost{border-color:rgba(6,26,47,.28);color:var(--ink)}
.section--paper .btn--ghost:hover{border-color:#0E7C90;color:#0E7C90}

.grid{display:grid;gap:clamp(20px,3vw,40px)}
.grid--7-5{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.grid--9-3{grid-template-columns:minmax(0,9fr) minmax(0,3fr)}
.grid--4-8{grid-template-columns:minmax(0,4fr) minmax(0,8fr)}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}

.stack{display:flex;flex-direction:column;gap:16px}
.cluster{display:flex;flex-wrap:wrap;align-items:center;gap:12px}
.rule{border:0;border-top:1px solid var(--line);margin-block:clamp(24px,4vw,48px)}
.section--paper .rule{border-top-color:var(--line-ink)}

.panel{
  position:relative;
  background:rgba(11,15,20,.74);
  border:1px solid var(--line);
  border-top:2px solid var(--cyan);
  padding:clamp(18px,2.4vw,30px);
}
.panel--accent{border-top-color:var(--orange)}
.panel--slant{clip-path:polygon(0 0,100% 0,100% calc(100% - 22px),calc(100% - 22px) 100%,0 100%)}
.section--paper .panel{background:#FFFDF7;border-color:var(--line-ink);border-top-color:#0E7C90}

.figure{
  position:relative;overflow:hidden;
  background:linear-gradient(158deg,#0B0F14 0%,#061A2F 58%,#0E2A45 100%);
  border:1px solid var(--line);
}
.figure::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    repeating-linear-gradient(90deg,rgba(126,147,168,.16) 0 1px,transparent 1px 64px),
    repeating-linear-gradient(0deg,rgba(126,147,168,.12) 0 1px,transparent 1px 64px);
}
.figure__img{width:100%;height:100%;object-fit:cover;position:relative;z-index:1}
.figure__caption{
  position:absolute;left:0;bottom:0;z-index:2;
  padding:8px 12px;background:var(--carbon);color:var(--mist);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
}
.figure--wide{aspect-ratio:16/7}
.figure--tall{aspect-ratio:3/4}
.figure--square{aspect-ratio:1/1}
.figure--hero{aspect-ratio:21/9}
.figure--duotone .figure__img{filter:saturate(.82) contrast(1.08)}
@media (max-width:700px){
  .figure--wide,.figure--hero{aspect-ratio:4/3}
  .figure--tall{aspect-ratio:4/5}
}

.breadcrumb{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px;color:var(--fog)}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:rgba(126,147,168,.55)}
.breadcrumb__link{color:var(--mist)}
.breadcrumb__link:hover{color:var(--cyan)}
.breadcrumb__current{color:var(--paper)}
.section--paper .breadcrumb__current{color:var(--ink)}

.toc{font-size:14px}
.toc__title{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--fog);margin-bottom:12px;
}
.toc__list{display:grid;gap:2px;border-left:1px solid var(--line)}
.toc__item{margin-left:-1px}
.toc__link{
  display:block;padding:8px 0 8px 14px;color:var(--mist);
  border-left:2px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.toc__link:hover{color:var(--paper);border-left-color:var(--cyan)}
.toc__link.is-current{color:var(--orange);border-left-color:var(--orange)}
.section--paper .toc__link{color:#34506B}
.section--paper .toc__link:hover,.section--paper .toc__link.is-current{color:#B4451A;border-left-color:#B4451A}

.tag{
  display:inline-flex;align-items:center;gap:6px;padding:4px 9px;
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;
  border:1px solid var(--line-strong);color:var(--mist);
}
.tag--live{color:var(--green);border-color:rgba(124,255,178,.42)}
.tag--hot{color:var(--orange);border-color:rgba(255,106,26,.45)}

.prose{font-size:17px;line-height:1.85;color:var(--mist);max-width:68ch}
.prose > * + *{margin-top:1.1em}
.prose h2{
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(21px,2.4vw,30px);line-height:1.16;color:var(--paper);margin-top:1.7em;
}
.prose h3{font-size:clamp(17px,1.8vw,20px);font-weight:700;color:var(--paper);margin-top:1.5em}
.prose strong{color:var(--paper)}
.prose a{color:var(--cyan);border-bottom:1px solid rgba(34,211,238,.4)}
.prose ul{display:grid;gap:.55em}
.prose ul li{position:relative;padding-left:1.25em}
.prose ul li::before{content:"";position:absolute;left:0;top:.72em;width:8px;height:2px;background:var(--orange)}
.prose blockquote{border-left:3px solid var(--orange);padding-left:18px;color:var(--paper);font-size:19px;line-height:1.7}
.section--paper .prose{color:#25415C}
.section--paper .prose h2,.section--paper .prose h3,.section--paper .prose strong,.section--paper .prose blockquote{color:var(--ink)}
.section--paper .prose a{color:#0E7C90;border-bottom-color:rgba(14,124,144,.4)}

.meter{display:grid;gap:7px}
.meter__track{height:6px;background:rgba(201,210,220,.16);position:relative;overflow:hidden}
.meter__fill{height:100%;width:var(--value,50%);background:linear-gradient(90deg,var(--cyan),rgba(34,211,238,.35))}

/* ================= Header ================= */
.site-header{
  position:sticky;top:0;z-index:80;
  background:var(--carbon);
  color:var(--paper);
  border-top:3px solid var(--orange);
  border-bottom:1px solid var(--line);
  box-shadow:0 14px 34px rgba(0,0,0,.35);
}
.skip-link{
  position:fixed;left:12px;top:-72px;z-index:200;
  padding:11px 18px;background:var(--orange);color:var(--carbon);
  font-size:13px;font-weight:700;letter-spacing:.02em;
  transition:top .16s var(--ease);
}
.skip-link:focus{top:10px}

.cmdbar{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto auto;
  align-items:center;
  gap:clamp(10px,2vw,30px);
  min-height:70px;
  padding-block:9px;
  transition:min-height .16s var(--ease),padding .16s var(--ease);
}
.site-header.is-tight .cmdbar{min-height:54px;padding-block:4px}

.brand{display:inline-flex;align-items:center;gap:11px;flex:none}
.brand__mark{
  width:12px;height:28px;flex:none;
  background:var(--orange);
  clip-path:polygon(0 0,100% 14%,100% 100%,0 86%);
}
.brand__text{display:flex;flex-direction:column;gap:3px;line-height:1}
.brand__name{
  font-family:var(--font-display);font-weight:900;
  font-size:19px;letter-spacing:.01em;color:var(--paper);white-space:nowrap;
}
.brand__meta{
  font-family:var(--font-mono);font-size:9.5px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--fog);white-space:nowrap;
}
.brand:hover .brand__name{color:var(--orange)}
.brand:focus-visible{outline:2px solid var(--cyan);outline-offset:4px}

.cmdnav{min-width:0}
.cmdnav__list{display:flex;align-items:center;gap:2px;flex-wrap:wrap}
.cmdnav__link{
  display:inline-flex;align-items:baseline;gap:7px;
  padding:8px 10px;
  font-size:13.5px;font-weight:500;color:var(--mist);
  border-bottom:2px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease),background .16s var(--ease);
}
.cmdnav__idx{font-family:var(--font-mono);font-size:10px;letter-spacing:.08em;color:var(--fog)}
.cmdnav__link:hover{color:var(--paper);background:rgba(34,211,238,.1)}
.cmdnav__link[aria-current="page"]{color:var(--orange);border-bottom-color:var(--orange)}
.cmdnav__link[aria-current="page"] .cmdnav__idx{color:var(--orange)}
.cmdnav__foot{display:none}

.cmdbar__tools{display:flex;align-items:center;gap:8px;flex:none}
.tool{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 12px;
  font-size:12.5px;font-weight:500;letter-spacing:.04em;
  color:var(--mist);
  border:1px solid var(--line-strong);
  background:rgba(6,26,47,.55);
  transition:color .16s var(--ease),border-color .16s var(--ease),background .16s var(--ease);
}
.tool:hover{border-color:var(--cyan);color:var(--paper)}
.tool__dot{width:7px;height:7px;flex:none;background:var(--fog);border-radius:50%;transition:background .16s var(--ease)}
.tool__kbd{font-family:var(--font-mono);font-size:11px;color:var(--fog)}
.tool--fav.is-active{background:var(--orange);border-color:var(--orange);color:var(--carbon)}
.tool--fav.is-active .tool__dot{background:var(--carbon)}

.navtoggle{
  display:none;align-items:center;gap:9px;
  padding:9px 12px;
  border:1px solid var(--line-strong);
  color:var(--paper);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;
}
.navtoggle__bars{position:relative;display:block;width:16px;height:2px;background:currentColor}
.navtoggle__bars::before,.navtoggle__bars::after{
  content:"";position:absolute;left:0;width:16px;height:2px;background:currentColor;
  transition:transform .16s var(--ease),top .16s var(--ease);
}
.navtoggle__bars::before{top:-5px}
.navtoggle__bars::after{top:5px}
.navtoggle[aria-expanded="true"]{border-color:var(--orange);color:var(--orange)}
.navtoggle[aria-expanded="true"] .navtoggle__bars{background:transparent}
.navtoggle[aria-expanded="true"] .navtoggle__bars::before{top:0;transform:rotate(45deg)}
.navtoggle[aria-expanded="true"] .navtoggle__bars::after{top:0;transform:rotate(-45deg)}

.cmdpanel{
  position:absolute;top:100%;
  right:max(var(--gutter),calc(50vw - var(--wrap) / 2 + var(--gutter)));
  z-index:90;
  width:min(370px,calc(100vw - 24px));
  background:var(--umber);
  border:1px solid var(--line);
  border-top:2px solid var(--cyan);
  box-shadow:0 28px 64px rgba(0,0,0,.62);
}
.cmdpanel__inner{padding:14px}
.cmdpanel__label{
  display:block;margin-bottom:9px;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--fog);
}
.cmdpanel__input{
  width:100%;padding:10px 12px;
  background:rgba(246,241,231,.07);
  border:1px solid var(--line-strong);
  color:var(--paper);font-size:14px;
}
.cmdpanel__input::placeholder{color:rgba(126,147,168,.9)}
.cmdpanel__input:focus-visible{outline:2px solid var(--cyan);outline-offset:1px;border-color:var(--cyan)}
.cmdpanel__results{margin-top:10px;display:grid;gap:2px;max-height:290px;overflow:auto}
.cmdpanel__item{margin:0}
.cmdpanel__link{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  padding:9px 10px;font-size:14px;color:var(--mist);
  transition:background .14s var(--ease),color .14s var(--ease);
}
.cmdpanel__link:hover,.cmdpanel__link:focus-visible{background:rgba(34,211,238,.14);color:var(--paper);outline:none}
.cmdpanel__idx{font-family:var(--font-mono);font-size:10.5px;color:var(--fog)}
.cmdpanel__empty{padding:12px 10px;font-size:13px;color:var(--fog)}

.header__progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:rgba(201,210,220,.14);
}
.header__progress i{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--orange),var(--cyan));
  transition:width .12s linear;
}

/* ================= Footer ================= */
.site-footer{
  position:relative;
  background:var(--umber);
  color:var(--mist);
  border-top:3px solid var(--orange);
}
.footer__grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.5fr;
  gap:clamp(24px,4vw,56px);
  padding-block:clamp(40px,6vw,76px);
}
.footer__col{min-width:0}
.footer__brand{display:flex;flex-direction:column;gap:16px}
.brand--footer .brand__name{font-size:17px}
.brand--footer .brand__meta{font-size:9px}
.footer__line{font-size:14.5px;line-height:1.75;color:var(--mist);max-width:24ch}
.footer__title{
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.2em;text-transform:uppercase;color:var(--orange);
  margin-bottom:16px;
}
.footer__list{display:grid;gap:9px}
.footer__item{margin:0}
.footer__link{
  display:inline-block;font-size:14.5px;color:var(--mist);
  transition:color .16s var(--ease),transform .16s var(--ease);
}
.footer__link:hover{color:var(--paper);transform:translateX(3px)}
.footer__contact{display:grid;gap:9px;font-size:13.5px;line-height:1.7}
.footer__contact p{max-width:34ch}
.footer__contact .mono{color:var(--paper);white-space:nowrap}
.footer__note{color:var(--fog);font-size:12.5px;line-height:1.7;border-left:2px solid rgba(255,106,26,.5);padding-left:10px}
.footer__base{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px;
  padding-block:18px;
  border-top:1px solid var(--line);
}
.footer__mono{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;color:var(--fog);max-width:none}

.totop{
  position:fixed;right:clamp(14px,3vw,32px);bottom:clamp(14px,3vw,32px);z-index:70;
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 16px;
  background:var(--carbon);color:var(--paper);
  border:1px solid var(--line-strong);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.14em;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .18s var(--ease),transform .18s var(--ease),visibility .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease);
}
.totop.is-visible{opacity:1;visibility:visible;transform:none}
.totop:hover{border-color:var(--orange);color:var(--orange)}
.totop__icon{font-size:13px;line-height:1}

/* ================= Responsive ================= */
@media (max-width:1080px){
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer__grid{grid-template-columns:1fr 1fr}
  .cmdbar__tools .tool--cmd .tool__label{display:none}
}

@media (max-width:900px){
  .cmdbar{grid-template-columns:minmax(0,1fr) auto auto;min-height:62px}
  .site-header.is-tight .cmdbar{min-height:56px}
  .navtoggle{display:inline-flex}
  .cmdbar__tools .tool--cmd{display:none}
  .cmdnav{
    position:absolute;top:100%;left:0;right:0;
    display:none;
    background:var(--carbon);
    border-top:1px solid var(--line);
    border-bottom:2px solid var(--orange);
    padding:10px var(--gutter) 22px;
    max-height:calc(100dvh - 90px);
    overflow:auto;
    box-shadow:0 30px 60px rgba(0,0,0,.62);
  }
  .cmdnav[data-open]{display:block}
  .cmdnav__list{flex-direction:column;align-items:stretch;gap:0}
  .cmdnav__link{
    width:100%;justify-content:flex-start;
    padding:14px 2px;font-size:17px;
    border-bottom:1px solid var(--line);
  }
  .cmdnav__link[aria-current="page"]{border-bottom-color:var(--orange);background:rgba(255,106,26,.08)}
  .cmdnav__foot{
    display:block;margin-top:16px;
    font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--fog);
  }
  body.is-nav-open{overflow:hidden}
  .cmdpanel{left:0;right:0;top:100%;width:auto;border-left:0;border-right:0}
}

@media (max-width:860px){
  .grid--7-5,.grid--9-3,.grid--4-8,.grid--3,.grid--2{grid-template-columns:minmax(0,1fr)}
}

@media (max-width:640px){
  body{font-size:16px}
  .brand__name{font-size:16px}
  .brand__meta{font-size:8.5px;letter-spacing:.14em}
  .brand__mark{height:24px;width:10px}
  .footer__grid{grid-template-columns:1fr;gap:28px}
  .footer__base{justify-content:flex-start}
  .totop{padding:9px 13px;font-size:10.5px}
}

@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;
  }
}