/* 01 · reset */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ol,ul,figure,blockquote,address{margin:0}
ol,ul{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0}
img,svg{display:block;max-width:100%}
:where(a,button,summary,input,select,textarea):focus-visible{outline:2px solid var(--flame-soft);outline-offset:3px}

/* 02 · tokens */
:root{
  --ink:#0A0C0F;
  --panel:#12171D;
  --data:#1B2633;
  --line:#33414F;
  --text:#F2F5F7;
  --muted:#A9B6C4;
  --flame:#FF5A1F;
  --flame-soft:#FFB07A;
  --live:#20E3D2;
  --ember:#3A130C;
  --paper:#F4EFE7;
  --fix:#36D399;
  --rail-w:276px;
  --bar-h:68px;
  --font-head:"Barlow Condensed","Oswald","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-data:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --font-serif:"Songti SC","Noto Serif SC","Source Han Serif SC",SimSun,serif;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* 03 · base */
body{
  margin:0;
  padding-top:var(--bar-h);
  background:
    radial-gradient(1100px 620px at 88% -12%,rgba(255,90,31,.14),transparent 62%),
    radial-gradient(880px 540px at -8% 18%,rgba(32,227,210,.07),transparent 60%),
    var(--ink);
  color:var(--text);
  font-family:var(--font-body);
  font-size:15px;
  line-height:1.7;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-family:var(--font-head);font-weight:800;line-height:1.12;letter-spacing:.01em}
h1{font-size:clamp(2rem,5vw,3.4rem)}
h2{font-size:clamp(1.6rem,3.4vw,2.4rem)}
h3{font-size:1.375rem;line-height:1.25}
#main-content{display:block;scroll-margin-top:calc(var(--bar-h) + 12px)}

/* 04 · utilities */
.wrap{width:min(1140px,calc(100% - 40px));margin-inline:auto}
.wrap--narrow{width:min(820px,calc(100% - 40px))}
.stack>*+*{margin-top:1rem}
.grid{display:grid;gap:18px}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.rule{height:1px;border:0;background:var(--line);margin:0}
.kicker{font-family:var(--font-data);font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--muted)}
.section-num{font-family:var(--font-data);font-size:clamp(2rem,6vw,3.4rem);font-weight:700;line-height:1;letter-spacing:-.02em;color:var(--flame)}
.mono{font-family:var(--font-data);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.muted{color:var(--muted)}
.accent{color:var(--flame-soft)}
.live{color:var(--live)}

/* 05 · tags */
.tag{display:inline-flex;align-items:center;gap:6px;min-height:24px;padding:2px 10px;border:1px solid var(--line);border-radius:999px;background:rgba(27,38,51,.6);color:var(--muted);font-family:var(--font-data);font-size:11px;letter-spacing:.14em;text-transform:uppercase}
.tag--live{color:var(--live);border-color:rgba(32,227,210,.4)}
.tag--flame{color:var(--flame-soft);border-color:rgba(255,90,31,.45)}
.tag--paper{background:var(--paper);color:#12171D;border-color:var(--paper)}

/* 06 · buttons */
.btn{
  position:relative;display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:0 22px;border:1px solid transparent;
  font-family:var(--font-head);font-weight:700;font-size:15px;letter-spacing:.08em;text-transform:uppercase;
  color:var(--text);cursor:pointer;
  transition:color .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease),transform .2s var(--ease);
}
.btn:active{transform:translateY(1px)}
.btn--ghost{border-color:var(--line);background:rgba(27,38,51,.45);color:var(--text)}
.btn--ghost:hover{border-color:var(--flame);color:var(--flame-soft);background:rgba(255,90,31,.1)}
.btn--primary{color:#1A0A03;background:transparent;isolation:isolate;box-shadow:0 8px 26px rgba(255,90,31,.26)}
.btn--primary::before{
  content:"";position:absolute;inset:0;z-index:-1;
  background:linear-gradient(100deg,var(--flame),#FF7A3D);
  clip-path:polygon(12px 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%,0 12px);
  transition:background .2s var(--ease);
}
.btn--primary:hover::before{background:linear-gradient(100deg,#FF7030,var(--flame-soft))}
.btn--sm{min-height:38px;padding:0 14px;font-size:12.5px;letter-spacing:.12em}
.btn:focus-visible{outline:none;box-shadow:0 0 0 2px var(--ink),0 0 0 5px var(--flame-soft)}

/* 07 · skip link */
.skip-link{
  position:fixed;left:12px;top:-120px;z-index:200;
  padding:10px 16px;border:2px solid var(--flame);background:var(--paper);color:#0A0C0F;
  font-family:var(--font-head);font-weight:700;letter-spacing:.08em;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:12px}

/* 08 · header shell */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:120;
  background:linear-gradient(180deg,rgba(16,21,26,.99),rgba(10,12,15,.98));
  border-bottom:1px solid var(--line);
  color:var(--text);
}
.site-header__bar{
  display:flex;align-items:center;gap:12px;
  width:100%;min-height:var(--bar-h);padding:10px 16px;
}
.brand{display:flex;align-items:center;gap:10px;flex:1 1 auto;min-width:0}
.brand__mark{
  position:relative;flex:0 0 auto;width:32px;height:32px;
  background:linear-gradient(140deg,var(--flame),#FF8F4D);
  clip-path:polygon(14% 0,100% 0,86% 100%,0 100%);
  box-shadow:0 0 16px rgba(255,90,31,.5);
}
.brand__mark::after{content:"";position:absolute;inset:7px 6px;background:var(--ink);clip-path:polygon(26% 0,100% 0,74% 100%,0 100%)}
.brand__text{display:flex;flex-direction:column;min-width:0}
.brand__name{font-family:var(--font-head);font-weight:900;font-size:17px;line-height:1.05;letter-spacing:.06em;color:var(--text)}
.brand__sub{font-family:var(--font-data);font-size:9.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.status-chip{
  display:inline-flex;align-items:center;gap:8px;flex:0 0 auto;
  padding:5px 10px;border:1px solid rgba(32,227,210,.28);background:rgba(27,38,51,.55);
  font-family:var(--font-data);font-size:10.5px;letter-spacing:.1em;color:var(--muted);white-space:nowrap;
}
.status-chip__dot{width:7px;height:7px;border-radius:50%;background:var(--live);box-shadow:0 0 0 3px rgba(32,227,210,.16);animation:pulse 2.4s ease-in-out infinite}
.status-chip__text{font-family:var(--font-data);font-size:10.5px;letter-spacing:.1em}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.32}}
.nav-toggle{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;flex:0 0 auto;
  min-height:44px;min-width:44px;padding:8px 12px;
  border:1px solid var(--line);background:rgba(27,38,51,.7);color:var(--muted);
  cursor:pointer;transition:border-color .2s var(--ease),color .2s var(--ease),background-color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--flame);color:var(--flame-soft)}
.nav-toggle__bars{position:relative;display:block;width:16px;height:10px}
.nav-toggle__bars::before,.nav-toggle__bars::after{content:"";position:absolute;left:0;width:16px;height:2px;background:currentColor;transition:transform .25s var(--ease),top .25s var(--ease)}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{top:8px}
.nav-toggle__label{font-family:var(--font-data);font-size:11px;letter-spacing:.16em;text-transform:uppercase}
.site-header[data-open] .nav-toggle{border-color:var(--flame);background:rgba(255,90,31,.12);color:var(--flame-soft)}
.site-header[data-open] .nav-toggle__bars::before{top:4px;transform:rotate(45deg)}
.site-header[data-open] .nav-toggle__bars::after{top:4px;transform:rotate(-45deg)}

/* 09 · navigation */
.site-nav{
  position:fixed;top:var(--bar-h);left:0;right:0;bottom:0;z-index:110;
  display:flex;flex-direction:column;gap:14px;
  padding:16px 16px 28px;overflow-y:auto;
  background:linear-gradient(180deg,rgba(12,16,20,.995),rgba(10,12,15,.995));
  border-top:1px solid rgba(51,65,79,.6);
  visibility:hidden;opacity:0;transform:translateY(-10px);pointer-events:none;
  transition:opacity .26s var(--ease),transform .26s var(--ease),visibility .26s;
}
.site-header[data-open] .site-nav{visibility:visible;opacity:1;transform:none;pointer-events:auto}
.site-nav__list{counter-reset:nav}
.site-nav__item{border-top:1px solid rgba(51,65,79,.45)}
.site-nav__item:last-child{border-bottom:1px solid rgba(51,65,79,.45)}
.site-nav__link{
  position:relative;display:flex;align-items:center;gap:12px;
  min-height:52px;padding:12px 8px;
  font-family:var(--font-head);font-weight:700;font-size:19px;line-height:1.15;letter-spacing:.04em;color:var(--text);
  transition:color .2s var(--ease),background-color .2s var(--ease),padding-left .2s var(--ease);
}
.site-nav__link::before{
  counter-increment:nav;content:counter(nav,decimal-leading-zero);flex:0 0 auto;
  font-family:var(--font-data);font-size:10.5px;font-weight:400;letter-spacing:.1em;color:var(--muted);
  transition:color .2s var(--ease);
}
.site-nav__link:hover,.site-nav__link:focus-visible{color:var(--flame-soft);background:linear-gradient(90deg,rgba(255,90,31,.13),transparent 72%);padding-left:14px}
.site-nav__link[aria-current="page"]{color:var(--flame-soft);background:linear-gradient(90deg,rgba(255,90,31,.16),transparent 72%)}
.site-nav__link[aria-current="page"]::before{color:var(--live)}
.site-nav__link[aria-current="page"]::after{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:3px;height:20px;background:var(--flame)}
.site-nav__foot{margin-top:auto;display:flex;flex-direction:column;gap:6px;padding-top:16px;border-top:1px solid rgba(51,65,79,.6)}
.site-nav__kicker{font-family:var(--font-data);font-size:10.5px;letter-spacing:.2em;text-transform:uppercase;color:var(--flame)}
.site-nav__hint{font-size:13px;line-height:1.6;color:var(--muted)}
.site-nav__foot .btn{width:100%;margin-top:8px}

/* 10 · scroll meter */
.scroll-meter{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:rgba(51,65,79,.5);pointer-events:none}
.scroll-meter__fill{display:block;width:100%;height:100%;background:linear-gradient(90deg,var(--flame),var(--flame-soft));transform-origin:left center;transform:scaleX(var(--progress,0))}

/* 11 · footer */
.site-footer{position:relative;margin-top:72px;padding-bottom:24px;background:linear-gradient(180deg,#101519,#0A0C0F 72%);border-top:1px solid var(--line);color:var(--text)}
.site-footer::before{content:"";position:absolute;top:-1px;left:0;width:min(280px,45%);height:3px;background:linear-gradient(90deg,var(--flame),transparent)}
.site-footer__inner{width:min(1140px,calc(100% - 40px));margin-inline:auto;display:grid;gap:32px;padding:44px 0 32px}
.site-footer__lede{display:flex;flex-direction:column;align-items:flex-start;gap:12px;max-width:420px}
.site-footer__eyebrow{font-family:var(--font-data);font-size:10.5px;letter-spacing:.22em;text-transform:uppercase;color:var(--flame)}
.site-footer__title{font-family:var(--font-head);font-weight:900;font-size:clamp(1.5rem,3vw,2rem);line-height:1.1;letter-spacing:.01em}
.site-footer__note{font-size:13.5px;line-height:1.65;color:var(--muted)}
.site-footer__cols{display:grid;gap:26px 20px;grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}
.footer-col{display:flex;flex-direction:column;gap:10px;min-width:0}
.footer-col__heading{font-family:var(--font-data);font-size:10.5px;font-weight:400;letter-spacing:.2em;text-transform:uppercase;color:var(--muted);padding-bottom:8px;border-bottom:1px solid rgba(51,65,79,.55)}
.footer-col__list{display:flex;flex-direction:column;gap:2px}
.footer-col__link{display:inline-flex;align-items:center;min-height:36px;font-size:14px;color:var(--text);transition:color .2s var(--ease)}
.footer-col__link::before{content:"";display:inline-block;width:0;height:1px;background:var(--flame);transition:width .2s var(--ease),margin-right .2s var(--ease)}
.footer-col__link:hover{color:var(--flame-soft)}
.footer-col__link:hover::before{width:12px;margin-right:8px}
.footer-col--contact .footer-contact{display:flex;flex-direction:column;gap:10px;font-style:normal}
.footer-contact__row{display:flex;flex-direction:column;gap:2px}
.footer-contact__label{font-family:var(--font-data);font-size:9.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--muted)}
.footer-contact__value{font-size:13.5px;line-height:1.55;color:var(--text);word-break:break-word}
.footer-contact__value--mono{font-family:var(--font-data);font-size:13px;letter-spacing:.02em}
.footer-contact__note{font-size:12px;line-height:1.6;color:var(--muted);padding-top:4px}
.site-footer__base{width:min(1140px,calc(100% - 40px));margin-inline:auto;display:flex;flex-wrap:wrap;align-items:center;gap:10px 20px;padding-top:18px;border-top:1px solid rgba(51,65,79,.5);font-size:12px;color:var(--muted)}
.site-footer__icp{font-family:var(--font-data);font-size:11.5px;letter-spacing:.06em;color:var(--muted)}
.site-footer__copy{font-size:11.5px;letter-spacing:.04em}
.legal-links{display:flex;flex-wrap:wrap;gap:6px 16px;margin-left:auto}
.legal-links__item{display:flex}
.legal-links__link{font-size:12px;color:var(--muted);border-bottom:1px solid transparent;transition:color .2s var(--ease),border-color .2s var(--ease)}
.legal-links__link:hover{color:var(--flame-soft);border-color:rgba(255,90,31,.5)}

/* 12 · breadcrumbs & prose */
.breadcrumbs{padding:18px 0 0}
.breadcrumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-data);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.breadcrumbs li{display:flex;align-items:center;gap:8px}
.breadcrumbs li+li::before{content:"/";color:var(--line)}
.breadcrumbs a{color:var(--muted);transition:color .2s var(--ease)}
.breadcrumbs a:hover{color:var(--flame-soft)}
.breadcrumbs [aria-current="page"]{color:var(--text)}
.prose{max-width:70ch;font-size:15.5px;line-height:1.75;color:var(--text)}
.prose>*+*{margin-top:1.1em}
.prose h2{margin-top:1.9em;font-size:clamp(1.5rem,3vw,2rem)}
.prose h3{margin-top:1.6em}
.prose ul,.prose ol{padding-left:1.3em;list-style:revert}
.prose li+li{margin-top:.4em}
.prose a{color:var(--flame-soft);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
.prose blockquote{border-left:3px solid var(--flame);padding:6px 0 6px 16px;color:var(--muted);font-family:var(--font-serif);font-style:italic}
.prose code{font-family:var(--font-data);font-size:.9em;background:var(--data);padding:2px 6px;border-radius:2px}
.prose hr{border:0;height:1px;background:var(--line);margin:2em 0}

/* 13 · image frames */
.img-frame{position:relative;overflow:hidden;border:1px solid var(--line);background:linear-gradient(135deg,var(--data),#0D1319 58%,var(--ember));aspect-ratio:16/10}
.img-frame::after{content:"";position:absolute;inset:0;pointer-events:none;background:linear-gradient(180deg,rgba(10,12,15,0) 42%,rgba(10,12,15,.78))}
.img-frame img{width:100%;height:100%;object-fit:cover;filter:saturate(.88) contrast(1.04)}
.img-frame--wide{aspect-ratio:21/9}
.img-frame--tall{aspect-ratio:3/4}
.img-frame--square{aspect-ratio:1/1}
.img-frame__caption{position:absolute;left:0;right:0;bottom:0;z-index:1;padding:10px 14px;font-family:var(--font-data);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--text)}

/* 14 · reveal */
.has-js [data-reveal]{opacity:0;transform:translateY(16px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
.has-js [data-reveal].is-visible{opacity:1;transform:none}

/* 15 · tablet adjustments */
@media (max-width:599px){
  .status-chip{padding:6px 7px}
  .status-chip__text{display:none}
  .nav-toggle__label{display:none}
}
@media (min-width:600px){
  .site-header__bar{padding:10px 22px}
  .brand__sub{font-size:10px}
}
@media (min-width:860px){
  .site-footer__inner{grid-template-columns:minmax(240px,1fr) minmax(0,1.6fr);gap:20px 48px;padding:56px 0 40px}
  .site-footer__lede{max-width:340px}
  .site-footer__cols{grid-template-columns:repeat(3,minmax(0,1fr))}
  .legal-links{margin-left:auto}
}

/* 16 · desktop rail */
@media (min-width:1024px){
  body{padding-top:0;padding-left:var(--rail-w)}
  #main-content{scroll-margin-top:14px}
  .site-header{
    top:0;right:auto;bottom:0;left:0;width:var(--rail-w);
    display:flex;flex-direction:column;overflow:hidden;
    border-bottom:0;border-right:1px solid var(--line);
    background:linear-gradient(180deg,#0E1217 0%,#0A0C0F 52%,#0D1218 100%);
  }
  .site-header::before{
    content:"";position:absolute;left:-30%;bottom:-140px;width:180%;height:320px;pointer-events:none;
    background:radial-gradient(circle at 40% 62%,rgba(255,90,31,.30),rgba(58,19,12,.20) 46%,transparent 72%);
    transform:rotate(-10deg);
  }
  .site-header::after{
    content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;
    background:repeating-linear-gradient(115deg,rgba(255,255,255,.022) 0 1px,transparent 1px 9px);
  }
  .site-header__bar{flex-direction:column;align-items:stretch;gap:14px;min-height:0;padding:24px 22px 16px}
  .brand{flex:0 0 auto}
  .brand__name{font-size:22px}
  .brand__sub{font-size:10px}
  .status-chip{align-self:flex-start;font-size:10.5px;padding:5px 9px}
  .status-chip__text{display:inline}
  .nav-toggle{display:none}
  .site-nav{
    position:static;z-index:1;flex:1 1 auto;gap:0;
    padding:6px 14px 0;overflow-y:auto;overscroll-behavior:contain;
    background:transparent;border-top:0;visibility:visible;opacity:1;transform:none;pointer-events:auto;
    transition:none;
  }
  .site-nav__link{min-height:46px;padding:10px 6px;font-size:17px}
  .site-nav__foot{margin-top:auto;padding:16px 6px 22px;gap:6px}
  .site-nav__foot .btn{width:100%}
  .site-nav__kicker{font-size:10px}
  .site-nav__hint{font-size:12.5px}
  .scroll-meter{left:auto;top:0;right:0;bottom:0;width:2px;height:auto;background:rgba(51,65,79,.35)}
  .scroll-meter__fill{transform-origin:top center;transform:scaleY(var(--progress,0));background:linear-gradient(180deg,var(--flame),var(--flame-soft))}
}

/* 17 · reduced motion */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  .status-chip__dot{animation:none}
  .has-js [data-reveal]{opacity:1;transform:none;transition:none}
}