:root{
  --ink-900:#071426;
  --ink-800:#0C1E35;
  --ink-700:#17324F;
  --paper-0:#F4F7FB;
  --paper-1:#DCE4EE;
  --signal:#FF6A2A;
  --cyan:#35F0D0;
  --alert:#FF4D5E;
  --ok:#2BD97C;
  --muted:#8FA3BA;
  --font-title:'Barlow Condensed','Oswald','Noto Sans SC','Source Han Sans SC','PingFang SC',sans-serif;
  --font-body:'Noto Sans SC','Source Han Sans SC','PingFang SC','Microsoft YaHei',sans-serif;
  --font-num:'JetBrains Mono','IBM Plex Mono','Roboto Mono',ui-monospace,monospace;
  --max-w:1320px;
  --pad-x:clamp(16px,4vw,48px);
  --dur:180ms;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:120px}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video,picture{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
:focus-visible{outline:2px solid var(--signal);outline-offset:3px}

body{
  min-height:100vh;
  background:var(--ink-900);
  color:var(--paper-0);
  font-family:var(--font-body);
  font-size:clamp(16px,1.05vw,17px);
  line-height:1.72;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
::selection{background:var(--signal);color:var(--ink-900)}

h1,h2,h3,h4{
  font-family:var(--font-title);
  font-weight:700;
  line-height:1.08;
  letter-spacing:-0.01em;
  color:var(--paper-0);
}
h1{font-size:clamp(2.4rem,6vw,5.6rem)}
h2{font-size:clamp(1.6rem,3vw,2.6rem)}
h3{font-size:clamp(1.15rem,1.6vw,1.4rem);font-weight:600;line-height:1.25}
p{max-width:72ch}
strong{font-weight:600;color:var(--paper-0)}

.skip-link{
  position:fixed;
  top:12px;
  left:12px;
  z-index:80;
  padding:12px 20px;
  background:var(--cyan);
  color:var(--ink-900);
  border:1px solid var(--ink-900);
  border-radius:2px;
  font-family:var(--font-num);
  font-size:13px;
  letter-spacing:.04em;
  transform:translateY(-200%);
  transition:transform var(--dur) ease;
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0)}

/* ---------- layout utilities ---------- */
.container{
  width:100%;
  max-width:var(--max-w);
  margin-inline:auto;
  padding-inline:var(--pad-x);
}
.section{padding-block:clamp(48px,7vw,96px)}
.layout-grid{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(16px,2vw,28px);
}
.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}
.span-9{grid-column:span 9}
.span-12{grid-column:span 12}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:44px;
  padding:11px 20px;
  border:1px solid transparent;
  border-radius:2px;
  font-family:var(--font-body);
  font-size:13px;
  font-weight:600;
  letter-spacing:.05em;
  line-height:1.2;
  text-align:center;
  transition:background var(--dur) ease,color var(--dur) ease,border-color var(--dur) ease;
}
.btn--signal{background:var(--signal);color:var(--ink-900);border-color:var(--signal)}
.btn--signal:hover{background:var(--cyan);border-color:var(--cyan);color:var(--ink-900)}
.btn--signal:focus-visible{outline-color:var(--cyan)}
.btn--ghost{background:transparent;color:var(--paper-0);border-color:var(--ink-700)}
.btn--ghost:hover{background:var(--ink-700);border-color:var(--cyan);color:var(--paper-0)}
.btn--sm{min-height:38px;padding:8px 14px;font-size:12px;letter-spacing:.06em}
.btn--block{width:100%}

/* ---------- status tags ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  border:1px solid currentColor;
  border-radius:2px;
  font-family:var(--font-num);
  font-size:11px;
  letter-spacing:.08em;
  line-height:1.6;
  white-space:nowrap;
}
.tag--cyan{color:var(--cyan)}
.tag--signal{color:var(--signal)}
.tag--alert{color:var(--alert)}
.tag--ok{color:var(--ok)}
.tag--solid{background:var(--cyan);border-color:var(--cyan);color:var(--ink-900)}

/* ---------- breadcrumbs ---------- */
.breadcrumbs{
  padding-block:16px;
  font-family:var(--font-num);
  font-size:11px;
  letter-spacing:.06em;
  color:var(--muted);
}
.breadcrumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumbs li{display:inline-flex;align-items:center;gap:8px;min-height:24px}
.breadcrumbs li + li::before{content:"/";color:var(--ink-700)}
.breadcrumbs a{color:var(--paper-1);transition:color var(--dur) ease}
.breadcrumbs a:hover{color:var(--signal)}
.breadcrumbs [aria-current="page"]{color:var(--muted)}

/* ---------- media frames ---------- */
.media-frame{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  background:var(--ink-800);
  border:1px solid var(--ink-700);
  border-radius:2px;
}
.media-frame::after{
  content:"";
  position:absolute;
  top:0;
  right:0;
  width:28px;
  height:28px;
  border-left:1px solid var(--cyan);
  border-bottom:1px solid var(--cyan);
  opacity:.65;
  pointer-events:none;
}
.media-frame img,
.media-frame picture,
.media-frame video{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame--16x9{aspect-ratio:16 / 9}
.media-frame--4x3{aspect-ratio:4 / 3}
.media-frame--1x1{aspect-ratio:1 / 1}
.media-frame--21x9{aspect-ratio:21 / 9}
.media-frame__label{
  position:absolute;
  left:0;
  bottom:0;
  padding:6px 10px;
  background:var(--ink-900);
  font-family:var(--font-num);
  font-size:10.5px;
  letter-spacing:.1em;
  color:var(--cyan);
}

/* ---------- header ---------- */
.scroll-progress{
  position:fixed;
  top:0;
  left:0;
  width:100%;
  height:2px;
  background:var(--signal);
  transform:scaleX(0);
  transform-origin:0 50%;
  z-index:50;
  pointer-events:none;
}
.site-header{
  position:fixed;
  top:20px;
  left:0;
  right:0;
  z-index:40;
  display:flex;
  justify-content:center;
  padding-inline:var(--pad-x);
  pointer-events:none;
}
.nav-capsule{
  pointer-events:auto;
  position:relative;
  display:flex;
  align-items:center;
  gap:clamp(10px,1.6vw,24px);
  width:100%;
  max-width:var(--max-w);
  min-height:66px;
  padding:9px 10px 9px 16px;
  background:var(--ink-800);
  border:1px solid var(--ink-700);
  border-radius:999px;
  box-shadow:0 22px 44px -30px #000;
  transition:min-height var(--dur) ease,padding var(--dur) ease,background var(--dur) ease,border-color var(--dur) ease;
}
.site-header[data-scrolled="true"] .nav-capsule{
  min-height:54px;
  padding:4px 8px 4px 12px;
  background:#0A1929;
}
.brand{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
  min-height:44px;
  border-radius:2px;
}
.brand__mark{
  display:grid;
  place-items:center;
  width:34px;
  height:34px;
  background:var(--signal);
  color:var(--ink-900);
  border-radius:2px;
  font-family:var(--font-num);
  font-size:13px;
  font-weight:700;
  letter-spacing:.02em;
  transition:background var(--dur) ease,color var(--dur) ease;
}
.brand:hover .brand__mark{background:var(--cyan)}
.brand__text{display:flex;flex-direction:column;line-height:1.15}
.brand__label{
  font-family:var(--font-title);
  font-weight:700;
  font-size:15px;
  letter-spacing:.03em;
  color:var(--paper-0);
  white-space:nowrap;
}
.brand__desc{
  font-size:10px;
  letter-spacing:.16em;
  color:var(--muted);
  white-space:nowrap;
}
.meter{
  display:flex;
  align-items:stretch;
  flex:0 0 auto;
  border:1px solid var(--ink-700);
  border-radius:2px;
  overflow:hidden;
}
.meter__cell{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 10px;
  font-family:var(--font-num);
  font-size:11px;
  letter-spacing:.08em;
  white-space:nowrap;
  color:var(--muted);
}
.meter__cell + .meter__cell{border-left:1px solid var(--ink-700)}
.meter__cell--version{color:var(--signal);font-weight:700}
.meter__cell--round{color:var(--paper-1)}
.meter__dot{
  width:6px;
  height:6px;
  background:var(--cyan);
  border-radius:1px;
  animation:meter-pulse 2.4s ease-in-out infinite;
}
@keyframes meter-pulse{0%,100%{opacity:1}50%{opacity:.35}}
.primary-nav{margin-left:auto}
.primary-nav__list{display:flex;align-items:center;gap:clamp(4px,1vw,16px)}
.primary-nav__link{
  position:relative;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 4px;
  font-size:13.5px;
  letter-spacing:.01em;
  color:var(--paper-1);
  white-space:nowrap;
  transition:color var(--dur) ease;
}
.primary-nav__link::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:8px;
  height:2px;
  background:var(--signal);
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform var(--dur) ease;
}
.primary-nav__link:hover{color:var(--paper-0)}
.primary-nav__link:hover::after{transform:scaleX(1)}
.primary-nav__link[aria-current="page"]{color:var(--signal)}
.primary-nav__link[aria-current="page"]::after{transform:scaleX(1)}
.header-actions{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  min-width:44px;
  min-height:44px;
  padding:0 12px;
  border:1px solid var(--ink-700);
  border-radius:2px;
  color:var(--paper-0);
  transition:border-color var(--dur) ease,color var(--dur) ease;
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__icon{position:relative;display:block;width:16px;height:12px}
.nav-toggle__icon span{
  position:absolute;
  left:0;
  width:100%;
  height:2px;
  background:currentColor;
  transition:transform var(--dur) ease,opacity 120ms ease;
}
.nav-toggle__icon span:nth-child(1){top:0}
.nav-toggle__icon span:nth-child(2){top:5px}
.nav-toggle__icon span:nth-child(3){top:10px}
.nav-toggle__text{font-family:var(--font-num);font-size:11px;letter-spacing:.1em}
.site-header[data-open="true"] .nav-toggle__icon span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.site-header[data-open="true"] .nav-toggle__icon span:nth-child(2){opacity:0}
.site-header[data-open="true"] .nav-toggle__icon span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}
.site-header[data-open="true"] .nav-toggle{border-color:var(--signal);color:var(--signal)}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(64px,10vw,140px);
  background:var(--ink-900);
  border-top:1px solid var(--ink-700);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-2px;
  left:var(--pad-x);
  width:88px;
  height:3px;
  background:var(--signal);
}
.footer-main{
  max-width:var(--max-w);
  margin-inline:auto;
  padding:clamp(48px,6vw,80px) var(--pad-x) clamp(32px,4vw,56px);
}
.footer-grid{
  display:grid;
  grid-template-columns:minmax(0,1.7fr) repeat(3,minmax(0,.75fr)) minmax(0,1.3fr);
  gap:clamp(24px,3vw,48px);
}
.footer-brand{min-width:0}
.footer-brand__line{
  font-family:var(--font-title);
  font-weight:700;
  font-size:clamp(1.15rem,1.7vw,1.5rem);
  line-height:1.25;
  letter-spacing:-0.01em;
  color:var(--paper-0);
  max-width:22ch;
}
.footer-brand__stamp{
  display:inline-block;
  margin-top:16px;
  padding:6px 10px;
  border:1px solid var(--ink-700);
  border-radius:2px;
  font-family:var(--font-num);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--cyan);
}
.footer-brand__note{
  margin-top:16px;
  max-width:40ch;
  font-size:13px;
  line-height:1.7;
  color:var(--muted);
}
.footer-col{min-width:0}
.footer-col__title{
  display:flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-num);
  font-size:11px;
  font-weight:500;
  letter-spacing:.18em;
  line-height:1.4;
  color:var(--muted);
}
.footer-col__title::before{
  content:"";
  width:6px;
  height:6px;
  background:var(--signal);
  flex:0 0 auto;
}
.footer-col:nth-of-type(2) .footer-col__title::before{background:var(--cyan)}
.footer-col__list{margin-top:14px;display:grid;gap:2px}
.footer-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  min-height:34px;
  font-size:14px;
  color:var(--paper-1);
  transition:color var(--dur) ease,padding-left var(--dur) ease;
}
.footer-link::before{
  content:"";
  position:absolute;
  left:0;
  top:50%;
  width:0;
  height:1px;
  background:var(--signal);
  transform:translateY(-50%);
  transition:width var(--dur) ease;
}
.footer-link:hover{color:var(--paper-0);padding-left:14px}
.footer-link:hover::before{width:10px}
.footer-link[aria-current="page"]{color:var(--signal)}
.footer-link[aria-current="page"]::before{width:10px}
.footer-contact{display:grid;gap:14px;margin-top:14px}
.footer-contact__row{
  display:grid;
  gap:4px;
  padding-bottom:12px;
  border-bottom:1px solid var(--ink-700);
}
.footer-contact__label{
  font-family:var(--font-num);
  font-size:10px;
  letter-spacing:.16em;
  color:var(--muted);
}
.footer-contact__value{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:10px;
  font-family:var(--font-num);
  font-size:12.5px;
  line-height:1.55;
  color:var(--paper-0);
  word-break:break-word;
}
.footer-contact__note{
  font-size:12px;
  line-height:1.7;
  color:var(--muted);
  max-width:34ch;
}
.copy-btn{
  min-height:28px;
  padding:4px 9px;
  border:1px solid var(--ink-700);
  border-radius:2px;
  font-family:var(--font-num);
  font-size:10px;
  letter-spacing:.1em;
  color:var(--muted);
  transition:color var(--dur) ease,border-color var(--dur) ease,background var(--dur) ease;
}
.copy-btn:hover{color:var(--cyan);border-color:var(--cyan)}
.copy-btn[data-copied="true"]{background:var(--ok);border-color:var(--ok);color:var(--ink-900)}
.copy-status{
  display:block;
  min-height:16px;
  font-family:var(--font-num);
  font-size:11px;
  letter-spacing:.04em;
  color:var(--cyan);
}
.footer-base{
  max-width:var(--max-w);
  margin-inline:auto;
  padding:18px var(--pad-x) 28px;
  border-top:1px solid var(--ink-700);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 24px;
  font-family:var(--font-num);
  font-size:11.5px;
  letter-spacing:.04em;
  color:var(--muted);
}
.footer-base__item{min-width:0}
.footer-base__item--push{margin-left:auto;color:var(--paper-1)}

/* ---------- responsive ---------- */
@media (max-width:1180px){
  .meter{display:none}
  .primary-nav__list{gap:6px}
  .primary-nav__link{font-size:13px}
  .footer-grid{grid-template-columns:minmax(0,1.5fr) repeat(3,minmax(0,1fr))}
  .footer-col:last-child{grid-column:1 / -1}
  .footer-contact{grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
  .footer-contact__note,
  .copy-status{grid-column:1 / -1}
}
@media (max-width:1080px){
  .brand__desc{display:none}
}
@media (max-width:960px){
  html{scroll-padding-top:24px}
  body{padding-bottom:104px}
  .site-header{top:auto;bottom:12px;padding-inline:12px}
  .nav-capsule{
    min-height:58px;
    padding:7px 8px 7px 12px;
    gap:8px;
    border-radius:999px;
  }
  .site-header[data-scrolled="true"] .nav-capsule{min-height:54px;padding:4px 8px 4px 12px}
  .nav-toggle{display:inline-flex}
  .header-actions{gap:6px}
  .primary-nav{
    position:absolute;
    left:0;
    right:0;
    bottom:calc(100% + 10px);
    margin-left:0;
    padding:10px;
    background:var(--ink-800);
    border:1px solid var(--ink-700);
    border-radius:2px;
    box-shadow:0 26px 50px -34px #000;
    max-height:min(70vh,540px);
    overflow:auto;
    opacity:0;
    visibility:hidden;
    transform:translateY(10px);
    transition:opacity var(--dur) ease,transform var(--dur) ease,visibility var(--dur) ease;
  }
  .site-header[data-open="true"] .primary-nav{
    opacity:1;
    visibility:visible;
    transform:translateY(0);
  }
  .primary-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .primary-nav__link{
    min-height:48px;
    padding:0 12px;
    font-size:15px;
    border-bottom:1px solid var(--ink-700);
  }
  .primary-nav__list li:last-child .primary-nav__link{border-bottom:0}
  .primary-nav__link::after{display:none}
  .primary-nav__link[aria-current="page"]{
    background:rgba(255,106,42,.09);
    box-shadow:inset 3px 0 0 var(--signal);
  }
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
  .footer-contact{grid-template-columns:1fr}
  .layout-grid{grid-template-columns:1fr}
  .span-4,.span-5,.span-6,.span-7,.span-8,.span-9,.span-12{grid-column:1 / -1}
}
@media (max-width:720px){
  .brand__label{font-size:13.5px}
  .brand__mark{width:30px;height:30px;font-size:12px}
  .nav-toggle__text{display:none}
  .footer-grid{grid-template-columns:1fr}
  .footer-base{flex-direction:column;align-items:flex-start;gap:8px}
  .footer-base__item--push{margin-left:0}
}
@media (max-width:400px){
  .header-actions .btn--signal{font-size:11px;padding:8px 10px;min-height:36px}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
}