:root{
  --ink:#071A15;
  --ink-2:#0C2A22;
  --ink-3:#174A3C;
  --cyan:#49F2C2;
  --orange:#FF7A1A;
  --paper:#F1EEDF;
  --fog:#D7E9E1;
  --teal:#0B7F69;
  --line:#6F8B80;

  --rail-w:232px;
  --topbar-h:64px;
  --gutter:clamp(18px,4vw,60px);
  --measure:66ch;
  --radius:18px;
  --radius-sm:10px;

  --font-serif:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",serif;
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono","Consolas",ui-monospace,SFMono-Regular,Menlo,monospace;

  --ease:cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--topbar-h) + 16px);
}
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,video,canvas{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0}
a{color:var(--cyan);text-decoration:none}
::selection{background:var(--cyan);color:var(--ink)}

/* ===== 02. Base typography ===== */
body{
  margin:0;
  min-height:100vh;
  background-color:var(--ink);
  color:var(--fog);
  font-family:var(--font-sans);
  font-size:1rem;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3{
  font-family:var(--font-serif);
  font-weight:600;
  line-height:1.15;
  letter-spacing:.01em;
  color:var(--paper);
}
h1{font-size:clamp(2.25rem,5.5vw,4.5rem)}
h2{font-size:clamp(1.5rem,3vw,2.25rem)}
h3{font-size:clamp(1.125rem,2vw,1.375rem);line-height:1.35}
p{max-width:var(--measure)}
strong{color:var(--paper);font-weight:600}
main{display:block}
#main-content:focus{outline:none}

:where(a,button,summary,[tabindex]):focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
  border-radius:6px;
}

.sr-only{
  position:absolute;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  white-space:nowrap;
  border:0;
}

/* ===== 03. Skip link ===== */
.skip-link{
  position:fixed;
  top:10px;left:10px;
  z-index:200;
  padding:.62rem 1.05rem;
  border-radius:999px;
  background-color:var(--cyan);
  color:var(--ink);
  font-size:.8125rem;
  font-weight:600;
  letter-spacing:.08em;
  transform:translateY(-180%);
  transition:transform .18s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0);outline:3px solid var(--orange);outline-offset:3px}

/* ===== 04. Header shell ===== */
.site-header{
  position:sticky;
  top:0;
  z-index:100;
  background-color:var(--ink-2);
  color:var(--fog);
  border-bottom:1px solid var(--ink-3);
}
.rail{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  min-height:var(--topbar-h);
  padding:0 16px;
}
.rail__brand{
  position:relative;
  z-index:120;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  min-width:0;
}

/* brand */
.brand{
  display:flex;
  align-items:center;
  gap:10px;
  color:var(--paper);
  text-decoration:none;
  min-width:0;
}
.brand__mark{
  position:relative;
  flex:0 0 auto;
  width:28px;height:28px;
  border:1px solid var(--cyan);
  border-radius:50%;
  display:grid;
  place-items:center;
}
.brand__mark::after{
  content:"";
  width:8px;height:8px;
  border-radius:50%;
  background-color:var(--cyan);
  box-shadow:0 0 0 4px rgba(73,242,194,.14);
}
.brand__text{display:flex;flex-direction:column;line-height:1.2;min-width:0}
.brand__name{
  font-family:var(--font-serif);
  font-size:1.0625rem;
  font-weight:600;
  letter-spacing:.06em;
  color:var(--paper);
  white-space:nowrap;
}
.brand__tag{
  font-family:var(--font-mono);
  font-size:.625rem;
  letter-spacing:.16em;
  color:var(--line);
  white-space:nowrap;
}

/* mobile toggle */
.nav-toggle{
  display:inline-flex;
  align-items:center;
  gap:8px;
  flex:0 0 auto;
  min-height:44px;
  padding:0 14px;
  border:1px solid var(--ink-3);
  border-radius:999px;
  color:var(--fog);
  font-size:.8125rem;
  letter-spacing:.14em;
  cursor:pointer;
  transition:border-color .18s var(--ease),color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__bars{display:grid;gap:4px;width:16px}
.nav-toggle__bars span{
  display:block;
  height:2px;
  border-radius:2px;
  background-color:var(--cyan);
  transition:transform .18s var(--ease);
}
.site-header[data-open] .nav-toggle__bars span:first-child{transform:translateY(3px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars span:last-child{transform:translateY(-3px) rotate(-45deg)}

/* nav: drawer on mobile */
.site-nav{
  position:fixed;
  top:var(--topbar-h);
  bottom:0;
  left:0;
  z-index:110;
  width:min(86vw,320px);
  display:flex;
  flex-direction:column;
  gap:16px;
  padding:22px 20px 26px;
  background-color:var(--ink-2);
  border-right:1px solid var(--ink-3);
  overflow-y:auto;
  transform:translateX(-102%);
  visibility:hidden;
  transition:transform .22s var(--ease),visibility .22s var(--ease);
}
.site-header[data-open] .site-nav{transform:none;visibility:visible}
.site-nav__label{
  font-family:var(--font-mono);
  font-size:.625rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--line);
  padding-bottom:10px;
  border-bottom:1px solid var(--ink-3);
  max-width:none;
}
.site-nav__list{display:flex;flex-direction:column;gap:2px}
.site-nav__link{
  display:flex;
  align-items:baseline;
  gap:12px;
  padding:11px 12px;
  border-left:2px solid transparent;
  border-radius:var(--radius-sm);
  color:var(--fog);
  font-size:.9375rem;
  letter-spacing:.02em;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.site-nav__link:hover{background-color:rgba(73,242,194,.07);color:var(--paper)}
.site-nav__link[aria-current="page"]{
  color:var(--cyan);
  border-left-color:var(--cyan);
  background-color:rgba(73,242,194,.09);
}
.site-nav__num{
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.08em;
  color:var(--line);
  font-variant-numeric:tabular-nums;
}
.site-nav__link[aria-current="page"] .site-nav__num{color:var(--cyan)}
.site-nav__text{min-width:0}

/* status + CTA block */
.nav-foot{
  margin-top:auto;
  display:flex;
  flex-direction:column;
  gap:14px;
  padding-top:18px;
  border-top:1px solid var(--ink-3);
}
.nav-foot__status{
  display:flex;
  align-items:flex-start;
  gap:9px;
  font-size:.75rem;
  line-height:1.6;
  letter-spacing:.03em;
  color:var(--line);
  max-width:none;
}
.dot{
  flex:0 0 auto;
  width:7px;height:7px;
  margin-top:.55em;
  border-radius:50%;
  background-color:var(--cyan);
  box-shadow:0 0 0 3px rgba(73,242,194,.14);
}
.dot--pulse{animation:dotPulse 2.6s var(--ease) infinite}
@keyframes dotPulse{
  0%,100%{box-shadow:0 0 0 3px rgba(73,242,194,.14)}
  50%{box-shadow:0 0 0 8px rgba(73,242,194,.04)}
}
.nav-foot .btn{width:100%}

/* scrim */
.nav-scrim{
  position:fixed;
  top:var(--topbar-h);
  right:0;bottom:0;left:0;
  z-index:105;
  background-color:rgba(7,26,21,.74);
  opacity:0;
  pointer-events:none;
  transition:opacity .2s var(--ease);
}
.site-header[data-open] .nav-scrim{opacity:1;pointer-events:auto}

/* scroll progress */
.scroll-progress{
  position:fixed;
  top:0;left:0;right:0;
  height:2px;
  z-index:130;
  pointer-events:none;
  background-color:var(--cyan);
  opacity:.9;
  transform:scaleX(var(--progress,0));
  transform-origin:0 50%;
}

body.is-locked{overflow:hidden}

/* ===== 05. Buttons ===== */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5em;
  min-height:44px;
  padding:.72rem 1.2rem;
  border:1px solid transparent;
  border-radius:999px;
  font-family:var(--font-sans);
  font-size:.9375rem;
  font-weight:600;
  letter-spacing:.04em;
  text-align:center;
  cursor:pointer;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease);
}
.btn:active{transform:translateY(1px)}
.btn--signal{background-color:var(--orange);color:var(--ink)}
.btn--signal:hover{background-color:#FF9440}
.btn--cyan{background-color:var(--cyan);color:var(--ink)}
.btn--cyan:hover{background-color:#7FF7D6}
.btn--ghost{background-color:transparent;border-color:var(--ink-3);color:var(--fog)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.btn--paper{background-color:var(--ink);color:var(--paper)}
.btn--paper:hover{background-color:var(--ink-3)}

/* ===== 06. Layout & generic components ===== */
.wrap{
  width:100%;
  max-width:1120px;
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.prose{max-width:var(--measure)}
.prose p{max-width:none;margin-bottom:1.1em}
.prose p:last-child{margin-bottom:0}
.prose a{border-bottom:1px solid rgba(73,242,194,.45)}
.prose a:hover{border-bottom-color:var(--cyan)}
.prose h2,.prose h3{margin:1.6em 0 .6em}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan);
}
.eyebrow::before{
  content:"";
  width:22px;height:2px;
  background-color:var(--orange);
}

.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--line);
}
.crumbs li{display:inline-flex;align-items:center;gap:8px}
.crumbs li+li::before{content:"/";color:var(--ink-3)}
.crumbs a{color:var(--fog);border-bottom:1px solid transparent}
.crumbs a:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.crumbs [aria-current="page"]{color:var(--cyan)}

.grid{display:grid;gap:clamp(16px,2.6vw,28px);grid-template-columns:1fr}
.grid--cols{grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr))}
@media (min-width:900px){
  .grid--split{grid-template-columns:7fr 3fr}
}

.card{
  background-color:var(--ink-2);
  border:1px solid var(--ink-3);
  border-radius:var(--radius);
  padding:clamp(18px,2.6vw,26px);
}

.media{
  position:relative;
  overflow:hidden;
  border:1px solid var(--ink-3);
  border-radius:var(--radius);
  aspect-ratio:16/10;
  background-color:var(--ink-3);
  background-image:
    repeating-linear-gradient(0deg,rgba(73,242,194,.08) 0 1px,transparent 1px 44px),
    repeating-linear-gradient(90deg,rgba(73,242,194,.08) 0 1px,transparent 1px 44px);
}
.media img{width:100%;height:100%;object-fit:cover}
.media--wide{aspect-ratio:21/9}
.media--tall{aspect-ratio:4/5}
.media--square{aspect-ratio:1/1}
.media__cap{
  position:absolute;
  right:0;bottom:0;left:0;
  padding:9px 13px;
  background-color:rgba(7,26,21,.78);
  color:var(--fog);
  font-size:.75rem;
  letter-spacing:.06em;
}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid var(--ink-3);
  border-radius:999px;
  background-color:rgba(73,242,194,.08);
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.14em;
  text-transform:uppercase;
}
.tag--signal{
  border-color:rgba(255,122,26,.42);
  background-color:rgba(255,122,26,.12);
  color:var(--orange);
}

.stat{display:flex;flex-direction:column;gap:4px}
.stat__num{
  font-family:var(--font-mono);
  font-weight:600;
  font-variant-numeric:tabular-nums;
  font-size:clamp(1.5rem,3vw,2.25rem);
  line-height:1.1;
  color:var(--paper);
}
.stat__key{font-size:.75rem;letter-spacing:.12em;color:var(--line)}

.divider{
  height:1px;
  border:0;
  margin:clamp(26px,4vw,44px) 0;
  background-color:var(--ink-3);
}

/* ===== 07. Footer ===== */
.site-footer{
  margin-top:clamp(48px,8vw,96px);
  background-color:var(--paper);
  color:var(--ink);
  font-size:.9375rem;
}
.footer__stripe{
  height:6px;
  background-color:var(--ink-2);
  background-image:repeating-linear-gradient(90deg,var(--cyan) 0 2px,transparent 2px 64px);
}
.footer__inner{
  max-width:1120px;
  margin-inline:auto;
  padding:clamp(26px,4vw,42px) var(--gutter) clamp(18px,3vw,26px);
}
.footer__brand{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:4px 18px;
  padding-bottom:clamp(16px,3vw,24px);
  margin-bottom:clamp(20px,3vw,28px);
  border-bottom:1px solid rgba(7,26,21,.15);
}
.footer__brand-name{
  font-family:var(--font-serif);
  font-size:clamp(1.25rem,2.4vw,1.625rem);
  font-weight:600;
  letter-spacing:.06em;
  color:var(--ink);
  max-width:none;
}
.footer__brand-line{
  font-size:.8125rem;
  letter-spacing:.08em;
  color:#3C5A4E;
  max-width:none;
}
.footer__grid{
  display:grid;
  gap:clamp(20px,3vw,36px);
  grid-template-columns:1fr;
}
.footer__col{min-width:0}
.footer__col-title{
  font-family:var(--font-mono);
  font-size:.6875rem;
  font-weight:600;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--teal);
  margin-bottom:12px;
}
.footer__list{display:flex;flex-direction:column;gap:8px}
.footer__link{
  display:inline-block;
  padding:2px 0;
  color:var(--ink);
  font-size:.9375rem;
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer__link:hover{color:var(--teal);border-bottom-color:var(--teal)}
.footer__link:focus-visible{outline:2px solid var(--teal);outline-offset:3px}

.contact-row{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:2px 10px;
  font-size:.9375rem;
  line-height:1.6;
}
.contact-row__key{
  flex:0 0 auto;
  min-width:38px;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.14em;
  color:var(--teal);
}
.contact-row__val{color:var(--ink);word-break:break-word}
.copy-btn{
  min-height:28px;
  padding:3px 10px;
  border:1px solid rgba(7,26,21,.24);
  border-radius:999px;
  background-color:transparent;
  color:var(--teal);
  font-size:.6875rem;
  letter-spacing:.1em;
  cursor:pointer;
  transition:background-color .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease);
}
.copy-btn:hover{background-color:rgba(11,127,105,.1);border-color:var(--teal)}
.copy-btn[data-state="copied"]{background-color:rgba(11,127,105,.16);border-color:var(--teal)}
.copy-btn[data-state="failed"]{border-color:var(--orange);color:#B44A00}

.footer__bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:10px 24px;
  margin-top:clamp(22px,4vw,34px);
  padding-top:16px;
  border-top:1px solid rgba(7,26,21,.15);
  font-size:.8125rem;
  color:#3C5A4E;
}
.footer__note{max-width:52ch;color:#3C5A4E}
.footer__legal{
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.06em;
  color:#3C5A4E;
  max-width:none;
}
.footer__dot{margin:0 .55em;color:var(--line)}

/* ===== 08. Responsive ===== */
@media (max-width:359px){
  .brand__tag{display:none}
  .nav-toggle__label{display:none}
}
@media (min-width:600px){
  .footer__grid{grid-template-columns:repeat(2,1fr)}
}
@media (min-width:1024px){
  html{scroll-padding-top:28px}
  body{padding-left:var(--rail-w)}

  .site-header{
    position:fixed;
    top:0;bottom:0;left:0;
    width:var(--rail-w);
    border-bottom:0;
    border-right:1px solid var(--ink-3);
    background-color:var(--ink-2);
  }
  .rail{
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    gap:0;
    height:100%;
    min-height:0;
    padding:22px 20px 20px;
    overflow:hidden;
  }
  .rail__brand{justify-content:flex-start}
  .nav-toggle{display:none}
  .site-nav{
    position:static;
    top:auto;right:auto;bottom:auto;left:auto;
    width:auto;
    flex:1 1 auto;
    display:flex;
    flex-direction:column;
    gap:16px;
    padding:28px 0 0;
    background-color:transparent;
    border-right:0;
    overflow:visible;
    transform:none;
    visibility:visible;
    transition:none;
  }
  .site-nav__label{padding-bottom:12px}
  .nav-foot{margin-top:auto}
  .nav-scrim{display:none}
  .scroll-progress{
    top:0;bottom:0;left:var(--rail-w);right:auto;
    width:2px;height:auto;
    transform:scaleY(var(--progress,0));
    transform-origin:50% 0;
  }
  .grid--split{gap:clamp(24px,3vw,44px)}
}
@media (min-width:1024px){
  .footer__grid{grid-template-columns:1fr 1fr 1fr 1.6fr}
}

/* ===== 09. 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;
  }
  .scroll-progress{opacity:1}
}