:root{
  --ink-950:#04130E;
  --ink-900:#0A241B;
  --ink-800:#113528;
  --lime:#D8FF3E;
  --blue:#3BC7F3;
  --mint:#BDF5D9;
  --paper:#F3F8F2;
  --amber:#FFD166;
  --slate:#93A99F;
  --text:#E4F1E8;
  --line:rgba(189,245,217,.16);
  --line-soft:rgba(189,245,217,.08);
  --line-strong:rgba(216,255,62,.42);
  --font-display:"Barlow Condensed","Oswald","Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --w-max:1240px;
  --gutter:clamp(16px,4vw,48px);
  --header-pad:clamp(10px,2vw,18px);
}

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

html,body{background:var(--ink-950)}
body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.7;
  color:var(--text);
  min-height:100vh;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
@media (min-width:768px){body{font-size:17px}}

h1,h2,h3{
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.15;
  letter-spacing:.01em;
  color:var(--paper);
}
h1{font-size:clamp(2.1rem,5.6vw,4.2rem);letter-spacing:.02em}
h2{font-size:clamp(1.45rem,3vw,2.15rem)}
h3{font-size:clamp(1.05rem,1.9vw,1.32rem)}
p{max-width:72ch}

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

.section{padding-block:clamp(40px,6vw,84px)}
.section--band{
  background:var(--ink-900);
  border-block:1px solid var(--line);
}
.divider{
  height:1px;
  border:0;
  background:linear-gradient(90deg,transparent,var(--line-strong),transparent);
}

.grid{display:grid;gap:clamp(18px,3vw,34px)}
.grid--5-7{grid-template-columns:5fr 7fr}
.grid--4-8{grid-template-columns:4fr 8fr}
@media (max-width:900px){
  .grid--5-7,.grid--4-8{grid-template-columns:1fr}
}

.kicker{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--blue);
}
.kicker::before{content:"";width:20px;height:1px;background:currentColor}

.mono{font-family:var(--font-mono);letter-spacing:.04em}

.prose{max-width:68ch;color:var(--mint)}
.prose p+p{margin-top:1em}
.prose a{color:var(--blue);border-bottom:1px solid rgba(59,199,243,.4)}
.prose a:hover{color:var(--lime);border-bottom-color:var(--lime)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.12em;
  padding:3px 8px;
  border:1px solid rgba(59,199,243,.42);
  background:rgba(59,199,243,.09);
  color:var(--blue);
  white-space:nowrap;
}
.tag--lime{
  border-color:rgba(216,255,62,.5);
  background:rgba(216,255,62,.12);
  color:var(--lime);
}

.btn{
  display:inline-flex;
  align-items:center;
  gap:.55em;
  font-family:var(--font-mono);
  font-size:.78rem;
  font-weight:700;
  letter-spacing:.12em;
  text-transform:uppercase;
  padding:.82em 1.3em;
  border:1px solid var(--line-strong);
  color:var(--paper);
  background:transparent;
  transition:background .18s ease,color .18s ease,border-color .18s ease,transform .18s ease;
}
.btn::after{content:"↗";font-size:.92em;line-height:1}
.btn:hover{transform:translateX(2px)}
.btn--primary{background:var(--lime);border-color:var(--lime);color:var(--ink-950)}
.btn--primary:hover{background:var(--blue);border-color:var(--blue);color:var(--ink-950)}
.btn--ghost{border-color:var(--line);color:var(--mint)}
.btn--ghost:hover{border-color:var(--blue);color:var(--blue)}
.btn--quiet{
  border-color:transparent;
  color:var(--lime);
  padding:.5em 0;
}
.btn--quiet:hover{color:var(--blue)}

.breadcrumb{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.1em;
  color:var(--slate);
  padding-block:18px;
}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__item+.breadcrumb__item::before{content:"/";color:var(--line-strong)}
.breadcrumb__link{color:var(--mint);transition:color .16s ease}
.breadcrumb__link:hover{color:var(--lime)}
.breadcrumb__item[aria-current="page"]{color:var(--paper)}

.img-frame{
  position:relative;
  display:grid;
  place-items:center;
  overflow:hidden;
  aspect-ratio:16/9;
  border:1px solid var(--line);
  background:
    radial-gradient(circle at 72% 18%,rgba(59,199,243,.20),transparent 58%),
    radial-gradient(circle at 12% 88%,rgba(216,255,62,.14),transparent 55%),
    linear-gradient(142deg,var(--ink-800),var(--ink-950));
}
.img-frame::after{
  content:"";
  position:absolute;
  right:0;
  bottom:0;
  width:42%;
  height:42%;
  background:linear-gradient(135deg,transparent 50%,rgba(216,255,62,.12) 50%);
  pointer-events:none;
}
.img-frame img{width:100%;height:100%;object-fit:cover}
.img-frame--wide{aspect-ratio:21/9}
.img-frame--tall{aspect-ratio:4/5}
.img-frame--square{aspect-ratio:1/1}
.img-frame__label{
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--slate);
  padding:0 12px;
  text-align:center;
}

/* ---------- header ---------- */
.skip-link{
  position:absolute;
  left:12px;
  top:-60px;
  z-index:200;
  padding:10px 16px;
  background:var(--lime);
  color:var(--ink-950);
  font-family:var(--font-mono);
  font-size:.78rem;
  letter-spacing:.1em;
  transition:top .16s ease;
}
.skip-link:focus{top:12px}

.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:linear-gradient(180deg,rgba(4,19,14,.98),rgba(10,36,27,.96));
  border-bottom:1px solid var(--line-strong);
  backdrop-filter:blur(8px);
}
.site-header::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:linear-gradient(90deg,rgba(59,199,243,.07) 1px,transparent 1px);
  background-size:72px 100%;
  pointer-events:none;
}
.header-inner{position:relative;z-index:2}

.header-top{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:14px;
  padding-block:var(--header-pad);
}

.header-status{
  display:flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--slate);
  justify-self:start;
}
.status-dot{
  width:7px;
  height:7px;
  border-radius:50%;
  background:var(--lime);
  box-shadow:0 0 0 3px rgba(216,255,62,.16);
  animation:statusPulse 2.6s ease-in-out infinite;
}
.header-status__label{color:var(--mint)}
.header-status__ver{
  color:var(--lime);
  border:1px solid rgba(216,255,62,.44);
  padding:0 6px;
  font-weight:700;
}

.masthead{display:block;text-align:center;justify-self:center}
.masthead__mark{
  display:block;
  font-family:var(--font-display);
  font-size:clamp(1.3rem,2.6vw,1.92rem);
  font-weight:800;
  letter-spacing:.16em;
  line-height:1.1;
  color:var(--paper);
  transition:color .18s ease;
}
.masthead__tag{
  display:block;
  margin-top:5px;
  font-family:var(--font-mono);
  font-size:.64rem;
  letter-spacing:.3em;
  color:var(--blue);
}
.masthead:hover .masthead__mark{color:var(--lime)}

.header-actions{
  display:flex;
  align-items:center;
  gap:10px;
  justify-self:end;
}
.header-quick{
  font-family:var(--font-mono);
  font-size:.72rem;
  font-weight:700;
  letter-spacing:.1em;
  padding:9px 14px;
  background:var(--lime);
  color:var(--ink-950);
  border:1px solid var(--lime);
  transition:background .18s ease,color .18s ease,border-color .18s ease;
}
.header-quick:hover{background:var(--blue);border-color:var(--blue);color:var(--ink-950)}

.nav-toggle{
  display:none;
  grid-template-columns:auto auto;
  align-items:center;
  column-gap:9px;
  row-gap:5px;
  padding:9px 12px;
  border:1px solid var(--line);
  background:rgba(17,53,40,.7);
  color:var(--mint);
}
.nav-toggle__bar{
  display:block;
  grid-column:1;
  width:16px;
  height:2px;
  background:currentColor;
  transition:transform .18s ease;
}
.nav-toggle__bar:nth-child(1){grid-area:1/1}
.nav-toggle__bar:nth-child(2){grid-area:2/1}
.nav-toggle__text{
  grid-column:2;
  grid-row:1 / span 2;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.14em;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1){transform:translateY(3.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2){transform:translateY(-3.5px) rotate(-45deg)}

.site-nav{border-top:1px solid var(--line)}
.nav__list{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:2px;
}
.nav__link{
  display:inline-flex;
  align-items:baseline;
  gap:8px;
  padding:12px 18px;
  font-size:.94rem;
  color:var(--mint);
  transition:color .18s ease,background .18s ease;
}
.nav__index{
  font-family:var(--font-mono);
  font-size:.6rem;
  letter-spacing:.1em;
  color:var(--slate);
  transition:color .18s ease;
}
.nav__link:hover{color:var(--lime);background:rgba(216,255,62,.07)}
.nav__link[aria-current="page"]{
  background:var(--lime);
  color:var(--ink-950);
  font-weight:700;
}
.nav__link[aria-current="page"] .nav__index{color:rgba(4,19,14,.62)}

.scroll-rail{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  background:rgba(189,245,217,.1);
  z-index:3;
}
.scroll-rail span{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--lime),var(--blue));
  transition:width .1s linear;
}

@media (max-width:900px){
  .header-top{grid-template-columns:1fr auto;gap:10px}
  .header-status{display:none}
  .masthead{justify-self:start;text-align:left}
  .masthead__tag{display:none}
  .nav-toggle{display:grid}
  .header-quick{font-size:.68rem;padding:8px 10px}
  .site-nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    display:none;
    background:var(--ink-900);
    border-top:1px solid var(--line-strong);
    box-shadow:0 26px 44px rgba(0,0,0,.55);
    padding:8px var(--gutter) 20px;
    max-height:calc(100vh - 90px);
    overflow-y:auto;
  }
  .site-nav[data-open]{display:block}
  .nav__list{flex-direction:column;gap:0}
  .nav__link{
    display:flex;
    width:100%;
    padding:14px 6px;
    font-size:1rem;
    border-bottom:1px solid var(--line);
  }
  .nav__link[aria-current="page"]{
    background:transparent;
    color:var(--lime);
    border-left:3px solid var(--lime);
    padding-left:14px;
  }
  .nav__link[aria-current="page"] .nav__index{color:var(--lime)}
}
@media (max-width:420px){
  .header-quick{display:none}
  .masthead__mark{font-size:1.16rem;letter-spacing:.1em}
}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  background:var(--ink-900);
  border-top:1px solid var(--line-strong);
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:linear-gradient(180deg,rgba(189,245,217,.05) 1px,transparent 1px);
  background-size:100% 34px;
  pointer-events:none;
}
.footer-main{
  position:relative;
  z-index:1;
  display:grid;
  grid-template-columns:minmax(0,1.3fr) minmax(0,1.5fr) minmax(0,1.1fr);
  gap:clamp(24px,4vw,56px);
  padding-block:clamp(40px,6vw,64px) clamp(28px,4vw,44px);
}
.footer-intro{display:flex;flex-direction:column;align-items:flex-start;gap:14px}
.footer-brand{
  font-family:var(--font-display);
  font-size:1.5rem;
  font-weight:800;
  letter-spacing:.14em;
  color:var(--paper);
  line-height:1.2;
}
.footer-summary{
  font-size:.94rem;
  line-height:1.65;
  color:var(--slate);
  max-width:32ch;
}
.footer-nav{display:grid;grid-template-columns:1fr 1fr;gap:clamp(18px,3vw,32px)}
.footer-nav__title{
  font-family:var(--font-mono);
  font-size:.68rem;
  font-weight:600;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--blue);
  margin-bottom:14px;
}
.footer-nav__link{
  display:inline-block;
  padding:5px 0;
  font-size:.94rem;
  color:var(--mint);
  transition:color .16s ease,transform .16s ease;
}
.footer-nav__link:hover{color:var(--lime);transform:translateX(3px)}

.footer-contact__list{display:flex;flex-direction:column;gap:8px}
.footer-contact__row{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:8px;
  font-size:.88rem;
}
.contact-key{
  font-family:var(--font-mono);
  font-size:.64rem;
  letter-spacing:.14em;
  color:var(--slate);
  min-width:38px;
}
.contact-value{color:var(--mint);word-break:break-word}
.copy-btn{
  font-family:var(--font-mono);
  font-size:.62rem;
  letter-spacing:.1em;
  padding:1px 7px;
  border:1px solid var(--line);
  color:var(--slate);
  transition:color .16s ease,border-color .16s ease,background .16s ease;
}
.copy-btn:hover{border-color:var(--lime);color:var(--lime)}
.copy-btn[data-copied]{
  background:var(--lime);
  border-color:var(--lime);
  color:var(--ink-950);
}
.footer-note{
  margin-top:14px;
  font-size:.76rem;
  line-height:1.7;
  color:var(--slate);
  max-width:40ch;
}

.footer-legal{
  position:relative;
  z-index:1;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px 22px;
  padding-block:18px 26px;
  border-top:1px solid var(--line);
}
.footer-meta{
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.08em;
  color:var(--slate);
  max-width:none;
}
.footer-legal__links{display:flex;flex-wrap:wrap;gap:18px;margin-left:auto}
.footer-legal__links a{
  font-size:.78rem;
  color:var(--mint);
  transition:color .16s ease;
}
.footer-legal__links a:hover{color:var(--lime)}

@media (max-width:1023px){
  .footer-main{grid-template-columns:1fr 1fr}
  .footer-intro{grid-column:1 / -1}
}
@media (max-width:639px){
  .footer-main{grid-template-columns:1fr}
  .footer-nav{grid-template-columns:1fr 1fr}
  .footer-legal__links{margin-left:0;width:100%}
}

/* ---------- floating / motion ---------- */
.to-top{
  position:fixed;
  right:clamp(14px,3vw,28px);
  bottom:clamp(14px,3vw,28px);
  z-index:90;
  width:44px;
  height:44px;
  display:grid;
  place-items:center;
  background:var(--lime);
  color:var(--ink-950);
  font-family:var(--font-mono);
  font-size:1.05rem;
  line-height:1;
  border:1px solid rgba(4,19,14,.4);
  box-shadow:0 12px 26px rgba(0,0,0,.5);
  opacity:0;
  visibility:hidden;
  transform:translateY(10px);
  transition:opacity .22s ease,transform .22s ease,visibility .22s ease,background .18s ease;
}
.to-top[data-visible]{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:var(--blue)}

[data-reveal]{opacity:1}
html.has-js [data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .5s ease,transform .5s ease;
}
html.has-js [data-reveal].is-revealed{opacity:1;transform:none}

@keyframes statusPulse{
  0%,100%{box-shadow:0 0 0 3px rgba(216,255,62,.16)}
  50%{box-shadow:0 0 0 6px rgba(216,255,62,.05)}
}

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