*,*::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,ul,ol,li,figure,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit}
a{color:var(--cyan);text-decoration:none}

:root{
  --ink-900:#071426;
  --ink-800:#0C1E35;
  --ink-700:#122A45;
  --line:#1A3552;
  --cyan:#35F2E6;
  --amber:#FFB020;
  --magenta:#FF3D8B;
  --mist:#E8F1FF;
  --slate:#8FA6C4;
  --teal:#0E4C5C;
  --lime:#B6FF5C;
  --on-accent:#04121f;
  --frame-w:1440px;
  --gutter:clamp(16px,3vw,32px);
  --radius:4px;
  --bw:2px;
  --shadow-hard:6px 6px 0 0 rgba(3,9,18,.9);
  --shadow-teal:6px 6px 0 0 var(--teal);
  --mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --display:"Barlow Condensed","Oswald","Noto Sans SC","PingFang SC",system-ui,sans-serif;
  --ease:cubic-bezier(.22,.61,.36,1);
}

body{
  min-height:100vh;
  display:flex;
  flex-direction:column;
  background-color:var(--ink-900);
  background-image:
    linear-gradient(to right,rgba(26,53,82,.34) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(26,53,82,.34) 1px,transparent 1px);
  background-size:72px 72px;
  color:var(--mist);
  font-family:var(--sans);
  font-size:clamp(15px,1.02vw,17px);
  line-height:1.8;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
main{flex:1 0 auto;display:block}
::selection{background:var(--cyan);color:var(--on-accent)}

h1,h2,h3,h4{
  font-family:var(--display);
  font-weight:900;
  line-height:1.14;
  letter-spacing:-.01em;
  color:var(--mist);
  text-wrap:balance;
}
h1{font-size:clamp(2.4rem,6vw,4.4rem)}
h2{font-size:clamp(1.7rem,3.4vw,2.6rem)}
h3{font-size:clamp(1.15rem,1.8vw,1.4rem)}
h4{font-size:1.05rem}
strong{color:var(--mist);font-weight:700}
code,kbd,samp{font-family:var(--mono);font-size:.9em;color:var(--cyan)}

:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
  box-shadow:0 0 0 4px rgba(53,242,230,.16);
}

/* ---------- layout helpers ---------- */
.container{
  width:100%;
  max-width:var(--frame-w);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding:clamp(40px,6vw,88px) 0}
.section-head{
  display:grid;
  gap:.55rem;
  margin-bottom:clamp(20px,3vw,36px);
  border-top:var(--bw) solid var(--line);
  padding-top:clamp(14px,2vw,22px);
}
.kicker{
  display:flex;
  align-items:center;
  gap:.6em;
  margin:0;
  font-family:var(--mono);
  font-size:.72rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan);
}
.kicker::before{content:"";width:24px;height:2px;background:var(--cyan);flex:0 0 auto}
.section-title{margin:0;font-size:clamp(1.7rem,3.4vw,2.6rem)}
.index-num{
  font-family:var(--mono);
  font-size:.75rem;
  letter-spacing:.18em;
  color:var(--amber);
  display:inline-block;
}
.display-lg{
  font-family:var(--display);
  font-weight:900;
  font-size:clamp(3.2rem,8vw,7rem);
  line-height:.94;
  letter-spacing:-.02em;
  margin:0;
}
.display-md{
  font-family:var(--display);
  font-weight:900;
  font-size:clamp(2rem,4.6vw,3.4rem);
  line-height:1.02;
  letter-spacing:-.015em;
  margin:0;
}
.lede{
  font-size:clamp(1rem,1.4vw,1.15rem);
  line-height:1.8;
  color:var(--slate);
  max-width:68ch;
}
.visually-hidden{
  position:absolute!important;
  width:1px;height:1px;
  margin:-1px;padding:0;border:0;
  overflow:hidden;white-space:nowrap;
  clip:rect(0 0 0 0);clip-path:inset(50%);
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5em;
  padding:.78em 1.15em;
  border:var(--bw) solid var(--line);
  border-radius:2px;
  background:var(--ink-700);
  color:var(--mist);
  font-family:var(--mono);
  font-size:.76rem;
  letter-spacing:.12em;
  line-height:1.2;
  text-decoration:none;
  cursor:pointer;
  box-shadow:4px 4px 0 0 var(--teal);
  transition:border-color .16s var(--ease),color .16s var(--ease),box-shadow .16s var(--ease),background-color .16s var(--ease);
}
.btn:hover{
  border-color:var(--cyan);
  color:var(--cyan);
  box-shadow:2px 2px 0 0 var(--cyan);
}
.btn:active{box-shadow:0 0 0 0 var(--cyan)}
.btn-primary{
  background:var(--cyan);
  border-color:var(--cyan);
  color:var(--on-accent);
  font-weight:700;
  box-shadow:4px 4px 0 0 var(--teal);
}
.btn-primary:hover{
  background:var(--amber);
  border-color:var(--amber);
  color:var(--on-accent);
  box-shadow:2px 2px 0 0 var(--amber);
}

/* ---------- tags ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:.4em;
  padding:.28em .6em;
  border:1px solid currentColor;
  border-radius:2px;
  font-family:var(--mono);
  font-size:.68rem;
  letter-spacing:.14em;
  line-height:1.3;
  white-space:nowrap;
}
.tag-cyan{color:var(--cyan)}
.tag-amber{color:var(--amber)}
.tag-magenta{color:var(--magenta)}
.tag-lime{color:var(--lime)}

/* ---------- breadcrumbs ---------- */
.breadcrumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5em;
  margin:0 0 clamp(16px,2.4vw,28px);
  padding:0;
  list-style:none;
  font-family:var(--mono);
  font-size:.72rem;
  letter-spacing:.12em;
  color:var(--slate);
}
.breadcrumbs li{display:inline-flex;align-items:center;gap:.5em}
.breadcrumbs li+li::before{content:"/";color:var(--teal)}
.breadcrumb-link{
  color:var(--slate);
  border-bottom:1px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.breadcrumb-link:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.breadcrumb-current{color:var(--mist)}

/* ---------- bento grid & cards ---------- */
.bento-grid{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(12px,1.6vw,24px);
}
.bento-grid>*{grid-column:span 12;min-width:0}
.card{
  display:block;
  padding:clamp(16px,2.4vw,28px);
  background:var(--ink-800);
  border:var(--bw) solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow-hard);
  transition:border-color .16s var(--ease),box-shadow .16s var(--ease);
}
.card:hover{border-color:var(--cyan);box-shadow:2px 2px 0 0 var(--cyan)}
.card-title{
  margin:0 0 .5em;
  font-size:clamp(1.1rem,1.7vw,1.35rem);
  color:var(--mist);
}
.card-text{margin:0;color:var(--slate);font-size:.95rem;line-height:1.75}

/* ---------- media frames ---------- */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  border:var(--bw) solid var(--line);
  border-radius:var(--radius);
  background-color:var(--ink-800);
  background-image:
    repeating-linear-gradient(135deg,rgba(26,53,82,.85) 0 2px,transparent 2px 11px);
  box-shadow:var(--shadow-teal);
}
.media-frame img,
.media-frame svg{width:100%;height:100%;object-fit:cover;display:block}
.media-frame[data-label]::after{
  content:attr(data-label);
  position:absolute;
  left:0;bottom:0;
  padding:.34em .7em;
  background:rgba(7,20,38,.94);
  border-top:var(--bw) solid var(--line);
  border-right:var(--bw) solid var(--line);
  font-family:var(--mono);
  font-size:.66rem;
  letter-spacing:.14em;
  color:var(--cyan);
}
.ratio-wide{aspect-ratio:16/9}
.ratio-tall{aspect-ratio:4/5}
.ratio-square{aspect-ratio:1/1}

/* ---------- skip link ---------- */
.skip-link{
  position:absolute;
  left:14px;
  top:-72px;
  z-index:200;
  padding:.62em 1em;
  background:var(--cyan);
  color:var(--on-accent);
  border-radius:2px;
  font-family:var(--mono);
  font-size:.76rem;
  letter-spacing:.1em;
  box-shadow:4px 4px 0 0 var(--teal);
  transition:top .18s var(--ease);
}
.skip-link:focus{top:14px}

/* ---------- header ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:var(--ink-900);
  border-bottom:var(--bw) solid var(--line);
  box-shadow:0 3px 0 0 var(--teal);
}
.site-header::before{
  content:"";
  display:block;
  height:3px;
  background:linear-gradient(90deg,var(--cyan) 0 22%,var(--amber) 22% 38%,var(--magenta) 38% 44%,var(--teal) 44% 100%);
}
.header-frame{
  display:flex;
  align-items:center;
  gap:clamp(10px,1.6vw,24px);
  width:100%;
  max-width:var(--frame-w);
  margin-inline:auto;
  padding:0 var(--gutter);
  min-height:74px;
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
  color:var(--mist);
}
.brand-mark{
  position:relative;
  display:block;
  width:28px;
  height:28px;
  flex:0 0 auto;
  border:var(--bw) solid var(--cyan);
  border-radius:2px;
  box-shadow:3px 3px 0 0 var(--teal);
  transition:border-color .16s var(--ease),box-shadow .16s var(--ease);
}
.brand-mark::after{
  content:"";
  position:absolute;
  inset:6px;
  background:linear-gradient(135deg,var(--cyan),var(--amber));
}
.brand-text{display:flex;flex-direction:column;gap:2px;line-height:1.1}
.brand-line{
  font-family:var(--display);
  font-weight:900;
  font-size:1.06rem;
  letter-spacing:.02em;
  transition:color .16s var(--ease);
}
.brand-meta{
  font-family:var(--mono);
  font-size:.6rem;
  letter-spacing:.22em;
  color:var(--slate);
}
.brand:hover .brand-line{color:var(--cyan)}
.brand:hover .brand-mark{border-color:var(--amber);box-shadow:3px 3px 0 0 var(--amber)}

.site-nav{flex:1 1 auto;display:flex;justify-content:flex-end}
.nav-list{display:flex;flex-wrap:wrap;align-items:center;gap:2px}
.nav-link{
  display:inline-flex;
  align-items:center;
  gap:.5em;
  padding:.52em .7em;
  border:1px solid transparent;
  border-radius:2px;
  color:var(--slate);
  font-size:.9rem;
  letter-spacing:.02em;
  line-height:1.4;
  transition:color .16s var(--ease),background-color .16s var(--ease),border-color .16s var(--ease);
}
.nav-link::before{
  content:attr(data-num);
  font-family:var(--mono);
  font-size:.62rem;
  letter-spacing:.06em;
  color:var(--cyan);
  opacity:.62;
  transition:opacity .16s var(--ease),color .16s var(--ease);
}
.nav-link:hover{
  color:var(--mist);
  background:rgba(53,242,230,.08);
  border-color:rgba(53,242,230,.42);
}
.nav-link:hover::before{opacity:1}
.nav-link[aria-current="page"]{
  background:var(--cyan);
  border-color:var(--cyan);
  color:var(--on-accent);
  font-weight:700;
}
.nav-link[aria-current="page"]::before{color:var(--on-accent);opacity:1}

.version-badge{
  display:none;
  flex:0 0 auto;
  padding:.34em .62em;
  border:1px solid var(--amber);
  border-radius:2px;
  background:rgba(255,176,32,.09);
  color:var(--amber);
  font-family:var(--mono);
  font-size:.66rem;
  letter-spacing:.1em;
  line-height:1.5;
  white-space:nowrap;
}
.header-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto}

.nav-toggle{
  display:none;
  align-items:center;
  gap:.55em;
  padding:.56em .78em;
  background:var(--ink-800);
  border:var(--bw) solid var(--line);
  border-radius:2px;
  color:var(--mist);
  font-family:var(--mono);
  font-size:.7rem;
  letter-spacing:.16em;
  cursor:pointer;
  transition:border-color .16s var(--ease),color .16s var(--ease),background-color .16s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle[aria-expanded="true"]{
  background:var(--cyan);
  border-color:var(--cyan);
  color:var(--on-accent);
}
.nav-toggle-bars{position:relative;display:block;width:16px;height:10px;flex:0 0 auto}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";
  position:absolute;
  left:0;right:0;
  height:2px;
  background:currentColor;
  transition:top .18s var(--ease),transform .18s var(--ease);
}
.nav-toggle-bars::before{top:0}
.nav-toggle-bars::after{top:8px}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{top:4px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{top:4px;transform:rotate(-45deg)}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  margin-top:auto;
  background:var(--ink-800);
  border-top:var(--bw) solid var(--line);
}
.site-footer::before{
  content:"";
  display:block;
  height:4px;
  background:linear-gradient(90deg,var(--teal) 0 18%,var(--cyan) 18% 48%,var(--amber) 48% 76%,var(--magenta) 76% 100%);
}
.footer-frame{
  width:100%;
  max-width:var(--frame-w);
  margin-inline:auto;
  padding:clamp(30px,5vw,60px) var(--gutter) clamp(18px,3vw,30px);
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:clamp(22px,3vw,40px);
  padding-bottom:clamp(22px,3vw,38px);
  border-bottom:var(--bw) solid var(--line);
}
.footer-brand{display:grid;gap:.75rem;align-content:start}
.footer-brand-line{
  display:flex;
  align-items:center;
  gap:.6em;
  margin:0;
  font-family:var(--display);
  font-weight:900;
  font-size:1.32rem;
  letter-spacing:.02em;
  color:var(--mist);
}
.footer-brand-line::before{
  content:"";
  width:12px;height:12px;
  flex:0 0 auto;
  background:var(--cyan);
  box-shadow:3px 3px 0 0 var(--teal);
}
.footer-summary{margin:0;max-width:44ch;color:var(--slate);font-size:.95rem;line-height:1.8}
.footer-index-note{
  margin:0;
  padding-top:.7em;
  border-top:1px dashed var(--line);
  font-family:var(--mono);
  font-size:.66rem;
  letter-spacing:.14em;
  line-height:1.9;
  color:var(--amber);
}
.footer-col{display:grid;gap:.85rem;align-content:start}
.footer-col-title{
  margin:0;
  font-family:var(--mono);
  font-size:.68rem;
  font-weight:400;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan);
}
.footer-links{display:grid;gap:.5rem}
.footer-link{
  display:inline-block;
  color:var(--slate);
  font-size:.92rem;
  line-height:1.6;
  border-bottom:1px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.footer-link:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.footer-contact{display:grid;gap:.75rem}
.footer-contact-item{
  display:grid;
  gap:.1rem;
  padding-left:.75rem;
  border-left:var(--bw) solid var(--teal);
  transition:border-color .16s var(--ease);
}
.footer-contact-item:hover{border-left-color:var(--cyan)}
.footer-contact-key{
  font-family:var(--mono);
  font-size:.62rem;
  letter-spacing:.18em;
  color:var(--slate);
}
.footer-contact-value{color:var(--mist);font-size:.92rem;line-height:1.7;overflow-wrap:anywhere}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.6rem 1.6rem;
  padding-top:clamp(16px,2.4vw,26px);
  font-family:var(--mono);
  font-size:.7rem;
  letter-spacing:.08em;
  color:var(--slate);
}
.footer-copyright{margin:0}
.footer-icp{margin:0;color:var(--slate)}
.footer-legal{display:flex;flex-wrap:wrap;gap:.4rem 1.2rem}
.footer-legal .footer-link{font-size:.7rem;letter-spacing:.08em;font-family:var(--mono)}

/* ---------- scroll progress ---------- */
.scroll-progress{
  position:fixed;
  top:0;right:0;
  width:3px;
  height:100vh;
  transform:scaleY(0);
  transform-origin:top center;
  background:linear-gradient(180deg,var(--cyan) 0 55%,var(--amber) 78%,var(--magenta) 100%);
  z-index:90;
  pointer-events:none;
  transition:transform .1s linear;
}

/* ---------- responsive ---------- */
@media (min-width:640px){
  .card-text{font-size:1rem}
}
@media (min-width:768px){
  .bento-grid>*{grid-column:span 12}
  .bento-grid>.span-6{grid-column:span 6}
  .footer-top{grid-template-columns:minmax(0,1.4fr) minmax(0,1fr)}
  .footer-brand{grid-column:1 / -1}
}
@media (min-width:1024px){
  .bento-grid>.span-3{grid-column:span 3}
  .bento-grid>.span-4{grid-column:span 4}
  .bento-grid>.span-6{grid-column:span 6}
  .bento-grid>.span-8{grid-column:span 8}
  .bento-grid>.span-12{grid-column:span 12}
  .footer-top{grid-template-columns:minmax(0,1.5fr) minmax(0,.9fr) minmax(0,1.2fr)}
  .footer-brand{grid-column:auto}
}
@media (min-width:1200px){
  .version-badge{display:inline-block}
}
@media (max-width:1023px){
  .header-frame{justify-content:space-between;min-height:66px}
  .nav-toggle{display:inline-flex;margin-left:auto}
  .header-actions{margin-left:0}
  .site-nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    display:block;
    max-height:0;
    overflow:hidden;
    opacity:0;
    visibility:hidden;
    background:var(--ink-900);
    border-bottom:var(--bw) solid var(--cyan);
    box-shadow:0 8px 0 0 rgba(3,9,18,.6);
    transition:max-height .28s var(--ease),opacity .2s var(--ease),visibility .2s linear;
  }
  .site-nav[data-open="true"],
  .site-header[data-open="true"] .site-nav{
    max-height:76vh;
    overflow-y:auto;
    opacity:1;
    visibility:visible;
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:0;padding:10px var(--gutter) 20px}
  .nav-link{
    width:100%;
    justify-content:flex-start;
    padding:.85em .2em;
    border:0;
    border-bottom:1px solid var(--line);
    border-radius:0;
    font-size:.98rem;
  }
  .nav-link:hover{background:rgba(53,242,230,.08)}
  .nav-link[aria-current="page"]{
    background:transparent;
    color:var(--cyan);
    border-bottom-color:var(--cyan);
  }
  .nav-link[aria-current="page"]::before{color:var(--cyan)}
}
@media (max-width:639px){
  .header-actions{display:none}
  .brand-line{font-size:.98rem}
  .brand-meta{font-size:.56rem;letter-spacing:.18em}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    transition-duration:.001ms!important;
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
  }
  .scroll-progress{transition:none}
}