:root{
  --ink-900:#0B1626;
  --ink-800:#101F33;
  --ink-700:#1B2D45;
  --paper:#F5F1E6;
  --mist:#B9C6D4;
  --signal:#FF6A2A;
  --cyan:#2FE0CF;
  --line:#51677F;

  --hairline:rgba(81,103,127,.5);
  --hairline-soft:rgba(81,103,127,.34);
  --mist-dim:rgba(185,198,212,.78);

  --sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --dur:160ms;
  --ease:cubic-bezier(.33,.72,.24,1);
  --shell:1220px;
  --gutter:clamp(.9rem,4vw,2rem);
  --r-pill:999px;
  --r-card:14px;
  --r-sm:8px;
}

*,*::before,*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  text-size-adjust:100%;
  scroll-behavior:smooth;
}

body{
  margin:0;
  min-height:100vh;
  background-color:var(--ink-900);
  background-image:
    linear-gradient(rgba(81,103,127,.07) 1px,transparent 1px),
    linear-gradient(90deg,rgba(81,103,127,.07) 1px,transparent 1px);
  background-size:72px 72px,72px 72px;
  background-position:center top;
  color:var(--paper);
  font-family:var(--sans);
  font-size:17px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  word-break:normal;
  line-break:strict;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
img{height:auto}

a{color:var(--cyan);text-decoration:none;transition:color var(--dur) var(--ease)}
a:hover{color:var(--signal)}

button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}

::selection{background:var(--cyan);color:var(--ink-900)}

:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
  border-radius:4px;
}

#main-content{scroll-margin-top:7rem}

.mono{
  font-family:var(--mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.06em;
}

.label{
  display:inline-block;
  font-family:var(--mono);
  font-size:.66rem;
  font-weight:600;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--cyan);
}

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

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;
  top:.6rem;left:.6rem;
  z-index:200;
  padding:.6rem 1.1rem;
  border-radius:var(--r-pill);
  background:var(--paper);
  color:var(--ink-900);
  font-weight:700;
  font-size:.86rem;
  transform:translateY(-180%);
  transition:transform var(--dur) var(--ease);
}
.skip-link:hover{color:var(--ink-900)}
.skip-link:focus{transform:translateY(0);color:var(--ink-900)}

/* ---------- header ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  padding:clamp(.6rem,1.6vw,1.1rem) var(--gutter) 0;
}
.site-header::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:-1;
  background:linear-gradient(180deg,rgba(11,22,38,.95),rgba(11,22,38,0));
  opacity:0;
  transition:opacity var(--dur) var(--ease);
  pointer-events:none;
}
.site-header[data-compact]::before{opacity:1}

.scroll-progress{
  position:fixed;
  top:0;left:0;right:0;
  height:2px;
  z-index:140;
  pointer-events:none;
  background:rgba(81,103,127,.18);
}
.scroll-progress__bar{
  display:block;
  height:100%;
  width:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:var(--signal);
}

.header-rail{
  width:min(var(--shell),100%);
  margin-inline:auto;
}

.header-island{
  position:relative;
  display:flex;
  align-items:center;
  gap:clamp(.5rem,1.4vw,1.1rem);
  padding:.45rem .55rem .45rem .85rem;
  border:1px solid rgba(81,103,127,.55);
  border-radius:var(--r-pill);
  background:rgba(16,31,51,.92);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  box-shadow:0 18px 38px -26px #000,inset 0 1px 0 rgba(245,241,230,.06);
  transition:padding var(--dur) var(--ease),background var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.site-header[data-compact] .header-island{
  padding-block:.28rem;
  background:rgba(11,22,38,.97);
  border-color:rgba(81,103,127,.4);
}
.site-header[data-compact] .brand__tagline{display:none}

.brand{
  display:flex;
  align-items:center;
  gap:.6rem;
  min-width:0;
  color:var(--paper);
  flex:0 0 auto;
}
.brand:hover{color:var(--paper)}

.brand__mark{
  display:grid;
  place-items:center;
  flex:0 0 auto;
  width:38px;height:38px;
  border-radius:11px;
  border:1px solid rgba(47,224,207,.5);
  background:linear-gradient(155deg,rgba(47,224,207,.16),rgba(255,106,42,.14));
  color:var(--cyan);
  font-family:var(--mono);
  font-size:.9rem;
  font-weight:700;
  letter-spacing:.04em;
}

.brand__text{display:flex;flex-direction:column;min-width:0}
.brand__name{
  font-size:.98rem;
  font-weight:800;
  letter-spacing:-.01em;
  line-height:1.2;
  white-space:nowrap;
}
.brand__tagline{
  font-family:var(--mono);
  font-size:.6rem;
  line-height:1.45;
  letter-spacing:.08em;
  color:var(--mist-dim);
  text-transform:uppercase;
  white-space:nowrap;
}

.header-utility{
  display:flex;
  align-items:center;
  gap:.5rem;
  margin-left:.2rem;
  padding-left:clamp(.6rem,1.6vw,1.1rem);
  border-left:1px solid var(--hairline-soft);
  font-family:var(--mono);
  font-size:.64rem;
  letter-spacing:.07em;
  color:var(--mist);
  white-space:nowrap;
}
.header-utility__dot{
  width:6px;height:6px;
  border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(47,224,207,.14);
}
.header-utility__text{color:var(--mist-dim)}

.nav-toggle{
  display:none;
  align-items:center;
  gap:.5rem;
  padding:.45rem .75rem;
  border:1px solid rgba(81,103,127,.6);
  border-radius:var(--r-pill);
  color:var(--paper);
  font-size:.82rem;
  font-weight:600;
  transition:border-color var(--dur) var(--ease),color var(--dur) 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:currentColor;
  transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease);
}
.nav-toggle__label{
  font-family:var(--mono);
  font-size:.64rem;
  letter-spacing:.16em;
  text-transform:uppercase;
}

.site-nav{
  display:flex;
  align-items:center;
  gap:.4rem;
  margin-left:auto;
  min-width:0;
}
.site-nav__list{
  display:flex;
  align-items:center;
  gap:.1rem;
}
.site-nav__item{display:flex}
.site-nav__link{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  padding:.44rem .74rem;
  border:1px solid transparent;
  border-radius:var(--r-pill);
  color:var(--mist);
  font-size:.855rem;
  font-weight:500;
  white-space:nowrap;
  transition:color var(--dur) var(--ease),background var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.site-nav__link:hover{
  color:var(--paper);
  background:var(--ink-700);
}
.site-nav__link[aria-current="page"]{
  color:var(--ink-900);
  background:var(--paper);
  border-color:var(--paper);
  font-weight:700;
}
.site-nav__link[aria-current="page"]::before{
  content:"";
  width:5px;height:5px;
  border-radius:1px;
  background:var(--signal);
}
.site-nav__cta{flex:0 0 auto}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.45rem;
  padding:.52rem 1.05rem;
  border:1px solid transparent;
  border-radius:var(--r-pill);
  font-family:var(--sans);
  font-size:.85rem;
  font-weight:700;
  letter-spacing:.01em;
  line-height:1.3;
  text-align:center;
  transition:transform var(--dur) var(--ease),background var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn--signal{background:var(--signal);border-color:var(--signal);color:#14100C}
.btn--signal:hover{background:#FF824F;border-color:#FF824F;color:#14100C}
.btn--ghost{background:transparent;border-color:rgba(81,103,127,.85);color:var(--paper)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.btn--paper{background:var(--paper);border-color:var(--paper);color:var(--ink-900)}
.btn--paper:hover{background:#fff;border-color:#fff;color:var(--ink-900)}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(2.5rem,6vw,5rem);
  background:var(--ink-800);
  border-top:1px solid var(--hairline-soft);
  color:var(--mist);
  font-size:.9rem;
}
.footer-shell{
  width:min(var(--shell),100%);
  margin-inline:auto;
  padding:clamp(1.75rem,4vw,2.75rem) var(--gutter) clamp(1rem,2.5vw,1.6rem);
}

.tick-rule{
  position:relative;
  height:1px;
  background:var(--hairline-soft);
  margin-bottom:clamp(1.4rem,3.2vw,2.2rem);
}
.tick-rule::after{
  content:"";
  position:absolute;
  left:0;right:0;top:-4px;
  height:4px;
  background-image:repeating-linear-gradient(90deg,rgba(81,103,127,.55) 0 1px,transparent 1px 26px);
}

.footer-grid{
  display:grid;
  grid-template-columns:minmax(0,1.5fr) minmax(0,1.2fr) minmax(0,.85fr) minmax(0,.85fr);
  gap:clamp(1.5rem,3.5vw,2.75rem);
}

.footer-brand__link{
  display:inline-flex;
  align-items:center;
  gap:.55rem;
  color:var(--paper);
  font-size:1rem;
  font-weight:800;
  letter-spacing:-.01em;
}
.footer-brand__link:hover{color:var(--paper)}
.footer-brand__mark{
  display:grid;
  place-items:center;
  width:32px;height:32px;
  border-radius:9px;
  border:1px solid rgba(47,224,207,.45);
  color:var(--cyan);
  font-family:var(--mono);
  font-size:.78rem;
  font-weight:700;
  letter-spacing:.04em;
}
.footer-brand__name{line-height:1.2}
.footer-brand__line{
  margin-top:.75rem;
  font-family:var(--mono);
  font-size:.68rem;
  letter-spacing:.07em;
  color:var(--mist-dim);
}
.footer-note{
  margin-top:.65rem;
  max-width:38ch;
  font-size:.84rem;
  line-height:1.72;
  color:var(--mist);
}
.footer-note--mono{
  font-family:var(--mono);
  font-size:.64rem;
  letter-spacing:.11em;
  text-transform:uppercase;
  color:rgba(185,198,212,.66);
}

.footer-col{min-width:0}
.footer-title{
  margin-bottom:.85rem;
  padding-bottom:.5rem;
  border-bottom:1px solid var(--hairline-soft);
  font-family:var(--mono);
  font-size:.66rem;
  font-weight:600;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--paper);
}

.footer-contact{display:grid;gap:.7rem}
.footer-contact__item{display:grid;gap:.15rem;min-width:0}
.footer-contact__label{
  font-family:var(--mono);
  font-size:.6rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:rgba(185,198,212,.66);
}
.footer-contact__row{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5rem;
}
.footer-contact__value{
  font-family:var(--mono);
  font-size:.79rem;
  letter-spacing:.02em;
  color:var(--paper);
  overflow-wrap:anywhere;
}
.footer-contact__note{
  margin-top:.9rem;
  max-width:35ch;
  font-size:.75rem;
  line-height:1.7;
  color:rgba(185,198,212,.78);
}

.footer-nav__list{display:grid;gap:.5rem}
.footer-nav__link{
  display:inline-block;
  color:var(--mist);
  font-size:.87rem;
  border-bottom:1px solid transparent;
  padding-bottom:1px;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.footer-nav__link:hover{color:var(--cyan);border-bottom-color:rgba(47,224,207,.55)}

.copy-btn{
  display:inline-flex;
  align-items:center;
  gap:.3rem;
  padding:.16rem .5rem;
  border:1px solid rgba(81,103,127,.6);
  border-radius:6px;
  font-family:var(--mono);
  font-size:.62rem;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--mist);
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.copy-btn:hover{color:var(--cyan);border-color:var(--cyan)}
.copy-btn[data-copied]{color:var(--signal);border-color:var(--signal);background:rgba(255,106,42,.12)}

.footer-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.7rem 1.25rem;
  margin-top:clamp(1.75rem,4vw,2.5rem);
  padding-top:1rem;
  border-top:1px solid var(--hairline-soft);
}
.footer-copy{
  font-family:var(--mono);
  font-size:.68rem;
  letter-spacing:.05em;
  color:rgba(185,198,212,.82);
}
.footer-legal{
  display:flex;
  flex-wrap:wrap;
  gap:.35rem 1rem;
  margin-left:auto;
}
.footer-legal__link{
  font-family:var(--mono);
  font-size:.66rem;
  letter-spacing:.09em;
  text-transform:uppercase;
  color:var(--mist);
}
.footer-legal__link:hover{color:var(--signal)}
.footer-ticks{
  display:flex;
  gap:.3rem;
  width:100%;
  margin-top:.2rem;
}
.footer-tick{
  flex:1 1 auto;
  min-width:1.4rem;
  padding-top:.32rem;
  border-top:1px solid var(--hairline-soft);
  font-family:var(--mono);
  font-size:.58rem;
  letter-spacing:.1em;
  color:rgba(81,103,127,.9);
}

/* ---------- layout ---------- */
.page-shell{
  width:min(var(--shell),100%);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.section{padding-block:clamp(2.25rem,5vw,4rem)}
.section__head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:.6rem .9rem;
  padding-bottom:.75rem;
  margin-bottom:clamp(1rem,2.5vw,1.75rem);
  border-bottom:1px solid var(--hairline-soft);
}
.section__num{
  font-family:var(--mono);
  font-size:.72rem;
  letter-spacing:.16em;
  color:var(--signal);
}
.section__title{
  font-size:clamp(1.3rem,3vw,1.95rem);
  font-weight:900;
  letter-spacing:-.02em;
  line-height:1.16;
  color:var(--paper);
}
.section__desc{
  max-width:54ch;
  color:var(--mist);
  font-size:.94rem;
}
.section__band{
  background:var(--ink-800);
  border-block:1px solid var(--hairline-soft);
}

.grid{display:grid;gap:clamp(1rem,2.5vw,1.75rem)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--7-5{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.grid--8-4{grid-template-columns:minmax(0,8fr) minmax(0,4fr)}

/* ---------- crumbs ---------- */
.crumbs{
  padding-block:1rem .25rem;
  font-family:var(--mono);
  font-size:.68rem;
  letter-spacing:.09em;
  text-transform:uppercase;
  color:var(--mist);
}
.crumbs__list{display:flex;flex-wrap:wrap;align-items:center;gap:.4rem}
.crumbs__item{display:flex;align-items:center;gap:.4rem}
.crumbs__link{color:var(--mist)}
.crumbs__link:hover{color:var(--cyan)}
.crumbs__sep{color:rgba(81,103,127,.9)}
.crumbs__item[aria-current="page"]{color:var(--paper)}

/* ---------- cards ---------- */
.card{
  position:relative;
  padding:clamp(1rem,2vw,1.4rem);
  border:1px solid var(--hairline);
  border-radius:var(--r-card);
  background:var(--ink-800);
  transition:transform var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.card:hover{transform:translateY(-2px);border-color:rgba(47,224,207,.5)}
.card--paper{
  background:var(--paper);
  border-color:#D9D2C2;
  color:#12202F;
}
.card--paper:hover{border-color:var(--signal)}
.card--paper .card__title{color:var(--ink-900)}
.card--paper .card__meta{color:rgba(18,32,47,.62)}
.card--stack{
  box-shadow:6px 6px 0 -1px var(--ink-700),12px 12px 0 -2px rgba(27,45,69,.55);
}
.card__head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:.6rem;
  margin-bottom:.55rem;
}
.card__title{
  font-size:1.02rem;
  font-weight:800;
  line-height:1.35;
  letter-spacing:-.01em;
  color:var(--paper);
}
.card__meta{
  font-family:var(--mono);
  font-size:.66rem;
  letter-spacing:.09em;
  text-transform:uppercase;
  color:var(--mist);
}

.doc-tray{
  display:flex;
  gap:clamp(.75rem,2vw,1.1rem);
  overflow-x:auto;
  padding-bottom:.85rem;
  scroll-snap-type:x mandatory;
  scrollbar-color:var(--line) transparent;
  scrollbar-width:thin;
}
.doc-tray::-webkit-scrollbar{height:6px}
.doc-tray::-webkit-scrollbar-thumb{background:var(--line);border-radius:3px}
.doc-tray__item{
  flex:0 0 clamp(230px,68vw,320px);
  scroll-snap-align:start;
}

/* ---------- tags ---------- */
.tag-row{display:flex;flex-wrap:wrap;gap:.4rem}
.tag{
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  padding:.26rem .64rem;
  border:1px solid rgba(81,103,127,.6);
  border-radius:var(--r-pill);
  background:rgba(27,45,69,.55);
  color:var(--mist);
  font-family:var(--mono);
  font-size:.66rem;
  letter-spacing:.08em;
  text-transform:uppercase;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.tag:hover{color:var(--paper);border-color:var(--cyan)}
.tag[aria-pressed="true"]{
  color:var(--signal);
  border-color:var(--signal);
  background:rgba(255,106,42,.12);
}

/* ---------- media ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16/9;
  border:1px solid var(--hairline);
  border-radius:var(--r-card);
  background-color:var(--ink-700);
  background-image:
    repeating-linear-gradient(0deg,rgba(81,103,127,.16) 0 1px,transparent 1px 28px),
    repeating-linear-gradient(90deg,rgba(81,103,127,.16) 0 1px,transparent 1px 28px);
}
.media-frame > img,
.media-frame > svg{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:4/5}

/* ---------- misc ---------- */
.note-callout{
  padding:.55rem 0 .55rem 1rem;
  border-left:2px solid var(--signal);
  color:var(--mist);
  font-size:.88rem;
}

/* ---------- responsive ---------- */
@media (max-width:1200px){
  .header-utility{display:none}
}

@media (max-width:1040px){
  .nav-toggle{display:inline-flex;margin-left:auto}
  .site-nav{
    position:absolute;
    top:calc(100% + .55rem);
    left:0;
    right:0;
    display:flex;
    flex-direction:column;
    align-items:stretch;
    gap:.5rem;
    margin:0;
    padding:.7rem;
    border:1px solid rgba(81,103,127,.6);
    border-radius:18px;
    background:var(--ink-800);
    box-shadow:0 28px 60px -34px #000;
    opacity:0;
    visibility:hidden;
    transform:translateY(-.4rem);
    transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),visibility var(--dur) linear;
  }
  .site-header[data-open] .site-nav{
    opacity:1;
    visibility:visible;
    transform:translateY(0);
  }
  .site-nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:.15rem;
  }
  .site-nav__link{
    justify-content:space-between;
    padding:.7rem .85rem;
    border-color:rgba(81,103,127,.35);
    border-radius:12px;
    font-size:.94rem;
  }
  .site-nav__link[aria-current="page"]{border-color:var(--paper)}
  .site-nav__cta{width:100%;margin-top:.35rem;padding:.7rem 1rem}
  .nav-toggle[aria-expanded="true"]{border-color:var(--cyan);color:var(--cyan)}
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(3px) rotate(45deg)}
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){transform:translateY(-3px) rotate(-45deg)}
}

@media (max-width:900px){
  .grid--2,.grid--3,.grid--7-5,.grid--8-4{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:640px){
  body{font-size:16px}
  .brand__tagline{display:none}
  .brand__mark{width:34px;height:34px;font-size:.82rem}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-legal{margin-left:0}
  .footer-ticks{display:none}
  .media-frame{aspect-ratio:4/3}
  .section__head{gap:.4rem .6rem}
}

@media (max-width:380px){
  .nav-toggle__label{display:none}
  .brand__name{font-size:.9rem}
}

@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-behavior:auto!important;
  }
  .card:hover,.btn:hover{transform:none}
}