*,*::before,*::after{box-sizing:border-box}
*{margin:0}
html{-webkit-text-size-adjust:100%}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0}
ul,ol{list-style:none;padding:0}
a{color:var(--cyan);text-decoration:none}

:root{
  --ink:#07111F;
  --panel:#0D1B2E;
  --line:#1C3350;
  --cyan:#37F2D6;
  --orange:#FF5A36;
  --silver:#A8B3C2;
  --paper:#E8F1FF;
  --violet:#7B61FF;
  --green:#3DDC97;
  --yellow:#FFC857;
  --text:#BAC8DA;
  --font-display:"Inter","Helvetica Neue",Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-body:"Inter","Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono","SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
  --shell:1200px;
  --gutter:clamp(16px,4vw,40px);
}

body{
  min-height:100vh;
  background-color:var(--ink);
  background-image:
    radial-gradient(1000px 620px at 12% -12%,rgba(55,242,214,.09),transparent 62%),
    radial-gradient(820px 560px at 92% 2%,rgba(123,97,255,.10),transparent 60%),
    repeating-linear-gradient(90deg,rgba(28,51,80,.42) 0 1px,transparent 1px 80px),
    repeating-linear-gradient(0deg,rgba(28,51,80,.26) 0 1px,transparent 1px 80px);
  background-attachment:fixed;
  color:var(--text);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

h1,h2,h3,h4{
  font-family:var(--font-display);
  color:var(--paper);
  font-weight:800;
  line-height:1.15;
  letter-spacing:.02em;
}
p{max-width:72ch}

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

/* ---------- shell utilities ---------- */
.container{width:min(calc(100% - var(--gutter) * 2),var(--shell));margin-inline:auto}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.06em}
.muted{color:var(--silver)}
.rule{height:1px;border:0;background:var(--line);margin:0}

.section{position:relative;padding-block:clamp(40px,6vw,88px)}
.section--panel{
  background:linear-gradient(180deg,rgba(13,27,46,.92),rgba(7,17,31,0));
  border-block:1px solid var(--line);
}
.section-head{
  display:flex;align-items:flex-end;justify-content:space-between;
  gap:16px;flex-wrap:wrap;
  padding-bottom:14px;border-bottom:1px solid var(--line);
  margin-bottom:clamp(20px,3.4vw,40px);
}
.section-title{font-size:clamp(24px,3.4vw,44px);letter-spacing:.06em;line-height:1.1}
.kicker{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11px;font-weight:400;
  letter-spacing:.24em;text-transform:uppercase;color:var(--cyan);
}
.kicker::before{content:"";width:20px;height:1px;background:var(--cyan)}
.index-num{
  display:block;font-family:var(--font-mono);font-weight:200;
  font-size:clamp(56px,12vw,140px);line-height:.86;letter-spacing:.02em;
  color:var(--paper);
}
.index-num--accent{color:var(--orange)}

.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(14px,2.2vw,30px)}
@media (max-width:899px){.grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}}
@media (max-width:599px){.grid-12{grid-template-columns:repeat(2,minmax(0,1fr))}}

/* ---------- buttons / tags / chips ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 20px;border:1px solid var(--line);
  background:var(--panel);color:var(--paper);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;
  text-decoration:none;cursor:pointer;white-space:nowrap;
  transition:transform .18s ease,background .18s ease,border-color .18s ease,color .18s ease;
}
.btn:hover{transform:translateY(-2px)}
.btn--accent{background:var(--orange);border-color:var(--orange);color:#120A08;font-weight:700}
.btn--accent:hover{background:#ff7454;border-color:#ff7454;box-shadow:0 12px 28px -16px rgba(255,90,54,.9)}
.btn--ghost{background:transparent;border-color:rgba(55,242,214,.55);color:var(--cyan)}
.btn--ghost:hover{background:rgba(55,242,214,.1);border-color:var(--cyan)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;border:1px solid var(--line);
  background:rgba(7,17,31,.6);color:var(--silver);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;line-height:1.6;
}
.tag--accent{color:var(--orange);border-color:rgba(255,90,54,.55);background:rgba(255,90,54,.08)}
.tag--violet{color:var(--violet);border-color:rgba(123,97,255,.55);background:rgba(123,97,255,.09)}

.chip{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  padding:7px 12px;border:1px solid var(--line);
  background:rgba(13,27,46,.65);color:var(--silver);cursor:pointer;
  transition:color .18s,border-color .18s,background .18s;
}
.chip:hover{color:var(--paper);border-color:var(--silver)}
.chip[aria-pressed="true"]{background:var(--cyan);border-color:var(--cyan);color:#04121B}

/* ---------- panels / media frames ---------- */
.panel{
  position:relative;
  background:linear-gradient(180deg,rgba(13,27,46,.96),rgba(13,27,46,.82));
  border:1px solid var(--line);
  padding:clamp(16px,2.4vw,28px);
}
.panel--cut{clip-path:polygon(0 0,100% 0,100% calc(100% - 20px),calc(100% - 20px) 100%,0 100%)}

.frame{
  position:relative;display:block;overflow:hidden;isolation:isolate;
  background:var(--panel);border:1px solid var(--line);
  transition:border-color .22s ease,box-shadow .22s ease;
}
.frame img,.frame svg{display:block;width:100%;height:100%;object-fit:cover}
.frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;
  background:repeating-linear-gradient(0deg,rgba(7,17,31,.3) 0 1px,transparent 1px 3px);
  mix-blend-mode:multiply;
}
.frame::before{
  content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background:radial-gradient(120% 90% at 82% 0%,rgba(55,242,214,.16),transparent 62%);
  mix-blend-mode:screen;
}
.frame--wide{aspect-ratio:16/9}
.frame--tall{aspect-ratio:3/4}
.frame--square{aspect-ratio:1/1}
.frame:hover{
  border-color:rgba(55,242,214,.6);
  box-shadow:0 0 0 1px rgba(55,242,214,.22),0 18px 40px -26px rgba(55,242,214,.6);
}

/* ---------- breadcrumb ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--silver);
}
.breadcrumb a{color:var(--silver);border-bottom:1px solid transparent;transition:color .18s,border-color .18s}
.breadcrumb a:hover,.breadcrumb a:focus-visible{color:var(--cyan);border-bottom-color:var(--cyan)}
.breadcrumb__sep{color:rgba(28,51,80,.95)}
.breadcrumb [aria-current="page"]{color:var(--paper)}

/* ---------- tabs ---------- */
.tabs__list{
  display:flex;flex-wrap:wrap;gap:8px;
  padding-bottom:14px;border-bottom:1px solid var(--line);
}
.tab{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;
  padding:10px 14px;border:1px solid var(--line);
  background:rgba(13,27,46,.7);color:var(--silver);cursor:pointer;
  transition:color .18s,border-color .18s,background .18s;
}
.tab:hover{color:var(--paper);border-color:var(--silver)}
.tab[aria-selected="true"]{background:var(--cyan);border-color:var(--cyan);color:#04121B}
.tab-panel{margin-top:clamp(18px,2.6vw,28px);animation:tab-in .22s ease both}
.tab-panel[hidden]{display:none}
@keyframes tab-in{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* ---------- reveal ---------- */
[data-reveal]{opacity:0;transform:translateY(14px);transition:opacity .5s ease,transform .5s ease}
[data-reveal].is-visible{opacity:1;transform:none}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;top:8px;left:50%;z-index:300;
  transform:translate(-50%,-180%);
  background:var(--cyan);color:#04121B;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;
  padding:10px 18px;text-decoration:none;
  transition:transform .18s ease;
}
.skip-link:focus-visible{transform:translate(-50%,0);outline:2px solid var(--ink);outline-offset:2px}

/* ================= HEADER ================= */
.site-header{
  position:sticky;top:0;z-index:100;
  background:linear-gradient(180deg,rgba(7,17,31,.985),rgba(9,22,38,.95));
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;pointer-events:none;
  background:linear-gradient(90deg,transparent,rgba(55,242,214,.55) 30%,rgba(255,90,54,.45) 70%,transparent);
}

.header-strip{
  position:relative;overflow:hidden;max-height:64px;
  background:linear-gradient(90deg,rgba(55,242,214,.07),rgba(13,27,46,.24) 45%,rgba(255,90,54,.07));
  border-bottom:1px solid rgba(28,51,80,.85);
  transition:max-height .28s ease,opacity .2s ease;
}
.header-strip::after{
  content:"";position:absolute;top:0;left:-30%;width:22%;height:100%;pointer-events:none;
  background:linear-gradient(90deg,transparent,rgba(55,242,214,.22),transparent);
  animation:strip-sweep 9s linear infinite;
}
@keyframes strip-sweep{0%{left:-30%}100%{left:112%}}
.header-strip__inner{display:flex;align-items:center;gap:12px;padding-block:7px;min-height:32px}
.header-strip__text{
  flex:1;font-family:var(--font-mono);font-size:11px;line-height:1.4;
  letter-spacing:.14em;color:var(--silver);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.status-dot{
  flex:none;width:7px;height:7px;border-radius:50%;
  background:var(--green);box-shadow:0 0 0 3px rgba(61,220,151,.14);
  animation:dot-pulse 2.6s ease-in-out infinite;
}
.status-dot--accent{background:var(--orange);box-shadow:0 0 0 3px rgba(255,90,54,.16)}
@keyframes dot-pulse{0%,100%{opacity:1}50%{opacity:.42}}

.utility{display:flex;align-items:center;gap:clamp(10px,1.6vw,20px);flex:none}
.utility__link{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  color:var(--silver);padding-block:2px;border-bottom:1px solid transparent;
  transition:color .18s,border-color .18s;
}
.utility__link:hover,.utility__link:focus-visible{color:var(--cyan);border-bottom-color:var(--cyan)}
.utility__lang{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  color:var(--cyan);border:1px solid rgba(55,242,214,.4);padding:2px 7px;line-height:1.3;
}

.masthead{
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;
  gap:clamp(12px,3vw,32px);
  padding-block:clamp(12px,2.2vw,22px);
  max-height:180px;overflow:hidden;
  transition:max-height .28s ease,opacity .2s ease,padding .28s ease;
}
.masthead__tag{
  font-family:var(--font-mono);font-size:11px;line-height:1.5;letter-spacing:.2em;
  color:var(--silver);border-left:2px solid var(--cyan);padding-left:10px;
  text-transform:uppercase;
}
.masthead__brand{
  justify-self:center;display:inline-flex;align-items:baseline;gap:.18em;
  font-family:var(--font-display);font-weight:800;
  font-size:clamp(26px,4.6vw,46px);letter-spacing:.14em;line-height:1;
  color:var(--paper);text-decoration:none;padding-block:4px;
  transition:color .18s ease;
}
.masthead__brand:hover{color:#fff}
.masthead__mark{color:var(--cyan);font-size:.62em;letter-spacing:.22em;padding-bottom:.08em}
.masthead__cta{justify-self:end}

.site-header[data-scrolled="true"] .masthead{max-height:0;opacity:0;padding-block:0}
.site-header[data-scrolled="true"] .header-strip{max-height:0;opacity:0;border-bottom-color:transparent}

.header-bar{border-top:1px solid rgba(28,51,80,.9);position:relative}
.header-bar__inner{
  position:relative;display:flex;align-items:center;justify-content:center;
  gap:20px;min-height:54px;
}
.header-bar__brand{
  display:none;align-items:baseline;gap:.2em;
  font-family:var(--font-display);font-weight:800;font-size:16px;
  letter-spacing:.1em;color:var(--paper);text-decoration:none;white-space:nowrap;
}
.header-bar__brand span{color:var(--cyan)}
.header-bar__meta{
  position:absolute;right:0;top:50%;transform:translateY(-50%);
  font-size:10px;letter-spacing:.22em;color:rgba(168,179,194,.62);
}

.primary-nav{flex:1;display:flex;justify-content:center}
.nav-list{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:clamp(6px,2vw,28px)}
.nav-list__item{position:relative}
.nav-link{
  position:relative;display:inline-flex;align-items:baseline;gap:6px;
  padding:16px 2px;color:var(--paper);
  font-size:clamp(12px,1.15vw,14px);letter-spacing:.14em;text-decoration:none;
  transition:color .18s ease;
}
.nav-link__idx{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.04em;
  color:rgba(55,242,214,.7);transition:color .18s ease;
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:10px;height:2px;
  background:var(--cyan);transform:scaleX(0);transform-origin:left center;
  transition:transform .22s ease;
}
.nav-link:hover,.nav-link:focus-visible{color:var(--cyan)}
.nav-link:hover::after,.nav-link:focus-visible::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--cyan)}
.nav-link[aria-current="page"]::after{transform:scaleX(1);background:var(--orange)}
.nav-link[aria-current="page"] .nav-link__idx{color:var(--orange)}

.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:9px 12px;border:1px solid var(--line);
  background:rgba(13,27,46,.9);color:var(--paper);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;cursor:pointer;
  transition:color .18s,border-color .18s;
}
.nav-toggle:hover,.nav-toggle:focus-visible{color:var(--cyan);border-color:var(--cyan)}
.nav-toggle__box{display:grid;gap:4px;width:18px}
.nav-toggle__bar{display:block;height:2px;background:currentColor;transition:transform .2s ease,opacity .15s ease}
.nav-toggle__label{line-height:1}
.site-header[data-open="true"] .nav-toggle__bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
.site-header[data-open="true"] .nav-toggle__bar:nth-child(2){opacity:0}
.site-header[data-open="true"] .nav-toggle__bar:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.scroll-meter{
  position:absolute;left:0;right:0;bottom:0;height:2px;
  background:rgba(28,51,80,.7);overflow:hidden;
}
.scroll-meter__bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:left center;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
}

.mobile-dock{display:none}
@keyframes nav-drop{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}

@media (max-width:1079px){
  .header-bar__meta{display:none}
}
@media (min-width:900px){
  .header-bar__brand{position:absolute;left:0;top:50%;transform:translateY(-50%)}
  .site-header[data-scrolled="true"] .header-bar__brand{display:inline-flex}
}
@media (max-width:899px){
  .utility{display:none}
  .masthead{grid-template-columns:1fr auto;gap:12px}
  .masthead__tag{display:none}
  .masthead__cta{font-size:10px;padding:9px 12px;letter-spacing:.12em}
  .nav-toggle{display:inline-flex}
  .header-bar__brand{display:inline-flex}
  .header-bar__inner{justify-content:space-between;flex-wrap:wrap;gap:12px;min-height:52px;padding-block:4px}
  .primary-nav{display:none;flex:0 0 100%;order:3;justify-content:flex-start}
  .site-header[data-open="true"] .primary-nav{display:block;animation:nav-drop .18s ease both}
  .nav-list{flex-direction:column;align-items:stretch;gap:0;padding-bottom:6px}
  .nav-list__item{border-top:1px solid rgba(28,51,80,.75)}
  .nav-link{display:flex;justify-content:space-between;align-items:center;padding:14px 2px;font-size:15px;letter-spacing:.1em}
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{padding-left:10px;border-left:2px solid var(--orange)}
}
@media (max-width:599px){
  body{padding-bottom:62px}
  .mobile-dock{
    display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
    position:fixed;left:0;right:0;bottom:0;z-index:90;
    background:rgba(9,20,34,.97);border-top:1px solid var(--line);
    backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
  }
  .mobile-dock__link{
    display:flex;flex-direction:column;align-items:center;gap:3px;
    padding:9px 2px 8px;color:var(--silver);
    font-size:11px;letter-spacing:.06em;text-decoration:none;
    border-right:1px solid rgba(28,51,80,.7);
  }
  .mobile-dock__link:last-child{border-right:0}
  .mobile-dock__link[aria-current="page"]{color:var(--cyan);background:rgba(55,242,214,.07)}
  .mobile-dock__idx{font-family:var(--font-mono);font-size:9px;letter-spacing:.14em;color:rgba(55,242,214,.65)}
}

/* ================= FOOTER ================= */
.site-footer{
  position:relative;overflow:hidden;
  background:var(--panel);border-top:1px solid var(--line);
  margin-top:clamp(56px,8vw,110px);
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;
  background-image:
    repeating-linear-gradient(90deg,rgba(28,51,80,.5) 0 1px,transparent 1px 72px),
    repeating-linear-gradient(0deg,rgba(28,51,80,.34) 0 1px,transparent 1px 72px);
}
.site-footer::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:180px;pointer-events:none;
  background:
    radial-gradient(70% 120% at 12% 100%,rgba(55,242,214,.14),transparent 70%),
    radial-gradient(60% 100% at 88% 100%,rgba(255,90,54,.12),transparent 70%);
}
.footer-diag{
  position:absolute;top:0;left:0;z-index:1;
  width:min(420px,64%);height:5px;
  background:linear-gradient(90deg,var(--orange),var(--cyan));
  clip-path:polygon(0 0,100% 0,calc(100% - 44px) 100%,0 100%);
}
.footer-top{
  position:relative;z-index:2;
  display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1.6fr);
  gap:clamp(28px,5vw,64px);
  padding-block:clamp(38px,5.4vw,68px) clamp(24px,3.4vw,40px);
}
.footer-brand__mark{
  display:inline-block;font-family:var(--font-display);font-weight:800;
  font-size:clamp(22px,2.6vw,32px);letter-spacing:.14em;
  color:var(--paper);text-decoration:none;transition:color .18s;
}
.footer-brand__mark:hover,.footer-brand__mark:focus-visible{color:var(--cyan)}
.footer-brand__line{margin-top:12px;font-size:14px;line-height:1.7;color:var(--silver);max-width:34ch}
.footer-contact{margin-top:22px;display:grid;gap:10px}
.footer-contact__row{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.footer-contact__label{
  min-width:44px;font-family:var(--font-mono);font-size:10px;
  letter-spacing:.2em;color:rgba(168,179,194,.75);
}
.footer-contact__value{color:var(--paper);font-family:var(--font-mono);font-size:13px;letter-spacing:.04em;word-break:break-all}
.copy-btn{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.14em;
  padding:2px 7px;border:1px solid var(--line);color:var(--silver);cursor:pointer;
  transition:color .18s,border-color .18s;
}
.copy-btn:hover,.copy-btn:focus-visible{color:var(--cyan);border-color:var(--cyan)}
.copy-btn[data-copied="true"]{color:var(--green);border-color:var(--green)}
.footer-status{
  min-height:16px;margin-top:6px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--cyan);
}
.footer-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(18px,3vw,32px)}
.footer-col__title{
  font-family:var(--font-mono);font-size:11px;font-weight:400;
  letter-spacing:.2em;color:var(--cyan);
  padding-bottom:10px;margin-bottom:14px;border-bottom:1px solid var(--line);
}
.footer-list{display:grid;gap:10px}
.footer-link{color:var(--silver);font-size:14px;transition:color .18s,padding-left .18s}
.footer-link:hover,.footer-link:focus-visible{color:var(--paper);padding-left:4px}
.footer-base{
  position:relative;z-index:2;
  display:flex;align-items:center;justify-content:space-between;
  gap:12px;flex-wrap:wrap;
  padding-block:18px 26px;border-top:1px solid var(--line);
}
.footer-base__note{font-size:12px;color:var(--silver)}
.footer-base__meta{
  display:flex;align-items:center;gap:clamp(10px,2vw,22px);flex-wrap:wrap;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:rgba(168,179,194,.8);
}
.footer-icp{color:rgba(168,179,194,.8)}

@media (max-width:899px){
  .footer-top{grid-template-columns:1fr}
}
@media (max-width:599px){
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-base{flex-direction:column;align-items:flex-start}
}

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