/* ========== 00 RESET ========== */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,dl,dt,dd,figure,blockquote,fieldset{margin:0;padding:0;}
ul,ol{list-style:none;}
img,svg,video{max-width:100%;display:block;}
button,input,select,textarea{font:inherit;color:inherit;background:none;border:0;}
h1,h2,h3,h4,h5,h6{font-weight:inherit;font-size:inherit;}
table{border-collapse:collapse;width:100%;}

/* ========== 01 TOKENS ========== */
:root{
  --ink:#0A1220;
  --ink-deep:#060C16;
  --tactic:#123A6B;
  --brand-blue:#1B4F9C;
  --electric:#2FE3D0;
  --deep-teal:#0A6B63;
  --gold:#F2B441;
  --card:#F4F7FB;
  --text:#0B0F16;
  --muted:#6B7A90;
  --line:#C9D6E4;
  --white:#FFFFFF;

  --line-dark:rgba(150,190,235,.18);
  --line-dark-strong:rgba(150,190,235,.34);
  --text-on-dark:#D8E3F0;
  --text-on-dark-dim:#8CA2BA;

  --f-display:"Arial Narrow","Helvetica Neue",Impact,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --f-body:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  --f-mono:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,"Courier New",monospace;

  --w-max:1400px;
  --pad:clamp(16px,4vw,48px);
  --gap:clamp(16px,2vw,26px);
  --sp:clamp(28px,5vw,72px);
  --r:0px;
}

/* ========== 02 BASE ========== */
html{scroll-behavior:smooth;}
body{
  font-family:var(--f-body);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  color:var(--text-on-dark);
  background:var(--ink);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}
body::selection,.panel--light ::selection{background:var(--electric);color:var(--ink);}
p+p{margin-top:1em;}
a{color:var(--electric);text-decoration:none;transition:color .18s ease;}
a:hover{text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px;}
strong,b{font-weight:700;color:var(--white);}
img{height:auto;}
hr{border:0;border-top:1px solid var(--line-dark);margin:var(--gap) 0;}
:focus-visible{outline:2px solid var(--electric);outline-offset:3px;}

h1,h2,h3{font-family:var(--f-display);font-weight:800;line-height:1.08;letter-spacing:-.01em;color:var(--white);}

/* ========== 03 SKIP LINK ========== */
.skip-link{
  position:fixed;top:0;left:0;z-index:200;
  padding:12px 20px;
  background:var(--electric);color:var(--ink);
  font-family:var(--f-mono);font-size:13px;font-weight:700;letter-spacing:.1em;
  transform:translateY(-130%);
  transition:transform .2s ease;
}
.skip-link:focus{transform:translateY(0);outline:none;text-decoration:none;}

/* ========== 04 HEADER ========== */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(10,18,32,.94);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  color:var(--text-on-dark);
  border-bottom:1px solid var(--line-dark-strong);
  transition:background-color .2s ease,border-color .2s ease;
}
.site-header.is-scrolled{
  background:rgba(6,12,22,.985);
  border-bottom-color:rgba(47,227,208,.45);
}
.scroll-progress{
  position:absolute;left:0;right:0;bottom:0;height:2px;
  pointer-events:none;overflow:hidden;
}
.scroll-progress>span{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:left center;
  background:linear-gradient(90deg,var(--electric),var(--gold));
}
.header-frame{
  display:grid;
  grid-template-columns:auto 1fr auto;
  align-items:stretch;
  max-width:var(--w-max);
  margin-inline:auto;
  padding-inline:var(--pad);
  border-inline:1px solid var(--line-dark);
  min-height:76px;
}

/* brand lock */
.brand-lock{grid-column:1;grid-row:1;display:flex;align-items:center;gap:10px;padding-right:22px;}
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--white);text-decoration:none;}
.brand:hover{text-decoration:none;color:var(--white);}
.brand-mark{
  position:relative;flex:none;width:24px;height:24px;
  background:linear-gradient(135deg,var(--brand-blue) 0 48%,var(--ink-deep) 48% 100%);
  border:1px solid rgba(150,195,255,.55);
}
.brand-mark::after{content:"";position:absolute;inset:7px;background:var(--electric);}
.brand-text{
  font-family:var(--f-display);
  font-size:17px;font-weight:800;letter-spacing:.05em;line-height:1;
}
.status-dot{
  flex:none;width:6px;height:6px;border-radius:50%;
  background:var(--electric);
  box-shadow:0 0 0 3px rgba(47,227,208,.16);
  margin-left:4px;
}
.status-label{
  font-family:var(--f-mono);font-size:10px;letter-spacing:.18em;
  color:var(--electric);white-space:nowrap;
}

/* nav */
.site-nav{grid-column:2;grid-row:1;display:flex;align-items:stretch;min-width:0;}
.nav-group{
  display:flex;flex-direction:column;justify-content:center;gap:4px;
  padding:12px 18px;
  border-left:1px solid var(--line-dark);
  min-width:0;
}
.nav-group-label{
  font-family:var(--f-mono);font-size:10px;letter-spacing:.16em;
  color:var(--text-on-dark-dim);line-height:1;white-space:nowrap;
}
.nav-group-links{display:flex;flex-wrap:wrap;align-items:center;gap:14px;}
.nav-group-links a{
  position:relative;
  font-size:13.5px;font-weight:500;line-height:1.3;
  color:var(--text-on-dark);
  padding-bottom:3px;
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
  white-space:nowrap;
}
.nav-group-links a:hover{color:var(--electric);border-bottom-color:var(--electric);text-decoration:none;}
.nav-group-links a[aria-current="page"]{color:var(--electric);border-bottom-color:var(--electric);}
.nav-group-links a[aria-current="page"]::before{
  content:"";position:absolute;left:-8px;top:50%;width:3px;height:3px;
  background:var(--gold);transform:translateY(-50%);
}

/* header actions */
.header-actions{
  grid-column:3;grid-row:1;
  display:flex;align-items:center;gap:10px;
  padding-left:22px;
  border-left:1px solid var(--line-dark);
}

/* nav toggle */
.nav-toggle{
  display:none;
  align-items:center;gap:9px;
  padding:9px 13px;
  border:1px solid var(--line-dark-strong);
  color:var(--text-on-dark);
  font-family:var(--f-mono);font-size:11px;letter-spacing:.16em;
  cursor:pointer;
  transition:color .18s ease,border-color .18s ease;
}
.nav-toggle:hover,.nav-toggle:focus-visible{border-color:var(--electric);color:var(--electric);}
.nav-toggle-label{line-height:1;}
.nav-toggle-bars{position:relative;flex:none;width:16px;height:12px;}
.nav-toggle-bars::before{
  content:"";position:absolute;left:0;right:0;top:0;height:2px;
  background:currentColor;
  box-shadow:0 5px 0 currentColor,0 10px 0 currentColor;
}
.site-header[data-open] .nav-toggle{border-color:var(--electric);color:var(--electric);}
.site-header[data-open] .nav-toggle-bars::before{
  height:2px;top:5px;box-shadow:none;transform:rotate(45deg);
  background:currentColor;
}
.site-header[data-open] .nav-toggle-bars::after{
  content:"";position:absolute;left:0;right:0;top:5px;height:2px;
  background:currentColor;transform:rotate(-45deg);
}

/* ========== 05 BUTTONS ========== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:9px 16px;
  font-family:var(--f-body);font-size:13px;font-weight:600;line-height:1.15;
  letter-spacing:.04em;
  border:1px solid transparent;
  border-radius:var(--r);
  background:transparent;
  color:var(--text-on-dark);
  cursor:pointer;
  text-decoration:none;
  transition:color .18s ease,border-color .18s ease,background-color .18s ease;
}
.btn:hover{text-decoration:none;}
.btn-ghost{border-color:var(--line-dark-strong);color:var(--text-on-dark);}
.btn-ghost:hover{border-color:var(--electric);color:var(--electric);}
.btn-gold{border-color:var(--gold);color:var(--gold);}
.btn-gold:hover{background:var(--gold);color:var(--ink);border-color:var(--gold);}
.btn-solid{background:var(--electric);border-color:var(--electric);color:var(--ink);}
.btn-solid:hover{background:transparent;color:var(--electric);}
.btn-dark{background:var(--ink);border-color:var(--ink);color:var(--white);}
.btn-dark:hover{background:transparent;color:var(--ink);}
.btn-teal{border-color:var(--deep-teal);color:var(--deep-teal);}
.btn-teal:hover{background:var(--deep-teal);color:var(--white);}

/* ========== 06 LAYOUT ========== */
.container{
  width:100%;max-width:var(--w-max);
  margin-inline:auto;
  padding-inline:var(--pad);
}
.container--narrow{max-width:920px;}

.grid{display:grid;gap:var(--gap);}
.grid-12{grid-template-columns:repeat(12,1fr);}
.col-3{grid-column:span 3;}
.col-4{grid-column:span 4;}
.col-5{grid-column:span 5;}
.col-6{grid-column:span 6;}
.col-7{grid-column:span 7;}
.col-8{grid-column:span 8;}
.col-9{grid-column:span 9;}
.col-12{grid-column:span 12;}

/* ========== 07 PANELS ========== */
.panel{
  position:relative;
  background:var(--ink);
  color:var(--text-on-dark);
  border:1px solid var(--line-dark-strong);
  padding:clamp(20px,3vw,40px);
  border-radius:var(--r);
}
.panel--tactic{background:var(--tactic);border-color:var(--line-dark);}
.panel--light{background:var(--card);color:var(--text);border-color:var(--line);}
.panel--light h1,.panel--light h2,.panel--light h3,.panel--light strong{color:var(--text);}
.panel--light a{color:var(--deep-teal);}
.panel--light .panel-index{color:var(--deep-teal);}
.panel--light .mono{color:var(--muted);}
.panel--light :focus-visible{outline-color:var(--deep-teal);}
.panel--line{border:0;border-top:1px solid var(--line-dark-strong);padding-inline:0;padding-bottom:0;}
.panel-index{
  display:block;
  font-family:var(--f-mono);font-size:12px;letter-spacing:.2em;
  color:var(--electric);
  margin-bottom:12px;
}
.panel-title{
  font-family:var(--f-display);font-weight:800;
  font-size:clamp(22px,2.8vw,34px);line-height:1.12;
  margin-bottom:10px;
}
.section--light{background:var(--card);color:var(--text);}
.section--light h1,.section--light h2,.section--light h3{color:var(--text);}
.section--light a{color:var(--deep-teal);}

/* ========== 08 TEXT UTILITIES ========== */
.mono{font-family:var(--f-mono);font-size:12px;letter-spacing:.09em;color:var(--text-on-dark-dim);}
.eyebrow{
  display:inline-block;
  font-family:var(--f-mono);font-size:11px;letter-spacing:.22em;
  color:var(--electric);text-transform:uppercase;
}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 9px;
  font-family:var(--f-mono);font-size:11px;letter-spacing:.14em;line-height:1.4;
  border:1px solid var(--line-dark-strong);
  color:var(--text-on-dark-dim);
}
.tag--electric{border-color:var(--electric);color:var(--electric);}
.tag--gold{border-color:var(--gold);color:var(--gold);}
.tag--light{border-color:var(--line);background:var(--white);color:var(--muted);}

/* ========== 09 BREADCRUMB ========== */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding:16px 0;
  font-family:var(--f-mono);font-size:12px;letter-spacing:.07em;
  color:var(--text-on-dark-dim);
}
.breadcrumb li{display:flex;align-items:center;gap:8px;}
.breadcrumb li+li::before{content:"/";color:var(--line-dark-strong);}
.breadcrumb a{color:var(--text-on-dark-dim);}
.breadcrumb a:hover{color:var(--electric);text-decoration:none;}
.breadcrumb [aria-current="page"]{color:var(--electric);}
.breadcrumb--light{color:var(--muted);}
.breadcrumb--light a{color:var(--muted);}
.breadcrumb--light a:hover{color:var(--deep-teal);}
.breadcrumb--light [aria-current="page"]{color:var(--deep-teal);}
.breadcrumb--light li+li::before{color:var(--line);}

/* ========== 10 MEDIA FRAMES ========== */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:16/10;
  border:1px solid var(--line-dark-strong);
  background:linear-gradient(150deg,var(--tactic) 0%,var(--ink) 62%,var(--ink-deep) 100%);
}
.media-frame>img{width:100%;height:100%;object-fit:cover;display:block;}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    repeating-linear-gradient(0deg,rgba(255,255,255,.055) 0 1px,transparent 1px 32px),
    repeating-linear-gradient(90deg,rgba(255,255,255,.055) 0 1px,transparent 1px 32px);
}
.media-frame--wide{aspect-ratio:21/9;}
.media-frame--tall{aspect-ratio:4/5;}
.media-frame--square{aspect-ratio:1/1;}
.media-frame--light{border-color:var(--line);background:linear-gradient(150deg,#E6EEF8 0%,var(--card) 70%);}
.media-frame--light::after{
  background-image:
    repeating-linear-gradient(0deg,rgba(11,15,22,.05) 0 1px,transparent 1px 32px),
    repeating-linear-gradient(90deg,rgba(11,15,22,.05) 0 1px,transparent 1px 32px);
}
.media-frame figcaption{
  position:absolute;left:0;bottom:0;right:0;
  padding:10px 12px;
  font-family:var(--f-mono);font-size:11px;letter-spacing:.12em;
  color:var(--text-on-dark-dim);
  background:linear-gradient(180deg,transparent,rgba(6,12,22,.82));
}

/* ========== 11 FOOTER ========== */
.site-footer{
  position:relative;
  background:var(--ink-deep);
  color:var(--text-on-dark);
  border-top:1px solid var(--line-dark-strong);
}
.footer-ruler{
  height:14px;
  border-bottom:1px solid var(--line-dark);
  background-image:repeating-linear-gradient(90deg,var(--line-dark-strong) 0 1px,transparent 1px 26px);
  opacity:.85;
}
.footer-inner{
  max-width:var(--w-max);
  margin-inline:auto;
  padding:clamp(26px,4vw,48px) var(--pad) 0;
}
.footer-masthead{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px;
  padding-bottom:clamp(18px,3vw,28px);
  border-bottom:1px solid var(--line-dark);
  margin-bottom:clamp(22px,3vw,38px);
}
.footer-brand{color:var(--white);}
.footer-build{
  font-family:var(--f-mono);font-size:11px;letter-spacing:.16em;
  color:var(--text-on-dark-dim);
}
.footer-grid{
  display:grid;
  grid-template-columns:1.1fr .9fr 1.3fr .9fr;
  gap:clamp(20px,3vw,40px);
  padding-bottom:clamp(24px,3.5vw,44px);
}
.footer-col{min-width:0;}
.footer-title{
  font-family:var(--f-mono);font-size:11px;font-weight:500;letter-spacing:.2em;
  color:var(--text-on-dark-dim);
  padding-bottom:10px;margin-bottom:14px;
  border-bottom:1px solid var(--line-dark);
}
.footer-list{display:flex;flex-direction:column;gap:9px;font-size:14px;}
.footer-list a{color:var(--text-on-dark);}
.footer-list a:hover{color:var(--electric);text-decoration:none;}
.footer-list--plain li{
  display:flex;gap:10px;align-items:baseline;
  font-size:13px;line-height:1.7;color:var(--text-on-dark-dim);
}
.footer-list--plain .mono{
  flex:none;min-width:34px;
  color:var(--electric);font-size:10px;letter-spacing:.16em;
}
.footer-note{
  margin-top:16px;padding-left:11px;
  border-left:2px solid var(--gold);
  font-size:12px;line-height:1.7;color:var(--text-on-dark-dim);
}
.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;
  padding:16px 0 22px;
  border-top:1px solid var(--line-dark);
  font-size:12px;color:var(--text-on-dark-dim);
}
.footer-copy{font-size:12px;letter-spacing:.04em;}
.footer-icp{font-size:11px;letter-spacing:.12em;}

/* ========== 12 TO TOP ========== */
.to-top{
  position:fixed;right:clamp(12px,2vw,26px);bottom:clamp(12px,2vw,26px);
  z-index:70;
  display:inline-flex;align-items:center;gap:7px;
  padding:10px 14px;
  font-family:var(--f-mono);font-size:11px;letter-spacing:.16em;
  background:rgba(10,18,32,.93);
  color:var(--electric);
  border:1px solid var(--line-dark-strong);
  cursor:pointer;
  opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity .24s ease,visibility .24s ease,transform .24s ease,border-color .18s ease,color .18s ease;
}
.to-top.is-visible{opacity:1;visibility:visible;transform:none;}
.to-top:hover,.to-top:focus-visible{border-color:var(--gold);color:var(--gold);}

/* ========== 13 REVEAL ========== */
html.js-motion [data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .32s ease,transform .32s ease;
}
html.js-motion [data-reveal].is-in{opacity:1;transform:none;}

/* ========== 14 RESPONSIVE ========== */
@media (max-width:1120px){
  .header-frame{
    grid-template-columns:auto 1fr auto;
    align-items:center;
    min-height:64px;
    padding-block:10px;
    gap:10px;
  }
  .brand-lock{grid-column:1;grid-row:1;padding-right:0;}
  .status-label{display:none;}
  .header-actions{
    grid-column:2;grid-row:1;
    justify-self:end;
    padding-left:0;border-left:0;gap:8px;
  }
  .header-actions .btn-ghost{display:none;}
  .nav-toggle{grid-column:3;grid-row:1;display:inline-flex;justify-self:end;}
  .site-nav{
    grid-column:1 / -1;
    grid-row:2;
    display:none;
    flex-direction:column;
    align-items:stretch;
    border-top:1px solid var(--line-dark);
    margin-inline:calc(var(--pad) * -1);
    padding-inline:var(--pad);
  }
  .site-header[data-open] .site-nav{display:flex;}
  .site-nav .nav-group{
    border-left:0;
    border-top:1px solid var(--line-dark);
    padding:14px 0;
    gap:8px;
    align-items:flex-start;
  }
  .site-nav .nav-group:first-child{border-top:0;}
  .site-nav .nav-group-links{gap:18px;flex-wrap:wrap;}
  .site-nav .nav-group-links a{font-size:15px;}
}

@media (max-width:1024px){
  body{font-size:16px;}
  .grid-12{grid-template-columns:repeat(6,1fr);}
  .col-3,.col-4{grid-column:span 3;}
  .col-5,.col-6,.col-7{grid-column:span 6;}
  .col-8,.col-9,.col-12{grid-column:span 6;}
  .footer-grid{grid-template-columns:repeat(2,1fr);}
}

@media (max-width:640px){
  :root{--pad:18px;}
  body{font-size:15.5px;line-height:1.72;}
  .grid-12{grid-template-columns:1fr;}
  .col-3,.col-4,.col-5,.col-6,.col-7,.col-8,.col-9,.col-12{grid-column:span 1;}
  .brand-text{font-size:15px;}
  .header-actions .btn-gold{padding:8px 12px;font-size:12px;}
  .footer-grid{grid-template-columns:1fr;gap:26px;}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:6px;}
  .to-top{font-size:10px;padding:9px 11px;}
  .breadcrumb{font-size:11px;}
}

/* ========== 15 A11Y / 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;
  }
  html.js-motion [data-reveal]{opacity:1;transform:none;}
  .scroll-progress>span{transition:none;}
}