/* ============ reset ============ */
*,
*::before,
*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse}
[hidden]{display:none!important}

/* ============ tokens ============ */
:root{
  --cyan:#00C2FF;
  --ink:#0A1A2F;
  --amber:#FFB020;
  --ice:#F5F9FF;
  --fog:#DCEBFA;
  --steel:#1E3A5F;
  --teal:#0F7FA8;
  --slate:#6B7C93;
  --black:#101820;
  --mint:#E8FFF9;
  --white:#FFFFFF;
  --border:2px solid var(--black);
  --shadow-hard:6px 6px 0 var(--black);
  --shadow-soft:4px 4px 0 rgba(16,24,32,.18);
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
  --wrap:1180px;
  --gutter:clamp(16px,4vw,40px);
}

/* ============ base ============ */
body{
  background:var(--ice);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
::selection{background:var(--cyan);color:var(--ink)}
h1,h2,h3,h4,h5{font-weight:800;line-height:1.22;letter-spacing:-.01em;color:var(--ink)}
h1{font-size:clamp(30px,5.2vw,48px)}
h2{font-size:clamp(24px,3.6vw,32px)}
h3{font-size:clamp(18px,2.4vw,20px)}
h4{font-size:16px}
:focus-visible{outline:3px solid var(--cyan);outline-offset:2px}

/* ============ skip link ============ */
.skip-link{
  position:fixed;
  top:10px;left:10px;
  z-index:300;
  transform:translateY(-220%);
  background:var(--cyan);
  color:var(--ink);
  font-weight:700;
  font-size:14px;
  padding:10px 16px;
  border:var(--border);
  box-shadow:var(--shadow-hard);
  transition:transform .18s ease;
}
.skip-link:focus{transform:translateY(0)}

/* ============ header ============ */
.site-header{
  position:sticky;
  top:0;
  z-index:120;
  background:rgba(10,26,47,.86);
  color:var(--ice);
  border-bottom:2px solid var(--black);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  transition:background .2s ease,box-shadow .2s ease;
}
.site-header[data-scrolled="true"]{
  background:var(--ink);
  box-shadow:0 5px 0 rgba(16,24,32,.32);
}
.site-header :focus-visible{outline-color:var(--amber)}
.header-grid{
  display:flex;
  align-items:center;
  flex-wrap:nowrap;
  gap:16px;
  max-width:var(--wrap);
  margin:0 auto;
  padding:12px var(--gutter) 10px;
}

/* brand */
.brand{display:flex;align-items:center;gap:12px;flex:0 0 auto}
.brand-mark{
  display:grid;
  place-items:center;
  min-width:52px;
  padding:8px 7px;
  background:var(--cyan);
  color:var(--ink);
  border:2px solid #04101f;
  box-shadow:3px 3px 0 var(--teal);
  font-family:var(--font-mono);
  font-size:15px;
  font-weight:700;
  letter-spacing:.04em;
  line-height:1;
}
.brand-copy{display:flex;flex-direction:column;gap:2px}
.brand-name{font-size:17px;font-weight:800;letter-spacing:.02em;line-height:1.15;color:var(--ice)}
.brand-line{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  line-height:1.2;
  color:rgba(0,194,255,.9);
}

/* nav */
.primary-nav{margin-left:auto;min-width:0;max-width:100%}
.nav-list{
  display:flex;
  align-items:stretch;
  gap:2px;
  overflow-x:auto;
  scrollbar-width:none;
  -ms-overflow-style:none;
}
.nav-list::-webkit-scrollbar{display:none}
.nav-item{flex:0 0 auto}
.nav-link{
  display:block;
  padding:10px 12px;
  font-size:14px;
  font-weight:600;
  color:#CFE3F5;
  white-space:nowrap;
  border-bottom:3px solid transparent;
  transition:color .15s ease,background .15s ease,border-color .15s ease;
}
.nav-link:hover{color:var(--white);background:rgba(0,194,255,.12)}
.nav-link[aria-current="page"]{
  color:var(--cyan);
  border-bottom-color:var(--cyan);
  background:rgba(0,194,255,.14);
}

/* nav toggle */
.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  margin-left:auto;
  padding:9px 12px;
  background:transparent;
  color:var(--ice);
  border:2px solid rgba(245,249,255,.55);
  box-shadow:3px 3px 0 rgba(0,194,255,.55);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  cursor:pointer;
  transition:background .15s ease,color .15s ease,border-color .15s ease;
}
.nav-toggle:hover{background:rgba(0,194,255,.16)}
.nav-toggle[aria-expanded="true"]{
  background:var(--cyan);
  color:var(--ink);
  border-color:var(--black);
  box-shadow:3px 3px 0 var(--black);
}
.nav-toggle-icon{
  width:16px;
  height:2px;
  background:currentColor;
  box-shadow:0 -5px 0 currentColor,0 5px 0 currentColor;
}
.nav-toggle-label{line-height:1}

/* search bar */
.search-bar{
  display:flex;
  align-items:center;
  gap:10px;
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 var(--gutter) 12px;
}
.search-label{
  flex:0 0 auto;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--cyan);
  border:1px solid rgba(0,194,255,.55);
  padding:5px 8px;
  line-height:1;
}
.search-field{
  display:flex;
  align-items:center;
  gap:10px;
  flex:1 1 auto;
  min-width:0;
}
.search-input{
  flex:1 1 auto;
  min-width:0;
  width:100%;
  padding:9px 12px;
  background:rgba(245,249,255,.08);
  border:2px solid rgba(245,249,255,.24);
  color:var(--ice);
  font-size:14px;
  line-height:1.4;
  outline:none;
  -webkit-appearance:none;
  appearance:none;
  transition:border-color .15s ease,background .15s ease,box-shadow .15s ease;
}
.search-input::placeholder{color:rgba(245,249,255,.52)}
.search-input:focus{
  border-color:var(--cyan);
  background:rgba(0,194,255,.12);
  box-shadow:0 0 0 3px rgba(0,194,255,.2);
}
.search-hint{
  flex:0 0 auto;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--amber);
  white-space:nowrap;
  min-height:1em;
}

/* progress */
.scroll-progress{
  position:absolute;
  left:0;
  bottom:-2px;
  width:100%;
  height:3px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform .1s linear;
}

/* ============ layout ============ */
.wrap{
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 var(--gutter);
}
.page-head{padding:32px 0 8px}
.eyebrow{
  display:inline-block;
  margin-bottom:12px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--teal);
}
.lede{
  margin-top:14px;
  font-size:17px;
  line-height:1.7;
  color:var(--steel);
  max-width:64ch;
}
.prose{font-size:16px;line-height:1.75;color:var(--ink)}
.prose p{max-width:72ch}
.prose p + p{margin-top:14px}
.prose a{
  color:var(--teal);
  text-decoration:underline;
  text-decoration-style:dashed;
  text-decoration-color:rgba(0,194,255,.85);
  text-underline-offset:3px;
}
.prose a:hover{color:var(--cyan)}
.mono{font-family:var(--font-mono);font-size:.92em;letter-spacing:.04em}
.index-num{
  display:inline-block;
  padding:2px 8px;
  background:var(--ink);
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.08em;
  line-height:1.5;
}

/* ============ breadcrumb ============ */
.breadcrumb{
  max-width:var(--wrap);
  margin:0 auto;
  padding:18px var(--gutter) 0;
}
.breadcrumb-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--slate);
}
.breadcrumb-item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb-item + .breadcrumb-item::before{content:"/";color:#9DB4CC}
.breadcrumb-item a{
  color:var(--steel);
  text-decoration:none;
  border-bottom:1px dashed rgba(30,58,95,.45);
}
.breadcrumb-item a:hover{color:var(--teal);border-bottom-color:var(--cyan)}
.breadcrumb-current{color:var(--ink);font-weight:700}

/* ============ buttons ============ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 20px;
  border:var(--border);
  background:var(--ice);
  color:var(--ink);
  font-size:15px;
  font-weight:700;
  line-height:1.2;
  text-decoration:none;
  box-shadow:var(--shadow-hard);
  cursor:pointer;
  transition:transform .15s ease,box-shadow .15s ease,background .15s ease;
}
.btn:hover{transform:translate(-2px,-2px);box-shadow:8px 8px 0 var(--black)}
.btn:active{transform:translate(2px,2px);box-shadow:2px 2px 0 var(--black)}
.btn--primary{background:var(--cyan)}
.btn--amber{background:var(--amber)}
.btn--ghost{background:transparent}
.btn--sm{padding:8px 14px;font-size:13px;box-shadow:4px 4px 0 var(--black)}
.btn--sm:hover{box-shadow:6px 6px 0 var(--black)}

/* ============ cards & tags ============ */
.card{
  display:flex;
  flex-direction:column;
  gap:10px;
  padding:20px;
  background:var(--white);
  border:var(--border);
  box-shadow:var(--shadow-hard);
  transition:transform .15s ease,box-shadow .15s ease;
}
.card:hover{transform:translate(-2px,-3px);box-shadow:8px 8px 0 var(--black)}
.card-head{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:12px;
  flex-wrap:wrap;
}
.card-title{font-size:20px;font-weight:800;line-height:1.3}
.card-meta{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--slate);
}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 8px;
  border:1px solid var(--steel);
  background:var(--fog);
  color:var(--steel);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  line-height:1.5;
}
.tag--cyan{background:var(--cyan);border-color:var(--black);color:var(--ink)}
.tag--amber{background:var(--amber);border-color:var(--black);color:var(--ink)}
.tag--mono{background:transparent;border-color:var(--slate);color:var(--slate)}

/* ============ grids ============ */
.grid{display:grid;gap:20px}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.split{
  display:grid;
  grid-template-columns:minmax(0,1.65fr) minmax(0,1fr);
  gap:32px;
  align-items:start;
}

/* ============ media ============ */
.media-figure{margin:0}
.media-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16/10;
  background:var(--fog);
  border:var(--border);
  box-shadow:var(--shadow-hard);
}
.media-frame > img,
.media-frame > picture > img,
.media-frame > svg,
.media-frame > video{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame--paper{
  background-color:var(--fog);
  background-image:
    linear-gradient(rgba(30,58,95,.13) 1px,transparent 1px),
    linear-gradient(90deg,rgba(30,58,95,.13) 1px,transparent 1px);
  background-size:24px 24px;
}
.media-caption{
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--slate);
}

/* ============ callout ============ */
.callout{
  padding:16px 18px;
  background:var(--ice);
  border:var(--border);
  border-left:8px solid var(--cyan);
  box-shadow:var(--shadow-soft);
  font-size:15px;
  line-height:1.7;
}
.callout--amber{background:#FFF7E6;border-left-color:var(--amber)}
.callout--mint{background:var(--mint);border-left-color:var(--teal)}

/* ============ table ============ */
.table-scroll{
  overflow-x:auto;
  background:var(--white);
  border:var(--border);
  box-shadow:var(--shadow-hard);
}
.data-table{width:100%;min-width:560px;font-size:14px}
.data-table th,
.data-table td{
  padding:10px 14px;
  text-align:left;
  border-bottom:1px solid var(--fog);
  vertical-align:top;
}
.data-table thead th{
  background:var(--fog);
  color:var(--steel);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:700;
  letter-spacing:.1em;
  border-bottom:2px solid var(--steel);
}
.data-table tbody tr:last-child td{border-bottom:0}
.data-table tbody tr:hover{background:var(--mint)}

/* ============ util ============ */
.is-hidden{display:none!important}

/* ============ footer ============ */
.site-footer{
  margin-top:72px;
  background:var(--ink);
  color:#D8E6F4;
  border-top:4px solid var(--cyan);
}
.footer-inner{
  display:grid;
  grid-template-columns:1.6fr repeat(3,minmax(0,1fr));
  gap:32px;
  max-width:var(--wrap);
  margin:0 auto;
  padding:48px var(--gutter) 36px;
}
.footer-lead{display:flex;flex-direction:column;align-items:flex-start;gap:12px}
.footer-kicker{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--cyan);
  line-height:1.5;
}
.footer-title{
  font-size:24px;
  font-weight:800;
  line-height:1.25;
  color:var(--white);
}
.footer-note{font-size:13px;line-height:1.7;color:#A9C1D8;max-width:32ch}
.footer-col{min-width:0}
.footer-col-title{
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:700;
  letter-spacing:.16em;
  color:var(--cyan);
  line-height:1.4;
}
.footer-list{display:grid;gap:10px}
.footer-link{
  display:inline-block;
  font-size:14px;
  color:#CFE3F5;
  border-bottom:1px dashed rgba(0,194,255,.5);
  padding-bottom:1px;
  transition:color .15s ease,border-color .15s ease;
}
.footer-link:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.footer-link--sm{font-size:12px}
.footer-contact-item{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:4px 8px;
  font-size:13px;
  line-height:1.55;
  color:#B9CEE4;
}
.footer-mono{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--cyan);
  line-height:1.5;
}
.copy-btn{
  padding:2px 8px;
  background:transparent;
  border:1px solid rgba(0,194,255,.55);
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  line-height:1.6;
  cursor:pointer;
  transition:background .15s ease,color .15s ease,border-color .15s ease;
}
.copy-btn:hover,
.copy-btn[data-copied="true"]{background:var(--cyan);color:var(--ink);border-color:var(--cyan)}
.footer-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 28px;
  max-width:var(--wrap);
  margin:0 auto;
  padding:20px var(--gutter) 40px;
  border-top:1px solid rgba(0,194,255,.28);
}
.footer-legal{font-size:12px;line-height:1.7;color:#8FA7C0}
.footer-copy{
  margin-top:4px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:#8FA7C0;
}
.footer-legal-nav{display:flex;flex-wrap:wrap;gap:8px 18px;align-items:center}

/* ============ responsive ============ */
@media (max-width:1024px){
  .footer-inner{grid-template-columns:1fr 1fr;gap:28px}
  .footer-lead{grid-column:1 / -1}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .split{grid-template-columns:minmax(0,1fr);gap:24px}
}

@media (max-width:860px){
  .header-grid{flex-wrap:wrap;padding-bottom:8px}
  .nav-toggle{display:inline-flex}
  .primary-nav{
    display:none;
    order:3;
    width:100%;
    margin-left:0;
    border-top:1px solid rgba(0,194,255,.3);
  }
  .primary-nav[data-open="true"]{display:block}
  .nav-list{flex-direction:column;gap:0;overflow:visible;padding:6px 0}
  .nav-item{flex:1 1 auto}
  .nav-link{
    padding:12px 6px;
    border-bottom:1px solid rgba(245,249,255,.12);
    border-left:3px solid transparent;
  }
  .nav-link[aria-current="page"]{
    border-bottom-color:rgba(245,249,255,.12);
    border-left-color:var(--cyan);
  }
  .brand-line{display:none}
}

@media (max-width:720px){
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
  .page-head{padding-top:24px}
  .lede{font-size:16px}
}

@media (max-width:640px){
  .footer-inner{grid-template-columns:1fr;padding:36px var(--gutter) 28px}
  .footer-base{padding-bottom:32px}
  .grid{gap:16px}
  .card{padding:16px}
  .search-hint{display:none}
  .brand-mark{min-width:46px;font-size:13px}
  .brand-name{font-size:16px}
  .btn{width:100%}
  .btn--sm{width:auto}
}

@media (max-width:420px){
  .search-label{display:none}
}

/* ============ motion preferences ============ */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,
  *::before,
  *::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  .card:hover,
  .btn:hover,
  .btn:active{transform:none;box-shadow:var(--shadow-hard)}
  .scroll-progress{transition:none}
}