*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body,h1,h2,h3,h4,p,ul,ol,li,figure,blockquote,dl,dd,dt,table,th,td{margin:0}
ul,ol{padding:0;list-style:none}
img,svg{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
[hidden]{display:none!important}

:root{
  --ice-bg:#E8F2F7;
  --ice-grid:#B9D6E3;
  --ice:#2E8FC0;
  --ice-deep:#14556F;
  --pitch:#0E2B24;
  --pitch-panel:#17463A;
  --pitch-moss:#7FB3A2;
  --sig:#FF6A1F;
  --sig-deep:#C2470A;
  --sig-pale:#FFD8C0;
  --chalk:#F4F7F5;
  --ink:#0F1518;
  --graphite:#59696A;
  --content:1280px;
  --pad:clamp(20px,4vw,64px);
  --gap:24px;
  --font-head:"Barlow Condensed","PingFang SC","Noto Sans SC","Microsoft YaHei",sans-serif;
  --font-num:"IBM Plex Mono","JetBrains Mono",ui-monospace,Consolas,monospace;
  --font-body:"PingFang SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
}

body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.85;
  color:var(--ink);
  background-color:var(--ice-bg);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-family:var(--font-head);font-weight:600;letter-spacing:-0.01em;line-height:1.12}
h1{font-size:clamp(2.6rem,7vw,5.4rem);line-height:1.05}
h2{font-size:clamp(1.8rem,3.4vw,2.4rem)}
h3{font-size:1.25rem;line-height:1.3}
code,kbd,samp,.mono{font-family:var(--font-num)}

:focus-visible{outline:2px solid var(--ice);outline-offset:2px}
.site-footer :focus-visible,.ft__legal :focus-visible{outline-color:var(--ice-deep)}

.wrap{
  width:100%;
  max-width:calc(var(--content) + var(--pad) * 2);
  margin-inline:auto;
  padding-inline:var(--pad);
}

.skip-link{
  position:fixed;
  top:10px;
  left:10px;
  z-index:200;
  transform:translateY(-180%);
  background:var(--sig);
  color:var(--pitch);
  font-family:var(--font-num);
  font-size:13px;
  font-weight:600;
  letter-spacing:.06em;
  padding:10px 16px;
  transition:transform .18s ease;
}
.skip-link:focus{transform:translateY(0)}

/* ---------- header ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:var(--pitch);
  color:var(--chalk);
  border-bottom:1px solid rgba(127,179,162,.28);
}
.hd__inner{
  width:100%;
  max-width:calc(var(--content) + var(--pad) * 2);
  margin-inline:auto;
  padding:14px var(--pad);
  min-height:88px;
  display:flex;
  align-items:center;
  gap:28px;
  transition:min-height .24s ease,padding .24s ease;
}
.site-header.is-compact .hd__inner{min-height:56px;padding-block:8px}
.hd__baseline{height:1px;background:rgba(127,179,162,.16)}
.hd__progress{
  position:fixed;
  top:0;
  left:0;
  right:0;
  height:2px;
  background:var(--sig);
  transform:scaleX(0);
  transform-origin:0 50%;
  z-index:120;
  pointer-events:none;
}

.brand{
  flex:0 0 auto;
  display:flex;
  flex-direction:column;
  gap:2px;
  padding-right:8px;
  border-right:1px solid rgba(127,179,162,.28);
}
.brand__mark{
  font-family:var(--font-head);
  font-size:1.32rem;
  font-weight:600;
  letter-spacing:-0.01em;
  line-height:1.05;
  color:var(--chalk);
}
.brand__meta{
  font-family:var(--font-num);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--pitch-moss);
}
.brand__note{
  font-size:11px;
  letter-spacing:.1em;
  color:rgba(127,179,162,.72);
}
.site-header.is-compact .brand__meta,
.site-header.is-compact .brand__note,
.site-header.is-compact .nav__rail{display:none}

.nav{
  flex:1 1 auto;
  min-width:0;
  display:flex;
  align-items:center;
  gap:24px;
}
.nav__rail{
  flex:1 1 auto;
  min-width:0;
  display:flex;
  align-items:center;
  gap:12px;
  padding-bottom:5px;
  border-bottom:1px dashed rgba(127,179,162,.24);
}
.rail__label{
  flex:0 0 auto;
  font-size:11px;
  letter-spacing:.14em;
  color:rgba(127,179,162,.7);
}
.rail__track{
  display:flex;
  align-items:center;
  gap:6px;
  overflow-x:auto;
  scrollbar-width:none;
  -ms-overflow-style:none;
}
.rail__track::-webkit-scrollbar{display:none}

.nav__list{flex:0 0 auto;display:flex;align-items:center;gap:2px}
.nav__item{display:flex}
.nav__link{
  display:inline-block;
  padding:8px 9px;
  font-size:.94rem;
  line-height:1.2;
  color:var(--pitch-moss);
  border-bottom:2px solid transparent;
  white-space:nowrap;
  transition:color .18s ease,border-color .18s ease;
}
.nav__link:hover{color:var(--chalk)}
.nav__link[aria-current="page"]{color:var(--chalk);border-bottom-color:var(--sig)}
.nav__cta{display:none}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  position:relative;
  z-index:80;
  margin-left:auto;
  padding:8px 10px;
  border:1px solid rgba(127,179,162,.4);
  color:var(--pitch-moss);
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.08em;
}
.nav-toggle__bars{display:flex;flex-direction:column;gap:3px;width:16px}
.nav-toggle__bars span{display:block;height:1px;background:currentColor}
.nav-toggle[aria-expanded="true"]{color:var(--sig);border-color:var(--sig)}

/* ---------- footer ---------- */
.site-footer{background:var(--ice-bg);color:var(--ink);border-top:1px solid var(--ice-grid)}
.ft__grid{
  width:100%;
  max-width:calc(var(--content) + var(--pad) * 2);
  margin-inline:auto;
  padding:64px var(--pad) 44px;
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1fr;
  gap:36px 40px;
}
.ft__brand{display:flex;flex-direction:column;gap:12px;max-width:34ch}
.ft__wordmark{
  font-family:var(--font-head);
  font-size:1.5rem;
  font-weight:600;
  letter-spacing:-0.01em;
  line-height:1.05;
  color:var(--pitch);
}
.ft__desc{font-size:.94rem;line-height:1.8;color:var(--graphite)}
.ft__contact{display:flex;flex-direction:column;gap:5px;margin-top:4px}
.ft__contact-item{
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--ice-deep);
  padding-left:12px;
  border-left:2px solid var(--ice-grid);
}
.ft__col-title{
  font-family:var(--font-num);
  font-size:12px;
  font-weight:600;
  letter-spacing:.14em;
  color:var(--ice-deep);
  padding-bottom:8px;
  margin-bottom:14px;
  border-bottom:1px solid var(--ice-grid);
}
.ft__list{display:flex;flex-direction:column;gap:9px}
.ft__link{
  font-size:.94rem;
  color:var(--graphite);
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.ft__link:hover{color:var(--ice-deep);border-bottom-color:var(--sig-deep)}
.ft__tip{
  margin-top:16px;
  font-size:12px;
  letter-spacing:.06em;
  color:var(--graphite);
  padding-left:10px;
  border-left:2px solid var(--sig-pale);
}
.ft__legal{background:var(--pitch);color:var(--pitch-moss);border-top:1px solid var(--pitch-panel)}
.ft__legal-inner{
  width:100%;
  max-width:calc(var(--content) + var(--pad) * 2);
  margin-inline:auto;
  padding:14px var(--pad);
  display:flex;
  flex-wrap:wrap;
  gap:8px 28px;
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.06em;
}
.ft__legal-item{white-space:nowrap}

/* ---------- surfaces ---------- */
.grid-bg{
  background-color:var(--ice-bg);
  background-image:
    linear-gradient(to right,rgba(185,214,227,.5) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(185,214,227,.5) 1px,transparent 1px),
    linear-gradient(to right,rgba(185,214,227,.9) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(185,214,227,.9) 1px,transparent 1px);
  background-size:8px 8px,8px 8px,96px 96px,96px 96px;
}
.grid-bg--dark{
  background-color:var(--pitch);
  color:var(--chalk);
  background-image:
    linear-gradient(to right,rgba(127,179,162,.09) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(127,179,162,.09) 1px,transparent 1px),
    linear-gradient(to right,rgba(127,179,162,.18) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(127,179,162,.18) 1px,transparent 1px);
  background-size:8px 8px,8px 8px,96px 96px,96px 96px;
}
.hatch{
  background-image:repeating-linear-gradient(45deg,rgba(127,179,162,.22) 0 1px,transparent 1px 9px);
}

.panel{
  position:relative;
  background:var(--chalk);
  border:1px solid var(--ice-grid);
  clip-path:polygon(0 0,calc(100% - 18px) 0,100% 18px,100% 100%,0 100%);
}
.panel--dark{background:var(--pitch-panel);border-color:var(--pitch-moss);color:var(--chalk)}
.panel--signal{background:var(--sig-pale);border-color:var(--sig)}
.panel__head{
  padding:14px 18px;
  border-bottom:1px dashed var(--ice-grid);
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--ice-deep);
}
.panel--dark .panel__head{border-bottom-color:rgba(127,179,162,.35);color:var(--pitch-moss)}
.panel__body{padding:20px 18px}

/* ---------- grid ---------- */
.grid{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:var(--gap);
}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gap)}
.span-3{grid-column:span 3}
.span-4{grid-column:span 4}
.span-5{grid-column:span 5}
.span-6{grid-column:span 6}
.span-7{grid-column:span 7}
.span-8{grid-column:span 8}
.span-12{grid-column:span 12}
.offset-up{transform:translateY(-16px)}
.offset-down{transform:translateY(16px)}

/* ---------- sections ---------- */
.sec{padding-block:clamp(48px,7vw,96px)}
.sec__head{
  display:flex;
  align-items:baseline;
  gap:16px;
  padding-bottom:14px;
  margin-bottom:28px;
  border-bottom:1px solid var(--ice-grid);
}
.sec__num{
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--sig-deep);
}
.sec__title{font-size:clamp(1.8rem,3.4vw,2.4rem)}
.sec__lead{font-size:.95rem;color:var(--graphite);max-width:62ch}
.grid-bg--dark .sec__head,.panel--dark .sec__head{border-bottom-color:rgba(127,179,162,.35)}
.grid-bg--dark .sec__lead{color:var(--pitch-moss)}

.index-rail{
  position:sticky;
  top:96px;
  align-self:start;
  display:flex;
  flex-direction:column;
  gap:10px;
  padding:8px 0;
  font-family:var(--font-num);
  font-size:11px;
  letter-spacing:.1em;
}
.index-rail__item{
  color:var(--graphite);
  padding-left:8px;
  border-left:2px solid transparent;
  transition:color .2s ease,border-color .2s ease;
}
.index-rail__item.is-active{color:var(--ice);border-left-color:var(--ice)}

/* ---------- metric ---------- */
.metric{display:flex;flex-direction:column;gap:4px}
.metric__value{
  font-family:var(--font-num);
  font-size:clamp(2.4rem,5vw,4.2rem);
  font-weight:600;
  line-height:1;
  letter-spacing:-0.03em;
  color:var(--ink);
  font-variant-numeric:tabular-nums;
}
.metric__unit{font-family:var(--font-num);font-size:.8rem;letter-spacing:.1em;color:var(--graphite)}
.metric__label{font-size:12px;letter-spacing:.08em;color:var(--graphite)}
.metric--signal .metric__value{color:var(--sig)}
.grid-bg--dark .metric__value,.panel--dark .metric__value{color:var(--chalk)}
.grid-bg--dark .metric__unit,.grid-bg--dark .metric__label,.panel--dark .metric__label{color:var(--pitch-moss)}

/* ---------- annotation ---------- */
.annot{font-size:12px;letter-spacing:.08em;line-height:1.7;color:var(--graphite)}
.annot--side{
  writing-mode:vertical-rl;
  text-orientation:mixed;
  letter-spacing:.16em;
  color:var(--ice-deep);
}
.grid-bg--dark .annot,.panel--dark .annot{color:var(--pitch-moss)}

/* ---------- prose ---------- */
.prose{max-width:62ch}
.prose p+p{margin-top:1.1em}
.prose h2{margin-top:1.6em;margin-bottom:.5em}
.prose h3{margin-top:1.4em;margin-bottom:.4em}
.prose ul{display:flex;flex-direction:column;gap:8px;margin-top:1em}
.prose li{padding-left:14px;border-left:2px solid var(--ice-grid)}
.prose a{color:var(--ice-deep);border-bottom:1px solid currentColor}
.prose a:hover{color:var(--sig-deep)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-num);
  font-size:13px;
  letter-spacing:.06em;
  line-height:1;
  padding:13px 20px;
  border:1px solid var(--ice-deep);
  color:var(--ice-deep);
  background:transparent;
  clip-path:polygon(0 0,calc(100% - 12px) 0,100% 12px,100% 100%,0 100%);
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.btn:hover{background:var(--ice-deep);color:var(--chalk)}
.btn--primary{background:var(--sig);border-color:var(--sig);color:var(--pitch);font-weight:600}
.btn--primary:hover{background:var(--sig-deep);border-color:var(--sig-deep);color:var(--chalk)}
.btn--ghost{border-color:rgba(127,179,162,.55);color:var(--pitch-moss)}
.btn--ghost:hover{background:var(--pitch-moss);color:var(--pitch)}
.btn--quiet{border-color:transparent;color:var(--ice-deep);padding-inline:10px}
.btn--quiet:hover{background:var(--ice-deep);color:var(--chalk)}

/* ---------- chips ---------- */
.chip{
  display:inline-flex;
  align-items:center;
  gap:7px;
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.06em;
  line-height:1;
  padding:7px 10px;
  border:1px solid var(--ice-grid);
  color:var(--ice-deep);
  background:transparent;
  white-space:nowrap;
  transition:color .18s ease,border-color .18s ease,background-color .18s ease;
}
.chip:hover{border-color:var(--ice);color:var(--ice)}
.chip--season::before{content:"";width:6px;height:6px;background:currentColor;opacity:.4}
.chip--season[aria-current="true"]{
  color:var(--chalk);
  border-color:var(--sig);
  background:rgba(255,106,31,.14);
}
.chip--season[aria-current="true"]::before{background:var(--sig);opacity:1}
.chip--filter[aria-pressed="true"]{background:var(--ice-deep);border-color:var(--ice-deep);color:var(--chalk)}
.site-header .chip{border-color:rgba(127,179,162,.35);color:var(--pitch-moss)}
.site-header .chip:hover{border-color:var(--pitch-moss);color:var(--chalk)}

/* ---------- figure ---------- */
.figure{margin:0;display:flex;flex-direction:column;gap:10px}
.figure__media{
  position:relative;
  aspect-ratio:16 / 9;
  overflow:hidden;
  background-color:var(--pitch-panel);
  background-image:repeating-linear-gradient(45deg,rgba(127,179,162,.16) 0 1px,transparent 1px 10px);
  border:1px solid rgba(127,179,162,.55);
  clip-path:polygon(0 0,calc(100% - 22px) 0,100% 22px,100% 100%,0 100%);
}
.figure__media--wide{aspect-ratio:21 / 9}
.figure__media--tall{aspect-ratio:4 / 5}
.figure__media img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.5) contrast(1.06);
}
.figure__tag{
  position:absolute;
  left:12px;
  top:12px;
  padding:4px 8px;
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--chalk);
  background:rgba(14,43,36,.84);
  border-left:2px solid var(--sig);
}
.figure__cap{font-size:12px;letter-spacing:.06em;color:var(--graphite)}

/* ---------- compare ---------- */
.compare{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1px solid var(--ice-grid)}
.compare__col{padding:18px;border-right:1px dashed var(--ice-grid);transition:background-color .18s ease}
.compare__col:last-child{border-right:0}
.compare__col:hover{background:var(--sig-pale)}
.compare__col--alt:hover{background:rgba(185,214,227,.45)}

/* ---------- table ---------- */
.data-table{font-size:.94rem}
.data-table th,.data-table td{
  padding:11px 14px;
  text-align:left;
  border-bottom:1px solid var(--ice-grid);
}
.data-table th{
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--ice-deep);
  font-weight:600;
}
.data-table td.num{font-family:var(--font-num);font-variant-numeric:tabular-nums}
.data-table--zebra tbody tr:nth-child(odd){background:rgba(232,242,247,.7)}

/* ---------- term ---------- */
.term{border-bottom:1px dashed var(--ice-grid);padding:4px 0}
.term__summary{
  cursor:pointer;
  list-style:none;
  font-size:.94rem;
  color:var(--ice-deep);
  padding:6px 0;
}
.term__summary::-webkit-details-marker{display:none}
.term__summary::before{content:"+";font-family:var(--font-num);margin-right:8px;color:var(--sig-deep)}
.term[open] .term__summary::before{content:"–"}
.term__body{padding:4px 0 12px 20px;font-size:.9rem;color:var(--graphite)}

/* ---------- misc ---------- */
.breadcrumb{
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--graphite);
}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb__item+.breadcrumb__item::before{content:"/";margin-right:8px;color:var(--ice-grid)}
.breadcrumb__link{color:var(--ice-deep);border-bottom:1px solid transparent}
.breadcrumb__link:hover{border-bottom-color:currentColor}

.rule{height:1px;background:var(--ice-grid);border:0}
.rule--dash{height:0;border-top:1px dashed var(--ice-grid);background:none}

@media (prefers-reduced-motion:no-preference){
  .js [data-reveal]{
    opacity:0;
    transform:translateY(12px);
    transition:opacity .24s ease,transform .24s ease;
  }
  .js [data-reveal].is-in{opacity:1;transform:none}
}

@media (max-width:1080px){
  .ft__grid{grid-template-columns:1fr 1fr;gap:32px}
  .ft__brand{grid-column:span 2;max-width:none}
  .nav__link{padding-inline:7px;font-size:.9rem}
}

@media (max-width:900px){
  .hd__inner{min-height:64px;padding-block:12px;gap:12px;align-items:center}
  .site-header.is-compact .hd__inner{min-height:56px}
  .brand{border-right:0;padding-right:0}
  .brand__mark{font-size:1.15rem}
  .brand__note{display:none}
  .nav-toggle{display:inline-flex}
  .nav{
    position:fixed;
    inset:0;
    z-index:70;
    display:flex;
    flex-direction:column;
    align-items:stretch;
    gap:26px;
    padding:84px var(--pad) 40px;
    background:var(--pitch);
    overflow-y:auto;
    transform:translateY(-100%);
    visibility:hidden;
    transition:transform .28s ease,visibility .28s ease;
  }
  .nav[data-open="true"]{transform:translateY(0);visibility:visible}
  .nav__rail{
    flex:0 0 auto;
    display:flex;
    padding-bottom:10px;
    border-bottom:1px dashed rgba(127,179,162,.35);
  }
  .rail__track{flex-wrap:nowrap}
  .nav__list{flex-direction:column;align-items:stretch;gap:0}
  .nav__item{display:block}
  .nav__link{
    display:block;
    padding:16px 0;
    font-size:1.35rem;
    font-family:var(--font-head);
    border-bottom:1px solid rgba(127,179,162,.22);
    color:var(--chalk);
  }
  .nav__link[aria-current="page"]{
    color:var(--sig);
    border-bottom-color:rgba(127,179,162,.22);
    box-shadow:inset 3px 0 0 var(--sig);
    padding-left:14px;
  }
  .nav__cta{display:inline-flex;align-self:flex-start;margin-top:4px}
  body.nav-open{overflow:hidden}
  .grid,.grid-12{grid-template-columns:repeat(4,minmax(0,1fr))}
  .span-3,.span-4,.span-5,.span-6,.span-7,.span-8{grid-column:span 4}
  .offset-up,.offset-down{transform:none}
  .compare{grid-template-columns:1fr}
  .compare__col{border-right:0;border-bottom:1px dashed var(--ice-grid)}
  .compare__col:last-child{border-bottom:0}
}

@media (max-width:640px){
  body{font-size:16px}
  .ft__grid{grid-template-columns:1fr;padding-block:48px 32px}
  .ft__brand{grid-column:span 1}
  .ft__legal-inner{font-size:11px;gap:6px 16px}
  .grid,.grid-12{grid-template-columns:1fr}
  .span-3,.span-4,.span-5,.span-6,.span-7,.span-8,.span-12{grid-column:span 1}
  .sec__head{flex-direction:column;gap:6px}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{transition-duration:.001ms!important;animation-duration:.001ms!important}
  .hd__progress{transition:none}
}