/* ===== 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,fieldset{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit;background:none;border:0}
button{cursor:pointer}
img,svg,video{display:block;max-width:100%;height:auto}
table{border-collapse:collapse;width:100%}
[hidden]{display:none!important}

/* ===== tokens ===== */
:root{
  --ink:#0B0F0E;
  --deep:#0E2A22;
  --board:#12463A;
  --white:#F2F6F5;
  --neon:#29F2C8;
  --orange:#FF6A2B;
  --silver:#9FB0AC;
  --blue:#4CD3FF;
  --amber:#FFC24B;
  --mist:#D6E2DE;
  --line:rgba(159,176,172,.18);
  --line-strong:rgba(41,242,200,.34);
  --font-sans:system-ui,"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --container:1280px;
  --gutter:clamp(16px,4vw,48px);
  --r-s:10px;
  --r-m:18px;
  --r-l:32px;
  --space-s:clamp(12px,2vw,20px);
  --space-m:clamp(24px,4vw,48px);
  --space-l:clamp(48px,8vw,110px);
  --header-offset:150px;
}

/* ===== base ===== */
body{
  min-height:100vh;
  background-color:var(--ink);
  background-image:
    radial-gradient(70vw 50vh at 88% -8%, rgba(41,242,200,.10), transparent 68%),
    radial-gradient(60vw 46vh at -12% 10%, rgba(18,70,58,.55), transparent 72%);
  background-repeat:no-repeat;
  background-attachment:fixed;
  color:var(--white);
  font-family:var(--font-sans);
  font-size:16px;
  font-weight:400;
  line-height:1.7;
  letter-spacing:.01em;
  overflow-x:hidden;
}
body.is-nav-open{overflow:hidden}
#main-content{scroll-margin-top:120px}
:focus-visible{outline:2px solid var(--neon);outline-offset:3px;border-radius:4px}
::selection{background:rgba(41,242,200,.32);color:var(--white)}

/* ===== layout ===== */
.yb-container{width:100%;max-width:var(--container);margin-inline:auto;padding-inline:var(--gutter)}
.grid{display:grid;gap:clamp(18px,3vw,40px)}
.grid--7-5{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.grid--8-4{grid-template-columns:minmax(0,8fr) minmax(0,4fr)}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.flow>*+*{margin-top:1em}
.stack-s>*+*{margin-top:var(--space-s)}
.stack-m>*+*{margin-top:var(--space-m)}

/* ===== typography ===== */
.display{font-size:clamp(48px,9vw,132px);font-weight:200;line-height:.95;letter-spacing:-.02em;text-wrap:balance}
.section-title{font-size:clamp(24px,3.4vw,40px);font-weight:700;letter-spacing:.01em;line-height:1.15;text-transform:none}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--silver)}
.eyebrow::before{content:"";width:24px;height:1px;background:var(--neon)}
.index-label{display:inline-block;font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--silver)}
.index-label--neon{color:var(--neon)}
.lede{font-size:clamp(16px,1.6vw,19px);color:var(--mist)}
p{color:var(--mist)}

/* ===== data numbers ===== */
.data-num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-weight:700;letter-spacing:-.01em;line-height:1;color:var(--neon)}
.data-num--xl{font-size:clamp(40px,7vw,96px)}
.data-num--l{font-size:clamp(28px,4vw,52px)}
.data-num--m{font-size:clamp(20px,2.6vw,32px)}
.data-num--white{color:var(--white)}
.data-num--amber{color:var(--amber)}
.data-num--blue{color:var(--blue)}

/* ===== skip link ===== */
.skip-link{
  position:fixed;left:var(--gutter);top:-120px;z-index:120;
  padding:12px 22px;border-radius:0 0 var(--r-s) var(--r-s);
  background:var(--neon);color:#04211a;font-weight:700;font-size:14px;
  transition:top .2s ease;
}
.skip-link:focus{top:0}

/* ===== header ===== */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(11,15,14,.94);
  border-bottom:1px solid var(--line);
}
.header-upper{
  max-height:80px;overflow:hidden;
  background:linear-gradient(100deg, rgba(18,70,58,.88), rgba(14,42,34,.42) 46%, rgba(11,15,14,.18));
  border-bottom:1px solid var(--line-strong);
  transition:max-height .32s ease,opacity .32s ease,border-color .32s ease;
}
.site-header[data-condensed] .header-upper{max-height:0;opacity:0;border-color:transparent}
.header-upper-inner{
  display:flex;align-items:center;gap:clamp(12px,2vw,26px);
  min-height:54px;padding-block:8px;
}
.brand-line{
  display:inline-flex;align-items:center;gap:10px;
  font-size:12px;letter-spacing:.14em;color:var(--mist);white-space:nowrap;color:var(--mist);
}
.brand-line::before{content:"";flex:none;width:6px;height:6px;border-radius:50%;background:var(--neon);box-shadow:0 0 12px rgba(41,242,200,.85)}
.season-meter{display:flex;align-items:center;gap:10px;margin-left:auto}
.season-meter-track{
  position:relative;display:block;width:clamp(120px,22vw,260px);height:6px;
  border-radius:999px;overflow:hidden;
  background:linear-gradient(90deg,var(--board),rgba(41,242,200,.14));
}
.season-meter-fill{position:absolute;inset:0;background:linear-gradient(90deg,rgba(41,242,200,.25),var(--neon))}
.season-meter-track::after{
  content:"";position:absolute;inset:0;
  background-image:repeating-linear-gradient(90deg, rgba(11,15,14,.72) 0 1px, transparent 1px calc(100% / 30));
}
.header-cta{
  display:inline-flex;align-items:center;gap:8px;flex:none;
  padding:8px 16px;border-radius:999px;
  font-size:13px;font-weight:600;letter-spacing:.06em;white-space:nowrap;
  color:#04211a;background:linear-gradient(120deg,var(--neon),#8ef7dd);
  border:1px solid rgba(41,242,200,.6);
  transition:transform .2s ease,box-shadow .2s ease;
}
.header-cta::after{content:"\2192";font-family:var(--font-mono)}
.header-cta:hover{transform:translateY(-1px);box-shadow:0 0 0 4px rgba(41,242,200,.16)}

.header-lower{position:relative;background:linear-gradient(180deg, rgba(14,42,34,.28), rgba(11,15,14,0))}
.header-lower-inner{display:flex;align-items:center;justify-content:space-between;gap:clamp(12px,2vw,28px);min-height:68px}
.brand{display:inline-flex;align-items:center;gap:12px;flex:none}
.brand-mark{
  position:relative;display:grid;place-items:center;flex:none;
  width:32px;height:32px;border-radius:11px;
  background:linear-gradient(140deg,var(--board),var(--deep));
  border:1px solid var(--line-strong);
}
.brand-mark span{display:block;width:11px;height:11px;border-radius:50%;background:var(--neon);box-shadow:0 0 14px rgba(41,242,200,.85)}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-name{font-size:17px;font-weight:700;letter-spacing:.08em}
.brand-sub{font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;color:var(--silver)}
.brand--footer .brand-name{font-size:19px}

.nav-list{display:flex;align-items:center;gap:clamp(2px,1.2vw,16px)}
.nav-link{
  position:relative;display:inline-block;padding:10px 12px;
  font-size:14px;font-weight:500;letter-spacing:.05em;color:var(--mist);white-space:nowrap;
  transition:color .2s ease;
}
.nav-link::after{
  content:"";position:absolute;left:12px;right:12px;bottom:2px;height:2px;
  background:var(--neon);transform:scaleX(0);transform-origin:left;
  transition:transform .25s ease;
}
.nav-link:hover{color:var(--white)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--neon)}
.nav-link[aria-current="page"]::after{transform:scaleX(1);box-shadow:0 0 10px rgba(41,242,200,.7)}
.nav-link[aria-current="page"]::before{
  content:"";position:absolute;left:3px;top:50%;width:4px;height:4px;border-radius:50%;
  background:var(--neon);transform:translateY(-50%);
}

.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:9px 15px;border-radius:999px;
  background:rgba(18,70,58,.55);border:1px solid var(--line-strong);
  color:var(--white);font-size:13px;letter-spacing:.14em;
}
.nav-toggle-bars{position:relative;display:block;width:18px;height:2px;background:currentColor;transition:background-color .2s ease}
.nav-toggle-bars::before,.nav-toggle-bars::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:currentColor;
  transition:transform .25s ease,top .25s ease;
}
.nav-toggle-bars::before{top:-6px}
.nav-toggle-bars::after{top:6px}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{top:0;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{top:0;transform:rotate(-45deg)}

.scroll-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:rgba(159,176,172,.14);pointer-events:none}
.scroll-progress-bar{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--blue),var(--neon));box-shadow:0 0 12px rgba(41,242,200,.6)}

/* ===== footer ===== */
.site-footer{
  position:relative;overflow:hidden;
  margin-top:var(--space-l);
  background:linear-gradient(180deg, rgba(14,42,34,.55), rgba(11,15,14,1) 58%);
  border-top:1px solid var(--line-strong);
}
.site-footer::before{
  content:"";position:absolute;left:-8%;right:-8%;top:-40px;height:80px;
  background:linear-gradient(90deg,transparent,rgba(41,242,200,.10),transparent);
  transform:skewY(-1.4deg);pointer-events:none;
}
.footer-inner{
  display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,2fr);
  gap:clamp(28px,5vw,72px);
  padding-block:clamp(44px,6vw,84px);
}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start}
.footer-tagline{margin-top:18px;max-width:22em;font-size:15px;color:var(--mist)}
.footer-ticks{
  width:100%;max-width:340px;height:9px;margin-top:22px;
  border-bottom:1px solid rgba(159,176,172,.32);
  background-image:repeating-linear-gradient(90deg, rgba(41,242,200,.5) 0 1px, transparent 1px calc(100% / 30));
}
.footer-note{margin-top:16px;max-width:24em;font-size:12px;letter-spacing:.04em;color:var(--silver)}
.footer-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:clamp(18px,3vw,38px)}
.footer-col{min-width:0}
.footer-col-title{margin-bottom:16px;font-family:var(--font-mono);font-size:12px;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:var(--neon)}
.footer-list{display:flex;flex-direction:column;gap:11px}
.footer-list a{font-size:14px;color:var(--mist);transition:color .2s ease,padding-left .2s ease}
.footer-list a:hover{color:var(--neon);padding-left:4px}
.footer-item{font-size:13px;line-height:1.65;color:var(--silver);overflow-wrap:anywhere}
.footer-base{border-top:1px solid var(--line);background:rgba(11,15,14,.62)}
.footer-base-inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 28px;
  padding-block:20px;font-size:12px;letter-spacing:.08em;color:var(--silver);
}
.footer-legal{font-family:var(--font-mono);color:var(--silver)}
.footer-year{font-family:var(--font-mono);color:var(--silver)}

/* ===== buttons ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:14px 26px;border-radius:999px;
  font-size:15px;font-weight:600;letter-spacing:.05em;
  border:1px solid transparent;
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease,color .2s ease,background-color .2s ease;
}
.btn--primary{background:linear-gradient(120deg,var(--neon),#7bf2d6);color:#04211a;box-shadow:0 10px 30px rgba(41,242,200,.2)}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 14px 36px rgba(41,242,200,.3)}
.btn--accent{background:linear-gradient(120deg,var(--orange),#ff9a63);color:#1a0a02;box-shadow:0 10px 30px rgba(255,106,43,.22)}
.btn--accent:hover{transform:translateY(-2px)}
.btn--ghost{background:rgba(18,70,58,.42);border-color:var(--line-strong);color:var(--white)}
.btn--ghost:hover{border-color:var(--neon);color:var(--neon)}
.btn--sm{padding:9px 18px;font-size:13px}

/* ===== chips / tabs ===== */
.chip-row{display:flex;flex-wrap:wrap;gap:10px}
.chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 16px;border-radius:999px;
  background:rgba(18,70,58,.45);border:1px solid rgba(159,176,172,.28);
  color:var(--mist);font-size:13px;letter-spacing:.06em;
  transition:border-color .2s ease,color .2s ease,background-color .2s ease;
}
.chip:hover{border-color:var(--neon);color:var(--white)}
.chip[aria-pressed="true"],.chip[data-active]{
  background:linear-gradient(120deg,rgba(41,242,200,.22),rgba(41,242,200,.05));
  border-color:var(--neon);color:var(--neon);
}
.tabs{display:flex;flex-wrap:wrap;gap:4px;border-bottom:1px solid rgba(159,176,172,.2)}
.tab{
  padding:12px 18px;font-size:14px;letter-spacing:.06em;color:var(--silver);
  border-bottom:2px solid transparent;transition:color .2s ease,border-color .2s ease;
}
.tab:hover{color:var(--white)}
.tab[aria-selected="true"]{color:var(--neon);border-bottom-color:var(--neon)}
.tab-panel{padding-top:var(--space-s)}

/* ===== breadcrumbs ===== */
.breadcrumbs{padding-block:22px}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--silver)}
.breadcrumb-list a{transition:color .2s ease}
.breadcrumb-list a:hover{color:var(--neon)}
.breadcrumb-list li+li::before{content:"/";margin-right:8px;color:rgba(159,176,172,.45)}
.breadcrumb-list [aria-current="page"]{color:var(--white)}

/* ===== prose ===== */
.prose{max-width:68ch;font-size:17px;line-height:1.85;color:var(--mist)}
.prose h2{margin-top:2em;font-size:clamp(22px,2.4vw,30px);font-weight:700;color:var(--white);line-height:1.25}
.prose h3{margin-top:1.6em;font-size:clamp(18px,2vw,22px);font-weight:700;color:var(--white)}
.prose p{margin-top:1em}
.prose a{color:var(--neon);text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:1px}
.prose strong{color:var(--white);font-weight:700}
.prose ul,.prose ol{margin-top:1em;padding-left:1.2em;display:flex;flex-direction:column;gap:.5em}
.prose ul li{list-style:none;position:relative;padding-left:14px}
.prose ul li::before{content:"";position:absolute;left:0;top:.72em;width:5px;height:5px;border-radius:50%;background:var(--neon)}
.prose ol{list-style:decimal}
.prose ol li{list-style:decimal}
.prose blockquote{
  margin-top:1.6em;padding:18px 22px;border-left:2px solid var(--neon);
  background:rgba(18,70,58,.35);border-radius:0 var(--r-s) var(--r-s) 0;color:var(--mist);
}
.prose code{font-family:var(--font-mono);font-size:.92em;background:rgba(18,70,58,.6);padding:2px 6px;border-radius:6px;color:var(--neon)}

/* ===== panels ===== */
.panel{
  position:relative;
  padding:clamp(18px,2.4vw,30px);
  border:1px solid var(--line);
  border-radius:var(--r-m);
  background:linear-gradient(160deg, rgba(18,70,58,.62), rgba(14,42,34,.35));
}
.panel--flat{background:rgba(18,70,58,.28)}
.panel--accent{border-color:var(--line-strong);box-shadow:inset 0 0 70px rgba(41,242,200,.06)}
.panel--dark{background:linear-gradient(160deg, rgba(11,15,14,.85), rgba(14,42,34,.4))}
.panel-title{margin-bottom:10px;font-size:clamp(18px,2vw,24px);font-weight:700;letter-spacing:.01em;line-height:1.25}
.panel-meta{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--silver)}

/* ===== ruler ===== */
.ruler{
  position:relative;height:36px;border-bottom:1px solid rgba(159,176,172,.25);
  background-image:linear-gradient(to right, rgba(159,176,172,.35) 0 1px, transparent 1px);
  background-size:2.5% 100%;background-repeat:repeat-x;
}
.ruler::after{
  content:"";position:absolute;left:0;bottom:0;height:3px;width:var(--ruler-fill,0%);
  background:linear-gradient(90deg,rgba(41,242,200,.5),var(--neon));
  transition:width .4s ease;
}

/* ===== media frames ===== */
.media-frame{
  position:relative;display:block;overflow:hidden;isolation:isolate;
  width:100%;border-radius:var(--r-m);
  background:linear-gradient(150deg,var(--board),var(--ink));
  border:1px solid rgba(159,176,172,.2);
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame::after{
  content:"";position:absolute;inset:0;z-index:2;pointer-events:none;
  background:linear-gradient(180deg, rgba(11,15,14,.12) 0%, rgba(11,15,14,.78) 100%);
}
.media-frame--placeholder::before{
  content:"";position:absolute;inset:0;z-index:1;
  background-image:
    linear-gradient(rgba(41,242,200,.10) 1px, transparent 1px),
    linear-gradient(90deg, rgba(41,242,200,.10) 1px, transparent 1px);
  background-size:44px 44px;
}
.media-frame--16x9{aspect-ratio:16/9}
.media-frame--21x9{aspect-ratio:21/9}
.media-frame--4x3{aspect-ratio:4/3}
.media-frame--1x1{aspect-ratio:1/1}
.media-frame--3x4{aspect-ratio:3/4}
.media-caption{
  position:absolute;left:16px;right:16px;bottom:14px;z-index:3;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--mist);
}

/* ===== motion ===== */
.has-js [data-reveal]{opacity:0;transform:translateY(18px);transition:opacity .5s ease,transform .5s ease}
.has-js [data-reveal].is-visible{opacity:1;transform:none}
[data-spy-target][data-active],[data-spy-target].is-active{color:var(--neon)}

/* ===== responsive ===== */
@media (max-width:1080px){
  .footer-inner{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:900px){
  :root{--header-offset:110px}
  .season-meter{display:none}
  .nav-toggle{display:inline-flex}
  .header-lower-inner{min-height:62px}
  .nav{
    position:absolute;left:0;right:0;top:100%;z-index:70;
    display:none;padding:8px var(--gutter) 22px;
    background:linear-gradient(180deg, rgba(14,42,34,.98), rgba(11,15,14,.99));
    border-bottom:1px solid var(--line-strong);
    box-shadow:0 24px 44px rgba(0,0,0,.55);
  }
  .nav[data-open]{display:block}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-link{display:block;padding:15px 14px;font-size:16px;border-bottom:1px solid rgba(159,176,172,.14)}
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{background:rgba(41,242,200,.07)}
  .nav-link[aria-current="page"]::before{left:auto;right:14px;width:6px;height:6px}
  .grid--7-5,.grid--8-4,.grid--3,.grid--2{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:620px){
  .brand-line{display:none}
  .header-upper-inner{justify-content:flex-end;min-height:48px}
  .header-cta{font-size:12px;padding:7px 13px}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-base-inner{flex-direction:column;align-items:flex-start;gap:8px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  .has-js [data-reveal]{opacity:1!important;transform:none!important}
}