/* jethoki.cc — Arus Jet: SIGWX / jet-stream chart as a guide. */
:root{
 --paper:#edf0e9;--paper-2:#e3e8e0;--sheet:#f9faf5;--ink:#14211f;--ink-2:#3e4c49;--ink-3:#5d6b67;
 --grid:#c9d3cb;--grid-2:#dce3da;--jet:#0b7552;--jet-d:#07563c;--jet-l:#d3eadc;--jet-ll:#e8f3ec;
 --cb:#bf3a2e;--cat:#e3a51a;--cat-d:#8a6208;--front:#2c53a0;--night:#10202a;--night-2:#18303b;--night-t:#dbe6e0;
 --fd:"Special Gothic Expanded One","Arial Black",system-ui,sans-serif;
 --fb:"Atkinson Hyperlegible Next",system-ui,-apple-system,"Segoe UI",sans-serif;
 --fm:"Atkinson Hyperlegible Mono",ui-monospace,"SFMono-Regular",Menlo,monospace;
 --primary:var(--jet);--font-head:var(--fd);--font-body:var(--fb);
 --r:3px;--gut:16px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:16px}
body{margin:0;background:var(--paper);color:var(--ink);font:400 17.5px/1.68 var(--fb);overflow-x:hidden;text-rendering:optimizeLegibility}
img,svg{max-width:100%}
a{color:var(--front);text-underline-offset:.18em;text-decoration-thickness:1px}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--front);outline-offset:3px;border-radius:2px}
.wrap{width:100%;max-width:1260px;margin:0 auto;padding:0 var(--gut)}
.skip{position:absolute;left:12px;top:-60px;z-index:100;background:var(--ink);color:var(--sheet);padding:12px 16px;font-weight:700;text-decoration:none;border-radius:var(--r)}
.skip:focus{top:12px}
h1,h2,h3{text-wrap:balance}
h1,h2{font-family:var(--fd);font-weight:400;letter-spacing:.005em;color:var(--ink)}
h3{font:700 1.18rem/1.3 var(--fb);margin:1.6em 0 .4em}

/* ---------- header: chart title block + legend-key nav ---------- */
.hd{position:relative;z-index:30;background:var(--sheet);border-bottom:2px solid var(--ink)}
.hd::after{content:"";position:absolute;left:0;right:0;top:100%;height:9px;pointer-events:none;
 background:repeating-linear-gradient(90deg,var(--ink) 0 1px,transparent 1px 60px),repeating-linear-gradient(90deg,var(--ink-3) 0 1px,transparent 1px 12px);
 background-size:auto 9px,auto 5px;background-repeat:repeat-x;opacity:.55}
.hd-in{display:flex;align-items:center;gap:10px;min-height:66px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;min-height:44px;margin-right:auto;min-width:0}
.mk{width:36px;height:36px;flex:none}
.bt{display:flex;flex-direction:column;min-width:0}
.bn{font:400 19px/1 var(--fd);letter-spacing:.04em;white-space:nowrap}
.bg{font:500 11.5px/1.3 var(--fm);color:var(--ink-3);letter-spacing:.02em;margin-top:5px;display:none}
.key{width:24px;height:14px;flex:none;color:var(--jet)}
.nav ul{list-style:none;margin:0;padding:0}
.nav a{display:flex;align-items:center;gap:9px;min-height:44px;color:var(--ink);text-decoration:none;font:700 15.5px/1.25 var(--fb)}
.nav a[aria-current=page]{color:var(--jet-d)}
.nav a[aria-current=page] span{text-decoration:underline;text-decoration-thickness:3px;text-underline-offset:.35em;text-decoration-color:var(--jet)}
.nav .nav-play{display:none}
.ar{width:22px;height:12px;flex:none}
.lsw{display:flex;border:1.5px solid var(--ink);border-radius:var(--r);overflow:hidden;flex:none}
.lsw a{display:grid;place-items:center;min-width:44px;min-height:40px;padding:0 8px;font:700 13.5px/1 var(--fm);color:var(--ink);text-decoration:none;letter-spacing:.04em}
.lsw a+a{border-left:1.5px solid var(--ink)}
.lsw a[aria-current=true]{background:var(--ink);color:var(--sheet)}
.lsw a:hover:not([aria-current]){background:var(--jet-l)}
.hd-play{display:none}
.tg{order:9;display:inline-flex;align-items:center;gap:8px;min-height:44px;min-width:44px;padding:0 12px;border:1.5px solid var(--ink);border-radius:var(--r);background:var(--sheet);color:var(--ink);font:700 15px/1 var(--fb);cursor:pointer}
.tg-i{display:grid;gap:4px;width:20px}
.tg-i i{display:block;height:2px;background:currentColor;transition:transform .2s,opacity .2s}
.tg-i i:nth-child(2){width:70%;margin-left:30%}
.tg[aria-expanded=true] .tg-i i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.tg[aria-expanded=true] .tg-i i:nth-child(2){opacity:0}
.tg[aria-expanded=true] .tg-i i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.tg-t{display:none}
@media (max-width:979.98px){
 .nav{z-index:2;display:none;position:absolute;left:0;right:0;top:100%;background:var(--sheet);border-bottom:2px solid var(--ink);padding:10px var(--gut) 18px;box-shadow:0 18px 30px -18px rgba(20,33,31,.45)}
 .hd.is-open .nav{display:block}
 .nav li{border-bottom:1px solid var(--grid)}
 .nav a{min-height:54px;font-size:17px}
 .nav .nav-play{display:flex;align-items:center;justify-content:center;gap:10px;margin-top:14px;min-height:52px;background:var(--jet);color:#fff;text-decoration:none;font:700 17px/1.2 var(--fb);border-radius:var(--r);box-shadow:0 3px 0 var(--jet-d)}
 .nav-play .ar{width:22px;height:12px}
}
@media (max-width:359.98px){.mk{width:30px;height:30px}.bn{font-size:15.5px;letter-spacing:.02em}.hd-in{gap:8px}.lsw a{min-width:42px;padding:0 6px}}
@media (min-width:420px){.tg-t{display:inline}}
@media (min-width:720px){.hd-play{display:inline-flex;align-items:center;min-height:44px;padding:0 16px;background:var(--jet);color:#fff;border-radius:var(--r);text-decoration:none;font:700 15px/1 var(--fb);box-shadow:0 3px 0 var(--jet-d);white-space:nowrap}.hd-play:hover{background:var(--jet-d)}.bg{display:block}}
@media (min-width:980px){
 .tg{display:none}
 .brand{margin-right:12px}
 .nav{margin-right:auto}
 .nav ul{display:flex;gap:2px 18px;flex-wrap:wrap}
 .nav a{font-size:15px}
 .hd-in{min-height:78px;gap:18px}
}
@media (min-width:980px) and (max-width:1179.98px){.bg{display:none}.nav ul{gap:2px 12px}.nav .key{display:none}}

/* ---------- chart band with the jet stream ---------- */
.band{position:relative;height:clamp(118px,16vw,232px);overflow:hidden;border-bottom:1.5px solid var(--ink);
 background:linear-gradient(var(--grid) 1px,transparent 1px) 0 0/60px 60px,linear-gradient(90deg,var(--grid) 1px,transparent 1px) 0 0/60px 60px,var(--paper)}
.band-page{height:clamp(96px,12vw,170px)}
.band-svg{position:absolute;inset:0;width:100%;height:100%;max-width:none}
.band-svg .core{fill:none;stroke:var(--jet);stroke-width:9;stroke-linecap:round}
.band-svg .flow{fill:none;stroke:rgba(255,255,255,.75);stroke-width:1.6;stroke-dasharray:2 30;stroke-linecap:round;animation:flow 2.6s linear infinite}
.band-svg .iso{fill:none;stroke:var(--jet);stroke-width:1.4;stroke-dasharray:9 7;opacity:.45}
.band-svg .pn,.band-svg .ah{fill:var(--ink)}
.band-svg .bb{stroke:var(--ink);stroke-width:2.6;stroke-linecap:round}
.band-svg .cb{fill:rgba(191,58,46,.06);stroke:var(--cb);stroke-width:2.2}
.band-svg .cat{fill:rgba(227,165,26,.08);stroke:var(--cat-d);stroke-width:2;stroke-dasharray:8 6}
@keyframes flow{to{stroke-dashoffset:-50}}

/* ---------- home hero ---------- */
.hero{background:var(--paper);padding:28px 0 40px;border-bottom:1.5px solid var(--ink)}
.hero-g{display:grid;gap:30px}
.hero-c{min-width:0}
.tblock{display:inline-flex;margin:0 0 18px;border:1.5px solid var(--ink);background:var(--sheet);font:700 13px/1.35 var(--fm);letter-spacing:.03em;color:var(--ink)}
.tblock::before{content:"";width:10px;flex:none;background:var(--jet)}
.tblock span{padding:7px 12px}
.hero h1,.phead h1{font-size:clamp(1.62rem,1.05rem + 2.9vw,3.05rem);line-height:1.1;margin:0 0 18px;overflow-wrap:break-word;hyphens:manual}
.lead p{margin:0;font-size:clamp(1.05rem,.98rem + .3vw,1.24rem);line-height:1.62;color:var(--ink-2);max-width:62ch}
.acts{display:flex;flex-wrap:wrap;gap:12px;margin:24px 0 22px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:12px;min-height:50px;padding:12px 20px;border:0;border-radius:var(--r);background:var(--jet);color:#fff;font:700 16.5px/1.2 var(--fb);text-decoration:none;box-shadow:0 3px 0 var(--jet-d);cursor:pointer;transition:background .15s,transform .15s}
.btn:hover{background:var(--jet-d)}
.btn:active{transform:translateY(2px);box-shadow:0 1px 0 var(--jet-d)}
.btn .ar{width:22px;height:12px;flex:none;transition:transform .2s}
.btn:hover .ar{transform:translateX(3px)}
.btn.ghost{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--ink)}
.btn.ghost:hover{background:var(--sheet)}
.chips{list-style:none;margin:0;padding:12px 0 0;display:grid;gap:4px;border-top:1px solid var(--grid)}
.chips li{display:flex;align-items:center;gap:12px;font:500 14.5px/1.4 var(--fm);color:var(--ink-2);min-height:32px}
@media (max-width:519.98px){.acts .btn{flex:1 1 100%}}

/* cross-section sheet holding the game */
.xsec{container:xs/inline-size;background:var(--sheet);border:2px solid var(--ink);box-shadow:8px 8px 0 var(--jet-l);min-width:0;scroll-margin-top:12px}
.xsec-h{display:flex;flex-wrap:wrap;justify-content:space-between;gap:4px 14px;padding:9px 12px;border-bottom:1.5px solid var(--ink);background:var(--ink);color:var(--sheet);font:700 13px/1.3 var(--fm);letter-spacing:.03em}
.xl{display:flex;align-items:center;gap:8px}
.xl::before{content:"";width:9px;height:9px;border-radius:50%;background:#56d49b;box-shadow:0 0 0 3px rgba(86,212,155,.25)}
.xt{color:#b9c9c1}
.xsec-b{min-height:540px}
@media (min-width:1024px){
 .hero{padding:44px 0 56px}
 .hero-g{grid-template-columns:minmax(0,1fr) minmax(400px,540px);gap:56px;align-items:start}
 .hero-c{padding-top:12px}
}

/* ---------- inner page head ---------- */
.phead{padding:22px 0 32px;border-bottom:1.5px solid var(--ink);background:var(--paper)}
.bc ol{list-style:none;margin:0 0 16px;padding:0;display:flex;flex-wrap:wrap;align-items:center;gap:2px 8px;font:500 14px/1.3 var(--fm)}
.bc a{display:inline-flex;align-items:center;min-height:44px;color:var(--front)}
.bc .sep{color:var(--ink-3)}
.bc span[aria-current]{color:var(--ink-2)}
.phead .lead{max-width:760px}
.nf .btn{margin-top:22px}
.nf .lead{max-width:60ch;color:var(--ink-2)}

/* ---------- document + legend ---------- */
.page{padding:34px 0 56px}
.page-g{display:grid;gap:26px}
.doc{min-width:0;background:var(--sheet);border:1.5px solid var(--ink);padding:24px 18px 32px;position:relative}
.doc::before{content:"";position:absolute;top:0;bottom:0;left:0;width:8px;border-right:1px solid var(--grid);
 background:repeating-linear-gradient(0deg,var(--ink-3) 0 1px,transparent 1px 12px) right top/5px 100% no-repeat,repeating-linear-gradient(0deg,var(--ink) 0 1.5px,transparent 1.5px 60px) right top/8px 100% no-repeat;opacity:.5}
.doc>*{margin-left:4px}
.doc p,.doc li{max-width:70ch}
.doc p{margin:0 0 1em}
.intro{padding-bottom:6px}
.sec{position:relative;margin-top:44px;padding-top:30px;border-top:1.5px solid var(--ink)}
.sec-plain{border-top:0;padding-top:0;margin-top:18px}
.tp{position:absolute;top:-14px;left:0;min-width:46px;padding:4px 8px;background:var(--sheet);border:1.5px solid var(--ink);font:700 14px/1.1 var(--fm);text-align:center;color:var(--ink)}
.tp::after{content:"";position:absolute;left:100%;top:50%;width:26px;height:1.5px;background:var(--jet)}
.sec h2,.faq h2{font-size:clamp(1.3rem,1.08rem + 1vw,1.85rem);line-height:1.18;margin:0 0 16px;scroll-margin-top:24px}
.sec-b>:last-child{margin-bottom:0}
.doc ul,.doc ol{padding:0;margin:0 0 1.1em;list-style:none}
.doc ul li{position:relative;padding-left:32px;margin:.45em 0}
.doc ul li::before{content:"";position:absolute;left:2px;top:.62em;width:20px;height:10px;background:var(--jet);clip-path:polygon(0 38%,62% 38%,62% 0,100% 50%,62% 100%,62% 62%,0 62%)}
.doc ol{counter-reset:o}
.doc ol li{position:relative;padding-left:44px;margin:.6em 0;counter-increment:o}
.doc ol li::before{content:counter(o,decimal-leading-zero);position:absolute;left:0;top:.18em;min-width:32px;padding:2px 4px;border:1.5px solid var(--ink);font:700 12.5px/1.2 var(--fm);text-align:center;background:var(--jet-ll)}
.doc strong{color:var(--ink)}
.doc code{font:500 .92em var(--fm);background:var(--jet-ll);padding:1px 5px;border-radius:2px}
.table-wrap{overflow-x:auto;margin:0 0 1.2em;border:1.5px solid var(--ink);-webkit-overflow-scrolling:touch}
.table-wrap table{border-collapse:collapse;width:100%;min-width:480px;font-size:16px;line-height:1.45}
.table-wrap th{background:var(--ink);color:var(--sheet);font:700 13.5px/1.3 var(--fm);letter-spacing:.02em;text-align:left;padding:10px 12px}
.table-wrap td{padding:10px 12px;border-top:1px solid var(--grid);vertical-align:top}
.table-wrap tr:nth-child(even) td{background:var(--jet-ll)}

/* FAQ with CB-cloud scallop rule */
.faq{margin-top:48px;padding-top:30px;position:relative}
.faq::before{content:"";position:absolute;left:0;right:0;top:0;height:9px;background:radial-gradient(circle at 9px 9px,transparent 6.4px,var(--cb) 6.6px 8.4px,transparent 8.6px) 0 0/18px 9px repeat-x}
.faq-l{border-bottom:1px solid var(--grid)}
.faq details{border-top:1px solid var(--grid)}
.faq summary{display:flex;align-items:flex-start;gap:12px;min-height:54px;padding:14px 4px;cursor:pointer;list-style:none;font:700 17.5px/1.4 var(--fb)}
.faq summary::-webkit-details-marker{display:none}
.faq summary:hover{color:var(--jet-d)}
.fb{width:22px;height:22px;flex:none;margin-top:1px;color:var(--jet);transition:transform .25s}
.faq details[open] .fb{transform:rotate(90deg)}
.fa{padding:0 4px 16px 34px;color:var(--ink-2)}
.fa p{margin:0}

/* page CTA */
.cta{margin-top:44px;padding:20px;border:2px dashed var(--cat-d);background:linear-gradient(90deg,rgba(227,165,26,.1),transparent 70%)}
.cta p{margin:0 0 14px;font-weight:700;font-size:1.02rem;line-height:1.6}

/* legend (TOC) + demo card */
.side{min-width:0;display:grid;gap:22px;align-content:start}
.legend{background:var(--sheet);border:1.5px solid var(--ink)}
.legend summary{display:flex;align-items:center;justify-content:space-between;min-height:48px;padding:0 14px;background:var(--ink);color:var(--sheet);font:700 13.5px/1.2 var(--fm);letter-spacing:.06em;text-transform:uppercase;cursor:pointer;list-style:none}
.legend summary::-webkit-details-marker{display:none}
.legend summary::after{content:"";width:9px;height:9px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg) translateY(-3px);transition:transform .2s}
.legend[open] summary::after{transform:rotate(-135deg) translateY(-2px)}
.legend ol{list-style:none;margin:0;padding:8px 0}
.legend a{display:flex;align-items:flex-start;gap:10px;min-height:44px;padding:9px 14px;color:var(--ink);text-decoration:none;font:500 15.5px/1.35 var(--fb)}
.legend a:hover{background:var(--jet-ll)}
.legend a[aria-current=true]{background:var(--jet-l);box-shadow:inset 4px 0 0 var(--jet)}
.legend .n{flex:none;min-width:30px;padding:2px 3px;border:1.5px solid var(--ink);font:700 12px/1.2 var(--fm);text-align:center;margin-top:1px}
.demo{position:relative;padding:26px 18px 22px;background:var(--sheet);border:1.5px solid var(--ink)}
.demo::before{content:"";position:absolute;left:10px;right:10px;top:-10px;height:9px;background:radial-gradient(circle at 9px 9px,transparent 6.4px,var(--cb) 6.6px 8.4px,transparent 8.6px) 0 0/18px 9px repeat-x}
.demo-t{font:400 1.12rem/1.2 var(--fd);margin:0 0 8px}
.demo p{margin:0 0 14px;font-size:16px;color:var(--ink-2)}
.demo .btn{width:100%}
@media (max-width:1023.98px){.side{display:contents}.legend{order:1}.doc{order:2}.demo{order:3;margin-top:10px}}
@media (min-width:1024px){
 .page{padding:44px 0 72px}
 .page-g{grid-template-columns:minmax(0,1fr) 300px;gap:40px;align-items:start}
 .side{order:2;position:sticky;top:18px;max-height:calc(100vh - 36px);overflow:auto}
 .doc{padding:40px 48px 48px 56px}
 .doc::before{width:14px}
 .doc>*{margin-left:0}
 .legend summary{pointer-events:none}
 .legend summary::after{display:none}
}
@media (min-width:640px) and (max-width:1023.98px){.doc{padding:32px 32px 40px 40px}}

/* ---------- related chart tiles ---------- */
.rel{padding:44px 0 56px;border-top:1.5px solid var(--ink);background:linear-gradient(var(--grid-2) 1px,transparent 1px) 0 0/60px 60px,linear-gradient(90deg,var(--grid-2) 1px,transparent 1px) 0 0/60px 60px,var(--paper)}
.rel-h{font-size:clamp(1.3rem,1.1rem + .9vw,1.8rem);margin:0 0 22px}
.tiles{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(min(100%,215px),1fr))}
.tile{position:relative;display:grid;align-content:start;gap:8px;min-height:44px;padding:18px 18px 46px;background:var(--sheet);border:1.5px solid var(--ink);border-top:4px dashed var(--cat);color:var(--ink);text-decoration:none;transition:transform .18s,box-shadow .18s}
.tile strong{font:400 1.05rem/1.25 var(--fd)}
.tile span{font-size:16px;line-height:1.5;color:var(--ink-2)}
.tile .ar{position:absolute;right:16px;bottom:16px;width:22px;height:12px;color:var(--jet)}
.tile:hover{transform:translate(-3px,-3px);box-shadow:5px 5px 0 var(--jet-l)}

/* ---------- footer: night chart ---------- */
.ft{background:linear-gradient(rgba(219,230,224,.06) 1px,transparent 1px) 0 0/60px 60px,linear-gradient(90deg,rgba(219,230,224,.06) 1px,transparent 1px) 0 0/60px 60px,var(--night);color:var(--night-t);padding:44px 0 28px;border-top:4px solid var(--jet)}
.ft-grid{display:grid;gap:28px}
.ft .brand{color:#fff}
.ft .bg{color:#9fb3aa;display:block}
.ft .mk rect{fill:#f9faf5}
.ft-id p{margin:16px 0 0;font-size:16px;line-height:1.6;color:#c4d2cb;max-width:56ch}
.ft-col h2{font:700 13px/1.2 var(--fm);letter-spacing:.08em;text-transform:uppercase;color:#8fe0b9;margin:0 0 8px}
.ft-col ul{list-style:none;margin:0;padding:0}
.ft-col a{display:flex;align-items:center;min-height:44px;color:#eef4f0;text-decoration:none;font-size:16px}
.ft-col a:hover{color:#8fe0b9;text-decoration:underline}
.ft-base{display:flex;flex-wrap:wrap;align-items:center;gap:10px 16px;padding-top:22px;border-top:1px solid rgba(219,230,224,.18);font:500 14px/1.4 var(--fm);color:#b5c5bd}
.age{display:inline-grid;place-items:center;min-width:48px;min-height:32px;padding:0 8px;border:2px solid var(--cat);color:#ffd36a;font:700 15px/1 var(--fm)}
.cop{margin-left:auto}
@media (min-width:480px){.ft-grid{grid-template-columns:1fr 1fr}.ft-id,.ft-base{grid-column:1/-1}}
@media (min-width:768px){.ft-grid{grid-template-columns:1.5fr 1fr 1fr;gap:40px}.ft-id{grid-column:auto}}
@media (max-width:519.98px){.cop{margin-left:0;width:100%}}

@media (prefers-reduced-motion:reduce){
 html{scroll-behavior:auto}
 *,*::before,*::after{animation:none!important;transition:none!important}
}
@media print{.hd,.band,.side,.rel,.ft,.xsec{display:none}.doc{border:0}}