/* UPONLY shared UI: monochrome editorial system (serif display + italic accents, chrome on near-black).
   Used by app.html and the info pages. index.html keeps its own inline copy of the same tokens. */
:root{
  --ink:#050505; --ink-2:#0C0C0C; --ink-3:#161616; --ink-4:#1E1E1E;
  --line:#222222; --line-2:#2E2E2E;
  --paper:#F2F2F0; --mute:#8C8C89; --dim:#5E5E5B;
  --up:#9FDDB4; --down:#EE9C9C; --warn:#E8D29A;
  --f-display:"Instrument Serif","Times New Roman",Georgia,serif;
  --f-body:"Inter","Segoe UI",system-ui,sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,Consolas,monospace;
  --r-pill:999px; --r-card:14px; --r-sm:10px;
  color-scheme:dark;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}
body{margin:0;background:var(--ink);color:var(--paper);font:400 15px/1.55 var(--f-body);overflow-x:hidden}
body.grain::after{content:"";position:fixed;inset:0;pointer-events:none;z-index:90;opacity:.06;mix-blend-mode:screen;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}
a{color:inherit}
:focus-visible{outline:2px solid var(--paper);outline-offset:3px;border-radius:6px}
h1,h2,h3,h4{font-family:var(--f-display);font-weight:400;margin:0;letter-spacing:-.01em;text-wrap:balance}
h1 em,h2 em,h3 em{font-style:italic}
p{margin:0}
.skip{position:absolute;left:-999px;top:8px;z-index:100;background:var(--paper);color:var(--ink);padding:8px 12px;border-radius:8px}
.skip:focus{left:8px}
.eyebrow{font:500 11px/1 var(--f-mono);letter-spacing:.22em;text-transform:uppercase;color:var(--mute)}
.mono{font-family:var(--f-mono);font-variant-numeric:tabular-nums}
.mute{color:var(--mute)} .dim{color:var(--dim)}
.up{color:var(--up)} .down{color:var(--down)} .warn{color:var(--warn)}
.fine{font-size:12px;color:var(--mute)}
.lede{color:var(--mute);max-width:60ch}
.hidden{display:none!important}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:10px 12px 10px 18px;border-radius:9px;font:500 14px/1 var(--f-body);text-decoration:none;border:0;cursor:pointer;transition:transform .15s,background .15s,opacity .15s;white-space:nowrap}
.btn:hover{transform:translateY(-1px)}
.btn[disabled]{opacity:.45;cursor:not-allowed;transform:none}
.btn-primary{background:var(--paper);color:var(--ink)}
.btn-primary::after{content:"→";width:20px;height:20px;border-radius:50%;display:grid;place-items:center;background:var(--ink);color:var(--paper);font-size:12px;line-height:1}
.btn-ghost{background:color-mix(in srgb,var(--paper) 12%,transparent);color:var(--paper);padding:10px 18px}
.btn-ghost:hover{background:color-mix(in srgb,var(--paper) 20%,transparent)}
.btn-line{background:transparent;color:var(--paper);border:1px solid var(--line-2);padding:9px 16px}
.btn-line:hover{background:var(--ink-3)}
.btn-sm{padding:7px 12px;font-size:13px;border-radius:8px}
.btn-sm.btn-primary{padding:7px 8px 7px 12px}
.btn-sm.btn-primary::after{width:16px;height:16px;font-size:10px}
.btn-block{width:100%;padding:14px 14px 14px 20px}
.btn-up{background:var(--up);color:var(--ink)} .btn-down{background:var(--down);color:var(--ink)}
.icon-btn{border:0;background:var(--ink-3);color:var(--paper);border-radius:7px;padding:7px 11px;font:500 12px/1 var(--f-body);cursor:pointer}
.icon-btn:hover{background:var(--line-2)}

/* chips, tabs, segmented */
.chip{display:inline-flex;align-items:center;gap:8px;padding:5px 11px;border-radius:var(--r-pill);background:color-mix(in srgb,var(--paper) 8%,transparent);font-size:12px;color:var(--mute);white-space:nowrap}
.dot{width:7px;height:7px;border-radius:50%;background:var(--up);flex:none}
.dot.off{background:var(--down)} .dot.idle{background:var(--mute)} .dot.warn{background:var(--warn)}
.tag{display:inline-block;padding:3px 8px;border-radius:6px;background:var(--ink-3);font:500 11px/1.2 var(--f-mono);color:var(--mute)}
.tag.up{color:var(--up)} .tag.down{color:var(--down)}
.tabs{display:inline-flex;gap:2px;background:var(--ink-3);border-radius:9px;padding:3px;flex-wrap:wrap}
.tabs button,.tabs a{background:transparent;border:0;color:var(--mute);font:500 13px/1 var(--f-body);padding:8px 12px;border-radius:7px;cursor:pointer;text-decoration:none}
.tabs [aria-pressed="true"],.tabs [aria-current="page"]{background:var(--paper);color:var(--ink)}
.seg{display:grid;grid-auto-flow:column;grid-auto-columns:1fr;background:var(--ink-3);border-radius:9px;padding:3px}
.seg button{border:0;background:transparent;color:var(--mute);font:500 14px/1 var(--f-body);padding:10px;border-radius:7px;cursor:pointer}
.seg button[aria-pressed="true"]{background:var(--paper);color:var(--ink)}
.seg.ls button[data-side="long"][aria-pressed="true"]{background:var(--up)}
.seg.ls button[data-side="short"][aria-pressed="true"]{background:var(--down)}

/* cards, fields */
.card{background:var(--ink-2);border:1px solid var(--line);border-radius:var(--r-card);padding:20px;display:grid;gap:12px;align-content:start;min-width:0}
.card>*{min-width:0}
.card h3{font-size:24px;line-height:1.15}
label.fld{display:grid;gap:6px;font-size:12px;color:var(--mute)}
.inp{display:flex;align-items:center;gap:8px;background:var(--ink);border:1px solid var(--line);border-radius:10px;padding:4px 12px;min-width:0}
.inp:focus-within{border-color:var(--mute)}
.inp input,.inp select{flex:1;min-width:0;width:0;background:transparent;border:0;color:var(--paper);font:500 18px/1 var(--f-mono);padding:10px 0;outline:0}
.inp select{font:500 15px/1 var(--f-body);cursor:pointer}
.inp select option{background:var(--ink-2)}
.inp span,.inp .unit{font:500 13px/1 var(--f-mono);color:var(--mute)}
.inp.sm input{font-size:14px;padding:8px 0}
.quick{display:flex;gap:6px;flex-wrap:wrap}
.quick button{flex:1 1 40px;min-width:0;border:1px solid var(--line);background:transparent;color:var(--paper);border-radius:7px;padding:8px 6px;font:500 12px/1 var(--f-mono);cursor:pointer}
.quick button:hover{background:var(--ink-3)}
.quick button[aria-pressed="true"]{background:var(--paper);color:var(--ink);border-color:var(--paper)}
.rows{display:grid;gap:8px;font-size:13px}
.rows>div{display:flex;justify-content:space-between;gap:10px;color:var(--mute)}
.rows b{color:var(--paper);font:500 13px/1.4 var(--f-mono);text-align:right}
.switch{display:inline-flex;align-items:center;gap:10px;cursor:pointer;font-size:13px;color:var(--mute)}
.switch input{appearance:none;width:34px;height:20px;border-radius:20px;background:var(--ink-4);position:relative;cursor:pointer;margin:0;transition:background .15s}
.switch input::after{content:"";position:absolute;top:3px;left:3px;width:14px;height:14px;border-radius:50%;background:var(--mute);transition:transform .15s,background .15s}
.switch input:checked{background:var(--paper)}
.switch input:checked::after{transform:translateX(14px);background:var(--ink)}
input[type=range]{width:100%;accent-color:var(--paper)}

/* tables */
.tbl{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r-card);background:var(--ink-2)}
.tbl table{border-collapse:collapse;width:100%;font:400 13px/1.4 var(--f-mono)}
.tbl th,.tbl td{padding:12px 14px;text-align:right;border-bottom:1px solid var(--line);white-space:nowrap}
.tbl th{font:500 12px/1 var(--f-body);color:var(--mute);background:var(--ink-2);position:sticky;top:0}
.tbl th:first-child,.tbl td:first-child{text-align:left}
.tbl tr:last-child td{border-bottom:0}
.tbl tbody tr{transition:background .12s}
.tbl tbody tr.click{cursor:pointer}
.tbl tbody tr.click:hover{background:var(--ink-3)}
.tbl .empty{padding:36px 14px;text-align:center;color:var(--mute);font-family:var(--f-body)}
.tbl .l{text-align:left}

.mkt{display:flex;align-items:center;gap:10px;font-family:var(--f-body)}
.mkt b{font:500 14px/1.2 var(--f-mono)}
.mkt small{display:block;color:var(--mute);font-size:12px}
img.logo{object-fit:cover;background:var(--ink-3);padding:0}
.logo{width:30px;height:30px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(145deg,#2a2a2a,#0c0c0c);border:1px solid var(--line-2);font:600 10px/1 var(--f-mono);color:var(--paper);flex:none;letter-spacing:-.02em}
.star{background:none;border:0;color:var(--dim);cursor:pointer;font-size:16px;padding:2px}
.star[aria-pressed="true"]{color:var(--paper)}

/* toast + modal */
.toasts{position:fixed;right:16px;bottom:calc(16px + env(safe-area-inset-bottom,0px));display:grid;gap:8px;z-index:120;max-width:min(380px,calc(100vw - 32px))}
.toast{background:var(--paper);color:var(--ink);padding:12px 16px;border-radius:10px;font-size:14px;box-shadow:0 10px 30px #0008;animation:tin .2s ease-out}
.toast.err{background:var(--down)}
.toast small{display:block;opacity:.7;font:400 12px/1.4 var(--f-mono)}
@keyframes tin{from{transform:translateY(8px);opacity:0}}
.modal{position:fixed;inset:0;z-index:110;display:grid;place-items:center;padding:16px;background:#000a;backdrop-filter:blur(6px)}
.modal[hidden]{display:none}
.modal .card{width:min(460px,100%);max-height:calc(100dvh - 32px);overflow:auto;background:var(--ink-2);border-color:var(--line-2);gap:16px}
.modal-head{display:flex;justify-content:space-between;align-items:center;gap:12px}
.x{background:var(--ink-3);border:0;color:var(--paper);width:30px;height:30px;border-radius:8px;cursor:pointer;font-size:16px}
.progress{height:4px;border-radius:4px;background:var(--ink-3);overflow:hidden}
.progress i{display:block;height:100%;width:0;background:linear-gradient(90deg,#6e6e6e,var(--paper));transition:width .25s}
.steps{display:grid;gap:8px;font-size:13px}
.steps div{display:flex;gap:10px;align-items:center;color:var(--dim)}
.steps div.on{color:var(--paper)} .steps div.ok{color:var(--up)}
.steps i{width:18px;height:18px;border-radius:50%;border:1px solid currentColor;display:grid;place-items:center;font:600 10px/1 var(--f-mono);font-style:normal;flex:none}

/* marketing shell (info pages) */
.site-nav{position:sticky;top:0;z-index:30;display:flex;align-items:center;gap:16px;padding:16px max(16px,calc((100vw - 1160px)/2));background:linear-gradient(var(--ink) 40%,transparent)}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font:400 24px/1 var(--f-display);letter-spacing:-.01em;color:var(--paper)}
.brand svg{width:24px;height:24px}
.site-nav ul{display:flex;gap:2px;list-style:none;margin:0 auto;padding:4px;border-radius:12px;background:color-mix(in srgb,var(--paper) 6%,transparent)}
.site-nav ul a{display:block;padding:7px 12px;text-decoration:none;color:var(--paper);opacity:.75;font-size:13px;border-radius:8px}
.site-nav ul a:hover,.site-nav ul a[aria-current="page"]{opacity:1;background:color-mix(in srgb,var(--paper) 8%,transparent)}
.xbtn{display:grid;place-items:center;width:34px;height:34px;border-radius:9px;color:var(--paper);background:color-mix(in srgb,var(--paper) 10%,transparent);flex:none}
.xbtn:hover{background:color-mix(in srgb,var(--paper) 18%,transparent)}
.xbtn svg{width:15px;height:15px}
@media (max-width:900px){.site-nav ul{display:none}.site-nav .xbtn{margin-left:auto}}
.page{max-width:1160px;margin:0 auto;padding:0 16px}
.page-hero{padding:72px 0 40px;display:grid;gap:18px;max-width:820px}
.page-hero h1{font-size:clamp(52px,8vw,104px);line-height:.92}
.prose{display:grid;gap:56px;padding-bottom:80px}
.prose section{display:grid;grid-template-columns:minmax(0,260px) minmax(0,1fr);gap:32px;padding-top:40px;border-top:1px solid var(--line);scroll-margin-top:80px}
.prose section>div{display:grid;gap:14px;align-content:start;max-width:70ch}
.prose h2{font-size:clamp(32px,4vw,46px);line-height:1.02}
.prose p,.prose li{color:color-mix(in srgb,var(--paper) 78%,transparent)}
.prose ul,.prose ol{margin:0;padding-left:20px;display:grid;gap:6px}
.prose code{font:400 13px/1.4 var(--f-mono);background:var(--ink-3);padding:2px 6px;border-radius:5px}
@media (max-width:820px){.prose section{grid-template-columns:minmax(0,1fr);gap:14px}}
.toc{position:sticky;top:84px;display:grid;gap:4px;align-content:start}
.toc a{text-decoration:none;color:var(--mute);font-size:13px;padding:4px 0}
.toc a:hover{color:var(--paper)}
pre.code{margin:0;background:var(--ink-2);border:1px solid var(--line);border-radius:12px;padding:16px;overflow:auto;font:400 12.5px/1.6 var(--f-mono);color:color-mix(in srgb,var(--paper) 85%,transparent)}
.ep{display:grid;grid-template-columns:auto minmax(0,1fr);gap:4px 14px;align-items:baseline;padding:12px 0;border-top:1px solid var(--line)}
.ep b{font:600 11px/1 var(--f-mono);padding:4px 7px;border-radius:5px;background:var(--ink-3);color:var(--up)}
.ep b.post{color:var(--warn)}
.ep code{background:none;padding:0;font-size:14px;color:var(--paper)}
.ep span{grid-column:2;font-size:13px;color:var(--mute)}
.quiz{display:grid;gap:8px;background:var(--ink-2);border:1px solid var(--line);border-radius:12px;padding:16px}
.quiz button{text-align:left;border:1px solid var(--line);background:transparent;color:var(--paper);border-radius:9px;padding:10px 14px;font:400 14px/1.4 var(--f-body);cursor:pointer}
.quiz button:hover{background:var(--ink-3)}
.quiz button.right{border-color:var(--up);color:var(--up)}
.quiz button.wrong{border-color:var(--down);color:var(--down)}
.site-foot{max-width:1160px;margin:0 auto;padding:56px 16px 40px;display:grid;gap:28px;color:var(--mute);font-size:14px;border-top:1px solid var(--line)}
.fcols{display:grid;grid-template-columns:minmax(0,1.6fr) repeat(3,minmax(0,1fr));gap:24px}
.fcols h4{margin:0 0 10px;color:var(--paper);font:500 13px/1 var(--f-body)}
.fcols ul{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.site-foot a{text-decoration:none}.site-foot a:hover{color:var(--paper)}
@media (max-width:760px){.fcols{grid-template-columns:repeat(2,minmax(0,1fr))}.fcols>div:first-child{grid-column:1/-1}}