/* ---- base (shared) ---- */
[hidden]{display:none!important}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;color-scheme:light dark}
body{margin:0;font-family:var(--font);background:var(--bg);color:var(--fg);line-height:1.6;font-size:1.0625rem;min-height:100vh;display:flex;flex-direction:column}
main{flex:1}
img,svg{max-width:100%}
a{color:var(--link)}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
h1,h2,h3{font-family:var(--font-head);line-height:1.2;letter-spacing:var(--head-ls,-.01em)}
h1{font-size:clamp(1.7rem,4.5vw,2.6rem);margin:.2em 0 .3em}
h2{font-size:clamp(1.3rem,3vw,1.7rem);margin:1.6em 0 .5em}
h3{font-size:1.15rem;margin:1.3em 0 .4em}
code{font-size:.92em}
.wrap{width:100%;max-width:var(--maxw,1040px);margin:0 auto;padding:0 1rem}
.skip{position:absolute;left:-999px;top:0;background:var(--accent);color:var(--accent-fg);padding:.6rem 1rem;z-index:10}
.skip:focus{left:.5rem;top:.5rem}
.site-header{background:var(--hdr-bg,var(--card));border-bottom:1px solid var(--border);position:sticky;top:0;z-index:5}
.hdr{display:flex;align-items:center;gap:.75rem;min-height:3.6rem;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:.5rem;text-decoration:none;color:var(--hdr-fg,var(--fg));font-family:var(--font-head);font-weight:800;font-size:1.2rem;margin-right:auto}
.brand img{width:32px;height:32px}
.nav-toggle,.theme-toggle{font:inherit;background:transparent;color:var(--hdr-fg,var(--fg));border:1px solid var(--border);border-radius:var(--radius-sm);padding:.35rem .7rem;cursor:pointer;min-height:2.4rem}
.theme-toggle{font-size:1.1rem;width:2.6rem}
.site-nav{flex-basis:100%;display:none;order:3}
.site-nav.open{display:block}
.site-nav ul{list-style:none;margin:0 0 .6rem;padding:0;display:flex;flex-direction:column;gap:.15rem}
.site-nav a{display:block;padding:.5rem .7rem;border-radius:var(--radius-sm);text-decoration:none;color:var(--hdr-fg,var(--fg));font-weight:600;font-size:.95rem}
.site-nav a:hover{background:var(--hover)}
.site-nav a[aria-current=page]{background:var(--accent);color:var(--accent-fg)}
@media (min-width:900px){
  .nav-toggle{display:none}
  .hdr{padding-top:.4rem}
  .site-nav{display:block;flex-basis:100%;order:3}
  .site-nav ul{flex-direction:row;flex-wrap:nowrap;overflow-x:auto;margin:0 -.6rem;padding-bottom:.45rem;scrollbar-width:thin}
  .site-nav a{padding:.35rem .6rem;white-space:nowrap;font-size:.9rem}
  .site-header{position:static}
}
.hero{padding:1.6rem 0 .6rem}
.lead{font-size:1.12rem;color:var(--muted);max-width:52rem;margin:.2rem 0 0}
.tool{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:clamp(1rem,3vw,1.75rem);box-shadow:var(--shadow);margin:1rem 0}
.content,.faq,.related{max-width:52rem}
.content{margin-top:1.5rem}
.content ul,.content ol{padding-left:1.3rem}
.content li{margin:.25rem 0}
.content table{border-collapse:collapse;width:100%;margin:1rem 0;font-size:.95rem}
.content th,.content td{border:1px solid var(--border);padding:.45rem .6rem;text-align:left}
.content th{background:var(--hover)}
.faq details{border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--card);margin:.5rem 0}
.faq summary{cursor:pointer;padding:.85rem 1rem;font-weight:700;list-style-position:outside}
.faq .ans{padding:0 1rem .5rem}
.faq .ans p{margin:.2rem 0 .8rem}
.related{margin-bottom:1rem}
.cards{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:.75rem}
.cards a{display:flex;flex-direction:column;gap:.25rem;height:100%;padding:1rem;border:1px solid var(--border);border-radius:var(--radius);background:var(--card);text-decoration:none;color:var(--fg);transition:transform .15s,border-color .15s}
.cards a:hover{transform:translateY(-2px);border-color:var(--accent)}
.cards span{color:var(--muted);font-size:.92rem}
.ad-slot{display:flex;align-items:center;justify-content:center;min-height:90px;margin:1rem 0;border:1px dashed var(--border);border-radius:var(--radius-sm);color:var(--muted);font-size:.75rem;text-transform:uppercase;letter-spacing:.08em;opacity:.7}
.ad-slot:empty::before{content:""}
.site-footer{margin-top:3rem;border-top:1px solid var(--border);background:var(--card);font-size:.92rem;color:var(--muted)}
.foot{display:grid;gap:1rem;padding:1.6rem 1rem}
@media (min-width:700px){.foot{grid-template-columns:2fr 2fr 1fr}}
.foot ul{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:.3rem 1rem}
.foot a{color:var(--muted)}
.foot-brand{font-weight:800;color:var(--fg);font-family:var(--font-head);margin:0 0 .3rem}
.copy{grid-column:1/-1;margin:0}
.btn,button.btn{display:inline-flex;align-items:center;justify-content:center;gap:.4rem;font:inherit;font-weight:700;background:var(--accent);color:var(--accent-fg);border:0;border-radius:var(--radius-sm);padding:.7rem 1.2rem;cursor:pointer;text-decoration:none;min-height:2.75rem}
.btn:hover{filter:brightness(1.08)}
.btn.ghost{background:transparent;color:var(--fg);border:1px solid var(--border)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.row{display:flex;flex-wrap:wrap;gap:.6rem;align-items:center}
label{font-weight:600}
input,select,textarea{font:inherit;color:var(--fg);background:var(--input-bg,var(--bg));border:1px solid var(--border);border-radius:var(--radius-sm);padding:.6rem .7rem;max-width:100%}
input:focus,select:focus,textarea:focus{border-color:var(--accent)}
.field{display:flex;flex-direction:column;gap:.3rem;margin-bottom:.8rem}
.grid2{display:grid;gap:.8rem}
@media (min-width:640px){.grid2{grid-template-columns:1fr 1fr}}
.muted{color:var(--muted)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}
.nf{text-align:center;padding:4rem 0}
.nf-code{font-size:5rem;font-weight:900;margin:0;color:var(--accent);font-family:var(--font-head)}
.toast{position:fixed;left:50%;bottom:1.2rem;transform:translateX(-50%);background:var(--fg);color:var(--bg);padding:.6rem 1rem;border-radius:var(--radius-sm);font-weight:600;z-index:20;opacity:0;transition:opacity .2s;pointer-events:none}
.toast.show{opacity:1}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

/* ---- reflex tests ---- */
.stage-wrap{display:flex;flex-direction:column;gap:.8rem}
.stage{width:100%;min-height:320px;border-radius:var(--radius);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.6rem;text-align:center;padding:1.5rem;border:0;font:inherit;color:var(--stage-fg);background:var(--stage-bg)}
.stage.tap{cursor:pointer;user-select:none;-webkit-user-select:none;touch-action:manipulation}
.st-title{font-size:clamp(1.6rem,5vw,2.6rem);font-weight:800;margin:0;font-family:var(--font-head);display:block}
.st-sub{font-size:1.05rem;margin:0;opacity:.9;display:block;max-width:36rem}
.st-sub.small{font-size:.85rem}
.st-level,.hud{font-weight:700;margin:0;text-align:center}
.s-wait{background:var(--wait-bg)!important;color:#fff}
.s-go{background:var(--go-bg)!important;color:#08210f}
.s-early{background:var(--early-bg)!important;color:#fff}
.s-ok{background:var(--go-bg)!important;color:#08210f}
.bigdigits{font-size:clamp(2rem,9vw,4rem);font-weight:900;letter-spacing:.08em;margin:0;word-break:break-all;font-variant-numeric:tabular-nums}
.bigword{font-size:clamp(2rem,8vw,3.5rem);font-weight:800;margin:.3rem 0}
.bigin{font-size:1.8rem;text-align:center;width:min(100%,22rem);letter-spacing:.06em}
.bar{width:min(100%,20rem);height:8px;border-radius:9px;background:rgba(127,127,127,.3);overflow:hidden}
.bar span{display:block;height:100%;background:currentColor;animation:shrink linear forwards;transform-origin:left}
@keyframes shrink{from{transform:scaleX(1)}to{transform:scaleX(0)}}
.arena{position:relative;height:min(62vh,440px);border-radius:var(--radius);background:var(--stage-bg);overflow:hidden;touch-action:manipulation}
.target{position:absolute;width:56px;height:56px;border-radius:50%;border:0;cursor:crosshair;background:radial-gradient(circle,var(--accent-fg) 0 18%,var(--accent) 19% 42%,var(--accent-fg) 43% 58%,var(--accent) 59%)}
.grid{display:grid;gap:.5rem;width:min(100%,460px);margin:0 auto;touch-action:manipulation}
.grid.g3{grid-template-columns:repeat(3,1fr)}
.grid.order{width:100%;max-width:760px;gap:.35rem}
.cell{aspect-ratio:1;border:0;border-radius:var(--radius-sm);background:var(--cell-bg);cursor:pointer;transition:background .12s;font:inherit;font-weight:800;font-size:clamp(1rem,3.5vw,1.6rem);color:var(--fg)}
.cell.lit,.cell.tap{background:var(--cell-lit)}
.cell.ok{background:var(--go-bg)}
.cell.bad{background:var(--early-bg)}
.cell.num{background:var(--card);border:2px solid var(--accent)}
.cell.num.hidden{background:var(--accent);color:transparent}
.cell.num.done{visibility:hidden}
.blank{aspect-ratio:1}
.row.center{justify-content:center}
.btn.alt{background:var(--fg);color:var(--bg)}
.btn.small{padding:.35rem .8rem;min-height:2rem;font-size:.9rem;margin-top:.6rem}
.seg .btn.on{background:var(--accent);color:var(--accent-fg);border-color:transparent}
.results{margin-top:1rem;padding-top:.8rem;border-top:1px solid var(--border)}
.hist{padding-left:1.3rem;margin:.5rem 0}
.hist li{display:flex;justify-content:space-between;gap:1rem;max-width:22rem}
.hist time{color:var(--muted);font-size:.9rem}

:root{--font:system-ui,-apple-system,"Segoe UI",Roboto,Ubuntu,sans-serif;--font-head:"Arial Black","Segoe UI",system-ui,sans-serif;--radius:14px;--radius-sm:9px;--maxw:1080px;--bg:#fbf7f2;--fg:#1d1b22;--muted:#5d5866;--card:#ffffff;--accent:#d9481f;--accent-fg:#ffffff;--border:#e6ddd2;--link:#b33a16;--hover:#f4ece2;--shadow:0 8px 30px rgba(60,30,10,.08);--stage-bg:#2a2733;--stage-fg:#fff;--wait-bg:#c0392b;--go-bg:#3ddc84;--early-bg:#8e44ad;--cell-bg:#3a3646;--cell-lit:#ffffff;--hdr-bg:#1d1b22;--hdr-fg:#fff;--input-bg:#fff}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#141218;--fg:#efeaf2;--muted:#a9a2b3;--card:#1e1b24;--accent:#ff6a3d;--accent-fg:#1a0d06;--border:#332e3b;--link:#ff8f6b;--hover:#2a2531;--shadow:none;--stage-bg:#262230;--stage-fg:#fff;--wait-bg:#b03a2e;--go-bg:#3ddc84;--early-bg:#8e44ad;--cell-bg:#3a3646;--cell-lit:#ffffff;--hdr-bg:#0d0b10;--hdr-fg:#fff;--input-bg:#141218}}
:root[data-theme=dark]{--bg:#141218;--fg:#efeaf2;--muted:#a9a2b3;--card:#1e1b24;--accent:#ff6a3d;--accent-fg:#1a0d06;--border:#332e3b;--link:#ff8f6b;--hover:#2a2531;--shadow:none;--stage-bg:#262230;--stage-fg:#fff;--wait-bg:#b03a2e;--go-bg:#3ddc84;--early-bg:#8e44ad;--cell-bg:#3a3646;--cell-lit:#ffffff;--hdr-bg:#0d0b10;--hdr-fg:#fff;--input-bg:#141218}
.site-header{border-bottom:3px solid var(--accent)}
.site-header .theme-toggle,.site-header .nav-toggle{border-color:#4a4552}
.site-nav a:hover{background:#2e2a36}
.hero h1{text-transform:none}
.hero h1::after{content:"";display:block;width:72px;height:6px;background:var(--accent);border-radius:3px;margin-top:.5rem}
.stage .btn{background:#fff;color:#1d1b22}