:root{
  --ground:#E9EDF8; --paper:#FFFFFF; --ink:#0B0C12; --muted:#454E72; --rule:#0B0C12; --hair:#C5CCE4;
  --cobalt:#1E3FA8; --cobalt-deep:#162F80; --on-cobalt:#FFFFFF; --on-cobalt-dim:#C9D3F5;
  --yellow:#FFC93C; --on-yellow:#0B0C12; --wash:#DDE3F5; --void:#0B0C12; --on-void:#9AA3C7; --sel:#1E3FA8; --easy:#16834A; --med:#D9741C; --hard:#C42B2B;
  --good:#11724A; --bad:#B7282E;
  --display:"Archivo", "Arial Narrow", "Helvetica Neue", sans-serif;
  --body:"Archivo", "Helvetica Neue", Arial, sans-serif;
  --ease:cubic-bezier(.16,1,.3,1);
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --ground:#0C1230; --paper:#141B3F; --ink:#F1F3FB; --muted:#A8B1D8; --rule:#E6E9F7; --hair:#2B3566;
  --cobalt:#2448C2; --cobalt-deep:#1A3698; --on-cobalt:#FFFFFF; --on-cobalt-dim:#C9D3F5;
  --yellow:#FFC93C; --on-yellow:#0B0C12; --wash:#1D2655; --void:#04061A; --on-void:#7C86B5; --sel:#FFC93C; --easy:#4CC98F; --med:#F29A4A; --hard:#FF6B5E; --good:#4CC98F; --bad:#FF7A72; color-scheme:dark}}
:root[data-theme="dark"]{
  --ground:#0C1230; --paper:#141B3F; --ink:#F1F3FB; --muted:#A8B1D8; --rule:#E6E9F7; --hair:#2B3566;
  --cobalt:#2448C2; --cobalt-deep:#1A3698; --on-cobalt:#FFFFFF; --on-cobalt-dim:#C9D3F5;
  --yellow:#FFC93C; --on-yellow:#0B0C12; --wash:#1D2655; --void:#04061A; --on-void:#7C86B5; --sel:#FFC93C; --easy:#4CC98F; --med:#F29A4A; --hard:#FF6B5E; --good:#4CC98F; --bad:#FF7A72; color-scheme:dark}

*{box-sizing:border-box}
[hidden]{display:none!important}
html{scrollbar-color:var(--cobalt) var(--ground)}
body{margin:0;background:var(--ground);color:var(--ink);font:400 16px/1.55 var(--body);font-variation-settings:"wdth" 100;-webkit-font-smoothing:antialiased;caret-color:var(--cobalt)}
::selection{background:var(--yellow);color:var(--on-yellow)}
a{color:inherit;text-underline-offset:3px;text-decoration-thickness:1.5px}
:focus-visible{outline:3px solid var(--yellow);outline-offset:2px;box-shadow:0 0 0 5px var(--ink)}
.num{font-variant-numeric:tabular-nums}

/* ---------- shell ---------- */
.bar{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:var(--cobalt);color:var(--on-cobalt)}
.bar-in{max-width:1180px;margin:0 auto;padding:0 16px;display:flex;align-items:center;gap:20px;min-height:60px;flex-wrap:wrap}
.mark{display:flex;align-items:center;gap:10px;text-decoration:none;font:800 24px/1 var(--display);font-variation-settings:"wdth" 80;letter-spacing:-.01em}
.mark i{display:grid;grid-template-columns:repeat(3,7px);gap:2px}
.mark i b{width:7px;height:7px;background:var(--on-cobalt)}
.mark i b.y{background:var(--yellow)}
.mark i b.o{background:transparent;box-shadow:inset 0 0 0 1.5px var(--on-cobalt-dim)}
.nav{display:flex;gap:2px;overflow-x:auto;scrollbar-width:none;flex:1 1 auto;min-width:0}
.nav a{flex:none;text-decoration:none;font:600 14px var(--body);color:var(--on-cobalt-dim);padding:19px 11px 17px;border-bottom:3px solid transparent}
.nav a:hover{color:var(--on-cobalt)}
.nav a[aria-current="page"]{color:var(--on-cobalt);border-bottom-color:var(--yellow)}
.streak{display:flex;align-items:center;gap:8px;font:700 14px var(--body);white-space:nowrap}
.streak svg{width:18px;height:18px}
.streak b{font:800 20px/1 var(--display);font-variation-settings:"wdth" 75;color:var(--yellow)}
@media (max-width:760px){.bar{position:static}.bar-in{gap:8px 16px;padding-top:10px}.nav{order:3;flex-basis:100%;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));margin:0 -16px;padding:0 8px 4px}.nav a{padding:9px 8px 7px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.streak{margin-left:auto}}

main{max-width:1180px;margin:0 auto;padding-inline:16px;padding-block:28px 64px;display:grid;gap:36px}
h1,h2,h3{font-family:var(--display);margin:0;text-wrap:balance;font-variation-settings:"wdth" 78}
h1{font-size:clamp(34px,5.4vw,60px);font-weight:800;line-height:.98;letter-spacing:-.02em}
h2{font-size:clamp(24px,3vw,32px);font-weight:800;line-height:1.05;letter-spacing:-.01em}
h3{font-size:20px;font-weight:700;line-height:1.15}
p{margin:0}
.lede{color:var(--muted);max-width:60ch;font-size:17px}
.sub{color:var(--muted);font-size:14px}

/* ---------- surfaces ---------- */
.sheet{background:var(--paper);border:2px solid var(--rule)}
.pad{padding:22px}
@media (max-width:560px){.pad{padding:16px}}
.split{display:grid;grid-template-columns:minmax(0,1.75fr) minmax(0,1fr);gap:20px;align-items:start}
@media (max-width:900px){.split{grid-template-columns:1fr}}
.stack{display:grid;gap:14px}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.between{justify-content:space-between}

/* ---------- controls ---------- */
.btn{appearance:none;font:700 15px var(--body);background:var(--ink);color:var(--paper);border:2px solid var(--ink);padding:11px 18px;cursor:pointer;transition:background .15s,color .15s}
.btn:hover{background:var(--cobalt);border-color:var(--cobalt);color:var(--on-cobalt)}
.btn.alt{background:transparent;color:var(--ink)}
.btn.alt:hover{background:var(--wash);color:var(--ink);border-color:var(--ink)}
.btn.go{background:var(--yellow);color:var(--on-yellow);border-color:var(--ink)}
.btn.go:hover{background:#FFD566}
.btn:disabled{opacity:.4;cursor:not-allowed}
.field{font:700 20px var(--body);font-variant-numeric:tabular-nums;background:var(--paper);color:var(--ink);border:2px solid var(--rule);padding:11px 14px;min-width:0;flex:1 1 160px}
.field::placeholder{color:var(--muted);font-weight:500}
.field:disabled{background:var(--wash)}
label.lab{font:600 13px var(--body);color:var(--muted)}
.chip{display:inline-flex;align-items:center;gap:6px;font:600 13px var(--body);border:1.5px solid var(--rule);padding:4px 9px;background:var(--paper);cursor:pointer;color:var(--ink)}
.chip[aria-pressed="true"]{background:var(--ink);color:var(--paper)}
.dots{display:inline-flex;gap:3px;vertical-align:middle}
.dots i{width:7px;height:7px;border:1.5px solid currentColor}
.dots i.f{background:currentColor}
.fb{font-weight:700;min-height:1.5em}
.fb.good{color:var(--good)} .fb.bad{color:var(--bad)}
.ex{border-top:2px solid var(--rule);padding-top:14px;display:grid;gap:6px}
.ex b{font-family:var(--display);font-variation-settings:"wdth" 78;font-size:17px}

/* ---------- cells (signature) ---------- */
.cell{position:relative;aspect-ratio:1;background:var(--paper);border:2px solid var(--rule);display:grid;place-items:center;font:800 16px/1 var(--display);font-variation-settings:"wdth" 75;color:var(--ink);cursor:pointer;padding:0;transition:transform .5s var(--ease),background .2s}
.cell sup{position:absolute;top:3px;left:4px;font:700 10px/1 var(--body);color:var(--muted)}
.cell.solved{background:var(--yellow);color:var(--on-yellow)}
.cell.solved sup{color:var(--on-yellow)}
.cell.black{background:var(--void);border-color:var(--rule)}
.cell.black sup{color:var(--on-void)}
.cell.today{box-shadow:inset 0 0 0 3px var(--cobalt)}
.cell.on{outline:3px solid var(--cobalt);outline-offset:-6px}
.cell.blank{visibility:hidden}
.cell.stamp{animation:stamp .7s var(--ease)}
@keyframes stamp{0%{transform:rotateX(90deg);background:var(--paper)}100%{transform:none}}
.cell svg{width:46%;height:46%}

.month{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:0}
.month .cell{margin:-1px 0 0 -1px;cursor:default;font-size:15px}
.month .dow{font:700 11px var(--body);color:var(--muted);text-align:center;padding-bottom:6px}
.bank{display:grid;grid-template-columns:repeat(auto-fill,minmax(44px,1fr))}
.bank .cell{margin:-1px 0 0 -1px;font-size:14px}

/* ---------- today ---------- */
.today-q{font:700 clamp(22px,2.6vw,30px)/1.22 var(--display);font-variation-settings:"wdth" 82;max-width:34ch;text-wrap:pretty}
.meta{display:flex;gap:14px;flex-wrap:wrap;font:600 13px var(--body);color:var(--muted)}
.meta span{display:inline-flex;gap:6px;align-items:center}
.share{font:600 14px/1.5 var(--body);white-space:pre;background:var(--wash);border:2px solid var(--rule);padding:12px;overflow-x:auto}

/* clue list = games */
.clues{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,340px),1fr));border-top:2px solid var(--rule)}
.clues.two{grid-template-columns:repeat(auto-fit,minmax(min(100%,460px),1fr))}
.clue{display:grid;grid-template-columns:56px minmax(0,1fr) auto;gap:14px;align-items:center;padding:16px 4px;border-bottom:2px solid var(--rule);text-decoration:none;color:inherit}
.clue:hover{background:var(--wash)}
.clue .n{width:56px;height:56px;border:2px solid var(--rule);display:grid;place-items:center;font:800 24px/1 var(--display);font-variation-settings:"wdth" 75;background:var(--paper)}
.clue:hover .n{background:var(--yellow);color:var(--on-yellow)}
.clue h3{font-size:19px}
.clue p{color:var(--muted);font-size:14px}
.clue .go{font:700 14px var(--body);white-space:nowrap;border:2px solid var(--rule);background:var(--paper);color:var(--ink);padding:8px 14px;transition:background .15s,color .15s}
.clue:hover .go{background:var(--ink);color:var(--paper)}
.clue .spec{font:700 12px var(--body);color:var(--muted);letter-spacing:.04em;text-transform:uppercase}
.clue-b{display:grid;gap:4px;min-width:0}
.clue-r{display:grid;grid-template-columns:minmax(0,1fr) 44px;gap:10px;align-items:center;margin-top:4px;max-width:320px}
.clue-r b{font:800 16px var(--display);font-variation-settings:"wdth" 75;text-align:right}
.clue-c{font:600 12px var(--body);color:var(--muted)}

/* rating track (inline on clue rows) */
.track{position:relative;height:12px;border:2px solid var(--rule);background:var(--paper)}
.track::after{content:"";position:absolute;top:-2px;bottom:-2px;left:30%;width:2px;background:var(--rule)}
.track i{position:absolute;inset:0 auto 0 0;background:var(--cobalt);transition:width .6s var(--ease)}

/* games */
.big{font:800 clamp(48px,9vw,96px)/.9 var(--display);font-variation-settings:"wdth" 70;font-variant-numeric:tabular-nums;letter-spacing:-.02em}
.prompt{font:800 clamp(40px,8vw,84px)/1 var(--display);font-variation-settings:"wdth" 75;text-align:center;padding:22px 0;font-variant-numeric:tabular-nums}
.timebar{height:10px;border:2px solid var(--rule);background:var(--paper)}
.timebar i{display:block;height:100%;background:var(--cobalt);transition:width 1s linear}
.opts{display:grid;gap:8px}
.opt{appearance:none;text-align:left;font:600 16px var(--body);background:var(--paper);color:var(--ink);border:2px solid var(--rule);padding:13px 16px;cursor:pointer;display:flex;gap:12px;align-items:center}
.opt:hover:not(:disabled){background:var(--wash)}
.opt .k{width:26px;height:26px;flex:none;border:2px solid var(--rule);display:grid;place-items:center;font:800 13px var(--display)}
.opt.right{background:var(--yellow);color:var(--on-yellow)}
.opt.wrong{text-decoration:line-through;text-decoration-thickness:2px;color:var(--bad)}
.opt:disabled{cursor:default}
canvas{display:block;width:100%;height:200px}
.legend{display:flex;gap:16px;font:600 13px var(--body);color:var(--muted)}
.legend i{display:inline-block;width:14px;height:4px;vertical-align:middle;margin-right:6px}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));border-top:2px solid var(--rule);border-left:2px solid var(--rule)}
.stats div{border-right:2px solid var(--rule);border-bottom:2px solid var(--rule);padding:12px 14px;background:var(--paper)}
.stats dt{font:600 12px var(--body);color:var(--muted)}
.stats dd{margin:2px 0 0;font:800 26px/1 var(--display);font-variation-settings:"wdth" 75;font-variant-numeric:tabular-nums}
input[type=range]{width:100%;accent-color:var(--cobalt)}
.filters{display:flex;gap:6px;flex-wrap:wrap}

/* footer & notice */
footer{border-top:2px solid var(--rule);max-width:1180px;margin:0 auto;padding:22px 16px 40px;display:flex;gap:10px 22px;flex-wrap:wrap;font:600 14px var(--body);color:var(--muted)}
footer a{color:var(--muted)}
footer span{margin-right:auto}
.notice{position:fixed;left:16px;right:16px;bottom:calc(16px + env(safe-area-inset-bottom,0px));z-index:30;max-width:560px;margin-left:auto;background:var(--paper);border:2px solid var(--rule);box-shadow:0 12px 32px -8px rgba(11,12,18,.35);padding:16px 18px;display:grid;gap:10px}
.notice p{font-size:14px;color:var(--muted)}

/* legal pages */
.doc{max-width:720px}
.doc h2{margin-top:30px;margin-bottom:8px;font-size:24px}
.doc p,.doc li{color:var(--ink);max-width:68ch}
.doc p+p{margin-top:10px}
.doc ul{padding-left:20px;display:grid;gap:6px}
.todo{background:var(--yellow);color:var(--on-yellow);padding:0 4px;font-weight:700}

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

/* ---------- accounts & site pages ---------- */
.skip{position:absolute;left:-9999px;top:0;z-index:50;background:var(--yellow);color:var(--on-yellow);padding:10px 14px;font-weight:700}
.skip:focus{left:16px;top:8px}
.acct{flex:none;margin-left:auto;font:700 14px var(--body);color:var(--on-cobalt);text-decoration:none;border:2px solid var(--on-cobalt);padding:6px 12px;max-width:180px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.acct:hover{background:var(--yellow);color:var(--on-yellow);border-color:var(--yellow)}
@media (max-width:760px){.acct{padding:4px 10px;font-size:13px}}
.theme{display:inline-flex;gap:8px;align-items:center}
select{font:600 14px var(--body);color:var(--ink);background:var(--paper);border:2px solid var(--rule);padding:5px 8px;border-radius:0}
.form{display:grid;gap:14px;max-width:460px}
.form .fieldset{display:grid;gap:6px}
.form .field{flex:none;width:100%;font-size:17px;font-weight:500}
.form select{width:100%;padding:11px 12px;font-size:16px}
.check{display:flex;gap:10px;align-items:flex-start;font-size:14px;color:var(--muted)}
.check input{width:18px;height:18px;margin-top:2px;accent-color:var(--cobalt)}
.tabs{display:flex;border-bottom:2px solid var(--rule);gap:0;flex-wrap:wrap}
.tabs button{appearance:none;font:700 15px var(--body);background:none;color:var(--muted);border:0;border-bottom:4px solid transparent;margin-bottom:-2px;padding:10px 14px;cursor:pointer}
.tabs button[aria-selected="true"]{color:var(--ink);border-bottom-color:var(--sel)}
.callout{background:var(--wash);border:2px solid var(--rule);padding:14px 16px;font-size:15px}
.tbl{width:100%;border-collapse:collapse;font-variant-numeric:tabular-nums}
.tbl th,.tbl td{text-align:left;padding:10px 12px;border-bottom:2px solid var(--rule)}
.tbl th{font:700 13px var(--body);color:var(--muted)}
.tbl td.r,.tbl th.r{text-align:right}
.tbl tr.me td{background:var(--yellow);color:var(--on-yellow)}
.tbl .rk{font:800 20px var(--display);font-variation-settings:"wdth" 75;width:60px}
.scroll-x{overflow-x:auto}
details.faq{border-bottom:2px solid var(--rule);padding:14px 0}
details.faq summary{cursor:pointer;font:700 18px var(--display);font-variation-settings:"wdth" 82;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:6px 8px;margin:-6px -8px;transition:background .15s}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{content:"+";flex:none;width:30px;height:30px;border:2px solid var(--rule);display:grid;place-items:center;font:800 20px/1 var(--display);background:var(--paper);color:var(--ink);transition:background .15s}
details.faq summary:hover{background:var(--wash)}
details.faq summary:hover::after{background:var(--yellow);color:var(--on-yellow)}
details.faq[open] summary::after{content:"−";background:var(--ink);color:var(--paper)}
details.faq p{margin-top:8px;color:var(--ink);max-width:68ch}
.danger{border-color:var(--bad)}
.btn.bad{background:var(--bad);border-color:var(--bad);color:var(--paper)}

/* ---------- stats & profile ---------- */
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.big-track{height:18px}
.heat{display:grid;grid-template-rows:repeat(7,minmax(0,1fr));grid-auto-flow:column;grid-auto-columns:minmax(0,1fr);gap:3px}
.hc,.hk{aspect-ratio:1;border:1.5px solid var(--rule);background:var(--paper)}
.hc.h1,.hk.h1{background:var(--wash);box-shadow:inset 0 0 0 3px var(--yellow)}
.hc.h2,.hk.h2{background:var(--yellow)}
.hc.now{outline:2px solid var(--cobalt);outline-offset:1px}
.hk{display:inline-block;width:14px;height:14px;vertical-align:middle;margin-right:6px}
.tbl th[scope=row]{font:700 15px var(--body);color:var(--ink)}
.tbl td.tw{min-width:140px;width:40%}
.chart{width:100%;height:auto;display:block}
.chart .ax{stroke:var(--rule);stroke-width:2}
.chart .lb{fill:var(--muted);font:600 12px var(--body)}
.chart .ln{fill:none;stroke:var(--cobalt);stroke-width:3;stroke-linejoin:round}
.chart .dot{fill:var(--yellow);stroke:var(--ink);stroke-width:2}
.runs{display:flex;align-items:flex-end;gap:4px;height:180px;border-bottom:2px solid var(--rule)}
.runs span{flex:1;min-width:0;background:var(--cobalt);position:relative}
.runs span:last-child{background:var(--yellow);outline:2px solid var(--ink);outline-offset:-2px}
.runs b{position:absolute;top:-18px;left:0;right:0;text-align:center;font:700 11px var(--body);color:var(--muted)}
.profile-head{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:20px;align-items:center}
@media (max-width:640px){.profile-head{grid-template-columns:auto minmax(0,1fr)}.profile-head>.row{grid-column:1/-1}}
.avatar{width:96px;height:96px;border:2px solid var(--rule);background:var(--yellow);color:var(--on-yellow);display:grid;place-items:center;font:800 40px/1 var(--display);font-variation-settings:"wdth" 75}
@media (max-width:640px){.avatar{width:72px;height:72px;font-size:30px}}
.badges{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,230px),1fr));gap:0;border-top:2px solid var(--rule);border-left:2px solid var(--rule)}
.badge{display:grid;grid-template-columns:44px minmax(0,1fr);gap:12px;align-items:center;padding:12px;border-right:2px solid var(--rule);border-bottom:2px solid var(--rule);background:var(--paper);position:relative}
.badge .cell{width:44px;cursor:default}
.badge b{display:block;font:700 15px var(--body)}
.badge small{display:block;color:var(--muted);font-size:13px;line-height:1.35}
.badge:not(.on) b{color:var(--muted)}

/* ---------- landing ---------- */
.lp{gap:56px}
.hero{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:40px;align-items:center;padding-top:20px}
@media (max-width:900px){.hero{grid-template-columns:1fr;gap:28px}}
.hero h1{font-size:clamp(44px,7.4vw,92px);line-height:.92;letter-spacing:-.025em;font-variation-settings:"wdth" 72;max-width:11ch}
.hero .lede{font-size:clamp(17px,1.6vw,20px);max-width:52ch;color:var(--ink)}
.big-btn{padding:15px 22px;font-size:16px;text-decoration:none;display:inline-block}
.try{box-shadow:0 18px 40px -18px rgba(11,12,18,.35)}
.try .today-q{font-size:clamp(20px,2vw,24px)}
.try-foot{border-top:2px solid var(--rule);padding-top:14px}
.mini-row{display:grid;grid-template-columns:repeat(5,40px)}
.mini-row .cell{margin-left:-2px;cursor:default;font-size:12px}
.lp-stats{margin:0}
.lp-stats dd{font-size:clamp(28px,3.4vw,40px)}
.lp-h{font-size:clamp(28px,4vw,44px)}
.steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
@media (max-width:900px){.steps{grid-template-columns:1fr}}
.steps .n{width:48px;height:48px;border:2px solid var(--rule);display:grid;place-items:center;font:800 22px/1 var(--display);font-variation-settings:"wdth" 75;background:var(--yellow);color:var(--on-yellow)}
.steps p{color:var(--muted)}
.month.mini{grid-template-columns:repeat(7,minmax(0,1fr));margin-top:auto}
.mini-bank{grid-template-columns:repeat(10,minmax(0,1fr));margin-top:auto}
.mini-bank .cell,.month.mini .cell{cursor:default;font-size:11px}
.topics{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr));border-top:2px solid var(--rule);border-left:2px solid var(--rule)}
.topic{display:grid;gap:6px;align-content:start;padding:20px;border-right:2px solid var(--rule);border-bottom:2px solid var(--rule);background:var(--paper);text-decoration:none;color:inherit;position:relative}
.topic:hover{background:var(--wash)}
.topic-n{position:absolute;top:8px;left:10px;font:700 11px var(--body);color:var(--muted)}
.topic h3{font-size:24px;margin-top:8px}
.topic b{font:800 15px var(--body);color:var(--sel)}
.topic p{color:var(--muted);font-size:14px}
.topic q{display:block;margin-top:8px;padding-top:10px;border-top:2px dashed var(--hair);font-size:14px;color:var(--ink);quotes:none}
.cta-band{background:var(--cobalt);color:var(--on-cobalt);padding:40px clamp(20px,4vw,48px);display:grid;grid-template-columns:minmax(0,1fr) auto;gap:24px;align-items:center;border:2px solid var(--rule)}
.cta-band .btn{justify-self:start}
@media (max-width:760px){.cta-band{grid-template-columns:1fr}}
.cta-band h2{font-size:clamp(28px,4vw,44px)}
.cta-band p{color:var(--on-cobalt-dim);max-width:56ch}
.btn.alt.on-cobalt{color:var(--on-cobalt);border-color:var(--on-cobalt)}
.btn.alt.on-cobalt:hover{background:var(--on-cobalt);color:var(--cobalt)}
.landing .nav{flex:0 1 auto;margin-left:auto}
@media (max-width:760px){.landing .nav{display:none}}

/* ---------- training ---------- */
.cell.frozen{background:var(--cobalt);color:var(--on-cobalt);border-color:var(--rule)}
.cell.frozen sup{color:var(--on-cobalt-dim)}
.snow{display:inline-flex;width:16px;height:16px;vertical-align:-3px;color:var(--cobalt)}
.snow svg{width:100%;height:100%}
.goal{display:grid;gap:8px;border-top:2px solid var(--rule);padding-top:14px}
.goal-l{display:inline-flex;gap:8px;align-items:center}
.goal-l select{padding:2px 6px;font-size:13px}
.goal-cells{display:grid}
.goal-cells .cell{margin-left:-2px;cursor:default;aspect-ratio:auto;height:36px}
.plans{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,250px),1fr));border-top:2px solid var(--rule);border-left:2px solid var(--rule)}
.plan{display:grid;grid-template-columns:52px minmax(0,1fr);gap:14px;align-items:start;padding:16px;border-right:2px solid var(--rule);border-bottom:2px solid var(--rule);background:var(--paper);text-decoration:none;color:inherit}
.plan:hover{background:var(--wash)}
.plan .n{width:52px;height:52px;border:2px solid var(--rule);display:grid;place-items:center;font:800 18px/1 var(--display);font-variation-settings:"wdth" 75;background:var(--paper)}
.plan .n.hot{background:var(--yellow);color:var(--on-yellow)}
.plan h3{font-size:18px}
.plan p{color:var(--muted);font-size:14px;margin-top:2px}
.toast{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(20px + env(safe-area-inset-bottom,0px));z-index:40;background:var(--ink);color:var(--paper);padding:12px 18px;font:700 15px var(--body);border:2px solid var(--yellow);max-width:calc(100% - 32px)}
.strikes{display:grid;grid-template-columns:repeat(3,32px)}
.strikes .cell{margin-left:-2px;cursor:default}
.onboard{max-width:720px}
.onboard .opt b{font-size:17px}
.arch{grid-template-columns:repeat(auto-fill,minmax(64px,1fr))}
.arch .cell sup{font-size:10px;white-space:nowrap}

/* ---------- walkthroughs & leagues ---------- */
.wsteps,.walk ol{margin:0;padding-left:22px;display:grid;gap:8px}
.wsteps{border-left:4px solid var(--yellow);padding:10px 12px 10px 34px;background:var(--wash)}
.wsteps li,.walk li{max-width:68ch}
.walk{border-top:2px dashed var(--hair);padding-top:10px}
.walk summary{cursor:pointer;font:700 15px var(--body);margin-bottom:8px}
.podium{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-top:2px solid var(--rule);border-left:2px solid var(--rule)}
.podium div{border-right:2px solid var(--rule);border-bottom:2px solid var(--rule);padding:14px;background:var(--paper);display:grid;gap:4px}
.podium div:first-child{background:var(--yellow);color:var(--on-yellow)}
.podium b{font:800 28px/1 var(--display);font-variation-settings:"wdth" 75}
.podium span{font-weight:700;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.podium small{font-size:13px;opacity:.8}

/* ---------- problem tools, settings, mock ---------- */
.ico{width:16px;height:16px;flex:none}
.btn.sm{padding:6px 10px;font-size:13px;display:inline-flex;gap:6px;align-items:center}
.btn.sm[aria-pressed="true"]{background:var(--yellow);color:var(--on-yellow);border-color:var(--ink)}
.btn.sm[aria-pressed="true"] .ico path{fill:currentColor}
.ptools{display:grid;gap:10px;border-top:2px dashed var(--hair);padding-top:12px}
.ptools .note summary{cursor:pointer;font:700 14px var(--body);color:var(--muted)}
.ptools textarea{width:100%;margin-top:8px;font:500 15px/1.5 var(--body);color:var(--ink);background:var(--paper);border:2px solid var(--rule);padding:10px 12px;resize:vertical}
.keys{font:600 12px var(--body);color:var(--muted)}
@media (max-width:760px){.keys{display:none}}
.chip .ico{width:13px;height:13px}
.fs{border:0;margin:0;padding:0;display:grid;gap:8px}
.fs legend{padding:0;margin-bottom:8px}
.chip.tog{gap:6px}
.chip.tog input{margin:0;accent-color:var(--cobalt)}
.chip.tog:has(input:checked){background:var(--ink);color:var(--paper)}
.chip.tog:has(input:disabled){opacity:.5;cursor:not-allowed}
.chip.tog:focus-within{outline:3px solid var(--yellow);outline-offset:2px}
.mock{max-width:860px}
.mk-t{font-size:clamp(32px,6vw,48px)}
.mk-nav{grid-template-columns:repeat(10,minmax(0,1fr))}
.mk-nav .cell.answered{background:var(--wash);box-shadow:inset 0 0 0 3px var(--cobalt)}
.opt.picked{background:var(--ink);color:var(--paper)}
.opt.picked .k{border-color:var(--paper)}
.mk-review{margin:0;padding-left:22px;display:grid;gap:14px}
.mk-review li{padding-bottom:14px;border-bottom:2px solid var(--hair);display:grid;gap:4px}
.mk-review .q{font-weight:700}
.tag-ok,.tag-miss{display:inline-block;font:700 12px var(--body);padding:2px 6px;margin-right:6px;border:2px solid var(--rule)}
.tag-ok{background:var(--yellow);color:var(--on-yellow)}
.tag-miss{background:var(--void);color:#fff}

/* ---------- landing v2: the board ---------- */
.lp-main{max-width:none;padding:0;gap:64px;padding-bottom:72px}
.lp-sec{max-width:1180px;margin:0 auto;padding-inline:16px;width:100%}
.hero-band{background:linear-gradient(180deg,var(--cobalt) 0,var(--cobalt) 62%,var(--cobalt-deep) 100%);color:var(--on-cobalt);padding-block:36px 72px;border-bottom:2px solid var(--rule)}
.hero-act{gap:12px}
.hero-for{font:600 14px/1.45 var(--body);color:var(--on-cobalt-dim);max-width:44ch}
.hero2{display:grid;gap:28px}
.board{display:grid;grid-template-columns:repeat(var(--cols,12),minmax(0,1fr));gap:2px;background:var(--rule);border:2px solid var(--rule);box-shadow:0 24px 48px -24px rgba(5,8,26,.6)}
.bc{position:relative;aspect-ratio:1;display:grid;place-items:center;background:var(--paper);color:var(--ink);font:800 var(--fs,32px)/1 var(--display);font-variation-settings:"wdth" 75;text-transform:uppercase}
.bc sup{position:absolute;top:4%;left:7%;font:700 max(9px,calc(var(--fs,32px)*.24))/1 var(--body);color:var(--muted)}
.bc.k{background:var(--void)}
.bc.e{background:var(--paper)}
.bc.target{background:var(--wash);box-shadow:inset 0 0 0 3px var(--yellow)}
.bc.target.filled{background:var(--yellow);color:var(--on-yellow);box-shadow:none}
.bc.target.filled sup{color:var(--on-yellow)}
.bc.target svg{width:52%;height:52%}
.bc.pop{animation:stamp .7s var(--ease)}
.board.stamping .bc.l{animation:letterin .6s var(--ease) backwards}
@keyframes letterin{0%{transform:rotateX(90deg);background:var(--yellow);color:transparent}55%{background:var(--yellow);color:var(--on-yellow)}100%{transform:none}}
.hero-foot{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:20px 40px;align-items:end}
@media (max-width:860px){.hero-foot{grid-template-columns:1fr}}
.hero-lede{font-size:clamp(17px,1.7vw,21px);line-height:1.5;max-width:58ch;color:var(--on-cobalt)}
.hero-lede b{color:var(--yellow)}
/* 1 Across */
.clue-sec{margin-top:-104px;position:relative;z-index:2}
.clue-card{padding:24px;display:grid;gap:14px;max-width:900px;box-shadow:0 18px 40px -18px rgba(11,12,18,.4)}
.clue-head{display:flex;justify-content:space-between;align-items:center;gap:16px}
.clue-no{display:inline-block;font:800 15px var(--body);letter-spacing:.06em;text-transform:uppercase;background:var(--ink);color:var(--paper);padding:4px 10px;margin-right:10px}
.clue-q{font:700 clamp(22px,2.6vw,30px)/1.25 var(--display);font-variation-settings:"wdth" 82;max-width:40ch;text-wrap:pretty}
.clue-foot{border-top:2px solid var(--rule);padding-top:12px}
.clock{position:relative;width:56px;height:56px;flex:none}
.clock svg{width:100%;height:100%;transform:rotate(-90deg)}
.clock circle{fill:none;stroke-width:5}
.clock .clock-bg{stroke:var(--wash)}
.clock .clock-fg{stroke:var(--cobalt);transition:stroke-dashoffset 1s linear}
.clock.low .clock-fg{stroke:var(--bad)}
.clock.out .clock-fg{stroke:transparent}
.clock b{position:absolute;inset:0;display:grid;place-items:center;font:800 20px/1 var(--display);font-variation-settings:"wdth" 75}
.clock.low b{color:var(--bad)}
/* sampler + faq + signup */
.tab-n{font:600 12px var(--body);color:var(--muted);margin-left:4px}
.tabs button[aria-selected="true"] .tab-n{color:var(--ink)}
.sampler{min-height:240px}
.faq-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,420px),1fr));gap:0 40px;border-top:2px solid var(--rule)}
.cta-band .row{flex-wrap:wrap}
.sub-form{display:grid;gap:8px;align-content:start;background:var(--paper);color:var(--ink);border:2px solid var(--rule);padding:18px;min-width:min(100%,340px)}
.sub-form label{display:grid;gap:2px}
.sub-form label span{font-size:13px;color:var(--muted)}
.sub-form .field{font-size:16px;font-weight:500}
.hp{position:absolute!important;left:-9999px!important;width:1px;height:1px;opacity:0}
.landing .nav a{color:var(--on-cobalt-dim)}

/* ---------- reports & your data ---------- */
.report summary{cursor:pointer;font:700 14px var(--body);color:var(--muted)}
.rep-box{margin-top:10px;max-width:520px;gap:8px}
.rep-box select,.rep-box textarea{width:100%}
.rep-box textarea{font:500 15px/1.5 var(--body);color:var(--ink);background:var(--paper);border:2px solid var(--rule);padding:10px 12px;resize:vertical}
.callout.danger{border-color:var(--bad)}

/* ---------- problem bank: browse grid + focused problem ---------- */
.bank-wide{grid-template-columns:repeat(auto-fill,minmax(48px,1fr))}
.focus{max-width:880px;margin:0 auto;width:100%}
.focus-bar{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}
.focus-strip{grid-template-columns:repeat(auto-fill,minmax(44px,1fr))}
.focus-strip .cell.on{background:var(--ink);color:var(--paper);outline:none}
.focus-strip .cell.on sup{color:var(--paper)}
.focus-card{padding:28px}
@media (max-width:560px){.focus-bar #fPos{order:3;flex-basis:100%}.focus-card{padding:18px}}

/* ---------- difficulty marks: bottom strip, length and colour both encode level ---------- */
.bank .cell.d1,.bank .cell.d2,.bank .cell.d3{overflow:hidden}
.bank .cell.d1::after,.bank .cell.d2::after,.bank .cell.d3::after{content:"";position:absolute;left:0;bottom:0;height:5px}
.bank .cell.d1::after{width:34%;background:var(--easy)}
.bank .cell.d2::after{width:67%;background:var(--med)}
.bank .cell.d3::after{width:100%;background:var(--hard)}
.dlegend{display:flex;gap:14px;flex-wrap:wrap;margin:0;font:600 12px var(--body);color:var(--muted)}
.dlegend span{display:inline-flex;align-items:center;gap:6px}
.ds{display:inline-block;width:18px;height:14px;border:1.5px solid var(--rule);background:var(--paper);position:relative;overflow:hidden}
.ds::after{content:"";position:absolute;left:0;bottom:0;height:4px}
.ds.d1::after{width:34%;background:var(--easy)}
.ds.d2::after{width:67%;background:var(--med)}
.ds.d3::after{width:100%;background:var(--hard)}
.ds.sv{background:var(--yellow)}
.chip.dc1 .dots{color:var(--easy)} .chip.dc2 .dots{color:var(--med)} .chip.dc3 .dots{color:var(--hard)}
.chip[aria-pressed="true"] .dots{color:inherit}

/* ---------- lessons ---------- */
.lesson h2{margin-top:34px}
.lesson h3{margin-top:22px;margin-bottom:6px}
.lesson ol,.lesson ul{padding-left:22px;display:grid;gap:6px;max-width:68ch}
.formula{font:700 clamp(17px,2vw,20px)/1.4 var(--display);font-variation-settings:"wdth" 85;background:var(--wash);border-left:0;border:2px solid var(--rule);padding:12px 16px;margin:12px 0;max-width:fit-content;overflow-x:auto}
.embed-q{background:var(--paper);border:2px solid var(--rule);padding:18px;margin:16px 0;display:grid;gap:12px}
.doc .embed-label,.embed-label{font:800 12px var(--body);letter-spacing:.06em;text-transform:uppercase;background:var(--yellow);color:var(--on-yellow);justify-self:start;padding:3px 8px}
.embed-q .today-q{font-size:clamp(19px,2vw,23px)}
.lesson-next{margin-top:28px;padding-top:14px;border-top:2px solid var(--rule);font-weight:600}
/* ---------- interview-question pages ---------- */
.qa-page{max-width:820px}
.qa{border-top:2px solid var(--rule);padding:18px 0;display:grid;gap:8px}
.qa-q{font:700 clamp(18px,2vw,22px)/1.3 var(--display);font-variation-settings:"wdth" 85;display:flex;gap:12px;align-items:baseline;margin:0}
.qa-n{flex:none;min-width:34px;height:34px;display:inline-grid;place-items:center;border:2px solid var(--rule);font:800 15px var(--display);background:var(--paper)}
.qa-opts{margin:0;padding-left:68px;display:grid;gap:4px}
.qa .meta{padding-left:46px}
.qa-sol{padding-left:46px}
.qa-sol summary{cursor:pointer;font:700 15px var(--body);color:var(--sel)}
.qa-sol[open] summary{margin-bottom:8px}
.qa-a{font-size:17px}
.qa-steps{margin:8px 0 0;padding-left:20px;display:grid;gap:6px}
.qa-cta{margin:18px 0 6px}
.qa-related{border-top:2px solid var(--rule);margin-top:20px;padding-top:16px}
.qa-related h2{font-size:22px;margin:0 0 10px}
.qa-related ul{padding-left:20px;display:grid;gap:6px}
@media (max-width:560px){.qa .meta,.qa-sol{padding-left:0}.qa-opts{padding-left:22px}}
/* ---------- Google button ---------- */
.btn.google{background:var(--paper);color:var(--ink);border-color:var(--rule);display:inline-flex;align-items:center;justify-content:center;gap:10px;width:100%;max-width:460px}
.btn.google:hover{background:var(--wash);color:var(--ink);border-color:var(--rule)}
.btn.google .ico{width:20px;height:20px}
.gis{width:100%;max-width:400px;min-height:44px;color-scheme:normal}
.or{display:flex;align-items:center;gap:12px;max-width:460px;color:var(--muted);font:600 13px var(--body)}
.or::before,.or::after{content:"";flex:1;height:2px;background:var(--hair)}

/* ---------- landing v3: worked samples, previews, recap ---------- */
.sampler .mix{display:flex;gap:14px;flex-wrap:wrap;font:600 13px var(--body);color:var(--muted)}
.dm{display:inline-block;width:10px;height:10px;margin-right:6px;border:1.5px solid var(--rule);vertical-align:0}
.dm.d1{background:var(--easy)} .dm.d2{background:var(--med)} .dm.d3{background:var(--hard)}
.mc-list{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.mc-list li{display:flex;gap:12px;align-items:center;border:2px solid var(--rule);padding:9px 14px;background:var(--paper);font-weight:600}
.mc-list li.right{background:var(--yellow);color:var(--on-yellow)}
.mc-list .k{width:24px;height:24px;flex:none;border:2px solid currentColor;display:grid;place-items:center;font:800 12px var(--display)}
.worked{position:relative;border:2px solid var(--rule);background:var(--wash);padding:22px 18px 16px;display:grid;gap:8px}
.worked-tag{position:absolute;top:-12px;left:14px;font:800 12px var(--body);letter-spacing:.06em;text-transform:uppercase;background:var(--ink);color:var(--paper);padding:3px 8px}
.worked p{max-width:68ch}
.worked .walk{border-top-color:var(--hair)}
.sampler a.btn{text-decoration:none}
.steps .pv{align-self:end}
.pv{border:2px solid var(--rule);background:var(--ground);padding:12px;display:grid;gap:10px;box-shadow:0 12px 24px -16px rgba(11,12,18,.4)}
.pv-head{display:flex;justify-content:space-between;gap:10px;font:700 12px var(--body);letter-spacing:.05em;text-transform:uppercase;color:var(--muted)}
.pv-head b{color:var(--ink)}
.pv-head b.up{color:var(--good)}
.pv .month .dow{padding-bottom:4px}
.pv-legend{display:flex;gap:12px;flex-wrap:wrap;font:600 12px var(--body);color:var(--muted)}
.sw{display:inline-block;width:12px;height:12px;border:1.5px solid var(--rule);margin-right:5px;vertical-align:-1px;background:var(--paper)}
.sw.solved{background:var(--yellow)} .sw.frozen{background:var(--cobalt)} .sw.today{box-shadow:inset 0 0 0 2px var(--cobalt)}
.pv-list{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.pv-list li{display:grid;grid-template-columns:76px minmax(0,1fr);gap:10px;align-items:center;background:var(--paper);border:2px solid var(--rule);padding:7px 9px;font:600 14px var(--body)}
.due{font:700 10px var(--body);text-transform:uppercase;letter-spacing:.05em;padding:3px 5px;border:1.5px solid var(--rule);text-align:center;white-space:nowrap}
.due.now{background:var(--yellow);color:var(--on-yellow)}
.pv-r{display:grid;grid-template-columns:90px minmax(0,1fr) 40px;gap:10px;align-items:center;font:600 13px var(--body)}
.pv-r b{font:800 15px var(--display);font-variation-settings:"wdth" 75;text-align:right;font-variant-numeric:tabular-nums}
.recap{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,420px);gap:24px 40px;align-items:center;border-top:2px solid var(--rule);border-bottom:2px solid var(--rule);padding-block:28px}
@media (max-width:760px){.recap{grid-template-columns:1fr}}
.recap h2{font-size:clamp(22px,2.6vw,30px)}
.recap .sub-form{min-width:0}
/* Turnstile bot check: only takes space when it has to show a checkbox */
.cf iframe{margin-bottom:14px}