:root{
  --ink:#1B2A38; --ink-2:#3E4C59; --muted:#6B7A88;
  --paper:#FFF6E9; --card:#FFFFFF; --line:#F0E2CF;
  --coral:#FF5C4D; --coral-2:#E24A3C; --teal:#12B5B0; --teal-2:#0E9793; --sun:#FFC93C; --sky:#3AA7FF; --mint:#D9F5F0;
  --tile:#FFFFFF; --tile-ink:#1B2A38; --tile-line:#E6D9C5;
  --radius:18px; --shadow:0 8px 28px rgba(27,42,56,.08);
  --font:"Nunito",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif; --display:"Fredoka","Nunito",system-ui,sans-serif;
}
@media (prefers-color-scheme:dark){:root{
  --ink:#F3F6F9; --ink-2:#C9D3DD; --muted:#8FA0B0; --paper:#121C26; --card:#1B2A38; --line:#26384A;
  --tile:#243546; --tile-ink:#F3F6F9; --tile-line:#35495E; --mint:#12332F; --shadow:0 8px 28px rgba(0,0,0,.35);
}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font);font-size:17px;line-height:1.5;min-height:100dvh;display:flex;flex-direction:column}
a{color:var(--teal-2)} a:hover{color:var(--coral-2)}
.wrap{width:100%;max-width:760px;margin:0 auto;padding:0 16px}
main.wrap{flex:1;padding-bottom:32px}
.skip{position:absolute;left:-999px;top:0;background:var(--sun);padding:8px} .skip:focus{left:8px;z-index:99}
h1,h2,h3{font-family:var(--display);font-weight:600;line-height:1.15;margin:0 0 .4em;letter-spacing:.2px}
h1{font-size:clamp(1.6rem,4vw,2.2rem)} h2{font-size:1.3rem} h3{font-size:1.05rem}
p{margin:.4em 0 .9em}
.muted{color:var(--muted)} .small{font-size:.86rem} .center{text-align:center} .big{font-size:1.15rem}
code,kbd{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:var(--line);padding:1px 6px;border-radius:6px;font-size:.9em}
.inline{display:inline} .linkish{background:none;border:0;padding:0;color:var(--teal-2);font:inherit;cursor:pointer;text-decoration:underline}

/* header */
.site-header{background:var(--ink);color:#fff;padding:14px 0 10px}
.site-header .wrap{display:grid;grid-template-columns:1fr auto;grid-template-areas:"logo nav" "tag nav";align-items:center;gap:2px 12px}
.logo{grid-area:logo;display:inline-flex;gap:4px;text-decoration:none;font-family:var(--display);font-weight:700;font-size:1.5rem;line-height:1}
.logo .t{display:inline-grid;place-items:center;width:1.55em;height:1.55em;border-radius:.35em;color:#fff;transform:rotate(-3deg);transition:transform .2s}
.logo:hover .t{transform:rotate(3deg) scale(1.05)}
.logo .t:nth-child(even){transform:rotate(3deg)} .logo:hover .t:nth-child(even){transform:rotate(-3deg) scale(1.05)}
.t1{background:var(--coral)} .t2{background:var(--sun);color:var(--ink)!important} .t3{background:var(--teal)} .t4{background:var(--sky)} .t5{background:var(--coral)} .t6{background:#fff;color:var(--ink)!important;margin-left:4px}
.tagline{grid-area:tag;margin:6px 0 0;font-size:.82rem;color:#C9D3DD}
.nav{grid-area:nav;display:flex;gap:4px;flex-wrap:wrap;justify-content:flex-end}
.nav a{color:#fff;text-decoration:none;padding:8px 12px;border-radius:999px;font-weight:700;font-size:.95rem}
.nav a.on,.nav a:hover{background:rgba(255,255,255,.14)}
.nav .btn-nav{background:var(--coral)} .nav .btn-nav:hover{background:var(--coral-2)}
.nav .admin-link{background:var(--sun);color:var(--ink)}
@media (max-width:560px){.site-header .wrap{grid-template-areas:"logo logo" "tag tag" "nav nav"}.nav{justify-content:flex-start;margin-top:8px}.nav a{padding:7px 10px;font-size:.9rem}}

.flash{background:var(--sun);color:var(--ink);text-align:center;padding:10px 16px;font-weight:700}
.flash.error{background:var(--coral);color:#fff}
.error{background:#FFE9E7;color:#A3271B;border-left:4px solid var(--coral);padding:10px 14px;border-radius:8px;font-weight:600}
@media (prefers-color-scheme:dark){.error{background:#3A1F1C;color:#FFB5AE}}

/* cards */
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px;margin:18px 0}
.card.narrow{max-width:460px;margin:24px auto}
.bigicon{font-size:3rem}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:2px solid transparent;border-radius:999px;padding:11px 20px;font:inherit;font-weight:800;font-size:1rem;cursor:pointer;text-decoration:none;color:var(--ink);background:var(--line);transition:transform .08s,background .15s,box-shadow .15s;line-height:1.1}
.btn:hover{transform:translateY(-1px)} .btn:active{transform:translateY(1px)}
.btn.primary{background:var(--coral);color:#fff;box-shadow:0 6px 0 var(--coral-2)} .btn.primary:active{box-shadow:0 2px 0 var(--coral-2);transform:translateY(4px)}
.btn.huge{font-size:1.25rem;padding:16px 30px;width:100%;max-width:380px}
.btn.ghost{background:transparent;border-color:var(--line);color:var(--ink-2)} .btn.ghost:hover{border-color:var(--muted)}
.btn.small{padding:7px 12px;font-size:.85rem}
.btn.danger{background:var(--coral);color:#fff} .btn.ghost.danger{background:transparent;color:var(--coral-2);border-color:#F5C5C0}
.btn.warn{background:var(--sun);color:var(--ink)}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}
.btn-row{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0}

/* forms */
.form label{display:block;font-weight:700;margin:12px 0 4px} .form label small{font-weight:400;color:var(--muted)}
.form input:not([type=checkbox]),.form select,.form textarea{display:block;width:100%;margin-top:4px;padding:11px 14px;border:2px solid var(--line);border-radius:12px;font:inherit;background:var(--card);color:var(--ink)}
.form input:focus,.form select:focus,.form textarea:focus{outline:none;border-color:var(--teal)}
.form .check{display:flex;gap:8px;align-items:center;font-weight:600} .form .check input{width:auto;margin:0}
.form button{margin-top:14px}
.form .row{display:flex;gap:12px;flex-wrap:wrap;align-items:end} .form .row label{flex:1;min-width:140px} .form .row button{margin:0 0 2px}
.inline-form{display:flex;gap:8px;align-items:center;margin:8px 0} .inline-form input{margin:0!important;flex:1}
.form fieldset{border:2px dashed var(--line);border-radius:12px;padding:6px 14px 12px;margin:14px 0} legend{font-weight:800;padding:0 6px;color:var(--muted)}
.hp{position:absolute;left:-9999px;opacity:0;height:0;overflow:hidden}
.danger-zone{margin-top:20px;color:var(--muted)} .danger-zone summary{cursor:pointer;font-weight:700}
.cf-turnstile{margin-top:14px}

/* game */
.game-head{text-align:center;margin:20px 0 6px}
.game-head .num{color:var(--coral)} .game-head .sub{margin:0;color:var(--muted);font-weight:600}
.intro{text-align:center}
.intro .btn.huge{margin:10px auto 8px}
.howto{text-align:left;margin-top:14px;color:var(--ink-2)} .howto summary{cursor:pointer;font-weight:800;color:var(--ink)} .howto ul{padding-left:20px}
.example{font-size:.9rem;overflow-x:auto;white-space:nowrap}
.word{display:inline-flex;gap:2px;vertical-align:middle} .word .tile{display:inline-grid;place-items:center;width:1.5em;height:1.5em;border-radius:5px;background:var(--tile);border:1.5px solid var(--tile-line);font-weight:800;font-size:.9em;color:var(--tile-ink)}
.ladder-cell{white-space:nowrap}

.board{margin:12px 0}
.timer-row{display:flex;justify-content:space-between;align-items:baseline;margin:0 4px 10px}
.timer{font-family:var(--display);font-size:2.4rem;font-weight:700;color:var(--ink);font-variant-numeric:tabular-nums;line-height:1}
.timer.warn{color:var(--coral);animation:pulse 1s infinite}
.timer.done{color:var(--teal-2)}
@keyframes pulse{50%{opacity:.55}}
.stepcount{font-weight:800;color:var(--muted)}

.ladder{display:flex;flex-direction:column;align-items:center;gap:6px;padding:14px 8px;background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow)}
.rung{display:flex;gap:6px;position:relative}
.rung .cell{width:min(56px,15vw);height:min(56px,15vw);display:grid;place-items:center;border-radius:12px;background:var(--tile);color:var(--tile-ink);border:2px solid var(--tile-line);font-family:var(--display);font-weight:700;font-size:clamp(1.3rem,5.5vw,1.9rem);text-transform:uppercase;user-select:none;transition:transform .12s,background .15s,border-color .15s}
.rung.start .cell{background:var(--coral);color:#fff;border-color:var(--coral-2)}
.rung.target .cell{background:var(--ink);color:#fff;border-color:var(--ink)}
@media (prefers-color-scheme:dark){.rung.target .cell{background:var(--sun);color:var(--ink);border-color:var(--sun)}}
.rung.done .cell.changed{background:var(--teal);color:#fff;border-color:var(--teal-2)}
.rung.current .cell{cursor:pointer;border-color:var(--sky);background:var(--card)}
.rung.current .cell.sel{border-color:var(--coral);box-shadow:0 0 0 4px rgba(255,92,77,.25);transform:translateY(-2px)}
.rung.current .cell.diff{background:var(--mint);border-color:var(--teal)}
.rung.current .cell.empty{background:var(--paper);border-style:dashed}
.rung.current.shake{animation:shake .4s}
@keyframes shake{20%{transform:translateX(-6px)}40%{transform:translateX(6px)}60%{transform:translateX(-4px)}80%{transform:translateX(4px)}}
.rung.pop .cell{animation:pop .35s} @keyframes pop{40%{transform:scale(1.12)}}
.rung .arrow{position:absolute;left:100%;top:50%;transform:translateY(-50%);margin-left:6px;color:var(--muted);font-size:.8rem}
.ladder .gap{color:var(--muted);font-size:.85rem;line-height:1}
.ladder.mini{padding:8px;gap:4px;box-shadow:none;background:transparent;align-items:flex-start;flex-direction:row;flex-wrap:wrap}
.ladder.mini .rung{gap:2px} .ladder.mini .rung .cell{width:26px;height:26px;font-size:.9rem;border-radius:6px;border-width:1.5px}
.hint{text-align:center;color:var(--muted);font-weight:600;min-height:1.5em;margin:10px 0 6px;font-size:.95rem}
.hint.err{color:var(--coral-2)}
.actions{display:flex;justify-content:center;gap:10px;margin-bottom:8px}

.kb{display:flex;flex-direction:column;gap:6px;margin:8px auto 4px;max-width:520px;touch-action:manipulation}
.kb .krow{display:flex;justify-content:center;gap:5px}
.kb button{flex:1;max-width:44px;height:50px;border:0;border-radius:8px;background:var(--line);color:var(--ink);font:inherit;font-weight:800;font-size:1rem;cursor:pointer;text-transform:uppercase;padding:0}
.kb button:active{background:var(--sun)}
.kb button.wide{max-width:72px;flex:1.6;font-size:.8rem}
.kb button.enter{background:var(--teal);color:#fff}
@media (max-width:400px){.kb button{height:44px}}

.result{text-align:center}
.result h2{font-size:1.7rem} .result h2.win{color:var(--teal-2)} .result h2.lose{color:var(--coral-2)}
.result-stats{font-size:1.15rem;font-weight:700}
.result-actions{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin:8px 0}
.result .cta{background:var(--mint);padding:12px;border-radius:12px;font-weight:600}
.result .optimal{margin:14px 0} .result .optimal summary{cursor:pointer;font-weight:800}
.your-ladder h3{margin:12px 0 0}
#result-rank .rankbig{font-family:var(--display);font-size:1.6rem;color:var(--coral)}
#result-rank .flagged{color:var(--muted);font-size:.9rem}

/* leaderboard */
.lb-head{display:flex;justify-content:space-between;align-items:baseline}
.lb{list-style:none;margin:0;padding:0}
.lb li{display:grid;grid-template-columns:34px 1fr auto auto;gap:10px;align-items:center;padding:8px 6px;border-bottom:1px solid var(--line);font-weight:600}
.lb li:last-child{border-bottom:0}
.lb li.me{background:var(--mint);border-radius:10px}
.lb .rank{display:grid;place-items:center;width:28px;height:28px;border-radius:50%;background:var(--line);font-weight:800;font-size:.85rem}
.lb li:nth-child(1) .rank{background:var(--sun)} .lb li:nth-child(2) .rank{background:#D9DEE3} .lb li:nth-child(3) .rank{background:#E8B892}
.lb .name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.lb .time{font-variant-numeric:tabular-nums;font-weight:800} .lb .steps{color:var(--muted);font-size:.85rem}
.lb .empty{display:block;color:var(--muted);text-align:center}
.myrank{font-weight:600}

/* stats */
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:10px;margin:14px 0}
.stat{background:var(--paper);border-radius:14px;padding:12px;text-align:center}
.stat b{display:block;font-family:var(--display);font-size:1.6rem;color:var(--ink);line-height:1.1} .stat span{font-size:.8rem;color:var(--muted);font-weight:700;text-transform:uppercase;letter-spacing:.04em}
.stat.hot{background:var(--sun)} .stat.hot b,.stat.hot span{color:var(--ink)}
.pill{display:inline-block;padding:2px 10px;border-radius:999px;background:var(--line);font-size:.8rem;font-weight:800;color:var(--ink-2)}
.pill.ok{background:var(--mint);color:var(--teal-2)} .pill.warn{background:#FFE9E7;color:#A3271B}

/* tables */
.table{width:100%;border-collapse:collapse;font-size:.95rem} .table th,.table td{text-align:left;padding:8px 6px;border-bottom:1px solid var(--line);vertical-align:top}
.table th{font-size:.78rem;text-transform:uppercase;letter-spacing:.04em;color:var(--muted)}
.table.small{font-size:.85rem} .table.small th,.table.small td{padding:5px 4px}
.scroll{overflow-x:auto} .pager{display:flex;justify-content:space-between;font-weight:700}
.table.archive .word .tile{width:1.35em;height:1.35em;font-size:.85em}
@media (max-width:640px){.table.archive th:nth-child(2),.table.archive td:nth-child(2),.table.archive th:nth-child(6),.table.archive td:nth-child(6){display:none}}

/* ads */
.ad-slot{position:relative;margin:14px auto;text-align:center;max-width:760px;padding:0 16px}
.ad-slot img{max-width:100%;height:auto;border-radius:10px}
.ad-slot iframe{width:100%;max-width:728px;height:90px;border:0;border-radius:10px}
.ad-result iframe{max-width:300px;height:250px}
.ad-label{position:absolute;top:2px;right:20px;font-size:.6rem;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);background:var(--card);padding:0 4px;border-radius:3px}

/* footer */
.site-footer{background:var(--ink);color:#C9D3DD;padding:22px 0;margin-top:auto;font-size:.9rem;text-align:center}
.site-footer a{color:#fff} .site-footer p{margin:.3em 0}
.kv{list-style:none;padding:0;margin:0} .kv li{display:flex;justify-content:space-between;gap:12px;padding:6px 0;border-bottom:1px solid var(--line)} .kv span{color:var(--muted)}

/* house ads */
.ad-slot.house{max-width:600px}
.house-ad{margin:0;background:var(--card);border:2px dashed var(--line);border-radius:12px;padding:10px 16px;font-size:.9rem;font-weight:700;color:var(--muted)}
.house-ad a{color:var(--teal-2)}

/* accessibility */
:focus-visible{outline:3px solid var(--sky);outline-offset:2px;border-radius:6px}
.yesterday .word .tile{width:1.35em;height:1.35em;font-size:.85em}
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  html{scroll-behavior:auto}
}

/* hard mode + sponsor */
.hardmode{justify-content:center;color:var(--muted);font-size:.9rem;margin-top:10px}
.ad-sponsor{background:var(--card);border-radius:12px;padding:8px 14px;display:flex;align-items:center;gap:10px;justify-content:center;box-shadow:var(--shadow)}
.sponsor-label{font-size:.75rem;font-weight:800;text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}
.ad-sponsor img{max-height:60px;width:auto}
.ad-sponsor iframe{max-width:640px;height:80px}

.challenge-banner{background:var(--ink);color:#fff;font-weight:700;text-align:center;padding:12px 18px}
.versus-line{background:var(--sun);color:var(--ink);font-weight:800;border-radius:12px;padding:10px 14px}