/* ---------- tokens: black, ash, silver ---------- */
:root{
  --black:#050506; --coal:#0d0e10; --ash:#8a9097; --ash-dark:#5a5f66; --silver:#d9dde2; --white:#f5f7f9;
  --line:rgba(255,255,255,.13);
  --heading:'Sora',system-ui,sans-serif; --body:'Manrope',system-ui,sans-serif; --mono:'JetBrains Mono',ui-monospace,Consolas,monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
body{background:var(--black);color:var(--silver);font:400 15px/1.55 var(--body);-webkit-font-smoothing:antialiased;min-height:100vh;overflow-x:hidden}
.hidden{display:none!important}
.ph{color:var(--ash);font-size:14px}

/* ---------- background light ---------- */
.bg{position:fixed;inset:0;z-index:-1;overflow:hidden;
  background:radial-gradient(1100px 650px at 15% -10%,#202226 0%,transparent 60%),radial-gradient(900px 600px at 105% 105%,#191b1e 0%,transparent 60%),var(--black)}
.orb{position:absolute;border-radius:50%;filter:blur(80px);opacity:.38;animation:drift 22s ease-in-out infinite}
.o1{width:560px;height:560px;left:-140px;top:8%;background:radial-gradient(circle at 35% 35%,#d4d8dd,#3b3e43 70%)}
.o2{width:480px;height:480px;right:-120px;top:38%;background:radial-gradient(circle at 40% 40%,#aeb4bb,#2b2d31 70%);animation-delay:-8s}
.o3{width:420px;height:420px;left:35%;bottom:-160px;background:radial-gradient(circle at 50% 50%,#8d9399,#222427 70%);animation-delay:-14s}
@keyframes drift{50%{transform:translate(70px,-50px) scale(1.14)}}

/* ---------- liquid glass ---------- */
.glass{position:relative;border-radius:28px;border:1px solid var(--line);
  background:linear-gradient(145deg,rgba(255,255,255,.12),rgba(255,255,255,.035) 45%,rgba(255,255,255,.075));
  -webkit-backdrop-filter:blur(26px) saturate(155%);backdrop-filter:blur(26px) saturate(155%);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.3),inset 0 -1px 0 rgba(255,255,255,.05),inset 0 0 36px rgba(255,255,255,.035),0 30px 70px -24px rgba(0,0,0,.85)}
.glass::before{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;
  background:radial-gradient(120% 55% at 12% 0%,rgba(255,255,255,.17),transparent 55%);opacity:.65}

.wrap{max-width:1180px;margin:0 auto;padding:28px 20px 48px;display:grid;gap:18px}

/* ---------- header ---------- */
.top{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 24px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:16px}
.logo{width:50px;height:50px;border-radius:16px;display:grid;place-items:center;font:700 19px var(--heading);color:#0a0b0c;
  background:linear-gradient(160deg,#fbfcfd,#aab0b8 60%,#6f757c);box-shadow:inset 0 1px 0 #fff,0 10px 30px rgba(220,225,230,.18)}
h1{font:700 24px/1.1 var(--heading);letter-spacing:-.02em;color:var(--white)}
.brand p{color:var(--ash);font-size:13.5px;margin-top:3px}
.pill{display:flex;align-items:center;gap:9px;padding:8px 16px;border-radius:999px;border:1px solid var(--line);background:rgba(0,0,0,.28);font-size:13px;font-weight:500}
.pill i{width:8px;height:8px;border-radius:50%;background:var(--ash-dark)}
.pill.ok i{background:#e9edf1;box-shadow:0 0 10px #e9edf1}
.pill.bad i{background:#6b6f75}

/* ---------- tabs ---------- */
.tabs{display:inline-flex;gap:4px;padding:5px;border-radius:999px;justify-self:start}
.tab{border:0;background:none;color:var(--ash);font:600 14px var(--body);padding:10px 22px;border-radius:999px;cursor:pointer;transition:.2s}
.tab:hover{color:var(--white)}
.tab.on{color:#0a0b0c;background:linear-gradient(180deg,#f4f6f8,#b3b9c1);box-shadow:inset 0 1px 0 #fff,0 4px 14px rgba(0,0,0,.4)}

/* ---------- cards ---------- */
section{display:grid;gap:18px}
.card{padding:24px}
.card-head{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:16px;flex-wrap:wrap}
h2{font:600 18px var(--heading);color:var(--white);letter-spacing:-.01em}
h3{font:600 15px var(--heading);color:var(--white);margin:22px 0 12px}
.opts{display:flex;align-items:center;gap:20px;flex-wrap:wrap;font-size:13.5px;color:var(--ash)}
.range{display:flex;align-items:center;gap:10px}
.range b{color:var(--silver);min-width:20px;font-weight:600}
input[type=range]{accent-color:#d9dde2;width:120px}

.switch{display:flex;align-items:center;gap:9px;cursor:pointer;user-select:none}
.switch input{display:none}
.sw{width:38px;height:22px;border-radius:99px;background:rgba(255,255,255,.1);border:1px solid var(--line);position:relative;transition:.25s}
.sw::after{content:"";position:absolute;top:2px;left:2px;width:16px;height:16px;border-radius:50%;background:var(--ash);transition:.25s}
.switch input:checked+.sw{background:rgba(235,238,242,.28)}
.switch input:checked+.sw::after{left:18px;background:#fff;box-shadow:0 0 8px rgba(255,255,255,.7)}

/* ---------- the board (graph paper) ---------- */
.board{position:relative;aspect-ratio:1400/520;border-radius:22px;overflow:hidden;
  background-color:rgba(0,0,0,.6);
  background-image:linear-gradient(rgba(255,255,255,.055) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.055) 1px,transparent 1px),
                   linear-gradient(rgba(255,255,255,.03) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.03) 1px,transparent 1px);
  background-size:80px 80px,80px 80px,16px 16px,16px 16px;
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.12),inset 0 24px 70px rgba(0,0,0,.65)}
.board.square{aspect-ratio:1/1;max-width:520px}
.board canvas{position:absolute;inset:0;width:100%;height:100%;touch-action:none;cursor:crosshair}
.hint{position:absolute;inset:0;display:grid;place-items:center;pointer-events:none;color:rgba(217,221,226,.28);font:500 22px var(--heading);transition:opacity .3s;text-align:center;padding:20px}
.hint.gone{opacity:0}
.overlay{position:absolute;inset:0;pointer-events:none}
.box{position:absolute;border:1.5px solid rgba(240,243,246,.92);border-radius:8px;background:rgba(255,255,255,.07);
  box-shadow:0 0 0 1px rgba(0,0,0,.45),0 0 26px rgba(255,255,255,.14);animation:pop .35s cubic-bezier(.2,.9,.3,1.2) both}
.box span{position:absolute;left:-1px;top:-25px;min-width:26px;padding:2px 8px;font:700 12px/1.5 var(--mono);color:#0a0b0c;text-align:center;
  background:linear-gradient(#f7f8fa,#b4bac2);border-radius:8px 8px 8px 2px}
.box.in span{top:-1px;border-radius:7px 0 7px 0}
.box.low{border-style:dashed}
@keyframes pop{from{opacity:0;transform:scale(.92)}}

/* ---------- buttons ---------- */
.bar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:16px;flex-wrap:wrap}
.group{display:flex;gap:8px;flex-wrap:wrap}
.btn{border:1px solid var(--line);color:var(--silver);font:600 13.5px var(--body);padding:10px 18px;border-radius:14px;cursor:pointer;
  background:linear-gradient(180deg,rgba(255,255,255,.12),rgba(255,255,255,.04));box-shadow:inset 0 1px 0 rgba(255,255,255,.2);transition:.18s}
.btn:hover{transform:translateY(-1px);color:#fff;border-color:rgba(255,255,255,.28)}
.btn:active{transform:translateY(0)}
.btn.on{color:#fff;background:linear-gradient(180deg,rgba(255,255,255,.26),rgba(255,255,255,.1));border-color:rgba(255,255,255,.35)}
.btn.primary{color:#0a0b0c;border:0;padding:11px 26px;background:linear-gradient(180deg,#f5f7f9,#a9afb7);box-shadow:inset 0 1px 0 #fff,0 8px 26px rgba(215,220,226,.2)}
.btn.primary:hover{color:#000;box-shadow:inset 0 1px 0 #fff,0 10px 32px rgba(215,220,226,.35)}
.btn.busy{opacity:.6;pointer-events:none}
:focus-visible{outline:2px solid #e9edf1;outline-offset:2px}

/* ---------- result ---------- */
.result{border-radius:20px;padding:22px 26px;background:rgba(0,0,0,.42);box-shadow:inset 0 0 0 1px rgba(255,255,255,.09),inset 0 14px 40px rgba(0,0,0,.4)}
.text{font:700 clamp(34px,6vw,60px)/1.2 var(--mono);white-space:pre-wrap;word-break:break-word;min-height:1.2em;
  background:linear-gradient(180deg,#ffffff,#a3a9b0);-webkit-background-clip:text;background-clip:text;color:transparent}
.text .ph{font:500 16px var(--body);-webkit-text-fill-color:var(--ash)}
.meta{display:flex;justify-content:space-between;gap:12px;margin-top:14px;padding-top:12px;border-top:1px solid rgba(255,255,255,.08);color:var(--ash);font-size:13px}

.cells{display:grid;grid-template-columns:repeat(auto-fill,minmax(112px,1fr));gap:12px}
.cell{border-radius:18px;padding:12px;text-align:center;border:1px solid rgba(255,255,255,.1);background:linear-gradient(160deg,rgba(255,255,255,.09),rgba(255,255,255,.02));box-shadow:inset 0 1px 0 rgba(255,255,255,.15)}
.cell img{width:56px;height:56px;border-radius:10px;background:#000;display:block;margin:0 auto 8px;image-rendering:auto}
.cell b{display:block;font:700 22px var(--mono);color:var(--white)}
.cell small{display:block;color:var(--ash);font-size:12px;margin:2px 0 8px}
.cell .track{height:5px;border-radius:9px;background:rgba(255,255,255,.1);overflow:hidden}
.cell .fill{height:100%;border-radius:9px;background:linear-gradient(90deg,#8a9097,#fff)}
.cell.low b{color:var(--ash)}

/* ---------- single letter tab ---------- */
.two{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.big{font:700 120px/1 var(--mono);text-align:center;padding:16px 0 22px;background:linear-gradient(180deg,#fff,#8e949b);-webkit-background-clip:text;background-clip:text;color:transparent}
.bars{display:grid;gap:10px}
.row{display:grid;grid-template-columns:34px 1fr 52px;align-items:center;gap:12px;font-size:13px}
.row b{font:700 17px var(--mono);color:var(--white)}
.row .track{height:9px;border-radius:9px;background:rgba(255,255,255,.1);overflow:hidden}
.row .fill{height:100%;border-radius:9px;background:linear-gradient(90deg,#6b7078,#f3f5f7);transition:width .5s cubic-bezier(.2,.8,.2,1)}
.row span{text-align:right;color:var(--ash)}

footer{text-align:center;color:var(--ash-dark);font-size:13px;margin-top:6px}

/* ---------- picture tab ---------- */
.drop{border:1.5px dashed rgba(255,255,255,.25);border-radius:22px;padding:42px 20px;text-align:center;cursor:pointer;background:rgba(0,0,0,.35);transition:.2s}
.drop:hover,.drop.over{border-color:#fff;background:rgba(255,255,255,.07)}
.drop p{color:var(--white);font:600 16px var(--heading);margin-bottom:6px}
.drop small{color:var(--ash)}
.photo{position:relative;margin-top:16px;border-radius:22px;overflow:hidden;background:#000;box-shadow:inset 0 0 0 1px rgba(255,255,255,.12)}
.photo img{display:block;width:100%;height:auto}

@media(max-width:820px){
  .two{grid-template-columns:1fr}
  .card{padding:18px}
  .big{font-size:90px}
}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}