:root{
  --bg:#0b0d14; --panel:#141826; --panel2:#1b2030; --line:#2a3147;
  --ink:#e9edf6; --dim:#9aa6c0; --accent:#ffd479; --accent2:#7db4ff;
}
*{box-sizing:border-box}
html,body{margin:0}
body{
  background:var(--bg); color:var(--ink);
  font:16px/1.4 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  -webkit-text-size-adjust:100%;
  padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}
[hidden]{display:none!important}

.topbar{padding:18px 16px 6px}
.topbar h1{margin:0;font-size:22px;letter-spacing:.3px}
.tagline{margin:4px 0 0;color:var(--dim);font-size:13px}
.howto{display:inline-block;margin-top:8px;padding:6px 12px;border-radius:8px;
  background:var(--panel2);border:1px solid var(--line);color:var(--accent2);
  text-decoration:none;font-size:13px;font-weight:600}
.howto:hover{background:var(--panel)}

main{max-width:760px;margin:0 auto;padding:12px 16px 32px;display:flex;flex-direction:column;gap:16px}

.controls{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:14px;display:flex;flex-direction:column;gap:12px}
.row{display:flex;flex-direction:column;gap:6px}
.row.two{flex-direction:row;gap:12px}
.row.two>div{flex:1;display:flex;flex-direction:column;gap:6px}
label{font-size:12px;color:var(--dim);font-weight:600;letter-spacing:.3px}

input[type=text],input:not([type]),select,#targetInput{
  width:100%;background:var(--panel2);color:var(--ink);
  border:1px solid var(--line);border-radius:10px;padding:11px 12px;font-size:16px;
}
.findline{display:flex;gap:8px}
.findline #targetInput{flex:1}

button{
  border:0;border-radius:10px;padding:11px 14px;font-size:15px;font-weight:600;
  background:var(--panel2);color:var(--ink);cursor:pointer;border:1px solid var(--line);
}
button.primary{background:var(--accent);color:#1a1300;border-color:var(--accent)}
button.ghost{background:transparent}
button:disabled{opacity:.4;cursor:default}

.status{margin:0;min-height:18px;font-size:13px;color:var(--accent2)}
.note{margin:0;font-size:12px;color:var(--dim)}

.stage{display:flex;flex-direction:column;gap:8px}
.viewer{
  position:relative;width:100%;aspect-ratio:1/1;background:#05070d;
  border:1px solid var(--line);border-radius:14px;overflow:hidden;
  touch-action:none;
}
.viewer img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;user-select:none;-webkit-user-drag:none}
#dustImg{filter:url(#dustStretch)}
#userImg{transform-origin:center center}
.placeholder{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:var(--dim);text-align:center;padding:24px;font-size:14px}

.solved-banner{background:#1f8a45;color:#eaffef;font-weight:800;letter-spacing:.3px;text-align:center;
  padding:14px;border-radius:12px;font-size:17px;border:1px solid #34c46e;
  box-shadow:0 0 0 3px rgba(52,196,110,.18);animation:solvedpop .35s ease}
@keyframes solvedpop{from{transform:scale(.95);opacity:.2}to{transform:scale(1);opacity:1}}
.finetune{display:flex;align-items:center;gap:10px}
.finetune #flipBtn{flex:0 0 auto;padding:9px 14px}
.finetune .rotctl{flex:1;display:flex;align-items:center;gap:8px;font-size:12px;color:var(--dim);font-weight:600}
.finetune .rotctl input[type=range]{flex:1}
.layertoggle{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.lt-label{font-size:12px;color:var(--dim);font-weight:600}
.seg{flex:1;padding:9px;font-size:14px}
.seg.active{background:var(--accent2);color:#001226;border-color:var(--accent2)}
.blink-main{width:100%;background:var(--accent);color:#1a1300;border-color:var(--accent);font-size:16px;padding:13px}
.blink-main:disabled{background:var(--panel2);color:var(--ink)}
.viewerctl{display:flex;gap:14px;flex-wrap:wrap}
.ctl{display:flex;flex-direction:column;gap:4px;flex:1;min-width:180px;font-size:12px;color:var(--dim);font-weight:600}
input[type=range]{width:100%;accent-color:var(--accent)}

.compare details{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:0 14px}
.compare summary{cursor:pointer;padding:14px 0;font-weight:600;list-style:none}
.compare summary::-webkit-details-marker{display:none}
.compare summary::before{content:"▸ ";color:var(--accent)}
.compare details[open] summary::before{content:"▾ "}
.compare details>*:not(summary){margin-bottom:14px}
.compare .row.two,.compare .row{margin-top:0}

.solvebox{background:var(--panel2);border:1px solid var(--line);border-radius:10px;padding:12px;display:flex;flex-direction:column;gap:10px}
.solvebox a{color:var(--accent2)}
.warn-note{margin:0;padding:8px 10px;font-size:12px;color:#f0b25b;
  background:rgba(240,178,91,.08);border:1px solid rgba(240,178,91,.35);border-radius:8px;line-height:1.4}
#solveStatus{min-height:16px;color:var(--accent2)}
.keysaved{flex-direction:row!important;align-items:center;justify-content:space-between;gap:10px}
.keysaved .note{color:var(--accent2)}
.keysaved button{padding:7px 12px;font-size:13px}

.foot{display:flex;flex-direction:column;align-items:center;gap:12px;text-align:center;
  padding:22px 16px 30px;margin-top:8px;border-top:1px solid var(--line);color:var(--dim)}
.foot-links{display:flex;gap:10px;flex-wrap:wrap;justify-content:center}
.foot-btn{display:inline-block;background:var(--panel2);color:var(--ink);border:1px solid var(--line);
  border-radius:10px;padding:11px 18px;text-decoration:none;font-weight:600;font-size:14px}
.foot-btn.primary{background:var(--accent);color:#1a1300;border-color:var(--accent)}
.foot-credit{margin:0;font-size:12px;color:var(--dim);max-width:440px;line-height:1.5}
.foot-credit a{color:var(--accent2);text-decoration:none}
.foot-ver{font-size:11px;opacity:.55}