/* Colour By Numbers — tablet-first, warm paper palette, big touch targets. */

:root{
  --paper:#f7f4ee;
  --card:#ffffff;
  --ink:#2c313c;
  --muted:#6b7280;
  --line:#e4ded2;
  --accent:#e07a3f;
  --accent-dark:#c2410c;
  --shadow:0 2px 10px rgba(43,38,28,.10);
  --bar-h:56px;
  --pal-h:86px;
}

*{box-sizing:border-box}
html,body{height:100%;margin:0}
body{
  font:16px/1.45 "Segoe UI",system-ui,-apple-system,Roboto,sans-serif;
  color:var(--ink);
  background:var(--paper);
  overscroll-behavior:none;
  -webkit-tap-highlight-color:transparent;
}
button{font:inherit;color:inherit;cursor:pointer}
.hidden{display:none !important}
.muted{color:var(--muted)}
.spacer{flex:1}

/* ---------- app frame ---------- */
#app{position:fixed;inset:0;display:flex;flex-direction:column}

#bar{
  height:var(--bar-h);flex:0 0 auto;display:flex;align-items:center;gap:6px;
  padding:0 8px;background:#fffdf9;border-bottom:1px solid var(--line);
  padding-top:env(safe-area-inset-top);
  height:calc(var(--bar-h) + env(safe-area-inset-top));
}
#titlewrap{min-width:0;max-width:38vw}
#title{font-weight:650;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
#progress{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--muted)}
#barTrack{display:block;flex:1;min-width:60px;height:6px;border-radius:99px;background:#ece6da;overflow:hidden}
#barFill{display:block;height:100%;width:0;border-radius:99px;background:linear-gradient(90deg,#f0a35e,#e07a3f);transition:width .25s ease}

.icon{
  width:42px;height:42px;flex:0 0 auto;border:1px solid var(--line);border-radius:12px;
  background:#fff;font-size:20px;line-height:1;display:grid;place-items:center;box-shadow:var(--shadow)
}
.pill{
  height:42px;padding:0 14px;border:1px solid var(--line);border-radius:12px;background:#fff;
  font-size:14px;font-weight:600;white-space:nowrap;box-shadow:var(--shadow)
}
.icon:active,.pill:active{transform:translateY(1px)}
.pill.on{background:var(--accent);border-color:var(--accent);color:#fff}

#stage{flex:1;position:relative;overflow:hidden;background:
  radial-gradient(120% 90% at 50% 0%,#fffdf8 0%,#f2ece1 100%)}
#board{position:absolute;inset:0;width:100%;height:100%;display:block}

/* the original picture, kept in the corner to colour from */
#ref{
  position:absolute;right:12px;bottom:12px;margin:0;width:min(30vw,220px);
  background:#fffdf9;border:1px solid var(--line);border-radius:14px;padding:6px 6px 2px;
  box-shadow:0 8px 26px rgba(20,16,10,.22);cursor:pointer;transition:width .18s ease
}
#ref.big{width:min(78vw,620px)}
#ref img{width:100%;display:block;border-radius:9px}
#ref figcaption{font-size:10px;color:var(--muted);text-align:center;padding:3px 0 2px}

/* ---------- palette strip ---------- */
#palette{
  flex:0 0 auto;height:var(--pal-h);display:flex;gap:8px;align-items:center;
  padding:8px 10px calc(8px + env(safe-area-inset-bottom));
  background:#fffdf9;border-top:1px solid var(--line);
  overflow-x:auto;overflow-y:hidden;scrollbar-width:thin;
}
.swatch{
  position:relative;flex:0 0 auto;width:62px;height:66px;border-radius:14px;border:2px solid var(--line);
  background:#fff;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;
  padding:4px;box-shadow:var(--shadow);transition:transform .12s ease,border-color .12s ease
}
.swatch i{display:block;width:34px;height:26px;border-radius:8px;border:1px solid rgba(0,0,0,.14)}
.swatch b{font-size:15px;font-weight:750;line-height:1}
.swatch em{position:absolute;top:2px;right:6px;font-style:normal;font-size:10px;color:var(--muted)}
.swatch.active{border-color:var(--accent);transform:translateY(-4px) scale(1.05)}
.swatch.done{opacity:.42}
.swatch.done em{color:#16a34a;font-weight:700}
@keyframes hintflash{0%,100%{box-shadow:var(--shadow)}30%{box-shadow:0 0 0 4px rgba(224,122,63,.55)}}
.swatch.hintflash{animation:hintflash .7s ease 2}

/* ---------- overlays ---------- */
.overlay{position:fixed;inset:0;z-index:20;overflow:auto;background:var(--paper)}
.overlay.dim{background:rgba(35,31,25,.55);display:grid;place-items:center;overflow:hidden}
.overlay.clear{background:rgba(35,31,25,.28);display:block}

.sheetbox{max-width:980px;margin:0 auto;padding:28px 20px 60px}
.sheetbox h1{font-size:30px;margin:6px 0 6px}
.sheetbox h2{font-size:17px;margin:26px 0 10px;color:#4b5262}
.lead{max-width:62ch;color:var(--muted);margin:0 0 18px}
.tip{margin-top:28px;color:var(--muted);font-size:14px}
.build{float:right;font-size:11px;opacity:.7;font-variant-numeric:tabular-nums}

.row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.settings{background:#fffdf9;border:1px solid var(--line);border-radius:16px;padding:14px;box-shadow:var(--shadow)}
.settings label{display:flex;flex-direction:column;gap:4px;font-size:12px;color:var(--muted);font-weight:600}
.settings select{
  height:40px;min-width:170px;border:1px solid var(--line);border-radius:10px;background:#fff;
  padding:0 10px;font-size:14px;color:var(--ink)
}
.settings .check{flex-direction:row;align-items:center;gap:8px;font-size:14px;color:var(--ink);font-weight:500}
.settings .check input{width:20px;height:20px}

/* the colouring-book shelf: three big rounded cards across, artwork first */
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
@media (min-width:1150px){ .grid3{grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px} }

.tile{
  position:relative;display:block;padding:0;border:1px solid var(--line);border-radius:18px;
  background:#fff;overflow:hidden;box-shadow:var(--shadow);cursor:pointer;
  transition:transform .16s ease, box-shadow .16s ease
}
.tile:active{transform:scale(.97)}
.tile:hover{box-shadow:0 6px 20px rgba(43,38,28,.16)}
.tile img{width:100%;aspect-ratio:1/1;object-fit:cover;display:block;background:#fffdfb}
.tile .cap{
  position:absolute;left:0;right:0;bottom:0;padding:14px 8px 6px;font-size:11.5px;font-weight:600;
  color:#fff;text-align:left;background:linear-gradient(transparent,rgba(20,16,10,.62));
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis
}
.tile.blank .cap{color:#5b5245;background:linear-gradient(transparent,rgba(255,253,248,.9))}
.tile .tick{
  position:absolute;top:8px;right:8px;width:30px;height:30px;border-radius:50%;
  background:#fff;display:grid;place-items:center;box-shadow:0 2px 8px rgba(20,16,10,.28)
}
.tile .tick svg{width:20px;height:20px}
.tile .prog{
  position:absolute;top:8px;right:8px;padding:3px 8px;border-radius:99px;font-size:11px;
  font-weight:700;color:#fff;background:rgba(224,122,63,.92);box-shadow:0 2px 8px rgba(20,16,10,.25)
}
.tile .barw{position:absolute;left:0;right:0;bottom:0;height:4px;background:rgba(20,16,10,.10)}
.tile .barw i{display:block;height:100%;background:var(--accent)}
.tile .del{
  position:absolute;top:8px;left:8px;width:26px;height:26px;border-radius:8px;border:none;
  background:rgba(20,18,15,.5);color:#fff;font-size:16px;line-height:1
}

/* category strip */
.tabs{
  display:flex;gap:8px;overflow-x:auto;padding:4px 2px 10px;margin:0 -2px;
  scrollbar-width:none;-ms-overflow-style:none
}
.tabs::-webkit-scrollbar{display:none}
.tab{
  flex:0 0 auto;height:34px;padding:0 14px;border-radius:99px;border:1px solid var(--line);
  background:#fff;font-size:13px;font-weight:600;color:#6b7280;white-space:nowrap
}
.tab.on{background:var(--ink);border-color:var(--ink);color:#fff}

#settingsBox{
  background:#fffdf9;border:1px solid var(--line);border-radius:16px;padding:2px 14px;
  box-shadow:var(--shadow);margin-bottom:18px
}
#settingsBox summary{
  cursor:pointer;padding:12px 2px;font-weight:650;font-size:14px;color:#4b5262;list-style:none
}
#settingsBox summary::-webkit-details-marker{display:none}
#settingsBox summary::before{content:'⚙ ';opacity:.7}
#settingsBox .settings{background:none;border:none;box-shadow:none;padding:0 0 14px}

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px}
.cathead{
  grid-column:1/-1;margin:14px 0 -2px;font-size:13px;font-weight:700;letter-spacing:.06em;
  text-transform:uppercase;color:#8b8578
}
.cathead:first-child{margin-top:0}
.card{
  position:relative;border:1px solid var(--line);border-radius:16px;background:var(--card);
  padding:8px;text-align:left;display:flex;flex-direction:column;gap:6px;box-shadow:var(--shadow);
  cursor:pointer;overflow:hidden
}
.card img{width:100%;aspect-ratio:1/1;object-fit:cover;border-radius:10px;background:#eee;display:block}
.card span{font-size:13px;font-weight:600;padding:0 2px}
.card .sub{font-weight:400;font-size:11px;color:var(--muted)}
.card .mini{height:5px;border-radius:99px;background:#ece6da;overflow:hidden;margin:0 2px 2px}
.card .mini i{display:block;height:100%;background:var(--accent)}
.card .redo{
  position:absolute;top:10px;right:44px;width:28px;height:28px;border-radius:8px;border:none;
  background:rgba(20,18,15,.55);color:#fff;font-size:15px;line-height:1
}
.card .del{
  position:absolute;top:10px;right:10px;width:28px;height:28px;border-radius:8px;border:none;
  background:rgba(20,18,15,.55);color:#fff;font-size:18px;line-height:1
}
.card:active{transform:translateY(1px)}

.big{
  height:52px;padding:0 20px;border-radius:14px;border:1px solid var(--accent);
  background:var(--accent);color:#fff;font-weight:650;font-size:15px;box-shadow:var(--shadow)
}
.big.ghost{background:#fff;color:var(--ink);border-color:var(--line)}

.panel{
  background:#fffdf9;border-radius:20px;padding:26px 28px;max-width:520px;text-align:center;
  box-shadow:0 18px 50px rgba(20,16,10,.35);position:relative;z-index:2
}
.panel h2{margin:0 0 6px;font-size:24px}
.panel p{margin:0 0 16px;color:var(--muted)}
.panel .row{justify-content:center}
.track{width:280px;max-width:60vw;height:8px;border-radius:99px;background:#ece6da;overflow:hidden;margin:14px auto 0}
.track span{display:block;height:100%;width:2%;background:linear-gradient(90deg,#f0a35e,#e07a3f);transition:width .3s ease}
.spinner{
  width:38px;height:38px;margin:0 auto 12px;border-radius:50%;
  border:4px solid #eadfcd;border-top-color:var(--accent);animation:spin 1s linear infinite
}
@keyframes spin{to{transform:rotate(360deg)}}
#confetti{position:absolute;inset:0;width:100%;height:100%;z-index:1;pointer-events:none}

.menupanel{
  position:absolute;top:calc(var(--bar-h) + env(safe-area-inset-top) + 6px);right:10px;width:290px;
  background:#fffdf9;border:1px solid var(--line);border-radius:16px;padding:8px;
  box-shadow:0 14px 40px rgba(20,16,10,.28);display:flex;flex-direction:column
}
.menupanel button{
  text-align:left;padding:13px 12px;border:none;background:none;border-radius:10px;font-size:15px
}
.menupanel button:hover{background:#f4efe5}

/* ---------- small screens ---------- */
@media (max-width:720px){
  :root{--pal-h:80px}
  #titlewrap{max-width:30vw}
  #btnHint,#btnZoomIn,#btnZoomOut{display:none}
  .pill{padding:0 10px;font-size:13px}
  .sheetbox{padding:20px 14px 50px}
  .sheetbox h1{font-size:24px}
  .settings select{min-width:140px}
}
@media (max-width:420px){
  #progress{display:none}
}