:root{--bg:#f5f0e8;--fg:#1a1a1a;--accent:#7c3aed;--panel:#ffffff;--shadow:rgba(0,0,0,0.08);--neon:#39ff14;}
body.shadow-mode{--bg:#0a0a0a;--fg:#e0e0e0;--accent:#39ff14;--panel:#141414;--shadow:rgba(255,255,255,0.04);}
*{margin:0;padding:0;box-sizing:border-box;}
body{background:var(--bg);color:var(--fg);font-family:'Segoe UI',system-ui,sans-serif;transition:background .3s,color .3s;overflow-x:hidden;}
header{display:flex;justify-content:space-between;align-items:center;padding:16px 24px;background:var(--panel);box-shadow:0 2px 10px var(--shadow);position:sticky;top:0;z-index:100;}
h1{font-size:1.4rem;letter-spacing:3px;text-transform:uppercase;font-weight:700;}
.controls{display:flex;gap:10px;align-items:center;}
.icon-btn,.tool-btn{background:transparent;border:2px solid var(--accent);color:var(--accent);padding:6px 12px;border-radius:6px;cursor:pointer;font-size:1rem;transition:.2s;}
.icon-btn:hover,.tool-btn:hover{background:var(--accent);color:#fff;}
.tool-btn.active{background:var(--accent);color:#fff;}
.tool-btn.highlight{border-color:#ff0055;color:#ff0055;}
.tool-btn.highlight:hover{background:#ff0055;color:#fff;}
select{padding:6px 10px;border-radius:6px;border:1px solid var(--shadow);background:var(--panel);color:var(--fg);cursor:pointer;}
nav.tabs{display:flex;background:var(--panel);border-bottom:2px solid var(--shadow);}
.tab{flex:1;padding:14px 8px;border:none;background:transparent;color:var(--fg);cursor:pointer;text-transform:uppercase;font-size:.78rem;letter-spacing:1px;transition:.2s;}
.tab.active{border-bottom:3px solid var(--accent);font-weight:bold;color:var(--accent);}
.panel{display:none;padding:24px;min-height:70vh;animation:fadeIn .3s;}
.panel.active{display:block;}
@keyframes fadeIn{from{opacity:0;transform:translateY(8px);}to{opacity:1;transform:translateY(0);}}
.filter-bar{display:flex;gap:10px;margin-bottom:20px;flex-wrap:wrap;}
.filter{padding:8px 16px;border-radius:20px;border:1px solid var(--shadow);background:var(--panel);cursor:pointer;transition:.2s;font-size:.85rem;}
.filter.active{background:var(--accent);color:#fff;border-color:var(--accent);}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:18px;}
.card{background:var(--panel);border-radius:12px;overflow:hidden;box-shadow:0 4px 14px var(--shadow);cursor:pointer;transition:transform .25s,box-shadow .25s;border:1px solid transparent;}
.card:hover{transform:translateY(-5px);box-shadow:0 8px 24px var(--shadow);border-color:var(--accent);}
.card img{width:100%;height:150px;object-fit:cover;background:#111;display:block;}
.card .info{padding:14px;}
.card .title{font-weight:700;margin-bottom:6px;font-size:.95rem;}
.card .actions{display:flex;gap:8px;margin-top:10px;}
.btn-action{flex:1;padding:8px;border:none;border-radius:6px;background:var(--accent);color:#fff;cursor:pointer;font-size:.78rem;transition:.2s;}
.btn-action:hover{background:#5b21b6;}
.form-card{max-width:420px;background:var(--panel);padding:28px;border-radius:14px;box-shadow:0 4px 14px var(--shadow);margin:0 auto;}
.form-card h2{margin-bottom:18px;font-size:1.3rem;}
.form-card input{width:100%;padding:12px;margin:8px 0;border:2px solid var(--shadow);border-radius:8px;background:var(--bg);color:var(--fg);font-size:1rem;}
.form-card input:focus{outline:none;border-color:var(--accent);}
.btn-primary{width:100%;padding:14px;background:var(--accent);color:#fff;border:none;border-radius:8px;font-size:1rem;cursor:pointer;margin-top:12px;transition:.2s;}
.btn-primary:hover{background:#5b21b6;}
.preview-box{margin-top:24px;background:var(--panel);padding:20px;border-radius:12px;text-align:center;box-shadow:0 4px 14px var(--shadow);}
.preview-box.hidden{display:none;}
#svg-container{display:inline-block;max-width:100%;}
#svg-container svg{width:460px;height:460px;}
#workspace{display:flex;gap:16px;height:68vh;}
#toolbox{width:210px;background:var(--panel);padding:18px;border-radius:12px;box-shadow:0 4px 14px var(--shadow);overflow-y:auto;display:flex;flex-direction:column;gap:8px;}
#canvas-wrap{flex:1;background:var(--panel);border-radius:12px;box-shadow:0 4px 14px var(--shadow);display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden;}
#coloring-stage,#puzzle-stage{position:relative;width:100%;height:100%;display:flex;align-items:center;justify-content:center;}
#coloring-stage svg,#coloring-stage canvas,#coloring-stage img{max-width:92%;max-height:92%;position:absolute;transition:opacity .3s;}
#main-svg{z-index:2;cursor:pointer;}
#brush-canvas{z-index:3;pointer-events:all;touch-action:none;}
#base-image{z-index:1;}
.palette{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;margin-bottom:10px;}
.swatch{width:100%;height:32px;border-radius:5px;cursor:pointer;border:2px solid transparent;transition:transform .15s;}
.swatch.active{border-color:#fff;transform:scale(1.08);box-shadow:0 0 8px rgba(0,0,0,.3);}
input[type=range]{width:100%;margin:6px 0;accent-color:var(--accent);}
label{display:block;font-size:.72rem;opacity:.6;margin-top:6px;}
#puzzle-board{position:relative;width:100%;height:100%;perspective:1200px;}
.puzzle-piece{position:absolute;cursor:grab;box-shadow:4px 4px 12px rgba(0,0,0,.5);border:1px solid rgba(255,255,255,.12);transition:transform .12s;z-index:10;}
.puzzle-piece:active{cursor:grabbing;z-index:100;}
.puzzle-piece canvas{display:block;pointer-events:none;}
.puzzle-piece.solved{box-shadow:none;border:none;z-index:1 !important;transition:all .3s;}
#puzzle-timer{font-size:1.5rem;font-family:monospace;text-align:center;margin:12px 0;color:var(--accent);font-weight:bold;}
.hidden{display:none !important;}
@media(max-width:768px){
  h1{font-size:1.1rem;letter-spacing:1px;}
  #workspace{flex-direction:column;height:auto;min-height:60vh;}
  #toolbox{width:100%;flex-direction:row;flex-wrap:wrap;}
  #toolbox > div{width:auto;flex:1;min-width:140px;}
  .grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr));}
  #svg-container svg{width:300px;height:300px;}
}