:root{--panda:#2b2b2b;--accent:#ff8c42;--bg:#fff8f0}
body{font-family:Inter,system-ui,Arial;background:var(--bg);margin:0;color:var(--panda)}
.header{padding:12px;background:linear-gradient(90deg,#ffe8d6,#fff);box-shadow:0 2px 6px rgba(0,0,0,0.05)}
.container{display:flex;gap:20px;padding:20px;max-width:1100px;margin:20px auto}
.left{flex:1}
.right{width:260px}
.grid{display:grid;gap:8px}
.tile{width:40px;height:40px;border-radius:8px;background:#f0f0f0;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .12s}
.tile.on{background:var(--panda);box-shadow:inset 0 -4px 0 rgba(0,0,0,0.08)}
.tile.preview{outline:3px solid rgba(255,140,66,0.35);transform:scale(1.05)}
.toolbar{margin-top:12px;display:flex;gap:8px;flex-wrap:wrap}
.actbtn{padding:8px 12px;border-radius:8px;border:0;background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.06);cursor:pointer}
.actbtn.active{background:var(--accent);color:#222}
.hero{max-width:1100px;margin:24px auto;padding:20px;background:linear-gradient(180deg,#fff,#f8f9fb);border-radius:10px;box-shadow:0 6px 20px rgba(0,0,0,0.04)}
.hero-inner{display:flex;gap:20px;align-items:center;flex-wrap:wrap}
.hero-left{flex:1;min-width:260px}
.hero-left h2{margin:0 0 8px 0}
.hero-left p{margin:0 0 12px 0;color:#444}
.hero-left ul{margin:0 0 12px 18px;color:#555}
.hero-tips{width:280px;min-width:200px}
.tips-box{background:#fff;border-radius:8px;padding:12px;border:1px solid #eee}
.tips-list{margin:8px 0 0 16px;color:#555}
.mini-grid-preview{max-width:160px;overflow:hidden}
/* inner grid emitted by GridRenderer */
.mini-grid-inner{display:grid;gap:4px}
.mini-grid-inner .cell{width:14px;height:14px;border-radius:3px}
.mini-grid-inner .cell.on{background:#222}
.mini-grid-inner .cell.off{background:#eee}
/* per-size column templates (keeps renderer simple) */
.mini-grid-inner[data-size="3"]{grid-template-columns:repeat(3,14px)}
.mini-grid-inner[data-size="4"]{grid-template-columns:repeat(4,14px)}
.mini-grid-inner[data-size="5"]{grid-template-columns:repeat(5,14px)}
.mini-grid-inner[data-size="6"]{grid-template-columns:repeat(6,14px)}
.mini-grid-inner[data-size="7"]{grid-template-columns:repeat(7,14px)}
.mini-grid-inner[data-size="8"]{grid-template-columns:repeat(8,14px)}

.level-card{border:1px solid #eee;border-radius:10px;padding:12px;background:#fff;box-shadow:0 4px 12px rgba(0,0,0,0.04)}
@media(max-width:800px){.container{flex-direction:column}.right{width:auto}}

/* level page helpers */
.topbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}
.topbar-left{display:flex;gap:12px;align-items:center}
.back-link{text-decoration:none;color:inherit;border:1px solid #eee;padding:6px;border-radius:6px}

.modal-backdrop{display:none;position:fixed;inset:0;background:rgba(0,0,0,0.45);align-items:center;justify-content:center}
.modal-backdrop.show{display:flex}
.modal-content{background:#fff;padding:20px;border-radius:10px;min-width:320px;max-width:90%;box-shadow:0 8px 24px rgba(0,0,0,0.2)}
.label-block{display:block;margin-top:8px}
.hs-input{width:100%;padding:8px;margin-top:6px;border:1px solid #ddd;border-radius:6px}
.hs-actions{display:flex;gap:8px;justify-content:flex-end;margin-top:12px}
.hs-submit{background:var(--accent);color:#222}
.hs-msg{margin-top:8px;color:green;display:none}

@media(max-width:600px){
  .hero-inner{flex-direction:column;align-items:stretch}
  .hero-tips{width:auto;min-width:0}
  .hero-left .actbtn{display:block}
  /* scale down the mini-grid previews since their inner cells are inline-sized */
  .mini-grid-preview{max-width:120px;transform:scale(0.8);transform-origin:left top}
}

/* responsive tweaks for small devices */
@media(max-width:600px){
  .hero-inner{flex-direction:column;align-items:stretch}
  .hero-tips{width:auto;min-width:0}
  .hero-left .actbtn{display:block}
  /* scale down the mini-grid previews since their inner cells are inline-sized */
  .mini-grid-preview{max-width:120px;transform:scale(0.8);transform-origin:left top}
}

/* Levels grid */
.levels-grid{width:100%;max-width:1100px;margin:24px auto;display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}
.level-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.level-header .title{font-weight:600}
.level-header .size{color:#666;font-size:13px}
.level-row{display:flex;gap:8px;align-items:center;margin-bottom:8px}
.level-actions{display:flex;justify-content:space-between;align-items:center;margin-top:8px}
.level-actions .plays{color:#666;font-size:13px}