:root{
  --paper:#F3F7F2; --ink:#173D2E; --leaf:#3FA34D; --leaf-dark:#2C7A39;
  --sap:#F5C542; --pink:#E8378F; --wall:#CFE3D2; --soft:#E6EFE7; --muted:#5F7A6B;
}
*{box-sizing:border-box}
html,body{margin:0;background:var(--paper);color:var(--ink);
  font-family:"Nunito","Avenir Next",ui-rounded,system-ui,-apple-system,sans-serif;font-size:17px;line-height:1.45}
button{font:inherit;cursor:pointer;border:0;border-radius:14px}
input{font:inherit}
a{color:inherit;text-decoration:none}
.wrap{max-width:560px;margin:0 auto;padding:18px 16px 40px}

/* header */
header.home{text-align:center;padding:22px 0 8px}
header.home h1{font-size:28px;margin:0;font-weight:900}
.topbar{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.back{background:var(--soft);color:var(--ink);font-weight:800;padding:8px 14px;border-radius:12px}
.topbar h1{font-size:22px;margin:0;font-weight:800;flex:1}
.tab{background:none;color:var(--muted);font-weight:700;padding:6px 10px;border-radius:10px}
.tab.on{background:var(--wall);color:var(--ink)}

/* menu tiles */
.menu{display:grid;gap:14px;margin-top:18px}
.tile{display:flex;gap:14px;align-items:flex-start;background:#fff;border:2px solid var(--wall);
  border-radius:22px;padding:18px;transition:transform .08s ease,border-color .08s ease}
.tile:active{transform:scale(.99)}
.tile.subject{border-color:var(--leaf)}
.tile.game{border-color:var(--pink)}
.tile.soon{opacity:.6}
.tile-emoji{font-size:34px;line-height:1}
.tile-body{flex:1}
.tile-body h2{margin:0 0 4px;font-size:20px;font-weight:800}
.tile-body p{margin:0 0 10px;color:var(--muted);font-size:15px}
.tile-meta{font-size:13px;color:var(--muted);font-weight:700}
.chip{background:var(--pink);color:#fff;font-size:12px;padding:2px 8px;border-radius:999px;vertical-align:middle}

/* shared bits */
.card{background:#fff;border:2px solid var(--wall);border-radius:22px;padding:18px}
.cellwall{border:6px double var(--wall);border-radius:26px;padding:14px;background:#fff}
.topic{font-size:13px;color:var(--muted);font-weight:700}
.q{font-size:20px;font-weight:800;margin:6px 0 14px;line-height:1.3}
.count{font-size:13px;color:var(--muted);text-align:right}
.in{width:100%;padding:12px 14px;border:2px solid var(--wall);border-radius:14px;background:var(--paper);outline:none}
.in:focus{border-color:var(--leaf)}
.opts{display:grid;gap:8px}
.opt{background:var(--paper);border:2px solid var(--wall);padding:12px 14px;text-align:left;font-weight:700}
.opt:focus-visible,.btn:focus-visible{outline:3px solid var(--sap)}
.btn{background:var(--leaf);color:#fff;font-weight:800;padding:13px 18px;width:100%;margin-top:12px}
.btn.quiet{background:var(--soft);color:var(--ink)}
.btn.pink{background:var(--pink)}
.fb{margin-top:12px;padding:12px 14px;border-radius:14px;font-weight:700}
.fb.ok{background:#E3F4E5;color:var(--leaf-dark)}
.fb.no{background:#FBE4EF;color:#9C1F5E}
.fb small{display:block;font-weight:600;margin-top:4px;color:var(--ink)}
.big{font-size:44px;font-weight:900;line-height:1;margin:6px 0}
.bar{height:12px;background:var(--soft);border-radius:8px;overflow:hidden;margin:6px 0 2px}
.bar i{display:block;height:100%;background:var(--leaf);border-radius:8px;transition:width .4s ease}
.row{display:flex;justify-content:space-between;align-items:baseline;font-weight:700}
.row span{color:var(--muted);font-size:14px;font-weight:600}
.weak{margin:8px 0 0;padding:0;list-style:none}
.weak li{padding:8px 0;border-top:1px solid var(--soft);font-size:15px}
.weak li b{color:var(--pink)}
.hist{font-size:14px;color:var(--muted);margin-top:8px}
.stack>*+*{margin-top:12px}
.lead{color:var(--muted);margin:0 0 12px}
.foot,.note{font-size:13px;color:var(--muted);text-align:center;margin-top:20px}