@import url('/assets/fonts/fonts.css');
*{box-sizing:border-box}body{margin:0;background:#f5f7f8;color:#183e50;font-family:'DM Sans',sans-serif}header{display:flex;justify-content:space-between;padding:18px 4%;border-bottom:1px solid #cbd7dd}a{color:inherit}main{max-width:1150px;margin:auto;padding:24px}h1{font:700 36px Literata,serif}.eyebrow{font-size:12px;letter-spacing:2px}button{font:inherit;color:inherit;background:white;border:1px solid #8ca2ae;border-radius:8px;min-height:44px;padding:12px;cursor:pointer}button:focus-visible,a:focus-visible{outline:3px solid #dca521;outline-offset:3px}#modes{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}#modes button{text-align:left;padding:24px}#modes strong{display:block;font-size:21px;margin-bottom:8px}.toolbar{display:flex;gap:12px}#mat{border:3px solid #202020;padding:22px;background:white}#equation{text-align:center;font-size:32px}#guide{background:#eaf3f5;padding:16px;border-radius:8px}.layout{display:grid;grid-template-columns:175px minmax(0,1fr);gap:24px}#supply{display:grid;grid-template-columns:1fr 1fr;gap:12px}.tile{border:2px solid;font-size:20px;font-weight:bold;touch-action:none;user-select:none;min-width:48px;height:48px;padding:7px;border-radius:5px;display:inline-flex;align-items:center;justify-content:center}.tile.x{min-width:68px}.positive{background:#e6f5e5;border-color:#39854a;color:#256335}.negative{background:#fff0ef;border-color:#cf4545;color:#b12828}.selected{outline:3px solid #dca521;outline-offset:3px}.tile:disabled{opacity:.85;cursor:default}.small{font-size:13px;line-height:1.5}#groups{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.group{border:2px dashed #98a7ad;border-radius:12px;padding:12px;background:#f5f5f5;min-height:155px}.group.complete{border:2px solid #4d995a;box-shadow:0 0 6px #46945140}.group-heading{display:block;width:100%;background:transparent;border:0;text-align:left;padding:0 0 10px}.tile-row{display:flex;gap:8px;flex-wrap:wrap}.empty{border:2px dotted #abb3b5;color:#718086;background:transparent}.bins{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:20px}.bin{border:2px dashed #91a4ad;border-radius:12px;padding:12px;min-height:150px}.bin>button{width:100%;margin-bottom:12px}.bin h3{font-size:18px;margin:0}#result{margin-top:22px;background:#edf8ef;border:2px solid #469452;border-radius:10px;padding:18px;text-align:center}#result strong{font-size:28px;display:block;margin-top:12px}#feedback{min-height:24px}#next{background:#285e48;color:white}.ghost{position:fixed;z-index:20;pointer-events:none;opacity:.8}[hidden]{display:none!important}@media(max-width:650px){main{padding:12px}.layout{grid-template-columns:1fr}#supply{grid-template-columns:repeat(4,1fr)}aside h3{margin:0 0 12px}#mat{padding:12px}#groups{gap:10px}.tile.x{min-width:54px}.tile{min-width:44px}.group{padding:8px}#modes{grid-template-columns:1fr}.bins{gap:8px}#equation{font-size:26px}}