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button{width:min(150px,20%);height:70px;border:0;background:transparent;color:#777;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;font-size:12px}nav button.active{color:#111;font-weight:800}nav button:disabled,.card:disabled{opacity:.45;cursor:default}@media(max-width:850px){.mini-board{display:none}.cards{grid-template-columns:1fr}.game-layout{grid-template-columns:1fr}.tutor{position:static}.board{width:min(92vw,680px)}.hero{padding:26px}.hero h1{letter-spacing:-1px}.game-layout{padding:14px 10px}.board-card{padding:10px}.tutor{margin-bottom:15px}}@media(max-width:480px){header{height:60px;padding:0 12px}.brand small{display:none}.home,.lesson{padding:18px 12px}.hero{border-radius:18px}.hero h1{font-size:36px}.game-actions button{font-size:13px}}