:root{--blue: #1a56db;--blue-dark: #1e3a8a;--red: #dc2626;--yellow: #eab308;--dark: #111827;--gray: #6b7280;--light: #f9fafb;--cell-empty: #e5e7eb}*{box-sizing:border-box;margin:0;padding:0}html,body{height:100%}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:linear-gradient(135deg,var(--blue) 0%,var(--blue-dark) 100%);color:var(--dark);min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px 16px}#app{width:100%;max-width:560px}.start-screen{background:var(--light);border-radius:16px;padding:32px 24px;box-shadow:0 20px 60px #00000040;text-align:center}.start-screen h1{font-size:2.25rem;color:var(--blue);margin-bottom:6px}.start-screen .subtitle{color:var(--gray);margin-bottom:24px}.opponent-picker{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:20px}.opponent-btn{padding:12px 14px;border-radius:10px;border:2px solid #d1d5db;background:#fff;font-size:.95rem;font-weight:500;color:var(--dark);cursor:pointer;transition:transform .08s ease,border-color .12s,background .12s}.opponent-btn:hover{border-color:var(--blue)}.opponent-btn.selected{background:var(--blue);border-color:var(--blue);color:#fff}.order-row{display:flex;gap:10px;align-items:center;justify-content:center;margin-bottom:14px}.order-row label{color:var(--dark);font-weight:500}.order-btns{display:flex;gap:8px}.order-btn{padding:8px 14px;border-radius:8px;border:2px solid #d1d5db;background:#fff;color:var(--dark);font-size:.92rem;font-weight:600;cursor:pointer;transition:border-color .12s,background .12s}.order-btn:hover{border-color:var(--blue)}.order-btn.selected{background:var(--blue);border-color:var(--blue);color:#fff}.sims-row{display:flex;gap:10px;align-items:center;justify-content:center;margin-bottom:20px}.sims-row label{color:var(--dark);font-weight:500}.sims-row select{padding:8px 12px;border-radius:8px;border:2px solid #d1d5db;background:#fff;font-size:.95rem;cursor:pointer}.start-btn{display:inline-block;padding:14px 36px;border-radius:10px;border:none;background:var(--yellow);color:var(--dark);font-size:1.05rem;font-weight:700;cursor:pointer;transition:transform .08s ease,filter .12s}.start-btn:hover:not(:disabled){filter:brightness(1.08)}.start-btn:active:not(:disabled){transform:translateY(1px)}.start-btn:disabled{opacity:.65;cursor:default}.game-root{background:var(--light);border-radius:16px;padding:24px 20px;box-shadow:0 20px 60px #00000040}.game-wrapper{display:flex;flex-direction:column;align-items:center}.status{font-size:1.1rem;font-weight:600;margin-bottom:16px;min-height:1.6em;text-align:center}.status-info{color:var(--dark)}.status-thinking{color:var(--gray);font-style:italic}.status-win{color:var(--blue);font-size:1.35rem}.status-draw{color:var(--gray);font-size:1.25rem}.board{display:grid;gap:6px;background:var(--blue);padding:10px;border-radius:12px;width:100%;max-width:480px;aspect-ratio:7 / 6;box-shadow:0 8px 24px #00000040}.column{display:grid;grid-template-rows:repeat(6,1fr);gap:6px;cursor:default;border-radius:6px;transition:background .12s}.clickable .column{cursor:pointer}.clickable .column:hover{background:#ffffff14}.cell{width:100%;aspect-ratio:1 / 1;border-radius:50%;background:var(--cell-empty);transition:background .15s}.cell.yellow{background:var(--yellow)}.cell.red{background:var(--red)}@keyframes drop-in{0%{transform:translateY(-600%)}85%{transform:translateY(6%)}to{transform:translateY(0)}}.cell.drop{animation:drop-in .25s ease-out}.restart{margin-top:18px;padding:10px 24px;border-radius:10px;border:none;background:var(--blue);color:#fff;font-size:1rem;font-weight:600;cursor:pointer}.restart:hover{filter:brightness(1.1)}@media (max-width: 480px){.start-screen h1{font-size:1.75rem}.opponent-picker{grid-template-columns:1fr}}