.solver-side-input::placeholder{color:#d1d5db;opacity:.6}.solver-side-input:focus{border-color:#3b82f6;outline:none;box-shadow:0 0 0 3px #3b82f61a}.filter-tab{cursor:pointer;-webkit-user-select:none;user-select:none}.solution-item{background:#fff;border:2px solid #e5e7eb;border-radius:12px;margin-bottom:16px;padding:20px}.solution-item.optimal{background:linear-gradient(90deg,#f0fdf4,#dcfce7);border-color:#10b981}.solution-words{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.solution-word{color:#fff;background:#3b82f6;border-radius:8px;padding:8px 16px;font-size:18px;font-weight:600}.solution-arrow{color:#9ca3af;font-weight:700}