.tool-header[data-astro-cid-jzabidmj]{text-align:center;margin-bottom:2rem}.tool-header[data-astro-cid-jzabidmj] h1[data-astro-cid-jzabidmj]{font-size:2rem;font-weight:700;margin-bottom:.5rem;color:var(--text-primary)}.tool-header[data-astro-cid-jzabidmj] p[data-astro-cid-jzabidmj]{color:var(--text-secondary);font-size:1rem;max-width:600px;margin:0 auto}.controls-card[data-astro-cid-jzabidmj]{background:var(--card-bg);border-radius:16px;padding:1.5rem;margin-bottom:1.5rem;box-shadow:var(--shadow-sm)}.control-row[data-astro-cid-jzabidmj]{display:flex;align-items:center;gap:1rem;margin-bottom:1rem;flex-wrap:wrap;justify-content:space-between}.control-row[data-astro-cid-jzabidmj]:last-child{margin-bottom:0}.label[data-astro-cid-jzabidmj]{font-weight:600;color:var(--text-primary)}.difficulty-buttons[data-astro-cid-jzabidmj]{display:flex;gap:.5rem;flex-wrap:wrap}.diff-btn[data-astro-cid-jzabidmj]{padding:.5rem 1rem;border-radius:8px;border:1px solid var(--border-color);background:var(--bg-secondary);color:var(--text-primary);cursor:pointer;font-size:.875rem;transition:all .2s}.diff-btn[data-astro-cid-jzabidmj]:hover{background:var(--bg-hover)}.diff-btn[data-astro-cid-jzabidmj].active{background:var(--accent-color);color:#fff;border-color:var(--accent-color)}.stats[data-astro-cid-jzabidmj]{display:flex;gap:2rem}.stat[data-astro-cid-jzabidmj]{text-align:center}.stat-label[data-astro-cid-jzabidmj]{display:block;font-size:.75rem;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em}.stat-value[data-astro-cid-jzabidmj]{display:block;font-size:1.5rem;font-weight:700;color:var(--text-primary);font-variant-numeric:tabular-nums}.pencil-toggle[data-astro-cid-jzabidmj]{display:flex;align-items:center;gap:.5rem}.toggle-btn[data-astro-cid-jzabidmj]{padding:.5rem 1rem;border-radius:8px;border:1px solid var(--border-color);background:var(--bg-secondary);color:var(--text-primary);cursor:pointer;font-size:.875rem;transition:all .2s}.toggle-btn[data-astro-cid-jzabidmj].active{background:var(--accent-color);color:#fff;border-color:var(--accent-color)}.action-row[data-astro-cid-jzabidmj]{display:flex;justify-content:center;gap:.75rem;flex-wrap:wrap}.board-container[data-astro-cid-jzabidmj]{display:flex;justify-content:center;margin-bottom:1.5rem}.sudoku-board[data-astro-cid-jzabidmj]{display:grid;grid-template-columns:repeat(9,1fr);gap:1px;background:var(--border-color);border:3px solid var(--text-primary);border-radius:8px;overflow:hidden}.cell[data-astro-cid-jzabidmj]{width:48px;height:48px;display:flex;align-items:center;justify-content:center;background:var(--bg-primary);font-size:1.5rem;font-weight:600;cursor:pointer;user-select:none;transition:background .15s;position:relative}@media(max-width:640px){.cell[data-astro-cid-jzabidmj]{width:36px;height:36px;font-size:1.2rem}}.cell[data-astro-cid-jzabidmj]:hover{background:var(--bg-hover)}.cell[data-astro-cid-jzabidmj].selected{background:var(--accent-color-soft, rgba(59,130,246,.2))}.cell[data-astro-cid-jzabidmj].highlighted{background:var(--accent-color-soft, rgba(59,130,246,.1))}.cell[data-astro-cid-jzabidmj].given{color:var(--text-primary);font-weight:700;background:var(--bg-secondary)}.cell[data-astro-cid-jzabidmj].user-value{color:var(--accent-color)}.cell[data-astro-cid-jzabidmj].error{color:#ef4444;background:#ef44441a}.cell[data-astro-cid-jzabidmj].hint{animation:hintFlash 1s ease;background:#22c55e4d}.cell[data-astro-cid-jzabidmj]:nth-child(3n):not(:nth-child(9n)){border-right:2px solid var(--text-primary)}.cell[data-astro-cid-jzabidmj]:nth-child(n+19):nth-child(-n+27),.cell[data-astro-cid-jzabidmj]:nth-child(n+46):nth-child(-n+54){border-bottom:2px solid var(--text-primary)}.pencil-marks[data-astro-cid-jzabidmj]{position:absolute;inset:2px;display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);pointer-events:none}.pencil-mark[data-astro-cid-jzabidmj]{font-size:.6rem;display:flex;align-items:center;justify-content:center;color:var(--text-secondary);opacity:.7}@keyframes hintFlash{0%{background:#22c55e99}to{background:#22c55e1a}}.numpad[data-astro-cid-jzabidmj]{display:flex;justify-content:center;gap:.5rem;margin-bottom:1.5rem;flex-wrap:wrap}.num-btn[data-astro-cid-jzabidmj]{width:48px;height:48px;border-radius:10px;border:1px solid var(--border-color);background:var(--card-bg);color:var(--text-primary);font-size:1.25rem;font-weight:600;cursor:pointer;transition:all .2s}.num-btn[data-astro-cid-jzabidmj]:hover{background:var(--bg-hover);transform:translateY(-2px)}.num-btn[data-astro-cid-jzabidmj]:active{transform:translateY(0)}.num-btn[data-astro-cid-jzabidmj].erase-btn{font-size:1rem;background:var(--bg-secondary)}@media(max-width:640px){.num-btn[data-astro-cid-jzabidmj]{width:40px;height:40px;font-size:1rem}}.rules-card[data-astro-cid-jzabidmj]{background:var(--card-bg);border-radius:16px;padding:1.5rem;margin-bottom:1.5rem;box-shadow:var(--shadow-sm)}.rules-card[data-astro-cid-jzabidmj] h3[data-astro-cid-jzabidmj]{font-size:1.25rem;margin-bottom:1rem;color:var(--text-primary)}.rules-card[data-astro-cid-jzabidmj] ol[data-astro-cid-jzabidmj]{padding-left:1.5rem;color:var(--text-secondary);line-height:1.8}.btn-primary[data-astro-cid-jzabidmj]{background:var(--accent-color);color:#fff;border:none;padding:.6rem 1.2rem;border-radius:10px;font-weight:600;cursor:pointer;transition:all .2s}.btn-primary[data-astro-cid-jzabidmj]:hover{filter:brightness(1.1);transform:translateY(-1px)}.btn-secondary[data-astro-cid-jzabidmj]{background:var(--bg-secondary);color:var(--text-primary);border:1px solid var(--border-color);padding:.6rem 1.2rem;border-radius:10px;font-weight:600;cursor:pointer;transition:all .2s}.btn-secondary[data-astro-cid-jzabidmj]:hover{background:var(--bg-hover)}.modal-overlay[data-astro-cid-jzabidmj]{position:fixed;inset:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:100}.modal-content[data-astro-cid-jzabidmj]{background:var(--card-bg);border-radius:20px;padding:2rem;text-align:center;max-width:400px;width:90%;box-shadow:var(--shadow-lg)}.win-icon[data-astro-cid-jzabidmj]{font-size:4rem;margin-bottom:1rem}.modal-content[data-astro-cid-jzabidmj] h2[data-astro-cid-jzabidmj]{font-size:1.75rem;margin-bottom:.5rem;color:var(--text-primary)}.modal-content[data-astro-cid-jzabidmj]>p[data-astro-cid-jzabidmj]{color:var(--text-secondary);margin-bottom:1.5rem}.win-stats[data-astro-cid-jzabidmj]{display:flex;justify-content:center;gap:2rem;margin-bottom:1.5rem}.win-stat[data-astro-cid-jzabidmj]{text-align:center}.win-stat-label[data-astro-cid-jzabidmj]{display:block;font-size:.75rem;color:var(--text-secondary);text-transform:uppercase}.win-stat-value[data-astro-cid-jzabidmj]{display:block;font-size:1.5rem;font-weight:700;color:var(--accent-color)}.win-badge[data-astro-cid-jzabidmj]{background:linear-gradient(135deg,gold,#fa0);color:#333;padding:.5rem 1rem;border-radius:20px;font-weight:700;margin-bottom:1.5rem;display:inline-block}.modal-actions[data-astro-cid-jzabidmj]{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap}.toast[data-astro-cid-jzabidmj]{position:fixed;bottom:2rem;left:50%;transform:translate(-50%) translateY(100px);background:var(--text-primary);color:#fff;padding:.75rem 1.5rem;border-radius:10px;font-weight:500;opacity:0;transition:all .3s;z-index:200;pointer-events:none;white-space:nowrap}.toast[data-astro-cid-jzabidmj].show{transform:translate(-50%) translateY(0);opacity:1}