:root{--bg:#f4f5f7;--panel-bg:#fff;--btn-bg:#fff;--cell-bg:#fff;--line:#c3c9d4;--line-thick:#33404f;--text:#1e2733;--text-dim:#66707d;--given:#101820;--entry:#2563eb;--mark:#4b6584;--accent:#2563eb;--accent-soft:#2563eb2e;--conflict:#dc2626;--conflict-bg:#dc26261f;--peer-bg:#64748b1a;--cell:clamp(34px, 6.2vmin, 58px)}[data-theme=dark]{--bg:#0f141b;--panel-bg:#1a212c;--btn-bg:#232c39;--cell-bg:#151c26;--line:#3b4757;--line-thick:#91a3ba;--text:#e2e8f0;--text-dim:#93a0b0;--given:#f4f7fb;--entry:#7fb3ff;--mark:#9fb4cd;--accent:#60a5fa;--accent-soft:#60a5fa40;--conflict:#f87171;--conflict-bg:#f8717129;--peer-bg:#94a3b81f}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;transition:background .2s}.app{max-width:1100px;margin:0 auto;padding:20px 24px 48px}.header{align-items:baseline;gap:16px;margin-bottom:20px;display:flex}.header h1{letter-spacing:-.01em;margin:0;font-size:22px;font-weight:700}.solved-badge{color:#fff;background:#16a34a;border-radius:999px;padding:4px 12px;font-size:13px;font-weight:600}.status{color:var(--text-dim);font-size:13px}.theme-toggle{cursor:pointer;background:0 0;border:none;border-radius:8px;margin-left:auto;padding:4px;font-size:18px}.theme-toggle:hover{background:var(--accent-soft)}.setting{color:var(--text-dim);cursor:pointer;-webkit-user-select:none;user-select:none;align-items:center;gap:7px;margin-top:10px;font-size:12px;display:flex}.setting input{accent-color:var(--accent)}.layout{flex-wrap:wrap;align-items:flex-start;gap:32px;display:flex}.board-wrap{-webkit-user-select:none;user-select:none}.board-row{display:flex}.col-handles{grid-template-columns:22px repeat(9, var(--cell));margin-bottom:2px;display:grid}.row-handles{grid-template-rows:repeat(9, var(--cell));border-top:2px solid #0000;width:22px;margin-right:2px;display:grid}.handle{color:var(--text-dim);cursor:pointer;background:0 0;border:none;border-radius:4px;padding:0;font-size:11px;font-weight:600}.handle:hover{background:var(--accent-soft);color:var(--accent)}.board{grid-template-columns:repeat(9, var(--cell));grid-template-rows:repeat(9, var(--cell));border:2px solid var(--line-thick);background:var(--cell-bg);touch-action:none;border-radius:2px;display:grid;box-shadow:0 4px 16px #141e2d1a}.cell{border-right:1px solid var(--line);border-bottom:1px solid var(--line);cursor:pointer;background:var(--cell-bg);justify-content:center;align-items:center;display:flex;position:relative}.cell:nth-child(9n){border-right:none}.cell:nth-child(n+73){border-bottom:none}.cell.thick-r{border-right:2px solid var(--line-thick)}.cell.thick-b{border-bottom:2px solid var(--line-thick)}.cell.peer:before{content:"";background:var(--peer-bg);pointer-events:none;position:absolute;inset:0}.cell.same-digit:before{content:"";pointer-events:none;background:#2563eb14;position:absolute;inset:0}.cell.selected:after{content:"";background:var(--accent-soft);box-shadow:inset 0 0 0 2.5px var(--accent);pointer-events:none;position:absolute;inset:0}.digit{font-size:calc(var(--cell) * .58);color:var(--entry);font-weight:500;line-height:1}.cell.given .digit{color:var(--given);font-weight:700}.cell.conflict .digit{color:var(--conflict)}.cell.conflict{background-image:linear-gradient(var(--conflict-bg), var(--conflict-bg))}.corner-mark{font-size:calc(var(--cell) * .22);color:var(--mark);font-weight:600;line-height:1;position:absolute}.pos-tl{top:8%;left:10%}.pos-tr{top:8%;right:10%}.pos-bl{bottom:8%;left:10%}.pos-br{bottom:8%;right:10%}.pos-tc{top:8%;left:50%;transform:translate(-50%)}.pos-bc{bottom:8%;left:50%;transform:translate(-50%)}.pos-lc{top:50%;left:10%;transform:translateY(-50%)}.pos-rc{top:50%;right:10%;transform:translateY(-50%)}.center-marks{font-size:calc(var(--cell) * .26);color:var(--mark);letter-spacing:.02em;font-weight:600}.center-marks.tight{font-size:calc(var(--cell) * .19)}.panel{background:var(--panel-bg);border-radius:12px;flex-direction:column;flex:1;gap:18px;min-width:280px;max-width:380px;padding:18px 20px;display:flex;box-shadow:0 2px 12px #141e2d14}.panel section h2{text-transform:uppercase;letter-spacing:.08em;color:var(--text-dim);margin:0 0 8px;font-size:11px;font-weight:700}.mode-buttons{grid-template-columns:repeat(5,1fr);gap:6px;display:grid}.mode-btn{border:1.5px solid var(--line);background:var(--btn-bg);cursor:pointer;color:var(--text);border-radius:8px;flex-direction:column;align-items:center;gap:3px;padding:8px 2px;font-size:12px;display:flex}.mode-btn:hover{border-color:var(--accent)}.mode-btn.active{border-color:var(--accent);background:var(--accent-soft);font-weight:600}.mode-btn kbd{color:var(--text-dim);background:var(--bg);border-radius:3px;padding:1px 4px;font-size:9px}.digit-pad{grid-template-columns:repeat(5,1fr);gap:6px;display:grid}.digit-btn{border:1.5px solid var(--line);background:var(--btn-bg);height:44px;color:var(--text);cursor:pointer;border-radius:8px;font-size:18px;font-weight:600;position:relative}.digit-btn:hover{border-color:var(--accent)}.digit-btn.done{opacity:.4}.digit-btn .count{color:var(--text-dim);font-size:9px;font-weight:500;position:absolute;bottom:2px;right:5px}.digit-btn.delete{color:var(--conflict);font-size:16px}.palette{flex-wrap:wrap;gap:6px;margin-bottom:8px;display:flex}.swatch{cursor:pointer;border:1.5px solid #00000026;border-radius:6px;width:28px;height:28px}.swatch:hover{transform:scale(1.12)}.swatch.clear{background:var(--btn-bg);color:var(--text-dim);font-size:12px}.text-btn{color:var(--text-dim);cursor:pointer;background:0 0;border:none;padding:0;font-size:12px;text-decoration:underline}.text-btn:hover{color:var(--text)}.action-grid{grid-template-columns:1fr 1fr;gap:6px;display:grid}.action-grid button{border:1.5px solid var(--line);background:var(--btn-bg);color:var(--text);cursor:pointer;border-radius:8px;padding:8px 10px;font-size:13px}.action-grid button:hover{border-color:var(--accent)}.action-grid button.danger{color:var(--conflict)}.action-grid button.danger:hover{border-color:var(--conflict)}.help ul{color:var(--text-dim);margin:0;padding-left:16px;font-size:12px;line-height:1.9}.help kbd{background:var(--bg);border:1px solid var(--line);border-radius:4px;padding:0 4px;font-family:inherit;font-size:10px}@media (width<=820px){.layout{justify-content:center}.panel{max-width:none}}