:root{color-scheme:light;--bg: #f3f6fb;--card: #ffffff;--text: #1f2937;--muted: #6b7280;--primary: #2563eb;--primary-hover: #1d4ed8;--border: #dbe3f0;--shadow: 0 12px 30px rgba(37, 99, 235, .12);--focus-ring: #0f766e;--error: #dc2626;--success: #059669}html[data-appearance=forest]{--primary: #12805c;--primary-hover: #0f6b4d}html[data-appearance=space]{--primary: #0ea5e9}html[data-appearance=paper]{--primary: #b9482b}html[data-theme=dark]{color-scheme:dark;--bg: #0f172a;--card: #172033;--text: #e5edf8;--muted: #a9b8cc;--border: #334155;--shadow: 0 12px 30px rgba(0, 0, 0, .28)}*{box-sizing:border-box}html,body{margin:0;min-height:100%}body{color:var(--text);background:var(--bg);font-family:Inter,PingFang SC,Microsoft YaHei,sans-serif}:focus-visible{outline:3px solid var(--focus-ring);outline-offset:2px}.skip-link{position:fixed;top:8px;left:8px;z-index:200;padding:10px 14px;border-radius:8px;color:#fff;background:#111827}.skip-link:not(:focus){width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}.topbar{min-height:70px;display:flex;align-items:center;gap:24px;padding:0 max(22px,calc((100% - 880px)/2));background:var(--card);border-bottom:1px solid var(--border)}.topbar div{display:flex;flex:1;flex-direction:column;min-width:0}.topbar a{color:var(--muted);text-decoration:none;font-weight:700}.topbar small{color:var(--muted)}.shushi-main{display:grid;gap:18px;padding:20px max(16px,calc((100% - 880px)/2)) 72px}.shushi-main:focus{outline:none}.shushi-main.shushi-working{gap:0}.shushi-panel{padding:20px;background:var(--card);border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow)}.shushi-working .shushi-workspace{padding:22px 22px 20px}.shushi-workspace[hidden]{display:none}.shushi-panel h1,.shushi-panel h2{margin:0 0 14px;font-size:1.1rem}.shushi-hub{display:grid;gap:14px;padding:18px}.shushi-hub[hidden]{display:none}.shushi-hub-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.shushi-hub-head h1{margin:3px 0 4px;font-size:clamp(1.15rem,2.8vw,1.45rem)}.shushi-hub-head p{margin:0;color:var(--muted);line-height:1.5}.shushi-hub-kicker,.shushi-method-category{color:var(--primary);font-size:.78rem;font-weight:800;letter-spacing:.06em}.shushi-hub-count{flex:0 0 auto;padding:6px 10px;color:var(--text);background:color-mix(in srgb,var(--primary) 14%,var(--card));border-radius:999px;font-size:.78rem;font-weight:800;white-space:nowrap}.shushi-method-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:8px}.shushi-method-grid>[role=listitem]{display:flex;min-width:0}.shushi-method-card{display:flex;align-items:center;gap:8px;width:100%;min-width:0;min-height:48px;padding:8px 10px;color:var(--text);text-align:left;background:var(--card);border:2px solid var(--border);border-radius:12px;cursor:pointer;transition:border-color .18s ease,background-color .18s ease}.shushi-method-card:hover{border-color:var(--primary)}.shushi-method-card.is-selected{background:color-mix(in srgb,var(--primary) 7%,var(--card));border-color:var(--primary)}.shushi-method-card.is-selected .shushi-method-card-title{color:var(--primary)}.shushi-method-mark{display:grid;flex:0 0 30px;place-items:center;width:30px;height:30px;color:#fff;background:var(--primary);border-radius:9px;font-weight:900}.shushi-method-card-content{display:grid;gap:1px;min-width:0}.shushi-method-card-title{overflow:hidden;font-size:.9rem;line-height:1.2;text-overflow:ellipsis;white-space:nowrap}.shushi-method-card-category{overflow:hidden;color:color-mix(in srgb,var(--text) 78%,var(--muted));font-size:.72rem;text-overflow:ellipsis;white-space:nowrap}.shushi-method-stage{display:grid;gap:14px;padding-top:14px;border-top:1px solid var(--border)}.shushi-method-stage[hidden]{display:none}.shushi-hub .shushi-composer h2{margin:0}.shushi-method-preview{display:grid;gap:14px;padding:14px;background:color-mix(in srgb,var(--primary) 5%,var(--card));border:1px solid color-mix(in srgb,var(--primary) 22%,var(--border));border-radius:12px}.shushi-method-preview[hidden],#columnarWorkspace[hidden]{display:none}.shushi-method-preview-head{display:grid;gap:4px}.shushi-method-preview-head h2,#methodPreviewTitle{margin:4px 0 6px;font-size:1.15rem;font-weight:800}.shushi-method-preview-head p{max-width:660px;margin:0;color:var(--muted);line-height:1.5}.shushi-method-visual{display:flex;align-items:center;width:100%;min-width:0;min-height:132px;padding:14px;background:var(--card);border:1px solid var(--border);border-radius:10px;overflow-x:auto;overflow-y:hidden;touch-action:pan-y}.shushi-ten-demo{display:grid;gap:14px;width:100%;justify-items:center}.shushi-ten-talk{margin:0;width:100%;max-width:100%;padding:8px 14px;color:var(--primary);background:color-mix(in srgb,var(--primary) 8%,var(--card));border-radius:10px;font-size:1.05rem;font-weight:800;font-variant-numeric:tabular-nums;text-align:center;overflow-wrap:break-word;animation:shushi-talk-in .28s ease}.shushi-ten-board{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:14px 18px;width:100%}.shushi-ten-side{display:grid;gap:8px;justify-items:center}.shushi-ten-caption{color:var(--muted);font-size:.82rem;font-weight:800}.shushi-ten-frame{display:grid;grid-template-columns:repeat(5,28px);grid-template-rows:repeat(2,28px);gap:6px;padding:10px;border:2px solid var(--primary);border-radius:12px;background:color-mix(in srgb,var(--primary) 6%,var(--card))}.shushi-ten-cell{width:28px;height:28px;border:2px dashed color-mix(in srgb,var(--primary) 35%,var(--border));border-radius:50%;background:var(--card)}.shushi-ten-cell.is-needed{border-style:dashed;border-color:var(--primary);background:color-mix(in srgb,var(--primary) 12%,var(--card));animation:shushi-need-pulse 1.4s ease-in-out infinite}.shushi-ten-cell.is-filled{border-style:solid;border-color:var(--primary);background:var(--primary)}.shushi-ten-cell.is-added{border-color:var(--success);background:var(--success)}.shushi-ten-cell.is-added:not(.is-awaiting):not(.is-landed){animation:shushi-fill-in .42s ease-out both}.shushi-ten-cell.is-added.is-awaiting{animation:none;opacity:1;transform:none;border-style:dashed;background:color-mix(in srgb,var(--success) 12%,var(--card))}.shushi-ten-cell.is-added.is-landed{animation:none;border-style:solid;background:var(--success)}.shushi-ten-plus{color:var(--muted);font-size:1.6rem;font-weight:900}.shushi-ten-dots{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;max-width:168px}.shushi-ten-dot{width:18px;height:18px;border-radius:50%;background:var(--primary)}.shushi-ten-dot.is-take{background:var(--success);animation:shushi-pop .32s ease-out}.shushi-ten-dot.is-rest{background:color-mix(in 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ease-out}.shushi-part-demo{display:grid;gap:14px;width:100%;justify-items:center}.shushi-part-board{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:12px 16px;width:100%;min-height:148px}.shushi-part-split,.shushi-part-op-row,.shushi-part-aside-row{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:8px 10px}.shushi-part-split,.shushi-part-op-row{flex:1 1 220px}.shushi-part-split{padding:8px 12px;background:color-mix(in srgb,var(--primary) 4%,var(--card));border-radius:12px}.shushi-part-source{flex:0 0 auto;min-width:1.6em;color:var(--text);font-size:1.45rem;font-weight:900;font-variant-numeric:tabular-nums;text-align:right}.shushi-part-sign,.shushi-part-join{flex:0 0 auto;color:var(--muted);font-weight:900}.shushi-part-sign{font-size:1.2rem}.shushi-part-join{display:grid;place-items:center;min-width:36px;min-height:36px;color:#fff;background:var(--primary);border-radius:50%;font-size:1.25rem}.shushi-part-kicker{flex:1 0 100%;color:var(--primary);font-size:.82rem;font-weight:800;letter-spacing:.04em;text-align:center}.shushi-part-piece{display:grid;gap:4px;justify-items:center;min-width:64px;padding:8px 10px;background:color-mix(in srgb,var(--primary) 7%,var(--card));border:2px solid transparent;border-radius:10px}.shushi-part-piece.is-current{border-color:var(--primary);background:color-mix(in srgb,var(--primary) 14%,var(--card));animation:shushi-land-in .32s ease-out}.is-flipping{animation:none!important}.shushi-part-ones{background:color-mix(in srgb,var(--success) 8%,var(--card))}.shushi-part-ones.is-current{border-color:var(--success);background:color-mix(in srgb,var(--success) 14%,var(--card))}.shushi-part-mixed{background:color-mix(in srgb,var(--success) 6%,color-mix(in srgb,var(--primary) 6%,var(--card)))}.shushi-part-tokens{display:flex;align-items:center;justify-content:center;gap:6px;min-height:26px}.shushi-part-rods,.shushi-part-dots{display:flex;flex-wrap:nowrap;align-items:center;justify-content:center;gap:4px}.shushi-part-rod{width:9px;height:26px;border-radius:3px;background:var(--primary)}.shushi-part-dot{width:11px;height:11px;border-radius:50%;background:var(--success)}.shushi-part-value{color:var(--primary);font-size:1.05rem;font-weight:900;font-variant-numeric:tabular-nums}.shushi-part-ones .shushi-part-value{color:var(--success)}.shushi-part-mixed .shushi-part-value{color:var(--text)}.shushi-part-caption{color:color-mix(in srgb,var(--text) 86%,var(--muted));font-size:.72rem;font-weight:800}.shushi-part-aside{display:grid;gap:6px;justify-items:center;width:100%;padding:8px 10px;background:color-mix(in srgb,var(--border) 35%,var(--card));border-radius:10px}.shushi-part-aside-label{color:color-mix(in srgb,var(--text) 86%,var(--muted));font-size:.78rem;font-weight:800}.shushi-part-aside .shushi-part-piece{min-width:52px;padding:6px 8px}.shushi-part-total{color:var(--success);font-size:2.1rem;font-weight:900;font-variant-numeric:tabular-nums;animation:shushi-land-in .36s ease-out}.shushi-part-so{flex:1 0 100%;margin:0;color:var(--success);font-size:1.05rem;font-weight:800;font-variant-numeric:tabular-nums;text-align:center}.shushi-method-step.is-current{padding:6px 8px 6px 0;background:color-mix(in srgb,var(--primary) 8%,transparent);border-radius:10px}.shushi-method-step.is-current .shushi-method-step-text{color:var(--text)}.shushi-method-step.is-done:before{background:var(--success)}.shushi-method-step.is-upcoming:before{color:var(--muted);background:transparent;border:2px solid var(--border)}.shushi-method-step.is-upcoming 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1fr;gap:8px;align-items:start;counter-increment:method-step}.shushi-method-step:before{content:counter(method-step);display:grid;place-items:center;width:26px;height:26px;color:#fff;background:var(--primary);border-radius:50%;font-size:.78rem;font-weight:900}.shushi-method-step-title,.shushi-method-step-text{grid-column:2}.shushi-method-step-title{display:block;margin-bottom:2px}.shushi-method-step-text{color:var(--muted);font-size:.9rem;line-height:1.45}.shushi-method-steps:has(.is-current) .shushi-method-step{cursor:pointer}.shushi-workspace>.shushi-method-steps{margin:12px 0 0;padding-top:12px;border-top:1px solid color-mix(in srgb,var(--primary) 18%,var(--border))}.shushi-method-steps[hidden]{display:none}@media(min-width:900px){.shushi-workspace>.shushi-method-steps{grid-template-columns:repeat(4,minmax(0,1fr));gap:8px 10px}}.shushi-line-demo,.shushi-dist-demo{display:grid;gap:14px;width:100%;justify-items:center}.shushi-line-board,.shushi-dist-board{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:12px 16px;width:100%;min-height:148px}.shushi-line-minus{flex:0 0 auto;color:var(--muted);font-size:1.05rem;font-weight:800}.shushi-line-path{position:relative;display:flex;align-items:stretch;justify-content:center;width:100%;min-width:0;max-width:100%}.shushi-line-path:before{content:"";position:absolute;left:18px;right:18px;top:43.5px;height:3px;background:color-mix(in srgb,var(--primary) 38%,var(--border));pointer-events:none}.shushi-line-stop,.shushi-line-jump{display:grid;grid-template-rows:24px 42px auto;align-items:center;justify-items:center;z-index:1}.shushi-line-stop .shushi-number-line-point{grid-row:2}.shushi-line-stop-label{grid-row:3}.shushi-line-jump-op{grid-row:1}.shushi-line-jump-arc{grid-row:2}.shushi-line-board>.shushi-line-stop{grid-template-rows:42px auto}.shushi-line-board>.shushi-line-stop .shushi-number-line-point{grid-row:1}.shushi-line-board>.shushi-line-stop .shushi-line-stop-label{grid-row:2}.shushi-line-jump{flex:1 1 88px;min-width:72px;color:var(--primary)}.shushi-line-jump.is-ones{color:var(--success)}.shushi-line-jump:not(.is-current):not(.is-done){color:var(--muted)}.shushi-line-jump-op{padding:0 8px;color:inherit;background:color-mix(in srgb,currentColor 12%,var(--card));border-radius:999px;font-size:.82rem;font-weight:800;font-variant-numeric:tabular-nums;line-height:1.4}.shushi-line-jump-arc{align-self:end;width:100%;height:26px;border:3px solid currentColor;border-bottom:0;border-radius:50% 50% 0 0}.shushi-line-jump.is-current .shushi-line-jump-arc{border-width:4px;animation:shushi-arc-in .45s ease-out}.shushi-number-line-point.is-current,.shushi-number-line-point.is-end{animation:shushi-land-in .32s 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10px;color:#fff;background:var(--primary);border-radius:12px;font-weight:900}.shushi-dist-times-mark{font-size:1.05rem;line-height:1}.shushi-dist-times-n{font-size:1.45rem;line-height:1;font-variant-numeric:tabular-nums}.shushi-dist-times-caption{font-size:.72rem;font-weight:800}.shushi-dist-array{display:flex;flex-wrap:wrap;align-items:stretch;justify-content:center;gap:10px;width:100%}.shushi-dist-col{display:grid;gap:6px;justify-items:center;min-width:92px;padding:8px 10px;background:color-mix(in srgb,var(--primary) 7%,var(--card));border:2px solid transparent;border-radius:12px}.shushi-dist-ones{background:color-mix(in srgb,var(--success) 8%,var(--card))}.shushi-dist-col.is-current{border-color:var(--primary);background:color-mix(in srgb,var(--primary) 14%,var(--card));animation:shushi-land-in .32s ease-out}.shushi-dist-ones.is-current{border-color:var(--success);background:color-mix(in srgb,var(--success) 14%,var(--card))}.shushi-dist-col.is-dim{opacity:.42}.shushi-dist-head{color:var(--primary);font-size:.95rem;font-weight:900;font-variant-numeric:tabular-nums}.shushi-dist-ones .shushi-dist-head,.shushi-dist-ones .shushi-dist-foot{color:color-mix(in srgb,var(--success) 58%,var(--text))}.shushi-dist-cell{display:flex;align-items:center;justify-content:center;min-height:26px;padding:4px 6px;background:color-mix(in srgb,var(--card) 78%,transparent);border-radius:8px}.shushi-dist-cell.is-enter{animation:shushi-land-in .32s ease-out both}.shushi-dist-foot{max-width:7.5rem;color:var(--primary);font-size:.82rem;font-weight:800;font-variant-numeric:tabular-nums;text-align:center;line-height:1.35}.shushi-workspace>.shushi-method-grid{margin:0 0 18px;padding-bottom:14px;border-bottom:1px solid var(--border)}.shushi-result-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin-bottom:16px}.shushi-result-head h2{display:grid;gap:4px;margin:0;min-width:0;font-size:inherit}.shushi-result-kicker{font-size:.78rem;font-weight:800;letter-spacing:.06em;color:var(--muted)}.shushi-problem{font-size:1.35rem;font-weight:800;font-variant-numeric:tabular-nums;color:var(--text)}#btnNew{flex:0 0 auto;min-height:42px;padding:8px 16px}.shushi-workspace:focus{outline:none}.shushi-form{display:block}.shushi-builder{display:grid;gap:10px;max-width:320px}.shushi-field{display:grid;gap:6px;min-width:0}.shushi-field span{color:var(--muted);font-size:.84rem}.shushi-field input{min-height:52px;padding:10px 14px;font:inherit;font-size:1.45rem;font-weight:700;font-variant-numeric:tabular-nums;text-align:right;color:var(--text);background:var(--bg);border:2px solid var(--border);border-radius:10px}.shushi-field input:focus{border-color:var(--primary);background:var(--card)}.shushi-ops{display:flex;gap:8px}.shushi-op{flex:1;min-height:46px;padding:8px 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