:root{--text:#6b6375;--text-h:#08060d;--bg:#fff;--border:#e5e4e7;--code-bg:#f4f3ec;--accent:#aa3bff;--accent-bg:#aa3bff1a;--accent-border:#aa3bff80;--social-bg:#f4f3ec80;--shadow:#0000001a 0 10px 15px -3px, #0000000d 0 4px 6px -2px;--sans:system-ui, "Segoe UI", Roboto, sans-serif;--heading:system-ui, "Segoe UI", Roboto, sans-serif;--mono:ui-monospace, Consolas, monospace;font:18px/145% var(--sans);letter-spacing:.18px;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;color:var(--text);background:var(--bg);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial}}@media (width<=1024px){:root{font-size:16px}}@media (prefers-color-scheme:dark){:root{--text:#9ca3af;--text-h:#f3f4f6;--bg:#16171d;--border:#2e303a;--code-bg:#1f2028;--accent:#c084fc;--accent-bg:#c084fc26;--accent-border:#c084fc80;--social-bg:#2f303a80;--shadow:#0006 0 10px 15px -3px, #00000040 0 4px 6px -2px}#social .button-icon{filter:invert()brightness(2)}}body{margin:0}#root{text-align:center;border-inline:1px solid var(--border);box-sizing:border-box;flex-direction:column;width:1126px;max-width:100%;min-height:100svh;margin:0 auto;display:flex}h1,h2{font-family:var(--heading);color:var(--text-h);font-weight:500}h1{letter-spacing:-1.68px;margin:32px 0;font-size:56px}@media (width<=1024px){h1{margin:20px 0;font-size:36px}}h2{letter-spacing:-.24px;margin:0 0 8px;font-size:24px;line-height:118%}@media (width<=1024px){h2{font-size:20px}}p{margin:0}code,.counter{font-family:var(--mono);color:var(--text-h);border-radius:4px;display:inline-flex}code{background:var(--code-bg);padding:4px 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#0003}.level-btn.lv1{background:linear-gradient(135deg,#74b9ff,#0984e3)}.level-btn.lv2{background:linear-gradient(135deg,#55efc4,#00b894)}.level-btn.lv3{background:linear-gradient(135deg,#fd79a8,#d63031)}.level-btn.lv4{background:linear-gradient(135deg,#a29bfe,#6c5ce7)}.level-btn.lv-sub{background:linear-gradient(135deg,#fd79a8,#e17055)}.level-btn.lv-seq{background:linear-gradient(135deg,#55efc4,#0984e3)}.level-btn .lv-icon{text-align:center;white-space:nowrap;flex-shrink:0;min-width:80px;font-size:1.6rem}.level-btn .lv-desc{opacity:.9;margin-top:2px;font-size:.85rem;font-weight:400}.game-screen{background:#fff;border-radius:24px;width:100%;max-width:680px;padding:36px 48px;box-shadow:0 20px 60px #00000026}.game-header{justify-content:space-between;align-items:center;margin-bottom:28px;display:flex}.back-btn{cursor:pointer;color:#636e72;background:#f0f0f0;border:none;border-radius:10px;padding:8px 16px;font-size:.95rem;transition:background 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32px;display:inline-block}.column-row{color:#2d3436;align-items:center;height:72px;font-family:Courier New,monospace;font-size:2.8rem;font-weight:700;line-height:1;display:flex}.col-digit{flex-shrink:0;justify-content:center;align-items:center;width:64px;height:72px;display:flex}.col-sign{color:#636e72}.col-sign-placeholder{visibility:hidden}.column-line{border:none;border-top:3px solid #2d3436;margin:12px 0}.column-answer-row{align-items:center;display:flex}.col-input{text-align:center;color:#2d3436;background:#fff;border:3px solid #dfe6e9;border-radius:8px;outline:none;width:64px;height:64px;font-family:Courier New,monospace;font-size:2.2rem;font-weight:700;transition:border-color 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#0984e3;border-radius:12px;outline:none;width:56px;height:56px;font-size:1.6rem;font-weight:700}.borrow-hint-tip{text-align:center;color:#b2bec3;margin-top:10px;font-size:.82rem}.col-label-row{height:28px!important}.col-label{color:#b2bec3;text-transform:uppercase;letter-spacing:.5px;font-weight:600;height:28px!important;font-family:Segoe UI,sans-serif!important;font-size:.7rem!important}.answer-area{flex-direction:column;align-items:center;gap:24px;margin-bottom:24px;display:flex}.question-inline{align-items:center;gap:16px;display:flex}.question-part{color:#2d3436;white-space:nowrap;font-size:3rem;font-weight:700}.answer-input-inline{text-align:center;color:#2d3436;border:3px solid #dfe6e9;border-radius:16px;outline:none;width:100px;height:80px;font-size:2.8rem;font-weight:700;transition:border-color 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#0984e366}.check-btn:disabled{opacity:.5;cursor:default;box-shadow:none;transform:none}.feedback{text-align:center;border-radius:12px;margin-bottom:20px;padding:16px;font-size:1.3rem;font-weight:600}.feedback.correct{color:#00b894;background:#d4f7ee}.feedback.wrong{color:#d63031;background:#ffe4e4}.next-btn{color:#fff;cursor:pointer;background:linear-gradient(135deg,#55efc4,#00b894);border:none;border-radius:14px;margin:0 auto;padding:12px 36px;font-size:1.1rem;font-weight:700;transition:transform .15s;display:block}.next-btn:hover{transform:translateY(-2px)}.mode-toggle{justify-content:center;gap:10px;margin-bottom:28px;display:flex}.mode-btn{cursor:pointer;color:#636e72;background:#fff;border:2px solid #dfe6e9;border-radius:20px;padding:8px 20px;font-size:.9rem;transition:all .15s}.mode-btn.active{color:#0984e3;background:#e8f4fd;border-color:#0984e3;font-weight:600}.summary{text-align:center;background:#fff;border-radius:24px;width:100%;max-width:440px;position:relative;box-shadow:0 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#0003}.task-cat-label{text-transform:uppercase;letter-spacing:.06em;opacity:.8;font-size:.7rem;font-weight:700}.task-title{margin-top:.3rem;font-size:.95rem;font-weight:700;line-height:1.3}.task-desc{opacity:.85;font-size:.8rem}.task-stars{margin-top:auto;padding-top:.5rem;font-size:.82rem}.cat-add{background:linear-gradient(135deg,#55efc4,#00b894)}.cat-sub{background:linear-gradient(135deg,#fd79a8,#d63031)}.cat-seq{background:linear-gradient(135deg,#74b9ff,#0984e3)}.cat-mul{background:linear-gradient(135deg,#fdcb6e,#e17055)}.cat-units{background:linear-gradient(135deg,#a29bfe,#6c5ce7)}.mul-question{flex-direction:column;align-items:center;gap:24px;display:flex}.mul-equation{align-items:center;gap:16px;display:flex}.mul-num{color:#2d3436;font-size:3rem;font-weight:700}.mul-op{color:#636e72;font-size:2.2rem;font-weight:400}.mul-input{text-align:center;color:#2d3436;border:3px solid 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#0000002e}.dialog-title{color:#2d3436;text-align:center;margin:0;font-size:1.4rem;font-weight:700}.dialog-field{flex-direction:column;gap:8px;display:flex}.dialog-label{color:#636e72;text-transform:uppercase;letter-spacing:.04em;font-size:.9rem;font-weight:600}.dialog-options{flex-wrap:wrap;gap:8px;display:flex}.dialog-opt-btn{color:#2d3436;cursor:pointer;background:#f8f9fa;border:2px solid #dfe6e9;border-radius:10px;padding:8px 16px;font-size:1rem;font-weight:600;transition:all .15s}.dialog-opt-btn:hover{background:#ebf5ff;border-color:#74b9ff}.dialog-opt-btn.selected{color:#fff;background:#0984e3;border-color:#0984e3}.dialog-actions{justify-content:flex-end;gap:12px;margin-top:4px;display:flex}.dialog-cancel-btn{color:#636e72;cursor:pointer;background:#f8f9fa;border:2px solid #dfe6e9;border-radius:10px;padding:10px 22px;font-size:1rem;font-weight:600}.dialog-start-btn{color:#fff;cursor:pointer;background:#0984e3;border:none;border-radius:10px;padding:10px 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0;display:flex}.measure-given{align-items:baseline;gap:6px;display:flex}.measure-number{color:#2d3436;font-size:3rem;font-weight:700}.measure-unit{color:#636e72;font-size:1.4rem;font-weight:600}.measure-equals{color:#636e72;font-size:2.5rem;font-weight:300}.measure-answer-group{flex-wrap:wrap;justify-content:center;align-items:center;gap:8px;display:flex}.measure-input{text-align:center;color:#2d3436;border:3px solid #dfe6e9;border-radius:16px;outline:none;width:130px;height:90px;font-size:2.6rem;font-weight:700;transition:border-color .2s}.measure-input:focus{border-color:#74b9ff}.measure-input.correct{background:#d4f7ee;border-color:#00b894}.measure-input.wrong{background:#ffe4e4;border-color:#d63031}.measure-input:disabled{opacity:.7}.measure-input.wide{width:160px}.measure-correct-answer{color:#00b894;background:#d4f7ee;border-radius:10px;padding:6px 16px;font-size:1.1rem;font-weight:600}.cat-measure{background:linear-gradient(135deg,#a29bfe,#6c5ce7)}