*,*:before,*:after{box-sizing:border-box}:root{--ink: #2d2a26;--primary: #4c6ef5;--primary-dark: #3b5bdb;--accent: #ff9f43;--accent-dark: #f0790a;--success: #22c55e;--success-bg: #dcfce7;--danger: #f0554b;--danger-bg: #ffe1de;--amber: #b45309;--amber-bg: #fffbeb;--amber-border: #fde68a;--card-bg: #ffffff;--card-shadow: 0 10px 28px rgba(120, 90, 40, .12);--card-radius: 24px}body{margin:0;font-family:Fredoka,system-ui,-apple-system,sans-serif;background:linear-gradient(160deg,#fff7e9,#ffe9cc 55%,#ffe0d6);background-attachment:fixed;color:var(--ink)}.app-navbar{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:16px;max-width:1260px;margin:32px auto 0;padding:0 24px}.app-header{display:flex;align-items:center;gap:10px;margin-right:auto}.app-logo{width:48px;height:48px;border-radius:12px;object-fit:cover;box-shadow:0 1px 4px #00000026;animation:mascot-float 2.6s ease-in-out infinite}@keyframes mascot-float{0%,to{transform:translateY(0) rotate(0)}50%{transform:translateY(-4px) rotate(-3deg)}}.app-name{font-size:1.7rem;font-weight:700;color:var(--ink);letter-spacing:-.3px}.tabs{display:flex;flex-wrap:wrap;justify-content:center;gap:10px}.tab{padding:10px 20px;border:none;border-radius:999px;background:var(--card-bg);color:#7c6f5f;font-family:inherit;font-size:15px;font-weight:600;white-space:nowrap;cursor:pointer;box-shadow:0 4px 12px #785a281a;transition:transform .15s ease,box-shadow .15s ease,background .15s ease,color .15s ease}.tab:hover{color:var(--ink);transform:translateY(-2px);box-shadow:0 6px 16px #785a2829}.tab.active{background:var(--primary);color:#fff;box-shadow:0 6px 16px #4c6ef559}.tab.active:hover{transform:none}.layout{display:flex;gap:24px;align-items:flex-start;justify-content:center;max-width:1260px;margin:24px auto 60px;padding:0 24px}.visual-panel{flex:1 1 320px;max-width:360px;padding:20px;background:var(--card-bg);border-radius:var(--card-radius);box-shadow:var(--card-shadow);animation:pop-in .3s ease-out}.visual-panel h2{display:flex;align-items:center;justify-content:center;gap:8px;margin:0 0 12px;font-size:1.2rem;font-weight:600;color:var(--primary-dark);text-align:center}.mistake-mascot{width:32px;height:32px;border-radius:8px;object-fit:cover;box-shadow:0 1px 4px #00000026;animation:mascot-ponder 1.8s ease-in-out infinite}@keyframes mascot-ponder{0%,to{transform:rotate(0)}50%{transform:rotate(-7deg)}}.practice-panel{flex:1 1 480px;max-width:480px;padding:24px;background:var(--card-bg);border-radius:var(--card-radius);box-shadow:var(--card-shadow)}h1{margin-top:0;font-size:1.9rem;font-weight:600;color:var(--ink);text-align:center}.stats-line{text-align:center;font-size:14px;font-weight:600;color:var(--accent-dark);background:#fff3e0;display:table;padding:3px 14px;border-radius:999px;margin:0 auto 8px}.addition{display:flex;flex-direction:column;align-items:center;gap:4px;margin:32px 0}.addition-row{display:flex;gap:8px}.cell{width:56px;height:64px;display:flex;align-items:center;justify-content:center;font-size:2.5rem;font-weight:600;color:var(--ink)}.cell.sign{width:32px;font-size:2rem;color:var(--accent-dark);font-weight:600}.addition-divider{width:calc((var(--cols, 3) + 1) * 56px + 32px + var(--cols, 3) * 8px);border-top:4px solid var(--accent);border-radius:4px;margin:4px 0}.answer-input{border:3px dashed #d9c6a3;border-radius:16px;background:#fffaf0;text-align:center;padding:0;color:var(--primary-dark);font-family:inherit;transition:border-color .15s ease,background .15s ease,transform .1s ease}.answer-input::placeholder{color:#e3d2b4;font-weight:600}.answer-input:not(:placeholder-shown){border-style:solid;border-color:#e3d2b4}.answer-input:focus{outline:none;border-style:solid;border-color:var(--primary);background:#eef1ff;transform:scale(1.05)}.answer-input:disabled{border-color:#ecdfc8;background:#fdf8ef;color:#b6a98f}.answer-input--success:disabled,.answer-box-display.answer-input--success{border-style:solid;border-color:var(--success);background:var(--success-bg);color:#15803d}.cell.mistake{color:var(--danger);background:var(--danger-bg);border-radius:12px;animation:shake .4s ease-in-out}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-4px)}75%{transform:translate(4px)}}.cell.highlight,.equation-horizontal .num.highlight{background:#fef9c3;border-radius:12px;box-shadow:0 0 0 2px #facc15;animation:highlight-pulse 1.2s ease-in-out infinite}.equation-horizontal .num.highlight{padding:0 6px}@keyframes highlight-pulse{0%,to{box-shadow:0 0 0 2px #facc15}50%{box-shadow:0 0 0 4px #fde047}}.carry-cell{position:relative}.carry-mark{position:absolute;top:2px;right:4px;font-size:.85rem;font-weight:700;color:var(--danger);animation:pop-in .3s ease-out}.addition-wrapper{position:relative}.equation-horizontal{display:flex;align-items:center;justify-content:center;gap:12px;margin:40px 0 24px}.equation-horizontal .num{font-size:2.5rem;font-weight:600;color:var(--ink)}.equation-horizontal .op{font-size:2rem;color:var(--accent-dark)}.equation-horizontal .num.mistake{color:var(--danger);background:var(--danger-bg);border-radius:10px;padding:0 6px;animation:shake .4s ease-in-out}.answer-boxes{display:flex;gap:8px;position:relative;border-radius:8px;cursor:text}.answer-boxes:focus-within{box-shadow:0 0 0 3px var(--primary);border-radius:16px}.answer-hidden-input{position:absolute;width:1px;height:1px;opacity:0;overflow:hidden;border:none;padding:0}.answer-box-display{border:3px solid #e3d2b4;border-radius:16px;background:#fffaf0;color:var(--primary-dark)}.answer-box-display--empty{border-style:dashed;border-color:#d9c6a3;color:#e3d2b4;font-weight:600}.carry-hint-inline{text-align:center;font-size:13px;font-weight:600;color:var(--danger);margin-bottom:16px}.celebration{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;font-size:1.8rem;font-weight:700;color:var(--success);background:#fffaf0e6;border-radius:var(--card-radius);animation:pop-in .3s ease-out}.celebration-mascot{width:56px;height:56px;border-radius:14px;object-fit:cover;box-shadow:0 4px 10px #0003;animation:mascot-pop-in .45s cubic-bezier(.34,1.56,.64,1) both,mascot-wiggle .7s ease-in-out .45s infinite}@keyframes mascot-pop-in{0%{transform:scale(0) rotate(-15deg);opacity:0}60%{transform:scale(1.15) rotate(6deg);opacity:1}80%{transform:scale(.95) rotate(-3deg)}to{transform:scale(1) rotate(0)}}@keyframes mascot-wiggle{0%,to{transform:translateY(0) rotate(0)}50%{transform:translateY(-6px) rotate(-6deg)}}@keyframes pop-in{0%{transform:scale(.8);opacity:0}to{transform:scale(1);opacity:1}}.practice-panel button{display:block;margin:16px auto 0;padding:12px 26px;border:none;background:var(--accent);color:#fff;font-family:inherit;border-radius:999px;cursor:pointer;font-size:15px;font-weight:600;box-shadow:0 6px 16px #ff9f4366;transition:transform .15s ease,box-shadow .15s ease,background .15s ease}.practice-panel button:hover:not(:disabled){background:var(--accent-dark);transform:translateY(-2px);box-shadow:0 8px 20px #ff9f4373}.practice-panel button:active:not(:disabled){transform:translateY(0)}.practice-panel button:disabled{background:#f5d9b8;box-shadow:none;cursor:default}.chat-panel{flex:1 1 320px;max-width:340px;height:560px;display:flex;flex-direction:column;padding:16px;background:var(--card-bg);border-radius:var(--card-radius);box-shadow:var(--card-shadow)}.chat-header{display:flex;align-items:center;justify-content:center;gap:8px;margin-bottom:12px}.chat-header h2{margin:0;font-size:1.2rem;font-weight:600;color:var(--primary-dark)}.teacher-avatar{width:32px;height:32px;border-radius:8px;object-fit:cover;box-shadow:0 1px 4px #00000026;animation:mascot-float 2.6s ease-in-out infinite}.teacher-avatar--listening{animation:avatar-sing-bounce .5s ease-in-out infinite}@keyframes avatar-sing-bounce{0%,to{transform:translateY(0) rotate(-4deg)}50%{transform:translateY(-5px) rotate(4deg)}}.teacher-avatar--thinking{animation:mascot-ponder 1.2s ease-in-out infinite}.speak-toggle{display:flex;align-items:center;gap:4px;font-size:14px;cursor:pointer;opacity:.6}.speak-toggle:has(input:checked){opacity:1}.count-helper{background:#fffbeb;border:1px solid #fde68a;border-radius:10px;padding:14px 16px;margin-bottom:14px;animation:pop-in .3s ease-out}.count-helper-title{font-size:14px;font-weight:600;color:#92400e;margin-bottom:10px;text-align:center}.count-row{display:flex;flex-direction:column;align-items:center;gap:6px;line-height:1.4;margin-bottom:8px}.icon-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:6px;justify-content:center}.icon-cell{position:relative;font-size:1.8rem;text-align:center;line-height:1}.icon-count{position:absolute;bottom:-4px;right:-2px;min-width:14px;padding:0 2px;border-radius:999px;background:#92400e;color:#fff;font-size:.65rem;font-weight:700;line-height:14px;text-align:center}.icon-grid-empty{color:#b45309;font-style:italic;font-size:.95rem;padding:6px 0}.count-number{font-weight:700;font-size:1rem;color:#92400e;min-width:1.2em;text-align:center}.count-plus{text-align:center;font-weight:700;color:#92400e;font-size:1rem}.carry-note{display:flex;align-items:center;justify-content:center;gap:8px;margin-top:8px;padding-top:8px;border-top:1px dashed #fde68a}.carry-basket{font-size:1.2rem}.carry-note-label{font-size:12px;font-weight:600;color:#92400e}.carry-only-text{font-size:13px;color:#92400e;text-align:center;margin:0}.chat-messages{flex:1;min-height:0;overflow-y:auto;display:flex;flex-direction:column;gap:8px;padding:4px}.chat-message{max-width:85%;padding:9px 14px;border-radius:16px;font-size:14px;line-height:1.4;white-space:pre-wrap;animation:pop-in .2s ease-out}.chat-message.assistant{align-self:flex-start;background:#eef1ff;color:var(--ink);border-bottom-left-radius:4px}.chat-message.user{align-self:flex-end;background:var(--primary);color:#fff;border-bottom-right-radius:4px}.chat-message.loading{color:#9a8c72;font-style:italic}.chat-error{color:var(--danger);font-size:13px;margin:4px 0}.chat-input-row{display:flex;gap:8px;margin-top:8px}.chat-input-row input{flex:1;padding:8px 12px;border:2px solid #e3d2b4;border-radius:999px;font-family:inherit;font-size:16px;transition:border-color .15s ease}.chat-input-row input:focus{outline:none;border-color:var(--primary)}.chat-input-row button{padding:8px 16px;border:none;background:var(--primary);color:#fff;font-family:inherit;border-radius:999px;cursor:pointer;font-size:14px;font-weight:600;transition:background .15s ease,transform .15s ease}.chat-input-row button:hover:not(:disabled){background:var(--primary-dark);transform:translateY(-1px)}.chat-input-row button:disabled{background:#c3cdf7;cursor:default}.mic-button{min-width:44px;padding:8px 10px;display:flex;align-items:center;justify-content:center;background:var(--accent)}.mic-button:hover:not(:disabled){background:var(--accent-dark)!important}.mic-button.listening{background:var(--danger);animation:mic-pulse 1s ease-in-out infinite}.mic-button.listening:hover{background:#d63d33!important}@keyframes mic-pulse{0%,to{opacity:1}50%{opacity:.55}}@media (max-width: 820px){.layout{flex-direction:column;align-items:center}.chat-panel,.visual-panel{max-width:480px;width:100%}}@media (max-width: 480px){html,body{height:100%;overflow:hidden;overscroll-behavior:none}#root{position:fixed;top:var(--app-offset-top, 0px);left:0;right:0;display:flex;flex-direction:column;height:100vh;height:100dvh;height:var(--app-height, 100dvh);overflow-y:auto}.app-navbar{flex:0 0 auto;flex-direction:column;align-items:center;margin:0;padding:0}.app-header{margin:6px auto 0;gap:6px}.app-logo{width:22px;height:22px;border-radius:6px}.app-name{font-size:.95rem}.tabs{margin:4px auto 0;padding:0 12px;gap:6px}.tab{padding:6px 12px;font-size:13px}.layout{flex:1 1 auto;min-height:0;display:flex;flex-direction:column;align-items:stretch;gap:8px;margin:8px auto;padding:0 12px;width:100%}.visual-panel{flex:0 1 auto;min-height:0;max-height:62%;overflow-y:auto;width:100%;max-width:none;padding:8px 10px}.visual-panel h2{gap:5px;font-size:.95rem;margin:0 0 4px}.mistake-mascot{width:20px;height:20px;border-radius:5px}.practice-panel{flex:0 0 auto;width:100%;max-width:none;padding:12px}h1{font-size:1.15rem;margin-bottom:2px}.stats-line{margin-bottom:2px}.addition{margin:10px 0;gap:2px}.cell{width:42px;height:46px;font-size:1.8rem}.cell.sign{width:24px;font-size:1.5rem}.addition-divider{width:calc((var(--cols, 3) + 1) * 42px + 24px + var(--cols, 3) * 8px)}.equation-horizontal{margin:14px 0 10px;gap:8px}.equation-horizontal .num{font-size:2rem}.equation-horizontal .op{font-size:1.6rem}.practice-panel button{margin-top:8px;padding:8px 16px}.chat-panel{flex:1 1 0;min-height:64px;overflow:hidden;height:auto;width:100%;max-width:none;padding:10px}.chat-header{margin-bottom:6px}.teacher-avatar{width:24px;height:24px;border-radius:6px}.count-helper{padding:8px 10px;margin-bottom:8px}.count-helper-title{font-size:13px;margin-bottom:4px}.count-row{gap:3px;margin-bottom:4px;line-height:1.2}.count-plus,.count-number{font-size:.9rem}.icon-grid{grid-template-columns:repeat(9,1fr);gap:2px}.icon-cell{font-size:1.15rem}.icon-count{min-width:11px;font-size:.55rem;line-height:11px;bottom:-3px;right:-1px}.carry-note{margin-top:4px;padding-top:4px}}