:root{--math-ink: #29465a;--math-muted: #617887;--math-blue: #b7e2f3;--math-blue-dark: #2f7089;--math-mint: #d9f6e8;--math-peach: #fff0dd;--math-sky: #e5f3ff;--math-lavender: #edf7fc;--math-cream: #f8fcff;--math-line: #dcebf1;--math-shadow: 0 10px 28px rgb(35 73 120 / 9%);color-scheme:light}.math-site-shell,.math-site-shell *{box-sizing:border-box}.math-site-shell{min-height:100vh;background:radial-gradient(circle at 92% 5%,#edf6ff 0,transparent 32%),var(--math-cream);color:var(--math-ink);font-family:Nunito,Microsoft YaHei,PingFang SC,system-ui,sans-serif;line-height:1.55}.math-site-shell button,.math-site-shell input{font:inherit}.math-site-shell button{cursor:pointer}.math-site-shell button:disabled{cursor:default;opacity:.54}.math-site-shell :focus-visible{outline:3px solid #ef9a46;outline-offset:3px}.math-site-header{min-height:78px;display:flex;align-items:center;justify-content:space-between;padding:12px clamp(18px,4vw,56px);background:#fff;border-bottom:1px solid var(--math-line)}.math-brand{display:inline-flex;align-items:center;gap:10px;color:var(--math-ink);text-decoration:none;font-size:1.4rem;font-weight:900;letter-spacing:.02em}.math-brand__mark{width:42px;height:42px;display:grid;place-items:center;border-radius:14px;background:#f7b955;color:#5d3b08;font-size:1.5rem;transform:rotate(-8deg)}.math-site-header__tagline{color:var(--math-muted);font-size:.95rem}.math-site-layout{display:grid;grid-template-columns:196px minmax(0,1fr);gap:clamp(18px,3vw,40px);max-width:1500px;margin:0 auto;padding:clamp(16px,3vw,36px)}.math-side-nav{display:flex;flex-direction:column;align-self:start;gap:8px;position:sticky;top:22px}.math-side-nav a{min-height:50px;display:flex;align-items:center;gap:12px;padding:9px 15px;border-radius:15px;color:var(--math-ink);text-decoration:none;font-weight:750}.math-side-nav a:hover{background:#fff}.math-side-nav a[aria-current=page]{color:var(--math-blue-dark);background:var(--math-sky)}.math-side-nav a span:first-child{font-size:1.3rem;width:27px;text-align:center}.math-main{min-width:0;padding-bottom:48px}.math-page-heading{display:flex;align-items:end;justify-content:space-between;gap:16px;margin:5px 0 26px}.math-page-heading h1{margin:5px 0 4px;font-size:clamp(1.8rem,3vw,2.7rem);letter-spacing:-.02em;line-height:1.23}.math-page-heading p{margin:0;color:var(--math-muted)}.math-page-heading__actions{display:flex;flex-wrap:wrap;gap:9px}.math-eyebrow{color:var(--math-blue-dark);font-size:.82rem;letter-spacing:.05em;font-weight:850}.math-card{padding:clamp(18px,2.4vw,28px);border:1px solid var(--math-line);border-radius:24px;background:#fff;box-shadow:var(--math-shadow)}.math-card--peach{background:var(--math-peach);border-color:#f9dcc0}.math-card--mint{background:var(--math-mint);border-color:#b9ead0}.math-card--lavender{background:var(--math-lavender);border-color:#d5eaf4}.math-card--sky{background:var(--math-sky);border-color:#c7e3f8}.math-button{min-height:47px;display:inline-flex;align-items:center;justify-content:center;gap:7px;border:2px solid transparent;border-radius:14px;padding:9px 17px;font-weight:850;line-height:1.2;text-align:center;transition:transform .15s ease,background-color .15s ease}.math-button:not(:disabled):active{transform:scale(.97)}.math-button--primary{background:var(--math-blue);color:#194a61;box-shadow:0 5px #91c6db}.math-button--primary:hover:not(:disabled){background:#a4d8ed}.math-button--secondary{background:#fff;border-color:#a6cff6;color:var(--math-blue-dark)}.math-button--secondary:hover:not(:disabled){background:#eef7ff}.math-button--quiet{color:var(--math-blue-dark);background:transparent}.math-button--quiet:hover:not(:disabled){background:#eaf3fd}.math-pill{display:inline-flex;align-items:center;padding:4px 10px;border-radius:999px;font-size:.79rem;font-weight:800}.math-pill--sky{background:var(--math-sky);color:#155593}.math-pill--mint{background:var(--math-mint);color:#11644b}.math-pill--peach{background:var(--math-peach);color:#8b4c08}.math-pill--lavender{background:var(--math-lavender);color:#37677c}.math-pill--neutral{background:#eff2f5;color:#50617a}.math-progress{width:100%;height:13px;overflow:hidden;background:#e8eef2;border-radius:999px}.math-progress>span{height:100%;display:block;border-radius:inherit;background:linear-gradient(90deg,#52c8a6,#5aa8f6);transition:width .3s ease}.math-helper-text{color:var(--math-muted);font-size:.93rem}.math-inline-actions{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:10px;margin-top:14px}.math-visual{margin:0;padding:clamp(16px,3vw,28px);border-radius:21px;background:#f6faff;border:1px solid #dcebf7;text-align:center}.math-visual__caption{display:flex;flex-direction:column;align-items:center;gap:4px;margin-top:16px;color:var(--math-muted)}.math-visual__caption strong{font-size:clamp(1.25rem,2.8vw,2rem);color:var(--math-ink);letter-spacing:.02em}.math-visual__action{margin-top:17px}.math-group-list{display:flex;align-items:stretch;justify-content:center;flex-wrap:wrap;gap:12px}.math-group{min-width:96px;min-height:102px;display:flex;flex-direction:column;align-items:center;gap:10px;padding:11px;border:2px solid #b9daf3;border-radius:19px;background:#fff}.math-group:nth-child(3n+2){border-color:#f3d6ad}.math-group:nth-child(3n+3){border-color:#c5e7d5}.math-group--waiting{background:#f4f6f8;border-style:dashed}.math-group__label{color:#426488;font-size:.88rem;font-weight:800}.math-group__objects{display:flex;justify-content:center;align-content:center;align-items:center;flex-wrap:wrap;gap:6px;max-width:150px;min-height:39px}.math-object{min-width:23px;min-height:23px;display:inline-grid;place-items:center;color:#f08c50;font-size:1.3rem;line-height:1}.math-object--large{font-size:2.1rem;touch-action:none}.math-array-controls{display:flex;justify-content:center;flex-wrap:wrap;gap:9px;margin-bottom:20px}.math-stepper{display:flex;align-items:center;gap:8px;padding:5px 9px;border-radius:15px;background:#fff;border:1px solid var(--math-line)}.math-stepper>span{margin-right:3px;font-weight:750}.math-stepper button{width:35px;height:35px;border:0;border-radius:10px;color:var(--math-blue-dark);background:var(--math-sky);font-size:1.2rem}.math-stepper strong{min-width:23px;font-size:1.2rem}.math-array-grid{display:flex;flex-direction:column;align-items:center;gap:clamp(4px,1vw,9px);overflow-x:auto}.math-array-row{display:flex;gap:clamp(4px,1vw,9px);flex:0 0 auto}.math-array-dot{width:clamp(17px,3vw,28px);height:clamp(17px,3vw,28px);border-radius:50%;background:#67aaf2;border:2px solid #3884d1;box-shadow:inset 0 -3px #1a568f26;animation:math-dot-enter .25s backwards;animation-delay:calc(var(--dot-index) * 18ms)}.math-array-row:nth-child(2n) .math-array-dot{background:#7bd3ac;border-color:#4da987}.math-array-row--waiting{visibility:hidden}@keyframes math-dot-enter{0%{transform:scale(.4);opacity:0}to{transform:scale(1);opacity:1}}.math-number-line svg{width:100%;max-width:760px;height:auto;overflow:visible}.math-number-line__axis,.math-number-line__tick{stroke:#5a718e;stroke-width:3}#math-arrowhead path{fill:#5a718e}.math-number-line__jump{fill:none;stroke:#f09a52;stroke-width:4;stroke-linecap:round}.math-number-line text{fill:var(--math-ink);font-size:18px;font-weight:800}.math-number-line .math-number-line__jump-label{fill:#aa5b19;font-size:15px}.math-fact-family{display:flex;flex-direction:column;align-items:center;gap:17px;padding:20px;border-radius:22px;background:var(--math-lavender)}.math-fact-family__numbers{display:flex;justify-content:center;gap:13px}.math-fact-family__numbers span{width:54px;height:54px;display:grid;place-items:center;border:3px solid #bcdfea;border-radius:50%;background:#fff;font-size:1.4rem;font-weight:900}.math-fact-family__numbers span:last-child{background:#ffd46f;border-color:#f5bc44}.math-fact-family__equations{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px;width:min(100%,450px)}.math-fact-family__equations div{border:1px solid #cce5ee;border-radius:13px;background:#fff;padding:8px;font-size:1.16rem;font-weight:800;text-align:center}.math-fact-map__scroll{overflow-x:auto;padding-bottom:5px}.math-fact-map table{width:auto;border-collapse:separate;border-spacing:4px;margin:0 auto}.math-fact-map th{width:45px;height:42px;padding:0;border:0;color:#52708c;font-size:.92rem;text-align:center}.math-fact-map td{padding:0;border:0}.math-fact-cell{width:45px;height:45px;border:2px solid 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th{width:37px;height:37px}.math-distributor{padding:clamp(14px,2.5vw,24px);border:1px solid #dcebf7;border-radius:20px;background:#f7fbff}.math-distributor__source{display:flex;justify-content:space-between;align-items:center;gap:16px;max-width:650px;margin:0 auto 17px;padding:12px 18px;background:#fff;border:2px solid #f5cd86;border-radius:16px}.math-distributor__source div{display:flex;flex-direction:column}.math-distributor__source strong{font-size:1.17rem}.math-distributor__source span:not(.math-object){color:var(--math-muted);font-size:.86rem}.math-distributor__boxes{display:flex;justify-content:center;flex-wrap:wrap;gap:12px}.math-distributor__box{min-width:135px;flex:1 1 135px;max-width:210px;padding:8px;border:2px solid #b9d9f0;border-radius:18px;background:#fff;text-align:center}.math-distributor__drop{width:100%;min-height:105px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;border:0;border-radius:12px;background:#f1f8ff;color:var(--math-ink)}.math-distributor__drop:hover:not(:disabled){background:#e4f1ff}.math-distributor__box-label{font-weight:850}.math-distributor__box-items{display:flex;justify-content:center;flex-wrap:wrap;gap:2px;max-width:150px}.math-distributor__box-items i{font-size:1.2rem;font-style:normal;color:#f18a56;line-height:1.1}.math-distributor__placeholder{color:#6d91b0;font-size:.83rem}.math-text-button{min-height:35px;border:0;background:transparent;color:var(--math-blue-dark);font-size:.82rem;font-weight:750}.math-distributor__feedback{margin:17px 0 8px;text-align:center;font-weight:750}.math-distributor__feedback--complete{color:#176c4c}.math-drag-board{padding:16px;border:1px solid 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#c4dbe9;border-radius:17px;background:#fff;color:var(--math-ink);font-size:1.12rem;font-weight:850}.math-choice:hover:not(:disabled){background:#f4faff}.math-choice--selected{border-color:#75bedb;background:#eaf7fc;box-shadow:0 0 0 3px #75bedb24}.math-choice__symbol{font-size:1.4rem}.math-numeric-input{display:flex;align-items:end;flex-wrap:wrap;gap:10px}.math-numeric-input label{display:flex;flex:1 1 160px;flex-direction:column;gap:6px;color:var(--math-muted);font-size:.88rem;font-weight:750}.math-numeric-input input{width:100%;min-height:52px;padding:8px 15px;border:2px solid #b9d6e9;border-radius:13px;color:var(--math-ink);background:#fff;font-size:1.35rem;font-weight:850}.math-hint-panel{padding:17px;border:1px solid #eed8a6;border-radius:18px;background:#fff8e9}.math-hint-panel__title{display:flex;align-items:center;gap:8px;font-size:1.05rem}.math-hint-panel ol{display:grid;gap:7px;margin:11px 0 14px;padding-left:24px}.math-hint-panel p{margin:9px 0 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#8cc9d7;border-radius:10px;color:#1b6579;background:#fff;font-weight:750}.math-strategy-steps{padding:18px;border:1px solid #d8eaf1;border-radius:18px;background:#f5fbfe}.math-strategy-steps h3{margin:0 0 13px}.math-strategy-steps ol{display:grid;gap:11px;list-style:none;margin:0 0 13px;padding:0}.math-strategy-steps li{display:flex;align-items:start;gap:10px}.math-strategy-steps__number{width:30px;height:30px;flex:0 0 30px;display:grid;place-items:center;border-radius:50%;background:#ccecf6;color:#275e75;font-weight:850}.math-strategy-steps h4{margin:0}.math-strategy-steps p{margin:3px 0}.math-strategy-steps__equation{display:block;margin-top:4px;font-size:1.18rem}.math-strategy-choices{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,205px),1fr));gap:10px}.math-strategy-choice{min-height:83px;display:flex;flex-wrap:wrap;align-content:center;align-items:center;gap:4px 7px;padding:11px 13px;border:2px solid #c9d4ec;border-radius:15px;background:#fff;color:var(--math-ink);text-align:left}.math-strategy-choice--selected{border-color:#7bc2dc;background:#edf9fc}.math-strategy-choice strong{font-size:1.04rem}.math-strategy-choice small{width:100%;color:var(--math-muted)}@media(max-width:780px){.math-site-layout{display:block;padding:16px 15px 100px}.math-site-header{min-height:65px;padding:9px 16px}.math-site-header__tagline{display:none}.math-side-nav{position:fixed;z-index:20;inset:auto 0 0;flex-direction:row;justify-content:space-around;gap:2px;padding:7px max(8px,env(safe-area-inset-right)) calc(7px + env(safe-area-inset-bottom)) max(8px,env(safe-area-inset-left));border-top:1px solid var(--math-line);background:#fffffff5;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);box-shadow:0 -5px 22px #1c416b12}.math-side-nav a{min-width:55px;min-height:50px;flex:1 1 0;flex-direction:column;justify-content:center;gap:0;padding:3px 1px;border-radius:11px;font-size:.71rem;line-height:1.2;text-align:center}.math-side-nav a span:first-child{width:auto;font-size:1.2rem}.math-page-heading{align-items:start;flex-direction:column}.math-step-animation__stage{flex-direction:column}.math-step-animation__visual,.math-step-animation__copy{width:100%;flex-basis:auto}}@media(max-width:450px){.math-brand{font-size:1.16rem}.math-brand__mark{width:36px;height:36px}.math-fact-family__equations{grid-template-columns:1fr}.math-narration{align-items:start;flex-direction:column}.math-button{min-height:44px;padding:8px 12px}.math-step-animation__controls .math-button{flex:1 1 40%}}@media(prefers-reduced-motion:reduce){.math-array-dot{animation:none}.math-button,.math-progress>span{transition:none}}.reasoning-experiment,.reasoning-visual{min-width:0}.reasoning-visual{margin:0;padding:14px;border:1px solid #dbeaf2;border-radius:17px;background:#f5fbff}.reasoning-visual 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#cfe2eb;background:#fff;color:#29465a;font-weight:700;text-align:center;line-height:1.5;overflow-wrap:anywhere}.reasoning-card-button{min-height:54px;border-width:2px}.reasoning-card-button:hover:not(:disabled){background:#eff8fd;border-color:#87bbd3}.reasoning-card-button small{font-size:.85rem;font-weight:500}.reasoning-selected{background:#e1f3fc;border-color:#448aa8;box-shadow:0 0 0 1px #448aa8}.reasoning-token-target{border:2px dashed #8fbcd0;background:#edf8ff}.reasoning-dot{display:inline-block;flex:0 0 auto;width:24px;height:24px;border-radius:50%;border:1px solid #bbcdd5;background:#e3edf3}.reasoning-dot.red{background:#eea3a3;border-color:#b85e69}.reasoning-dot.blue{background:#94cbe9;border-color:#5488a7}.reasoning-dot.yellow{background:#f7d378;border-color:#bb9540}.reasoning-dot.empty{background:transparent;border-style:dashed}.reasoning-red{color:#b65363;font-size:1.6rem}.reasoning-blue{color:#337bab;font-size:1.6rem}.reasoning-number-input{width:min(160px,100%)}.reasoning-stair{display:grid;align-content:start;gap:8px;border:1px solid #d4e6ee;border-radius:16px;padding:14px;background:#fff;min-width:0}.reasoning-stair-next{width:fit-content;max-width:100%;background:#fff9e8}.reasoning-dot-row{display:flex;gap:6px;min-height:24px}.reasoning-new-layer{padding:7px;margin-left:-7px;border:1px dashed 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16px;border-radius:16px;background:#edf8fd;color:#315d72;line-height:1.6}.muted{color:#657b89}.small{font-size:.86rem}.eyebrow{color:#367b97;font-size:.8rem;font-weight:900;letter-spacing:.03em}.big-number{font-size:2.4rem;line-height:1;font-weight:900;color:#397f9d}.spaced{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap}.stack{display:grid;gap:14px}.row{display:flex;align-items:center;flex-wrap:wrap;gap:10px}.button{display:inline-flex;align-items:center;justify-content:center;min-height:48px;border-radius:14px;border:2px solid transparent;padding:10px 18px;font-weight:800;text-decoration:none;transition:transform .15s ease,background .15s ease}.button:hover{transform:translateY(-2px)}.button:disabled{opacity:.5;cursor:not-allowed;transform:none}.button.primary{color:#194a61;background:#b7e2f3;border-color:#97d0e7}.button.primary:hover:not(:disabled){background:#a4d8ed}.button.secondary{color:#2f6e86;background:#e9f7fc}.button.outline{color:#2f6e86;background:#fff;border-color:#b9dce9}.button.danger{color:#a2384a;background:#fff0f2}.field{display:grid;gap:6px;font-weight:700}.field input,.field select{min-height:48px;border:2px solid #cfe5ed;border-radius:13px;padding:9px 12px;background:#fff;color:#29465a}.feedback{border-radius:14px;padding:11px 13px;background:#e8faec;color:#175a2b;line-height:1.55}.feedback.error{background:#fff0ed;color:#8b3423}.feedback.warning{background:#fff5d8;color:#6d4b05}.status-pill{display:inline-block;border-radius:999px;padding:5px 10px;background:#eaf6fa;color:#3d758a;font-size:.78rem;font-weight:800}.status-pill.mastered{background:#dcf6e8;color:#176347}.status-pill.review{background:#fff0d4;color:#8a5d16}.status-pill.locked{background:#f0f0f3;color:#777781}.lesson-list{display:grid;gap:9px}.lesson-link{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:13px 15px;border:1px solid #dcecf2;border-radius:15px;background:#fff;color:inherit;text-align:left;line-height:1.5;text-decoration:none}.lesson-link>span:first-child{flex:1;min-width:0}.lesson-link>.status-pill{flex:0 0 auto;white-space:nowrap}.lesson-link:hover{background:#f3fbfe}.lesson-link.locked{opacity:.58;cursor:default}.progress-track{width:100%;height:10px;border-radius:99px;background:#e5f0f4;overflow:hidden}.progress-fill{height:100%;border-radius:inherit;background:linear-gradient(90deg,#91d7c0,#88c7e3)}.answer-feedback{font-size:1.02rem;font-weight:700}.answer-feedback.ok{color:#177b4c}.answer-feedback.try{color:#9c5417}.setup{min-height:100dvh;display:grid;place-items:center;padding:25px;background:radial-gradient(circle at 10% 15%,#e3f6ff,transparent 35%),radial-gradient(circle at 90% 90%,#fff3df,transparent 40%),#f8fcff}.setup-inner{width:min(760px,100%)}.setup-logo{font-size:3rem;margin-bottom:14px}.chart-row{display:grid;grid-template-columns:70px 1fr 40px;gap:10px;align-items:center;margin:9px 0;font-weight:700}.chart-bar{height:13px;border-radius:9px;background:#e5f0f4;overflow:hidden}.chart-bar span{display:block;height:100%;background:#8bc9dd;border-radius:inherit}.table-wrap{overflow-x:auto}table{border-collapse:collapse;width:100%}th,td{text-align:left;padding:10px;border-bottom:1px solid #e5eef2}@media(max-width:640px){.app-header{padding:14px 16px}.app-brand{font-size:1rem}.app-brand-mark{width:32px;height:32px}.app-header-right{gap:6px}.app-sync{font-size:.73rem;padding:6px 8px}.app-content{width:min(100% - 22px,1120px);margin-top:20px}.page-card{padding:18px;border-radius:19px}.app-nav a{min-width:62px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;animation-duration:.01ms!important;transition-duration:.01ms!important}}