:root{--math-ink: #243653;--math-muted: #60728b;--math-blue: #5b49d4;--math-blue-dark: #4937ba;--math-mint: #d9f6e8;--math-peach: #fff0dd;--math-sky: #e5f3ff;--math-lavender: #efeaff;--math-cream: #fffaf1;--math-line: #dbe5ec;--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:#ddd5f7}.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:#fff;box-shadow:0 5px #4131a8}.math-button--primary:hover:not(:disabled){background:var(--math-blue-dark)}.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:#5d478b}.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 #d6c6f6;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 #dad2f4;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 transparent;border-radius:11px;font-weight:850;color:var(--math-ink)}.math-fact-cell:disabled{opacity:1}.math-fact-cell--unseen{background:#edf1f4}.math-fact-cell--visual{background:#dceeff;border-color:#add4f6}.math-fact-cell--prompted{background:#efe6ff;border-color:#d5c0fc}.math-fact-cell--independent{background:#d6f0f0;border-color:#9ed9dc}.math-fact-cell--fast{background:#d6f3df;border-color:#a1dcb3}.math-fact-cell--mastered{background:#bceacd;border-color:#65c48b}.math-fact-cell--review{background:#ffe9c7;border-color:#f3c079}.math-fact-map__legend{display:flex;justify-content:center;flex-wrap:wrap;gap:8px 14px;margin-top:15px;color:var(--math-muted);font-size:.79rem}.math-fact-map__legend span{display:inline-flex;align-items:center;gap:5px}.math-fact-map__legend i{width:12px;height:12px;display:inline-block;border-radius:4px}.math-fact-map--compact .math-fact-cell{width:37px;height:37px;font-size:.77rem}.math-fact-map--compact 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 #dcebf7;border-radius:20px;background:#f7fbff}.math-drag-board>p{margin:0 0 10px}.math-drag-board__pool{display:flex;flex-wrap:wrap;gap:9px;min-height:64px;padding:11px;border:2px dashed #a4c6e4;border-radius:15px;background:#fff}.math-drag-item{min-height:44px;display:inline-flex;align-items:center;gap:5px;padding:7px 12px;border:2px solid #b4d8f4;border-radius:11px;background:#eaf5ff;color:var(--math-ink);font-weight:800}.math-drag-item--selected{border-color:#f0a04e;background:#fff0db}.math-drag-board__targets{display:flex;flex-wrap:wrap;gap:13px;margin-top:15px}.math-drag-target{flex:1 1 175px;min-width:160px;min-height:125px;padding:9px;border:2px solid #a9d9ca;border-radius:16px;background:#fff}.math-drag-target__drop{width:100%;min-height:52px;display:flex;flex-direction:column;align-items:center;justify-content:center;border:0;border-radius:10px;background:#e5f7ec;color:var(--math-ink);font-weight:850}.math-drag-target__drop small{font-size:.76rem;font-weight:550;color:var(--math-muted)}.math-drag-target__items{display:flex;flex-wrap:wrap;justify-content:center;gap:5px;margin-top:10px}.math-match__columns{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:clamp(10px,3vw,30px)}.math-match__columns>div{display:flex;flex-direction:column;gap:9px}.math-match h3{margin:0 0 4px;font-size:.95rem;text-align:center}.math-match-card{min-height:58px;padding:10px;border:2px solid #bcd9f2;border-radius:14px;background:#fff;color:var(--math-ink);font-size:clamp(1rem,2.4vw,1.3rem);font-weight:850}.math-match-card--selected{border-color:#f29c45;background:#fff0d9}.math-match-card--matched{background:#d9f3e2;border-color:#99d4aa}.math-choice-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,150px),1fr));gap:11px}.math-choice{min-height:63px;display:flex;align-items:center;justify-content:center;gap:8px;padding:10px;border:2px solid #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:#6d5ed3;background:#f0edff;box-shadow:0 0 0 3px #6d5ed31c}.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 13px}.math-step-animation{border:1px solid #dcebf7;border-radius:20px;background:#fff;overflow:hidden}.math-step-animation__stage{min-height:180px;display:flex;align-items:center;justify-content:center;gap:17px;padding:clamp(16px,3vw,27px);background:#f6faff}.math-step-animation__visual{flex:1 1 45%;min-width:0}.math-step-animation__copy{flex:1 1 45%}.math-step-animation__copy h3{margin:5px 0;font-size:1.28rem}.math-step-animation__copy p{margin:0}.math-step-animation__controls{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;padding:12px}.math-step-animation>.math-helper-text{margin:0 15px 13px;text-align:center}.math-narration{display:flex;justify-content:space-between;align-items:center;gap:13px;padding:13px 16px;border-left:5px solid #74bed1;border-radius:13px;background:#e8f8fb}.math-narration p{margin:0}.math-narration__speak{min-height:41px;flex:0 0 auto;padding:7px 11px;border:1px solid #8cc9d7;border-radius:10px;color:#1b6579;background:#fff;font-weight:750}.math-strategy-steps{padding:18px;border:1px solid #dbd5f1;border-radius:18px;background:#f8f5ff}.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:#d7c7fa;color:#4c3a7e;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:#9473d5;background:#f5efff}.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}}:root{font-family:Microsoft YaHei,PingFang SC,Noto Sans CJK SC,system-ui,sans-serif;color:#25243e;background:#f7f5ff;font-synthesis:none}*{box-sizing:border-box}body{margin:0;min-width:320px}button,input,select{font:inherit}button{cursor:pointer}a{color:inherit}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #7256e8;outline-offset:3px}.app-shell{min-height:100dvh;padding-bottom:90px}.app-header{background:linear-gradient(110deg,#6150d9,#8475e9);color:#fff;padding:18px max(18px,calc((100vw - 1120px)/2));display:flex;align-items:center;justify-content:space-between;gap:16px}.app-brand{display:flex;align-items:center;gap:10px;font-size:1.18rem;font-weight:800;text-decoration:none}.app-brand-mark{display:grid;place-items:center;width:38px;height:38px;border-radius:13px;background:#fff;color:#5b49d4;font-size:1.2rem}.app-header-right{display:flex;align-items:center;gap:10px;flex-wrap:wrap;justify-content:flex-end}.app-profile-select{max-width:150px;border:0;border-radius:12px;padding:8px 10px;background:#fff;color:#322b83;font-weight:700}.app-sync{display:inline-flex;align-items:center;gap:6px;font-size:.82rem;font-weight:700;padding:8px 10px;border-radius:12px;background:#ffffff31}.app-sync.pending,.app-sync.offline,.app-sync.error{background:#ffecc8;color:#684412}.app-content{width:min(1120px,calc(100% - 32px));margin:26px auto 0}.app-nav{position:fixed;z-index:20;left:50%;transform:translate(-50%);bottom:max(10px,env(safe-area-inset-bottom));display:flex;gap:3px;padding:7px;border-radius:22px;box-shadow:0 12px 34px #2b245033;background:#fff;max-width:calc(100vw - 20px);overflow-x:auto}.app-nav a{min-width:75px;min-height:55px;padding:6px 8px;border-radius:16px;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:1px;text-decoration:none;font-size:.76rem;font-weight:800;color:#635e81;white-space:nowrap}.app-nav a.active{background:#ece8ff;color:#5040be}.app-nav .emoji{font-size:1.22rem}.page-title{font-size:clamp(1.65rem,3vw,2.3rem);line-height:1.25;margin:0 0 10px}.page-subtitle{color:#686681;margin:0 0 22px;line-height:1.7}.page-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(260px,100%),1fr));gap:16px}.page-card{background:#fff;border:1px solid #e7e3fc;border-radius:24px;padding:22px;box-shadow:0 5px 20px #352a7509}.page-card h2,.page-card h3{margin-top:0}.page-card p{line-height:1.7}.hero-card{background:linear-gradient(130deg,#e7dfff,#d9efff);border-color:#dbd4fd}.hero-card .hero-illustration{font-size:clamp(2.2rem,10vw,4rem);line-height:1;margin:8px 0 20px;white-space:nowrap}.callout{padding:14px 16px;border-radius:16px;background:#f1edff;color:#40348d;line-height:1.6}.muted{color:#6e6b85}.small{font-size:.86rem}.eyebrow{color:#6353c9;font-size:.8rem;font-weight:900;letter-spacing:.03em}.big-number{font-size:2.4rem;line-height:1;font-weight:900;color:#5746ca}.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:#fff;background:#5b49d4}.button.secondary{color:#5140bc;background:#f0ecff}.button.outline{color:#5140bc;background:#fff;border-color:#cec7f9}.button.danger{color:#a2384a;background:#fff0f2}.field{display:grid;gap:6px;font-weight:700}.field input,.field select{min-height:48px;border:2px solid #d8d2f7;border-radius:13px;padding:9px 12px;background:#fff;color:#25243e}.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:#eeeafa;color:#5a50a0;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 #e5e0f9;border-radius:15px;background:#fff;text-decoration:none}.lesson-link:hover{background:#f7f4ff}.lesson-link.locked{opacity:.58;cursor:default}.progress-track{width:100%;height:10px;border-radius:99px;background:#e9e4fb;overflow:hidden}.progress-fill{height:100%;border-radius:inherit;background:linear-gradient(90deg,#7c68eb,#59b7d8)}.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%,#dce9ff,transparent 35%),radial-gradient(circle at 90% 90%,#eadfff,transparent 40%),#f7f5ff}.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:#e8e4fa;overflow:hidden}.chart-bar span{display:block;height:100%;background:#7763e2;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 #eceaf5}@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}}