:root{color:#18384a;font-synthesis:none;--ink:#18384a;--muted:#667983;--teal:#087c70;--line:#dde5e7;--paper:#fff;--wash:#e7f3ee;--danger:#a53730;--radius:12px;background:#f3f6f7;font-family:Segoe UI,Tahoma,Arial,sans-serif;font-size:15px;font-weight:400;line-height:1.5}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}button,a,input,select,summary{-webkit-tap-highlight-color:transparent}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline-offset:3px;outline:3px solid #37a799}button{transition:background-color .15s,color .15s}button svg{flex:none}h1,h2,h3,p{margin:0}h1{letter-spacing:-1px;font-size:34px;font-weight:620;line-height:1.2}h2{letter-spacing:-.35px;font-size:22px;font-weight:620;line-height:1.35}h3{font-size:16px;font-weight:650}p{max-width:78ch}input:not([type=radio]):not([type=checkbox]),select{width:100%;color:var(--ink);background:#fff;border:1px solid #cbd7da;border-radius:7px;min-height:46px;padding:12px 13px;display:block}input::placeholder{color:#849299}select{cursor:pointer}label{margin-bottom:7px;font-size:14px;font-weight:600;display:block}fieldset{border:0;min-width:0;margin:0;padding:0}form>input,form>select{margin-bottom:18px}input[type=checkbox],input[type=radio]{accent-color:var(--teal);flex:none;width:18px;height:18px}details summary{cursor:pointer;list-style:none}details summary::-webkit-details-marker{display:none}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.primary-button,.secondary-button,.quiet-button,.danger-button,.text-button,.icon-button{border:1px solid #0000;border-radius:7px;justify-content:center;align-items:center;gap:10px;min-height:43px;padding:11px 17px;font-size:14px;font-weight:650;line-height:1.3;text-decoration:none;display:inline-flex}.primary-button{background:var(--teal);color:#fff}.primary-button:hover:not(:disabled){background:#05665d}.secondary-button{color:var(--ink);background:#fff;border-color:#cbd7da}.secondary-button:hover:not(:disabled){background:#edf4f4}.quiet-button{color:var(--muted);background:0 0;padding:9px 11px}.quiet-button:hover:not(:disabled){color:var(--ink);background:#e7eeef}.danger-button{color:var(--danger);background:#fff4f3;border-color:#ebc6c1}.danger-button:hover:not(:disabled){background:#f8e2de}.text-button{color:var(--ink);white-space:nowrap;background:0 0;min-height:34px;padding:5px;text-decoration:underline}.icon-button{min-height:34px;color:var(--muted);background:0 0;border:0;padding:7px}.full{width:100%}.button-row{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.small-label{color:var(--muted);margin-bottom:8px;font-size:13px;font-weight:550}.small-dot{background:var(--teal);border-radius:50%;flex:none;width:7px;height:7px;display:inline-block}.field-note{color:var(--muted);margin-top:12px;font-size:12px;line-height:1.6}.empty-text{color:var(--muted);padding:22px 0}.loading{min-height:120px;color:var(--muted);justify-content:center;align-items:center;gap:12px;display:flex}.spin{animation:1s linear infinite rotate}@keyframes rotate{to{transform:rotate(360deg)}}.error-notice{color:#8c3024;background:#fff1ee;border:1px solid #efc9c0;border-radius:8px;align-items:flex-start;gap:10px;margin:16px 0;padding:14px 16px;font-size:14px;display:flex}.error-notice>svg{flex:none;margin-top:2px}.error-notice p{flex:1}.error-notice button{color:inherit}.brand{white-space:nowrap;letter-spacing:-1px;align-items:center;gap:11px;font-size:25px;font-weight:690;line-height:1.15;display:flex}.brand small{letter-spacing:.35px;color:var(--muted);margin-top:4px;font-size:10px;font-weight:450;display:block}.brand-symbol{background:var(--teal);color:#fff;border-radius:10px 10px 10px 3px;justify-content:center;align-items:center;width:40px;height:40px;display:flex}
.welcome{flex-direction:column;max-width:1440px;min-height:100vh;margin:auto;padding:0 72px;display:flex}.welcome-header{justify-content:space-between;align-items:center;height:110px;display:flex}.prototype-tag{color:var(--muted);border:1px solid #d6e0e2;border-radius:30px;padding:6px 12px;font-size:12px}.welcome-main{flex:1;grid-template-columns:1fr 390px;align-items:center;gap:70px;padding:35px 0 60px;display:grid}.welcome-story{max-width:650px}.course-label{color:var(--muted);align-items:center;gap:10px;margin-bottom:23px;font-size:13px;display:flex}.welcome-story h1{letter-spacing:-2.8px;font-size:clamp(46px,5vw,68px);font-weight:630;line-height:1.06}.welcome-lead{max-width:410px;color:var(--muted);margin-top:27px;font-size:17px;line-height:1.7}.fraction-note{align-items:center;gap:12px;width:fit-content;margin:35px 0 26px;padding:19px 0;display:flex;position:relative}.fraction-disc{background:conic-gradient(from 0deg, var(--teal) 0deg 180deg, #dce8e7 180deg 360deg);border-radius:50%;width:68px;height:68px;position:relative;box-shadow:inset 0 0 0 1px #fff}.fraction-disc:after{content:"";background:var(--paper);width:2px;position:absolute;top:0;bottom:0;left:calc(50% - 1px)}.fraction-disc.quarters:before{content:"";background:var(--paper);z-index:1;height:2px;position:absolute;top:calc(50% - 1px);left:0;right:0}.fraction-text{color:var(--ink);font-family:Georgia,serif;font-size:36px;line-height:1}.fraction-equals{color:var(--muted);margin:0 10px;font-family:Georgia,serif;font-size:25px}.note-caption{color:var(--muted);border-left:1px solid var(--line);margin-left:12px;padding-left:17px;font-size:12px}.welcome-benefits{color:var(--muted);flex-direction:column;gap:10px;padding:0;font-size:13px;list-style:none;display:flex}.welcome-benefits li{align-items:center;gap:9px;display:flex}.welcome-benefits svg{color:var(--teal)}.entry-panel{background:#fff;border:1px solid #e0e6e7;border-radius:16px;padding:32px;box-shadow:0 12px 44px #17384806}.entry-panel h2{font-size:24px}.entry-panel>p{color:var(--muted);margin:11px 0 24px;font-size:14px;line-height:1.65}.entry-panel>.field-note{margin:12px 0 0;font-size:11px}.entry-panel .field-label{align-items:center;gap:7px;font-size:13px;display:flex}.entry-panel select{margin-bottom:13px}.entry-divider{color:#809097;white-space:nowrap;align-items:center;gap:10px;margin:25px 0 19px;font-size:11px;display:flex}.entry-divider:before,.entry-divider:after{content:"";background:var(--line);flex:1;height:1px}.tabs{border-bottom:1px solid var(--line);gap:22px;margin-bottom:20px;display:flex}.tabs button{color:var(--muted);background:0 0;border:0;border-bottom:2px solid #0000;border-radius:0;padding:0 0 9px;font-size:13px;font-weight:600}.tabs button.active{border-color:var(--teal);color:var(--teal)}.welcome-footer{border-top:1px solid var(--line);color:var(--muted);justify-content:space-between;padding:24px 0;font-size:12px;display:flex}.welcome-footer span{align-items:center;gap:8px;display:flex}
.app-header{background:var(--paper);border-bottom:1px solid var(--line);z-index:2;justify-content:space-between;align-items:center;height:80px;padding:0 38px;display:flex;position:relative}.app-header .brand{font-size:24px}.header-right{align-items:center;gap:30px;display:flex}.header-role{color:var(--muted);font-size:13px}.workspace{grid-template-columns:280px minmax(0,1fr);max-width:1600px;min-height:calc(100vh - 80px);margin:auto;display:grid}.course-sidebar{border-right:1px solid var(--line);background:#f8fafb;flex-direction:column;padding:30px 23px 20px 29px;display:flex}.profile-line{align-items:center;gap:11px;margin-bottom:28px;display:flex}.avatar{color:#416164;background:#dfecec;border-radius:50%;flex:none;justify-content:center;align-items:center;width:38px;height:38px;font-weight:650;display:flex}.profile-line strong{overflow-wrap:anywhere;font-size:14px;display:block}.profile-line span{color:var(--muted);font-size:11px;display:block}.main-nav{flex-direction:column;gap:4px;display:flex}.main-nav button{text-align:left;color:var(--muted);background:0 0;border:none;border-radius:7px;align-items:center;gap:12px;padding:12px;font-size:13px;font-weight:580;display:flex}.main-nav button.selected{color:#09675e;background:#e1eeeb}.main-nav button:hover{background:#e9f0f1}.sidebar-course{border-top:1px solid var(--line);margin-top:31px;padding-top:27px}.sidebar-course h2{margin:0 0 23px;font-size:15px}.skill-list{margin:0;padding:0;list-style:none}.skill-list li{align-items:flex-start;gap:11px;padding-bottom:24px;display:flex;position:relative}.skill-list li:not(:last-child):after{content:"";background:#cfdbdf;width:1px;height:calc(100% - 26px);position:absolute;top:28px;left:12px}.skill-node{color:#778a93;background:#f8fafb;border:1px solid #cddade;border-radius:50%;flex:none;justify-content:center;align-items:center;width:26px;height:26px;font-size:11px;font-weight:550;display:flex}.skill-list li.current .skill-node,.skill-list li.provisional .skill-node{background:var(--teal);border-color:var(--teal);color:#fff}.skill-list li.developing:not(.current) .skill-node{color:var(--teal);border-color:#83b9ae}.skill-list strong{margin-top:3px;font-size:12px;font-weight:580;line-height:1.4;display:block}.skill-list li.current strong{color:var(--teal)}.skill-list li div>span{color:var(--muted);margin-top:4px;font-size:11px;display:block}.sidebar-note{color:#7e8f97;margin:0 0 24px;font-size:11px;line-height:1.7}.sidebar-foot{color:#7e8f97;align-items:flex-start;gap:8px;margin-top:auto;padding-top:25px;font-size:11px;display:flex}.sidebar-foot svg{flex:none}.learner-main{width:100%;max-width:1080px;margin:0 auto;padding:28px 48px 45px;position:relative}.initial-state{max-width:800px;margin:auto;padding:40px}.demo-banner{color:#627981;background:#eaf0f1;border:1px solid #e0e8ea;border-radius:6px;align-items:center;gap:10px;margin-bottom:28px;padding:10px 14px;font-size:12px;display:flex}.demo-banner svg{flex:none}.page-heading{justify-content:space-between;align-items:center;gap:20px;margin-bottom:28px;display:flex}.page-heading .quiet-button{white-space:nowrap;font-size:12px}.phase-track{flex-wrap:wrap;gap:18px;margin:0;padding:0 0 25px;list-style:none;display:flex}.phase-track li{color:#819098;align-items:center;gap:7px;font-size:11px;display:flex}.phase-track li>span{border:1px solid #cbd7da;border-radius:50%;justify-content:center;align-items:center;width:20px;height:20px;font-size:10px;display:flex}.phase-track li.current{color:var(--teal);font-weight:650}.phase-track li.current>span{background:var(--teal);color:#fff;border-color:var(--teal)}.phase-track li.done{color:#527872}.phase-track li.done>span{background:#deeeea;border-color:#deeeea}
.task-paper{background:#fff;border:1px solid #dfe6e8;border-radius:12px;overflow:hidden;box-shadow:0 5px 20px #18384a03}.task-meta{color:var(--muted);justify-content:space-between;gap:16px;padding:20px 30px;font-size:12px;display:flex}.task-meta>span:first-child{color:var(--ink);font-weight:600}.task-count{white-space:nowrap}.session-progress{background:#e7eeef;height:3px}.session-progress>span{background:#61a99a;height:3px;transition:width .2s;display:block}.task-content{padding:34px 40px 40px}.task-kind{color:var(--muted);margin-bottom:16px;font-size:12px}.problem-prompt{letter-spacing:-.35px;white-space:pre-line;max-width:650px;margin-bottom:28px;font-size:25px;font-weight:560;line-height:1.55}.answer-options{grid-template-columns:1fr 1fr;gap:12px;margin-bottom:25px;display:grid}.answer-option{cursor:pointer;overflow-wrap:anywhere;border:1px solid #d6e0e3;border-radius:8px;align-items:center;gap:14px;min-height:64px;margin:0;padding:15px 18px;font-size:18px;font-weight:450;display:flex;position:relative}.answer-option:hover{background:#f8fbfa;border-color:#85b4a9}.answer-option.chosen{background:#edf6f3;border:2px solid #3e9d8d;padding:14px 17px}.answer-option input{opacity:0;width:1px;height:1px;position:absolute}.answer-option:focus-within{outline-offset:2px;outline:3px solid #37a799}.option-number{width:24px;height:24px;color:var(--muted);background:#eef2f3;border-radius:4px;flex:none;justify-content:center;align-items:center;font-size:11px;display:flex}.chosen .option-number{color:var(--teal);background:#d1e8df}.answer-field{max-width:390px;margin-bottom:25px}.answer-field label{font-size:13px}.answer-field input{min-height:57px!important;font-size:20px!important}.check-answer{min-width:196px}.task-bottom{background:#fbfcfc;border-top:1px solid #e5ebed;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;padding:17px 24px;display:flex}.task-tools{align-items:center;gap:7px;display:flex}.task-tools button{padding:8px;font-size:12px}.why{color:var(--muted);font-size:12px;position:relative}.why summary{align-items:center;gap:7px;padding:8px 0;display:flex}.why>p{border:1px solid var(--line);background:#fff;border-radius:8px;max-width:380px;margin-top:6px;padding:15px;line-height:1.65;box-shadow:0 10px 30px #1738480a}.why[open]{flex-basis:100%}.why[open] p{max-width:100%}.saved-note{color:#62827a;align-items:center;gap:7px;font-size:12px;display:flex}.hints{flex-direction:column;gap:12px;margin-top:25px;display:flex}.hint{background:#fff8e8;border-left:3px solid #ddb962;align-items:flex-start;gap:12px;padding:16px 18px;font-size:14px;line-height:1.7;display:flex}.hint svg{color:#967332;flex:none;margin-top:3px}.hint strong{color:#8b6b34;font-size:12px}.hint p{white-space:pre-line;margin-top:4px}.feedback{white-space:pre-line;border-radius:8px;align-items:flex-start;gap:13px;margin-top:25px;padding:21px 22px;font-size:14px;line-height:1.65;display:flex}.feedback.success{color:#25624f;background:#eaf5ef}.feedback.try-again{color:#855821;background:#fff5e8}.feedback.neutral{color:#466575;background:#edf2f6}.feedback-icon{flex:none;padding-top:2px}.feedback h3{margin-bottom:7px;font-size:16px}.feedback-note{opacity:.9;margin-top:12px;font-size:12px}.next-button{margin-top:25px}.bottom-note{color:#82929a;align-items:center;gap:8px;margin-top:20px;font-size:11px;display:flex}.bottom-note svg{flex:none}.start-paper{background:#fff;border:1px solid #e0e7e9;border-radius:12px;align-items:flex-start;gap:36px;padding:40px;display:flex}.start-illustration{width:87px;height:116px;color:var(--teal);background:#e5f0ed;border-radius:43px 43px 12px 12px;flex-direction:column;flex:none;justify-content:center;align-items:center;margin-top:4px;font-family:Georgia,serif;font-size:33px;line-height:1.2;display:flex}.fraction-bar{background:#64978e;width:32px;height:2px;margin:5px 0}.start-description h2{max-width:450px;font-size:24px;line-height:1.4}.start-description>p{color:var(--muted);max-width:530px;margin:15px 0 24px;font-size:14px;line-height:1.75}.duration-label{color:var(--muted);align-items:center;gap:7px;font-size:12px;display:flex}.duration-select{max-width:165px;margin-bottom:20px}.start-button{width:fit-content;max-width:100%}.practice-count{background:#f2f7f6;border-radius:6px;padding:10px 13px;font-size:12px!important}.schedule-note{color:#597282;background:#eef3f6;align-items:flex-start;gap:9px;margin:20px 0;padding:14px;font-size:13px;display:flex}.schedule-note svg{flex:none;margin-top:2px}.schedule-note small{margin-top:6px;font-size:11px;display:block}.demo-advance{margin-top:15px;font-size:12px;display:flex}.session-summary{color:var(--muted);gap:12px;padding:20px 5px;font-size:13px;display:flex}.session-summary svg{color:#699687;flex:none;margin-top:3px}.session-summary strong{color:var(--ink);font-weight:600}.session-summary p{margin-top:4px;font-size:12px}
.progress-intro{background:#e7f0ed;border-radius:9px;align-items:flex-start;gap:20px;margin-bottom:33px;padding:28px 30px;display:flex}.progress-intro>svg{color:var(--teal);flex:none;margin-top:4px}.progress-intro h2{font-size:21px}.progress-intro p{color:#59716c;margin-top:10px;font-size:14px;line-height:1.7}.progress-skills h2,.results-section h2,.decision-history h2{margin-bottom:19px;font-size:20px}.progress-row{border-bottom:1px solid var(--line);grid-template-columns:1fr auto;align-items:center;gap:8px 15px;padding:21px 0;display:grid}.progress-row strong{font-size:14px;font-weight:600}.progress-row p{color:var(--muted);margin-top:6px;font-size:12px}.progress-row>small{color:var(--muted);font-size:11px}.skill-status{color:#73868e;white-space:nowrap;background:#e8edf0;border-radius:5px;padding:5px 9px;font-size:11px}.skill-status.developing{color:#8f753c;background:#f9efd8}.skill-status.provisional{color:#367562;background:#e0eee8}.results-section{margin-top:35px}.results-list{border:1px solid var(--line);background:#fff;border-radius:9px;grid-template-columns:repeat(3,1fr);display:grid;overflow:hidden}.results-list>div{border-right:1px solid var(--line);flex-direction:column;padding:25px;display:flex}.results-list>div:last-child{border:0}.results-list span{color:var(--muted);font-size:12px}.results-list strong{margin:9px 0;font-size:36px;font-weight:600}.results-list strong small{color:#819099;font-size:18px;font-weight:400}.results-list>div>small{color:var(--muted);font-size:11px}.decision-history{margin-top:35px}.decision-history details{border-bottom:1px solid var(--line);padding:15px 0;font-size:13px}.decision-history summary{justify-content:space-between;gap:12px;display:flex}.decision-history p{color:var(--muted);margin:12px 0;line-height:1.7}.decision-history small{color:var(--muted);font-size:11px}.settings-paper{border:1px solid var(--line);background:#fff;border-radius:10px;padding:30px}.settings-paper h2{font-size:22px}.settings-paper dl{margin:24px 0}.settings-paper dl>div{border-bottom:1px solid #eef2f3;gap:25px;padding:10px 0;font-size:13px;display:flex}.settings-paper dt{width:46%;color:var(--muted)}.settings-paper dd{flex:1;margin:0}.settings-action{border-top:1px solid var(--line);justify-content:space-between;align-items:center;gap:25px;padding:26px 0;display:flex}.settings-action h3{font-size:15px}.settings-action p{color:var(--muted);max-width:410px;margin-top:8px;font-size:13px}.settings-action button{flex:none;font-size:12px}.danger-zone h3{color:var(--danger)}.confirm-box{background:#fff1ee;border:1px solid #efc9c0;border-radius:7px;padding:18px}.confirm-box h3{margin-bottom:15px;font-size:14px}.operation-indicator{background:var(--ink);color:#fff;z-index:10;border-radius:24px;align-items:center;gap:9px;padding:10px 17px;font-size:12px;display:flex;position:fixed;bottom:20px;right:25px}
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