:root{color:#262824;font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;--bg:#f7f6f2;--surface:#fffefa;--text:#262824;--muted:#73766d;--line:#e2e3dc;--green:#48634e;--green-soft:#eaf0e7;--error:#9b483d;--error-bg:#f8eeea;--study-size:24px;--reading-width:720px;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;background:#f7f6f2;font-family:PingFang SC,Microsoft YaHei,sans-serif}:root[data-theme=dark]{--bg:#1e211e;--surface:#252925;--text:#e6e8df;--muted:#a5ac9f;--line:#3b423b;--green:#aec6a6;--green-soft:#303e30;--error:#edb2a6;--error-bg:#3c2a27;color:var(--text);background:var(--bg);--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*{box-sizing:border-box}body{min-width:320px;margin:0}button,input,textarea,select{font:inherit;color:inherit}button,a,input,textarea,select,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer;border:1px solid var(--line);background:0 0;border-radius:5px;padding:10px 17px;font-size:14px;line-height:1.45;transition:background .12s,color .12s,border-color .12s}button:hover:not(:disabled),.button-label:hover{background:var(--green-soft);border-color:var(--green)}button:disabled{opacity:.45;cursor:not-allowed}button.primary{background:var(--green);color:var(--bg);border-color:var(--green)}button.primary:hover:not(:disabled){filter:brightness(1.1)}button.large{padding:14px 30px;font-size:16px}.text-button{color:var(--muted);background:0 0;border-color:#0000;padding:6px 8px}a{color:var(--green);text-underline-offset:4px}:is(button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible){outline:2px solid var(--green);outline-offset:4px}h1,h2,h3,p{margin-top:0}h1{letter-spacing:-1.2px;font-weight:500;line-height:1.5}h2{letter-spacing:.1px;font-size:20px;font-weight:500}h3{font-size:17px;font-weight:500}p{line-height:1.8}label{font-size:14px;line-height:1.6;display:block}label>input:not([type=checkbox]):not([type=radio]):not([type=range]),label>textarea,label>select{width:100%;margin-top:8px}input,select,textarea{border:1px solid var(--line);background:var(--surface);border-radius:4px;padding:11px 12px;font-size:14px}textarea{resize:vertical;min-height:88px;line-height:1.8;display:block}input[type=checkbox],input[type=radio]{accent-color:var(--green);flex-shrink:0;width:17px;height:17px}input[type=range]{accent-color:var(--green);width:100%;margin-top:12px;padding:0}fieldset{border:0;min-width:0;margin:0;padding:0}fieldset>label{margin:24px 0}.muted{color:var(--muted)}.small{font-size:12px;line-height:1.8}.eyebrow{letter-spacing:2px;color:var(--muted);margin-bottom:18px;font-size:11px;font-weight:500}.inline-actions{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.preserve-text{white-space:pre-wrap;overflow-wrap:anywhere}.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}.skip-link{z-index:50;background:var(--surface);padding:12px;position:fixed;top:-100px;left:20px}.skip-link:focus{top:12px}.brand{letter-spacing:5px;white-space:nowrap;align-items:baseline;gap:14px;font-size:23px;display:flex}.brand-sub{letter-spacing:1px;color:var(--muted);font-size:10px}.workspace{grid-template-columns:188px minmax(0,1fr);min-height:100vh;display:grid}.rail{border-right:1px solid var(--line);flex-direction:column;height:100vh;padding:44px 24px 28px 32px;display:flex;position:sticky;top:0}.rail .brand{display:block}.rail .brand-sub{margin-top:9px;display:block}.rail nav{flex-direction:column;gap:14px;margin-top:66px;display:flex}.rail nav a{color:var(--muted);align-items:center;gap:17px;padding:12px 0;font-size:14px;text-decoration:none;display:flex}.rail nav a.active{color:var(--text)}.nav-number{letter-spacing:1px;color:var(--muted);width:19px;font-size:10px}.rail nav a.active .nav-number{color:var(--green)}.rail-foot{color:var(--muted);white-space:nowrap;margin-top:auto;font-size:11px;line-height:2.3}.rail-foot>span:last-child{font-size:10px}.local-mark{background:var(--green);vertical-align:middle;border-radius:50%;width:5px;height:5px;margin-right:8px;display:inline-block}.workspace-main{min-width:0;max-width:1500px;padding:56px clamp(28px,5vw,82px) 70px}.page-heading{justify-content:space-between;align-items:center;gap:22px;margin-bottom:40px;display:flex}.page-heading .eyebrow{margin-bottom:13px}.page-heading h1{margin-bottom:13px;font-size:32px}.page-heading p:last-child{margin-bottom:0;font-size:13px}.loading{color:var(--muted);padding:20vh 0}.welcome{max-width:860px;padding:clamp(36px,9vh,100px) 0 60px}.welcome h1{margin:24px 0;font-size:clamp(28px,3.4vw,44px)}.welcome-copy{color:var(--muted);font-size:16px;line-height:2}.start-area{margin-top:48px}.scope-picker{gap:18px;max-width:510px;margin-bottom:26px;display:flex}.scope-picker label{color:var(--muted);flex:1;font-size:12px}.start-area>.small{margin-top:20px}.session-summary{border-top:1px solid var(--line);border-bottom:1px solid var(--line);flex-wrap:wrap;align-items:baseline;gap:24px;margin-top:36px;padding:20px 0;display:flex}.session-summary p{color:var(--muted);margin:0;font-size:13px}.session-summary strong{font-size:27px;font-weight:500}.session-summary strong span,.summary-time{color:var(--muted);font-size:12px;font-weight:400}.focus-shell{max-width:1120px;margin:auto;padding:0 40px}.focus-header{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;padding:30px 0;display:flex}.focus-note{color:var(--muted);letter-spacing:.4px;font-size:11px}.study-page{max-width:var(--reading-width);margin:auto;padding-bottom:60px}.study-toolbar{justify-content:space-between;align-items:center;gap:14px;padding:26px 0;font-size:12px;display:flex}.study-toolbar>.muted{overflow-wrap:anywhere}.study-content{padding-top:38px;animation:.2s ease-out appear}.item-meta{color:var(--muted);align-items:center;gap:16px;margin-bottom:23px;font-size:11px;display:flex}.item-meta span:first-child{border:1px solid var(--line);white-space:nowrap;border-radius:3px;padding:4px 8px}.prompt{font-size:calc(var(--study-size) + 4px);letter-spacing:.1px;white-space:pre-wrap;overflow-wrap:anywhere;margin-bottom:34px;font-weight:500;line-height:1.8}.options{flex-direction:column;gap:12px;display:flex}.option{text-align:left;line-height:1.8;font-size:calc(var(--study-size) - 5px);white-space:pre-wrap;overflow-wrap:anywhere;background:0 0;border-radius:5px;align-items:baseline;gap:17px;padding:16px 18px;display:flex}.option>span:nth-child(2){flex:1;min-width:0}.option-key{color:var(--muted);flex-shrink:0;min-width:13px;font-size:12px}.option.selected{background:var(--green-soft);border-color:var(--green)}.option:disabled{opacity:1;cursor:default}.option.correct-option{border-color:var(--green);background:var(--green-soft)}.option.wrong-option{border-color:var(--error);background:var(--error-bg)}.option small{color:var(--muted);white-space:nowrap;font-size:10px}.study-controls{border-top:1px solid var(--line);align-items:center;gap:22px;margin-top:38px;padding-top:24px;display:flex}.keyboard-hint{color:var(--muted);font-size:11px}.answer-area{border-top:1px solid var(--line);margin-top:32px;padding-top:26px}.result{color:var(--green);margin-bottom:17px;font-size:12px}.result.incorrect{color:var(--error)}.answer-text{font-size:var(--study-size);white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.9}.answer-label{margin-top:23px;margin-bottom:10px}.explanation{font-size:calc(var(--study-size) - 5px);white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.9}.source{overflow-wrap:anywhere;margin-top:25px}.rating-area{border-top:1px solid var(--line);margin-top:34px;padding-top:22px}.rating-buttons{grid-template-columns:repeat(4,1fr);gap:10px;display:grid}.rating-buttons button{justify-content:space-between;align-items:center;gap:8px;padding:14px 16px;display:flex}.rating-buttons button.preferred{border-color:var(--green);color:var(--green)}kbd{color:var(--muted);font-family:inherit;font-size:10px}.study-empty{padding-top:90px}.study-empty h1{font-size:28px}.study-empty .inline-actions{margin-top:32px}.menu{position:relative}.menu summary{cursor:pointer;color:var(--muted);white-space:nowrap;padding:7px 6px;font-size:12px;list-style:none}.menu summary::-webkit-details-marker{display:none}.menu[open] summary{color:var(--green)}.menu-panel{z-index:10;border:1px solid var(--line);background:var(--surface);border-radius:5px;min-width:160px;padding:6px;position:absolute;top:100%;right:0}.menu-panel button{text-align:left;white-space:nowrap;border:0;border-radius:3px;width:100%;padding:10px 12px;font-size:12px;display:block}.danger-text{color:var(--error)}.error-notice{background:var(--error-bg);border-left:2px solid var(--error);color:var(--error);margin:24px 0;padding:15px 18px;font-size:13px}.error-notice p{margin-bottom:10px}.error-notice button{color:var(--error);border-color:currentColor;padding:4px 10px;font-size:12px}.success-notice{border-left:2px solid var(--green);background:var(--green-soft);padding:14px 18px;font-size:13px}.library-top{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:18px;padding-bottom:24px;display:flex}.segmented{flex-wrap:wrap;gap:4px;display:inline-flex}.segmented button{color:var(--muted);border-color:#0000;padding:8px 12px;font-size:12px}.segmented button.active{background:var(--green-soft);color:var(--green)}.text-link{padding:6px;font-size:12px;text-decoration:none}.library-top .text-button{font-size:12px}.filters{grid-template-columns:minmax(180px,1fr) repeat(3,minmax(90px,145px));gap:12px;margin-bottom:25px;display:grid}.filters select,.filters input{min-height:42px;margin:0!important}.filters .search-field{min-width:0}.list-caption{color:var(--muted);border-bottom:1px solid var(--line);justify-content:space-between;gap:16px;padding:6px 0 14px;font-size:11px;display:flex}.content-row{border-bottom:1px solid var(--line);grid-template-columns:66px minmax(0,1fr) 128px 40px;align-items:center;gap:18px;padding:25px 0;display:grid}.row-type{flex-direction:column;align-items:flex-start;gap:7px;display:flex}.type-tag{color:var(--muted);white-space:nowrap;border:1px solid var(--line);border-radius:3px;padding:3px 7px;font-size:10px;line-height:1.6;display:inline-block}.row-title{text-align:left;white-space:pre-wrap;overflow-wrap:anywhere;background:0 0;border:0;border-radius:0;padding:0;font-size:15px;line-height:1.8;display:block}.row-title:hover:not(:disabled){color:var(--green);background:0 0}.row-details{color:var(--muted);flex-wrap:wrap;align-items:center;gap:8px;margin-top:10px;font-size:10px;display:flex}.tag{border-left:1px solid var(--line);padding-left:8px}.row-schedule{flex-direction:column;gap:7px;font-size:11px;display:flex}.row-schedule .small{font-size:10px}.library-empty{padding:70px 0}.empty-index{letter-spacing:2px;color:var(--muted);font-size:11px}.library-empty h2{margin-top:24px;font-size:24px}.library-empty>.muted{font-size:14px}.library-empty .inline-actions{margin-top:28px}.dialog{border:1px solid var(--line);background:var(--bg);color:var(--text);overscroll-behavior:contain;border-radius:8px;width:min(600px,100vw - 32px);max-height:90vh;padding:0;overflow:auto}.dialog.wide{width:min(740px,100vw - 32px)}.dialog::backdrop{-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);background:#171d1759}.dialog-header{border-bottom:1px solid var(--line);background:var(--bg);z-index:2;justify-content:space-between;align-items:center;padding:23px 28px;display:flex;position:sticky;top:0}.dialog-header h2{margin:0;font-size:20px}.editor-form,.import-body,.preview-content,.collection-form,.restore-content{padding:24px 28px 0}.form-row{grid-template-columns:1fr 1fr;gap:20px;display:grid}.form-row label{min-width:0}.optional{color:var(--muted);margin-left:10px;font-size:10px}.field-label{margin-bottom:8px;font-size:14px}.field-label>.small{margin-top:5px;display:block}.option-editor{margin:24px 0}.option-editor-row{align-items:center;gap:12px;margin:12px 0;display:flex}.option-editor-row>input{flex:1;min-width:0}.correct-toggle{flex-shrink:0;align-items:center;gap:10px;min-width:35px;font-size:12px;display:flex}.option-editor .text-button{font-size:12px}.dialog-footer{border-top:1px solid var(--line);justify-content:flex-end;gap:10px;margin-top:24px;padding:20px 0;display:flex}.template-links{gap:24px;margin:20px 0;font-size:12px;display:flex}.import-body>label{margin:24px 0}.file-picker{border:1px dashed var(--line);padding:20px}.file-picker input{background:0 0;border:0;max-width:100%;margin-top:14px;padding:0;font-size:12px;display:block}.import-preview{border-top:1px solid var(--line);padding-top:24px;font-size:13px}.validation-errors{background:var(--error-bg);color:var(--error);padding:16px;font-size:12px}.validation-errors p{margin:0}.validation-errors ul{max-height:170px;padding-left:20px;line-height:2;overflow:auto}.valid-text{color:var(--green)}.duplicate-list{max-height:140px;padding-left:20px;font-size:12px;line-height:2;overflow:auto}.checkbox-label{align-items:center;gap:10px;font-size:12px;display:flex}.sample-list{margin-top:25px}.sample-list .type-tag{margin-right:12px}.sample-list>p{overflow-wrap:anywhere}.sample-list>p:not(.eyebrow){border-bottom:1px solid var(--line);margin:0;padding:10px 0;font-size:12px}.preview-prompt{white-space:pre-wrap;overflow-wrap:anywhere;font-size:23px;line-height:1.8}.preview-content{padding-bottom:25px}.preview-content>.preserve-text{font-size:16px;line-height:1.9}.preview-options{margin:20px 0 30px;padding:0;list-style:none}.preview-options li{border-bottom:1px solid var(--line);white-space:pre-wrap;overflow-wrap:anywhere;padding:12px 0;font-size:14px}.answer-mark{color:var(--green);margin-left:16px;font-size:10px;display:inline-block}.preview-content>.small:last-child{border-top:1px solid var(--line);margin-top:25px;padding-top:18px}.metrics{border-top:1px solid var(--line);border-bottom:1px solid var(--line);grid-template-columns:repeat(4,1fr);gap:24px;margin:15px 0 42px;padding:28px 0;display:grid}.metrics>div>span{color:var(--muted);margin-bottom:18px;font-size:12px;display:block}.metrics strong{white-space:nowrap;font-size:31px;font-weight:400}.metrics small{color:var(--muted);font-size:10px;font-weight:400}.metrics .time-metric{font-size:23px}.record-section{border-bottom:1px solid var(--line);margin-bottom:28px;padding-bottom:28px}.section-heading{flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:20px;display:flex}.section-heading h2{margin-bottom:25px}.section-heading .small{font-size:10px}.bar-chart{gap:12px;padding:12px 4px 0;display:flex}.bar-column{text-align:center;flex:1;min-width:0}.bar-value{color:var(--muted);height:22px;font-size:10px;display:block}.bar-track{border-bottom:1px solid var(--line);justify-content:center;align-items:flex-end;height:125px;display:flex}.bar{background:var(--green);opacity:.8;border-radius:2px 2px 0 0;width:clamp(6px,60%,38px);min-height:0}.bar-label{color:var(--muted);height:16px;margin-top:12px;font-size:10px;display:block}.bar-chart.days-30{gap:5px}.chart-table{color:var(--muted);margin-top:16px;font-size:12px}.chart-table summary{cursor:pointer}.chart-table table{border-collapse:collapse;width:100%;margin-top:14px}.chart-table th,.chart-table td{border-bottom:1px solid var(--line);text-align:left;padding:9px;font-weight:400}.record-columns{grid-template-columns:1.2fr 1fr;gap:44px;display:grid}.forecast-list{margin:7px 0 24px}.forecast-row{align-items:center;gap:14px;margin-bottom:17px;font-size:11px;display:flex}.forecast-row>span:first-child{width:90px;color:var(--muted);flex-shrink:0}.forecast-row>span:last-child{text-align:right;flex-shrink:0;width:36px}.forecast-track{background:var(--line);border-radius:2px;flex:1;height:4px}.forecast-track>span{background:var(--green);opacity:.6;border-radius:2px;height:100%;display:block}.feedback-list{grid-template-columns:1fr 1fr;gap:25px;padding:18px 0 22px;display:grid}.feedback-list>div>span{color:var(--muted);margin-bottom:8px;font-size:11px;display:block}.feedback-list strong{font-size:23px;font-weight:400}.feedback-list small{color:var(--muted);font-size:10px}.history-row{border-bottom:1px solid var(--line)}.history-row>summary{cursor:pointer;align-items:baseline;gap:16px;padding:20px 0;list-style:none;display:flex}.history-row>summary::-webkit-details-marker{display:none}.history-prompt{overflow-wrap:anywhere;flex:1;font-size:13px}.history-result{white-space:nowrap;color:var(--green);font-size:11px}.history-row.undone .history-result{color:var(--muted)}.history-row time{white-space:nowrap;color:var(--muted);font-size:10px}.history-detail{padding:0 0 15px 63px;font-size:13px}.empty-record{padding:25px 0;font-size:13px}.settings-section{border-top:1px solid var(--line);grid-template-columns:200px minmax(0,520px);gap:32px;padding:32px 0 38px;display:grid}.settings-description h2{font-size:18px}.settings-description p{font-size:12px;line-height:2}.settings-form label{margin-bottom:25px}.range-value{float:right;color:var(--muted);font-size:11px}.settings-form>button{margin-top:8px}.settings-data{min-width:0;font-size:14px}.settings-data>.field-label{margin-bottom:12px}.data-path{background:var(--surface);border:1px solid var(--line);word-break:break-all;padding:12px;font-family:inherit;font-size:12px;line-height:1.8;display:block}.settings-data>.small{margin-top:18px}.settings-data .inline-actions{margin-top:24px}.button-label{border:1px solid var(--line);cursor:pointer;border-radius:5px;padding:10px 17px;font-size:14px;line-height:1.45}.button-label:focus-within{outline:2px solid var(--green);outline-offset:4px}.button-label.disabled{opacity:.45;cursor:not-allowed}.backup-list{margin-top:28px;font-size:12px}.backup-list summary{cursor:pointer;color:var(--muted)}.backup-list ul{max-height:240px;padding:0;list-style:none;overflow:auto}.backup-list li{border-bottom:1px solid var(--line);word-break:break-all;padding:10px 0;font-size:10px}.restore-content{font-size:14px}.restore-content strong{overflow-wrap:anywhere}.collection-form{padding-top:24px}@keyframes appear{0%{opacity:.3;transform:translateY(3px)}to{opacity:1;transform:none}}@media (prefers-reduced-motion:reduce){*,:before,:after{transition:none!important;animation:none!important}}@media (min-width:1600px){.workspace-main{width:100%}.welcome{padding-top:12vh}}@media (max-width:1050px){.workspace{grid-template-columns:160px minmax(0,1fr)}.rail{padding-left:24px;padding-right:18px}.workspace-main{padding:42px 28px}.page-heading{flex-direction:column;align-items:flex-start;gap:22px}.content-row{grid-template-columns:55px minmax(0,1fr) 104px 35px;gap:12px}.row-schedule{font-size:10px}.metrics{grid-template-columns:1fr 1fr;row-gap:28px}.record-columns{gap:25px}.settings-section{grid-template-columns:160px minmax(0,1fr);gap:24px}.filters{grid-template-columns:1fr 1fr}.filters .search-field,.filters>label:last-child{grid-column:1/-1}.history-row>summary{gap:10px}}@media (max-width:700px){.workspace{display:block}.rail{border-right:0;border-bottom:1px solid var(--line);height:auto;padding:20px 22px;position:static}.rail .brand{font-size:21px;display:flex}.rail .brand-sub{margin-top:0}.rail nav{flex-direction:row;gap:24px;margin-top:23px;overflow-x:auto}.rail nav a{white-space:nowrap;gap:0;padding:5px 0;font-size:12px}.nav-number,.rail-foot{display:none}.workspace-main{padding:32px 22px 50px}.page-heading{margin-bottom:30px}.page-heading h1{font-size:28px}.welcome{padding-top:35px}.welcome h1{letter-spacing:-1px;font-size:30px}.welcome-copy{font-size:14px}.start-area{margin-top:35px}.scope-picker{gap:12px}.focus-shell{padding:0 22px}.focus-header{padding:20px 0}.focus-note{display:none}.study-toolbar{padding:20px 0}.study-toolbar .inline-actions{flex-wrap:nowrap;gap:4px}.study-content{padding-top:25px}.item-meta{gap:12px;font-size:10px}.prompt{font-size:var(--study-size);margin-bottom:26px}.option{font-size:calc(var(--study-size) - 5px);flex-wrap:wrap;gap:12px;padding:14px 13px}.option small{margin-left:25px}.rating-buttons{gap:8px}.rating-buttons button{justify-content:center;padding:12px 4px;font-size:12px}.rating-buttons kbd{display:none}.study-controls{gap:14px}.keyboard-hint{display:none}.library-top{align-items:flex-start;gap:14px}.library-top .segmented{margin-left:-9px}.segmented button{padding:8px 9px}.filters{gap:10px}.list-caption>span:last-child{display:none}.content-row{grid-template-columns:48px minmax(0,1fr) 36px;gap:10px;padding:23px 0}.row-title{font-size:14px}.row-schedule{flex-direction:row;grid-column:2;gap:10px}.row-menu{grid-area:1/3/3;align-self:center}.row-type{align-self:start}.row-details{gap:7px}.dialog-header{padding:20px}.editor-form,.import-body,.preview-content,.collection-form,.restore-content{padding-left:20px;padding-right:20px}.form-row{grid-template-columns:1fr;gap:20px}.form-row label{margin:0}.form-row+.form-row{margin-top:22px}.metrics{gap:25px}.metrics strong{font-size:26px}.metrics .time-metric{font-size:20px}.record-columns{grid-template-columns:1fr;gap:0}.history-row>summary{flex-wrap:wrap;gap:10px}.history-prompt{flex-basis:calc(100% - 65px)}.history-result{margin-left:56px}.history-detail{padding-left:0}.settings-section{grid-template-columns:1fr;gap:14px}.settings-description p br{display:none}.settings-description h2{margin-bottom:10px}.settings-data>.inline-actions,.bar-chart{gap:8px}.bar-chart.days-30{gap:3px}.days-30 .bar-value{font-size:8px}.days-30 .bar-label{letter-spacing:-1px;font-size:8px}.session-summary{gap:14px}}:root[data-theme]{color:var(--text);background:var(--bg)}:root[data-theme=white]{--bg:#fff;--surface:#fff;--text:#202522;--muted:#69756d;--line:#e4e9e5;--green:#42624c;--green-soft:#edf3ee;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}:root[data-theme=sage]{--bg:#f0f5ef;--surface:#f8fbf6;--text:#263a2d;--muted:#637760;--line:#d9e5d6;--green:#456950;--green-soft:#e1ecdf;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}:root[data-theme=mist]{--bg:#f0f4f8;--surface:#f9fbfd;--text:#263846;--muted:#607486;--line:#d7e1ea;--green:#486b86;--green-soft:#e0eaf3;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}:root[data-theme=sand]{--bg:#fbf2e5;--surface:#fffaf1;--text:#453b2d;--muted:#7b6e58;--line:#e9ddc8;--green:#87643d;--green-soft:#f0e4ce;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}:root[data-theme=rose]{--bg:#faf0ef;--surface:#fff9f7;--text:#493735;--muted:#826c68;--line:#eadbd7;--green:#96605c;--green-soft:#f0dfdc;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}:root[data-theme=slate]{--bg:#202b35;--surface:#283641;--text:#e4edf3;--muted:#a5bac8;--line:#3b4b59;--green:#abc9dc;--green-soft:#314756;--error:#edb2a6;--error-bg:#462f31;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}.focus-shell{width:100%;max-width:none;min-height:100svh;margin:0;padding:0}.focus-shell>main{outline:none}.focus-shell .loading{place-items:center;min-height:100svh;padding:0;font-size:13px;display:grid}.study-page{--corner-x:clamp(18px, 3vw, 40px);--corner-y:clamp(18px, 3vh, 32px);width:100%;max-width:none;min-height:100svh;color:var(--text);background:var(--bg);margin:0;padding:0;position:relative}.study-viewport{min-height:100svh;box-sizing:border-box;flex-direction:column;justify-content:center;align-items:center;width:100%;min-height:100dvh;padding:clamp(92px,12svh,132px) clamp(24px,5vw,64px);display:flex}.study-page .study-content{width:100%;max-width:var(--reading-width);margin:0;padding:0;animation:none;position:relative}.study-page .prompt{font-size:var(--study-size);letter-spacing:.1px;text-align:center;white-space:pre-wrap;overflow-wrap:anywhere;margin:0;font-weight:500;line-height:1.85}.study-page .options{gap:10px;margin-top:30px}.study-page .option{font-size:calc(var(--study-size) - 2px);align-items:baseline;gap:16px;padding:13px 17px}.study-page .option>span:nth-child(2){flex:1;min-width:0}.study-page .option-indicator{color:var(--green);flex:0 0 18px;align-self:center;display:inline-flex}.study-page .wrong-option .option-indicator{color:var(--error)}.study-page .study-controls{border:0;justify-content:center;width:100%;margin:0;padding:0;display:flex;position:absolute;top:calc(100% + 28px);left:0}.icon-button{width:42px;height:42px;color:var(--muted);background:0 0;border:1px solid #0000;border-radius:8px;flex:none;justify-content:center;align-items:center;padding:0;line-height:1;display:inline-flex;position:relative}.icon-button svg{stroke-width:1.65px;flex-shrink:0}.icon-button:hover:not(:disabled){color:var(--text);background:var(--green-soft);border-color:#0000}.study-page .learning-primary{width:48px;height:48px;color:var(--bg);border-color:var(--green);background:var(--green);border-radius:50%}.study-page .learning-primary:hover:not(:disabled){color:var(--bg);background:var(--green);filter:brightness(1.08)}.study-page .answer-area{border-top:1px solid var(--line);margin-top:32px;padding-top:26px;position:relative}.study-page .answer-text,.study-page .explanation{font-size:var(--study-size);text-align:left;white-space:pre-wrap;overflow-wrap:anywhere;margin:0;line-height:1.9}.study-page .answer-text+.explanation{color:var(--muted);margin-top:22px}.study-page .answer-result{color:var(--green);justify-content:center;margin-bottom:14px;display:flex}.study-page .answer-result.incorrect{color:var(--error)}.study-page .rating-area{text-align:center;border:0;margin-top:27px;padding:0 0 12px}.study-page .rating-buttons{justify-content:center;gap:16px;display:flex}.study-page .rating-buttons .icon-button{border:1px solid var(--line);border-radius:8px;width:48px;height:46px;padding:0}.study-page .rating-buttons .icon-button.preferred{border-color:var(--green);color:var(--green)}.rating-caption{white-space:nowrap;color:var(--muted);opacity:0;pointer-events:none;font-size:11px;line-height:1.4;position:absolute;top:calc(100% + 8px);left:50%;transform:translate(-50%)}:is(.rating-buttons .icon-button:hover .rating-caption,.rating-buttons .icon-button:focus-visible .rating-caption){opacity:1}.study-tools{z-index:25;align-items:center;gap:7px;display:flex;position:fixed}.study-tools[hidden]{display:none!important}.corner-top-left{top:max(var(--corner-y), env(safe-area-inset-top));left:max(var(--corner-x), env(safe-area-inset-left))}.corner-top-right{top:max(var(--corner-y), env(safe-area-inset-top));right:max(var(--corner-x), env(safe-area-inset-right))}.corner-bottom-left{bottom:max(var(--corner-y), env(safe-area-inset-bottom));left:max(var(--corner-x), env(safe-area-inset-left))}.corner-bottom-right{bottom:max(var(--corner-y), env(safe-area-inset-bottom));right:max(var(--corner-x), env(safe-area-inset-right));z-index:35;position:fixed}.tool-visibility-toggle .icon-button{opacity:.55}:is(.tool-visibility-toggle .icon-button:hover,.tool-visibility-toggle .icon-button:focus-visible){opacity:1}.study-popover{z-index:30;bottom:calc(var(--corner-y) + 56px);left:var(--corner-x);overscroll-behavior:contain;background:var(--surface);border:1px solid var(--line);border-radius:10px;width:300px;max-width:calc(100vw - 36px);max-height:calc(100dvh - 160px);padding:17px;position:fixed;overflow:auto}.study-popover.panel-navigation{top:calc(var(--corner-y) + 56px);width:236px;bottom:auto}.study-popover.panel-font,.study-popover.panel-theme{top:calc(var(--corner-y) + 56px);bottom:auto;left:auto;right:var(--corner-x)}.study-popover.panel-theme{width:320px}.popover-title{justify-content:space-between;align-items:center;gap:15px;margin-bottom:15px;display:flex}.popover-title h2{letter-spacing:.3px;margin:0;font-size:13px;font-weight:500}.popover-title .icon-button{border-radius:4px;width:28px;height:28px}.study-navigation,.study-action-menu{flex-direction:column;gap:3px;display:flex}.study-navigation a,.study-action-menu>button{width:100%;color:var(--text);text-align:left;background:0 0;border:0;border-radius:5px;align-items:center;gap:12px;padding:10px 9px;font-size:13px;line-height:1.6;text-decoration:none;display:flex}.study-navigation a:hover,.study-action-menu>button:hover:not(:disabled){background:var(--green-soft)}.study-navigation a svg,.study-action-menu>button svg{color:var(--muted);stroke-width:1.65px;flex-shrink:0}.theme-picker{grid-template-columns:repeat(4,minmax(0,1fr));gap:11px 7px;display:grid}.theme-choice{width:100%;min-width:0;color:var(--muted);border-color:#0000;border-radius:6px;flex-direction:column;align-items:center;gap:8px;padding:5px;font-size:11px;display:flex}.theme-choice.chosen{border-color:var(--green);color:var(--text)}.theme-preview{border:1px solid var(--line);border-radius:4px;width:100%;height:39px;display:block;position:relative}.theme-preview>span{border-radius:1px;display:block;position:absolute;left:7px}.theme-preview>span:first-child{width:40%;height:3px;top:12px}.theme-preview>span:last-child{opacity:.6;width:65%;height:2px;top:20px}.font-stepper{justify-content:space-between;align-items:center;padding:9px 0 17px;display:flex}.font-stepper output{color:var(--text);font-size:28px;font-weight:400}.font-stepper output>span{color:var(--muted);margin-left:6px;font-size:11px}.font-controls input[type=range]{margin:5px 0 12px}.study-popover .scope-picker{grid-template-columns:1fr;gap:15px;max-width:none;margin:0;display:grid}.study-popover .scope-picker p{margin:0;font-size:11px}.study-info p{white-space:pre-wrap;overflow-wrap:anywhere;margin:0 0 10px;font-size:12px}.shortcut-list{margin:0;font-size:12px}.shortcut-list>div{justify-content:space-between;align-items:center;gap:12px;margin:14px 0;display:flex}.shortcut-list dd{white-space:nowrap;margin:0}.shortcut-list kbd{background:var(--green-soft);color:var(--text);border-radius:3px;padding:3px 6px}.study-notices{right:var(--corner-x);bottom:calc(var(--corner-y) + 57px);z-index:40;width:min(420px,100vw - 36px);max-height:calc(100dvh - 180px);position:fixed;overflow:auto}.study-notices:empty{display:none}.study-notices .error-notice{margin:0 0 10px;font-size:12px}.study-welcome{text-align:center;width:100%;max-width:var(--reading-width)}.study-welcome h1,.study-page .study-empty h1{letter-spacing:0;margin:0 0 26px;font-size:20px;font-weight:400;line-height:1.8}.study-page .launch-button{background:var(--green);width:64px;height:64px;color:var(--bg);border-color:var(--green);border-radius:50%;padding:0}.study-page .study-empty{text-align:center;width:100%;max-width:var(--reading-width);padding:0}.empty-controls{justify-content:center;gap:16px;display:flex}@media (pointer:coarse){.rating-caption{opacity:1}.study-page .rating-area{padding-bottom:20px}}@media (max-width:700px){.focus-shell{padding:0}.study-viewport{padding:92px 24px}.study-page .options{margin-top:23px}.study-page .option{gap:12px;padding:12px 13px}.study-page .answer-area{margin-top:26px;padding-top:22px}.study-page .rating-buttons{gap:13px}.study-tools .icon-button,.tool-visibility-toggle .icon-button{width:42px;height:42px}.study-page .study-empty h1{font-size:17px}.study-page .study-controls{top:calc(100% + 25px)}}.structured-editor fieldset{border:0;gap:18px;min-width:0;padding:0;display:grid}.structured-editor h3{margin:24px 0 0}.unit-editor,.mask-preview{border:1px solid var(--line);border-radius:10px;gap:14px;margin:12px 0;padding:18px;display:grid}.unit-editor .inline-actions{flex-wrap:wrap;align-items:end}.unit-editor input[type=number]{width:88px}.unit-chips{flex-wrap:wrap;gap:8px;margin:12px 0;display:flex}.unit-chips button,.unit-chips>span{border:1px solid var(--line);text-align:left;overflow-wrap:anywhere;border-radius:8px;padding:8px 12px}.unit-chips button[aria-pressed=true]{background:var(--green);color:var(--bg);border-color:currentColor}.exercise-option-editor{border-top:1px solid var(--line);gap:12px;padding-top:14px;display:grid}.path-management{grid-template-columns:1fr 1fr;gap:24px;padding-top:16px;display:grid}.path-management section{align-content:start;gap:12px;min-width:0;display:grid}.path-management input[type=number]{max-width:120px}.path-reading{font-size:var(--study-size,24px);margin:28px 0;line-height:1.9}.structured-study{padding-block:60px}.structured-study .study-controls{flex-wrap:wrap}.structured-study .unit-chips{font-size:16px}.structured-study .study-controls>p{flex-basis:100%}.structured-study .eyebrow{text-align:center}@media (max-width:640px){.path-management{grid-template-columns:1fr}.structured-study{padding-block:70px}.unit-editor{padding:12px}}.unit-chips .wrong-unit{border-color:var(--error);color:var(--error)}