:root{font-family:Segoe UI,Nirmala UI,system-ui,sans-serif;color:#17352b;background:#f5f9f6;font-synthesis:none;--bg:#f5f9f6;--surface:#fff;--soft:#e7f3ed;--line:#dce7e0;--ink:#17352b;--muted:#647c70;--accent:#207b56;--reading-size:18px;--reading-leading:1.8;--reading-font:"Segoe UI",system-ui,sans-serif}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--bg)}button,input,textarea,select{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default;opacity:.55}a{color:var(--accent);text-decoration:none}button{border:1px solid var(--line);background:var(--surface);border-radius:12px;padding:10px 14px;color:inherit;font-weight:650}button:hover,a:hover{filter:brightness(.96)}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #87c8a9;outline-offset:3px}header{position:sticky;top:0;z-index:20;background:var(--soft);border-bottom:1px solid var(--line);min-height:78px;padding:14px max(18px,calc((100vw - 1150px)/2));display:flex;align-items:center;justify-content:space-between;gap:12px;padding-top:max(14px,env(safe-area-inset-top))}.brand{display:flex;align-items:center;gap:12px;min-width:0}.brand-icon{display:grid;place-items:center;background:var(--accent);color:#fff;border-radius:16px;font-size:29px;font-weight:700;width:44px;height:48px;flex-shrink:0}.brand small{display:block;font-size:10px;letter-spacing:.2em;color:var(--accent);font-weight:800;margin-bottom:4px}.brand strong{display:block;font-size:16px;max-width:65vw;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.head-actions{display:flex;gap:7px}.head-actions button{padding:8px 10px;border-color:transparent;background:#ffffff80}main{max-width:1150px;margin:0 auto;padding:30px 24px 115px}.eyebrow{font-size:11px;letter-spacing:.17em;font-weight:800;color:var(--accent)}h1{font-size:clamp(28px,4vw,42px);line-height:1.18;letter-spacing:-.035em;margin:12px 0 14px;font-weight:800}h2{font-size:23px;letter-spacing:-.02em}h3{line-height:1.4;font-size:18px;margin:10px 0}p{line-height:1.65}.muted,small{color:var(--muted)}.library-intro{max-width:650px;margin-bottom:28px}.search{display:flex;align-items:center;border:1px solid var(--line);background:var(--surface);border-radius:16px;padding:0 15px;margin-top:22px}.search span{font-size:27px;color:var(--muted)}.search input{border:0;background:none;padding:16px 12px;width:100%;outline:0;color:inherit}.folder-grid{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:10px;margin:20px 0 32px}.folder{padding:16px 12px;text-align:left;display:flex;flex-direction:column;gap:9px;min-height:135px;border-radius:18px;align-items:flex-start}.folder-icon{background:var(--soft);width:34px;height:34px;border-radius:10px;display:grid;place-items:center;font-size:21px;color:var(--accent)}.folder strong{font-size:12px}.folder small{font-size:10px;font-weight:400}.folder.active{background:var(--soft);border-color:var(--accent)}.folder.active .folder-icon{background:var(--accent);color:#fff}.section-title{display:flex;align-items:center;gap:16px;margin:20px 0}.section-title h2{margin:0}.section-title>span{margin-left:auto;color:var(--muted);font-size:13px}.topic-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.topic-card{border:1px solid var(--line);border-radius:20px;background:var(--surface);padding:22px;display:flex;flex-direction:column;min-width:0}.topic-card>small{text-transform:uppercase;letter-spacing:.07em;font-size:9px}.topic-card>p{font-size:13px;color:var(--muted);margin:0 0 22px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.topic-actions{margin-top:auto;display:flex;justify-content:space-between;gap:8px;align-items:center;font-size:12px}.count-button{background:var(--soft);color:var(--accent);font-size:11px;border:0;padding:8px}.notes-link{font-weight:750}.count-row{display:flex;gap:6px;border-top:1px solid var(--line);margin-top:16px;padding-top:13px}.count-row button{font-size:10px;padding:6px 8px;background:transparent;border:0;border-radius:6px}.bottom-nav{position:fixed;bottom:0;left:50%;transform:translate(-50%);width:min(650px,100%);border:1px solid var(--line);border-bottom:0;border-radius:22px 22px 0 0;background:var(--surface);z-index:30;display:flex;justify-content:space-around;padding:10px 8px max(12px,env(safe-area-inset-bottom));box-shadow:0 -8px 40px #133b2310}.bottom-nav a,.bottom-nav button{border:0;border-radius:12px;display:flex;flex-direction:column;align-items:center;gap:3px;padding:8px 22px;color:var(--muted);font-size:20px;background:transparent}.bottom-nav span{font-size:10px;font-weight:650}.bottom-nav .selected{background:var(--soft);color:var(--accent)}dialog{background:var(--surface);color:var(--ink);border:1px solid var(--line);border-radius:24px;width:min(560px,calc(100vw - 24px));max-height:85dvh;padding:28px;box-shadow:0 20px 70px #0002}dialog::backdrop{background:#17352b66;backdrop-filter:blur(4px)}.dialog-close{position:absolute;top:10px;right:10px;border:0;background:transparent;font-size:23px}.primary{display:inline-block;background:var(--accent);color:#fff;border:0;border-radius:13px;padding:14px 20px;text-align:center;font-weight:750}.secondary{display:block;background:var(--soft);border:0;padding:14px 20px;width:100%;margin-top:10px}.stack{display:flex;flex-direction:column;gap:10px}.stack .secondary{margin:0}label{display:block;font-size:13px;font-weight:700;margin:18px 0}input:not([type=range]),select,textarea{display:block;width:100%;border:1px solid var(--line);background:var(--bg);color:var(--ink);border-radius:10px;padding:12px;margin:8px 0}input[type=range]{width:100%;accent-color:var(--accent)}label output{float:right}.info-card{background:var(--soft);border-radius:14px;padding:18px;margin:16px 0}.info-card p{font-size:13px}.outside,.welcome{max-width:620px;margin:10vh auto;padding:32px;text-align:center}.outside .brand-icon{margin:auto}.outside small,.welcome small{display:block;font-size:12px;margin-top:22px}.outside p,.welcome p{color:var(--muted)}.big-icon{font-size:80px;color:var(--accent)}.opening{padding:30vh 20px;text-align:center;font-size:26px;font-weight:800}.opening small{font-size:14px;font-weight:400}#toast{position:fixed;bottom:105px;left:50%;transform:translate(-50%);background:#183e2f;color:#fff;border-radius:12px;padding:12px 20px;z-index:100;max-width:90vw;box-shadow:0 8px 30px #0002;opacity:0;pointer-events:none;transition:opacity .15s;font-size:13px}#toast.show{opacity:1}.reader-toolbar,.quiz-toolbar{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-bottom:20px}.reader-toolbar button{font-size:12px}.reader{max-width:830px;margin:0 auto;background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:34px;font:var(--reading-size)/var(--reading-leading) var(--reading-font)}.reader .lesson-block{margin-bottom:18px;scroll-margin-top:100px;content-visibility:auto;contain-intrinsic-size:auto 80px}.reader h1{font-size:1.8em}.reader h2{border-top:1px solid var(--line);padding-top:22px;font-size:1.5em}.reader h3{font-size:1.2em}.reader h4{font-size:1.05em}.reader p{line-height:inherit}.reader strong{font-weight:800}.reader table{border-collapse:collapse;max-width:100%;display:block;overflow:auto;font-size:.9em}.reader th,.reader td{border:1px solid var(--line);padding:10px;text-align:left;min-width:95px}.reader th{background:var(--soft)}.reader blockquote{border-left:3px solid var(--accent);padding:8px 18px;background:var(--soft);margin:14px 0}.reader img,.reader svg,.reader canvas{max-width:100%;height:auto}.reader figure{margin:12px 0}.reader figcaption{font-size:.8em;color:var(--muted)}.reader pre,.source-editor{font:12px/1.6 Consolas,monospace;white-space:pre-wrap;overflow-wrap:anywhere}.reader pre{background:var(--bg);padding:14px;border-radius:10px}.reader .node-note,.reader .node-example{border-left:3px solid var(--accent);background:var(--soft);padding:16px;border-radius:0 12px 12px 0}.callout-label{font-size:.8em;color:var(--accent);font-weight:800;text-transform:uppercase;letter-spacing:.07em}.callout-warning,.callout-important{border-left-width:5px!important}.figure-title{font-size:.85em;font-weight:750;margin:10px 0}.chart-frame{position:relative;height:280px}.graph-legend{display:flex;gap:8px;flex-wrap:wrap}.graph-legend button{font-size:11px}.graph-legend span{display:inline-block;width:10px;height:3px;margin-right:5px}.graph-readout{font-size:12px}.function-graph text{font-size:10px;fill:var(--muted)}.contents-list{display:flex;flex-direction:column;gap:6px}.contents-list button{text-align:left;font-size:13px}.load-more{font-size:12px;color:var(--muted);text-align:center;padding:20px}.katex-display{overflow-x:auto;overflow-y:hidden;padding:5px 0}.katex{font-size:1.1em}.math-error,.render-failure{color:#a83c32}.quiz-toolbar select{width:auto;margin:0 0 0 auto}.quiz-toolbar,.quiz-toolbar button{font-size:12px}.quiz-sheet{max-width:850px;margin:auto;border:1px solid var(--line);border-radius:22px;padding:28px;background:var(--surface);overflow-anchor:none}.question-text{font-size:var(--reading-size);font-weight:750;line-height:1.65;min-height:90px}.question-text p{margin:0 0 16px}.quiz-sheet #diagram svg{max-width:100%;max-height:260px;height:auto}.options{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:20px 0}.options>button{display:flex;gap:12px;text-align:left;align-items:center;min-height:60px;padding:13px 16px;font-size:16px}.options b{background:var(--soft);border-radius:8px;padding:7px 10px;font-size:12px}.options p{margin:0}.options button:disabled{opacity:1}.options .correct{border-color:#258858;background:#edf8f0}.options .wrong{border-color:#c76b62;background:#fff0ed}.feedback-slot{height:clamp(185px,29dvh,320px);overflow-y:auto;overscroll-behavior:contain;border-top:1px solid var(--line);padding-top:16px;scrollbar-gutter:stable;overflow-anchor:none;font-size:15px;line-height:1.7}.feedback-placeholder{color:var(--muted);font-size:13px;padding:35px 8px;text-align:center}.feedback strong{display:block;font-size:13px}.feedback.correct>strong{color:#258858}.feedback.incorrect>strong{color:#a14b41}.quiz-navigation{display:flex;align-items:center;justify-content:space-between;gap:8px;max-width:850px;margin:18px auto}.quiz-navigation span{font-size:11px;color:var(--muted);text-align:center}.quiz-navigation button{font-size:13px}.admin-tabs{display:flex;gap:8px;overflow-x:auto;padding-bottom:15px}.admin-tabs button{white-space:nowrap;font-size:12px}.admin-tabs .selected{background:var(--accent);color:#fff}.order-row{display:flex;align-items:center;gap:8px;padding:10px 0;border-bottom:1px solid var(--line)}.order-row strong{flex:1;font-size:13px}.order-row>span{font-size:11px;color:var(--muted);min-width:20px}.order-row button{font-size:12px;padding:7px 10px}.source-editor{min-height:330px;width:100%;font-family:Consolas,monospace;resize:vertical}.student{display:flex;justify-content:space-between;gap:15px;border:1px solid var(--line);padding:18px;border-radius:14px;margin-bottom:12px;background:var(--surface);overflow-wrap:anywhere}.student h3{margin:0}.student p{font-size:13px;margin:7px 0}.student small{font-size:11px}.student-actions{display:flex;gap:5px;flex-wrap:wrap;align-items:center}.student-actions button{font-size:11px}#save-order{margin-top:20px}pre{white-space:pre-wrap;word-break:break-word}html[data-theme=paper]{--bg:#f6f1e7;--surface:#fffdf8;--soft:#eee6d5;--line:#e1d8c5;--ink:#383327;--muted:#80755f;--accent:#716039}html[data-theme=dark]{--bg:#141e1a;--surface:#1d2b24;--soft:#293f32;--line:#354d40;--ink:#e2ede6;--muted:#a1b6a9;--accent:#5caf83}html[data-theme=dark] .options .correct{background:#254732}html[data-theme=dark] .options .wrong{background:#4b302e}@media(max-width:1000px){.folder-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:600px){header{padding-left:15px;padding-right:15px;min-height:72px}.brand strong{max-width:48vw;font-size:13px}.brand-icon{width:36px;height:40px;border-radius:12px;font-size:23px}.head-actions{gap:3px}.head-actions button{padding:7px}main{padding:22px 15px 110px}.library-intro h1{font-size:31px}.folder-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.folder{min-height:117px;padding:12px 10px;border-radius:15px}.folder strong{font-size:11px}.folder small{font-size:9px}.topic-grid{grid-template-columns:1fr}.topic-card{padding:20px}.bottom-nav a,.bottom-nav button{padding:7px 18px}.reader{padding:20px 17px;border-radius:15px}.reader-toolbar{gap:6px}.reader-toolbar button{font-size:10px;padding:9px}.quiz-sheet{padding:19px 15px}.question-text{font-size:18px;min-height:85px}.options{gap:8px;grid-template-columns:1fr}.options>button{min-height:49px;padding:9px 12px;font-size:15px}.options b{padding:5px 9px}.options{margin:13px 0}.feedback-slot{height:190px;font-size:14px}.quiz-toolbar{gap:5px}.quiz-toolbar select,.quiz-toolbar button{font-size:11px;padding:8px}.student{flex-direction:column}.order-row{gap:5px}.order-row button{padding:7px}.order-row strong{font-size:12px}.outside{margin-top:7vh}.reader .lesson-block{contain-intrinsic-size:auto 140px}}@media print{html,body{display:none!important}}body[hidden],[hidden]{display:none!important}header{min-height:64px;padding-top:max(9px,env(safe-area-inset-top));padding-bottom:9px;padding-left:20px;padding-right:20px;gap:8px}.brand{gap:10px}.brand strong{font-size:16px;max-width:calc(100vw - 165px)}.brand small{margin:5px 0 0;font-size:10px;letter-spacing:0;text-transform:none;font-weight:500;color:var(--muted)}.brand-icon{width:34px;height:38px;font-size:23px;border-radius:10px}main{max-width:none;padding:16px 24px 90px}.screen-heading{display:flex;justify-content:space-between;align-items:center;gap:15px;margin:0 0 16px}.screen-heading h1{font-size:23px;margin:0;letter-spacing:-.02em}.screen-heading>span{font-size:12px;color:var(--muted);white-space:nowrap}.chapter-list{display:flex;flex-direction:column;gap:7px}.folder{min-height:65px;width:100%;display:flex;flex-direction:row;align-items:center;gap:14px;padding:12px 16px;border-radius:12px}.folder-copy{flex:1;text-align:left;display:flex;flex-direction:column;gap:6px}.folder strong{font-size:14px}.folder small{font-size:11px}.folder-icon{width:33px;height:35px;font-size:20px;flex-shrink:0}.row-arrow{font-size:23px;color:var(--muted);font-weight:400}body[data-view=chapters] main{max-width:1100px;margin:auto}.bottom-nav{padding:5px 8px max(6px,env(safe-area-inset-bottom));border-radius:14px 14px 0 0;box-shadow:none}.bottom-nav a,.bottom-nav button{font-size:17px;padding:6px 22px}.workspace{display:grid;grid-template-columns:245px minmax(0,1fr);gap:22px;max-width:none;align-items:start}.chapter-sidebar,.topic-sidebar{position:sticky;top:82px;max-height:calc(100dvh - 170px);overflow:auto;overscroll-behavior:contain;scrollbar-width:thin;padding-right:8px}.chapter-sidebar .folder{padding:10px;min-height:61px;gap:9px}.chapter-sidebar .folder strong{font-size:12px}.chapter-sidebar .folder small{font-size:10px}.chapter-sidebar .folder-icon{width:28px;height:30px}.all-chapters{display:block;font-size:12px;font-weight:650;margin:0 0 15px}.topic-list{display:flex;flex-direction:column;gap:0;border:1px solid var(--line);border-radius:13px;background:var(--surface);overflow:hidden}.topic-row.topic-card{border:0;border-bottom:1px solid var(--line);border-radius:0;padding:16px;display:flex;flex-direction:row;gap:15px;min-width:0;background:transparent}.topic-row:last-child{border-bottom:0}.topic-number{color:var(--muted);font-size:12px;min-width:22px;padding-top:4px;font-variant-numeric:tabular-nums}.topic-row-content{min-width:0;flex:1}.topic-row h3{font-size:16px;margin:0 0 12px}.topic-row-actions{display:flex;align-items:center;justify-content:space-between;gap:15px;font-size:12px}.topic-row-actions>a{white-space:nowrap;font-weight:700}.question-chips{display:flex;gap:5px;overflow:auto;scrollbar-width:none;min-width:0}.question-chips button{font-size:11px;padding:7px 10px;border:0;background:var(--soft);white-space:nowrap;border-radius:7px}.topic-search{margin:0 0 15px!important;background:var(--surface)!important}.reading-workspace{grid-template-columns:240px minmax(0,1fr);gap:24px}.reading-panel{min-width:0}.reader{max-width:none;width:100%;border:0;border-radius:0;padding:12px 24px;background:var(--surface)}body[data-view=reader]{background:var(--surface)}body[data-view=reader] main{padding-top:8px}.reader-toolbar{position:sticky;top:64px;z-index:10;background:var(--surface);padding:7px 0;border-bottom:1px solid var(--line);margin:0 0 8px;gap:7px}.reader-toolbar button{padding:8px 12px;font-size:11px}.reader-toolbar #notes-fullscreen{margin-left:auto;font-size:22px;padding:3px 10px}.sidebar-title{font-size:12px;font-weight:750;margin:10px 0}.sidebar-topic{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:11px 9px;border-bottom:1px solid var(--line);font-size:12px;color:var(--ink);line-height:1.5}.sidebar-topic small{white-space:nowrap;font-size:10px}.sidebar-topic.active{background:var(--soft);border-radius:8px;color:var(--accent);font-weight:700}.focus-exit{display:none}.fullscreen-notes header,.fullscreen-notes .bottom-nav,.fullscreen-notes .topic-sidebar,.fullscreen-notes .reader-toolbar{display:none!important}.fullscreen-notes main{padding:0!important;max-width:none!important}.fullscreen-notes .workspace{display:block!important}.fullscreen-notes .reader{padding:18px 30px 50px;max-width:none}.fullscreen-notes .focus-exit{display:block;position:fixed;right:10px;top:max(10px,env(safe-area-inset-top));z-index:50;border-radius:50%;padding:8px 12px;font-size:20px;background:var(--surface);opacity:.75}.icon-button{border:0;background:transparent;padding:7px}.text-button{border:0;background:transparent;font-size:12px;color:var(--accent);padding:9px 0}.paywall{width:min(560px,100%);margin:8vh auto}.paywall h1{font-size:28px}.paywall .primary,.paywall .secondary{display:block;width:100%;margin-top:14px}.payment-heading{display:flex;align-items:center;justify-content:space-between}.payment-heading h2{margin:5px 0 15px;font-size:31px}.payment-heading .eyebrow{font-size:9px;margin:0}.payment-badge{font-size:11px;padding:8px;border-radius:8px;background:var(--soft)}.payment-methods{display:flex;gap:6px}.payment-methods button{flex:1;font-size:12px;padding:11px 8px}.payment-methods .selected{background:var(--soft);border-color:var(--accent)}.payment-qr{display:flex;justify-content:center;margin:15px 0 8px}.payment-qr img{display:block;width:min(230px,65vw);height:auto;background:#fff;border:1px solid #ddd;border-radius:10px}.payment-details{text-align:center}.payment-details strong{display:block;font-size:16px}.payment-details small{display:block;margin-top:7px;font-size:10px}.payment-buttons{display:flex;justify-content:center;gap:10px;margin:12px 0}.payment-buttons button{font-size:11px}.payment-hint{font-size:11px;color:var(--muted);margin:8px 0}.utr-input-row{display:flex;align-items:center;gap:8px}.utr-input-row input{min-width:0;margin:4px 0 12px}.utr-input-row button{font-size:12px}.payment-status{padding:10px 0;font-size:12px;line-height:1.5}.payment-status[data-status=paid]{color:#238051}.payment-status[data-status=review]{color:#a56b20}#utr-form label{margin:12px 0 4px;font-size:12px}#utr-form .primary{width:100%;font-size:13px}.pairing-secret{font:11px/1.6 Consolas,monospace;overflow-wrap:anywhere;user-select:all;white-space:pre-wrap;background:var(--soft);padding:12px;border-radius:8px}.receipt-item{padding:12px;border-bottom:1px solid var(--line);font-size:12px}.receipt-item pre{font-size:11px;color:var(--muted)}.payment-device{border:1px solid var(--line);border-radius:10px;padding:12px;margin:10px 0;font-size:12px}body[data-view=quiz] .bottom-nav{display:none}body[data-view=quiz] main{padding:0 18px 10px}body[data-view=quiz] header{min-height:56px}body[data-view=quiz] .brand small{font-size:9px}#quiz-root{max-width:none;margin:auto}.quiz-toolbar{margin:0;padding:8px 0;gap:8px}.quiz-toolbar select{font-size:11px;padding:7px;margin:0 0 0 auto}.quiz-toolbar button{font-size:11px;padding:7px}.question-strip{display:flex;gap:6px;overflow-x:auto;overscroll-behavior-x:contain;scrollbar-width:thin;padding:2px 0 9px;scroll-snap-type:x proximity}.question-strip button{min-width:32px;height:31px;padding:4px;border-radius:7px;font-size:11px;flex-shrink:0;scroll-snap-align:center}.question-strip button.current{border:2px solid var(--accent);font-weight:800}.question-strip button.done-correct{background:#e0f2e4;color:#22613b}.question-strip button.done-wrong{background:#f9e4df;color:#933a32}.quiz-sheet{max-width:none;border-radius:0;border:0;padding:12px 6px 0;background:transparent}.quiz-sheet>.eyebrow{font-size:9px;margin:2px 0 9px}.question-text{min-height:0;font-size:var(--reading-size);line-height:1.65}.question-text p{margin:0 0 12px}.quiz-sheet #diagram svg{max-height:300px;display:block;margin:auto}.options{margin:16px 0;gap:8px;grid-template-columns:1fr 1fr}.options>button{min-height:53px;font-size:16px;padding:10px 13px}.feedback-slot{height:clamp(190px,31dvh,430px);font-size:16px;padding-top:13px}.feedback-placeholder{padding:25px 6px}.quiz-navigation{max-width:none;margin:10px 0 0;padding:6px 0}.quiz-navigation button{font-size:12px;padding:11px 15px}.quiz-navigation span{font-size:11px}body[data-view=admin] main{max-width:1250px;margin:auto}.admin-intro h1{font-size:26px}.admin-intro .eyebrow{display:none}@media(min-width:1600px){.workspace,.reading-workspace{grid-template-columns:270px minmax(0,1fr)}body[data-view=quiz] main{padding-left:4vw;padding-right:4vw}.reader{padding-left:35px;padding-right:35px}}@media(max-width:850px){.workspace{grid-template-columns:minmax(0,1fr)}.chapter-sidebar,.topic-sidebar{display:none}.reading-workspace{display:block}.screen-heading{align-items:flex-start}.screen-heading>span{font-size:11px}.screen-heading h1{font-size:20px}.topic-row-actions{align-items:flex-start;gap:10px}.reader{padding:12px 8px}.reader-toolbar{top:64px}.reader-toolbar button{padding:7px 9px}}@media(max-width:600px){header{padding-left:12px;padding-right:12px;min-height:63px}.brand{gap:7px}.brand strong{font-size:13px;max-width:calc(100vw - 135px)}.brand small{font-size:8px;letter-spacing:0}.brand-icon{width:29px;height:34px;font-size:22px}.head-actions button{font-size:13px;padding:6px 8px}main{padding:14px 12px 83px}.screen-heading{margin-bottom:12px;gap:8px}.screen-heading h1{font-size:19px}.screen-heading>span{max-width:42%;white-space:normal;text-align:right;font-size:10px}.folder{min-height:62px;padding:11px 13px}.folder strong{font-size:13px}.folder small{font-size:10px}.chapter-list{gap:6px}.topic-row.topic-card{padding:14px 11px;gap:8px}.topic-number{font-size:10px;min-width:18px}.topic-row h3{font-size:15px;margin-bottom:10px}.topic-row-actions{display:block}.notes-link{display:inline-block;font-size:11px;margin-bottom:10px}.question-chips{max-width:100%;gap:5px}.question-chips button{padding:6px 8px;font-size:10px}.bottom-nav a,.bottom-nav button{padding:6px 18px}.reader-toolbar{top:63px;gap:5px}.reader-toolbar button{font-size:10px;padding:7px 8px}.reader-toolbar #notes-fullscreen{font-size:21px;padding:1px 7px}.reader{padding:10px 4px}.fullscreen-notes .reader{padding:12px 13px 35px}.fullscreen-notes .reader .lesson-block{scroll-margin-top:12px}body[data-view=quiz] main{padding:0 11px 10px}.quiz-toolbar{padding:7px 0}.quiz-toolbar #counter{font-size:11px}.quiz-toolbar button{font-size:10px}.quiz-toolbar select{font-size:10px;padding:6px}.quiz-sheet{padding:10px 1px 0}.question-text{font-size:18px;line-height:1.62}.options{grid-template-columns:1fr;margin:13px 0}.options>button{min-height:47px;font-size:16px;padding:9px 11px}.options b{font-size:11px;padding:5px 8px}.feedback-slot{height:clamp(180px,27dvh,290px);font-size:15px}.quiz-sheet #diagram svg{max-height:240px}.quiz-navigation{gap:5px;margin-top:6px}.quiz-navigation button{font-size:11px;padding:10px 12px}.quiz-navigation span{font-size:10px}.question-strip{padding-bottom:8px}.topic-search{font-size:13px}.source-editor{min-height:260px}dialog{padding:23px 20px}.payment-qr img{width:min(210px,61vw)}}.checkbox-label{display:flex;align-items:flex-start;gap:10px;line-height:1.6}.checkbox-label input[type=checkbox]{width:18px;min-width:18px;display:inline-block;margin:3px 0;accent-color:var(--accent)}:root{--app-header-height:66px;--app-safe-top:0px;--app-safe-bottom:0px;--dock-height:78px;--glass-fill:rgba(247,253,249,.78);--glass-edge:rgba(255,255,255,.85)}header{position:fixed!important;inset:var(--app-safe-top) 0 auto 0;z-index:70;min-height:66px;background:#edf7f1e8;backdrop-filter:blur(18px) saturate(155%);-webkit-backdrop-filter:blur(18px) saturate(155%);box-shadow:0 1px #1f593c12;padding-top:10px;padding-bottom:10px}.brand .brand-icon{background:linear-gradient(145deg,#1d835a,#125138);box-shadow:0 4px 12px #16573720}.brand strong{font-weight:780;max-width:calc(100vw - 205px)}.head-actions{align-items:center;gap:6px}.head-buy{display:flex;align-items:center;gap:4px;border:1px solid #c3dbc9;border-radius:20px;padding:7px 9px;font-size:11px;font-weight:800;white-space:nowrap;background:#ffffffb3;color:var(--accent)}.head-buy svg{width:16px;height:16px}.head-actions button svg{width:20px;height:20px;display:block}body:not(.fullscreen-notes) main{padding-top:calc(var(--app-header-height) + var(--app-safe-top) + 17px)!important;padding-bottom:calc(var(--dock-height) + var(--app-safe-bottom) + 24px)!important}.reader-toolbar{top:calc(var(--app-header-height) + var(--app-safe-top))!important}.chapter-sidebar,.topic-sidebar{top:calc(var(--app-header-height) + var(--app-safe-top) + 18px);max-height:calc(100dvh - var(--app-header-height) - var(--dock-height) - 55px)}.bottom-nav.liquid-dock,.test-dock{position:fixed;left:50%;bottom:calc(10px + max(env(safe-area-inset-bottom),var(--app-safe-bottom)));transform:translate(-50%);width:min(590px,calc(100% - 24px));z-index:65;border:1px solid var(--glass-edge);border-radius:27px;padding:7px 9px;display:flex;align-items:center;justify-content:space-around;background:linear-gradient(135deg,#ffffff6e,#ffffff14),var(--glass-fill);box-shadow:0 12px 36px #123c2524,inset 0 1px #fff8;backdrop-filter:blur(24px) saturate(180%);-webkit-backdrop-filter:blur(24px) saturate(180%);isolation:isolate}.liquid-dock:before,.test-dock:before{content:"";position:absolute;top:0;left:12%;right:12%;height:1px;background:linear-gradient(90deg,transparent,#fff,transparent);pointer-events:none}.liquid-dock .dock-item,.test-dock .dock-item{border:0;background:none;display:flex;align-items:center;justify-content:center;gap:6px;min-width:45px;min-height:47px;padding:8px 13px;color:var(--muted);border-radius:20px;transition:background .24s,color .24s,transform .24s;position:relative;font-size:11px;flex-direction:row;text-decoration:none}.dock-icon{display:grid;place-items:center;line-height:1}.dock-icon svg{width:23px;height:23px;display:block;transition:transform .25s}.liquid-dock .dock-label,.test-dock .dock-label{display:none;font-size:11px;font-weight:800;white-space:nowrap}.liquid-dock .is-active,.test-dock .is-active{background:#1f7f541f;color:var(--accent)}.liquid-dock .is-active .dock-label,.test-dock .is-active .dock-label{display:inline}.is-active .dock-icon svg{animation:dock-icon-arrive .48s cubic-bezier(.2,.8,.2,1)}.dock-item:active{transform:scale(.93)}.dock-item:hover .dock-icon svg{transform:translateY(-2px)}@keyframes dock-icon-arrive{0%{transform:translateY(5px) scale(.8)}65%{transform:translateY(-3px) scale(1.08)}to{transform:none}}.purchase-banner{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:15px 17px;background:linear-gradient(115deg,#153e2e,#286c4b);color:#f3fff7;border-radius:17px;margin:0 0 17px;box-shadow:0 8px 23px #1c4f2f15}.purchase-banner .purchase-icon{display:flex;align-items:center;gap:12px;min-width:0}.purchase-banner svg{width:27px;height:27px;color:#cfedb7;flex-shrink:0}.purchase-banner strong{display:block;font-size:14px;line-height:1.5}.purchase-banner small{display:block;font-size:10px;color:#cbdfd1;margin-top:3px}.purchase-banner a{color:#193f2d;background:#edf8ec;border-radius:11px;padding:11px 15px;font-weight:800;font-size:12px;white-space:nowrap}.purchase-screen{max-width:840px;margin:8px auto 0}.plan-card{position:relative;overflow:hidden;background:var(--surface);border:1px solid var(--line);border-radius:28px;padding:32px;box-shadow:0 15px 60px #17422b0a}.plan-card:before{content:"";position:absolute;width:220px;height:220px;right:-110px;top:-120px;border-radius:50%;background:radial-gradient(circle,#c7ead3,transparent 70%);pointer-events:none}.plan-card .plan-tag{display:inline-flex;gap:7px;align-items:center;font-size:11px;font-weight:800;color:var(--accent);background:var(--soft);padding:8px 12px;border-radius:30px}.plan-tag svg{width:17px;height:17px}.plan-card h1{font-size:35px;margin:20px 0 10px}.plan-price{display:flex;gap:10px;align-items:baseline;margin:25px 0}.plan-price strong{font-size:57px;letter-spacing:-.06em;line-height:1}.plan-price span{font-size:13px;color:var(--muted)}.plan-features{display:grid;grid-template-columns:1fr 1fr;gap:14px;list-style:none;padding:0;margin:25px 0}.plan-features li{display:flex;align-items:center;gap:9px;font-size:13px;line-height:1.5}.plan-features svg{width:19px;height:19px;flex-shrink:0;color:var(--accent)}.plan-actions{display:flex;gap:10px;margin-top:25px;flex-wrap:wrap}.plan-actions .primary{flex:1}.plan-actions .secondary{flex:1;margin:0;width:auto}.plan-footnote{font-size:11px;color:var(--muted);margin-top:18px}.plan-status{font-size:12px;padding:13px 15px;border:1px solid var(--line);background:var(--soft);border-radius:12px;margin-top:20px}.topic-row-actions .notes-link{display:inline-flex;align-items:center;gap:10px;min-height:49px;min-width:128px;border-radius:13px;padding:10px 15px;background:var(--accent);color:#fff;font-size:13px;font-weight:800;margin:0;box-shadow:0 4px 12px #1973491c}.notes-link .read-arrow{display:grid;place-items:center;width:31px;height:31px;border:1px solid #ffffff50;background:#ffffff1a;border-radius:10px;transition:transform .2s}.read-arrow svg{width:25px;height:25px}.notes-link:hover .read-arrow{transform:translate(2px,-2px)}.topic-row h3{font-size:17px}.topic-row-content .topic-row-actions{align-items:center;gap:15px}.question-chips{padding:3px 0}body[data-view=quiz]{--dock-height:139px}body[data-view=quiz] main{padding-bottom:calc(var(--dock-height) + var(--app-safe-bottom) + 30px)!important}body[data-view=quiz] .test-dock{display:block;width:min(760px,calc(100% - 24px));padding:9px 10px 6px}.dock-quiz-tools{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:10px;padding:0 3px 8px;border-bottom:1px solid rgba(78,119,89,.14)}.dock-quiz-tools .question-strip{min-width:0;display:flex;margin:0;padding:0;align-items:center;scrollbar-width:none;scroll-padding-inline:4px;gap:5px;min-height:36px}.dock-quiz-tools .question-strip button{height:33px;min-width:33px;border:1px solid rgba(91,130,104,.19);background:#ffffff73;border-radius:10px;font-size:10px;padding:4px}.dock-quiz-tools .question-strip .current{border:1.5px solid var(--accent);background:#1f7f541f}.dock-quiz-tools .question-strip .done-correct{background:#d4ecd9;color:#276541}.dock-quiz-tools .question-strip .done-wrong{background:#f5ded8;color:#944739}.dock-language{display:flex;align-items:center;justify-content:center;gap:3px;min-width:0;background:#1f7f540f;border-radius:13px;padding:3px}.dock-language button{min-height:31px;flex:1;border:0;background:transparent;padding:5px 7px;border-radius:10px;font-size:11px;color:var(--muted);white-space:nowrap}.dock-language button[aria-pressed=true]{background:var(--surface);box-shadow:0 2px 8px #173d2712;color:var(--accent)}.test-dock-actions{display:flex;align-items:center;justify-content:space-around;padding-top:5px}.test-dock .dock-item{min-height:44px;padding:7px 10px}.test-dock .dock-icon svg{width:22px;height:22px}.quiz-toolbar{position:sticky;top:calc(var(--app-header-height) + var(--app-safe-top));z-index:40;min-height:38px;justify-content:space-between;background:var(--bg);padding:10px 3px;margin:0;border-bottom:1px solid var(--line)}#quiz-summary{font-size:10px;color:var(--muted)}.quiz-sheet{padding-top:14px}.quiz-sheet>#kind{font-size:9px}.quiz-navigation{padding-bottom:4px;font-size:11px}.result-score{font-size:54px;font-weight:850;letter-spacing:-.06em;color:var(--accent);margin:18px 0 8px}.result-score small{font-size:23px;color:var(--muted);font-weight:600}.result-stats{display:flex;gap:10px;margin:15px 0}.result-stats>div{background:var(--soft);border-radius:13px;padding:13px;flex:1;text-align:center}.result-stats strong{display:block;font-size:21px}.result-stats small{font-size:10px}.finish-note{font-size:12px;color:var(--muted)}.fullscreen-notes .test-dock,.fullscreen-notes .bottom-nav{display:none!important}.fullscreen-notes main{padding:0!important}.fullscreen-notes .reader-toolbar{display:none}.fullscreen-notes .reader .lesson-block{scroll-margin-top:14px}html[data-theme=dark]{--glass-fill:rgba(24,42,32,.84);--glass-edge:rgba(154,193,166,.23)}html[data-theme=dark] header{background:#192b21f0}html[data-theme=dark] .head-buy{background:#304c3ab3;border-color:#45624d}html[data-theme=dark] .liquid-dock,html[data-theme=dark] .test-dock{background:linear-gradient(130deg,#7ca58812,transparent),var(--glass-fill)}html[data-theme=dark] .dock-quiz-tools .question-strip button{background:#304e395c}html[data-theme=dark] .dock-quiz-tools .question-strip .done-wrong{background:#633d36;color:#f2c0b4}html[data-theme=dark] .dock-quiz-tools .question-strip .done-correct{background:#31593b;color:#c0e6c5}html[data-theme=dark] .plan-card:before{opacity:.15}html[data-theme=paper]{--glass-fill:rgba(251,247,234,.84)}@media(max-width:600px){:root{--app-header-height:64px;--dock-height:79px}header{padding:9px 12px;min-height:64px}.brand strong{font-size:12px;max-width:calc(100vw - 195px)}.brand small{font-size:8px}.head-buy{padding:7px;font-size:10px;gap:3px}.head-buy svg{width:15px;height:15px}.head-actions{gap:3px}.head-actions button{padding:6px}.purchase-banner{padding:12px 13px;gap:8px;border-radius:15px}.purchase-banner strong{font-size:12px}.purchase-banner small{font-size:9px;max-width:205px}.purchase-banner .purchase-icon{gap:9px}.purchase-banner svg{width:23px;height:23px}.purchase-banner a{font-size:10px;padding:10px 11px}.liquid-dock .dock-item{padding:8px 10px;min-width:40px;gap:5px}.liquid-dock .dock-icon svg{width:22px;height:22px}.liquid-dock .dock-label{font-size:10px}.plan-card{padding:24px 20px;border-radius:22px}.plan-card h1{font-size:28px}.plan-price strong{font-size:52px}.plan-features{grid-template-columns:1fr;gap:12px;margin:22px 0}.plan-actions{flex-direction:column}.plan-actions button{width:100%}.topic-row-actions .notes-link{min-height:48px;min-width:137px;padding:9px 12px;font-size:12px;margin-bottom:9px}.topic-row h3{font-size:16px}.topic-row-content .topic-row-actions{display:block}.reader-toolbar{top:calc(var(--app-header-height) + var(--app-safe-top))!important}body[data-view=quiz]{--dock-height:137px}.test-dock .dock-item{padding:7px 9px;gap:5px}.test-dock .dock-label{font-size:10px}.test-dock .dock-icon svg{width:21px;height:21px}.dock-quiz-tools{gap:8px}.dock-language button{font-size:10px;padding:5px}.dock-quiz-tools .question-strip button{height:32px;min-width:31px}.quiz-toolbar{top:calc(var(--app-header-height) + var(--app-safe-top));padding:9px 2px}.quiz-toolbar #counter{font-size:11px}.feedback-slot{height:clamp(180px,27dvh,320px)}.reader .lesson-block{scroll-margin-top:calc(var(--app-header-height) + var(--app-safe-top) + 53px)}}@media(prefers-reduced-motion:reduce){.dock-item,.dock-icon svg,.read-arrow{animation:none!important;transition:none!important}}@supports not(backdrop-filter:blur(2px)){.liquid-dock,.test-dock{background:var(--surface)}}