:root{--ink:#192e37;--muted:#68767c;--teal:#12665f;--green:#def0e7;--paper:#f7f8f4;--line:#e1e6df;--amber:#a96b35;--purple:#7363a2;--white:#fff;--serif:Georgia,'Noto Serif SC','Songti SC',SimSun,serif}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--paper);font-family:'Segoe UI','Microsoft YaHei',sans-serif;font-size:14px;line-height:1.7}button,input,select,textarea{font:inherit}button,a,input,textarea,select{ -webkit-tap-highlight-color:transparent}a{color:var(--teal);text-decoration:none}button{cursor:pointer}button:disabled{cursor:default;opacity:.55}:focus-visible{outline:3px solid #e4a84c;outline-offset:4px}.sidebar{position:fixed;left:0;top:0;bottom:0;width:242px;background:#fff;border-right:1px solid var(--line);padding:30px 22px;display:flex;flex-direction:column;z-index:10}.brand{display:flex;align-items:center;gap:11px;color:var(--ink);font-weight:700;letter-spacing:.3px}.brand-mark{display:grid;place-items:center;width:39px;height:43px;border-radius:12px;background:var(--teal);color:white;font:italic 34px Georgia;position:relative}.brand-mark span{position:absolute;color:#b9d2a7;right:6px;top:3px;font-size:30px}.brand small{display:block;font-size:8px;font-weight:500;letter-spacing:1.6px;color:var(--muted);margin-top:2px}.nav-label{font-size:11px;color:#87918b;letter-spacing:2px;margin:45px 12px 14px}nav{display:grid;gap:8px}nav a{display:flex;align-items:center;gap:13px;padding:11px 13px;color:#637174;border-radius:8px;font-weight:500}nav a.active{background:#eaf3ee;color:var(--teal);font-weight:700}nav a:hover{background:#f1f5f0}nav a span{font-size:20px;width:22px;line-height:1}nav em{margin-left:auto;font-size:10px;font-style:normal;background:#e0ebe2;padding:1px 6px;border-radius:4px}.sidebar-bottom{margin-top:auto;font-size:11px;color:var(--muted)}.plant{border-top:1px solid var(--line);padding-top:22px;font-family:var(--serif);font-size:16px;color:#47645b;line-height:1.8}.sidebar-bottom p{margin:18px 0 10px}.workspace{margin-left:242px}.topbar{height:72px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;padding:0 44px;background:#fafbf7}.top-meta{font-size:11px;color:var(--muted);display:flex;align-items:center;gap:9px}.top-meta i{width:6px;height:6px;background:#66a385;border-radius:50%}.date{margin-left:15px;font-size:9px;letter-spacing:1px}main{max-width:1290px;padding:35px 44px 65px;margin:auto;min-height:80vh}footer{border-top:1px solid var(--line);padding:22px 44px;color:var(--muted);font-size:11px;display:flex;justify-content:space-between;gap:20px}.eyebrow{font-size:10px;letter-spacing:2px;font-weight:700;color:var(--teal);text-transform:uppercase}h1,h2,h3,h4,p{margin-top:0}h1{font-family:var(--serif);font-size:36px;font-weight:600;line-height:1.5;letter-spacing:1px;margin:12px 0 15px}h2{font-size:21px;line-height:1.5}h3{font-size:16px}small,.muted{color:var(--muted)}.hero{display:grid;grid-template-columns:1.3fr 1fr;min-height:300px;padding:36px 38px;border:1px solid #dce5d8;border-radius:14px;background:linear-gradient(110deg,#eef3e9,#f2f4e9);overflow:hidden;position:relative}.hero p{max-width:450px;color:#62746b;font-size:13px;line-height:1.9}.hero-art{display:flex;align-items:center;justify-content:center}.hero-art svg{width:100%;max-width:335px;height:auto}.actions{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.btn{border:1px solid var(--line);padding:10px 17px;border-radius:7px;background:#fff;color:var(--ink);display:inline-flex;gap:12px;align-items:center;font-weight:500;font-size:12px}.btn.primary{background:var(--teal);border-color:var(--teal);color:white}.btn:hover{filter:brightness(.96);transform:translateY(-1px)}.btn.small{padding:6px 11px;font-size:11px}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:23px 0 34px}.stat{background:white;border:1px solid var(--line);border-radius:10px;padding:18px 21px}.stat .value{font-family:Georgia,serif;font-size:29px;line-height:1.1}.stat .value span{font:12px 'Segoe UI',sans-serif;color:var(--muted);margin-left:6px}.stat p{margin:9px 0 0;color:var(--muted);font-size:11px}.section-head{display:flex;justify-content:space-between;align-items:center;gap:20px;margin:28px 0 15px}.section-head h2{margin:0}.section-head a{font-size:12px}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:20px}.card{border:1px solid var(--line);border-radius:12px;background:white;padding:25px}.track-card{position:relative;overflow:hidden}.track-number{font:italic 44px Georgia;color:#d9e8df;position:absolute;right:22px;top:12px}.track-card.purple .track-number{color:#e7e1f2}.tag{display:inline-block;border-radius:4px;padding:3px 7px;font-size:10px;background:#e8f2ed;color:var(--teal);margin-right:5px}.tag.purple{background:#eeebf6;color:var(--purple)}.tag.amber{background:#f6ecdd;color:var(--amber)}.track-card h3{font-size:19px;margin:14px 0 10px}.track-card p{color:var(--muted);font-size:12px;max-width:370px}.track-card .path{font-size:11px;color:#53665e;padding-top:15px;border-top:1px solid var(--line)}.track-card>a{display:block;margin-top:16px;font-size:12px}.next{display:flex;align-items:center;gap:20px;padding:20px 23px;background:#203e40;color:white;border-radius:10px;margin-top:22px}.next p{margin:4px 0 0;color:#bad0c8;font-size:12px}.next .btn{margin-left:auto;white-space:nowrap}.next-icon{font-size:27px;color:#c0d5b1}.page-intro{margin-bottom:25px}.page-intro h1{font-size:31px;margin-bottom:8px}.page-intro p{color:var(--muted);max-width:700px;font-size:13px}.toolbar{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:20px 0}.search{flex:1;min-width:210px;padding:11px 15px;border:1px solid var(--line);border-radius:7px;background:white;color:var(--ink)}.chips{display:flex;gap:6px;flex-wrap:wrap}.chip{border:1px solid var(--line);background:white;color:var(--muted);padding:7px 13px;border-radius:6px;font-size:12px}.chip.active{border-color:var(--teal);background:var(--teal);color:white}select{border:1px solid var(--line);border-radius:6px;padding:10px;background:white;color:var(--ink)}.progress-track{height:6px;border-radius:8px;background:#e8ede6;overflow:hidden}.progress-track>div{height:100%;background:#4d8f77;transition:width .3s}.progress-banner{display:grid;grid-template-columns:1fr 190px;gap:25px;padding:20px;background:white;border:1px solid var(--line);border-radius:10px;margin-bottom:24px}.progress-banner p{margin:0;font-size:12px;color:var(--muted)}.week-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.week{display:flex;gap:17px;background:white;border:1px solid var(--line);border-radius:9px;padding:20px;align-items:start}.week.done{border-color:#9cbeaa;background:#f4faf5}.week-num{font-family:Georgia,serif;color:#9aa99d;font-size:27px;line-height:1.2;min-width:34px}.week h3{font-size:14px;margin:0 0 5px}.week p{font-size:12px;color:var(--muted);margin-bottom:12px}.week-body{flex:1}.check{display:flex;align-items:center;gap:7px;font-size:12px;color:var(--teal);cursor:pointer}.check input{accent-color:var(--teal);width:16px;height:16px}.paper-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:15px}.paper{display:flex;flex-direction:column;min-height:250px;padding:23px}.paper-top{display:flex;align-items:center;justify-content:space-between;font-size:11px}.paper-id{font:italic 19px Georgia;color:#8a9a8d}.paper h3{font-family:Georgia,'Microsoft YaHei',serif;font-size:17px;line-height:1.5;margin:16px 0 10px}.paper p{font-size:12px;color:var(--muted);margin-bottom:20px}.paper-bottom{margin-top:auto;border-top:1px solid var(--line);padding-top:14px;display:flex;justify-content:space-between;align-items:center}.empty{padding:50px;text-align:center;color:var(--muted);grid-column:1/-1;background:white;border:1px dashed var(--line);border-radius:10px}.reader-layout{display:grid;grid-template-columns:225px minmax(0,1fr);gap:24px}.contents{position:sticky;top:20px;align-self:start;display:grid;gap:5px}.contents button{text-align:left;border:0;border-radius:7px;padding:11px;background:none;color:var(--muted);font-size:12px}.contents button.active{background:#e6eee5;color:var(--teal);font-weight:600}.prose{line-height:1.95;overflow-wrap:anywhere;font-size:14px}.prose h3{font-size:22px;line-height:1.6}.prose h4{font-size:17px;margin-top:29px}.prose p{margin:12px 0}.prose ul{padding-left:24px}.prose a{text-decoration:underline;text-underline-offset:3px}.prose pre{white-space:pre-wrap;background:#f3f5ef;padding:18px;border-radius:8px;font-size:12px}.prose code{background:#eef2eb;padding:2px 4px;font-family:Consolas,monospace;font-size:.9em}.table-scroll{overflow:auto}table{border-collapse:collapse;width:100%;font-size:12px;line-height:1.8;margin:15px 0}th,td{padding:12px;border:1px solid var(--line);text-align:left;min-width:100px}th{background:#edf3eb;font-weight:600}.flow{padding:20px;color:var(--teal);background:#eef5ed;border-radius:8px}dialog{width:min(860px,94vw);max-height:90vh;border:1px solid var(--line);border-radius:14px;padding:0;box-shadow:0 25px 90px #00000026}dialog::backdrop{background:#112d3a80;backdrop-filter:blur(4px)}.dialog-top{display:flex;align-items:center;justify-content:space-between;padding:14px 25px;background:#f4f6f0;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:1;color:var(--muted);font-size:12px}.icon-btn{border:0;background:none;font-size:28px;color:var(--ink);line-height:1}#dialog-content{padding:28px 32px}.note-editor{width:100%;min-height:130px;padding:14px;border:1px solid var(--line);border-radius:8px;resize:vertical;background:#fcfdf9;color:var(--ink);line-height:1.8}.note-label{display:block;font-weight:600;font-size:13px;margin:25px 0 8px}.save-hint{font-size:11px;color:var(--muted);display:block;margin-top:6px}.note-card{margin:15px 0}.note-card p{white-space:pre-wrap;font-size:13px}.lab-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.lab-card{padding:27px}.lab-card h2{margin:10px 0;font-size:20px}.lab-card p{font-size:12px;color:var(--muted)}.slider-row{display:flex;align-items:center;gap:15px;margin:20px 0}.slider-row label{min-width:70px;font-size:12px}.slider-row input{width:100%;accent-color:var(--teal)}.slider-row output{min-width:45px;font-family:monospace;color:var(--teal)}.bars{display:grid;gap:12px;margin:25px 0}.bar-row{display:grid;grid-template-columns:45px 1fr 38px;align-items:center;gap:10px;font-size:11px}.bar-wrap{height:13px;background:#edf0e9;border-radius:3px;position:relative}.bar-fill{height:100%;background:#a7bbb1;border-radius:3px;transition:width .15s,background .15s}.bar-fill.selected{background:var(--teal)}.threshold-mark{position:absolute;top:-4px;bottom:-4px;border-left:2px dotted #b56e36;z-index:1}.result-box{padding:15px;border-radius:8px;background:#edf4ec;color:var(--teal);font-size:13px;min-height:60px}.lab-metrics{display:flex;gap:10px;margin:18px 0}.lab-metrics>div{flex:1;padding:15px 8px;background:#f0f4ec;border-radius:8px;text-align:center}.lab-metrics strong{display:block;font:25px Georgia;color:var(--teal)}.lab-metrics small{font-size:10px}.quiz-card{max-width:760px;margin:25px auto;padding:35px}.quiz-count{font-size:11px;letter-spacing:1px;color:var(--teal)}.quiz-question{font-size:22px;line-height:1.7;margin:20px 0}.options{display:grid;gap:12px}.option{display:flex;gap:15px;text-align:left;align-items:center;padding:15px;border:1px solid var(--line);background:white;border-radius:8px;color:var(--ink)}.option span{display:grid;place-items:center;width:28px;height:28px;background:#f1f3ed;border-radius:5px;flex-shrink:0;font:15px Georgia}.option.correct{border-color:#44866b;background:#edf6ef;opacity:1}.option.wrong{border-color:#c27965;background:#fbefeb;opacity:1}.feedback{padding:17px;margin:20px 0;background:#eff4e9;border-radius:8px;font-size:13px}.quiz-score{font:60px Georgia;color:var(--teal);margin:20px 0}.info{border-left:0;padding:10px 16px;color:var(--muted);font-size:12px;margin:25px 0}.skip{position:fixed;top:-60px;left:20px;background:white;padding:10px;z-index:100}.skip:focus{top:10px}#toast{position:fixed;right:25px;bottom:25px;background:var(--ink);color:white;border-radius:8px;padding:11px 18px;opacity:0;pointer-events:none;transition:opacity .2s;z-index:100}#toast.visible{opacity:1}.overview-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.overview-step{border-top:2px solid #d9e3d5;padding-top:15px}.overview-step small{font-size:10px;letter-spacing:1px}.overview-step h3{font-size:13px;margin:6px 0}.overview-step p{font-size:11px;color:var(--muted)}.mode-notice{font-size:11px;color:var(--muted);margin:12px 0}.import-label input{display:none}.reduced{color:var(--amber)}@media(min-width:1500px){main{padding-top:45px}.hero{min-height:335px}}@media(max-width:1100px){.sidebar{width:205px;padding:25px 15px}.workspace{margin-left:205px}main{padding:28px}.topbar{padding:0 28px}.hero{padding:25px}.hero h1{font-size:30px}.reader-layout{grid-template-columns:180px minmax(0,1fr)}.lab-grid{grid-template-columns:1fr}}@media(max-width:760px){.sidebar{position:static;width:100%;padding:16px;display:block}.brand{margin-bottom:15px}.nav-label,.sidebar-bottom{display:none}nav{display:flex;overflow:auto;gap:5px}nav a{white-space:nowrap;padding:8px 10px;font-size:12px}nav a span{display:none}nav em{display:none}.workspace{margin-left:0}.topbar{height:48px;padding:0 20px}.date{display:none}main{padding:22px 18px 40px}.hero{grid-template-columns:1fr;padding:25px}.hero h1{font-size:29px}.hero-art{display:none}.stats{grid-template-columns:repeat(2,1fr);gap:10px}.two-col,.week-grid,.paper-grid{grid-template-columns:1fr}.next{flex-wrap:wrap}.next .btn{margin-left:0}.reader-layout{grid-template-columns:1fr}.contents{position:static;display:flex;overflow:auto}.contents button{white-space:nowrap}.prose.card{padding:20px}.overview-steps{grid-template-columns:repeat(2,1fr)}.progress-banner{grid-template-columns:1fr;gap:12px}.quiz-card{padding:22px}.quiz-question{font-size:18px}footer{padding:20px;display:block}footer span{display:block;margin-top:7px}#dialog-content{padding:22px}.section-head h2{font-size:18px}}@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
/* Expanded reading lessons. */
.lesson-stack{margin:18px 0 24px}.lesson-part{border:1px solid var(--line);border-radius:12px;margin:12px 0;background:#fff;overflow:hidden}.lesson-part summary{cursor:pointer;padding:19px 20px;font-weight:650;font-size:17px;line-height:1.6;list-style-position:inside}.lesson-part summary:focus-visible{outline:3px solid #466a58;outline-offset:-3px}.lesson-part[open] summary{border-bottom:1px solid #e8e7df;background:#f4f6f0}.lesson-number{font-size:12px;letter-spacing:.08em;color:#6a7867;margin-right:13px}.lesson-text{padding:8px 24px 20px;line-height:1.95}.lesson-text p{margin:14px 0}.lesson-text li{margin:12px 0}.lesson-text pre{white-space:pre;overflow-x:auto;max-width:100%;line-height:1.7}.reader-tools{margin:18px 0;flex-wrap:wrap}.source-overview{background:#f8f7f0;margin:24px 0}.lesson-text code{overflow-wrap:anywhere}.lesson-text pre code{overflow-wrap:normal}@media(max-width:600px){.lesson-part summary{padding:15px;font-size:16px}.lesson-text{padding:5px 16px 15px}.reader-tools .btn{font-size:12px}}