:root{--paper:#f5f3eb;--card:#fffefa;--ink:#243b32;--muted:#69736a;--green:#274d3e;--green-light:#e7ece2;--line:#dcded2;--accent:#a97743;--body:#35413a;--radius:18px;--read-size:21px;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,a,input{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer}a{color:inherit}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #a97743;outline-offset:4px}button:disabled{cursor:default;opacity:.45}button{color:inherit}h1,h2,h3,p{margin-top:0}button,a{touch-action:manipulation}a{text-underline-offset:4px}button svg{width:18px;height:18px}svg{vertical-align:middle}button{border:0}button:active{transform:translateY(1px)}.serif{font-family:Georgia,"Times New Roman","Songti SC",SimSun,serif}.skip-link{position:fixed;left:16px;top:-60px;z-index:20;background:var(--ink);color:white;padding:14px}.skip-link:focus{top:12px}.shell{width:min(1136px,calc(100% - 80px));margin:auto}.topbar{height:98px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand-wrap{display:flex;align-items:center;gap:18px}.brand{font-family:Georgia,serif;font-size:35px;letter-spacing:-2px;font-weight:700;text-decoration:none}.brand-dot{color:var(--accent)}.brand-tag{font-size:11px;line-height:1.65;letter-spacing:.5px;border-left:1px solid var(--line);padding-left:17px;color:var(--muted)}.nav{display:flex;gap:6px}.nav button{background:transparent;font-size:13px;padding:12px 18px;border-radius:24px;color:var(--muted)}.nav button.active{background:var(--green-light);color:var(--green);font-weight:600}.eyebrow{display:block;font-size:10px;font-weight:700;letter-spacing:2px;color:var(--accent);line-height:1.6}.hero{display:flex;justify-content:space-between;gap:40px;align-items:center;padding:66px 0 51px}.hero h1{font-size:48px;font-weight:500;line-height:1.4;letter-spacing:-2px;margin:17px 0 17px}.hero p{font-size:14px;color:var(--muted);line-height:1.9;margin-bottom:0}.hero-word{width:284px;position:relative;flex-shrink:0;padding:34px 0 22px 36px;border-left:1px solid var(--line)}.hero-word .big-twenty{font-family:Georgia,serif;font-size:118px;letter-spacing:-8px;line-height:.95;font-weight:400}.hero-word .minute{font-size:14px;margin-left:12px;color:var(--muted)}.hero-word p{font-family:Georgia,serif;font-size:15px;font-style:italic;margin-top:22px;color:var(--muted)}.hero-word:after{content:"";width:92px;height:1px;background:var(--accent);position:absolute;left:36px;bottom:4px}.dashboard{display:grid;grid-template-columns:1fr 300px;gap:20px;margin-bottom:53px}.feature-card{background:var(--green);color:var(--paper);padding:31px 33px;border-radius:var(--radius);position:relative;overflow:hidden;display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:204px}.feature-card:after{content:"";position:absolute;right:-62px;top:-75px;width:260px;height:260px;border:1px solid #ffffff14;border-radius:50%;pointer-events:none}.feature-card .eyebrow{color:#d7c6a8}.feature-card h2{font-size:25px;font-weight:500;margin:14px 0 7px;line-height:1.5}.feature-card p{color:#d4dfd5;font-family:Georgia,serif;font-size:15px;margin-bottom:25px}.feature-card .button{min-width:160px;white-space:nowrap}.button{display:inline-flex;align-items:center;justify-content:center;gap:19px;border-radius:9px;font-size:13px;font-weight:600;min-height:46px;padding:13px 20px;text-decoration:none;line-height:1.5}.button.primary{background:var(--green);color:white}.button.light{background:var(--paper);color:var(--green)}.button.secondary{border:1px solid var(--line);background:transparent}.button.ghost{background:transparent;color:var(--muted)}.button span{font-size:19px;font-weight:400}.progress-card{border:1px solid var(--line);border-radius:var(--radius);padding:29px 28px;background:#eceee5;display:flex;flex-direction:column;justify-content:center}.section-kicker{font-size:12px;color:var(--muted)}.progress-number{font-family:Georgia,serif;font-size:46px;letter-spacing:-2px;margin:8px 0 15px;line-height:1}.progress-number small{font-family:inherit;font-size:22px;letter-spacing:0;color:#909a8e}.progress-dots{display:flex;gap:7px;margin-bottom:15px}.progress-dots i{flex:1;height:5px;background:#d2d8cb;border-radius:5px}.progress-dots i.done{background:var(--green)}.progress-card p{font-size:11px;color:var(--muted);margin:0;line-height:1.8}.section-title{display:flex;align-items:end;justify-content:space-between;margin-bottom:22px;gap:20px}.section-title h2{font-size:21px;font-weight:500;letter-spacing:-.6px;margin:7px 0 0}.section-title p{font-size:11px;color:var(--muted);margin:0;line-height:1.6}.lesson-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:17px}.lesson-card{width:100%;border:1px solid var(--line);border-radius:13px;background:var(--card);padding:23px;text-align:left;display:flex;flex-direction:column;min-height:222px;position:relative;transition:border-color .2s,box-shadow .2s,transform .2s}.lesson-card:hover{border-color:#8a9c86;box-shadow:0 5px 15px #243b3209;transform:translateY(-2px)}.lesson-card-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.day-label{font-size:10px;font-weight:700;letter-spacing:1.4px;color:var(--muted)}.tag{font-size:10px;padding:5px 9px;border-radius:5px;background:#edf0e6;color:#5e715b;letter-spacing:.4px}.tag.finance{background:#f1e9dd;color:#8c693d}.tag.management{background:#e8ecee;color:#5d707c}.tag.sales{background:#f1e5dd;color:#976950}.lesson-card h3{font-size:18px;font-weight:500;line-height:1.5;margin-bottom:8px}.lesson-card .english-title{font-family:Georgia,serif;font-size:14px;line-height:1.45;color:var(--muted);margin-bottom:26px}.card-bottom{margin-top:auto;display:flex;justify-content:space-between;align-items:center;font-size:10px;color:var(--muted);gap:10px}.card-bottom .arrow{font-size:22px;color:var(--ink)}.card-completed{color:var(--green);font-size:11px}.method-card{padding:24px;border:1px dashed #c7cfbe;border-radius:13px;display:flex;flex-direction:column;justify-content:center;background:#eef0e7;grid-column:span 2}.method-card h3{font-family:Georgia,"Songti SC",serif;font-size:19px;font-weight:400;margin-bottom:20px}.method-steps{display:flex;gap:14px;align-items:start}.method-steps>div{flex:1}.method-steps strong{font-family:Georgia,serif;font-weight:400;font-size:24px;display:block;margin-bottom:6px}.method-steps strong span{font-size:11px;color:var(--muted);margin-left:3px}.method-steps p{font-size:11px;line-height:1.8;margin:0;color:var(--muted)}.method-divider{color:#b5beaa;padding-top:6px}.site-footer{display:flex;justify-content:space-between;gap:24px;align-items:center;padding:35px 0 29px;margin-top:38px;border-top:1px solid var(--line);color:var(--muted);font-size:10px;line-height:1.8}.site-footer p{margin:0}.site-footer .button{font-size:10px;min-height:40px;padding:8px 0;white-space:nowrap}.reader-shell{width:min(810px,calc(100% - 48px));margin:auto}.reader-topbar{height:75px;display:flex;align-items:center;justify-content:space-between}.reader-topbar .brand{font-size:29px}.back-button{font-size:12px;color:var(--muted);background:transparent;padding:12px 0;display:flex;gap:10px;align-items:center}.reader-toolbar{position:sticky;top:0;z-index:5;background:#f5f3ebf5;backdrop-filter:blur(10px);border-top:1px solid var(--line);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:9px 0;gap:14px}.timer-wrap{display:flex;align-items:center;gap:10px}.timer-time{font-size:18px;font-variant-numeric:tabular-nums;letter-spacing:1px;font-weight:500;min-width:57px}.timer-label{font-size:10px;color:var(--muted)}.icon-button{background:transparent;min-width:38px;min-height:40px;padding:8px;border:1px solid var(--line);border-radius:8px;display:inline-flex;align-items:center;justify-content:center}.timer-button{font-size:11px;min-height:37px;padding:8px 12px;border-radius:8px;background:var(--green);color:white;min-width:54px}.font-controls{display:flex;align-items:center;gap:5px}.font-controls .icon-button{min-width:35px;min-height:36px;font-family:Georgia,serif}.font-controls span{font-size:10px;color:var(--muted);margin-right:5px}.reader-heading{padding-top:48px}.reader-heading h1{font-family:Georgia,"Times New Roman",serif;font-size:43px;line-height:1.17;font-weight:400;letter-spacing:-1.4px;margin:17px 0 12px;max-width:700px}.reader-heading .zh-title{font-size:21px;font-weight:400;line-height:1.6;margin:0 0 20px}.reader-meta{font-size:11px;color:var(--muted);display:flex;gap:15px;flex-wrap:wrap}.source-box{border:1px solid var(--line);background:#eceee6;border-radius:12px;padding:20px 22px;margin:29px 0 34px}.source-box h2{font-size:11px;letter-spacing:1px;margin-bottom:11px;font-weight:600;color:var(--muted)}.source-title{font-family:Georgia,"Songti SC",serif;font-size:17px;line-height:1.6;margin-bottom:7px;display:block;text-decoration:none}.source-link{font-size:11px;line-height:1.7;display:inline-flex;align-items:center;gap:8px;word-break:break-word;overflow-wrap:anywhere;color:var(--green)}.source-scope{font-size:12px;line-height:1.9;margin:14px 0 9px}.source-license{font-size:10px;line-height:1.9;color:var(--muted);margin:0;padding-top:11px;border-top:1px solid #d4dacb}.reading-plan{display:flex;gap:0;border-bottom:1px solid var(--line);padding-bottom:20px;margin-bottom:38px}.reading-plan>div{flex:1;border-right:1px solid var(--line);padding:0 18px}.reading-plan>div:first-child{padding-left:0}.reading-plan>div:last-child{border:0;padding-right:0}.reading-plan b{display:block;font-size:11px;font-weight:500;margin-bottom:7px}.reading-plan small{font-size:10px;color:var(--muted)}.article-label{display:flex;justify-content:space-between;gap:15px;align-items:center;margin-bottom:17px}.article-label h2{font-size:11px;letter-spacing:1.5px;margin:0;font-weight:600}.article-label span{font-size:10px;color:var(--muted)}.reading-article{font-family:Georgia,"Times New Roman",serif;font-size:var(--read-size);line-height:1.85;color:#34423a}.reading-article p{margin-bottom:1.35em}.reading-article .paragraph-number{font-family:Inter,sans-serif;color:#9ea899;font-size:10px;vertical-align:middle;display:block;letter-spacing:1px;margin-bottom:1px}.vocab-word{font-family:inherit;font-size:inherit;line-height:inherit;border-bottom:1px dashed #a4ac85;background:#e8ebdc75;padding:0 1px;color:inherit;border-radius:2px}.vocab-word:hover{background:#dde3c9}.study-section{border-top:1px solid var(--line);padding-top:30px;margin-top:38px}.study-section h2{font-size:20px;font-weight:500;margin:7px 0 11px}.study-section .section-intro{font-size:12px;line-height:1.8;color:var(--muted);margin-bottom:22px}.vocab-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:11px}.vocab-item{text-align:left;border:1px solid var(--line);border-radius:10px;background:var(--card);padding:17px;min-height:85px;display:flex;align-items:center;justify-content:space-between;gap:14px}.vocab-item strong{font-family:Georgia,serif;font-weight:400;font-size:18px;line-height:1.45;display:block}.vocab-item span{font-size:10px;color:var(--muted);margin-top:4px;display:block}.vocab-item .plus{font-family:inherit;font-size:20px;color:#8d9a86;flex-shrink:0}.aid-detail,.question-detail{border-bottom:1px solid var(--line);padding:18px 0}.aid-detail summary,.question-detail summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;gap:20px;align-items:center;min-height:44px;line-height:1.65;font-size:14px}.aid-detail summary::-webkit-details-marker,.question-detail summary::-webkit-details-marker{display:none}.aid-detail summary:after,.question-detail summary:after{content:"+";font-size:22px;color:#86917e;flex-shrink:0}.aid-detail[open] summary:after,.question-detail[open] summary:after{content:"−"}.aid-body,.answer-body{padding:16px 0 7px;font-size:13px;line-height:1.95;color:#576257}.aid-body .sentence{font-family:Georgia,serif;color:var(--ink);font-size:18px;line-height:1.7;margin-bottom:13px}.aid-body p:last-child,.answer-body p:last-child{margin-bottom:0}.question-detail summary{align-items:baseline}.question-detail .question-number{font-size:10px;color:var(--accent);margin-right:10px;font-weight:700;letter-spacing:1px}.concept-box{padding:28px;border-radius:12px;background:var(--green-light);margin-top:32px;border-left:3px solid #97a585}.concept-box h2{font-size:17px;font-weight:500;line-height:1.6;margin:9px 0 13px}.concept-box p{font-size:13px;line-height:1.95;margin-bottom:0;color:#50614e}.finish-box{margin-top:45px;padding:31px 28px;text-align:center;border:1px solid #cbd1bf;border-radius:14px;background:#fdfcf6}.finish-box h2{font-size:23px;font-weight:500;margin:10px 0}.finish-box p{font-size:12px;line-height:1.9;color:var(--muted);margin-bottom:21px}.finish-box .button{width:260px;max-width:100%}.finish-note{font-size:10px!important;margin-top:14px!important;margin-bottom:0!important}.reader-bottom{display:flex;justify-content:space-between;align-items:center;gap:16px;margin:24px 0 55px}.reader-bottom button{background:transparent;font-size:12px;padding:15px 0;color:var(--muted)}.history-header{padding:50px 0 24px}.history-header h1{font-size:35px;font-weight:500;margin:12px 0 13px}.history-header p{font-size:13px;line-height:1.9;color:var(--muted)}.stat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:20px 0 35px}.stat-card{padding:23px;border:1px solid var(--line);border-radius:12px;background:var(--card)}.stat-card b{display:block;font-family:Georgia,serif;font-weight:400;font-size:38px;margin-bottom:7px}.stat-card span{font-size:11px;color:var(--muted)}.history-item{display:flex;align-items:center;justify-content:space-between;gap:25px;padding:23px 0;border-bottom:1px solid var(--line)}.history-item .history-date{font-size:11px;color:var(--muted);margin-bottom:8px;letter-spacing:.5px}.history-item h3{font-size:16px;font-weight:500;margin:0;line-height:1.6}.history-item .button{white-space:nowrap}.empty-state{border:1px dashed #c7cfbe;background:#eef0e7;padding:50px 24px;border-radius:14px;text-align:center;margin-top:30px}.empty-state h2{font-family:Georgia,"Songti SC",serif;font-weight:400;font-size:25px}.empty-state p{font-size:12px;color:var(--muted);line-height:1.8}.history-actions{display:flex;flex-wrap:wrap;gap:14px;align-items:center;margin:30px 0 50px}.history-actions p{font-size:11px;color:var(--muted);line-height:1.8;margin:0}.privacy-banner{font-size:11px;line-height:1.9;background:#eceee5;border:1px solid var(--line);border-radius:10px;padding:18px 20px;margin-bottom:18px;color:var(--muted)}.loading{height:70vh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:20px}.loading p{font-size:12px;color:var(--muted)}#toast{position:fixed;bottom:calc(25px + env(safe-area-inset-bottom));left:50%;transform:translate(-50%,15px);padding:13px 20px;color:white;background:#243b32f2;border-radius:10px;font-size:12px;line-height:1.6;z-index:40;opacity:0;pointer-events:none;transition:.2s;max-width:calc(100% - 35px);width:max-content;box-shadow:0 4px 20px #0001}#toast.visible{opacity:1;transform:translate(-50%,0)}dialog{border:1px solid var(--line);border-radius:18px;background:var(--paper);color:var(--ink);max-height:90dvh;overflow-y:auto;overscroll-behavior:contain;box-shadow:0 25px 100px #18291f33}dialog::backdrop{background:#16271e77;backdrop-filter:blur(3px)}.close-dialog{position:absolute;right:14px;top:14px;border:0;font-size:26px;color:var(--muted)}.word-dialog{width:440px;max-width:calc(100vw - 32px);padding:35px 27px}.word-dialog h2{font-family:Georgia,serif;font-size:29px;line-height:1.4;font-weight:400;margin:11px 25px 15px 0}.word-dialog .word-meaning{font-size:16px;line-height:1.85}.word-dialog .word-example{font-family:Georgia,serif;border-top:1px solid var(--line);padding-top:17px;font-size:17px;line-height:1.8;color:var(--muted)}.share-dialog{width:450px;max-width:calc(100vw - 24px);padding:31px 24px 23px}.modal-heading{text-align:center;margin:20px 0 20px}.modal-heading .eyebrow{font-size:8px;letter-spacing:1.5px}.modal-heading h2{font-size:23px;font-weight:500;margin:9px 0}.modal-heading p{font-size:11px;color:var(--muted);line-height:1.8}#share-image{display:block;width:100%;height:auto;border-radius:9px;background:#eceee5}.share-actions{display:flex;gap:10px;margin-top:17px}.share-actions .primary{flex:1}.share-actions .secondary{min-width:100px}.privacy-caption{font-size:10px;line-height:1.9;color:var(--muted);text-align:center;margin:15px 0 0}.error-box{max-width:500px;padding:35px;margin:15vh auto;border:1px solid var(--line);border-radius:14px}.error-box p{line-height:1.8}.progress-legend{font-size:10px;color:var(--muted)}.storage-error{padding:14px 18px;background:#f5e3ca;color:#775018;font-size:12px;line-height:1.7}.hidden{display:none!important}
@media(min-width:1350px){.shell{width:1136px}.hero{padding-top:77px}}
@media(max-width:1000px){.shell{width:calc(100% - 56px)}.dashboard{grid-template-columns:1fr 250px}.feature-card{display:block}.feature-card h2{font-size:24px}.feature-card p{margin-bottom:22px}.lesson-grid{grid-template-columns:repeat(2,1fr)}.method-card{grid-column:span 1}.method-steps{gap:9px}.hero h1{font-size:42px}.hero-word{width:230px}.hero-word .big-twenty{font-size:100px}}
@media(max-width:650px){.shell{width:calc(100% - 40px)}.topbar{height:78px}.brand{font-size:31px}.brand-wrap{gap:13px}.brand-tag{font-size:8px;padding-left:12px;line-height:1.8}.nav{gap:0}.nav button{font-size:11px;padding:10px 12px}.nav button:first-child{display:none}.hero{padding:36px 0 28px;gap:12px;align-items:start}.hero h1{font-size:32px;line-height:1.5;letter-spacing:-1.8px;margin:12px 0 12px}.hero p{font-size:11px;line-height:1.85;max-width:260px}.hero .eyebrow{font-size:8px;letter-spacing:1.7px}.hero-word{width:70px;padding:37px 0 0;border-left:0;flex-shrink:0;text-align:right}.hero-word .big-twenty{font-size:56px;letter-spacing:-3px}.hero-word .minute{display:block;font-size:9px;letter-spacing:2px;margin:9px 2px 0 0}.hero-word p,.hero-word:after{display:none}.dashboard{display:flex;flex-direction:column;gap:11px;margin-bottom:32px}.feature-card{padding:25px 24px;min-height:0;border-radius:14px}.feature-card h2{font-size:23px;margin:13px 0 6px}.feature-card p{font-size:14px;margin-bottom:22px;line-height:1.5}.feature-card .eyebrow{font-size:9px}.feature-card .button{width:100%;justify-content:space-between;min-height:46px;padding:12px 17px}.progress-card{border-radius:11px;padding:17px 20px;display:grid;grid-template-columns:1fr auto;gap:4px 20px;align-items:center}.progress-card .section-kicker{font-size:10px}.progress-number{font-size:26px;grid-column:2;grid-row:1/3;margin:0;letter-spacing:-1px}.progress-number small{font-size:15px}.progress-dots{margin:6px 0 0;max-width:190px;gap:5px}.progress-dots i{height:4px}.progress-card p{display:none}.section-title{margin-bottom:16px;gap:10px}.section-title .eyebrow{font-size:8px;letter-spacing:1.6px}.section-title h2{font-size:19px;margin-top:5px}.section-title p{font-size:9px;max-width:120px;text-align:right}.lesson-grid{grid-template-columns:1fr;gap:11px}.lesson-card{min-height:0;padding:19px 20px;border-radius:11px}.lesson-card-top{margin-bottom:12px}.lesson-card h3{font-size:18px;margin-bottom:5px}.lesson-card .english-title{font-size:13px;margin-bottom:16px}.card-bottom{font-size:9px}.lesson-card-top .tag{font-size:9px;padding:4px 8px}.card-bottom .arrow{font-size:20px}.method-card{padding:22px 20px;margin-top:5px;grid-column:1}.method-card h3{font-size:19px;margin-bottom:22px}.method-steps{gap:12px}.method-steps strong{font-size:25px}.method-steps p{font-size:10px}.site-footer{margin-top:28px;padding:24px 0 27px;display:block;font-size:9px}.site-footer .button{font-size:9px;min-height:35px;margin-top:9px}.reader-shell{width:calc(100% - 40px)}.reader-topbar{height:67px}.reader-topbar .brand{font-size:27px}.reader-toolbar{padding:9px 0;gap:8px}.timer-wrap{gap:7px}.timer-time{font-size:17px;min-width:54px}.timer-label{display:none}.timer-button{font-size:10px;padding:8px 10px;min-width:46px}.timer-wrap .icon-button{min-width:32px;min-height:34px;padding:7px}.font-controls span{display:none}.font-controls .icon-button{min-width:32px;min-height:34px;padding:7px;font-size:14px}.reader-heading{padding-top:33px}.reader-heading h1{font-size:35px;line-height:1.18;letter-spacing:-.9px;margin:14px 0 12px}.reader-heading .zh-title{font-size:19px;margin-bottom:17px}.reader-meta{font-size:10px;gap:12px}.source-box{padding:18px;margin:24px 0 26px;border-radius:10px}.source-title{font-size:16px}.source-box h2{font-size:10px}.source-link{font-size:10px}.source-scope{font-size:11px;line-height:1.9;margin:12px 0 10px}.source-license{font-size:9px}.reading-plan{margin-bottom:27px;padding-bottom:19px}.reading-plan>div{padding:0 11px}.reading-plan b{font-size:10px}.reading-plan small{font-size:9px;line-height:1.7;display:block}.article-label h2{font-size:10px;letter-spacing:1px}.article-label span{font-size:9px}.reading-article{font-size:calc(var(--read-size) - 1px);line-height:1.85}.reading-article p{margin-bottom:1.3em}.study-section{margin-top:30px;padding-top:25px}.study-section h2{font-size:20px}.study-section .section-intro{font-size:11px;margin-bottom:17px}.vocab-grid{gap:9px}.vocab-item{padding:14px 12px;min-height:82px;gap:6px}.vocab-item strong{font-size:16px}.vocab-item span{font-size:9px}.vocab-item .plus{font-size:18px}.aid-detail,.question-detail{padding:14px 0}.aid-detail summary,.question-detail summary{font-size:13px;gap:12px}.aid-body,.answer-body{font-size:12px}.aid-body .sentence{font-size:17px}.concept-box{padding:22px 20px;margin-top:26px}.concept-box h2{font-size:17px}.concept-box p{font-size:12px}.finish-box{padding:26px 20px;margin-top:32px}.finish-box h2{font-size:22px}.finish-box p{font-size:11px}.finish-box .button{width:100%}.reader-bottom{margin-bottom:31px}.reader-bottom button{font-size:11px}.history-header{padding-top:37px}.history-header h1{font-size:29px}.history-header p{font-size:12px}.stat-grid{gap:9px;margin:5px 0 24px}.stat-card{padding:19px 14px}.stat-card b{font-size:29px}.stat-card span{font-size:9px}.history-item{padding:19px 0;gap:16px}.history-item h3{font-size:14px}.history-item .button{font-size:10px;padding:10px 11px;min-height:42px;gap:6px}.history-item .history-date{font-size:10px}.history-actions{gap:15px}.privacy-banner{font-size:10px;padding:15px 17px}.share-dialog{padding:30px 18px 21px;max-height:94dvh}.modal-heading{margin:13px 0 17px}.modal-heading h2{font-size:21px}.share-actions .button{font-size:11px;gap:9px;padding:12px 14px}.share-actions .secondary{min-width:94px}.privacy-caption{font-size:9px}.word-dialog{padding:31px 23px}.reader-heading>.eyebrow{font-size:9px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
.source-author{font-size:11px;color:var(--muted);line-height:1.6;margin-bottom:9px}.source-open{margin:5px 0 13px;min-width:240px;justify-content:space-between}.source-link{display:block;margin-bottom:14px}.reading-focus h2{font-size:20px;font-weight:500;margin:8px 0 14px}.reading-focus>p{font-family:Georgia,serif;font-size:21px;line-height:1.75;margin-bottom:14px}.reading-focus .focus-note{font-family:inherit;font-size:12px;line-height:1.85;color:var(--muted)}.original-detail>summary{display:flex;align-items:center;justify-content:space-between;gap:20px;cursor:pointer;list-style:none;min-height:62px}.original-detail>summary::-webkit-details-marker{display:none}.original-detail>summary strong{font-size:18px;font-weight:500;display:block;margin-bottom:8px;line-height:1.6}.original-detail>summary small{font-size:11px;color:var(--muted)}.original-detail>summary .expand-symbol{font-size:23px;color:var(--muted)}.original-detail[open]>summary .expand-symbol{font-size:0}.original-detail[open]>summary .expand-symbol:after{content:'−';font-size:23px}.original-intro{border-left:2px solid #bbc4af;margin:23px 0 25px;padding:4px 0 4px 15px;font-size:11px;line-height:1.9;color:var(--muted)}.original-section .eyebrow{margin-bottom:10px}.sentence-chunks{color:#8a714c;font-size:12px;padding:10px 14px;background:#efeadd;border-radius:6px}.concept-box .assumptions{margin-top:16px;padding-top:14px;border-top:1px solid #d0d8c7;font-size:11px}.assumptions strong{font-weight:500}.answer-label{display:block;font-size:10px;letter-spacing:.5px;color:var(--accent);margin-bottom:10px}.summary-starter{font-family:Georgia,serif;font-style:italic;font-size:18px;color:#87927e;margin:24px 0 0;line-height:1.8}.stat-denominator{font-size:18px;color:#929c88}.word-footnote{font-size:10px;color:var(--muted);line-height:1.8;margin-bottom:0}
@media(max-width:650px){.source-open{width:100%;min-width:0;font-size:12px;margin-top:3px}.source-author{font-size:10px}.source-link{font-size:9px;line-height:1.7}.reading-focus h2{font-size:19px}.reading-focus>p{font-size:20px}.reading-focus .focus-note{font-size:11px}.original-detail>summary strong{font-size:17px}.original-detail>summary small{font-size:10px}.original-intro{font-size:10px}.concept-box .assumptions{font-size:11px}.summary-starter{font-size:17px}.stat-denominator{font-size:14px}}

.source-length{font-size:10px;color:var(--muted);margin:0 0 14px}.source-license a{font-size:inherit;color:var(--green)}

.privacy-details{margin:8px 0;font-size:inherit;line-height:1.9}.privacy-details summary{cursor:pointer;text-decoration:underline;text-underline-offset:3px}.privacy-details p,.local-date-note{margin:8px 0 0}.privacy-details p:last-child{margin-bottom:0}

/* iPhone home-screen experience. No external assets, analytics, or service worker. */
html{-webkit-text-size-adjust:100%;scroll-padding-top:90px}body{padding-top:env(safe-area-inset-top,0px);padding-left:env(safe-area-inset-left,0px);padding-right:env(safe-area-inset-right,0px);padding-bottom:env(safe-area-inset-bottom,0px)}
.install-banner{display:flex;align-items:center;gap:16px;margin-top:22px;padding:18px 20px;border:1px solid var(--line);border-radius:12px;background:#eceee5}.install-banner>div{flex:1}.install-banner p{font-size:15px;margin:4px 0 0;line-height:1.6}.install-banner .button{white-space:nowrap}.dismiss-install{border:0;flex-shrink:0;min-width:44px;min-height:44px}.installed-note{font-size:12px;color:var(--muted);margin-top:23px}.footer-actions{display:flex;flex-direction:column;align-items:flex-start;gap:4px}.install-dialog{width:min(480px,calc(100% - 28px));max-height:90vh;max-height:90dvh;border:1px solid var(--line);border-radius:20px;background:var(--paper);color:var(--ink);padding:32px;overflow-y:auto;overscroll-behavior:contain}.install-app-icon{display:block;border-radius:15px;margin-bottom:22px}.install-dialog h2{font-family:Georgia,"Songti SC",serif;font-size:25px;line-height:1.4;font-weight:500;margin:9px 0 16px}.install-context{font-size:14px;line-height:1.8;color:var(--muted)}.install-steps{list-style:none;counter-reset:install;padding:0;margin:25px 0}.install-steps li{counter-increment:install;position:relative;padding-left:42px;margin:0 0 20px}.install-steps li:before{content:counter(install);position:absolute;left:0;top:0;width:28px;height:28px;display:grid;place-items:center;border-radius:50%;background:var(--green-light);font-family:Georgia,serif;color:var(--green)}.install-steps strong{font-size:14px;line-height:1.7;display:block}.install-steps span{display:block;font-size:12px;line-height:1.8;color:var(--muted);margin-top:4px}.install-note{border-top:1px solid var(--line);padding-top:18px;font-size:12px;line-height:1.8;color:var(--muted)}.install-note strong{color:var(--ink)}.install-note p{margin:9px 0}.install-done{width:100%;margin-top:16px}.clear-local{color:#86513e!important}.history-actions{flex-wrap:wrap}.close-dialog{min-height:44px;min-width:44px}.privacy-details summary{min-height:44px;display:flex;align-items:center}.reader-toolbar{top:env(safe-area-inset-top,0px)}
@media(max-width:650px){
 body{padding-bottom:calc(84px + env(safe-area-inset-bottom,0px))}.topbar{height:75px}.brand-tag{display:block!important}.nav{position:fixed;z-index:8;bottom:0;left:0;right:0;background:#f5f3ebf5;backdrop-filter:blur(12px);border-top:1px solid var(--line);padding:10px max(20px,env(safe-area-inset-left,0px)) calc(10px + env(safe-area-inset-bottom,0px));gap:10px}.nav button{flex:1;min-height:46px;font-size:14px}.reader-bottom{position:fixed;z-index:8;bottom:0;left:0;right:0;margin:0;background:#f5f3ebf5;backdrop-filter:blur(12px);padding:10px max(20px,env(safe-area-inset-left,0px)) calc(10px + env(safe-area-inset-bottom,0px));gap:14px;border-top:1px solid var(--line)}.reader-bottom button{min-height:46px;font-size:12px;padding:8px}.reader-toolbar{gap:8px}.timer-wrap{gap:5px}.timer-button,.timer-wrap .icon-button,.font-controls .icon-button{min-height:44px;min-width:44px}.font-controls{gap:4px}.font-controls .icon-button{font-size:15px}.timer-time{font-size:16px;min-width:50px}.source-scope{font-size:13px}.source-license,.source-link,.source-author,.source-length{font-size:11px}.study-section .section-intro,.reading-focus .focus-note,.concept-box .assumptions,.finish-box p{font-size:13px}.concept-box p,.aid-body,.answer-body{font-size:14px}.hero p{font-size:13px}.site-footer,.privacy-banner{font-size:11px;line-height:1.9}.site-footer .button{font-size:11px;min-height:44px}.privacy-caption{font-size:11px;line-height:1.8}.history-item .button{min-height:44px}.reader-shell>.privacy-banner{margin-bottom:20px}.install-banner{padding:14px 12px;gap:8px;flex-wrap:wrap;position:relative;margin-top:18px}.install-banner>div{padding-right:34px;flex-basis:100%}.install-banner p{font-size:14px}.install-banner .button{min-height:44px;padding:9px 15px}.dismiss-install{position:absolute;right:7px;top:9px}.install-dialog{padding:28px 22px;padding-bottom:calc(24px + env(safe-area-inset-bottom,0px))}.install-dialog .eyebrow{font-size:9px;letter-spacing:1.5px}.share-dialog{max-height:88dvh}.share-actions{flex-wrap:wrap}.share-actions .button{flex:1;min-height:46px;white-space:nowrap}#toast{bottom:calc(92px + env(safe-area-inset-bottom,0px))}.history-actions p{font-size:11px;line-height:1.8}
}
@media(max-width:360px){.reader-shell{width:calc(100% - 28px)}.timer-wrap{gap:4px}.timer-time{min-width:45px;font-size:15px}.reader-toolbar{gap:4px}.font-controls{gap:3px}.brand-tag{font-size:9px}.reader-heading h1{font-size:32px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}.lesson-card:hover,button:active{transform:none}}

/* The full lesson is the primary reading surface; references stay below study. */
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.lesson-intro{font-size:14px;line-height:1.9;color:var(--muted);max-width:680px;margin:20px 0 0}
.main-reading{margin-top:30px}.main-reading .article-label{border-top:1px solid var(--line);padding-top:24px;margin-bottom:16px}.main-reading .reading-article{overflow-wrap:break-word}.main-reading .reading-article p:last-child{margin-bottom:30px}
.reading-plan{margin-top:28px;margin-bottom:0;padding:18px 0;border-top:1px solid var(--line)}
.concept-detail{padding:18px 24px}.concept-detail>summary{display:flex;align-items:center;justify-content:space-between;gap:15px;min-height:44px;list-style:none;cursor:pointer;font-size:14px;font-weight:500}.concept-detail>summary::-webkit-details-marker{display:none}.concept-detail .expand-symbol{font-size:22px;color:var(--muted)}.concept-detail[open] .expand-symbol{font-size:0}.concept-detail[open] .expand-symbol:after{content:'−';font-size:22px}.concept-body{padding:7px 0 6px}
.reference-section{margin:38px 0 24px;padding:24px;background:transparent}.reference-section h2{font-size:18px;letter-spacing:0;color:var(--ink);font-weight:500;margin:9px 0 13px}.source-description{font-size:12px;line-height:1.9;color:var(--muted);margin-bottom:18px}.reference-list{margin:0;padding:0;list-style:none}.reference-list li{border-top:1px solid var(--line);padding:14px 0}.reference-list a{font-size:13px;line-height:1.8;display:block;overflow-wrap:anywhere}.reference-list p{font-size:11px;line-height:1.8;color:var(--muted);margin:5px 0 0}.source-license{font-size:11px}
@media(max-width:650px){.lesson-intro{font-size:13px;margin-top:18px}.main-reading{margin-top:24px}.main-reading .article-label{padding-top:21px;align-items:flex-start;gap:12px;flex-wrap:wrap}.main-reading .article-label span{font-size:10px}.reading-article{font-size:var(--read-size)}.concept-detail{padding:14px 18px}.reference-section{padding:20px 18px}.reference-section h2{font-size:18px}.source-description{font-size:12px}.reference-list a{font-size:13px}.reference-list p{font-size:11px}.reading-plan small{font-size:10px}}