:root{--bg:#f6f7f9;--ink:#202a35;--muted:#7a8491;--line:#e7eaee;--green:#247963;--mint:#eaf4ef;--orange:#d79956}*{box-sizing:border-box}body{margin:0;background:var(--bg);font-family:Inter,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);font-size:14px;line-height:1.65}button,input,select,textarea{font:inherit}button,a,select{ -webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default;opacity:.55}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #73b8a3;outline-offset:3px}.sidebar{width:228px;background:#fff;border-right:1px solid var(--line);position:fixed;inset:0 auto 0 0;padding:32px 22px;display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:12px;font-size:24px;font-weight:750;letter-spacing:2px}.brand-icon{background:#286f5c;color:#fff;border-radius:12px;width:44px;height:44px;display:grid;place-items:center;font-size:25px}.brand small{display:block;font-size:10px;letter-spacing:1px;font-weight:400;color:var(--muted)}.side-label{font-size:11px;color:#9ba2ab;margin:45px 13px 14px;letter-spacing:1px}nav{display:grid;gap:8px}nav :is(button,a){display:flex;align-items:center;gap:13px;border:0;background:transparent;padding:13px 15px;border-radius:9px;color:#717b88;text-align:left}nav :is(button,a).active{background:var(--mint);color:var(--green);font-weight:650}nav small{margin-left:auto;font-size:10px;background:#edf0f1;padding:0 6px;border-radius:4px}nav span{font-size:13px}.side-bottom{margin-top:auto;color:#7c8791;font-size:11px;padding:15px 9px}.side-bottom p{font-size:10px;color:#a0a6af}.live-dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:#6ba68c;margin-right:5px}main{margin-left:228px;padding:0 44px;max-width:1700px}header{height:82px;display:flex;align-items:center;justify-content:space-between;font-size:12px;color:#89909a;border-bottom:1px solid var(--line)}header b{margin:0 15px;font-weight:400;color:#c7ccd1}.header-right{display:flex;align-items:center;gap:16px}.header-right i{height:12px;border-left:1px solid #ddd}#app{padding:34px 0 25px;min-height:calc(100vh - 140px)}.eyebrow{font-size:10px;letter-spacing:2px;font-weight:650;color:var(--green);text-transform:uppercase}.title-row{display:flex;justify-content:space-between;align-items:center;margin-bottom:22px}h1{font-size:28px;letter-spacing:-.8px;font-weight:650;line-height:1.4;margin:6px 0 8px}h2{font-size:19px;margin:0 0 6px;font-weight:650}h3{font-size:15px;margin:0 0 8px}.muted{color:var(--muted)}p{margin:8px 0}.tag,.pill{display:inline-block;font-size:10px;background:#f0f3f5;border-radius:5px;padding:4px 9px;color:#7b8690}.tag.green{color:var(--green);background:var(--mint)}.hero{display:grid;grid-template-columns:1fr 260px;position:relative;overflow:hidden;background:#edf3ef;border:1px solid #dfe9e2;border-radius:14px;padding:32px 34px;min-height:225px}.hero h2{font-size:28px;line-height:1.6;letter-spacing:-.5px;max-width:520px}.hero p{font-size:12px;color:#75877e}.primary,.secondary{border:0;border-radius:7px;padding:11px 18px;display:inline-flex;align-items:center;justify-content:center;gap:12px;font-size:12px;font-weight:550}.primary{background:var(--green);color:#fff}.primary:hover{background:#1b624f}.secondary{background:white;border:1px solid var(--line);color:#606b77}.text-btn{background:none;border:0;color:var(--green);padding:4px 0;font-size:12px}.hero .primary{margin-top:17px}.hero-art{position:relative;min-height:175px;transform:rotate(-9deg)}.art-card{position:absolute;background:#fffef9;border:1px solid #d9e2d9;box-shadow:0 10px 25px #32553b0d;border-radius:12px;width:160px;height:133px;left:42px;top:20px;padding:21px;color:#71917c}.art-card.back{transform:rotate(18deg);left:64px;top:13px;background:#dce8de}.art-card b{font-size:30px;display:block;color:#38745d}.art-card span{display:block;width:74px;height:5px;background:#e6ece5;margin-top:10px;border-radius:3px}.spark{position:absolute;font-size:26px;color:#98b39e;right:0;top:5px}.hero-art .bubble{position:absolute;bottom:0;right:0;border-radius:25px;padding:5px 12px;background:#fff;color:#6d8e77;font-size:11px;transform:rotate(9deg)}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:22px 0 30px}.stat{background:#fff;border:1px solid var(--line);border-radius:10px;padding:17px 20px}.stat-label{color:#8b929b;font-size:11px}.stat b{display:inline-block;font-size:27px;font-weight:600;margin-right:5px;line-height:1.6}.stat small{color:#9da4ac;font-size:10px}.section-head{display:flex;align-items:center;justify-content:space-between;margin:26px 0 15px}.section-head h2{font-size:16px}.courses{display:grid;grid-template-columns:1fr 1fr;gap:20px}.course{border:1px solid var(--line);border-radius:12px;padding:25px;background:#fff;position:relative}.course-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}.course-icon{width:40px;height:40px;background:#eff3f8;color:#728fb0;border-radius:9px;display:grid;place-items:center;font-size:22px}.course-icon.orange{background:#faf1e7;color:#bf965e}.course h3{font-size:19px}.course p{font-size:12px;color:var(--muted)}.course-meta{font-size:10px;color:#939aa3;margin:15px 0}.progress{height:4px;border-radius:4px;background:#eef1f3;overflow:hidden;margin:9px 0}.progress span{display:block;background:#6d9e8b;height:100%;transition:width .3s}.course-end{display:flex;align-items:center;justify-content:space-between;border-top:1px solid #f1f2f4;margin-top:18px;padding-top:16px;color:#969ea8;font-size:10px}.bottom-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:20px;margin-top:25px}.panel{background:#fff;border:1px solid var(--line);border-radius:12px;padding:24px}.steps{display:flex;gap:13px;align-items:center;margin-top:18px}.step{flex:1}.step b{display:block;font-size:12px}.step small{font-size:10px;color:#929ba5}.step-num{font-size:11px;background:#f2f5f2;color:#6e967d;width:23px;height:23px;display:grid;place-items:center;border-radius:50%;margin-bottom:7px}.quote{font-size:16px;font-weight:550;margin-top:16px}.panel-note{color:#929ba5;font-size:11px}footer{display:flex;justify-content:space-between;border-top:1px solid var(--line);padding:18px 0;font-size:10px;color:#a0a7af}.toolbar{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:20px 0}.toolbar input{min-width:230px;flex:1}.toolbar input,.toolbar select,select,textarea{border:1px solid #dfe4e8;background:#fff;border-radius:7px;padding:10px;color:var(--ink)}.exercise{max-width:860px;margin:0 auto}.question-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:30px}.qtitle{font-size:21px;margin:23px 0;font-weight:550;line-height:1.7}.options{display:grid;gap:12px}.option{display:flex;align-items:center;gap:14px;background:#fff;border:1px solid #e2e6e9;padding:15px;text-align:left;border-radius:8px;color:var(--ink);opacity:1!important}.option:hover:not(:disabled){border-color:#7bad99;background:#f7faf8}.letter{width:29px;height:29px;background:#f4f5f7;border-radius:6px;display:grid;place-items:center;font-size:12px;flex-shrink:0}.option.correct{border-color:#66a286;background:#f0f8f3}.option.wrong{border-color:#dc9a8e;background:#fff4f0}.answer-box{margin-top:24px;padding:20px;background:#f0f7f3;border-radius:9px;line-height:1.9}.answer-box.wrong{background:#fcf5ef}.answer-box p{font-size:13px}.memory{border-left:3px solid #91b59b;padding-left:12px;margin:15px 0;color:#4c795f;font-size:13px}.source{font-size:10px;color:#929a9f;margin-top:20px;overflow-wrap:anywhere}.actions{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:24px;flex-wrap:wrap}.flash{display:flex;flex-direction:column;justify-content:center;align-items:center;width:100%;min-height:300px;padding:35px;background:#fffcf4;border:1px solid #eadfc9;border-radius:15px;text-align:center;color:var(--ink)}.flash h2{font-size:24px;max-width:620px}.flash p{max-width:600px}.flash .eyebrow{color:#ab9362;margin-bottom:18px}.flash small{color:#ad9f85;margin-top:24px}.case-tabs{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:22px}.case-tabs button.active{background:#e7f0eb;border-color:#91b5a5;color:var(--green)}.case-layout{display:grid;grid-template-columns:.85fr 1.15fr;gap:22px}.case-intro{font-size:14px;line-height:2.2}.classify-row{display:grid;grid-template-columns:1fr 135px;gap:15px;align-items:center;padding:14px 0;border-bottom:1px solid var(--line)}.row-feedback{grid-column:1/-1;font-size:12px;padding:8px 12px;border-radius:6px;background:#f1f7f2;color:#55816b}.row-feedback.bad{background:#fff2ee;color:#aa6d5c}textarea{width:100%;min-height:200px;resize:vertical;line-height:1.9}.check-row{display:flex;gap:9px;margin:12px 0;padding:10px;border:1px solid var(--line);border-radius:7px;align-items:flex-start}.check-row input{margin-top:6px;accent-color:var(--green)}.check-row small{display:block;color:var(--muted)}.review-list{display:grid;gap:12px}.review-row{display:flex;align-items:center;gap:15px;justify-content:space-between;background:#fff;border:1px solid var(--line);border-radius:10px;padding:18px}.review-row p{font-size:12px;color:var(--muted)}.empty{text-align:center;padding:65px 20px}.empty .big{font-size:45px;color:#8ab29c}.map-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:15px}.map-group{background:#fff;border:1px solid var(--line);border-radius:10px;padding:18px}.map-group summary{cursor:pointer;font-weight:550;padding:5px}.tree{padding-left:18px;border-left:1px solid #e6ece7;margin:8px 0 8px 8px;font-size:12px}.tree summary{font-weight:400}.tree p{padding-left:15px;color:#77827c}.result{text-align:center}.score{font-size:65px;color:var(--green);font-weight:600}.notice{background:#fbf5e9;border:1px solid #eee4cb;padding:14px;border-radius:8px;font-size:11px;color:#998353;margin-top:20px}#toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#263d33;color:#fff;padding:10px 20px;border-radius:8px;opacity:0;pointer-events:none;transition:opacity .2s;font-size:12px}#toast.show{opacity:1}@media(min-width:1500px){#app{max-width:1200px;margin:auto}}@media(max-width:1100px){main{padding:0 26px}.hero{grid-template-columns:1fr 180px}.hero-art{transform:scale(.8) rotate(-9deg);transform-origin:center}.stats{gap:10px}.stat{padding:15px}.case-layout{grid-template-columns:1fr}}@media(max-width:800px){.sidebar{width:76px;padding:23px 10px}.brand{justify-content:center}.brand>span:last-child,.side-label,nav span,nav small,.side-bottom{display:none}nav{margin-top:35px}nav :is(button,a){justify-content:center;font-size:21px;padding:12px}.brand-icon{width:39px;height:39px}main{margin-left:76px;padding:0 20px}.header-right{display:none}.hero{grid-template-columns:1fr}.hero-art{display:none}.hero h2{font-size:24px}.hero{padding:25px}.stats{grid-template-columns:repeat(2,1fr)}.courses,.bottom-grid,.map-grid{grid-template-columns:1fr}.title-row{align-items:flex-start}h1{font-size:25px}footer span{display:none}.question-card{padding:21px}.qtitle{font-size:18px}}@media(max-width:450px){main{padding:0 13px}.sidebar{width:60px;padding:20px 6px}main{margin-left:60px}.title-row>.tag{display:none}.classify-row{grid-template-columns:1fr}.classify-row select{width:100%}.stat{padding:12px}.stat b{font-size:24px}.hero h2{font-size:21px}.review-row{align-items:flex-start;flex-direction:column}.toolbar input{min-width:100%}.header-right{display:none}.flash{padding:24px 17px}.flash h2{font-size:20px}}
/* 两条独立的学习路径 */
.side-hint{margin:30px 15px;color:#9aa39f;font-size:12px;line-height:2}.learning-lanes{display:grid;grid-template-columns:1fr 1fr;gap:25px;margin-top:30px}.learning-lane{background:white;border:1px solid #dce7e0;border-top:4px solid #40836b;border-radius:13px;padding:28px 30px}.case-lane{border-color:#ebe0d5;border-top-color:#bc8753}.lane-top{display:flex;align-items:center;gap:10px;color:#3d7c63;font-weight:600;margin-bottom:30px}.lane-top small{font-size:10px;font-weight:400;margin-left:auto;color:#89968e}.lane-icon{width:32px;height:32px;background:#edf5ef;display:grid;place-items:center;border-radius:8px}.case-lane .lane-top{color:#a27043}.case-lane .lane-icon{background:#faf0e5}.learning-lane h2{font-size:23px;letter-spacing:-.5px}.learning-lane>p{font-size:12px}.lane-steps{list-style:none;counter-reset:step;padding:0;margin:30px 0}.lane-steps li{counter-increment:step;position:relative;padding:0 0 24px 42px}.lane-steps li:last-child{padding-bottom:0}.lane-steps li:before{content:counter(step);position:absolute;left:0;top:0;width:26px;height:26px;display:grid;place-items:center;border:1px solid #d4e3d8;border-radius:50%;color:#59806a;font-size:12px;background:#f4f8f4;z-index:1}.lane-steps li:not(:last-child):after{content:'';position:absolute;left:13px;top:26px;bottom:0;border-left:1px solid #e5ebe5}.lane-steps b{font-size:14px}.lane-steps p{font-size:12px;color:#8a9298;margin:5px 0 0}.case-lane .lane-steps li:before{border-color:#e7d8c7;color:#a27c52;background:#fdf7ee}.lane-entry{min-height:50px;display:flex;gap:15px;align-items:center;flex-wrap:wrap}.case-lane .primary,body[data-lane="case"] .primary{background:#a57449}.lane-foot{border-top:1px solid #edf0ed;margin-top:22px!important;padding-top:17px;font-size:10px!important;color:#96a098;line-height:1.9}.home-footnote{margin:23px 0;color:#939b97;font-size:12px;text-align:center}.path-caption{font-size:11px;color:#88958c;margin-bottom:12px}.pathbar{display:flex;align-items:center;gap:15px;padding:14px 18px;background:#edf4ef;border:1px solid #dfe9e1;border-radius:10px;margin-bottom:30px}.pathbar button{background:none;border:0;color:#84998a;display:flex;gap:9px;align-items:center;font-size:12px;padding:5px}.pathbar button span{border:1px solid #cddccf;border-radius:50%;width:23px;height:23px;display:grid;place-items:center;font-size:10px}.pathbar .current{color:#286d50;font-weight:650}.pathbar .current span{color:#fff;border-color:#39795b;background:#39795b}.pathbar i{font-style:normal;color:#bdcdbf;font-size:12px}.next-step{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-top:27px;padding:22px 25px;border:1px solid #dfe9e1;background:#edf4ef;border-radius:11px}.next-step b{font-size:13px}.next-step p{font-size:11px;color:#7e8e82;margin-bottom:0}.next-step .primary{flex-shrink:0}.reading-guide{display:flex;justify-content:space-between;gap:20px;padding:23px 27px;background:#fbf5ec;border:1px solid #ece0cf;border-radius:10px}.reading-guide p{font-size:12px;color:#9b846e;line-height:1.9}.reading-pages{text-align:center;min-width:85px;align-self:center}.reading-pages b{font-size:26px;display:block;color:#b48657}.reading-pages span{font-size:10px;color:#aa9580}.pdf-toolbar{display:flex;justify-content:space-between;align-items:center;margin:24px 0 12px;font-size:11px;color:#8a8f95}.pdf-reader{width:100%;height:620px;border:1px solid #e0e0de;border-radius:9px;background:white}.case-recap{display:grid;gap:18px}.recap-title{display:flex;justify-content:space-between;align-items:center;gap:15px}.recap-title h2{font-size:17px}.recap-row{padding:12px 0;border-bottom:1px solid var(--line)}.recap-row b{font-size:13px}.recap-row p{font-size:12px}.recap-row small{color:#8b9197}body[data-lane="case"]{--green:#a57449;--mint:#faf0e5}body[data-lane="case"] .pathbar,body[data-lane="case"] .next-step{background:#fbf4eb;border-color:#ecdfcf}body[data-lane="case"] .pathbar button{color:#ad967f}body[data-lane="case"] .pathbar .current{color:#986b44}body[data-lane="case"] .pathbar .current span{background:#a57449;border-color:#a57449}body[data-lane="case"] .pathbar button span{border-color:#e3cdb5}body[data-lane="case"] .pathbar i{color:#d7c0a8}body[data-lane="case"] .path-caption{color:#a5907d}
@media(max-width:1100px){.learning-lane{padding:22px}.learning-lane h2{font-size:20px}.lane-top{flex-wrap:wrap}.lane-top small{width:100%;margin-left:42px;margin-top:-7px}.pathbar{gap:8px}.pathbar button{font-size:11px;gap:6px}}
@media(max-width:800px){.learning-lanes{grid-template-columns:1fr}.side-hint{display:none}.pathbar{gap:3px;padding:10px 5px;justify-content:space-between}.pathbar button{flex-direction:column;font-size:10px;gap:6px;padding:3px}.next-step{flex-direction:column;align-items:stretch;padding:20px}.pdf-reader{height:520px}.reading-guide{padding:19px}.reading-guide p{font-size:11px}.pdf-toolbar{align-items:flex-start;gap:12px}.pdf-toolbar a{flex-shrink:0;font-size:10px}.home-footnote{text-align:left}}
@media(min-width:680px) and (max-width:800px){.learning-lanes{grid-template-columns:1fr 1fr;gap:15px}.learning-lane{padding:20px 17px}.learning-lane h2{font-size:18px}.lane-top{margin-bottom:22px}.lane-steps p{font-size:11px}.lane-entry{align-items:flex-start;flex-direction:column;gap:8px}.lane-foot{font-size:10px!important}}
@media(max-width:679px){.learning-lanes{gap:18px;margin-top:18px}.learning-lane{padding:20px}.lane-top{margin-bottom:16px}.lane-top small{width:auto;margin:0 0 0 auto}.lane-steps{margin:20px 0}.lane-steps li{padding-bottom:16px}.lane-steps p{display:none}.lane-foot{margin-top:14px!important;padding-top:12px}.lane-entry{gap:9px}.lane-entry .text-btn{font-size:11px}.learning-lane h2{font-size:20px}}
.study-context{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding-bottom:14px;margin-bottom:25px;gap:15px}.study-context>span{font-size:10px;color:#9a9e9b}.lesson-tabs{display:flex;gap:8px;flex-wrap:wrap;margin:25px 0 20px}.lesson-tabs :is(button,a){background:#fff;border:1px solid #e0e6e2;border-radius:7px;padding:9px 13px;color:#829187;font-size:12px}.lesson-tabs :is(button,a).active{border-color:var(--green);background:var(--mint);color:var(--green)}.concept-workspace{display:grid;grid-template-columns:190px 1fr;border:1px solid #e1e6e2;background:#fff;border-radius:13px;overflow:hidden}.concept-list{padding:22px 15px;background:#f5f8f5;border-right:1px solid #e2e9e3}.concept-list .eyebrow{padding:0 10px;margin-bottom:15px}.concept-list :is(button,a){display:flex;justify-content:space-between;align-items:center;width:100%;text-align:left;padding:12px 11px;background:none;border:0;border-radius:7px;color:#83918a;font-size:12px;margin-bottom:6px}.concept-list :is(button,a).active{background:#fff;color:var(--green);box-shadow:0 2px 9px #22342c08;font-weight:600}.concept-body{padding:30px 35px;min-height:395px}.concept-body h2{font-size:27px;margin:22px 0 20px}.concept-explain{font-size:16px;line-height:2.2;max-width:720px}.memory-note{padding:18px 20px;border-radius:9px;background:var(--mint);margin:23px 0}.memory-note span{display:block;font-size:10px;color:var(--green);margin-bottom:8px}.memory-note b{color:var(--green);font-size:16px;font-weight:550}.think-first{font-size:12px;color:#7d8c81}.think-first summary,.source-details summary,.reveal-principle summary{cursor:pointer}.think-first p{padding:8px 0}.source-details{margin-top:27px;border-top:1px solid #edf0ed;padding-top:13px;font-size:11px;color:#a0a69f}.scene-strip{background:#fcf5eb;border:1px solid #eee0cb;border-radius:10px;padding:19px 24px;margin:0 0 20px}.scene-strip b{font-size:13px;color:#946c44}.scene-strip p{font-size:14px;color:#9b7f60}.scene-strip span{font-size:11px;color:#a8947c}body[data-lane="case"] .concept-list{background:#fbf7f1;border-right-color:#eee4d7}.design-problem{padding:16px 20px;background:#f8f7f5;border-left:3px solid #cab090;border-radius:0 7px 7px 0}.design-problem small{font-size:10px;color:#a08e78}.design-problem p{font-size:16px;line-height:1.9}.reveal-principle{margin:20px 0;color:#896d4a;font-size:13px}.reveal-principle .concept-explain{color:var(--ink);font-size:15px}
@media(max-width:1000px){.concept-workspace{grid-template-columns:155px 1fr}.concept-body{padding:25px}.concept-body h2{font-size:23px}.concept-explain{font-size:14px}}
@media(max-width:600px){.concept-workspace{grid-template-columns:1fr}.concept-list{display:flex;gap:6px;flex-wrap:wrap;border-right:0;border-bottom:1px solid #e2e9e3;padding:13px}.concept-list .eyebrow{display:none}.concept-list :is(button,a){width:auto;padding:7px 9px;margin:0;font-size:11px}.concept-list :is(button,a) span{display:none}.concept-body{padding:22px 19px}.concept-body h2{font-size:23px;margin:17px 0}.memory-note{padding:15px}.memory-note b{font-size:14px}.study-context>span{display:none}.lesson-tabs{gap:6px}.lesson-tabs :is(button,a){font-size:11px;padding:7px 10px}}

a.primary,a.secondary{cursor:pointer}a:focus-visible{outline:3px solid #73b8a3;outline-offset:3px}.lesson-tabs a{display:inline-flex;align-items:center}.case-tabs a.active{background:var(--mint);border-color:var(--green);color:var(--green)}
.study-timer{position:fixed;right:24px;bottom:22px;z-index:10;width:212px;padding:14px 15px 12px;background:#fff;border:1px solid #cfddd5;border-radius:11px;box-shadow:0 10px 28px #1d3b2a1a}.study-timer-top{display:flex;align-items:baseline;justify-content:space-between;gap:12px}.study-timer-top span{font-size:12px;color:#587064;font-weight:600}.study-timer-top strong{font-variant-numeric:tabular-nums;font-size:22px;letter-spacing:.5px;line-height:1;color:#245c47}.study-timer-actions{display:flex;gap:7px;margin:12px 0 7px}.study-timer-actions .primary,.study-timer-actions .secondary{flex:1;min-height:32px;padding:6px 8px;font-size:11px}.study-timer-actions .primary:disabled{opacity:.78}.study-timer small{display:block;font-size:10px;line-height:1.4;color:#87928b}@media(max-width:800px){.study-timer{right:16px;bottom:16px;width:196px}}@media(max-width:480px){.study-timer{right:10px;bottom:10px;width:184px;padding:12px}.study-timer-top strong{font-size:20px}.study-timer-actions{margin:9px 0 5px}}
/* Compact reading: one primary action, secondary tools disclosed on demand. */
header{height:48px}.header-right,.side-hint{display:none}#app{padding:20px 0;min-height:calc(100vh - 104px)}main{padding:0 28px}.sidebar{padding-top:23px}.side-label{margin-top:28px}footer{padding:12px 0}.compact-learning{max-width:850px;margin:0 auto}.reading-topline{display:flex;justify-content:space-between;gap:12px;font-size:12px;color:#6f7874;margin-bottom:12px}.reading-topline>span:last-child{white-space:nowrap;color:#919892}.study-directory{margin-bottom:12px}.study-directory>summary,.reading-tools>summary,.reveal-principle>summary{display:inline-flex;align-items:center;gap:9px;list-style:none;cursor:pointer;min-height:34px;padding:6px 11px;border:1px solid #cbd3ce;border-radius:6px;background:#fff;color:#56675c;font-size:12px;font-weight:500}.study-directory>summary::-webkit-details-marker,.reading-tools>summary::-webkit-details-marker,.reveal-principle>summary::-webkit-details-marker{display:none}.study-directory>summary:after,.reading-tools>summary:after,.reveal-principle>summary:after{content:'＋';font-size:14px;color:#61786a}.study-directory[open]>summary:after,.reading-tools[open]>summary:after,.reveal-principle[open]>summary:after{content:'−'}.directory-content{padding:14px;background:#f0f3f1;border:1px solid #dfe5e0;border-radius:8px;margin-top:9px}.directory-content .lesson-tabs{margin:0 0 10px;gap:7px}.directory-content .concept-list{display:flex;flex-wrap:wrap;gap:7px;background:transparent!important;border:0;padding:0}.directory-content .concept-list a,.directory-content .concept-list button{width:auto;display:inline-flex;gap:8px;border:1px solid #cdd8d0;background:#fff;border-radius:6px;padding:7px 10px;margin:0;color:#496351}.directory-content .concept-list .active{border-color:var(--green);background:var(--mint);box-shadow:none}.directory-content .concept-list a:hover{border-color:var(--green)}.reading-sheet.concept-body{padding:24px 26px;min-height:0;border:1px solid #e0e5e1;background:white;border-radius:10px}.reading-sheet h1{font-size:25px;margin:0 0 16px;line-height:1.4}.reading-sheet .concept-explain{font-size:15px;line-height:1.95;margin:0}.reading-sheet .memory-note{margin:19px 0;padding:0 0 0 13px;background:transparent;border-left:3px solid #9cbca9;border-radius:0}.reading-sheet .memory-note span{color:#87948b;margin-bottom:5px}.reading-sheet .memory-note b{font-size:15px;font-weight:550;color:#496e59}.reading-actions{display:flex;gap:12px;justify-content:space-between;align-items:center;border-top:1px solid #edf0ed;padding-top:17px;margin-top:21px;flex-wrap:wrap}.reading-actions .primary{margin-left:auto}.primary,.secondary{min-height:36px;padding:8px 13px}.secondary{border-color:#c8d1ca;color:#566a5c}.secondary:hover,summary:hover{background:#f3f7f4}.reading-tools{margin-top:13px}.reading-tools .source{margin-top:12px;line-height:1.8}.tool-buttons{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}.reading-tools .panel-note{font-size:12px}.scene-caption{color:#8d7e6d;font-size:12px;margin:0 0 15px}.reading-sheet .design-problem{padding:11px 15px}.reading-sheet .design-problem p{font-size:14px;margin:5px 0}.reading-sheet .reveal-principle{margin:13px 0}.reading-sheet .reveal-principle .concept-explain{margin-top:12px}.text-btn{text-decoration:underline;text-underline-offset:3px}nav :is(a,button){border:1px solid #dde3de;background:#fff;padding:10px 12px}nav :is(a,button):hover{border-color:#9bb3a3;background:#f5f8f5}nav .active{border-color:#a4bcae}.learning-lanes{margin-top:18px;gap:18px}.learning-lane{padding:22px}.lane-top{margin-bottom:18px}.lane-steps{margin:20px 0}.lane-steps li{padding-bottom:17px}.lane-foot{margin-top:15px!important;padding-top:12px}.title-row{margin-bottom:16px}.title-row .eyebrow,.title-row>.tag{display:none}.study-context{padding-bottom:9px;margin-bottom:16px}.question-card{padding:22px}.qtitle{margin:15px 0}.options{gap:9px}.option{padding:11px}.case-tabs{gap:8px}.case-tabs a{border-color:#c8d1ca}
@media(max-width:800px){.sidebar{width:86px;padding:17px 8px}.side-label{display:none}main{margin-left:86px;padding:0 17px}nav{margin-top:24px;gap:8px}nav :is(a,button){flex-direction:column;gap:4px;padding:8px 2px;font-size:17px}nav span{display:block;font-size:10px;line-height:1.5;white-space:nowrap}.reading-sheet.concept-body{padding:22px}.reading-topline{font-size:11px}.brand-icon{width:34px;height:34px;font-size:22px}.reading-actions{gap:10px}.reading-actions .primary{font-size:11px}.reading-actions .secondary{font-size:11px}.concept-list a span{display:inline}}
@media(max-width:480px){.sidebar{width:74px;padding:15px 5px}main{margin-left:74px;padding:0 12px}#app{padding-top:15px}.reading-sheet.concept-body{padding:18px 16px}.reading-sheet h1{font-size:23px;margin-bottom:13px}.reading-sheet .concept-explain{font-size:14px}.reading-actions{align-items:stretch}.reading-actions .primary{width:100%;order:0;margin:0}.reading-actions .secondary{order:1;width:100%}.reading-topline{align-items:flex-start;font-size:10px}.directory-content{padding:10px}.study-directory>summary,.reading-tools>summary,.reveal-principle>summary{font-size:11px}.header-right{display:none}}
.chapter-switch{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin:0 0 17px;padding-bottom:13px;border-bottom:1px solid var(--line)}.chapter-switch>span{font-size:11px;color:#918579;margin-right:4px}.chapter-switch .secondary{font-size:11px;min-height:32px;padding:6px 10px}.chapter-switch .selected{background:var(--mint);color:var(--green);border-color:var(--green)}.chapter-library{display:grid;grid-template-columns:1fr 1fr;gap:18px}.chapter-library h2{margin:15px 0 10px}.chapter-library .primary,.chapter-library .secondary{margin-top:15px}.home-chapters{display:grid;gap:18px;margin-top:24px}.home-chapters>div+div{border-top:1px solid var(--line);padding-top:18px}.home-chapters p{font-size:12px;color:#8b938e;margin:5px 0 12px}.reading-sheet .concept-explain+.concept-explain{margin-top:10px}.concept-contrast{margin:16px 0;padding:13px 15px 13px 30px;background:#faf8f4;border-radius:7px;font-size:12px;color:#82725f;line-height:1.9}.requirement-diagram{margin:18px 0 10px;padding:10px;border:1px solid #e9e2d8;border-radius:8px;background:#fffcf7}.requirement-diagram svg{width:100%;height:auto;display:block;max-height:245px}.requirement-diagram svg rect,.requirement-diagram svg circle,.requirement-diagram svg ellipse{fill:#fff;stroke:#ac9377;stroke-width:1.3}.requirement-diagram svg path{fill:none;stroke:#8c7357;stroke-width:1.3}.requirement-diagram svg text{font:13px -apple-system,BlinkMacSystemFont,'PingFang SC',sans-serif;text-anchor:middle;fill:#6a5741}.requirement-diagram figcaption{font-size:10px;line-height:1.6;color:#988875;padding:7px 3px 0}.mini-demo{border:1px solid #e7ddcf;border-radius:8px;background:#fffaf3;padding:15px;margin:17px 0}.demo-label{font-size:11px;color:#947957;margin:0 0 12px}.state-track{display:flex;gap:8px}.state-track span{flex:1;text-align:center;padding:8px;border:1px solid #e3d8c9;border-radius:6px;font-size:12px;color:#a29584;background:#fff}.state-track span.current{border-color:#ab8455;color:#875e31;background:#f7eddd;font-weight:600}.demo-feedback{font-size:11px;color:#8c785f;margin:12px 0 0;line-height:1.8}.mini-demo .secondary{font-size:11px;min-height:34px;padding:7px 10px}.parallel-track{display:grid;gap:7px;text-align:center;font-size:12px;color:#977348}.parallel-track>div{display:flex;gap:10px;border-top:3px solid #a58a67;border-bottom:3px solid #a58a67;padding:9px 0}.parallel-track>div>span{flex:1;padding:8px;background:#fff;border:1px solid #e5d9c6;border-radius:6px}
@media(max-width:650px){.chapter-library{grid-template-columns:1fr}.requirement-diagram{overflow-x:auto}.requirement-diagram svg{min-width:440px}.chapter-switch{gap:6px}.chapter-switch>span{width:100%}.chapter-switch .secondary{font-size:10px;padding:6px 8px}.mini-demo{padding:12px}}

/* 临时训练与阅读页隔离，关闭后原位继续。 */
.training-dialog{box-sizing:border-box;width:min(640px,calc(100% - 28px));max-height:85dvh;padding:24px;border:1px solid #d8ded8;border-radius:16px;background:#fff;color:#263b32;overflow:auto;box-shadow:0 20px 80px #172f2933}
.training-dialog::backdrop{background:rgba(27,40,35,.42)}
.training-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:16px}.training-heading small{color:#64776c;font-size:12px}.training-heading h2{font-size:22px;line-height:1.45;margin:7px 0 0}.training-heading>button{flex-shrink:0}
.training-hint{font-size:13px;color:#66756d;line-height:1.7}.training-content{font-size:15px;line-height:1.8}.training-content p{margin:12px 0}.training-content pre{padding:14px;background:#f3f6f3;border-radius:8px;overflow:auto;font-size:14px}.training-options{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0}.training-options .secondary{white-space:normal;text-align:left;line-height:1.6}.training-options [aria-pressed=true]{background:#e3f0e7;border-color:#347352;color:#205536;box-shadow:inset 0 0 0 1px #347352}.training-input{display:flex;align-items:center;gap:10px;border:1px solid #bfcac2;border-radius:8px;padding:10px 14px;cursor:pointer}.training-input input{width:18px;height:18px;margin:0;accent-color:#347352}.training-feedback:not(:empty){background:#f3f6f3;padding:16px;border-radius:8px}.training-feedback p:last-child{margin-bottom:0}.training-footer{margin-top:22px;border-top:1px solid #e3e8e3;padding-top:16px;display:flex;justify-content:flex-end}.training-ticket{padding:4px 0 16px;border-bottom:1px solid #e3e8e3}.training-content summary{cursor:pointer;padding:8px 12px;border:1px solid #bdc9c0;border-radius:6px;width:fit-content;font-size:14px}.training-dialog button:focus-visible,.training-dialog summary:focus-visible,.training-dialog input:focus-visible{outline:3px solid #397a55;outline-offset:3px}.reading-actions:has(>#nextConcept:only-child){justify-content:flex-end}
@media(max-width:520px){.training-dialog{padding:18px;max-height:88dvh}.training-heading h2{font-size:19px}.training-options{gap:8px}.reading-actions #tinyPractice{max-width:100%;white-space:normal;text-align:left}}

.term-notes{margin:16px 0;padding:12px 14px;background:#f5f7f5;border-radius:8px;font-size:13px;line-height:1.65;cursor:default}.term-caption{font-size:12px;color:#6b786e}.term-notes dl{margin:6px 0 0}.term-notes dl>div{display:flex;align-items:baseline;gap:12px;margin:4px 0}.term-notes dt{min-width:38px;font-weight:700;color:#345b46}.term-notes dd{margin:0;min-width:0;overflow-wrap:anywhere}.term-translation{display:inline-block;margin-left:12px;color:#647068}@media(max-width:520px){.term-translation{display:block;margin-left:0}}

.training-options .secondary.training-correct{border-color:#287046;background:#e7f4eb;color:#195834;box-shadow:inset 0 0 0 1px #287046}.training-options .secondary.training-wrong{border-color:#b44236;background:#fff0ed;color:#94332b;box-shadow:inset 0 0 0 1px #b44236}.training-result-mark{display:inline-block;margin-left:12px;font-weight:700}.training-feedback.training-feedback-correct{background:#e7f4eb;border-left:4px solid #287046}.training-feedback.training-feedback-wrong{background:#fff0ed;border-left:4px solid #b44236}.training-feedback-correct>b{color:#195834}.training-feedback-wrong>b{color:#94332b}

.requirement-diagram.uml-diagram svg{max-height:none}.uml-diagram svg .uml-solid{fill:#6a5741;stroke:#6a5741}.uml-diagram svg .uml-hollow{fill:#fff;stroke:#8c7357}.uml-diagram svg text{font-size:13px}.uml-diagram{cursor:default}

.requirement-diagram.layer-diagram svg{max-height:none}.layer-diagram svg text{font-size:13px}.reading-actions:has(>#layerNext:only-child){justify-content:flex-end}
/* Full choice chapter library: plain content, explicit navigation links. */
.choice-library{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.choice-library .panel{display:flex;flex-direction:column;align-items:flex-start;gap:12px}.choice-library .panel p{line-height:1.8;margin:0}.choice-library .panel .primary{margin-top:auto}.choice-unit-nav{display:flex;flex-wrap:wrap;gap:7px;margin:16px 0;max-height:none}.choice-unit-nav a{padding:7px 11px;border:1px solid var(--line,#dce4df);border-radius:6px;text-decoration:none;color:var(--ink);background:white;font-size:13px}.choice-unit-nav a[aria-current]{background:#245c47;color:white;border-color:#245c47}.choice-unit-nav a:hover{outline:2px solid #88b5a0;outline-offset:1px}.choice-source-tree{padding-left:22px;line-height:1.85;overflow-wrap:anywhere}.choice-source-tree ul{padding-left:20px;border-left:1px solid #dce4df;margin:5px 0 10px}.choice-source-tree li{margin:4px 0}.choice-correction{background:#fff7e9;border-left:3px solid #bd9156;padding:12px 16px;margin:16px 0;font-size:13px;line-height:1.8}.choice-correction p{margin:4px 0}.choice-library a,.reading-actions a{text-decoration:none}.choice-unit-nav a:focus-visible{outline:3px solid #245c47;outline-offset:2px}@media(max-width:700px){.choice-library{grid-template-columns:1fr}.choice-source-tree ul{padding-left:13px}.choice-unit-nav{gap:5px}}
.choice-comparison{width:100%;border-collapse:collapse;margin:20px 0}.choice-comparison th,.choice-comparison td{border:1px solid #dce4df;padding:10px;text-align:center}.choice-comparison caption{padding:8px;font-weight:600}.choice-comparison th{background:#f0f5f2}.choice-subnav{border-top:1px solid #dce4df;padding-top:10px}.choice-unit-nav{padding:0 12px}.choice-subnav{padding-top:10px}.amdahl-bar{height:28px;background:#eef2ef;display:flex;border-radius:4px;overflow:hidden}.amdahl-bar span:first-child{background:#35745a}.amdahl-bar span:last-child{background:#dfad69}.training-dialog input[type=range]{display:block;width:100%;margin:14px 0 22px}