@font-face{font-family:StudioSans;src:url('assets/studio-sans.woff2') format('woff2');font-display:swap}@font-face{font-family:StudioSerif;src:url('assets/studio-serif.woff2') format('woff2');font-display:swap}
:root{--bg:#f7f8f4;--paper:#fff;--ink:#233d37;--muted:#7c8781;--green:#173e38;--lime:#d7e9bb;--line:#e3e7df;--accent:#be674f;--sage:#e7eee3;--sand:#f3eee0;--blue:#e5edf2;--rose:#f3e8e2;--radius:18px;--shadow:0 5px 30px #183b3210}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:14px/1.75 StudioSans,'Noto Sans CJK SC','PingFang SC','Microsoft YaHei',sans-serif;-webkit-font-smoothing:antialiased}button,input,textarea,select{font:inherit;color:inherit}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{opacity:.45;cursor:default}button{border:0;background:none}a{color:inherit;text-decoration:none}a:hover{color:var(--accent)}:focus-visible{outline:3px solid #be674f;outline-offset:4px}h1,h2,h3,h4,p{margin:0}h1,h2,h3,h4{line-height:1.4}h1{font-size:34px;letter-spacing:-1px;font-weight:600}h2{font-size:21px}h3{font-size:17px}small,.small{font-size:12px}svg{display:block}.icon{width:20px;height:20px;flex-shrink:0}.serif{font-family:StudioSerif,'Noto Serif CJK SC','Songti SC',serif}.muted{color:var(--muted)}.tiny-label{font-size:10px;text-transform:uppercase;letter-spacing:1.8px;color:var(--muted)}.skip{position:fixed;top:-60px;left:20px;background:var(--green);color:white;padding:10px;z-index:99}.skip:focus{top:10px}
.sidebar{width:238px;position:fixed;left:0;top:0;bottom:0;background:var(--paper);border-right:1px solid var(--line);padding:32px 23px 22px;display:flex;flex-direction:column;z-index:30}.brand{display:flex;align-items:center;gap:11px;font-size:24px;font-weight:600;letter-spacing:2px}.brand-mark{width:44px;height:44px;background:var(--green);color:var(--lime);border-radius:12px;display:grid;place-items:center;font-family:StudioSerif,serif;font-size:25px}.brand-sub{display:block;font-size:8px;letter-spacing:2px;font-weight:400;color:var(--muted);margin-top:0}.course-name{display:flex;flex-direction:column;gap:9px;margin:35px 4px 29px}.course-name strong{font-size:13px}.course-tag{background:#f4f6f1;color:#68796c;font-size:11px;border:1px solid var(--line);padding:3px 9px;border-radius:6px;width:max-content}nav{display:flex;flex-direction:column;gap:6px}.nav-link{display:flex;align-items:center;gap:13px;color:#758077;padding:12px 13px;border-radius:9px;font-size:13px;font-weight:500}.nav-link .icon{width:18px;height:18px}.nav-link.active{background:var(--green);color:var(--lime)}.nav-link:hover:not(.active){background:#f3f5f0;color:var(--green)}.nav-count{font:11px monospace;background:#e9eddf;border-radius:5px;padding:0 5px;margin-left:auto;color:var(--green)}.nav-link.active .nav-count{background:#456254;color:var(--lime)}.nav-sep{height:1px;background:var(--line);margin:13px 8px}.side-bottom{margin-top:auto;padding:35px 5px 0}.side-progress{font-size:11px;display:flex;justify-content:space-between}.track{height:5px;background:#e9eee5;border-radius:5px;overflow:hidden;margin-top:10px}.track i{display:block;height:100%;background:var(--green);transition:width .4s}.side-bottom p{font-size:10px;color:#889086;margin-top:10px}.side-settings{display:flex;justify-content:space-between;border-top:1px solid var(--line);width:100%;margin-top:25px;padding:16px 0 4px;font-size:11px;color:var(--muted)}.local-note{font-size:9px;color:#99a193;margin-top:12px;display:flex;align-items:center;gap:6px}.dot{display:inline-block;width:5px;height:5px;background:#789867;border-radius:50%}.main-shell{margin-left:238px}.topbar{height:76px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 38px;font-size:11px;background:var(--bg)}#breadcrumb{color:#899286}#breadcrumb span{margin:0 12px;color:#c5c9c0}.top-actions{display:flex;align-items:center;gap:22px}.search-trigger{display:flex;align-items:center;gap:9px;color:#869084;font-size:11px}.search-trigger kbd{border:1px solid #d9dfd4;padding:0 5px;border-radius:4px;font-size:10px;margin-left:18px}.avatar{background:var(--sand);border:1px solid #e8ddc4;display:grid;place-items:center;width:32px;height:32px;border-radius:50%;color:#8c7853;font-size:12px}.menu-toggle{display:none}main{padding:35px 38px 45px;max-width:1500px;margin:auto;min-height:calc(100vh - 140px)}footer{margin:0 38px;padding:22px 0 26px;border-top:1px solid var(--line);display:flex;justify-content:space-between;font-size:10px;color:#949b91}
.page-head{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:26px;gap:16px}.page-head p{font-size:12px;color:var(--muted);margin-top:8px}.eyebrow{font-size:10px;letter-spacing:2px;text-transform:uppercase;margin-bottom:8px;color:#80917e;display:flex;gap:8px;align-items:center}.pill{border:1px solid var(--line);font-size:10px;display:inline-flex;align-items:center;gap:6px;border-radius:50px;padding:4px 10px;background:white;color:#72816e}.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:11px 19px;border-radius:8px;font-size:12px;font-weight:500;line-height:1.6;border:1px solid transparent;transition:transform .15s,background .15s}.btn:hover{transform:translateY(-1px);color:inherit}.btn.primary{background:var(--green);color:#f5f8ed}.btn.primary:hover{background:#29564b;color:white}.btn.secondary{background:white;border-color:var(--line)}.btn.secondary:hover{background:#f5f7f0}.btn.ghost{border-color:#bdcbb0;background:transparent;color:var(--green)}.btn.accent{background:var(--accent);color:white}.btn.sm{padding:7px 12px;font-size:11px}.btn .icon{width:16px;height:16px}.button-row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}.text-link{font-size:12px;color:var(--green);display:inline-flex;gap:7px;align-items:center}.text-link:hover{color:var(--accent)}.text-link .icon{width:15px}.hero{border-radius:var(--radius);background:#e8eee0;display:grid;grid-template-columns:1.12fr 1fr;min-height:300px;overflow:hidden;position:relative;border:1px solid #dce5d0}.hero-text{padding:33px 36px;position:relative;z-index:1}.hero-tag{font-size:10px;letter-spacing:1.5px;color:#6a805d;display:flex;gap:8px;align-items:center}.hero h1{font-size:36px;line-height:1.55;margin-top:16px;letter-spacing:1px}.hero h1 em{font-style:normal;position:relative}.hero h1 em:after{content:'';position:absolute;bottom:-4px;left:0;right:0;border-bottom:3px solid #afc596;border-radius:50%;transform:rotate(-2deg)}.hero-text>p{color:#71816b;font-size:12px;margin-top:13px;margin-bottom:23px;max-width:370px}.hero-art{position:relative;display:flex;align-items:center;justify-content:center;background-image:radial-gradient(#9aac853b 1px,transparent 1px);background-size:18px 18px;margin:25px 18px 25px 0}.hero-art svg{width:100%;max-width:370px;height:270px}.hero-art .art-tag{position:absolute;bottom:2px;right:14px;background:#ffffffde;border:1px solid #dae1cb;border-radius:9px;box-shadow:0 3px 15px #5f735214;font-size:10px;padding:8px 13px;color:#6c7f5e;display:flex;gap:10px;align-items:center}.art-tag strong{font:16px monospace;color:var(--green)}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:20px 0 33px}.stat{background:white;border:1px solid var(--line);border-radius:12px;padding:17px 20px;display:flex;gap:15px;align-items:center}.stat-icon{width:37px;height:37px;background:#f4f6ef;border-radius:10px;display:grid;place-items:center;color:#77896a}.stat-icon .icon{width:18px}.stat strong{font:26px/1.2 Georgia,serif;letter-spacing:-1px}.stat strong span{font:10px StudioSans,sans-serif;color:var(--muted);letter-spacing:0;margin-left:5px}.stat p{font-size:10px;color:var(--muted);margin-top:5px}.section-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:17px;gap:14px}.section-heading h2{font-size:18px}.section-heading p{font-size:11px;color:var(--muted);margin-top:4px}.segmented{display:flex;padding:3px;background:#ecf0e7;border-radius:7px;gap:2px}.segmented button{font-size:10px;color:#7f8a75;padding:6px 10px;border-radius:5px}.segmented button.active{background:white;color:var(--green);box-shadow:0 1px 4px #14322110}.dashboard-lower{display:grid;grid-template-columns:minmax(0,1fr) 284px;gap:24px}.lesson-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.lesson-card{background:white;border:1px solid var(--line);border-radius:12px;padding:19px;position:relative;display:flex;flex-direction:column;transition:border-color .15s,transform .15s;min-width:0}.lesson-card:hover{border-color:#a8bb94;transform:translateY(-2px);color:inherit}.lesson-card-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:17px}.unit-symbol{width:34px;height:34px;display:grid;place-items:center;border-radius:9px}.sage{background:var(--sage);color:#687e5f}.sand{background:var(--sand);color:#9f875b}.blue{background:var(--blue);color:#6d8a9c}.rose{background:var(--rose);color:#aa7a6c}.unit-no{font:10px monospace;letter-spacing:1px;color:#a1aaa0}.lesson-card h3{font-size:14px;margin-bottom:4px}.lesson-card p{font-size:10px;color:var(--muted);line-height:1.7}.lesson-card-foot{display:flex;justify-content:space-between;align-items:center;font-size:9px;color:#8e9885;margin-top:15px;padding-top:11px;border-top:1px solid #eff1ea}.lesson-card-foot .icon{width:14px;height:14px}.complete-check{color:#557749;font-size:10px}.plan-note{font-size:10px;display:flex;gap:9px;color:#859079;margin:0 0 14px;background:#eff3e8;padding:10px 13px;border-radius:7px}.today-card{border-radius:14px;background:#fff;border:1px solid var(--line);padding:23px;align-self:start}.today-head{display:flex;align-items:center;justify-content:space-between}.today-card h3{font-size:14px}.today-card .tiny-label{font-size:8px}.today-steps{margin:22px 0 25px;display:flex;flex-direction:column;gap:18px}.today-step{display:flex;gap:12px;align-items:flex-start}.step-circle{border:1px solid #d9e2cf;border-radius:50%;height:24px;width:24px;flex-shrink:0;display:grid;place-items:center;font:11px Georgia,serif;color:#789168;background:#f8faf4}.today-step strong{font-size:11px;font-weight:500;display:block}.today-step p{font-size:9px;color:var(--muted);margin-top:3px}.today-card .btn{width:100%}.readiness{margin-top:17px;padding:19px 22px;border-radius:14px;background:#efe9df;border:1px solid #e7e0d3}.readiness-top{display:flex;align-items:center;gap:16px}.donut{--p:0;width:54px;height:54px;background:conic-gradient(#a58b63 calc(var(--p)*1%),#ddd5c6 0);border-radius:50%;display:grid;place-items:center;flex-shrink:0}.donut:before{content:'';grid-area:1/1;width:42px;height:42px;background:#efe9df;border-radius:50%}.donut strong{grid-area:1/1;font:15px Georgia,serif;z-index:1;color:#8d7756}.readiness h3{font-size:11px}.readiness p{font-size:9px;color:#9b8b72;margin-top:4px}.quote{margin-top:19px;font-family:StudioSerif,serif;font-size:13px;color:#879478;text-align:center;line-height:2}.quote small{display:block;font-family:StudioSans,sans-serif;font-size:9px;color:#a3ad98}.source-banner{margin-top:24px;display:flex;justify-content:space-between;align-items:center;padding:15px 18px;border:1px dashed #d3dcca;border-radius:10px;color:#879279;font-size:10px;gap:10px}.source-banner .icon{width:18px}.source-banner>div{display:flex;gap:10px;align-items:center}
.panel{background:white;border:1px solid var(--line);border-radius:var(--radius);padding:25px}.panel+.panel{margin-top:18px}.intro-panel{display:flex;align-items:center;gap:22px;margin-bottom:23px;background:#eaf0e3;border-color:#dce5d0}.intro-panel h2{font-size:18px}.intro-panel p{font-size:12px;color:#77856e;margin-top:6px}.intro-panel .unit-symbol{width:52px;height:52px;flex-shrink:0}.intro-panel .unit-symbol .icon{width:28px;height:28px}.learning-layout{display:grid;grid-template-columns:220px minmax(0,1fr);gap:24px}.lesson-outline{position:sticky;top:20px;align-self:start}.outline-link{display:flex;align-items:center;gap:11px;padding:13px 12px;border-radius:9px;color:#8a9286;border:1px solid transparent;font-size:11px;margin-bottom:4px}.outline-link.active{background:white;border-color:var(--line);color:var(--green)}.outline-link span{font:12px Georgia,serif;opacity:.6}.outline-link small{display:block;font-size:9px;margin-top:3px;color:var(--muted)}.outline-link .done{margin-left:auto;font-size:11px;color:#638659}.lesson-body{padding:30px 35px}.lesson-title{display:flex;align-items:center;gap:14px;border-bottom:1px solid var(--line);padding-bottom:24px;margin-bottom:25px}.lesson-title h1{font-size:26px}.lesson-title p{font-size:11px;color:var(--muted);margin-top:5px}.tabs{display:flex;gap:17px;border-bottom:1px solid var(--line);margin-bottom:26px;overflow:auto}.tabs button,.tabs a{font-size:12px;white-space:nowrap;padding:0 0 13px;color:#86917e;border-bottom:2px solid transparent}.tabs .active{color:var(--green);border-bottom-color:var(--green)}.lesson-section{margin-bottom:32px}.lesson-section h3{font-size:17px;margin-bottom:12px;display:flex;gap:9px;align-items:center}.lesson-section h3:before{content:'';width:4px;height:17px;border-radius:2px;background:#b8c9a2;display:block}.lesson-section p,.answer-text{font-size:13px;line-height:2;color:#57685c;white-space:pre-wrap}.lesson-section ol{padding-left:23px;font-size:12px;color:#7a876f}.lesson-section li{padding:3px}.formula{font:13px/1.8 'Courier New',StudioSans,monospace;color:#5b7350;border:1px dashed #bbcbb0;background:#f3f7ed;border-radius:9px;padding:16px;margin-top:15px}.code-block{background:#17352f;color:#d2dfc8;border:1px solid #264b40;border-radius:10px;position:relative;margin-top:15px;overflow:hidden}.code-head{display:flex;justify-content:space-between;align-items:center;padding:9px 15px;border-bottom:1px solid #355246;font-size:9px;color:#95b394;letter-spacing:1px}.copy-btn{font-size:9px;color:#c1d5b0;padding:3px 9px;border:1px solid #48614b;border-radius:4px}.code-block pre{margin:0;padding:19px 20px;overflow:auto;font:12px/1.95 'SFMono-Regular',Consolas,'Liberation Mono',monospace;tab-size:4}.code-comment{color:#839e83}.table-wrap{overflow:auto;margin-top:15px;border:1px solid var(--line);border-radius:9px}table{border-collapse:collapse;width:100%;font-size:11px}th{text-align:left;background:#f3f5ee;color:#77856d;font-weight:500}th,td{padding:10px 13px;border-bottom:1px solid var(--line)}tr:last-child td{border-bottom:0}td{color:#61735e}.note-box{padding:18px 20px;border-left:3px solid #c29880;background:#f7f1e9;border-radius:0 8px 8px 0;margin-top:21px;font-size:12px;color:#9b7961}.note-box strong{display:block;margin-bottom:7px;color:#906c54}.note-box ul{padding-left:18px;margin:8px 0 0}.recall-item{padding:16px 0;border-bottom:1px solid var(--line);font-size:13px}.recall-item strong{color:#99ad83;margin-right:12px}.lesson-complete{display:flex;justify-content:space-between;align-items:center;padding-top:22px;border-top:1px solid var(--line);margin-top:27px;gap:12px}.lesson-complete small{font-size:10px;color:var(--muted)}.q-mini{padding:16px;border:1px solid var(--line);border-radius:9px;display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:10px;font-size:12px}.q-mini small{font-size:9px;display:block;color:#8b967e;margin-top:4px}
.filters{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:22px}.input,select{background:white;border:1px solid #dce2d4;border-radius:7px;padding:9px 12px;min-width:0;font-size:12px}.filters .input{flex:1;min-width:180px}.filter-chip{border:1px solid var(--line);background:white;border-radius:6px;padding:7px 11px;font-size:10px;color:#8d967f}.filter-chip.active{background:var(--green);border-color:var(--green);color:var(--lime)}.question-list{display:grid;gap:11px}.question-row{display:flex;align-items:center;gap:17px;border:1px solid var(--line);background:white;padding:19px 21px;border-radius:11px}.question-index{font:18px Georgia,serif;color:#aeb9a0;min-width:25px}.question-info{flex:1;min-width:0}.question-info h3{font-size:13px}.question-info p{font-size:10px;color:var(--muted);margin-top:4px}.tag{font-size:9px;border:1px solid #dee4d5;border-radius:4px;padding:2px 6px;color:#879875;background:#f5f8f0;white-space:nowrap;display:inline-block}.tag.terracotta{border-color:#ead9ca;background:#fcf3eb;color:#b18865}.question-status{font-size:10px;color:#7a9764;white-space:nowrap}.question-row .icon{width:16px}.empty{text-align:center;background:white;border:1px dashed #d7dfcd;border-radius:15px;padding:50px 20px;color:var(--muted)}.empty .unit-symbol{margin:0 auto 20px;width:54px;height:54px}.empty h2{font-size:18px;color:var(--ink)}.empty p{font-size:12px;margin:8px 0 20px}.question-work{max-width:900px;margin:auto}.back-link{font-size:11px;color:var(--muted);display:flex;gap:7px;align-items:center;margin-bottom:20px}.back-link .icon{width:15px}.work-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:15px;gap:10px}.work-meta{display:flex;align-items:center;gap:8px;font-size:10px;color:var(--muted);flex-wrap:wrap}.question-prompt{font-size:16px;line-height:1.95;margin:18px 0 21px;color:#364f42}.answer-input{width:100%;min-height:190px;resize:vertical;border:1px solid #d8dfcf;border-radius:9px;padding:16px;background:#fbfcf8;font:12px/1.9 Consolas,StudioSans,monospace}.hint-box{background:#f1f5e9;border:1px dashed #c5d2b7;padding:13px 17px;border-radius:8px;font-size:12px;color:#819174;margin-bottom:18px}.options{display:grid;gap:11px;margin:23px 0}.option{display:flex;align-items:center;gap:13px;border:1px solid #dce3d3;border-radius:9px;padding:14px 18px;background:#fcfdf9;text-align:left;font-size:13px;transition:background .15s}.option:hover:not(:disabled){border-color:#a6be8d;background:#f2f6ec}.option.selected{background:#e6eedd;border-color:#749957}.option.correct{background:#ebf4e6;border-color:#759c5b;opacity:1}.option.wrong{background:#fcf0e8;border-color:#bf8569;opacity:1}.option-letter{font:12px monospace;color:#8f9e7e;border:1px solid #dce4d1;border-radius:5px;padding:0 6px;background:white}.feedback{border-radius:9px;background:#eaf3e3;border:1px solid #cfdebf;padding:18px 20px;margin-top:21px;font-size:12px}.feedback.wrong{background:#fcf1e7;border-color:#e4c8b0;color:#9b7558}.feedback strong{display:flex;align-items:center;gap:8px;font-size:14px}.feedback p{margin-top:7px}.feedback .icon{width:18px}.answer-panel{border-top:1px solid var(--line);padding-top:25px;margin-top:23px}.answer-panel h3{margin-bottom:14px}.rubric{padding:17px 20px;background:#f5f7f0;border-radius:9px;margin-top:23px}.rubric h4{font-size:12px;margin-bottom:7px}.rubric p{font-size:10px;color:var(--muted);margin-bottom:12px}.rubric-label{display:flex;align-items:center;gap:9px;font-size:12px;padding:6px 0;cursor:pointer}.rubric-label input{accent-color:var(--green);width:15px;height:15px}.keyword-tag{margin-left:auto;font-size:9px;color:#98a585}.source-link{font-size:10px;color:#849174;border-bottom:1px solid #d8e0ce;margin-left:5px}.practice-head{margin-bottom:20px}.practice-progress{display:flex;justify-content:space-between;font-size:11px;color:var(--muted)}.practice-progress+.track{margin:8px 0 23px}.summary-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin:25px 0}.summary-item{text-align:center;background:#f3f6ec;border-radius:10px;padding:19px}.summary-item strong{display:block;font:31px Georgia,serif;color:#658049}.summary-item span{font-size:11px;color:#8e9a7e}.mode-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:17px}.mode-card{border:1px solid var(--line);background:white;border-radius:13px;padding:24px;display:flex;flex-direction:column;align-items:flex-start}.mode-card h3{margin-top:18px}.mode-card p{font-size:12px;color:var(--muted);margin-top:8px;margin-bottom:21px;flex:1}.mode-card .btn{width:100%}
.lab-layout{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:21px}.lab-card{background:white;border:1px solid var(--line);border-radius:14px;padding:24px;min-width:0}.lab-card h2{font-size:17px}.lab-card>p{font-size:11px;color:var(--muted);margin-top:7px}.lab-controls{display:flex;gap:11px;margin:23px 0;align-items:flex-end;flex-wrap:wrap}.field{display:flex;flex-direction:column;gap:6px;flex:1;min-width:100px;font-size:10px;color:var(--muted)}.field input,.field select{width:100%}.lab-result{background:#f3f7ed;border-radius:10px;border:1px solid #e1e8d6;padding:18px;margin-top:17px}.lab-result .result-value{font:28px Georgia,serif;color:#577646;display:block;margin:4px 0 10px}.result-row{display:flex;justify-content:space-between;gap:10px;font-size:11px;padding:5px 0;color:#819271}.wave-svg{width:100%;height:95px;background:#f8faf4;border-radius:8px;margin-top:14px}.matrix{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:23px 0}.matrix button{padding:14px 4px;background:#f4f7ee;border:1px solid #e1e7d7;border-radius:8px;font:14px monospace;color:#889774}.matrix button.active{background:var(--green);color:var(--lime);border-color:var(--green)}.matrix button small{display:block;font:9px StudioSans,sans-serif;margin-top:6px;opacity:.65}.lab-notice{font-size:10px;color:#96a086;margin-top:12px}.bit-row{display:flex;gap:7px;margin-top:22px;flex-wrap:wrap}.bit-button{display:flex;flex-direction:column;align-items:center;gap:6px;padding:9px 12px;border:1px solid #dce5ce;border-radius:8px;font:15px monospace;background:#f6f9f0}.bit-button small{font:9px StudioSans,sans-serif;color:#94a780}.bit-button.on{background:var(--green);color:var(--lime)}.digit-pair{display:flex;gap:12px;justify-content:center;margin:21px 0}.seven-seg{width:78px;height:130px;background:#18372e;border-radius:9px;box-shadow:inset 0 0 10px #06100b;position:relative}.segment{position:absolute;background:#2b4a3b;clip-path:polygon(10% 0,90% 0,100% 50%,90% 100%,10% 100%,0 50%)}.segment.on{background:#d1e6a6;filter:drop-shadow(0 0 2px #cee39b)}.segment.h{width:44px;height:8px;left:17px}.segment.v{width:8px;height:43px;clip-path:polygon(50% 0,100% 10%,100% 90%,50% 100%,0 90%,0 10%)}.segment.a{top:12px}.segment.g{top:61px}.segment.d{top:110px}.segment.f{top:20px;left:11px}.segment.b{top:20px;right:11px}.segment.e{top:68px;left:11px}.segment.c{top:68px;right:11px}.switch-sim{display:flex;justify-content:center;align-items:center;gap:28px;padding:30px 0}.switch-button{padding:15px 25px;border:1px solid #d0dcc0;border-radius:10px;background:#f4f7ef;font-size:12px}.led-light{width:26px;height:26px;border:4px solid #d9e1d1;border-radius:50%;background:#cbd4c1}.led-light.on{background:#e8a36d;box-shadow:0 0 22px #e8a36d88;border-color:#e4c5a6}
.exam-layout{display:grid;grid-template-columns:minmax(0,1fr) 220px;gap:22px}.exam-sidebar{position:sticky;top:20px;align-self:start}.clock{font:35px Georgia,serif;letter-spacing:1px;color:var(--green);margin-top:10px}.exam-number-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:6px;margin-top:19px}.exam-number-grid button{background:#f2f5e9;border:1px solid #dce6cf;border-radius:5px;padding:5px 0;font:11px monospace}.exam-number-grid button.active{background:var(--green);color:var(--lime)}.exam-number-grid button.answered{border-color:#87a369;background:#dce9ce}.exam-sidebar .btn{width:100%;margin-top:21px}.exam-intro{max-width:760px;margin:auto;padding:35px}.exam-intro h2{font-size:24px}.exam-intro p{margin:12px 0 20px;color:var(--muted);font-size:12px}.exam-feature{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:25px 0}.exam-feature div{padding:17px;background:#f3f6ec;border-radius:10px;text-align:center}.exam-feature strong{font:26px Georgia,serif;display:block}.exam-feature span{font-size:10px;color:var(--muted)}.exam-review-item{border:1px solid var(--line);background:white;border-radius:12px;padding:23px;margin-top:13px}.exam-review-item h3{font-size:14px}.exam-review-item textarea{margin-top:15px;min-height:140px}.exam-review-item details{margin-top:14px;font-size:12px;color:#78876d}.exam-review-item summary{cursor:pointer;color:var(--green)}
.source-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-bottom:25px}.source-card{display:flex;gap:18px;align-items:center}.source-thumb{width:78px;height:102px;object-fit:contain;background:#f3f3ef;border-radius:5px;border:1px solid var(--line);padding:4px}.source-card h3{font-size:14px}.source-card p{font-size:10px;color:var(--muted);margin:5px 0 11px}.correction{border-bottom:1px solid var(--line);padding:20px 0}.correction:first-of-type{padding-top:5px}.correction:last-child{border:0}.correction h3{font-size:14px;margin-bottom:10px;display:flex;justify-content:space-between;gap:10px}.correction p{font-size:12px;line-height:1.9;color:#819077}.correction p+p{color:#607850;margin-top:6px}.correction small{color:var(--muted)}.source-map{margin-top:20px}.source-image{max-width:100%;height:auto;display:block;margin:15px auto;border:1px solid var(--line)}.circuit{width:100%;background:#f8faf4;border-radius:9px;border:1px solid var(--line);margin-top:20px}.sheet-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.sheet-card{background:white;border:1px solid var(--line);border-radius:12px;padding:24px}.sheet-card h3{font-size:15px;margin-bottom:13px}.sheet-card p{font-size:12px;color:#7a8a6d;white-space:pre-line;line-height:1.95}.sheet-card .formula{font-size:11px}.print-only{display:none}
dialog{width:min(700px,calc(100vw - 28px));max-height:90vh;padding:0;border:1px solid #d9e1ce;border-radius:16px;box-shadow:0 20px 90px #173e382c;color:var(--ink);background:var(--bg)}dialog::backdrop{background:#12362b65;backdrop-filter:blur(3px)}.dialog-head{display:flex;justify-content:space-between;gap:20px;align-items:center;border-bottom:1px solid var(--line);padding:19px 23px}.dialog-head h2{font-size:17px}.icon-button{padding:5px 9px;font-size:21px;line-height:1.3;color:#7f8b74}.dialog-body{padding:24px}.dialog-body p{font-size:12px;color:var(--muted);margin-bottom:18px}.dialog-body .field{margin-bottom:15px}.dialog-body .button-row{margin-top:15px}.settings-note{font-size:10px!important;color:#9b9f93!important;margin-top:16px}.search-input{width:100%;font-size:15px;padding:13px 17px;border:1px solid #d5dfc8;border-radius:8px;background:white}.search-results{margin-top:16px;max-height:55vh;overflow:auto}.search-result{display:block;border-bottom:1px solid var(--line);padding:13px 5px;font-size:12px}.search-result small{display:block;color:var(--muted);font-size:10px}.danger-link{font-size:10px;color:#aa7962;margin-top:20px;border-bottom:1px solid #d8bda9}#toast{position:fixed;bottom:28px;left:calc(50% + 119px);transform:translateX(-50%);background:var(--green);color:var(--lime);padding:10px 20px;border-radius:9px;box-shadow:var(--shadow);font-size:12px;z-index:99;opacity:0;pointer-events:none;transition:opacity .2s;max-width:90vw}#toast.show{opacity:1}.mobile-shade{display:none}
@media(min-width:1500px){main{padding:42px 50px}.hero h1{font-size:42px}.hero{min-height:335px}.hero-text{padding:37px 43px}.dashboard-lower{grid-template-columns:minmax(0,1fr) 315px}.lesson-card{padding:23px}}
@media(max-width:1150px){.sidebar{width:210px;padding:29px 17px}.main-shell{margin-left:210px}main{padding:28px 25px}.topbar{padding:0 25px}footer{margin:0 25px}.hero-text{padding:28px}.hero h1{font-size:31px}.hero{grid-template-columns:1.15fr .85fr}.hero-art{margin-right:0}.dashboard-lower{grid-template-columns:minmax(0,1fr) 245px;gap:17px}.today-card{padding:20px}.stats{gap:10px}.stat{padding:15px 12px;gap:10px}.stat-icon{width:30px;height:30px}.stat strong{font-size:23px}.learning-layout{grid-template-columns:185px minmax(0,1fr);gap:17px}.lesson-body{padding:26px}.lesson-card{padding:16px}#toast{left:calc(50% + 105px)}}
@media(max-width:940px){.sidebar{width:180px;padding:24px 12px}.main-shell{margin-left:180px}.brand{font-size:22px}.course-name{margin-top:27px}.course-name strong{font-size:11px}.nav-link{font-size:12px;padding:11px;gap:10px}.dashboard-lower{grid-template-columns:1fr}.dashboard-aside{display:grid;grid-template-columns:1fr 1fr;gap:15px}.readiness{margin-top:0;align-self:start}.quote{display:none}.hero-art svg{height:230px}.hero{min-height:290px}.hero h1{font-size:29px}.hero-text{padding:24px}.stats{grid-template-columns:repeat(2,1fr)}.stat{padding:18px}.learning-layout{grid-template-columns:1fr}.lesson-outline{position:static;display:flex;overflow:auto;gap:8px;padding-bottom:5px}.outline-link{white-space:nowrap;background:white;padding:9px;min-width:145px;gap:7px}.outline-link small{display:none}.lesson-title h1{font-size:24px}.mode-cards{grid-template-columns:1fr}.mode-card{display:grid;grid-template-columns:35px 1fr auto;gap:15px;align-items:center;padding:18px}.mode-card h3{margin:0}.mode-card p{grid-column:2;font-size:11px;margin:0}.mode-card .btn{grid-column:3;grid-row:1/3}.mode-card .unit-symbol{grid-column:1;grid-row:1/3}.lab-layout{grid-template-columns:1fr}.source-grid{grid-template-columns:1fr}.exam-layout{grid-template-columns:1fr}.exam-sidebar{position:static;display:flex;align-items:center;gap:15px;padding:15px 19px;flex-wrap:wrap;grid-row:1}.exam-sidebar .clock{font-size:25px;margin:0}.exam-sidebar .exam-number-grid{margin:0;flex:1;grid-template-columns:repeat(10,1fr)}.exam-sidebar .btn{width:auto;margin:0}.exam-sidebar>p{display:none}.sheet-grid{grid-template-columns:1fr}#toast{left:calc(50% + 90px)}}
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@media print{body{background:white;font-size:11px;color:#111}.sidebar,.topbar,footer,.button-row,.filters,.tabs,.lesson-outline,.back-link,.no-print,dialog,#toast{display:none!important}.main-shell{margin:0}main{padding:0;max-width:100%}.page-head h1{font-size:25px}.sheet-grid{grid-template-columns:repeat(2,1fr)}.sheet-card{break-inside:avoid;border-radius:0;padding:15px}.panel{border:0;padding:0}.learning-layout{display:block}.code-block{background:#fafafa;color:#222;border-color:#ccc;break-inside:avoid}.code-comment{color:#777}.code-head{color:#444;border-color:#ccc}.copy-btn{display:none}.note-box{background:#fafafa;color:#333}.print-only{display:block}.exam-sidebar{display:none!important}}
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@media(max-width:700px){#breadcrumb{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.top-actions{flex-shrink:0}.menu-toggle{flex-shrink:0}}
.sidebar{overflow-y:auto}.nav-shade{display:none;position:fixed;inset:0;z-index:29;background:#173e3866}@media(max-width:700px){.sidebar.open:after{display:none}.sidebar.open+.nav-shade{display:block}}