:root{--ink:#19383f;--muted:#698083;--green:#215d50;--lime:#d8f28b;--paper:#f6f8f5;--line:#dfe6df}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.6 'Segoe UI',sans-serif}button,input,select,textarea{font:inherit}button,a,input,select{ -webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{cursor:pointer}a{color:inherit;text-decoration:none}button{border:0;border-radius:10px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #cb911e;outline-offset:4px}.sidebar{position:fixed;inset:0 auto 0 0;width:238px;background:#fff;border-right:1px solid var(--line);padding:34px 24px;display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:12px;font-size:25px;line-height:1.1;font-weight:800;letter-spacing:-1px}.brand-icon{display:grid;place-items:center;background:var(--green);color:var(--lime);width:42px;height:45px;border-radius:13px;font-size:36px}.brand-sub{display:block;font-size:9px;letter-spacing:2px;margin-top:8px}.nav-label{font-size:10px;letter-spacing:2px;color:var(--muted);margin:46px 10px 15px}nav button{display:flex;gap:13px;width:100%;text-align:left;background:none;color:#657578;padding:13px 14px;margin:4px 0}nav button.active{background:#e9f0e6;color:var(--green);font-weight:650}nav .nav-symbol{width:22px;font-size:19px}.sidebar-bottom{margin-top:auto;background:#f4f7ef;border:1px solid #e7ecdf;padding:16px;border-radius:14px;font-size:12px}.sidebar-bottom b{font-size:13px}.sidebar-bottom p{color:var(--muted);line-height:1.6}.offline-dot{display:inline-block;width:7px;height:7px;background:#6c9a49;border-radius:50%;margin-right:6px}.sidebar-bottom small{display:block;margin-top:8px}.subtle{background:transparent;color:var(--green);padding:5px 0;font-size:12px}.shell{margin-left:238px}header{height:85px;padding:0 45px;display:flex;align-items:center;justify-content:space-between;background:#fff;border-bottom:1px solid var(--line);font-size:13px}header>span{font-weight:600}header>span span{color:#dbab48;margin-left:8px}header>div{display:flex;gap:24px;align-items:center}.admin-link{color:var(--muted);font-size:12px}main{max-width:1500px;padding:32px 45px;margin:auto}.hero{min-height:335px;background:#153b42;color:#fff;border-radius:20px;display:flex;position:relative;overflow:hidden;padding:40px}.hero-copy{z-index:1;flex:1}.eyebrow{font-size:10px;letter-spacing:2px;font-weight:700;color:#c5deaa}h1{font-size:clamp(28px,3vw,44px);line-height:1.17;letter-spacing:-1.7px;margin:17px 0}h1 em{font-style:normal;color:var(--lime)}.hero p{color:#c2d3d2;font-size:13px;margin:19px 0 24px}.primary{background:var(--lime);padding:12px 20px;font-weight:650;color:#183831}.primary span{margin-left:24px}.age-note{font-size:10px;margin-left:14px;color:#b7cccc}.hero-art{width:32%;min-width:230px;position:relative;display:grid;place-items:center}.art-grid{position:absolute;inset:-40px;background-image:linear-gradient(#73908b22 1px,transparent 1px),linear-gradient(90deg,#73908b22 1px,transparent 1px);background-size:28px 28px;transform:rotate(-8deg)}.robot{position:relative;transform:rotate(8deg);filter:drop-shadow(10px 16px 0 #0b282d66)}.robot-head{width:140px;height:103px;background:#dceacf;border:8px solid #a9cabe;border-radius:28px;display:flex;align-items:center;justify-content:space-evenly;position:relative}.eye{height:22px;width:15px;border-radius:10px;background:#184a43}.mouth{position:absolute;width:23px;height:7px;border-bottom:3px solid #184a43;bottom:17px;border-radius:50%}.antenna{height:30px;width:5px;background:#c6d7b7;margin:auto}.antenna:before{content:'';display:block;width:15px;height:15px;background:#edb655;border-radius:50%;position:relative;left:-5px;top:-6px}.robot-body{width:112px;height:84px;background:#91b7a7;border-radius:15px;margin:8px auto;display:flex;align-items:center;justify-content:center;gap:7px;border:6px solid #719a8e}.robot-body span{font-size:45px;color:#f3cf71;margin-right:5px}.robot-body i{width:7px;height:7px;background:#ddedc9;border-radius:50%}.robot-feet{width:100px;height:21px;margin:auto;border-left:32px solid #c9dcc0;border-right:32px solid #c9dcc0;border-radius:5px}.float-chip{position:absolute;background:#294e51;border:1px solid #78978b66;padding:8px 13px;font:10px monospace;border-radius:8px;z-index:2}.chip-one{top:2px;left:-25px;transform:rotate(-7deg);color:#d4ed93}.chip-two{bottom:8px;right:-18px;transform:rotate(-6deg);color:#efd8a0}.art-spark{position:absolute;right:2px;top:40px;font-size:42px;color:#e9bd69}.stats{display:grid;grid-template-columns:repeat(4,1fr);padding:24px 0 29px;border-bottom:1px solid var(--line);margin-bottom:32px}.stat{display:flex;align-items:center;justify-content:center;gap:12px;border-right:1px solid var(--line)}.stat:last-child{border:0}.stat strong{font-size:24px;letter-spacing:-1px}.stat span{font-size:11px;color:var(--muted);line-height:1.4}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:20px}.muted{color:#7e8d71}h2{font-size:27px;letter-spacing:-.8px;line-height:1.25;margin:8px 0}.section-heading p{font-size:12px;color:var(--muted);margin-top:8px}.search{display:flex;align-items:center;gap:8px;background:white;border:1px solid var(--line);padding:8px 13px;border-radius:10px;min-width:280px}.search span{font-size:23px}.search input{background:none;border:0;width:100%;outline:0;font-size:12px}.filters{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:20px}#category-tabs{display:flex;gap:6px;flex-wrap:wrap}#category-tabs button,.subcategories button{background:transparent;border:1px solid var(--line);color:var(--muted);padding:7px 12px;font-size:11px}#category-tabs button.active,.subcategories button.active{background:var(--green);color:white;border-color:var(--green)}.filters label{font-size:11px;color:var(--muted);white-space:nowrap}select{padding:7px;background:white;border:1px solid var(--line);border-radius:8px;color:var(--ink);font-size:12px}.subcategories{display:flex;gap:6px;flex-wrap:wrap;margin-top:12px}.result-count{font-size:11px;color:var(--muted);margin:17px 0 12px}.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.card{border:1px solid var(--line);border-radius:14px;background:white;overflow:hidden;text-align:left;padding:0;transition:transform .15s,box-shadow .15s;color:inherit}.card:hover{transform:translateY(-4px);box-shadow:0 10px 24px #163f3310}.card-art{height:142px;display:flex;justify-content:center;align-items:center;position:relative;background:var(--tint,#e6eddf);overflow:hidden}.card-art .symbol{font-size:55px;font-weight:700;color:var(--color,#52745c);font-family:monospace}.card-art img{width:100%;height:100%;object-fit:contain;padding:10px}.card-art .type-label{position:absolute;left:12px;top:12px;background:#ffffffc9;padding:3px 7px;border-radius:5px;font-size:8px;letter-spacing:1px}.card-content{padding:17px}.card-kicker{color:var(--green);font-size:9px;font-weight:650;letter-spacing:1px}.card h3{font-size:16px;line-height:1.35;margin:6px 0 8px}.card p{font-size:11px;color:var(--muted);margin:0;line-height:1.7;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:38px}.card-meta{display:flex;justify-content:space-between;border-top:1px solid #eef1eb;margin-top:15px;padding-top:12px;font-size:10px;color:var(--muted)}.card-meta b{color:var(--green)}.secondary{background:white;border:1px solid var(--line);padding:9px 16px;font-size:12px;color:var(--ink)}#more{display:block;margin:24px auto}.learning-note{display:flex;align-items:center;gap:18px;padding:22px 25px;background:#ecefe2;border-radius:13px;margin-top:28px}.learning-note>span{font-size:35px;color:#83995d}.learning-note h3{font-size:15px;margin:0}.learning-note p{font-size:11px;color:var(--muted);margin:3px 0}.learning-note button{margin-left:auto;white-space:nowrap}footer{display:flex;gap:24px;align-items:center;border-top:1px solid var(--line);padding:22px 45px;font-size:10px;color:var(--muted)}footer b{color:var(--green)}footer a{margin-left:auto}dialog{width:min(950px,94vw);max-height:92vh;padding:35px;border:1px solid var(--line);border-radius:18px;color:var(--ink)}dialog::backdrop{background:#092d36aa;backdrop-filter:blur(4px)}.close{position:sticky;top:0;float:right;padding:8px 12px;z-index:5;background:#edf1e9}.detail-title{padding-right:35px;font-size:30px}.detail-meta{display:flex;gap:10px;flex-wrap:wrap;font-size:12px}.detail-meta span{background:#eef3e8;border-radius:5px;padding:4px 9px}.lesson-section{margin:25px 0}.lesson-section h3{font-size:18px;border-bottom:1px solid var(--line);padding-bottom:8px}.lesson-section li{margin:8px 0}.lesson-section p,.lesson-section li{font-size:14px}.circuit{width:100%;max-height:480px;object-fit:contain;border:1px solid var(--line);border-radius:12px;background:#f8faf5}pre{white-space:pre-wrap;overflow-wrap:anywhere;background:#15323a;color:#daedc5;padding:20px;border-radius:10px;font-size:13px;line-height:1.7}table{border-collapse:collapse;width:100%;font-size:13px}td,th{text-align:left;border:1px solid var(--line);padding:9px}th{background:#eef3e8}.lesson-actions{display:flex;gap:12px;flex-wrap:wrap;margin:20px 0}.quiz button{display:block;text-align:left;padding:10px 15px;margin:7px 0;border:1px solid var(--line);background:#f8faf4;width:100%;color:var(--ink)}.quiz button.correct{background:#dceab9}.quiz button.incorrect{background:#f6d5cc}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);padding:12px 22px;background:#173c39;color:white;border-radius:10px;display:none;z-index:20;font-size:13px}.empty{text-align:center;padding:40px;grid-column:1/-1;color:var(--muted)}[hidden]{display:none!important}.admin-main{max-width:1100px;margin:auto;padding:30px}.panel{background:white;padding:25px;border:1px solid var(--line);border-radius:14px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px}.form-grid label{display:flex;flex-direction:column;gap:5px;font-size:13px}.form-grid input,.form-grid textarea,.form-grid select{width:100%;padding:10px;border:1px solid var(--line);border-radius:6px}.wide{grid-column:1/-1}.form-grid textarea{min-height:120px}.admin-toolbar{display:flex;gap:10px;flex-wrap:wrap;margin:20px 0}.error{color:#9c3028}.success{color:#246242}
@media(min-width:1500px){.hero{min-height:360px}.hero-art{margin-right:40px}}@media(max-width:1150px){.sidebar{width:200px;padding:26px 16px}.shell{margin-left:200px}main{padding:25px}header{padding:0 25px}.hero{padding:30px}.age-note{display:block;margin:10px 0 0}.hero-art{min-width:180px}.cards{gap:12px}.section-heading{align-items:flex-start}.search{min-width:220px}.filters{align-items:flex-start;flex-direction:column}}@media(max-width:800px){.sidebar{position:static;width:auto;padding:16px;border:0;border-bottom:1px solid var(--line)}.brand{font-size:21px}.brand-sub{font-size:8px}.nav-label,.sidebar-bottom{display:none}.sidebar nav{display:flex;overflow:auto;gap:5px;margin-top:15px}.sidebar nav button{width:auto;white-space:nowrap;padding:8px 10px;font-size:12px;margin:0}.nav-symbol{display:none}.shell{margin:0}header{height:60px;padding:0 20px;font-size:11px}header>div{gap:15px}.admin-link{font-size:10px}main{padding:20px}.hero{padding:25px;min-height:290px}.hero-art{min-width:135px;transform:scale(.8);margin-right:-20px}.chip-one{left:-30px;font-size:9px}.chip-two{right:-20px;font-size:9px}h1{font-size:29px}.hero p{font-size:12px}.cards{grid-template-columns:repeat(2,minmax(0,1fr))}.section-heading{flex-direction:column}.search{width:100%}.stats{gap:8px}.stat{gap:7px}.stat strong{font-size:21px}.stat span{font-size:9px}.learning-note{padding:18px;flex-wrap:wrap}.learning-note button{margin-left:0}footer{padding:20px;gap:13px;flex-wrap:wrap}dialog{padding:22px}.form-grid{grid-template-columns:1fr}}@media(max-width:480px){header>span{font-size:10px}.hero-art{display:none}.hero{min-height:310px}.hero-copy{max-width:100%}.stats{grid-template-columns:repeat(2,1fr);row-gap:15px}.stat:nth-child(2){border:0}.card-art{height:112px}.card-content{padding:12px}.card h3{font-size:14px}.card p{font-size:10px}.card-meta{font-size:9px}.detail-title{font-size:24px}.learning-note>span{display:none}#category-tabs button{font-size:10px;padding:7px 9px}}

.mobile-status{display:none}#mobile-sync{font-size:22px;padding:0 6px}@media(max-width:800px){.mobile-status{display:block;margin:0;padding:6px 20px;font-size:11px;color:#61786b;background:#eef3e8}}

.confirm-dialog{max-width:520px;width:calc(100% - 40px);border:0;border-radius:24px;padding:28px;color:var(--ink);}.confirm-dialog::backdrop{background:#173c42aa}.confirm-dialog p{line-height:1.7}

.stats{grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}.stat{background:#fff;border:1px solid var(--line);padding:17px 10px;min-height:78px}.stat:hover{background:#edf5df}.kind-label{display:block;margin:18px 0 8px;color:var(--muted);font-size:13px}.card-art img{object-fit:contain;width:100%;height:100%;padding:12px}.circuit{cursor:zoom-in}.stats .stat:last-child{border:1px solid var(--line)}@media(max-width:720px){.stats{grid-template-columns:repeat(2,minmax(0,1fr))}.stat strong{font-size:26px}.stat span{font-size:12px}.filters{flex-wrap:wrap}}

#figure-viewer{width:min(96vw,1400px);max-width:96vw;padding:20px}.figure-scroll{overflow:auto;max-height:76vh}.figure-scroll img{display:block;width:1200px;max-width:none;height:auto}.circuit{cursor:default}