:root{--bg:#0b1220;--panel:#121e30;--panel2:#19283d;--text:#edf3fc;--muted:#93a9c4;--border:#293b54;--accent:#60e5c2;--blue:#6cbaff;--danger:#ff7c81;--shadow:0 20px 60px #0003;color-scheme:dark}body.light{--bg:#f1f5fa;--panel:#fff;--panel2:#e9f0f8;--text:#15263e;--muted:#526882;--border:#c9d6e4;--accent:#087e66;--blue:#186aaa;--danger:#b3293c;--shadow:0 15px 45px #18345112;color-scheme:light}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.65 system-ui,-apple-system,'Segoe UI',sans-serif}button,input,select{font:inherit}button{cursor:pointer;background:var(--panel2);color:var(--text);border:1px solid var(--border);border-radius:8px;padding:9px 15px;transition:.15s}button:hover{border-color:var(--accent);transform:translateY(-1px)}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--blue);outline-offset:3px}button:disabled{opacity:.4;cursor:not-allowed;transform:none}button.primary{background:var(--accent);color:var(--bg);border-color:var(--accent);font-weight:700}select,input[type=number]{background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:6px;padding:7px;max-width:100%}input[type=number]{width:70px}header{padding:22px 4vw;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--border)}.brand{color:var(--text);display:flex;align-items:center;gap:14px;text-decoration:none;font-weight:750;font-size:20px}.brand small{display:block;color:var(--muted);font-size:9px;letter-spacing:2px}.brandmark{display:grid;place-items:center;background:var(--accent);color:var(--bg);height:46px;width:46px;border-radius:12px;font-size:28px}.header-actions,.actions,.controls{display:flex;gap:10px;flex-wrap:wrap}nav{display:flex;gap:8px;padding:12px 4vw;position:sticky;top:0;z-index:10;background:var(--bg);border-bottom:1px solid var(--border);overflow:auto}nav button{white-space:nowrap;background:transparent;border-color:transparent;color:var(--muted)}nav button.active{color:var(--accent);background:var(--panel);border-color:var(--border)}main{max-width:1500px;margin:auto;padding:30px 4vw 60px}.view{display:none}.view.active{display:block;animation:appear .25s ease}.hero{display:grid;grid-template-columns:1.1fr 1fr;gap:6%;padding:34px 0 46px;align-items:center}.eyebrow{letter-spacing:2px;font-size:11px;color:var(--accent);font-weight:700}h1{font-size:38px;line-height:1.25;margin:12px 0 20px;letter-spacing:-1px}.hero h1{font-size:clamp(38px,4.4vw,66px);line-height:1.2}h2{font-size:25px;line-height:1.4;margin:10px 0 20px}h3{font-size:16px;margin:0 0 15px}.lead{color:var(--muted);font-size:18px;line-height:1.9}.hero-stats{display:flex;gap:32px;margin-top:32px;color:var(--muted);font-size:12px}.hero-stats b{display:block;font-size:28px;color:var(--text)}.hero-diagram{position:relative;border:1px solid var(--border);border-radius:24px;background:radial-gradient(ellipse at center,#60e5c211,transparent 70%),var(--panel);box-shadow:var(--shadow);padding:30px;display:grid;grid-template-columns:1fr 1fr;gap:20px}.chip{font-size:11px;color:var(--accent);border:1px solid var(--border);border-radius:20px;padding:4px 12px;display:inline-block}.hero-diagram .chip{grid-column:span 2;width:max-content}.mini-device{padding:22px 15px;border:1px solid var(--border);background:var(--panel2);border-radius:12px;color:var(--muted)}.mini-device b{display:block;color:var(--text);font-size:18px}.orbit{font-size:58px;color:var(--accent);text-align:center;line-height:1.2}.orbit small{display:block;font-size:12px;color:var(--muted)}.hero-diagram p{font-size:12px;color:var(--accent);align-self:center}.safety{border:1px solid #b7904566;border-left:3px solid #e8b654;background:#d99f1210;padding:18px 22px;border-radius:10px;color:var(--muted);font-size:13px}.safety b{display:block;color:#d9a83c;margin-bottom:4px}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:38px 0 22px}.section-heading span,.muted{color:var(--muted);font-size:13px}.lesson-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.lesson-card{text-align:left;padding:24px;min-height:190px;background:var(--panel);box-shadow:var(--shadow)}.lesson-card .num{color:var(--accent);font-size:12px;letter-spacing:2px}.lesson-card h3{font-size:18px;margin:18px 0 8px}.lesson-card p{font-size:13px;color:var(--muted);margin:0}.comparison,.panel{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:22px;margin-top:20px}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;text-align:left;font-size:13px;min-width:650px}th,td{padding:16px;border-bottom:1px solid var(--border)}th{color:var(--muted)}.lab-toolbar{display:flex;gap:14px;align-items:end;flex-wrap:wrap;padding:18px;background:var(--panel);border:1px solid var(--border);border-radius:12px}.lab-toolbar label,.meter label{display:flex;flex-direction:column;gap:5px;font-size:12px;color:var(--muted)}.lab-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:20px;margin-top:24px}.workbench-top{display:flex;justify-content:space-between;background:var(--panel2);padding:12px 20px;border:1px solid var(--border);border-radius:12px 12px 0 0;font-size:13px}.workbench{position:relative;border:1px solid var(--border);background-color:var(--panel);background-image:radial-gradient(var(--border) 1px,transparent 1px);background-size:20px 20px;overflow:visible;border-radius:0 0 12px 12px}.device{border:1px solid var(--border);border-radius:12px;background:var(--panel2);padding:18px;box-shadow:var(--shadow);pointer-events:auto}.device-title{font-size:16px;font-weight:700}.device-sub{font-size:10px;color:var(--muted);margin:4px 0 15px}.device-symbol{font-size:22px;float:right}.ports{display:flex;justify-content:space-between;gap:3px}.port{display:flex;flex-direction:column;gap:5px;align-items:center;border:0;background:none;padding:3px;font-family:monospace;font-size:10px;touch-action:none;position:relative;z-index:2}.port .dot{width:18px;height:18px;border:3px solid var(--muted);border-radius:50%;background:var(--bg)}.port[data-polarity=plus] .dot{border-color:var(--danger)}.port.selected .dot{background:var(--accent);box-shadow:0 0 14px var(--accent);border-color:var(--accent)}.port:hover .dot{border-color:var(--accent)}.device.lit{border-color:var(--accent);box-shadow:0 0 28px #60e5c222}.device .state{font-size:11px;color:var(--accent);min-height:18px;margin-top:10px}.ac-warning{font-size:10px;color:#d9a83c;border:1px dashed #d9a83c77;border-radius:5px;padding:4px;margin-bottom:8px}#wire-layer{position:absolute;width:100%;height:100%;inset:0;overflow:visible;z-index:1;pointer-events:none}.wire{fill:none;stroke:var(--blue);stroke-width:3;opacity:.8;pointer-events:stroke;cursor:pointer}.wire.active{stroke:var(--accent);stroke-dasharray:9 7;animation:flow .6s linear infinite;filter:drop-shadow(0 0 3px var(--accent))}.wire.error{stroke:var(--danger);stroke-dasharray:6 5;animation:flow 1s linear infinite}.wire-hit{stroke:transparent;stroke-width:16;fill:none;pointer-events:stroke;cursor:pointer}.guide{padding:15px;margin:12px 0;background:var(--panel2);border-radius:8px;font-size:13px;color:var(--muted)}.guide strong{color:var(--accent)}.controls{margin:18px 0}.feedback{padding:15px;background:var(--panel);border-left:3px solid var(--accent);border-radius:5px;font-size:13px}.feedback.error{border-color:var(--danger);color:var(--danger)}.settings{display:flex;flex-wrap:wrap;gap:18px;align-items:center;margin-top:18px;font-size:12px;color:var(--muted)}.lab-side .panel{margin-top:0;margin-bottom:16px}.observation{display:flex;justify-content:space-between;padding:10px 0;border-bottom:1px solid var(--border);font-size:12px}.observation b{color:var(--accent)}.wire-item{display:flex;gap:6px;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border);padding:5px 0;font-size:11px}.wire-item button{padding:3px 7px}.meter select{margin-bottom:8px}.meter output{display:block;background:#0b221e;color:#71f0b0;padding:18px 10px;border-radius:8px;font-family:monospace;font-size:18px;margin-top:10px;min-height:70px}.diagnostic-grid{display:grid;grid-template-columns:300px 1fr;gap:20px}.fault-choice{display:block;width:100%;text-align:left;margin-bottom:12px}.fault-choice.active{border-color:var(--accent);color:var(--accent)}.fault-log{min-height:150px;padding:16px;border:1px solid var(--border);border-radius:8px;margin:20px 0;background:var(--bg)}.fault-log p{margin:8px 0;color:var(--muted)}details summary{cursor:pointer;color:var(--accent)}details p{font-size:13px;color:var(--muted)}#loadfault{margin-top:20px}.tree-row{display:flex;gap:14px;align-items:center;margin:18px 0;font-size:13px;flex-wrap:wrap}.tree-row b{padding:12px;background:var(--panel2);border-radius:8px}.source-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.source-card{margin:0;padding:12px;border:1px solid var(--border);background:var(--panel);border-radius:10px}.source-card button{padding:0;width:100%;height:200px;overflow:hidden;background:white}.source-card img{width:100%;height:100%;object-fit:contain}.source-card figcaption{font-size:11px;color:var(--muted);padding-top:8px}.source-text{white-space:pre-wrap;font-size:13px;color:var(--muted)}footer{display:flex;justify-content:space-between;padding:24px 4vw;border-top:1px solid var(--border);font-size:11px;color:var(--muted)}dialog{background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow)}dialog::backdrop{background:#000b;backdrop-filter:blur(6px)}#slides{width: min(1100px,96vw);height:90vh;padding:32px}#slides:fullscreen{width:100vw;height:100vh;border-radius:0}.slide-toolbar,.slide-footer{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:12px;color:var(--muted)}#slide-content{height:calc(100% - 120px);overflow:auto;padding:3vh 4vw}.slide-body{font-size:clamp(18px,2.2vw,28px);line-height:1.8}.slide-body li{margin:16px 0}.slide-visual{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;padding:18px;margin:24px 0;border:1px solid var(--border);border-radius:14px;color:var(--accent);font-family:monospace;font-size:clamp(15px,2vw,25px)}#image-modal{width:95vw;height:94vh;padding:15px}#image-modal img{display:block;max-width:100%;height:calc(100% - 50px);object-fit:contain;margin:auto}#image-modal button{display:block;margin-left:auto}body.presenting{overflow:hidden}@keyframes flow{to{stroke-dashoffset:-32}}@keyframes appear{from{opacity:.3;transform:translateY(5px)}to{opacity:1;transform:none}}@media(max-width:1050px){.lab-layout{grid-template-columns:1fr}.lab-side{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.lesson-grid{grid-template-columns:repeat(2,1fr)}.lab-toolbar{font-size:12px}}@media(max-width:700px){header{padding:14px}.brand{font-size:15px}.brand small{font-size:7px}.brandmark{width:35px;height:35px}.header-actions{gap:5px}.header-actions button{padding:7px;font-size:11px}main{padding:16px}.hero{grid-template-columns:1fr;gap:30px}.hero h1{font-size:42px}.hero-diagram{padding:20px}.section-heading{align-items:start;flex-direction:column;margin-top:28px}.lesson-grid{gap:10px}.lesson-card{padding:18px;min-height:190px}.lab-side{grid-template-columns:1fr}.lab-toolbar{padding:12px}.lab-toolbar label{width:100%}.lab-toolbar select{width:100%}.device-title{font-size:14px}.ports{justify-content:space-around}.port{font-size:11px}.port .dot{width:20px;height:20px}.diagnostic-grid{grid-template-columns:1fr}.source-grid{grid-template-columns:1fr 1fr}.source-card button{height:150px}.controls button{flex:1 1 40%;font-size:12px}footer{flex-direction:column;gap:10px}#slides{padding:16px}.slide-body{font-size:18px}.hero-stats{gap:24px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important}}@media print{body{background:white;color:black}header,nav,footer,.header-actions,.actions,dialog,.view:not(#learn){display:none!important}#learn{display:block!important}.hero{padding:0;grid-template-columns:1fr 1fr}.hero h1{font-size:32px}.lesson-grid{grid-template-columns:repeat(2,1fr)}.lesson-card,.panel,.comparison,.hero-diagram{background:white;color:black;box-shadow:none;break-inside:avoid}.muted,.lesson-card p,.lead{color:#444}main{padding:0}.comparison{page-break-before:always}button{border-color:#aaa}h2{font-size:22px}}

/* 2.0 tangible workbench */
.accessory-panel{display:flex;flex-wrap:wrap;gap:18px;align-items:end;padding:22px;border:1px solid #54718b;border-radius:18px;margin-bottom:14px}.accessory-panel h3{margin:5px 0}.accessory-panel label{display:grid;gap:8px}.accessory-panel p:last-child{flex-basis:100%;margin:0}.load-dashboard{display:flex;gap:16px;margin-bottom:22px}.load-dashboard>div{flex:1;background:#132d34;color:#eafaff;padding:18px;border-radius:14px;display:grid;gap:8px;border:1px solid #318779}.load-dashboard strong{font-size:28px}.load-dashboard small{font-size:17px;color:#a5c4ce}.load-dashboard meter{width:100%;height:16px}.load-dashboard.overload>div{background:#431f26;border-color:#ff6974;animation:alarm 1.2s infinite}.load-dashboard b{font-size:13px}
.lab-layout{grid-template-columns:minmax(0,1fr) 290px}#workbench{position:relative;overflow:visible;min-height:auto;height:auto;padding:24px;background:radial-gradient(circle at 40% 10%,#243f51,#111c29 65%)}#device-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;position:relative;width:100%;align-items:start}.device{position:relative;width:100%;min-width:0;top:auto!important;left:auto!important;right:auto!important;bottom:auto!important;min-height:235px;padding:18px;background:linear-gradient(145deg,#263a4b,#0e1927);border:1px solid #526577;border-radius:16px;box-shadow:0 12px 22px #0008,inset 0 1px #ffffff25;color:#e5f3fc}.device-title{font-size:18px;font-weight:800}.device-sub{font-size:11px}.device-symbol{display:none}.ports{gap:8px;display:flex;flex-wrap:wrap;position:relative;margin-top:20px;justify-content:flex-start}.port{min-height:50px;min-width:56px;background:linear-gradient(#364b35,#162719);border:1px solid #839175;color:#fff;font-weight:800;font-size:13px;padding:8px;box-shadow:0 3px 0 #070e08}.port .dot{width:14px;height:14px;background:radial-gradient(circle,#ddd 20%,#555 25%,#bbb 50%,#333 60%);box-shadow:0 0 0 2px #101010}.port.selected{outline:3px solid #ffc85a}.terminal-face{border:5px solid #06090e;border-radius:22px;background:linear-gradient(110deg,#121820,#303c48,#080b11);margin:14px auto 0;padding:12px 15px;max-width:230px;box-shadow:inset 0 0 0 1px #6b7785,0 8px 10px #0007}.camera{margin:0 auto 10px;border-radius:50%;width:23px;height:23px;border:5px solid #05070a;background:radial-gradient(circle at 40% 35%,#79b9e0,#172e52 35%,black 70%);box-shadow:0 0 0 2px #626971}.face-screen{height:185px;background:#071719;border:2px solid #425960;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:15px;border-radius:6px;color:#71949e}.face-screen span{font-size:64px;line-height:1}.face-screen b{font-size:12px}.face-screen small{font-size:13px}.lit .face-screen{background:radial-gradient(ellipse,#123d48,#041e26);color:#78ffd4;box-shadow:inset 0 0 20px #28adbb33}.rebooting .face-screen{animation:reboot 1.6s infinite}.metal-case{background:linear-gradient(120deg,#86959b,#d9e0df,#667880);border:2px solid #bac2c7;color:#1b2c35;border-radius:5px;padding:14px;margin-top:15px;box-shadow:inset 0 0 8px #fff,0 7px 10px #0009}.metal-case b{font-size:11px;display:block}.metal-case span{font-size:23px;font-weight:900}.rating{font-style:normal}.vents{height:62px;margin-top:12px;background:radial-gradient(circle,#17232a 2px,transparent 3px) 0 0 / 9px 9px;opacity:.8}.ac-warning{font-size:12px;background:#5b4319;color:#ffe3a1;border:1px dashed #d6ab46;padding:9px;margin-top:12px}.controller-face{display:flex;align-items:center;gap:15px;padding:20px 0}.controller-face b{font-size:12px}.controller-face span{font-size:10px}.delay-knob{height:48px;width:48px;flex-shrink:0;border-radius:50%;border:4px solid #17202b;background:repeating-conic-gradient(#727d8a 0 10deg,#384554 10deg 20deg);box-shadow:0 4px 9px #000;transition:transform .4s}.delay-knob:after{content:'';display:block;margin:3px auto;width:4px;height:15px;background:#ffc960;border-radius:3px}.magnet-body{position:relative;background:linear-gradient(#b8c6cb,#667982 48%,#c6d2d6 52%,#7e8c93);height:70px;border:3px solid #3e515c;margin:24px 0 7px;padding:25px 7px;border-radius:4px;box-shadow:0 7px 9px #0009;color:#172c36}.magnet-body b{font-size:10px;letter-spacing:1px}.magnet-led{position:absolute;right:8px;top:8px;width:8px;height:8px;border-radius:50%;background:#f56565;box-shadow:0 0 9px #f55}.lit .magnet-led{background:#74ffb8;box-shadow:0 0 12px #5f9}.armature{background:linear-gradient(#c1cbd1,#5f707a);height:30px;border:2px solid #cad3db;color:#162532;font-size:11px;text-align:center;padding:4px;transform:translate(13px,16px) rotate(4deg);transition:transform .65s cubic-bezier(.2,.8,.3,1);box-shadow:0 7px 8px #0008}.lit .armature{transform:translate(0,-6px)}.physical-button{display:flex;flex-direction:column;justify-content:center;align-items:center;width:120px;height:100px;margin:20px auto;background:linear-gradient(#c7d8ce,#54886e);border:6px solid #344a40;color:#072c1c;font-size:27px;font-weight:900;border-radius:16px;box-shadow:0 8px 0 #0a1a12,0 13px 15px #0007;touch-action:none}.physical-button small{font-size:12px}.pressed .physical-button,.physical-button:active{transform:translateY(6px);box-shadow:0 2px 0 #0a1a12}.adapter-body{background:linear-gradient(120deg,#1c2025,#3c444e,#131920);border:2px solid #525c67;padding:25px 10px;margin:25px 0;border-radius:12px;text-align:center;color:#bfc9d1;box-shadow:0 8px 10px #0008}.device .state{margin-top:18px;color:#b8cbd8;font-size:12px}.device.lit .state{color:#74ffd2}
.wire{stroke-width:6!important;stroke-linecap:round;filter:drop-shadow(0 3px 2px #0009)}.wire.flow{stroke-width:2!important;stroke:#fff6ab!important;stroke-dasharray:2 20;animation:current 1.2s linear infinite;filter:drop-shadow(0 0 4px #ffee8a);pointer-events:none}.wire.active{stroke-dasharray:none;animation:none}.probe-shortcuts{display:flex;gap:6px;margin:10px 0}.probe-shortcuts button{font-size:12px;padding:8px}#beep-wave{height:48px;text-align:center;font-size:25px;color:#45605e;opacity:.4}#beep-wave.ringing{color:#7fffc0;opacity:1;animation:ripple .9s infinite}.meter:has(.ringing){border-color:#6af2bb}.light .workbench{background:#c5d5df}.light .device{color:#effaff}.light .port{color:white}
@keyframes current{to{stroke-dashoffset:-44}}@keyframes ripple{50%{text-shadow:0 0 20px #81ffd1;transform:scale(1.08)}}@keyframes reboot{0%,45%,100%{opacity:.15}50%,80%{opacity:1}}@keyframes alarm{50%{border-color:#ffb253;box-shadow:0 0 15px #ff626230}}
@media(max-width:1050px){.lab-layout{grid-template-columns:1fr}.lab-side{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}.meter{grid-column:span 2}}
@media(max-width:600px){.accessory-panel{padding:14px}.accessory-panel label{width:100%}.load-dashboard{flex-direction:column}#workbench{padding:16px}#device-grid{grid-template-columns:1fr;gap:24px}.device[data-device="terminal"]{grid-row:auto}.device{padding:16px}.lab-side{display:block}.ports{flex-wrap:wrap}.port{min-width:62px}.terminal-face{max-width:210px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important}}