@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Space+Grotesk:wght@400;500;600;700&display=swap');
:root{--bg:#f4f6f9;--ink:#17263d;--muted:#69778b;--line:#e2e7ee;--blue:#245ce5;--mint:#31c7a2}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:14px 'DM Sans',sans-serif}button,input,select{font:inherit}button,a,input,select{touch-action:manipulation}button{cursor:pointer}a{color:var(--blue)}aside{position:fixed;width:234px;height:100vh;background:#101f35;color:#bbc7d8;padding:30px 20px;display:flex;flex-direction:column}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;color:white;font:700 24px 'Space Grotesk',sans-serif}.brand small{display:block;font:9px 'DM Sans';letter-spacing:1.7px;margin-top:5px}.mark{display:grid;place-items:center;width:42px;height:42px;border:1px solid #53698a;border-radius:12px;color:#74dcc6;font:32px Georgia}.nav-label{font-size:10px;letter-spacing:2px;color:#73849f;margin:42px 12px 14px}nav a{display:block;text-decoration:none;color:#adbbcf;border-radius:8px;padding:12px;margin:3px 0}nav a.active{color:white;background:#243b5b;border-left:3px solid var(--mint)}nav .group{font-size:10px;letter-spacing:1.4px;color:#73849f;margin:24px 12px 8px}.sidebar-bottom{margin-top:auto;font-size:11px}.sidebar-bottom small{display:block;margin-top:10px;color:#73849f}.status-dot{display:inline-block;background:var(--mint);width:6px;height:6px;border-radius:50%;margin-right:7px}.shell{margin-left:234px}header{height:76px;border-bottom:1px solid var(--line);background:#ffffffb0;display:flex;justify-content:space-between;align-items:center;padding:0 36px;color:var(--muted);font-size:12px}header label{display:flex;gap:12px;align-items:center}select{border:1px solid var(--line);background:white;border-radius:6px;padding:9px;color:var(--ink)}main{padding:32px 36px;max-width:1600px;margin:auto}h1,h2,h3{font-family:'Space Grotesk',sans-serif}h1{font-size:34px;letter-spacing:-1.2px;margin:10px 0 14px}h2{font-size:21px;margin:0 0 12px}h3{font-size:16px;margin:0 0 12px}p{line-height:1.65;color:var(--muted)}.eyebrow{font-size:10px;letter-spacing:2px;font-weight:700;color:var(--blue)}.hero{background:#142941;border-radius:15px;color:white;display:grid;grid-template-columns:1.3fr 1fr;overflow:hidden;padding:36px 40px;margin-bottom:30px;position:relative}.hero p{color:#b8c8dc;max-width:530px;font-size:15px}.hero h1{font-size:42px;max-width:560px}.hero .eyebrow{color:#70dbc2}.hero-art{width:100%;height:245px}.pill{display:inline-block;border:1px solid #40566f;border-radius:20px;padding:6px 12px;font-size:11px;color:#b8d5e5;margin-right:6px}.btn{border:1px solid var(--line);border-radius:7px;background:white;padding:10px 15px;color:var(--ink);font-weight:600;font-size:12px}.btn.primary{background:var(--blue);border-color:var(--blue);color:white}.btn:hover{filter:brightness(.95)}.btn:disabled{opacity:.45;cursor:default}.section-head{display:flex;justify-content:space-between;align-items:center;margin:26px 0 16px}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:17px}.card{background:white;border:1px solid var(--line);border-radius:11px;padding:20px;text-decoration:none;color:inherit;transition:transform .2s,box-shadow .2s}.card:hover{transform:translateY(-3px);box-shadow:0 8px 25px #17263d0c}.card .icon{font:26px Georgia;color:var(--blue);background:#eef3fe;border-radius:10px;display:grid;place-items:center;width:46px;height:46px;margin-bottom:20px}.card p{font-size:12px;min-height:39px}.card small{color:var(--blue);font-weight:600}.tag{font-size:10px;padding:4px 8px;border-radius:5px;background:#eaf7f2;color:#21876a}.page-title{display:flex;justify-content:space-between;align-items:center;gap:16px}.page-title p{margin-top:0}.lab-grid{display:grid;grid-template-columns:260px minmax(0,1fr);gap:20px;align-items:start}.panel{background:white;border:1px solid var(--line);border-radius:11px;padding:22px}.control{display:block;margin:22px 0;font-size:12px;font-weight:600}.control .readout{float:right;color:var(--blue);font-variant-numeric:tabular-nums}.control input[type=range]{display:block;width:100%;margin:14px 0 0;accent-color:var(--blue)}.control select,.control input[type=number]{width:100%;margin-top:10px;padding:9px;border:1px solid var(--line);border-radius:6px}.hint{font-size:11px;line-height:1.6;color:var(--muted)}.plot-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.plot-header h3{margin:0}.plot-wrap{background:#f9fbfe;border:1px solid #edf0f5;border-radius:8px}.plot{display:block;width:100%;height:330px}.legend{display:flex;gap:18px;font-size:11px;color:var(--muted);margin:14px 0}.legend i{display:inline-block;width:16px;height:3px;margin-right:6px;vertical-align:middle}.metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:18px 0}.metric{padding:15px;background:#f5f7fb;border-radius:8px}.metric small{display:block;color:var(--muted);font-size:10px;margin-bottom:9px}.metric strong{font:600 21px 'Space Grotesk';display:block}.toolbar{display:flex;gap:8px;flex-wrap:wrap;margin:16px 0}.tabs{display:flex;gap:22px;border-bottom:1px solid var(--line);margin-top:28px}.tabs button{background:none;border:0;padding:12px 0;color:var(--muted)}.tabs button.active{border-bottom:2px solid var(--blue);color:var(--blue)}.theory{padding-top:22px;line-height:1.7}.equation{background:#eff3fa;border-left:3px solid var(--blue);padding:16px;font:17px Georgia;color:var(--ink);overflow-wrap:anywhere}.check{font-size:11px;background:#eaf7f2;color:#21876a;padding:10px;border-radius:6px;margin-top:15px}.circuit{overflow-x:auto;display:flex;gap:10px;padding:16px;background:#f6f8fc;min-height:90px;align-items:center}.gate-chip{padding:10px;background:#e8efff;border:1px solid #bdcff8;border-radius:7px;color:#245ce5;white-space:nowrap}.gate-chip small{display:block;font-size:9px;margin-top:5px}.gate-chip button{border:0;background:none;color:#637997;margin-left:5px}.table{width:100%;border-collapse:collapse;font-size:12px}.table th,.table td{text-align:left;padding:11px;border-bottom:1px solid var(--line)}.bar{height:7px;background:#e8eef7;border-radius:6px;width:100%;min-width:60px}.bar span{height:100%;display:block;background:var(--blue);border-radius:6px}.empty{padding:35px;text-align:center;color:var(--muted)}footer{margin:16px 36px 0;padding:22px 0;border-top:1px solid var(--line);display:flex;justify-content:space-between;font-size:10px;color:var(--muted)}#toast{position:fixed;bottom:24px;right:24px;background:#17263d;color:white;padding:13px 20px;border-radius:8px;display:none;z-index:5}button:focus-visible,a:focus-visible{outline:3px solid #31c7a2;outline-offset:3px}.note{background:#f0f4fb;padding:18px;border-radius:8px;margin-top:20px;font-size:12px}.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.theory ul{padding-left:20px;color:var(--muted)}
.model-diagram{background:#f5f8fd;border:1px solid var(--line);border-radius:8px;padding:16px;margin:20px 0}.model-diagram svg{width:100%;display:block}.model-diagram h4{margin:0 0 8px}.wire-scroll{overflow-x:auto;background:#f9fbfe;border:1px solid var(--line);border-radius:8px;margin-bottom:10px}.wire-scroll svg{display:block}.lesson h4{margin:24px 0 10px}.question{padding:18px;background:#f7f9fc;border:1px solid var(--line);border-radius:8px;margin:16px 0}.question h4{margin:0}.question textarea{display:block;width:100%;min-height:100px;border:1px solid #c8d4e5;border-radius:6px;padding:12px;font:inherit;resize:vertical}.solutions{margin-top:15px}.solutions summary{color:var(--blue);cursor:pointer;font-size:12px}.comparison-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:24px}.comparison-grid article{min-width:0}.comparison-plot{display:block;width:100%;height:240px}.comparison-grid p{overflow-wrap:anywhere}.panel:has(.table){overflow-x:auto}
@media(min-width:1400px){.lab-grid{grid-template-columns:290px minmax(0,1fr)}}@media(max-width:1100px){aside{width:195px;padding:25px 12px}.shell{margin-left:195px}main{padding:25px 22px}.lab-grid{grid-template-columns:220px minmax(0,1fr)}.cards{grid-template-columns:repeat(2,1fr)}.hero{padding:28px}.hero h1{font-size:34px}.metrics{gap:6px}.metric{padding:10px}}@media(max-width:760px){aside{position:relative;width:100%;height:auto;padding:15px}.brand{font-size:20px}.nav-label,.sidebar-bottom,nav .group{display:none}nav{display:flex;overflow:auto;margin-top:12px;gap:5px}nav a{white-space:nowrap;font-size:11px;padding:9px}.shell{margin-left:0}header{padding:15px;height:auto;gap:8px}header label{font-size:10px;gap:5px}header select{max-width:145px}main{padding:20px 15px}.hero{grid-template-columns:1fr;padding:25px}.hero-art{height:170px}.hero h1{font-size:32px}.lab-grid{grid-template-columns:1fr}.cards,.comparison-grid{grid-template-columns:1fr}.page-title{align-items:flex-start}.page-title h1{font-size:28px}.panel{padding:18px}.plot{height:280px}footer{margin:15px;display:block;line-height:1.8}footer span{display:block}.metrics strong{font-size:17px}}