:root{color-scheme:dark;--bg:#0b131e;--panel:#121f2e;--panel2:#172738;--line:#293c50;--ink:#edf4fa;--muted:#a9bbc9;--accent:#78e2bd;--gold:#f0c175;--danger:#ffafb0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:16px}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);line-height:1.6}a{color:var(--accent);text-underline-offset:4px}button,input,select{font:inherit}button,a,input,select{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:not-allowed}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--gold);outline-offset:4px}.skip{position:fixed;top:-100px;left:12px;background:var(--accent);color:var(--bg);padding:10px;z-index:10}.skip:focus{top:10px}.topbar{min-height:105px;padding:24px max(24px,calc((100vw - 1240px)/2));display:flex;align-items:center;gap:48px;border-bottom:1px solid var(--line);background:#101b29}.brand{display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none;font-size:.8rem;line-height:1.3;min-width:180px}.brand strong{font-size:1.05rem}.brand-mark{font-size:2.1rem;font-weight:800;letter-spacing:-3px;border:1px solid var(--line);border-radius:12px;padding:0 12px 4px}.brand-mark span{color:var(--accent)}nav{display:flex;gap:24px;flex-wrap:wrap}nav a{color:var(--muted);text-decoration:none;font-size:.9rem;padding:10px 0;border-bottom:2px solid transparent}nav a[aria-current]{color:var(--accent);border-color:var(--accent)}.local-badge{font-size:.73rem;color:var(--muted);margin-left:auto;white-space:nowrap}.local-badge span{display:inline-block;background:var(--accent);width:6px;height:6px;border-radius:50%;margin-right:7px}main{max-width:1240px;margin:auto;padding:48px 24px 64px;min-height:75vh}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(2rem,4vw,3.8rem);line-height:1.12;letter-spacing:-.05em;margin-bottom:24px;font-weight:650}h2{font-size:1.45rem;line-height:1.25;letter-spacing:-.025em}h3{font-size:1rem}p{color:var(--muted)}.eyebrow{font-family:ui-monospace,monospace;font-size:.73rem;text-transform:uppercase;letter-spacing:.16em;color:var(--accent);margin-bottom:16px}.hero{display:grid;grid-template-columns:1.15fr 1fr;gap:50px;align-items:center;padding:24px 0 48px}.hero p{max-width:540px;font-size:1.05rem}.hero em{color:var(--accent);font-style:normal}.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}.button,button.primary{border:1px solid var(--accent);background:var(--accent);color:#0b2522;padding:11px 18px;border-radius:7px;text-decoration:none;font-weight:650;display:inline-block}.button.secondary,button.secondary{background:transparent;color:var(--ink);border:1px solid var(--line);border-radius:7px;padding:10px 16px;text-decoration:none}.button:hover,button.primary:hover{filter:brightness(1.08)}.hero-board{background:linear-gradient(140deg,#182c3b,#10212b);border:1px solid #365448;border-radius:18px;position:relative;padding:32px;box-shadow:0 18px 65px #0003;transform:rotate(-2deg)}.hero-board:before,.hero-board:after{content:"";position:absolute;width:12px;height:12px;border:3px solid var(--gold);border-radius:50%;top:16px;left:16px}.hero-board:after{top:auto;left:auto;right:16px;bottom:16px}.hero-board svg{width:100%;display:block}.board-caption{display:flex;justify-content:space-between;color:var(--accent);font-family:ui-monospace,monospace;font-size:.7rem;margin-top:16px}.section-heading{display:flex;justify-content:space-between;gap:16px;align-items:end;margin:20px 0}.section-heading p{margin:0;font-size:.85rem}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.card{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:24px;position:relative}.card-link{display:block;text-decoration:none;color:var(--ink);transition:border-color .2s,transform .2s}.card-link:hover{border-color:var(--accent);transform:translateY(-3px)}.card p{font-size:.9rem;margin:0}.card .tag{color:var(--accent);font: .7rem ui-monospace,monospace;letter-spacing:.06em;display:block;margin-bottom:22px}.card .arrow{position:absolute;right:22px;top:20px;color:var(--muted)}.card h3{font-size:1.15rem;margin-bottom:8px}.strip{margin-top:28px;border:1px solid var(--line);border-left:3px solid var(--gold);background:#1c2530;padding:18px 22px;border-radius:6px;color:var(--muted);font-size:.85rem}.strip strong{color:var(--gold)}.page-intro{max-width:800px;margin-bottom:32px}.page-intro h1{font-size:2.5rem;margin-bottom:12px}.workspace{display:grid;grid-template-columns:245px minmax(0,1fr);gap:24px}.sidebar{align-self:start;position:sticky;top:20px}.sidebar a{display:block;color:var(--muted);padding:12px 16px;border-radius:6px;text-decoration:none;font-size:.9rem}.sidebar a[aria-current]{color:var(--accent);background:var(--panel2);box-shadow:inset 3px 0 var(--accent)}.sidebar small{display:block;color:var(--muted);font: .65rem ui-monospace,monospace;letter-spacing:.1em;padding:12px 16px}.tool-head{display:flex;align-items:start;justify-content:space-between;gap:20px;margin-bottom:24px}.tool-head h2{margin-bottom:8px}.tool-head p{margin:0;font-size:.9rem}.tool-id{border:1px solid var(--line);border-radius:5px;color:var(--accent);padding:5px 10px;font:.75rem ui-monospace,monospace;white-space:nowrap}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin:20px 0}label{display:block;color:var(--muted);font-size:.85rem}label>span{display:block;margin-bottom:6px}input,select{border:1px solid #3d5267;color:var(--ink);background:#0c1723;border-radius:6px;padding:10px 12px;min-width:0;width:100%;min-height:45px}input::placeholder{color:#8c9eae}.quantity{display:flex;gap:6px}.quantity input{width:65%}.quantity select{width:35%}.wide{grid-column:1/-1}.result{border:1px solid #315b50;background:#132d2c;border-radius:8px;padding:22px;margin-top:24px}.result:empty{display:none}.result .big{display:block;color:var(--accent);font:600 1.8rem ui-monospace,monospace;letter-spacing:-.04em;overflow-wrap:anywhere}.result p:last-child{margin-bottom:0}.result p{font-size:.9rem;color:#c4dcd3}.error{color:var(--danger);background:#361d29;border:1px solid #92515d;padding:14px;border-radius:6px;margin:18px 0}.error:empty{display:none}.explanation{margin-top:24px;border-top:1px solid var(--line);padding-top:22px;font-size:.9rem}.explanation h3{color:var(--ink)}.explanation p{margin-bottom:10px}.formula{display:block;background:#0b1723;padding:14px;border-radius:6px;color:var(--gold);font-family:ui-monospace,monospace;overflow-wrap:anywhere}.example{font-size:.85rem;margin-top:14px}.copy{font-size:.8rem;margin-top:12px}.muted{color:var(--muted);font-size:.85rem}.resistor{display:flex;justify-content:center;align-items:center;margin:28px auto;max-width:360px}.lead{height:4px;background:#a4b2bf;flex:1}.resistor-body{display:flex;align-items:stretch;gap:14px;justify-content:center;background:#dac49f;min-width:210px;height:62px;border-radius:22px;padding:0 25px;box-shadow:inset 0 -8px #0002}.band{width:13px;border-left:1px solid #0003;border-right:1px solid #0003}.band:last-child{margin-left:12px}.band-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px}.band-grid label{font-size:.75rem}.band-grid select{padding:10px 4px}.search{max-width:500px;margin-bottom:24px}.catalog-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:24px}.catalog-grid button{text-align:left;color:var(--ink)}.catalog-grid button[aria-pressed=true]{border-color:var(--accent);background:#18332f}.catalog-grid strong{display:block;font-size:1.05rem}.catalog-grid span{font-size:.75rem;color:var(--muted)}.ic-layout{display:grid;grid-template-columns:1fr 1fr;gap:28px}.chip-diagram{display:grid;grid-template-columns:1fr 70px 1fr;margin:30px 0 20px;gap:6px;position:relative}.chip-body{grid-column:2;grid-row:1 / span 7;background:#071018;border:2px solid #415368;border-radius:8px;position:relative;min-height:210px}.notch{position:absolute;border:2px solid #7e91a1;border-top:0;border-radius:0 0 20px 20px;width:28px;height:15px;top:-2px;left:19px}.chip-body:after{content:"TOP";position:absolute;top:50%;left:20px;color:#a1b2bf;font: .75rem ui-monospace,monospace;writing-mode:vertical-lr}.chip-pin{display:flex;gap:8px;align-items:center;font: .8rem ui-monospace,monospace;min-height:32px}.chip-pin.left{justify-content:end}.chip-pin b{background:#586b7c;padding:3px 6px;border-radius:3px;color:white}.chip-pin.first b{background:var(--gold);color:#19212b}table{border-collapse:collapse;width:100%;font-size:.85rem}td,th{text-align:left;padding:10px;border-bottom:1px solid var(--line)}th{color:var(--muted)}td:nth-child(2){font-family:ui-monospace,monospace}.source-line{font-size:.8rem;margin-top:18px;overflow-wrap:anywhere}.gpio-layout{display:grid;grid-template-columns:minmax(300px,1fr) minmax(0,1fr);gap:24px;align-items:start}.header-board{border:1px solid #385b4f;background:#122b28;border-radius:14px;padding:20px}.header-label{display:flex;justify-content:space-between;color:var(--accent);font:.7rem ui-monospace,monospace;margin-bottom:14px}.pin-header{display:grid;grid-template-columns:1fr 1fr;gap:4px 12px}.pin{display:flex;align-items:center;gap:8px;background:#0b1b1c;border:1px solid #324c48;color:var(--ink);border-radius:5px;padding:5px 8px;min-height:38px;font:.78rem ui-monospace,monospace;text-align:left}.pin:nth-child(odd){flex-direction:row-reverse;text-align:right}.pin b{display:flex;align-items:center;justify-content:center;width:25px;min-width:25px;height:25px;background:#2c6151;border:1px solid #7eb49f;border-radius:50%}.pin[data-kind=ground] b{background:#303b48;border-color:#9eaab7}.pin[data-kind="3v3"] b{background:#6a4923;border-color:var(--gold)}.pin[data-kind="5v"] b{background:#782f42;border-color:#ffb0b7}.pin[data-reserved=true] b{border-color:#b5a4ff;background:#524478}.pin[aria-pressed=true]{outline:2px solid white;outline-offset:0;background:#305347}.pin:first-child b{border-radius:3px}.legend{display:flex;flex-wrap:wrap;gap:12px;margin-top:14px;font:.7rem ui-monospace,monospace;color:var(--muted)}.legend span:before{content:"";display:inline-block;width:8px;height:8px;background:var(--accent);margin-right:5px}.legend .power:before{background:var(--gold)}.legend .ground:before{background:#9eaab7}.legend .reserved:before{background:#b5a4ff}.pin-detail{min-height:170px}.pin-detail h3{font-size:1.1rem}.pin-detail .big{font-size:1.7rem}.diagram{width:100%;max-height:150px;margin:16px 0;color:var(--accent)}details{margin:20px 0;border:1px solid var(--line);padding:16px;border-radius:8px}summary{cursor:pointer;color:var(--ink);font-weight:600}details p{margin-top:16px}pre{background:#09131e;padding:16px;overflow:auto;color:var(--accent);font-size:.85rem;border-radius:5px}.about{max-width:850px}.about h2{margin-top:32px}.about li{color:var(--muted);margin-bottom:12px}footer{border-top:1px solid var(--line);padding:24px max(24px,calc((100vw - 1192px)/2));display:flex;gap:24px;flex-wrap:wrap;color:var(--muted);font-size:.75rem}footer span{margin-right:auto}[hidden]{display:none!important}
@media(max-width:1000px){.topbar{gap:24px}.local-badge{display:none}.workspace{grid-template-columns:200px 1fr}.hero{gap:24px}.ic-layout{grid-template-columns:1fr}.gpio-layout{grid-template-columns:1fr 1fr}.band-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:720px){.topbar{padding:18px 20px;display:block}.brand{margin-bottom:14px}nav{justify-content:space-between;gap:10px}nav a{font-size:.8rem}main{padding:28px 18px 40px}.hero{grid-template-columns:1fr;padding-top:0;gap:30px}.hero-board{max-width:430px;width:100%;justify-self:center}.cards,.catalog-grid{grid-template-columns:1fr}.section-heading{display:block}.section-heading p{margin-top:8px}.workspace,.gpio-layout{grid-template-columns:1fr}.sidebar{position:static;display:flex;overflow-x:auto;gap:8px;padding-bottom:8px}.sidebar small{display:none}.sidebar a{white-space:nowrap;font-size:.8rem;border:1px solid var(--line);padding:8px 12px}.sidebar a[aria-current]{box-shadow:none;border-color:var(--accent)}.card{padding:20px}.form-grid{grid-template-columns:1fr}.tool-head{gap:10px}.tool-id{display:none}.page-intro h1{font-size:2.1rem}.band-grid{grid-template-columns:repeat(2,1fr)}.ic-layout{gap:12px}.result .big{font-size:1.5rem}footer{padding:20px;gap:14px}.pin{min-height:40px}h1{font-size:2.6rem}}
.ethernet-plug{max-width:400px;margin:24px auto;text-align:center;border:2px solid #8094a7;border-radius:14px 14px 35px 35px;background:#203243;padding:20px 16px}.plug-nose,.plug-latch,.plug-cable{font:.7rem ui-monospace,monospace;color:var(--muted);letter-spacing:.04em}.plug-nose{color:var(--gold);margin-bottom:18px}.plug-contacts{display:grid;grid-template-columns:repeat(8,1fr);gap:8px}.wire-contact b{display:block;color:var(--gold);font:600 1rem ui-monospace,monospace;margin-bottom:8px}.wire{display:block;background:var(--wire);height:105px;border:2px solid #e1c16a;border-top-width:22px;border-radius:3px}.striped{background:repeating-linear-gradient(135deg,#fff 0px,#fff 7px,var(--wire) 7px,var(--wire) 14px)}.plug-latch{margin:22px 0;border:1px dashed #8293a4;border-radius:6px;padding:10px}.plug-cable{padding:18px 4px 5px}.wire-swatch{display:inline-block;width:15px;height:20px;background:var(--wire);border:1px solid #b6c6d1;border-radius:3px;vertical-align:middle;margin-right:8px}.wire-swatch.striped{background:repeating-linear-gradient(135deg,#fff 0px,#fff 4px,var(--wire) 4px,var(--wire) 8px)}#wire-table td{font-family:inherit}.binary{display:block;color:var(--gold);font: .9rem ui-monospace,monospace;overflow-wrap:anywhere;letter-spacing:.015em}#subnet-result td{overflow-wrap:anywhere}#subnet-result th{width:45%}#subnet-result p{margin-top:18px}
@media(max-width:1200px){.topbar{flex-wrap:wrap;gap:14px 24px}.local-badge{display:none}}
@media(max-width:720px){nav{justify-content:flex-start;gap:4px 18px}.plug-contacts{gap:5px}.ethernet-plug{padding:18px 10px}.wire{height:90px}.plug-nose,.plug-latch,.plug-cable{font-size:.65rem}#wire-table th,#wire-table td{padding:9px 5px}#wire-table td{font-size:.78rem}#subnet-result{padding:14px}#subnet-result th,#subnet-result td{padding:10px 4px;font-size:.8rem}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}