:root{--ink:#0f172a;--ink2:#334155;--mut:#64748b;--line:#e2e8f0;--bg:#f8fafc;--card:#fff;--acc:#f59e0b;--acc2:#0f766e;--ok:#16a34a;--bad:#dc2626;--warn:#d97706;--r:14px}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;color:var(--ink);background:var(--bg)}
a{color:var(--acc2)}img,svg{max-width:100%}
.top{display:flex;align-items:center;gap:16px;padding:12px 20px;background:var(--ink);color:#fff;position:sticky;top:0;z-index:5}
.top nav{display:flex;gap:16px;margin-left:auto;flex-wrap:wrap}.top nav a{color:#cbd5e1;text-decoration:none;font-size:15px}.top nav a:hover{color:#fff}
.logo{color:#fff;text-decoration:none;font-weight:800;font-size:20px;letter-spacing:-.3px}.logo span{color:var(--acc)}
main{max-width:1080px;margin:0 auto;padding:20px}
footer{border-top:1px solid var(--line);color:var(--mut);text-align:center;padding:24px 16px;font-size:14px}
.hero{padding:44px 0 18px;text-align:center}
.hero h1{font-size:clamp(28px,5vw,46px);line-height:1.15;margin:0 0 12px;letter-spacing:-.8px}
.hero h1 em{font-style:normal;color:var(--acc2)}
.hero p{color:var(--ink2);font-size:18px;max-width:720px;margin:0 auto 22px}
.search{display:flex;gap:8px;max-width:760px;margin:0 auto;background:#fff;border:2px solid var(--ink);border-radius:18px;padding:6px;box-shadow:0 10px 30px -12px rgba(15,23,42,.35)}
.search input,.search textarea{flex:1;border:0;outline:0;font:inherit;font-size:18px;padding:10px 12px;background:transparent;min-width:0;resize:vertical}
.search.big{flex-direction:column;border-radius:16px;padding:10px}.search.big .row{display:flex;gap:8px}.search.big .row input{border:1px solid var(--line);border-radius:10px;font-size:15px}
.btn{display:inline-flex;align-items:center;gap:6px;background:var(--ink);color:#fff;border:0;border-radius:12px;padding:11px 18px;font:inherit;font-weight:650;cursor:pointer;text-decoration:none;white-space:nowrap}
.btn:hover{background:#1e293b}.btn.ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}.btn.ghost:hover{background:#f1f5f9}
.chips{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin:16px auto 0;max-width:820px}
.chip{border:1px solid var(--line);background:#fff;border-radius:999px;padding:6px 14px;font:inherit;font-size:14px;cursor:pointer;color:var(--ink2)}
.chip:hover,.chip.on{border-color:var(--ink);color:var(--ink);background:#fff7e6}
.trust{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;margin:34px 0}
.trust div{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:16px}.trust b{display:block;font-size:17px;margin-bottom:4px}.trust p{margin:0;color:var(--ink2);font-size:14px}
.rh{margin:26px 0 10px;font-size:22px}.rh small{font-size:13px;color:var(--ok);font-weight:600;margin-left:6px}.rh2{margin:22px 0 10px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:14px}.grid.best{grid-template-columns:1fr}
.card{display:block;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:16px 18px;text-decoration:none;color:inherit;transition:.15s}
.card:hover{border-color:var(--ink);transform:translateY(-2px);box-shadow:0 8px 22px -14px rgba(15,23,42,.5)}
.card h3{margin:2px 0 6px;font-size:18px;line-height:1.3}.card p{margin:0 0 10px;color:var(--ink2);font-size:14.5px}
.card-cat{font-size:12px;text-transform:uppercase;letter-spacing:.6px;color:var(--acc2);font-weight:700}
.meta{display:flex;flex-wrap:wrap;gap:6px 12px;font-size:13px;color:var(--mut)}.ok-pill{color:var(--ok);font-weight:700}
.ai-cta{display:flex;gap:14px;align-items:center;justify-content:space-between;background:#fff7e6;border:1px dashed var(--acc);border-radius:var(--r);padding:14px 16px;margin:22px 0}
.ai-cta.big{padding:22px;font-size:17px}
.alert{border-radius:12px;padding:12px 14px;margin:14px 0}.alert.bad{background:#fef2f2;border:1px solid #fecaca}.alert.warn{background:#fffbeb;border:1px solid #fde68a}.alert.info{background:#eff6ff;border:1px solid #bfdbfe}
.alert ul{margin:6px 0 0;padding-left:20px}
.crumbs{font-size:14px;color:var(--mut)}.crumbs a{color:var(--mut)}
.circuit h1{font-size:clamp(26px,4vw,36px);line-height:1.2;margin:8px 0 8px;letter-spacing:-.5px}.lead{font-size:18px;color:var(--ink2);margin:0 0 12px}
.badges{display:flex;flex-wrap:wrap;gap:8px}.badges span{background:#fff;border:1px solid var(--line);border-radius:999px;padding:4px 12px;font-size:14px}
.toc{display:flex;flex-wrap:wrap;gap:6px 14px;align-items:center;margin:16px 0;padding:10px 0;border-bottom:1px solid var(--line);position:sticky;top:56px;background:var(--bg);z-index:3}
.toc a{text-decoration:none;font-size:14.5px;color:var(--ink2)}.toc .btn{margin-left:auto;padding:6px 12px;font-size:14px}
section{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:16px 18px;margin:16px 0;scroll-margin-top:110px}
section h2{margin:0 0 10px;font-size:21px}
.verify{border:2px solid #bbf7d0;background:#f0fdf4}.verify.ai{border-color:#fde68a;background:#fffbeb}
.vgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:10px;margin-bottom:8px}
.vbox{background:#fff;border-radius:12px;padding:10px 12px;border-left:5px solid var(--mut);display:flex;flex-direction:column}
.vbox.ok{border-color:var(--ok)}.vbox.bad{border-color:var(--bad)}.vbox.wait{border-color:var(--warn)}.vbox span{font-weight:650}.vbox small{color:var(--mut);font-size:12.5px}
.checks{margin:4px 0 10px;padding-left:0;list-style:none;font-size:14px}.checks li{padding:3px 0 3px 22px;position:relative}
.checks li:before{position:absolute;left:0}.checks .pass:before{content:"✔";color:var(--ok)}.checks .warn:before{content:"!";color:var(--warn);font-weight:800;left:5px}.checks .error:before{content:"✖";color:var(--bad)}
.warns{font-size:14px;margin-top:8px}.warns ul{margin:4px 0;padding-left:20px}
details summary{cursor:pointer;font-weight:600}details{margin:6px 0}
.diagram-wrap{overflow:auto;border:1px solid var(--line);border-radius:12px;background:#fff;-webkit-overflow-scrolling:touch}
.diagram{display:block;min-width:640px;width:100%;height:auto}.diagram .net{transition:opacity .2s}
table{width:100%;border-collapse:collapse;font-size:14.5px;margin-top:10px}th,td{text-align:left;padding:8px;border-bottom:1px solid var(--line);vertical-align:top}th{font-size:13px;color:var(--mut);font-weight:650}
.wires tr{cursor:pointer}.wires tr.hl{background:#fff7e6}.sw{display:inline-block;width:14px;height:14px;border-radius:4px;margin-right:6px;vertical-align:-2px;border:1px solid rgba(0,0,0,.15)}
.arr{color:var(--mut)}.bom .total td{font-weight:700;border-bottom:0}.buy{font-size:13px;white-space:nowrap}
.steps{padding-left:0;list-style:none;counter-reset:s}.steps li{counter-increment:s;margin:8px 0;border:1px solid var(--line);border-radius:12px;padding:10px 12px}
.steps label{display:flex;gap:10px;cursor:pointer}.steps input{width:20px;height:20px;margin-top:3px;flex:none}.steps b:before{content:counter(s) ". "}
.steps li:has(input:checked){background:#f0fdf4;border-color:#bbf7d0}
.progress{height:8px;background:#e2e8f0;border-radius:99px;overflow:hidden}.progress div{height:100%;width:0;background:var(--ok);transition:width .3s}
.code{background:#0b1220;color:#e2e8f0;border-radius:12px;padding:14px;overflow:auto;max-height:520px;font:13px/1.5 ui-monospace,Consolas,monospace}
.code-actions{display:flex;gap:8px;margin:8px 0}.muted{color:var(--mut)}.mono{font-family:ui-monospace,Consolas,monospace}
.safety{background:#fff7ed;border-color:#fed7aa}
.stages{list-style:none;padding:0;max-width:760px;margin:18px auto}.stages li{padding:8px 12px 8px 36px;position:relative;color:var(--mut)}
.stages li:before{content:"○";position:absolute;left:12px}.stages li.run{color:var(--ink);font-weight:650}.stages li.run:before{content:"◌";animation:spin 1s linear infinite;display:inline-block}
.stages li.ok{color:var(--ok)}.stages li.ok:before{content:"✔"}.stages li.bad{color:var(--bad)}.stages li.bad:before{content:"✖"}
@keyframes spin{to{transform:rotate(360deg)}}
.plans{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px}.plan{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:18px}
.plan.hot{border:2px solid var(--acc)}.plan .price{font-size:28px;font-weight:800}.paybox{display:flex;gap:18px;flex-wrap:wrap;align-items:center;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:16px;margin-top:16px}
.filters{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0 16px}
.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);background:var(--ink);color:#fff;padding:10px 16px;border-radius:12px;z-index:50}
@media (max-width:640px){main{padding:12px}.top{padding:10px 12px;flex-wrap:wrap;gap:6px}.logo{font-size:18px}.top nav{gap:12px;margin-left:0;width:100%}.top nav a{font-size:13.5px}.ai-cta{flex-direction:column;align-items:flex-start}.toc{top:0;position:static}.search input{font-size:16px}}
@media print{.top,footer,.toc,.code-actions,.ai-cta,.buy,.btn,#dform,#dprog{display:none!important}section{break-inside:avoid;border:0;padding:0}body{background:#fff}.code{max-height:none;white-space:pre-wrap;background:#fff;color:#000;border:1px solid #ccc}.diagram{min-width:0}}