:root{--bg:#fbf6ee;--ink:#231f1c;--mute:#6b625a;--terra:#d9573b;--teal:#0f766e;--sand:#f1e7d6;--card:#fffdf9}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.65 "Segoe UI",system-ui,-apple-system,Roboto,Helvetica,Arial,sans-serif}
a{color:inherit}
.top{position:sticky;top:0;z-index:5;display:flex;justify-content:space-between;align-items:center;padding:10px 20px;background:rgba(251,246,238,.92);backdrop-filter:blur(8px);border-bottom:1px solid #eadfcb}
.logo{font:700 26px Georgia,serif;text-decoration:none;color:var(--terra)}
.top nav{display:flex;gap:4px}.top nav a{padding:10px 12px;text-decoration:none;font-size:15px;color:var(--mute);border-radius:8px}.top nav a:hover{background:var(--sand);color:var(--ink)}
main{max-width:1040px;margin:0 auto;padding:0 20px}
.hero{display:grid;gap:24px;padding:44px 0 24px;align-items:center}
.eyebrow{display:inline-block;margin:0 0 14px;padding:6px 14px;border-radius:99px;background:#d9f0ea;color:var(--teal);font-weight:600;font-size:14px;letter-spacing:.04em}
h1{font:700 clamp(44px,11vw,88px)/1 Georgia,"Times New Roman",serif;margin:0 0 18px;letter-spacing:-.02em}
h1 span{color:var(--terra);font-style:italic}
.lead{font-size:19px;color:var(--mute);max-width:520px;margin:0 0 24px}
.cta{display:flex;flex-wrap:wrap;gap:12px}
.btn{display:inline-flex;align-items:center;min-height:48px;padding:0 24px;border-radius:99px;border:2px solid var(--ink);text-decoration:none;font-weight:600;transition:transform .15s}
.btn:hover{transform:translateY(-2px)}.btn.primary{background:var(--ink);color:#fff}.btn.big{font-size:18px;word-break:break-all;background:#fff;color:var(--ink);border-color:#fff}
.hero-art{background:linear-gradient(135deg,#ffe3c2,#ffc9b0 55%,#bfeadf);border-radius:32px;padding:20px;text-align:center}
.hero-art svg{width:100%;max-width:320px}
.ring{fill:rgba(255,255,255,.55)}.wheel{fill:#fff;stroke:var(--ink);stroke-width:5}.spoke{stroke:var(--terra);stroke-width:6;stroke-linecap:round}
.body{fill:var(--teal)}.ground{fill:#fff;stroke:var(--ink);stroke-width:6}.hub{fill:var(--terra)}.led{fill:#ffe08a}
.spin{transform-box:fill-box;transform-origin:center;animation:sp 6s linear infinite}.s2{animation-direction:reverse}
@keyframes sp{to{transform:rotate(360deg)}}@media (prefers-reduced-motion:reduce){.spin{animation:none}}
.cap{margin:8px 0 0;font-size:13px;color:var(--mute)}
.stats{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:20px 0 8px}
.stats div{background:var(--card);border:1px solid #eadfcb;border-radius:18px;padding:16px}
.stats b{display:block;font:700 28px Georgia,serif;color:var(--terra)}.stats span{font-size:14px;color:var(--mute)}
.block{padding:44px 0 4px}
h2{font:700 clamp(28px,6vw,40px) Georgia,serif;margin:0 0 20px}h2 i{font:600 15px "Segoe UI",sans-serif;color:var(--teal);background:#d9f0ea;border-radius:8px;padding:3px 9px;margin-right:12px;vertical-align:middle;font-style:normal}
.card{background:var(--card);border:1px solid #eadfcb;border-radius:24px;padding:24px;margin-bottom:16px;box-shadow:0 8px 24px rgba(120,90,50,.07)}
.card.big{border-top:6px solid var(--terra)}
h3{font:700 22px Georgia,serif;margin:0 0 4px}.meta{color:var(--teal);font-size:14px;font-weight:600;margin:0 0 12px}
.card ul{padding-left:20px;margin:12px 0}.card li{margin:6px 0}
.note{background:var(--sand);border-radius:12px;padding:10px 14px;font-size:15px;color:var(--mute);margin:14px 0 0}
.flow{display:grid;gap:8px;margin:20px 0;align-items:stretch}
.flow span{text-align:center;color:var(--terra);font-weight:700;transform:rotate(90deg);height:22px;line-height:22px}
.node{background:#fff;border:2px solid var(--ink);border-radius:16px;padding:12px 16px;font-weight:700}.node small{display:block;font-weight:400;color:var(--mute);font-size:14px}
.node.hl{background:var(--teal);color:#fff;border-color:var(--teal)}.node.hl small{color:#d9f0ea}
.grid2{display:grid;gap:16px}
.chips{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:20px}
.chips span{padding:9px 16px;border-radius:99px;font-weight:600;font-size:15px;background:#d9f0ea;color:#0b5a53}
.chips span:nth-child(3n){background:#fde3c8;color:#8a4b08}.chips span:nth-child(3n+1){background:#fbd9cf;color:#9a3412}
.contact{margin:56px -20px 0;padding:56px 20px;background:var(--terra);color:#fff;text-align:center}
.contact h2{margin-bottom:8px}.contact p{margin:0 0 22px}
footer{text-align:center;padding:24px;color:var(--mute);font-size:14px}
@media(min-width:760px){
.hero{grid-template-columns:1.2fr 1fr;padding-top:72px}.stats{grid-template-columns:repeat(4,1fr)}
.flow{grid-template-columns:repeat(4,1fr)}.flow span{display:none}
.grid2{grid-template-columns:1fr 1fr}
}
@media(max-width:480px){.top nav a{padding:10px 8px;font-size:14px}.contact{margin:56px -20px 0}}
.demo{margin:20px 0 0}.demo video{width:100%;border-radius:18px;background:#000;display:block;max-height:560px}.demo figcaption{font-size:14px;color:var(--mute);margin-top:8px}
.hero-art img{width:100%;height:auto;border-radius:20px;display:block}
.hero-art .cap{margin:10px 0 0}
.shot{margin:20px 0 0;text-align:center}.shot img{max-width:100%;max-height:520px;width:auto;border-radius:16px}
.gallery{display:grid;gap:16px;margin-top:20px;grid-template-columns:1fr}
.gallery figure{margin:0;text-align:center}.gallery img{width:100%;height:340px;object-fit:cover;border-radius:16px}
.gallery figcaption{font-size:.9rem;color:#6b6257;margin-top:6px}
@media(min-width:700px){.gallery{grid-template-columns:1fr 1fr}}

details.code{margin-top:14px}details.code summary{cursor:pointer;font-weight:700;color:var(--teal)}
details.code pre{background:#231f1c;color:#f6efe3;border-radius:14px;padding:16px;overflow:auto;max-height:520px;font-size:.82rem;line-height:1.5}
.diagrams{display:grid;gap:16px;margin-top:20px;grid-template-columns:1fr}.diagrams figure{margin:0;text-align:center}.diagrams img{width:100%;height:auto;border-radius:16px;background:#fff;border:1px solid #eadfcb}.diagrams figcaption{font-size:.9rem;color:#6b6257;margin-top:6px}
@media(min-width:700px){.diagrams{grid-template-columns:1fr 1fr}}
.explain h4{margin:18px 0 6px;font-size:1.05rem}.explain ul{padding-left:20px}.explain li{margin:8px 0}
.shots{display:grid;grid-template-columns:1fr;gap:12px;margin:10px 0}.shots figure{margin:0}.shots img{width:100%;max-width:340px;display:block;margin:0 auto;border-radius:14px;border:1px solid #eadfcb}@media(min-width:800px){.shots{grid-template-columns:repeat(3,1fr)}}

/* ===== redesign v2 ===== */
:root{--bg:#fff7ec;--peach:#ffd9b8;--coral:#f0623f;--terra:#e0502f;--teal:#0e8a7d;--mint:#c4efe2;--sun:#ffc24a;--card:rgba(255,255,255,.78);--ink:#2a211c;--mute:#74665c}
body{background:
 radial-gradient(900px 600px at 8% -5%,#ffd9b8 0,transparent 60%),
 radial-gradient(800px 600px at 105% 12%,#c4efe2 0,transparent 55%),
 radial-gradient(900px 700px at 40% 55%,#ffe9c9 0,transparent 60%),
 radial-gradient(700px 600px at 100% 85%,#ffd0c2 0,transparent 60%),
 var(--bg);background-attachment:fixed;position:relative}
body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.5;background-image:radial-gradient(rgba(120,80,40,.16) 1.2px,transparent 1.3px);background-size:26px 26px;-webkit-mask-image:linear-gradient(180deg,#000,transparent 85%);mask-image:linear-gradient(180deg,#000,transparent 85%)}
.top{margin:12px auto 0;max-width:1040px;width:calc(100% - 24px);border:1px solid rgba(255,255,255,.9);border-radius:99px;background:rgba(255,255,255,.7);backdrop-filter:blur(14px);box-shadow:0 10px 30px rgba(150,90,40,.12);padding:6px 10px 6px 18px;top:10px}
.logo{background:linear-gradient(135deg,var(--coral),var(--sun));-webkit-background-clip:text;background-clip:text;color:transparent}
.top nav a{border-radius:99px;font-weight:600}.top nav a:hover{background:linear-gradient(135deg,#ffe3c8,#c4efe2);color:var(--ink)}
.hero{position:relative;padding-top:56px}
.hero::before{content:"";position:absolute;width:340px;height:340px;right:-90px;top:10px;border-radius:50%;background:conic-gradient(from 180deg,var(--sun),var(--coral),#ff9db0,var(--mint),var(--sun));filter:blur(46px);opacity:.55;z-index:-1;animation:drift 14s ease-in-out infinite alternate}
@keyframes drift{to{transform:translate(-40px,40px) rotate(60deg)}}
.eyebrow{background:#fff;border:1px solid #ffd9b8;color:var(--teal);box-shadow:0 4px 14px rgba(224,80,47,.12)}
.eyebrow::before{content:"";display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--teal);margin-right:8px;box-shadow:0 0 0 4px rgba(14,138,125,.18);animation:pulse 2s infinite}
@keyframes pulse{50%{box-shadow:0 0 0 8px rgba(14,138,125,0)}}
h1{letter-spacing:-.035em;font-size:clamp(46px,11vw,96px)}
h1 span{background:linear-gradient(100deg,var(--coral) 10%,#ff8a5c 50%,var(--sun));-webkit-background-clip:text;background-clip:text;color:transparent;padding-right:.08em}
.lead{font-size:20px}
.btn{border:0;box-shadow:0 8px 22px rgba(42,33,28,.15);transition:transform .2s,box-shadow .2s}
.btn:hover{transform:translateY(-3px);box-shadow:0 14px 28px rgba(42,33,28,.2)}
.btn.primary{background:linear-gradient(135deg,var(--coral),#ff8a5c);color:#fff}
.btn:not(.primary):not(.big){background:#fff;color:var(--ink)}
.hero-art{position:relative;background:linear-gradient(145deg,#ffe0c2,#ffc6b0 55%,#b9ecdd);padding:16px;border-radius:36px;border:6px solid #fff;box-shadow:0 30px 60px rgba(224,80,47,.22),0 0 0 1px #ffd9b8;transform:rotate(1.6deg);transition:transform .4s}
.hero-art:hover{transform:rotate(0) scale(1.01)}
.hero-art::after{content:"ESP32 + PID";position:absolute;left:-14px;bottom:60px;background:var(--teal);color:#fff;font-weight:700;font-size:13px;padding:8px 14px;border-radius:99px;transform:rotate(-6deg);box-shadow:0 8px 18px rgba(14,138,125,.35)}
.hero-art img{border-radius:24px}
.stats div{background:var(--card);backdrop-filter:blur(8px);border:1px solid #fff;border-radius:22px;box-shadow:0 10px 26px rgba(150,90,40,.1);transition:transform .25s}
.stats div:hover{transform:translateY(-4px) rotate(-.6deg)}
.stats b{background:linear-gradient(135deg,var(--coral),var(--sun));-webkit-background-clip:text;background-clip:text;color:transparent}
h2{display:flex;align-items:center;gap:12px;position:relative}
h2::after{content:"";flex:1;height:2px;margin-left:8px;background:linear-gradient(90deg,#f0b48f,transparent);border-radius:2px}
h2 i{background:linear-gradient(135deg,var(--teal),#35c1ae);color:#fff;border-radius:99px;padding:5px 12px;box-shadow:0 6px 14px rgba(14,138,125,.3)}
.card{background:var(--card);backdrop-filter:blur(10px);border:1px solid #fff;border-radius:30px;box-shadow:0 18px 44px rgba(150,90,40,.12);transition:transform .3s,box-shadow .3s}
.card:hover{box-shadow:0 24px 54px rgba(150,90,40,.18)}
.grid2 .card:hover{transform:translateY(-4px)}
.card.big{border-top:0;position:relative;overflow:hidden}
.card.big::before{content:"";position:absolute;left:0;right:0;top:0;height:8px;background:linear-gradient(90deg,var(--coral),var(--sun),var(--teal),#35c1ae)}
.node{border:2px solid var(--ink);border-radius:18px;box-shadow:4px 4px 0 var(--sun)}
.node.hl{background:linear-gradient(135deg,var(--teal),#35c1ae);border-color:var(--teal);box-shadow:4px 4px 0 var(--coral)}
.chips span{box-shadow:0 4px 10px rgba(150,90,40,.1);transition:transform .2s}.chips span:hover{transform:translateY(-3px) rotate(-2deg)}
.gallery img,.demo video,.diagrams img{border-radius:22px;box-shadow:0 14px 34px rgba(150,90,40,.2);border:4px solid #fff}
.demo video{border-color:#fff}
.shots img{border:4px solid #fff;box-shadow:0 14px 34px rgba(150,90,40,.22)}
.note{background:linear-gradient(135deg,#fff1dc,#e3f7f0)}
details.code summary{display:inline-block;padding:10px 18px;border-radius:99px;background:linear-gradient(135deg,#ffe3c8,#c4efe2);color:#0a5f56}
details.code pre{background:#2a211c;border-radius:20px;box-shadow:inset 0 0 0 1px rgba(255,255,255,.08)}
.contact{margin:64px -20px 0;background:linear-gradient(135deg,var(--coral),#ff8a5c 55%,var(--sun));position:relative;overflow:hidden}
.contact::before,.contact::after{content:"";position:absolute;border-radius:50%;background:rgba(255,255,255,.18)}
.contact::before{width:260px;height:260px;left:-80px;top:-100px}.contact::after{width:200px;height:200px;right:-60px;bottom:-90px}
.contact>*{position:relative}
.btn.big{background:#fff;color:var(--coral);box-shadow:0 14px 30px rgba(0,0,0,.18)}
@media(min-width:1100px){.contact{margin-left:calc(50% - 50vw);margin-right:calc(50% - 50vw);padding-left:20px;padding-right:20px;border-radius:0}}
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}.reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}.hero::before,.eyebrow::before{animation:none}}
@media(max-width:480px){.hero-art::after{left:-6px;bottom:50px}.top{border-radius:22px}}
@media(max-width:480px){.top{padding:4px 6px 4px 12px}.top nav{gap:0}.top nav a{padding:9px 6px;font-size:12.5px}.logo{font-size:22px;margin-right:2px}}
html{overflow-x:hidden}body{overflow-x:clip}
.contact h2{justify-content:center}.contact h2::after{display:none}
@media(max-width:480px){.contact .btn.big{font-size:15px;padding:16px 14px;word-break:normal;white-space:nowrap}}
.codeparts .part:nth-child(1) img{width:467px}.codeparts .part:nth-child(2) img{width:300px}.codeparts .part:nth-child(3) img{width:422px}.codeparts .part:nth-child(4) img{width:738px}.codeparts .part:nth-child(5) img{width:738px}.codeparts .part:nth-child(6) img{width:304px}.codeparts .part:nth-child(7) img{width:810px}.codeparts .part:nth-child(8) img{width:300px}.codeparts .part:nth-child(9) img{width:322px}
.codeparts{display:grid;grid-template-columns:minmax(0,1fr);gap:26px;margin-top:14px}
.codeparts .part{min-width:0;margin:0;background:rgba(255,255,255,.7);border:1px solid rgba(214,130,90,.25);border-radius:20px;padding:16px;box-shadow:0 10px 30px rgba(214,110,60,.10)}
.codeparts h5{font-size:1.05rem;margin:0 0 10px;color:#0e7d73}
.codeparts .cshot{overflow:auto;max-height:560px;border-radius:14px;border:1px solid rgba(214,130,90,.3);background:#fffaf2}
.codeparts img{display:block;max-width:none;height:auto}
.codeparts figcaption{margin-top:12px;line-height:1.55}

.who{display:flex;align-items:center;gap:22px;margin-bottom:6px}
.portrait{width:132px;height:176px;object-fit:cover;border-radius:28px;border:5px solid #fff;box-shadow:0 18px 40px rgba(224,80,47,.25);transform:rotate(-3deg);flex:none}
@media(max-width:480px){.who{gap:14px}.portrait{width:96px;height:128px;border-radius:22px;border-width:4px}}
.codeparts .cshot img{max-height:none;border-radius:0}

.cbar{display:flex;align-items:center;gap:7px;background:#f8e6d3;padding:10px 14px;border-radius:14px 14px 0 0;border:1px solid rgba(214,130,90,.3);border-bottom:0;font:12px/1 monospace;color:#785f50}
.cbar i{width:11px;height:11px;border-radius:50%;background:#ec6a50;flex:none}.cbar i:nth-child(2){background:#fab946}.cbar i:nth-child(3){background:#3caa96;margin-right:8px}
.cbar span{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.codeparts .cshot{border-radius:0 0 14px 14px}