:root{--navy:#071a35;--blue:#1769db;--cyan:#22b8cf;--green:#18a77b;--purple:#6b54d9;--ink:#102746;--muted:#5d718e;--line:#d7e3f2;--soft:#edf5fc;--white:#fff;--danger:#b33a32;--shadow:0 18px 45px rgba(20,43,76,.13)}
*{box-sizing:border-box}body{margin:0;background:#f2f7fb;color:var(--ink);font-family:Inter,Segoe UI,Arial,sans-serif}button,select{font:inherit}.hero{min-height:270px;padding:48px max(5vw,28px);display:flex;align-items:center;justify-content:space-between;gap:35px;color:white;background:linear-gradient(110deg,#06162e 0%,#082b58 62%,#0b5270 100%)}.hero>div:first-child{max-width:760px}.eyebrow{margin:0 0 10px;color:#2492ff;font-size:.78rem;font-weight:800;letter-spacing:.16em}.hero .eyebrow{color:#55dcea}.hero h1{font-size:clamp(2.1rem,5vw,4.25rem);line-height:1.02;margin:0 0 20px}.hero p:last-child{font-size:1.15rem;line-height:1.55;color:#c9ddf7}.hero-visual{display:flex;align-items:center;gap:14px;font-size:2rem}.gate-symbol{display:grid;place-items:center;width:125px;height:90px;border:4px solid #8ee7ff;border-radius:18px 50px 50px 18px;color:#8ee7ff;font-size:3rem;box-shadow:0 0 35px #168ccf88}.pulse{color:#5affbd;text-shadow:0 0 18px #5affbd}main{max-width:1380px;margin:auto;padding:28px}.phase-nav{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:-58px 0 34px;position:relative}.phase{min-height:112px;border:0;border-radius:16px;background:#fff;color:var(--ink);box-shadow:var(--shadow);display:grid;grid-template-columns:44px 1fr;grid-template-rows:1fr 1fr;text-align:left;padding:20px;cursor:pointer}.phase span{grid-row:1/3;align-self:center;display:grid;place-items:center;width:36px;height:36px;border-radius:10px;background:var(--soft);font-weight:800}.phase strong{font-size:1.08rem}.phase small{color:var(--muted)}.phase.active{color:white;background:linear-gradient(135deg,#1769db,#6053d7)}.phase.active small{color:#e7efff}.phase.active span{background:#ffffff25}.phase:disabled{opacity:.58;cursor:not-allowed}.panel{display:none}.panel.active{display:block}.section-title{display:flex;justify-content:space-between;align-items:end;margin:24px 0 18px}.section-title h2{margin:0;font-size:2rem}.quiet{background:transparent;border:1px solid #abc5e7;color:#164c91;border-radius:10px;padding:10px 16px}.build-layout{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(290px,.75fr);gap:22px}.bench,.tutor,.logic-console,.physical-view,.truth-card,.practice-card{background:white;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow)}.bench{padding:20px}.gate-picker{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:16px}.gate-choice{border:1px solid var(--line);background:#f7faff;border-radius:12px;padding:10px;display:flex;align-items:center;gap:8px;font-weight:800}.gate-choice em{margin-left:auto;font-size:.75rem;color:var(--muted);font-style:normal}.gate-choice.selected{border-color:var(--blue);background:#eaf3ff;color:#084caa}.mini-gate{display:grid;place-items:center;width:30px;height:26px;background:var(--navy);color:#fff;border-radius:5px 13px 13px 5px}.breadboard{position:relative;min-height:390px;overflow:hidden;border-radius:16px;background:#efe7ce;box-shadow:inset 0 0 35px #8b795c55}.holes{position:absolute;inset:34px 16px;background-image:radial-gradient(#665f52 2px,transparent 3px);background-size:22px 22px;opacity:.58}.rail{position:absolute;left:18px;right:18px;height:22px;z-index:2;color:#fff;font-size:.72rem;padding:4px 10px}.rail.top{top:10px;background:#d84a45}.rail.bottom{bottom:10px;background:#3171c5}.circuit-view{position:absolute;inset:45px 30px}.slot{position:absolute;display:grid;place-items:center;border:3px dashed #1787e6;background:#d8edffbb;border-radius:12px;color:#0751a6;font-weight:800;cursor:pointer;min-width:86px;min-height:58px}.slot.filled{border-style:solid;border-color:#1a9a70;background:#e7fff5;color:#086044}.slot.highlight{animation:glow 1s infinite alternate}.slot.wire{min-height:14px;height:18px;border-radius:9px}.slot.wire.filled{background:#38576e;border-color:#263e50;color:transparent}.parts-bin{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}.part{border:1px solid #b9cce5;border-radius:12px;background:#f6f9fe;padding:12px 16px;font-weight:750}.part.selected{background:#1769db;color:#fff}.part:disabled{opacity:.42}.tutor{padding:24px}.tutor-head{display:flex;align-items:center;gap:13px}.tutor-head>span{display:grid;place-items:center;width:48px;height:48px;border-radius:16px;background:linear-gradient(135deg,#216edb,#6c54da);color:white;font-weight:900}.tutor h3{margin:0}.tutor>p{line-height:1.6;color:var(--muted)}.progress{height:10px;border-radius:5px;background:#e6edf6;overflow:hidden;margin-top:22px}.progress div{height:100%;width:0;background:linear-gradient(90deg,#1871df,#20b98a);transition:.3s}.progress-label{font-size:.85rem}.checklist{padding:0;list-style:none;display:grid;gap:8px}.checklist li{padding:9px 10px;background:#f5f8fc;border-radius:9px}.checklist li.done{color:#087354;background:#e8faf4}.test-layout{display:grid;grid-template-columns:.82fr 1.1fr 1fr;gap:18px}.logic-console,.physical-view,.truth-card{padding:22px}.logic-console label{display:grid;gap:7px;font-weight:700}.logic-console select{padding:11px;border:1px solid #b8cbe2;border-radius:10px;background:white}.large-gate{margin:20px auto;display:grid;place-items:center;width:130px;height:88px;background:#08284e;color:white;border-radius:16px 48px 48px 16px;font-size:2.3rem;font-weight:900}.switches{display:grid;grid-template-columns:1fr 1fr;gap:10px}.logic-switch{border:1px solid #aac3e4;border-radius:12px;padding:14px;background:#f2f7fd}.logic-switch[aria-pressed=true]{color:white;background:#1769db}.logic-switch strong{font-size:1.25rem;margin-left:10px}.logic-console fieldset{margin:18px 0;border:1px solid var(--line);border-radius:12px}.logic-console fieldset label{display:inline-flex;margin:8px 18px 5px 0}.primary{border:0;border-radius:11px;background:#1769db;color:white;font-weight:800;padding:13px 18px}.feedback{margin-top:14px;padding:12px;border-radius:10px;background:#edf4fc;color:#34516f}.feedback.correct{background:#e5f8f1;color:#087052}.feedback.wrong{background:#fff0ee;color:#942e27}.camera-bar{font-size:.72rem;font-weight:900;letter-spacing:.1em}.live-dot{display:inline-block;width:9px;height:9px;border-radius:50%;background:#20bf83;box-shadow:0 0 0 4px #20bf8322}.physical-board{height:290px;margin:14px 0;position:relative;border-radius:14px;background-color:#e9dfbf;background-image:radial-gradient(#706757 2px,transparent 3px);background-size:20px 20px}.chip{position:absolute;left:42%;top:28%;width:80px;height:130px;border-radius:6px;background:#182334;color:white;display:grid;place-items:center;box-shadow:0 9px 15px #0005}.chip strong{font-size:1.5rem}.signal{position:absolute;background:white;border-radius:7px;padding:5px 8px;font-weight:800}.signal.a{left:8%;top:31%}.signal.b{left:8%;top:55%}.led{position:absolute;right:13%;top:44%;width:42px;height:48px;border-radius:50% 50% 43% 43%;background:#9ba5aa;border:4px solid #d6dde0}.led.on{background:#2ee99d;box-shadow:0 0 30px #17d991}.led-label{position:absolute;right:17%;top:64%;font-weight:900}.physical-view>p{color:var(--muted);font-size:.85rem}.truth-card table{width:100%;border-collapse:collapse}.truth-card th,.truth-card td{padding:9px;border-bottom:1px solid var(--line);text-align:center}.truth-card th{font-size:.75rem;color:var(--muted)}.truth-card>p{color:var(--muted)}.practice-card{max-width:850px;margin:auto;padding:30px}.journey{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:20px 0}.journey div{padding:14px;border-radius:12px;background:#edf4fc}.question h3{line-height:1.45}.answers{display:grid;gap:10px;margin:20px 0}.answer{border:1px solid #b9cde8;background:white;border-radius:11px;padding:13px;text-align:left}.answer:hover{background:#edf5ff}.practice-feedback{padding:15px;border-radius:12px;background:#edf4fc;line-height:1.5}.score{font-size:3rem;font-weight:900;color:#1769db}.certificate-note{padding:15px;border-left:4px solid #1ba97e;background:#ecfaf5}.hidden{display:none!important}footer{text-align:center;padding:36px;color:var(--muted)}@keyframes glow{to{box-shadow:0 0 0 7px #1787e633}}@media(max-width:980px){.hero-visual{display:none}.build-layout,.test-layout{grid-template-columns:1fr}.phase-nav{margin:-35px 0 25px}.physical-board{height:250px}}@media(max-width:620px){main{padding:16px}.hero{padding:38px 20px 62px}.phase-nav{gap:8px}.phase{min-height:82px;padding:10px;grid-template-columns:30px 1fr}.phase span{width:26px;height:26px}.phase small{display:none}.gate-picker{grid-template-columns:1fr}.journey{grid-template-columns:1fr}.section-title h2{font-size:1.55rem}}