:root{--bg:#f6f7fb;--panel:#fff;--text:#18202a;--muted:#6b7280;--line:#e6e8ee;--brand:#4f46e5;--brand2:#7c3aed;--green:#22c55e;--shadow:0 12px 40px rgba(25,33,51,.08)}*{box-sizing:border-box}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--text)}button,input,select,textarea{font:inherit}.topbar{height:70px;background:rgba(255,255,255,.94);border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 22px;position:sticky;top:0;z-index:30;backdrop-filter:blur(12px)}.brand{display:flex;align-items:center;gap:10px;min-width:240px}.brand-mark{width:36px;height:36px;border-radius:11px;background:linear-gradient(135deg,var(--brand),var(--brand2));color:white;font-weight:900;display:grid;place-items:center}.brand strong,.brand small{display:block}.brand small{font-size:11px;color:var(--muted);letter-spacing:.04em}.topbar nav{display:flex;gap:6px;margin:auto}.nav-btn{border:0;background:transparent;padding:10px 13px;border-radius:10px;color:#5f6672;cursor:pointer;text-decoration:none}.nav-btn.active{background:#eef0ff;color:var(--brand);font-weight:700}.account-actions{display:flex;align-items:center;justify-content:flex-end;gap:8px;min-width:390px}.ready-state{font-size:11px;color:var(--muted);white-space:nowrap;margin-right:2px}.account-btn{display:inline-flex;align-items:center;justify-content:center;text-decoration:none;border:1px solid #dfe3eb;background:#fff;color:#4b5563;border-radius:10px;padding:8px 11px;font-size:12px;font-weight:700;white-space:nowrap;transition:.15s}.account-btn:hover{border-color:#b8befd;color:var(--brand);background:#fafaff}.account-btn.teacher{border-color:#c7c9ff;color:var(--brand);background:#f7f7ff}.account-btn.active-account{background:var(--brand);border-color:var(--brand);color:#fff}.account-btn[hidden]{display:none!important}.dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--green);margin-right:5px}.view{display:none;padding:28px;max-width:1600px;margin:auto}.active-view{display:block}.hero{min-height:420px;border-radius:28px;background:linear-gradient(135deg,#111827 0%,#242b56 48%,#4f46e5 100%);padding:58px;color:white;display:grid;grid-template-columns:1.15fr .85fr;align-items:center;overflow:hidden;box-shadow:var(--shadow)}.hero h1{font-size:48px;line-height:1.12;margin:14px 0 18px;letter-spacing:-.03em}.hero p{font-size:17px;line-height:1.8;color:#d9def8;max-width:700px}.eyebrow{text-transform:uppercase;font-size:11px;font-weight:800;letter-spacing:.16em;color:#8b88ff}.hero .eyebrow{color:#a5b4fc}.hero-actions{display:flex;gap:12px;margin-top:26px}.primary,.secondary{border:0;border-radius:11px;padding:11px 16px;cursor:pointer;font-weight:700}.primary{background:var(--brand);color:white}.hero .primary{background:white;color:#2f36a6}.secondary{background:white;border:1px solid var(--line);color:#434956}.hero .secondary{background:rgba(255,255,255,.1);border-color:rgba(255,255,255,.2);color:white}.hero-board{height:300px;position:relative}.mini-board,.mini-module{position:absolute;border-radius:18px;display:grid;place-items:center;text-align:center;box-shadow:0 18px 45px rgba(0,0,0,.25)}.mini-board{width:180px;height:120px;left:90px;top:90px;background:#152e34;border:10px solid #2f5f63;color:#d6fbef}.mini-board span{font-size:12px;color:#8ed6c3}.mini-module{width:110px;height:88px;background:white;color:#222}.mini-module small{color:#6366f1}.oled{right:15px;top:15px}.servo{right:5px;bottom:10px}.hero-wire{position:absolute;height:4px;background:#90e0c5;transform-origin:left;border-radius:5px}.w1{width:170px;left:245px;top:126px;transform:rotate(-18deg)}.w2{width:170px;left:245px;top:177px;transform:rotate(19deg);background:#f6c86d}.section-head,.workspace-head{display:flex;align-items:end;justify-content:space-between;gap:30px;margin:34px 0 18px}.section-head h2,.workspace-head h2{margin:6px 0 0;font-size:28px}.section-head p{color:var(--muted);max-width:460px}.course-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.course-card{background:white;border:1px solid var(--line);border-radius:18px;padding:20px;box-shadow:0 5px 18px rgba(29,38,54,.04);cursor:pointer;transition:.2s}.course-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}.course-icon{font-size:28px}.course-card h3{margin:12px 0 7px}.course-card p{font-size:13px;line-height:1.6;color:var(--muted)}.level{font-size:11px;color:var(--brand);font-weight:700}.idea-box{display:flex;gap:8px;width:min(760px,60vw)}.idea-box input{flex:1;border:1px solid var(--line);border-radius:11px;padding:11px 14px;background:white}.builder-layout{display:grid;grid-template-columns:280px minmax(500px,1fr) 330px;gap:12px;height:calc(100vh - 190px);min-height:620px}.library-panel,.canvas-wrap,.detail-panel,.file-panel,.editor-panel,.ai-panel{background:white;border:1px solid var(--line);border-radius:16px;overflow:hidden}.panel-title{padding:16px;border-bottom:1px solid var(--line)}.panel-title b,.panel-title small{display:block}.panel-title small{color:var(--muted);font-size:11px;margin-top:4px}.panel-title input{width:100%;margin-top:12px;border:1px solid var(--line);border-radius:9px;padding:9px}.module-library{padding:10px;overflow:auto;height:calc(100% - 105px)}.module-card{border:1px solid var(--line);border-radius:13px;padding:10px;margin-bottom:9px;display:grid;grid-template-columns:64px 1fr;gap:10px;cursor:pointer;background:#fff}.module-card:hover{border-color:#b5b7ff}.module-img{height:56px;border-radius:10px;background:linear-gradient(145deg,#edf0f4,#d9dee8);display:grid;place-items:center;font-size:29px;box-shadow:inset 0 0 0 1px #d0d5de}.module-card b{font-size:13px}.module-card p{font-size:11px;color:var(--muted);margin:3px 0 7px}.module-card button{border:0;background:#eef0ff;color:var(--brand);padding:5px 8px;border-radius:7px;font-size:11px;font-weight:700;cursor:pointer}.canvas-wrap{display:flex;flex-direction:column}.canvas-toolbar{height:48px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding:0 14px;font-size:12px;color:var(--muted)}.canvas-toolbar button,.editor-tabs button{border:1px solid var(--line);background:white;border-radius:7px;padding:6px 9px;cursor:pointer;margin-left:4px}.canvas{position:relative;flex:1;overflow:hidden;background-color:#fbfcfe;background-image:radial-gradient(#d9dee8 1px,transparent 1px);background-size:20px 20px}.wires{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}.canvas-empty{position:absolute;inset:0;display:grid;place-content:center;text-align:center;color:#a1a7b1;pointer-events:none}.canvas-empty span{font-size:12px;margin-top:5px}.node{position:absolute;width:150px;min-height:112px;background:white;border:1px solid #cfd4df;border-radius:15px;box-shadow:0 10px 28px rgba(31,42,61,.12);padding:10px;cursor:grab;user-select:none}.node:active{cursor:grabbing}.node.selected{outline:3px solid rgba(79,70,229,.16);border-color:var(--brand)}.node-top{display:flex;gap:9px;align-items:center}.node .module-img{width:48px;height:44px;font-size:23px}.node b{font-size:12px}.node small{display:block;color:var(--muted);font-size:9px;margin-top:2px}.ports{display:flex;justify-content:space-between;margin-top:10px;font-size:9px;color:#818896}.port{display:flex;align-items:center;gap:4px}.port-dot{width:7px;height:7px;border-radius:50%;background:#ef4444}.port.signal .port-dot{background:#3b82f6}.detail-panel{padding:18px;overflow:auto}.empty-detail{height:100%;display:grid;place-content:center;text-align:center;color:#9299a4}.empty-detail span{font-size:32px}.detail-photo{height:150px;border-radius:15px;background:linear-gradient(145deg,#e9edf2,#cfd6df);display:grid;place-items:center;font-size:70px;margin-bottom:16px}.detail-panel h3{margin:6px 0}.detail-panel p,.detail-panel li{font-size:13px;line-height:1.65;color:#5d6470}.detail-section{border-top:1px solid var(--line);padding-top:13px;margin-top:13px}.code-mini{background:#111827;color:#d1fae5;border-radius:10px;padding:11px;font:11px/1.55 ui-monospace,monospace;white-space:pre-wrap}.ide-actions{display:flex;gap:8px}.ide-actions select{border:1px solid var(--line);border-radius:10px;padding:0 12px;background:white}.ide-layout{display:grid;grid-template-columns:210px 1fr 300px;gap:12px;height:calc(100vh - 190px);min-height:650px}.file-panel{padding:16px}.file{padding:9px 10px;border-radius:8px;margin-top:8px;font-size:13px}.file.active{background:#eef0ff;color:var(--brand);font-weight:700}.tip{font-size:11px;line-height:1.6;color:var(--muted);margin-top:25px}.editor-panel{display:flex;flex-direction:column}.editor-tabs{height:48px;display:flex;align-items:center;justify-content:space-between;padding:0 14px;border-bottom:1px solid var(--line);font-size:13px;font-weight:700}#editor{flex:1;resize:none;border:0;outline:0;background:#111827;color:#e5e7eb;padding:18px;font:14px/1.7 ui-monospace,SFMono-Regular,Menlo,monospace;tab-size:4}.terminal{height:180px;background:#090e17;color:#b7c0cd;border-top:1px solid #303846}.terminal-title{font-size:11px;padding:8px 12px;border-bottom:1px solid #252c36;color:#8f9baa}.terminal pre{margin:0;padding:10px 12px;font:12px/1.6 ui-monospace,monospace;white-space:pre-wrap}.ai-panel{padding:18px}.ai-badge{font-size:11px;font-weight:800;color:var(--brand);background:#eef0ff;padding:5px 8px;border-radius:8px}.ai-panel h3{margin:15px 0 8px}.ai-panel p{font-size:13px;color:var(--muted);line-height:1.7}.quick{display:grid;gap:7px;margin-top:18px}.quick button{border:1px solid var(--line);background:white;text-align:left;border-radius:9px;padding:9px;cursor:pointer;color:#4f5662}@media(max-width:1250px){.ready-state{display:none}.account-actions{min-width:255px}.brand{min-width:190px}.nav-btn{padding:9px 10px;font-size:12px}}@media(max-width:1100px){.course-grid{grid-template-columns:repeat(2,1fr)}.builder-layout{grid-template-columns:230px 1fr}.detail-panel{display:none}.ide-layout{grid-template-columns:170px 1fr}.ai-panel{display:none}.hero{grid-template-columns:1fr}.hero-board{display:none}.brand{min-width:auto}.account-actions{min-width:auto}.account-btn{padding:7px 9px}.topbar nav{margin-left:auto}}@media(max-width:820px){.account-actions{gap:4px}.account-btn{font-size:11px;padding:7px}.teacher{display:none}}@media(max-width:720px){.view{padding:14px}.topbar{padding:0 10px}.topbar nav{margin-left:auto}.nav-btn{padding:8px;font-size:12px}.brand small{display:none}.hero{padding:28px;min-height:360px}.hero h1{font-size:34px}.course-grid{grid-template-columns:1fr}.workspace-head{align-items:stretch;flex-direction:column}.idea-box{width:100%;flex-direction:column}.builder-layout{display:block;height:auto}.library-panel{height:320px;margin-bottom:10px}.canvas-wrap{height:560px}.ide-layout{display:block;height:auto}.file-panel{display:none}.editor-panel{height:700px}.account-btn{display:none}.account-btn.active-account{display:inline-flex!important}}