:root{--bg:#f3f4f6;--surface:#fff;--border:#e5e7eb;--ink:#1f2430;--ink-soft:#6b7280;--brand:#0f47cc;--brand-soft:#eef3ff;--run:#15a34a;--run-hover:#128040;--stop:#dc2626;--ok:#16a34a;--idle:#9ca3af;--shadow:0 1px 2px #1018280f, 0 1px 3px #1018281a}*{box-sizing:border-box;margin:0}body{background:var(--bg);height:100vh;color:var(--ink);-webkit-font-smoothing:antialiased;flex-direction:column;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;display:flex}#topbar{background:var(--surface);border-bottom:1px solid var(--border);align-items:center;gap:20px;padding:10px 18px;display:flex}#brand{align-items:center;gap:10px;display:flex}#brandLogo{width:auto;height:34px;display:block}#brandName{letter-spacing:-.02em;color:var(--ink);font-size:1.15rem;font-weight:800}#controls{align-items:center;gap:8px;display:flex}.btn{cursor:pointer;background:var(--surface);color:var(--ink);border:1px solid #0000;border-radius:10px;align-items:center;gap:7px;padding:9px 15px;font-family:inherit;font-size:.9rem;font-weight:600;line-height:1;transition:background .12s,border-color .12s,color .12s,transform 40ms;display:inline-flex}.btn svg{flex:none;width:18px;height:18px}.btn:active{transform:translateY(1px)}.btn .label{white-space:nowrap}.btn svg[fill=none],.select-wrap svg{stroke:currentColor;stroke-width:2px;stroke-linecap:round;stroke-linejoin:round}.btn-run svg,.btn-stop svg{fill:currentColor}.btn-run{background:var(--run);color:#fff}.btn-run:hover{background:var(--run-hover)}.btn-stop{color:var(--stop);border-color:var(--border)}.btn-stop:hover{background:#fef2f2;border-color:#f4c9c9}.btn-connect{color:var(--brand);border-color:var(--brand)}.btn-connect:hover{background:var(--brand);color:#fff}.btn-ghost{color:var(--ink-soft);border-color:var(--border)}.btn-ghost:hover{color:var(--ink);background:#f9fafb}.btn:focus-visible,.select-wrap:focus-within{outline:2px solid var(--brand);outline-offset:2px}.btn-icon{padding:9px}.btn-icon svg{stroke:currentColor;stroke-width:2px;stroke-linecap:round;stroke-linejoin:round;width:19px;height:19px}.overlay{z-index:200;background:#11182873;justify-content:center;align-items:center;padding:20px;display:flex;position:fixed;inset:0}.overlay[hidden]{display:none}.welcome-card{background:var(--surface);text-align:center;border-radius:20px;width:100%;max-width:440px;padding:32px 34px;box-shadow:0 20px 50px #1018284d}.welcome-logo{width:auto;height:56px;margin-bottom:10px}.welcome-card h1{letter-spacing:-.02em;color:var(--ink);font-size:1.5rem;font-weight:800}.welcome-sub{color:var(--ink-soft);margin-top:6px;font-size:.98rem}.welcome-steps{text-align:left;flex-direction:column;gap:14px;margin:22px 0 24px;list-style:none;display:flex}.welcome-steps li{color:var(--ink);align-items:flex-start;gap:12px;font-size:.96rem;line-height:1.4;display:flex}.step-n{background:var(--brand-soft);width:24px;height:24px;color:var(--brand);border-radius:50%;flex:none;justify-content:center;align-items:center;font-size:.82rem;font-weight:700;display:flex}.welcome-card .btn-run{padding:11px 22px;font-size:1rem}#instructorToggle[aria-pressed=true]{background:var(--brand);color:#fff;border-color:var(--brand)}.inst-panel{z-index:150;background:var(--surface);border-left:1px solid var(--border);flex-direction:column;width:380px;max-width:92vw;padding:16px 18px 24px;display:flex;position:fixed;top:0;bottom:0;right:0;overflow-y:auto;box-shadow:-12px 0 40px #1018281f}.inst-panel[hidden]{display:none}.inst-head{justify-content:space-between;align-items:center;display:flex}.inst-head h2{letter-spacing:-.02em;font-size:1.2rem;font-weight:800}.inst-intro{color:var(--ink-soft);margin:6px 0 18px;font-size:.9rem;line-height:1.45}.inst-section{margin-bottom:20px}.inst-section h3{text-transform:uppercase;letter-spacing:.06em;color:var(--ink-soft);margin-bottom:10px;font-size:.72rem;font-weight:700}.inst-ch{border:1px solid var(--border);border-radius:12px;margin-bottom:10px;padding:12px}.inst-ch-title{color:var(--ink);font-size:.95rem;font-weight:700}.inst-ch-goal{color:var(--ink-soft);margin:3px 0 10px;font-size:.85rem;line-height:1.4}.inst-ch-link{gap:6px;display:flex}.inst-ch-link input{min-width:0;font:inherit;color:var(--ink-soft);border:1px solid var(--border);background:#fafafa;border-radius:8px;flex:1;padding:7px 9px;font-size:.78rem}.inst-copy{flex:none;padding:7px 11px;font-size:.82rem}.inst-hint{color:var(--ink-soft);border:1px dashed var(--border);background:#fafafa;border-radius:12px;padding:12px;font-size:.85rem;line-height:1.5}.prog-row{border-bottom:1px solid var(--border);flex-wrap:wrap;align-items:center;gap:6px;padding:8px 0;font-size:.85rem;display:flex}.prog-row:last-child{border-bottom:none}.prog-name{color:var(--ink);margin-right:4px;font-weight:600}.prog-chip{background:var(--brand-soft);color:var(--brand);border-radius:999px;padding:2px 8px;font-size:.74rem}.prog-none{color:var(--ink-soft)}#academyToggle[aria-pressed=true]{background:var(--brand);color:#fff;border-color:var(--brand)}.acad-panel{z-index:160;background:var(--bg);flex-direction:column;display:flex;position:fixed;inset:0}.acad-panel[hidden]{display:none}.acad-head{background:var(--surface);border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:12px 22px;display:flex}.acad-head h2{letter-spacing:-.02em;font-size:1.15rem;font-weight:800}.acad-level{letter-spacing:.04em;text-transform:uppercase;color:#fff;background:var(--brand);vertical-align:2px;border-radius:999px;margin-left:6px;padding:3px 9px;font-size:.72rem;font-weight:800}.acad-body{flex:1;width:100%;max-width:980px;margin:0 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h3{text-transform:uppercase;letter-spacing:.06em;color:var(--brand);margin-bottom:10px;font-size:.72rem;font-weight:700}.acad-section p{font-size:.92rem;line-height:1.6}.acad-list{flex-direction:column;gap:6px;margin:0;padding-left:18px;font-size:.92rem;line-height:1.55;display:flex}.acad-prep{margin-top:10px}.acad-seq{flex-direction:column;gap:10px;margin:0;padding-left:18px;font-size:.92rem;line-height:1.55;display:flex}.acad-seq-head{align-items:center;gap:8px;margin-bottom:2px;display:flex}.acad-note{color:var(--ink-soft);margin-bottom:10px;font-size:.85rem;line-height:1.5}.acad-script{border-left:3px solid var(--brand);background:var(--brand-soft);border-radius:0 10px 10px 0;margin:0;padding:12px 16px;font-size:.92rem;font-style:italic;line-height:1.6}.acad-slides{flex-direction:column;gap:8px;display:flex}.acad-slide{border:1px solid var(--border);color:inherit;border-radius:12px;align-items:center;gap:12px;padding:10px 12px;text-decoration:none;transition:border-color 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var(--border);background:var(--brand-soft);border-radius:12px;margin:10px 10px 0;padding:10px 12px}#challengeBar[hidden]{display:none}.ch-goal{color:var(--ink);align-items:center;gap:8px;font-size:.9rem;line-height:1.35;display:flex}.ch-badge{letter-spacing:.04em;text-transform:uppercase;color:#fff;background:var(--brand);border-radius:999px;flex:none;padding:3px 8px;font-size:.68rem;font-weight:800}.ch-result{border-top:1px solid #0f47cc26;align-items:center;gap:8px;margin-top:8px;padding-top:8px;font-size:.9rem;font-weight:700;display:flex}.ch-result[hidden]{display:none}.ch-result.pass{color:var(--ok)}.ch-result.fail{color:#b45309}.ch-score{color:var(--ink-soft);font-weight:600}.login-screen{z-index:300;background:linear-gradient(160deg,#eef3ff 0%,#f6f8fc 55%,#fff 100%);justify-content:center;align-items:center;padding:24px;display:flex;position:fixed;inset:0}.login-screen[hidden]{display:none}.login-card{background:var(--surface);border:1px solid var(--border);text-align:center;border-radius:22px;width:100%;max-width:400px;padding:40px 40px 34px;box-shadow:0 24px 60px #10182829}.login-logo{width:auto;height:76px;margin-bottom:14px}.login-brand{letter-spacing:-.03em;color:var(--ink);font-size:2rem;font-weight:800}.login-sub{color:var(--ink-soft);margin:8px 0 26px;font-size:1rem;line-height:1.4}.login-btn{justify-content:center;width:100%;padding:13px 20px;font-size:1.02rem}.login-checking{color:var(--ink-soft);font-size:.9rem}.login-checking[hidden]{display:none}.user-chip{align-items:center;gap:8px;display:flex}.user-chip[hidden]{display:none}.user-avatar{object-fit:cover;background:var(--brand-soft);border:1px solid var(--border);border-radius:50%;width:28px;height:28px}.user-name{color:var(--ink);text-overflow:ellipsis;white-space:nowrap;max-width:140px;font-size:.88rem;font-weight:600;overflow:hidden}@media (width<=1024px){#sidePanel{width:320px}#simCanvas{width:300px;height:300px}}@media 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var(--border);min-width:230px;box-shadow:var(--shadow);z-index:60;border-radius:12px;padding:6px;position:absolute;top:calc(100% + 6px);left:0}.menu[hidden]{display:none}.menu-item,.project-row .open,.project-row .del{font:inherit;text-align:left;color:var(--ink);cursor:pointer;background:0 0;border:none;border-radius:8px;align-items:center;font-size:.88rem;font-weight:500;display:flex}.menu-item{gap:8px;width:100%;padding:9px 10px}.menu-item:hover{background:#f3f4f6}.menu-sep{background:var(--border);height:1px;margin:6px 4px}.menu-list{max-height:260px;overflow-y:auto}.menu-empty{color:var(--ink-soft);padding:9px 10px;font-size:.82rem}.project-row{align-items:center;gap:2px;display:flex}.project-row .open{text-overflow:ellipsis;white-space:nowrap;flex:1;padding:9px 10px;overflow:hidden}.project-row .open:hover{background:#f3f4f6}.project-row .del{width:30px;height:32px;color:var(--ink-soft);justify-content:center}.project-row .del svg{stroke:currentColor;stroke-width:2px;stroke-linecap:round;width:15px;height:15px}.project-row .del:hover{color:var(--stop);background:#fef2f2}.lang-select{appearance:none;color:var(--ink);border:1px solid var(--border);background:var(--surface);cursor:pointer;border-radius:10px;padding:8px 12px;font-family:inherit;font-size:.85rem;font-weight:600}.lang-select:hover{border-color:#d0d5dd}.lang-select:focus-visible{outline:2px solid var(--brand);outline-offset:2px}#connectArea{align-items:center;gap:12px;margin-left:auto;display:flex}#botStatus{color:var(--ink-soft);align-items:center;gap:7px;font-size:.85rem;font-weight:500;display:inline-flex}#botStatus .bot-icon{width:19px;height:19px;stroke:var(--idle);stroke-width:2px;stroke-linecap:round;stroke-linejoin:round;transition:stroke .15s}#botStatus.connected{color:var(--ink)}#botStatus.connected .bot-icon{stroke:#f97316}.battery{color:var(--idle);align-items:center;gap:4px;font-size:.82rem;font-weight:600;display:inline-flex}.battery[hidden]{display:none}.battery svg{width:22px;height:22px}.battery.ok{color:var(--ok)}.battery.mid{color:#d97706}.battery.low{color:var(--stop);animation:1.4s ease-in-out infinite batt-pulse}@keyframes batt-pulse{50%{opacity:.45}}main{flex:1;min-height:0;display:flex}#blocklyDiv{flex:1}body.sim-hidden #sidePanel{display:none}#simToggle[aria-pressed=false],#blocksToggle[aria-pressed=false]{color:var(--brand);background:var(--brand-soft);border-color:var(--brand-soft)}#sidePanel{border-left:1px solid var(--border);background:var(--surface);flex-direction:column;width:380px;display:flex}#simCanvas{border:1px solid var(--border);background:#fff;border-radius:12px;width:360px;height:360px;margin:10px}#logPanel{color:var(--ink-soft);border-top:1px solid var(--border);background:#fafafa;flex:1;padding:10px 14px;font-family:SF Mono,JetBrains 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