:root{font-family:Arial,"PingFang TC","Microsoft JhengHei",sans-serif;color:#252a29;background:#f5f4eb;font-synthesis:none;--ink:#252a29;--paper:#f5f4eb;--line:#dddfd6;--lime:#d4f76b;--peach:#ffc1a0;--violet:#d6c8fb;--blue:#284add}
*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button{cursor:pointer;color:inherit}button:disabled{cursor:default;opacity:.45}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--blue);outline-offset:4px}button{border:0;background:none}a{color:inherit}h1,h2,h3,p{margin:0}h1,h2{letter-spacing:-.035em}button,.card{transition:background .15s,transform .15s}button:hover:not(:disabled){filter:brightness(.97)}.brand{display:inline-flex;align-items:center;font-size:27px;font-weight:850;letter-spacing:-1.5px}.brand span{font-weight:400}.brand i{font-style:normal;font-size:32px;color:var(--blue);margin-left:8px}.topbar{height:76px;padding:0 36px;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:26px;background:var(--paper);position:fixed;top:0;left:0;right:0;z-index:20}.divider{height:24px;border-left:1px solid var(--line)}.seat-tag{font-size:13px;font-weight:700;line-height:1.5}.seat-tag small{display:block;font-size:10px;color:#777c72;font-weight:400;letter-spacing:.1em}.top-right{margin-left:auto;display:flex;gap:24px;align-items:center;font-size:12px}.record{display:flex;align-items:center;gap:7px}.dot{width:7px;height:7px;background:#638546;border-radius:50%}.record.private .dot{background:#8a72c2}.wallet{background:#e9eadd;border:1px solid #d9dccd;border-radius:24px;padding:9px 15px;font-weight:700}.wallet b{margin-left:8px}.tabs{position:fixed;top:76px;left:0;right:0;height:48px;background:var(--paper);border-bottom:1px solid var(--line);padding:0 36px;display:flex;align-items:stretch;gap:8px;z-index:19;overflow-x:auto}.tab{padding:0 20px;border-bottom:3px solid transparent;font-size:13px;white-space:nowrap;color:#71776e}.tab.active{border-bottom-color:var(--ink);color:var(--ink);font-weight:700}.tab .tab-icon{margin-right:8px}.tab small{font-size:10px;margin-left:10px;color:#586448}.bottom{height:62px;position:fixed;bottom:0;left:0;right:0;border-top:1px solid var(--line);background:var(--paper);padding:0 30px;display:flex;align-items:center;gap:5px;z-index:20}.bottom button{border-radius:8px;font-size:12px;padding:11px 15px;white-space:nowrap}.bottom .fault{color:#9f493a;margin-left:8px}.bottom .spacer{flex:1}.sync{font-size:10px;color:#71776e;margin-right:14px}.main{padding:155px 48px 96px;max-width:1500px;margin:auto;min-height:100vh}.eyebrow{font:11px ui-monospace,monospace;letter-spacing:.13em;color:#697467;margin-bottom:14px}.page-title{font-size:42px;line-height:1.2;margin-bottom:12px}.muted{color:#788073;font-size:13px;line-height:1.8}.page-head{display:flex;justify-content:space-between;align-items:end;margin-bottom:27px}.pill{border:1px solid var(--line);border-radius:24px;padding:8px 13px;font-size:11px;white-space:nowrap}.primary{background:var(--ink);color:white;border-radius:12px;padding:15px 25px;font-size:15px;font-weight:650;display:inline-flex;align-items:center;justify-content:center;gap:18px;box-shadow:0 3px 0 #101714}.secondary{background:#fff;border:1px solid var(--line);border-radius:10px;padding:11px 18px;font-size:13px}.text-button{font-size:12px;text-decoration:underline;text-underline-offset:4px;padding:10px}.seat-screen{display:flex;min-height:calc(100vh - 255px);align-items:center;justify-content:center;text-align:center}.seat-number{font-size:clamp(130px,24vh,220px);font-weight:800;letter-spacing:-.09em;line-height:1.05;margin-left:-.08em}.seat-screen .class{font-size:24px}.seat-screen p{margin:18px 0 28px;color:#737b6c}.seat-orbit{position:relative;padding:15px 100px}.seat-orbit:before,.seat-orbit:after{content:'✳';position:absolute;font-size:70px;color:var(--blue);top:30px;left:0;transform:rotate(20deg)}.seat-orbit:after{content:'✦';font-size:45px;left:auto;right:0;top:180px;color:#8caf44}.setup{max-width:660px;margin:40px auto;text-align:center}.setup h1{font-size:38px;margin-bottom:15px}.setup .targets{display:flex;justify-content:center;gap:20px;margin:34px 0}.target{border:2px solid var(--ink);background:var(--lime);width:100px;height:100px;border-radius:28px;font-size:40px;box-shadow:0 6px 0 #adb66f}.keycap{display:inline-block;padding:22px 80px;border:2px solid var(--ink);border-bottom-width:7px;border-radius:15px;background:white;font:20px monospace;margin:35px}.symbol-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;max-width:400px;margin:30px auto}.symbol-grid button{font-size:42px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:20px}.module-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:30px}.card{border:1px solid #d5d9cc;border-radius:20px;overflow:hidden;background:#fff;cursor:pointer;text-align:left;padding:0;display:flex;flex-direction:column}.card:hover{transform:translateY(-4px)}.card-art{height:205px;position:relative;overflow:hidden;display:flex;align-items:center;justify-content:center}.lime{background:var(--lime)}.peach{background:var(--peach)}.violet{background:var(--violet)}.card-art .big-symbol{font:100px ui-monospace,monospace;letter-spacing:-10px;transform:rotate(-7deg);border:2px solid var(--ink);border-radius:18px;padding:5px 24px;background:#ffffff55;box-shadow:9px 10px 0 #252a2926}.card-art .number{position:absolute;left:18px;top:16px;font:12px monospace}.card-art .orbit{position:absolute;right:-15px;bottom:-25px;width:160px;height:160px;border:1px solid #252a2955;border-radius:50%}.card-info{padding:24px}.card-info h2{font-size:25px;margin:8px 0}.card-info .card-bottom{border-top:1px solid var(--line);margin-top:22px;padding-top:18px;display:flex;justify-content:space-between;align-items:center;font-size:12px}.workshop{display:grid;grid-template-columns:minmax(0,1fr) 282px;border:1px solid #d4d9cc;border-radius:23px;overflow:hidden;background:#fff;min-height:420px}.stage{position:relative;display:flex;flex-direction:column;justify-content:space-between;padding:28px 32px;min-height:445px;background-color:#edf0e4;background-image:radial-gradient(#bfc8b4 1px,transparent 1px);background-size:20px 20px;overflow:hidden}.stage.peach{background-color:#f7e8db;background-image:radial-gradient(#d4bdae 1px,transparent 1px)}.stage.violet{background-color:#eee9f9;background-image:radial-gradient(#c7bddb 1px,transparent 1px)}.stage-top{display:flex;align-items:center;justify-content:space-between;font-size:11px;letter-spacing:.08em;color:#66715f}.stage-top .live-tag{border:1px solid #79827055;background:#ffffff88;padding:6px 10px;border-radius:30px;letter-spacing:0}.mission{padding:27px 25px;background:#fff;display:flex;flex-direction:column;border-left:1px solid var(--line)}.mission .eyebrow{font-size:10px;margin-bottom:14px}.mission h2{font-size:25px;line-height:1.5;margin-bottom:12px}.mission p{font-size:13px;line-height:1.8;color:#72776c}.mission .primary{margin-top:24px;width:100%;font-size:13px;padding:14px 8px}.mission .hint{margin-top:20px;background:#f4f5ee;padding:14px;border-radius:12px;color:#67705d;font-size:12px;line-height:1.8}.mission .source{margin-top:auto;padding-top:24px;font-size:10px;color:#969a90}.progress-dots{display:flex;gap:7px;margin-bottom:22px}.progress-dots span{height:5px;flex:1;background:#e8eade;border-radius:4px}.progress-dots span.done{background:#678a3c}.progress-dots span.current{background:var(--lime)}.machine{background:var(--ink);color:var(--paper);border-radius:24px;padding:24px 28px;max-width:650px;width:100%;margin:25px auto;box-shadow:0 12px 0 #bec6b1,0 18px 28px #2433191c;position:relative}.machine:before,.machine:after{content:'+';position:absolute;top:8px;color:#66705e;font-size:13px}.machine:before{left:13px}.machine:after{right:13px}.machine-head{display:flex;justify-content:space-between;align-items:center;color:#a8b69a;font:10px monospace;letter-spacing:.1em}.readout{text-align:center;margin:12px auto;font:800 80px ui-monospace,monospace;letter-spacing:-.05em;color:var(--lime);line-height:1.1}.readout small{font:12px Arial,sans-serif;display:block;letter-spacing:0;color:#9ba98f;margin-top:8px}.switches{display:flex;gap:9px;justify-content:center;margin-top:23px}.bit{flex:1;max-width:84px;min-width:0;border:1px solid #56644f;border-radius:12px;background:#354033;padding:13px 3px 8px;color:#a3b697;position:relative}.bit.on{background:var(--lime);color:#283522;border-color:var(--lime);box-shadow:0 0 22px #d4f76b15}.bit .bulb{display:block;width:17px;height:17px;margin:0 auto 9px;border:2px solid currentColor;border-radius:50%;opacity:.6}.bit.on .bulb{background:#345026;opacity:1;box-shadow:0 0 0 5px #34502616}.bit strong{display:block;font:700 24px monospace}.bit small{display:block;font:10px monospace;margin-top:7px;opacity:.7}.machine-foot{font:11px monospace;color:#b4c29f;text-align:center;margin-top:20px;min-height:15px}.stage-controls{display:flex;gap:9px;align-items:center;justify-content:center;flex-wrap:wrap}.stage-controls button{background:#ffffffbb;border:1px solid #8f9a8055;border-radius:8px;padding:9px 14px;font-size:12px}.stage-controls label{font-size:11px;margin-right:5px}.delivery-route{display:flex;align-items:center;gap:15px;margin:18px auto 0;width:90%;font-size:13px;color:#597442}.delivery-route .rail{height:2px;border-bottom:2px dashed #9dad8b;flex:1;position:relative}.delivery-route .parcel{position:absolute;top:-20px;left:0;background:var(--lime);padding:5px;border:1px solid #52653d;border-radius:5px;transition:left .7s}.delivery-route.delivered .parcel{left:85%}.destination{border:1px solid #a1ad95;background:#ffffffaa;border-radius:8px;padding:8px 14px;font-size:12px}.below{display:grid;grid-template-columns:1fr auto;align-items:center;gap:20px;margin-top:20px}.below p{font-size:12px;color:#7b8175;line-height:1.8}.discovery{background:#eef6d9;border:1px solid #d6e3be;border-radius:13px;padding:16px 20px;margin-top:20px;line-height:1.7;font-size:13px}.discovery.error{background:#fff1df;border-color:#e9d5b4}.factory{display:grid;grid-template-columns:1fr 1fr;gap:20px;align-items:center;margin:28px 0}.tank{border:2px solid #464934;border-radius:20px;background:#fff8e9;min-height:205px;position:relative;padding:20px;box-shadow:5px 7px 0 #4b473426;text-align:center}.tank .actual{font:700 58px monospace;color:#393e2e;margin:20px 0 10px}.tank .bubbles{height:25px;background:radial-gradient(circle,#eda15f 4px,transparent 5px);background-size:20px 20px;border-radius:10px;animation:bubble 3s linear infinite}.counter{background:var(--ink);border-radius:20px;padding:24px;text-align:center;box-shadow:0 7px 0 #777968}.counter .readout{color:var(--peach);font-size:64px}.counter .binary{font:16px monospace;letter-spacing:.18em;color:#f6c49e}.counter .label,.tank .label{font:10px monospace;letter-spacing:.08em;color:#9ca393}.tank .label{color:#77775f}.bit-strip{display:flex;gap:4px;margin:18px 0 5px;justify-content:center}.bit-strip i{font-style:normal;background:#484d3a;color:#ffd0aa;padding:6px 8px;border-radius:5px;font:12px monospace}.bit-strip i.active{background:var(--peach);color:#383629}.packet-board{display:grid;grid-template-columns:1fr 42px 1fr;align-items:center;gap:10px;margin:18px 0}.terminal{border:2px solid var(--ink);background:#faf8ff;border-radius:16px;padding:20px 16px;min-height:210px;box-shadow:5px 7px 0 #85749740;text-align:center;overflow:hidden}.terminal .label{font:10px monospace;color:#8b7d9f;letter-spacing:.08em}.terminal .message{font-size:42px;min-height:80px;display:flex;align-items:center;justify-content:center;overflow-wrap:anywhere;line-height:1.1;padding:10px 0}.terminal select{width:100%;border:1px solid #cfc3df;background:#eee8f9;padding:9px;border-radius:8px;font-size:12px;color:#544361}.packet-arrow{text-align:center;font-size:26px;color:#8b76b0}.byte-tray{background:#242631;border-radius:14px;padding:15px 20px;display:flex;gap:6px;align-items:center;flex-wrap:wrap;min-height:62px;color:#b0a4c8;font:11px monospace}.byte-tray .byte{background:#454054;border:1px solid #776990;padding:9px 10px;color:#e1d0ff;border-radius:6px;font-size:14px}.token-palette{display:flex;justify-content:center;gap:6px;margin-top:15px;flex-wrap:wrap}.token-palette button{border:1px solid #c1b4d2;border-radius:8px;background:#ffffffa0;padding:8px 13px;font-size:18px}.token-palette button.selected{background:var(--violet);border:2px solid #6b598d;padding:7px 12px}.success-stamp{position:absolute;right:25px;top:55px;border:3px solid #527531;color:#45622a;background:#e9ffc9eb;border-radius:50%;width:94px;height:94px;display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:800;transform:rotate(14deg);animation:stamp .3s ease-out;z-index:4}.confetti{pointer-events:none;position:fixed;inset:0;z-index:100;overflow:hidden}.confetti i{position:absolute;top:-30px;width:10px;height:16px;animation:fall 1.5s ease-in forwards;background:var(--lime)}.completion-banner{background:var(--lime);border-radius:14px;padding:20px 24px;display:flex;gap:20px;align-items:center;margin-bottom:22px}.completion-banner strong{font-size:22px}.completion-banner p{font-size:12px;margin-top:7px}.completion-banner button{margin-left:auto}.offer{border:1px solid var(--line);border-radius:15px;padding:24px;background:#fff;margin:18px 0}.offer h2{font-size:22px;margin:10px 0}.offer .funding{height:8px;background:#e9ebdf;border-radius:5px;margin:18px 0;overflow:hidden}.offer .funding span{height:100%;background:var(--lime);display:block}.offer footer{display:flex;align-items:center;gap:10px;margin-top:18px}.offer input{width:90px;border:1px solid var(--line);border-radius:8px;padding:10px}.empty{padding:50px 30px;border:1px dashed #b4bbaa;border-radius:20px;text-align:center;margin-top:30px}.empty .giant{font-size:70px;color:#768a52;margin-bottom:20px}.private-screen{text-align:center;max-width:640px;margin:45px auto}.private-screen h1{font-size:38px;margin-bottom:20px}.private-screen .clock{font:80px monospace;margin:30px}.private-screen .moon{font-size:70px;color:#8a75ba;margin-bottom:20px}.private-screen p{color:#74756e;line-height:1.9}.loading{text-align:center;margin:20vh auto}.loading p{margin-top:25px;color:#758168}dialog{border:1px solid var(--line);border-radius:22px;padding:30px;max-width:510px;width:calc(100% - 40px);color:var(--ink);background:var(--paper)}dialog::backdrop{background:#18231155;backdrop-filter:blur(4px)}dialog h2{font-size:27px;margin-bottom:12px}dialog p{font-size:14px;line-height:1.8;color:#72796b}dialog .choices{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:25px 0}dialog .choices button{padding:20px 10px;background:#fff;border:1px solid var(--line);border-radius:14px;font-size:15px}dialog .close{float:right;font-size:24px;margin-top:-12px;margin-right:-12px}#toast{position:fixed;bottom:82px;left:50%;transform:translateX(-50%);border:1px solid #9fae83;background:#f0f7e6;padding:13px 22px;border-radius:12px;font-size:13px;z-index:101;box-shadow:0 5px 20px #1d2b1a15;display:none;max-width:90vw}.warning{color:#a64d3c}.hidden{display:none!important}.admin{max-width:1150px;margin:auto;padding:40px}.admin header{display:flex;justify-content:space-between;align-items:center;margin-bottom:35px}.admin section{background:white;border:1px solid var(--line);padding:25px;border-radius:18px;margin:20px 0}.admin h2{font-size:22px;margin-bottom:16px}.admin label{font-size:12px;display:block;color:#717869}.admin input,.admin textarea,.admin select{border:1px solid var(--line);padding:10px;border-radius:8px;max-width:100%;margin:6px 0 12px;background:#f9faf5}.admin textarea{width:100%;min-height:65px}.fields{display:flex;gap:15px;flex-wrap:wrap}.fields input{width:140px}.admin table{width:100%;border-collapse:collapse;font-size:12px}.admin td,.admin th{padding:12px;text-align:left;border-bottom:1px solid var(--line)}.admin .station-map{position:relative;min-height:240px;background:#f2f4eb;border-radius:12px;padding:20px}.station-chip{position:absolute;width:100px;background:#fff;border:1px solid #ced7c4;border-radius:9px;padding:10px;font-size:11px}.station-chip.fault{background:#ffdfd1}.station-chip.unverified{border-style:dashed}.admin pre{overflow-wrap:anywhere;white-space:pre-wrap;font-size:12px;max-height:150px;overflow:auto}.admin .status{font-size:12px;color:#737d65}.admin .result{word-break:break-all;padding:15px;border-radius:10px;background:#edf5db;margin-top:15px;font-size:12px}.responsive-scroll{overflow:auto}.small{font-size:11px}
@keyframes fall{to{transform:translateY(105vh) rotate(480deg);opacity:0}}@keyframes bubble{to{background-position:20px -20px}}@keyframes stamp{from{transform:scale(1.8) rotate(-5deg);opacity:0}to{transform:scale(1) rotate(14deg);opacity:1}}
@media(min-width:1600px){.main{padding-top:170px}.stage{min-height:500px}.machine{margin:40px auto}.readout{font-size:95px}}@media(max-width:1000px){.main{padding-left:25px;padding-right:25px}.topbar{padding:0 24px}.workshop{grid-template-columns:minmax(0,1fr) 250px}.stage{padding:22px 20px}.mission{padding:23px 20px}.top-right{gap:12px}.bottom{padding:0 15px}.bottom button{padding:10px}.module-grid{gap:13px}.card-info{padding:18px}.card-info h2{font-size:22px}.bit strong{font-size:20px}.card-art{height:165px}}
@media(max-width:740px){.topbar{height:65px;gap:14px;padding:0 17px}.brand{font-size:23px}.topbar .divider,.top-right .time,.record .label{display:none}.top-right{gap:8px}.tabs{top:65px;padding:0 15px;height:44px}.main{padding:133px 16px 100px}.page-title{font-size:31px}.page-head{align-items:start}.page-head .pill{display:none}.workshop{grid-template-columns:1fr}.mission{border-left:0;border-top:1px solid var(--line)}.mission .source{padding-top:15px}.mission .primary{margin-top:15px}.stage{min-height:375px;padding:20px 16px}.machine{padding:20px 16px}.module-grid{grid-template-columns:1fr}.card-art{height:150px}.card{display:grid;grid-template-columns:130px 1fr}.card-art{height:100%}.card-art .big-symbol{font-size:47px;padding:8px}.card-info .card-bottom{margin-top:12px;padding-top:12px}.card-info h2{font-size:23px}.bottom{overflow-x:auto;height:66px;gap:0;padding:0 7px}.bottom button{font-size:11px;padding:11px 8px}.bottom .sync{display:none}.bottom .fault{margin-left:0}.seat-orbit{padding:10px 55px}.seat-orbit:before{font-size:40px}.seat-orbit:after{font-size:30px}.seat-number{font-size:170px}.page-title{font-size:32px}.factory{gap:13px}.counter{padding:20px 12px}.tank{padding:20px 10px}.counter .readout{font-size:54px}.terminal{padding:20px 10px}.packet-board{grid-template-columns:1fr 22px 1fr;gap:5px}.terminal .message{font-size:30px}.below{grid-template-columns:1fr}.completion-banner{flex-wrap:wrap}.completion-banner button{margin-left:0}.admin{padding:20px}.admin header{gap:15px}.admin section{padding:20px}.admin .fields{gap:8px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important}.confetti{display:none}}

.device-wait{min-height:100vh;text-align:center;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:120px 25px 60px}.hex-number{font:800 clamp(75px,16vw,200px) ui-monospace,monospace;letter-spacing:.03em;line-height:1.3;color:#284add}.device-wait h1{font-size:30px;margin:15px 0}.health-pills{display:flex;gap:12px;margin:30px}.health-pills span{background:#e8eddd;border:1px solid #d3dcc4;border-radius:30px;padding:10px 20px;font-size:13px}.station-facing{font-size:25px;float:right;color:#284add}.station-chip.offline{opacity:.6;border-style:dashed}.station-chip.fault{border:2px solid #a65039;background:#ffdfd1}

.monitor-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px;margin:20px 0}.monitor-card{display:flex;flex-direction:column;gap:10px;text-align:left;padding:18px;border:1px solid #d5d5c8;border-radius:16px;background:#f7f8ef;color:#222;min-height:185px}.monitor-card strong{font-size:27px}.monitor-card span,.monitor-card small{line-height:1.5}.monitor-card.needs-attention{background:#fff0dc;border-color:#be7332}.monitor-card[aria-pressed=true]{outline:3px solid #6452a0}.monitor-events{max-height:300px;overflow:auto;line-height:1.9}.monitor-events time{font-family:monospace;margin-right:12px}#monitor-summary{margin-top:20px;font-weight:600}#monitor-detail:not(:empty){border-top:1px solid #ccc;padding-top:20px}
.screen-wall{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px;margin:20px 0}.screen-tile{border:1px solid #ccc;border-radius:12px;padding:12px;text-align:left;background:#f7f8ef;color:#222}.screen-picture{aspect-ratio:16/9;background:#24262a;display:flex;align-items:center;justify-content:center;color:white;margin:10px 0;overflow:hidden}.screen-picture img{width:100%;height:100%;object-fit:contain}.screen-picture span{padding:15px;font-size:13px}.screen-tile small{display:block;line-height:1.5}#screen-enlarge{max-width:1400px;width:92vw}
/* The learning surface gives one task visual priority; OS help remains reachable. */
.lesson{max-width:1040px;margin:0 auto}.lesson header{margin-bottom:24px}.lesson header h1{font-size:clamp(25px,3.5vw,42px);margin:10px 0}.lesson header>p:last-child{color:#65705f;font-size:13px}.lesson-body{display:grid;gap:22px}.lesson-instruction{padding:22px;background:#fffdf5;border:1px solid var(--line);border-radius:18px}.lesson-bridge{font-size:15px;line-height:1.8;color:#526049;max-width:65ch}.lesson-instruction h2{font-size:22px;line-height:1.5;margin:15px 0}.lesson-hint{line-height:1.7;color:#56644c;font-size:14px}.lesson-machine{border:1px solid #cad2bd;background:#eaf0de;padding:28px 20px;border-radius:20px;text-align:center;min-width:0}.lesson-bits{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin:15px 0 24px}.lesson-bit{background:#fffdf5;border:2px solid #bec9b0;border-radius:14px;min-width:70px;min-height:105px;padding:12px;display:grid;gap:7px;justify-items:center}.lesson-bit[aria-pressed=true]{background:#d4f76b;border-color:#53663b}.lesson-bit:disabled{opacity:1}.lesson-bit strong{font:22px ui-monospace,monospace}.lesson-bit small{font-size:11px}.lamp{display:block;width:22px;height:22px;background:#40483d;border-radius:50%;border:3px solid #627156}.lamp.lit{background:#e8ff97;box-shadow:0 0 0 4px #c1d697}.lesson-choices{display:flex;justify-content:center;gap:12px;margin:20px 0}.lesson-choices button{border:2px solid #a9b899;background:#fffdf5;padding:16px 28px;border-radius:12px;font-size:26px}.lesson-choices button.selected{background:#d4f76b;border-color:#34472c}.lesson-actions{display:flex;gap:15px;align-items:center;margin:24px 0;flex-wrap:wrap}.lesson-feedback{margin-top:20px;border-left:5px solid #667c45;background:#fffdf5;padding:20px;line-height:1.8}.lesson-feedback strong{display:block;font-size:18px}.lesson-feedback p{margin:8px 0}.lesson-sequel{color:#58634f;font-size:14px;margin-bottom:15px}.lesson-counter,.codebooks,.pixel-pair{display:flex;justify-content:center;gap:35px;flex-wrap:wrap;margin-bottom:20px}.lesson-counter strong{display:block;font-size:48px}.pixel-grid{display:grid;grid-template-columns:repeat(2,70px);gap:5px;margin-top:12px}.pixel{display:block;width:70px;height:70px;background:#fffdf5;border:2px solid #7c8b6d;border-radius:8px}.pixel.dark{background:#293b27;color:#fff}.bit-stream{font:20px ui-monospace,monospace;line-height:1.7;overflow-wrap:anywhere}.letter-table{font-size:14px;line-height:1.8;margin-bottom:20px}.codebooks>div{text-align:left;background:#fffdf5;border-radius:12px;padding:16px;line-height:2}.codebooks h3{font-size:14px}.tea-stream{display:grid;gap:12px}.tea-stream strong{font-size:32px}.tea-stream code{font-size:clamp(12px,2.5vw,22px);overflow-wrap:anywhere}.collected{line-height:2}.collected code{background:#fff;padding:6px}.lesson.beside .lesson-body{grid-template-columns:minmax(250px,.8fr) minmax(0,1.2fr)}
@media(max-width:800px){.lesson.beside .lesson-body{grid-template-columns:1fr}.lesson-machine{padding:16px 10px}.lesson-bit{min-width:50px;padding:8px}.lesson-bits{gap:6px}.main:has(.lesson){padding-left:18px;padding-right:18px}.lesson-instruction{padding:16px}}
.learning-focus .tabs{height:36px}.learning-focus .tab{font-size:11px}.learning-focus .topbar{height:64px}.learning-focus .tabs{top:64px}.learning-focus .main{padding-top:120px}.learning-focus .wallet{background:transparent;border-color:transparent;font-size:11px}.learning-focus .top-right{gap:12px}.learning-focus .bottom button{padding:10px;font-size:11px}
.lesson-actions{position:fixed;bottom:62px;left:50%;transform:translateX(-50%);width:min(1040px,calc(100% - 36px));margin:0;padding:12px 0;background:#f5f4ebf5;border-top:1px solid var(--line);z-index:18}.main:has(.lesson){padding-bottom:170px}.signal-path{display:flex;align-items:center;justify-content:center;gap:24px;margin:18px auto 0}.signal-path>div{display:grid;justify-items:center;gap:12px;min-width:90px}.signal-path span{font-size:12px;color:#56644c}.signal-path code{font-size:30px;letter-spacing:.15em}.signal-path .signal-wire{font-size:38px}.receiver-lamp{display:grid;place-items:center;background:#32422b;color:white;border:6px solid #9cab89;border-radius:50%;width:82px;height:82px;font-size:24px}.receiver-lamp.lit{background:#edff9c;color:#293b27;box-shadow:0 0 28px #d4f76b}.receiver-number{font:40px ui-monospace,monospace}.pattern-tree{margin-top:20px;font-size:14px;display:grid;gap:8px}.pattern-tree>div{display:flex;justify-content:center;gap:18px}.pattern-tree b{background:#d4f76b;padding:3px}.pattern-tree code{font-size:17px}

/* Tab strip removed: activity navigation uses the catalog until tabs are complete. */
.main{padding-top:108px}.learning-focus .main{padding-top:90px}
.studio-pair{display:flex;justify-content:center;gap:50px;flex-wrap:wrap;margin:28px 0}.studio-pair h2{font-size:18px;margin-bottom:14px}.art-grid{display:grid;grid-template-columns:repeat(8,30px);gap:3px;border:8px solid #dce5cf;border-radius:12px;background:#dce5cf}.art-pixel{width:30px;height:30px;background:#fffdf5;border:1px solid #bac6a9;border-radius:4px}.art-pixel.dark{background:#293b27}.studio-controls{display:flex;flex-wrap:wrap;gap:15px;align-items:center;margin:24px 0}.art-bytes{display:grid;gap:8px;margin:15px 0}.art-bytes code{font-size:20px;letter-spacing:.15em}.art-bytes small{font:12px Arial;letter-spacing:0;color:#66705e}.studio details{padding:20px;background:#eaf0de;border-radius:14px;line-height:1.7}.studio summary{cursor:pointer;font-weight:700}.studio-pair>div>p{margin-top:10px;font-size:13px}
.teacher-note{position:fixed;right:20px;top:75px;width:min(340px,calc(100vw - 40px));padding:20px;background:#fff9d8;border:2px solid #b8a657;box-shadow:0 8px 30px #0002;border-radius:16px;z-index:30}.teacher-note p{line-height:1.7;margin:12px 0}.cleanup-list{display:grid;gap:15px;margin:30px 0}.cleanup-list button{text-align:left;padding:18px}.cleanup-list button[aria-pressed=true]{background:#d4f76b}