:root{
  --paper:#f5f3ec;--surface:#fffdf8;--ink:#1b2420;--muted:#55615a;--line:#d8d5c8;
  --accent:#0d6a4e;--accent-soft:#e0eee7;--warn:#8a5200;--warn-soft:#faefd8;--warn-line:#e6c98f;
  --v24-ink:#c0392b;--v0-ink:#1f6fb8;
  /* mặt bảng mô phỏng giữ tối ở cả hai chế độ, giống bảng của thầy */
  --board:#12302a;--board-2:#1b423a;--board-line:#31594f;--chalk:#eff4ef;--chalk-dim:#a9c0b5;
  --v24:#ff8373;--v0:#74bdff;--sig:#ffd166;--ac:#efb98a;--ok:#62e0a4;--bad:#ff7f73;
  --radius:12px;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --paper:#101613;--surface:#171f1b;--ink:#e7ece8;--muted:#a3b0a8;--line:#2d3933;
  --accent:#62cfa6;--accent-soft:#1a3128;--warn:#f0ba66;--warn-soft:#2d2413;--warn-line:#5b4620;
  --v24-ink:#ff8d7e;--v0-ink:#7cc0ff;
}}
:root[data-theme="dark"]{
  --paper:#101613;--surface:#171f1b;--ink:#e7ece8;--muted:#a3b0a8;--line:#2d3933;
  --accent:#62cfa6;--accent-soft:#1a3128;--warn:#f0ba66;--warn-soft:#2d2413;--warn-line:#5b4620;
  --v24-ink:#ff8d7e;--v0-ink:#7cc0ff;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:400 16px/1.65 "Be Vietnam Pro",system-ui,"Segoe UI",sans-serif}
.wrap{width:100%;max-width:1120px;margin:0 auto;padding:0 16px}
.mono{font-family:"JetBrains Mono",ui-monospace,Consolas,monospace;font-weight:500}
h1,h2,h3{line-height:1.25;margin:0;letter-spacing:-.01em}
button{font:inherit;color:inherit;cursor:pointer}
a{color:var(--accent)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.sim-stage :focus-visible{outline-color:var(--sig)}
.v24{color:var(--v24-ink);font-weight:600}.v0{color:var(--v0-ink);font-weight:600}
.link{background:none;border:0;padding:0;color:var(--accent);text-decoration:underline;text-underline-offset:2px}

/* HERO */
.hero{padding:34px 0 40px}
.eyebrow{margin:0 0 8px;color:var(--muted);font-size:.875rem;font-weight:500}
h1{font-size:clamp(2.1rem,6vw,3.3rem);font-weight:800}
.lead{max-width:62ch;margin:12px 0 24px;font-size:1.05rem;color:var(--muted)}

.circuit{display:grid;grid-template-columns:repeat(7,1fr);gap:10px 0;align-items:stretch;background:var(--board);border-radius:var(--radius);padding:16px;color:var(--chalk)}
.circuit .arrow{display:none}
.node{position:relative;display:flex;flex-direction:column;gap:2px;padding:10px 10px;margin-right:18px;border:1px solid var(--board-line);border-radius:9px;background:var(--board-2);color:var(--chalk);text-decoration:none;min-width:0;transition:border-color .15s,transform .15s}
.node:hover{border-color:var(--sig);transform:translateY(-1px)}
.node small{color:var(--sig);font-size:.72rem;font-weight:600}
.node b{font-size:.92rem;line-height:1.25}
.node span{font-size:.74rem;line-height:1.35;color:var(--chalk-dim)}
.node:not(.rail)::after{content:"";position:absolute;right:-18px;top:50%;width:18px;height:2px;background:var(--sig)}
.node:nth-of-type(7)::after{display:none}
.node:nth-of-type(7){margin-right:0}
.node.brain{border-color:var(--sig)}
.node.rail{grid-column:1/-1;margin:0;flex-direction:row;flex-wrap:wrap;align-items:baseline;gap:4px 10px;border-style:dashed;border-color:var(--v24)}
.node.rail small{color:var(--v24)}

.progress{display:flex;align-items:center;gap:10px;min-width:0}
.progress-bar{width:120px;height:7px;background:var(--line);border-radius:5px;overflow:hidden;flex:none}
.progress-bar span{display:block;height:100%;width:0;background:var(--accent);border-radius:5px;transition:width .3s}
.progress p{margin:0;font-size:.82rem;color:var(--muted);white-space:nowrap}
.progress b{color:var(--ink)}

.legend{display:flex;flex-wrap:wrap;gap:8px 22px;margin:16px 0 0;font-size:.85rem;color:var(--muted)}
.legend div{display:flex;gap:8px;align-items:baseline;flex:1 1 280px}
.legend dt{flex:none}.legend dd{margin:0}
.tag{display:inline-block;padding:1px 9px;border-radius:99px;font-size:.76rem;font-weight:600;white-space:nowrap}
.tag-video{background:var(--line);color:var(--ink)}
.tag-warn{background:var(--warn-soft);color:var(--warn);border:1px solid var(--warn-line)}
.tag-ha{background:var(--accent-soft);color:var(--accent)}

/* THANH TRÊN + TAB */
.top{border-bottom:1px solid var(--line)}
.top-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-top:10px;padding-bottom:10px}
.brand{font-weight:700;color:var(--ink);text-decoration:none;white-space:nowrap}
.tabs{position:sticky;top:0;z-index:20;background:var(--paper);border-bottom:1px solid var(--line)}
.tabs-inner{display:flex;gap:2px;overflow-x:auto;scrollbar-width:none;padding-top:7px;padding-bottom:7px}
.tabs-inner::-webkit-scrollbar{display:none}
.tabs a{display:flex;align-items:center;gap:6px;flex:none;padding:6px 11px;border-radius:7px;color:var(--muted);text-decoration:none;font-size:.88rem;font-weight:500;white-space:nowrap}
.tabs a:hover{color:var(--ink);background:var(--line)}
.tabs a[aria-selected="true"]{background:var(--ink);color:var(--paper)}
.tabs i{width:8px;height:8px;border-radius:50%;border:1.5px solid currentColor;flex:none}
.tabs a.done i{background:var(--accent);border-color:var(--accent)}
.tabs a[aria-selected="true"].done i{background:var(--paper);border-color:var(--paper)}
.panel[hidden]{display:none}
.cta{display:inline-block;padding:10px 18px;border-radius:9px;background:var(--accent);color:var(--surface);font-weight:600;text-decoration:none}
.cta:hover{filter:brightness(1.1)}
.cards-t{font-size:1.25rem;margin:30px 0 12px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:12px}
.card{display:block;padding:12px 15px;background:var(--surface);border:1px solid var(--line);border-radius:10px;color:var(--ink);text-decoration:none;transition:border-color .15s}
.card:hover{border-color:var(--accent)}
.card small{display:flex;justify-content:space-between;gap:8px;color:var(--accent);font-weight:600;font-size:.8rem}
.card b{display:block;margin:2px 0 4px;line-height:1.3}
.card span{font-size:.84rem;color:var(--muted);line-height:1.45;display:block}
.reset-row{margin:14px 0 0;font-size:.85rem}
.lesson-nav{display:flex;justify-content:space-between;gap:10px;margin-top:26px;padding-top:16px;border-top:1px solid var(--line)}
.lesson-nav a{padding:8px 14px;border:1px solid var(--line);border-radius:8px;color:var(--ink);text-decoration:none;font-weight:500;font-size:.92rem;background:var(--surface)}
.lesson-nav a:hover{border-color:var(--accent)}

/* LESSON */
.lesson{padding:32px 0 40px}
.lesson-head{max-width:760px;margin-bottom:20px}
.num{margin:0 0 4px;color:var(--accent);font-weight:600;font-size:.9rem}
h2{font-size:clamp(1.5rem,3.6vw,2.05rem);font-weight:700}
.gist{margin:10px 0 0;font-size:1.06rem}

.media{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:20px;margin-bottom:28px}
.video{position:relative;aspect-ratio:16/9;border-radius:var(--radius);overflow:hidden;background:#000;align-self:start}
.video iframe,.video .facade{position:absolute;inset:0;width:100%;height:100%;border:0}
.facade{padding:0;background:#000;display:block}
.facade img{width:100%;height:100%;object-fit:cover;display:block;opacity:.86;transition:opacity .15s}
.facade:hover img{opacity:1}
.facade .play{position:absolute;left:50%;top:50%;width:68px;height:48px;margin:-24px 0 0 -34px;border-radius:12px;background:#d92c20;display:grid;place-items:center}
.facade .play::before{content:"";border-left:18px solid #fff;border-top:11px solid transparent;border-bottom:11px solid transparent;margin-left:4px}
.marks{list-style:none;margin:0;padding:0;font-size:.9rem;line-height:1.45;align-self:start}
.marks li{display:flex;gap:10px;align-items:baseline;padding:6px 0;border-bottom:1px solid var(--line)}
.marks li:last-child{border-bottom:0}
.marks button{flex:none;background:var(--accent-soft);color:var(--accent);border:0;border-radius:5px;padding:1px 7px;font:500 .8rem "JetBrains Mono",ui-monospace,Consolas,monospace}
.marks button:hover{background:var(--accent);color:var(--surface)}

.notes{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:24px;margin-bottom:28px;align-items:start}
.prose h3{margin-bottom:8px}
.prose p,.prose ul,.prose ol{margin:10px 0}
.prose ul,.prose ol{padding-left:20px}
.prose li{margin:4px 0}
.note-src{font-size:.84rem;color:var(--muted)}
.board{margin:0}
.board img{display:block;width:100%;height:auto;border-radius:9px;background:var(--board)}
.board figcaption{margin-top:6px;font-size:.84rem;color:var(--muted)}
.fig-stack{display:grid;gap:16px}

.tbl{width:100%;border-collapse:collapse;font-size:.92rem;margin:12px 0;line-height:1.45}
.tbl th{text-align:left;font-weight:600;color:var(--muted);font-size:.8rem;border-bottom:1.5px solid var(--line);padding:5px 8px 5px 0}
.tbl td{padding:7px 8px 7px 0;border-bottom:1px solid var(--line);vertical-align:top}
.tbl tr:last-child td{border-bottom:0}
.tbl.compact{font-size:.88rem;margin:6px 0}

.decode{display:flex;align-items:stretch;gap:4px;background:var(--board);color:var(--chalk);padding:12px;border-radius:10px;margin:10px 0}
.decode div{flex:1;display:flex;flex-direction:column;gap:2px;min-width:0}
.decode b{font:700 1.5rem "JetBrains Mono",ui-monospace,Consolas,monospace;color:var(--sig)}
.decode span{font-size:.85rem;font-weight:600;line-height:1.3}
.decode small{font-size:.74rem;color:var(--chalk-dim);line-height:1.35}
.decode i{font:700 1.5rem "JetBrains Mono",monospace;color:var(--chalk-dim);font-style:normal;padding:0 2px}

.addr-explain{display:grid;grid-template-columns:auto auto auto auto;justify-content:start;gap:0 18px;background:var(--board);color:var(--chalk);padding:12px 16px;border-radius:10px;margin:10px 0}
.addr-explain .big{font-size:2rem;font-weight:700;color:var(--sig);line-height:1.2}
.addr-explain .dot{color:var(--chalk-dim)}
.addr-explain small{font-size:.74rem;color:var(--chalk-dim);line-height:1.35;max-width:110px}

details.homework{background:var(--accent-soft);border-radius:9px;padding:10px 14px;margin-top:12px}
details.homework summary{cursor:pointer}
details.homework ol{margin-bottom:2px}

/* BOX */
.box{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px 18px}
.box p{margin:8px 0}
.box h3{font-size:1.02rem;margin-bottom:6px}
.box h3.mt{margin-top:14px}
.box ol{margin:6px 0;padding-left:20px}
.box ol li{margin:4px 0}
.box-warn{background:var(--warn-soft);border-color:var(--warn-line);margin:0 0 20px}
.box-ha{background:var(--accent-soft);border-color:transparent}
.warn-inline{font-size:.92rem}
.two{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:20px;align-items:start}
.done{display:inline-flex;align-items:center;gap:9px;margin-top:18px;padding:9px 16px;border:1.5px solid var(--accent);border-radius:9px;font-weight:600;color:var(--accent);cursor:pointer}
.done input{width:18px;height:18px;accent-color:var(--accent);margin:0}
.done:has(input:checked){background:var(--accent);color:var(--surface)}

/* QUIZ */
.quiz{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px 18px}
.quiz h3{font-size:1.02rem;margin-bottom:4px}
.q{margin-top:12px}
.q>p{margin:0 0 6px;font-weight:600;font-size:.94rem;line-height:1.45}
.q .opt{display:block;width:100%;text-align:left;margin:4px 0;padding:6px 11px;background:transparent;border:1px solid var(--line);border-radius:7px;font-size:.9rem;line-height:1.4}
.q .opt:hover:not(:disabled){border-color:var(--accent)}
.q .opt:disabled{cursor:default;opacity:1}
.q .opt.right{border-color:var(--accent);background:var(--accent-soft);font-weight:600}
.q .opt.wrong{border-color:var(--warn);background:var(--warn-soft)}
.q .why{margin:6px 0 0;font-size:.86rem;color:var(--muted);line-height:1.45}

/* SIM */
.sim{background:var(--board);color:var(--chalk);border-radius:var(--radius);padding:18px;margin-bottom:20px}
.sim-head h3{font-size:1.08rem;color:var(--chalk)}
.sim-head p{margin:4px 0 12px;font-size:.9rem;color:var(--chalk-dim);max-width:76ch;line-height:1.5}
.sim svg{display:block;width:100%;height:auto}
.sim svg text{font-family:"Be Vietnam Pro",system-ui,sans-serif;fill:var(--chalk)}
.sim code{font:500 .85em "JetBrains Mono",ui-monospace,Consolas,monospace;color:var(--sig)}
.status{margin:12px 0 0;padding:9px 13px;border-radius:8px;background:var(--board-2);font-size:.92rem;line-height:1.5;border-left:3px solid var(--chalk-dim);min-height:3.2em}
.status.ok{border-left-color:var(--ok)}
.status.bad{border-left-color:var(--bad)}
.status.warn{border-left-color:var(--sig)}
.controls{display:flex;flex-wrap:wrap;gap:10px 18px;margin:0 0 12px}
.ctl{display:flex;flex-direction:column;gap:4px;min-width:0}
.ctl>span{font-size:.78rem;color:var(--chalk-dim);font-weight:500}
.seg{display:inline-flex;flex-wrap:wrap;background:var(--board-2);border-radius:8px;padding:3px;gap:2px}
.seg button{border:0;background:transparent;color:var(--chalk-dim);padding:5px 11px;border-radius:6px;font-size:.86rem;font-weight:500;white-space:nowrap}
.seg button:hover{color:var(--chalk)}
.seg button[aria-checked="true"]{background:var(--chalk);color:var(--board);font-weight:600}
.btn{border:1.5px solid var(--chalk-dim);background:transparent;color:var(--chalk);border-radius:8px;padding:7px 14px;font-weight:600;font-size:.9rem;touch-action:none;user-select:none;-webkit-user-select:none}
.btn:hover{border-color:var(--chalk)}
.btn.primary{background:var(--ok);border-color:var(--ok);color:#072a1c}
.btn.danger{border-color:var(--bad);color:var(--bad)}
.btn.held,.btn[aria-pressed="true"]{background:var(--sig);border-color:var(--sig);color:#2c2000}
.btn:disabled{opacity:.4;cursor:not-allowed}
.btn-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}

.led{display:inline-block;flex:none;width:11px;height:11px;border-radius:50%;background:#0a1d19;border:1px solid var(--board-line);transition:background .12s,box-shadow .12s}
.led.on{background:var(--sig);border-color:var(--sig);box-shadow:0 0 8px var(--sig)}
.led.g.on{background:var(--ok);border-color:var(--ok);box-shadow:0 0 8px var(--ok)}
.led.r.on{background:var(--bad);border-color:var(--bad);box-shadow:0 0 8px var(--bad)}

/* wires in SVG */
.w{fill:none;stroke-width:2.5;stroke-linecap:round;stroke-linejoin:round;transition:stroke .15s,opacity .15s}
.w.p24{stroke:var(--v24)}.w.p0{stroke:var(--v0)}.w.sig{stroke:var(--sig)}.w.ac{stroke:var(--ac)}.w.dim{stroke:var(--chalk-dim);opacity:.55}
.w.flow{stroke-dasharray:7 6;animation:flow .55s linear infinite}
.w.flow.rev{animation-direction:reverse}
@keyframes flow{to{stroke-dashoffset:-13}}
.fillbody{fill:var(--board-2);stroke:var(--chalk-dim);stroke-width:1.5}
.dimtext{fill:var(--chalk-dim)!important}
.spin{transform-box:fill-box;transform-origin:center;animation:spin .7s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* sim 1 */
.elev{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr) minmax(0,1.15fr) 110px;gap:14px;align-items:stretch}
.col-t{margin:0 0 6px;font-size:.76rem;font-weight:600;color:var(--chalk-dim);letter-spacing:.04em}
.io{display:flex;align-items:center;gap:7px;width:100%;margin:3px 0;padding:5px 8px;background:var(--board-2);border:1px solid transparent;border-radius:6px;text-align:left;font-size:.82rem;line-height:1.3;color:var(--chalk)}
button.io{border-color:var(--chalk-dim)}
button.io:hover{border-color:var(--chalk)}
.plc-col{display:flex;flex-direction:column}
.plcbox{flex:1;display:flex;flex-direction:column;gap:5px;padding:10px;background:var(--board-2);border:1.5px solid var(--sig);border-radius:9px;font-size:.8rem;line-height:1.4}
.plcbox b{font-size:.95rem}
.rule{padding:4px 7px;border-radius:5px;color:var(--chalk-dim);border:1px solid var(--board-line)}
.rule.on{color:#2c2000;background:var(--sig);border-color:var(--sig);font-weight:600}
.shaft-wrap svg{max-height:270px}

/* sim 2 */
.power{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,6fr);gap:18px;align-items:start}
.plcfront{border:2px solid var(--chalk);border-radius:6px;overflow:hidden;font-size:.86rem}
.plcfront>div{padding:12px 14px;display:flex;justify-content:space-between;gap:8px;align-items:center;transition:background .2s,color .2s}
.plcfront>div+div{border-top:1.5px solid var(--chalk-dim)}
.plcfront .mid{padding:22px 14px;background:var(--board-2)}
.plcfront b{font:700 1.15rem "JetBrains Mono",monospace;color:var(--sig)}
.plcfront .burn{background:#5c1a14;color:#ffd9d3;animation:burn .9s ease-in-out infinite alternate}
.plcfront .off{background:#3a3417;color:#f6e7a8}
@keyframes burn{from{box-shadow:inset 0 0 0 #ff7f73}to{box-shadow:inset 0 0 24px #ff7f73}}
.res{list-style:none;margin:0;padding:0;font-size:.9rem;line-height:1.45}
.res li{display:grid;grid-template-columns:22px 1fr;gap:6px;padding:7px 0;border-bottom:1px solid var(--board-line)}
.res li:last-child{border-bottom:0}
.res .ic{font-weight:800;text-align:center}
.res .ok .ic,.res li.ok .ic{color:var(--ok)}
.res li.burn .ic{color:var(--bad)}
.res li.off .ic{color:var(--sig)}

/* sim 3 */
.term-g{margin-bottom:10px}
.term-row{display:grid;grid-template-columns:repeat(8,minmax(0,1fr));gap:4px}
.term{padding:7px 0;background:var(--board-2);border:1px solid var(--board-line);border-radius:5px;color:var(--chalk);font:500 .78rem "JetBrains Mono",ui-monospace,monospace;text-align:center}
.term:hover:not(:disabled){border-color:var(--chalk)}
.term.bit1{background:var(--sig);border-color:var(--sig);color:#2c2000;font-weight:700}
.term.sel{outline:2px solid var(--chalk);outline-offset:1px}
.term:disabled{opacity:.28;cursor:not-allowed}
.addrout{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:14px;margin-top:12px;align-items:stretch}
.addrcard{background:var(--board-2);padding:12px 14px;border-radius:9px;font-size:.88rem;line-height:1.5}
.addrcard .big{font:700 2.1rem "JetBrains Mono",monospace;color:var(--sig);line-height:1.15}
.bits{display:grid;grid-template-columns:repeat(8,minmax(0,1fr));gap:3px;margin:6px 0}
.bits span{display:flex;flex-direction:column;align-items:center;padding:3px 0;background:var(--board);border-radius:4px;font:500 .72rem "JetBrains Mono",monospace;color:var(--chalk-dim)}
.bits span b{font-size:.98rem;color:var(--chalk)}
.bits span.sel{outline:1.5px solid var(--sig)}
.bits span.un{opacity:.28}

/* sim 4 */
.wire-grid{display:grid;grid-template-columns:minmax(0,1fr);gap:8px}
.sim-split{display:grid;grid-template-columns:minmax(0,3fr) minmax(0,2fr);gap:22px;align-items:center}
.sim-split .btn-row{margin-top:0}

/* sim 5 */
.chain{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px 18px}
.chain-t{margin:0 0 8px;font-size:.76rem;font-weight:600;color:var(--chalk-dim);letter-spacing:.04em}
.stage{position:relative;padding:8px 9px;border:1.5px solid var(--board-line);border-radius:8px;background:var(--board-2);font-size:.8rem;line-height:1.3;min-height:60px;color:var(--chalk-dim);transition:border-color .15s,background .15s,color .15s;transition-delay:calc(var(--i)*110ms)}
.stage b{display:block;font-size:.87rem;color:inherit}
.stage.on{border-color:var(--sig);color:var(--chalk);background:#2d4d33}
.stage.on b{color:var(--sig)}
.stage.trip{border-color:var(--bad);background:#5c1a14;color:#ffd9d3;transition-delay:0s}
.stage.trip b{color:#ffd9d3}
.stage:not(:last-child)::after{content:"";position:absolute;right:-18px;top:50%;width:18px;height:2px;background:var(--board-line)}
.chain .stage:nth-child(4n)::after{display:none}
.chain.p .stage:nth-child(4n)::after{display:block}
.chain.p .stage:last-child::after{display:none}
.motorline{display:grid;grid-template-columns:minmax(0,1fr) 150px;gap:18px;margin-top:16px;align-items:center}
.chain.p{grid-template-columns:repeat(5,minmax(0,1fr))}
.heat{height:7px;border-radius:4px;background:var(--board);overflow:hidden;margin-top:12px}
.heat span{display:block;height:100%;width:0;background:var(--bad);transition:width 1.4s linear}
.star{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:18px;align-items:center}

/* sim 6 */
.sens{display:grid;grid-template-columns:minmax(0,3fr) minmax(0,2fr);gap:16px;align-items:start}
.matrix{width:100%;border-collapse:collapse;font-size:.84rem;line-height:1.35}
.matrix th{padding:5px;font-weight:600;color:var(--chalk-dim);text-align:center}
.matrix td{padding:8px 5px;text-align:center;background:var(--board-2);border:2px solid var(--board);border-radius:6px;color:var(--chalk-dim)}
.matrix td.good{color:var(--ok)}
.matrix td.cur{outline:2px solid var(--chalk);outline-offset:-2px;color:var(--chalk);font-weight:600}

/* sim 7 */
.mem3{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,2.3fr) minmax(0,1fr);gap:16px;align-items:center}
.memplc{border:2px solid var(--chalk);border-radius:7px;overflow:hidden}
.memrow{display:grid;grid-template-columns:62px 30px minmax(0,1fr);gap:10px;align-items:center;padding:11px 13px;font-size:.85rem;line-height:1.4;transition:background .15s}
.memrow+.memrow{border-top:1.5px solid var(--chalk-dim)}
.memrow.mid{background:var(--board-2)}
.memrow code{font-size:1rem;font-weight:700}
.bitv{display:grid;place-items:center;width:28px;height:28px;border-radius:5px;background:var(--board);border:1px solid var(--board-line);font:700 .95rem "JetBrains Mono",monospace;color:var(--chalk-dim)}
.bitv.on{background:var(--sig);border-color:var(--sig);color:#2c2000}
.memside{display:flex;flex-direction:column;gap:9px;align-items:stretch;font-size:.82rem;color:var(--chalk-dim);text-align:center}
.memside .btn{width:100%}
.loadmark{display:flex;flex-direction:column;align-items:center;gap:6px;color:var(--chalk)}
.loadmark .bulb{width:46px;height:46px;border-radius:50%;background:var(--board-2);border:2px solid var(--chalk-dim);transition:background .15s,box-shadow .15s}
.loadmark .bulb.on{background:var(--ok);border-color:var(--ok);box-shadow:0 0 16px var(--ok)}
.rule-line{margin:12px 0 0;font-size:.9rem;color:var(--chalk-dim)}
.mapw{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:18px;align-items:start}
.tagt{width:100%;border-collapse:collapse;font-size:.86rem;line-height:1.35}
.tagt td{padding:6px 7px 6px 0;border-bottom:1px solid var(--board-line);vertical-align:middle}
.tagt tr:last-child td{border-bottom:0}
.tagt .sw{display:inline-block;width:11px;height:11px;border-radius:3px;margin-right:6px;vertical-align:-1px}
.tagt select{font:500 .84rem "JetBrains Mono",ui-monospace,monospace;background:var(--board-2);color:var(--chalk);border:1px solid var(--chalk-dim);border-radius:5px;padding:3px 4px}
.tagt .val{font:700 .95rem "JetBrains Mono",monospace;color:var(--sig);text-align:right;white-space:nowrap}
.tagt .btn{padding:3px 9px;font-size:.8rem;touch-action:auto}
.mgrid{display:grid;grid-template-columns:44px repeat(8,minmax(0,1fr));gap:3px;font:500 .74rem "JetBrains Mono",monospace;text-align:center}
.mgrid .h{color:var(--chalk-dim);align-self:center}
.mcell{aspect-ratio:1/1;display:grid;place-items:center;border-radius:4px;background:var(--board);border:1.5px solid var(--board-line);color:var(--chalk-dim);font-weight:700;font-size:.8rem}
.mcell.bad{background:#7a2019;border-color:var(--bad);color:#ffe3df}
.presets{display:flex;flex-wrap:wrap;gap:7px;margin:0 0 12px}
.presets .btn{padding:5px 11px;font-size:.84rem;touch-action:auto}
.bytecount{display:grid;grid-template-columns:repeat(8,minmax(0,1fr));gap:4px;margin-top:10px}
.range-row{display:flex;flex-wrap:wrap;align-items:center;gap:12px;font-size:.92rem}
.range-row input{flex:1 1 200px;accent-color:var(--sig)}

/* QUICK */
.quick-grid .span2{grid-column:span 2}
.quick-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;align-items:start}
.credit{margin-top:28px;font-size:.84rem;color:var(--muted)}
.credit p{margin:6px 0;max-width:90ch}

@media (max-width:1000px){
  .circuit{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px 18px}
  .node{margin-right:0}
  .node:not(.rail)::after{display:none}
  .node.brain{order:0}
  .node.rail{grid-column:1/-1}
  .quick-grid{grid-template-columns:minmax(0,1fr)}
  .quick-grid .span2{grid-column:auto}
  .elev{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .shaft-wrap{grid-column:2;grid-row:1}
  .shaft-wrap svg{margin:0 auto}
  .elev .plc-col,.elev .out-col{grid-column:1/-1}
}
@media (max-width:760px){
  .media,.notes,.two,.power,.addrout,.sens,.star,.sim-split,.mem3,.mapw{grid-template-columns:minmax(0,1fr)}
  .lesson{padding:24px 0 28px}
  .progress-bar{display:none}
  .brand{font-size:.92rem}
  .sim{padding:14px;margin-left:-4px;margin-right:-4px}
  .hero{padding-top:30px}
  .chain,.chain.p{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px 18px}
  .chain .stage::after{display:none!important}
  .motorline{grid-template-columns:minmax(0,1fr)}
  .motorline svg{max-width:130px;margin:0 auto}
  .decode{flex-direction:column}.decode i{display:none}
  .term{font-size:.7rem}
  .tbl{font-size:.86rem}
}
@media (prefers-reduced-motion:reduce){
  .w.flow,.plcfront .burn{animation:none}
  .w.flow{stroke-dasharray:none}
  .spin{animation-duration:3s}
  .stage{transition-delay:0s}
}
@media print{.tabs,.sim,.done,.progress,.video,.lesson-nav{display:none}}