:root{color-scheme:dark;--bg:#020910;--panel:#06141e;--line:#173848;--text:#e9f9ff;--muted:#88a5b5;--cyan:#3bddff;--amber:#ffb44d;--violet:#aa8cff;--green:#49efaa;--red:#ff6d6d}*{box-sizing:border-box}body{margin:0;background:radial-gradient(circle at 55% -10%,#0b2c3d,#04101a 42%,var(--bg) 76%);color:var(--text);font:14px Arial,sans-serif}header{height:58px;padding:0 clamp(16px,4vw,64px);display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{color:var(--text);font-weight:800;letter-spacing:.16em;text-decoration:none}.brand b,.eyebrow{color:var(--cyan)}nav{display:flex;gap:28px}nav a{color:var(--muted);font-size:13px;text-decoration:none}nav a:hover{color:var(--text)}main{width:min(1560px,95vw);margin:auto}.intro{padding:30px 0 22px;display:flex;align-items:end;justify-content:space-between;gap:24px}.eyebrow{font:700 11px monospace;letter-spacing:.18em;margin:0 0 10px}.intro h1{font-size:clamp(34px,4.5vw,60px);line-height:1;margin:0 0 12px}.intro>div>p:last-child{max-width:760px;margin:0;color:var(--muted);line-height:1.55}.status{display:flex;gap:13px;align-items:center;padding:13px 18px;border:1px solid var(--line);border-radius:9px;background:#061722}.status i{width:8px;height:8px;border-radius:50%;background:var(--green);box-shadow:0 0 12px var(--green)}.status i.paused{background:var(--amber);box-shadow:none}.status span{display:grid;gap:3px}.status small,.metrics small{font:700 9px monospace;color:var(--muted);letter-spacing:.12em}.status strong{font:600 12px monospace}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 330px;border:1px solid var(--line);background:#04111b}.stage{min-width:0;border-right:1px solid var(--line)}.canvas-wrap{aspect-ratio:16/8.5;background:#071925;position:relative;overflow:hidden}#scene{width:100%;height:100%;display:block}.hint{position:absolute;left:14px;bottom:8px;margin:0;padding:7px 10px;border-radius:5px;background:#020910d9;color:var(--muted);font-size:11px;pointer-events:none}.legend,.transport{min-height:47px;padding:8px 14px;display:flex;align-items:center;gap:14px;border-top:1px solid var(--line);flex-wrap:wrap}.legend{font-size:11px;color:var(--muted)}.legend span{display:flex;align-items:center;gap:7px}.legend i{width:18px;height:3px}.ray{background:var(--cyan)}.virtual{border-top:2px dashed var(--violet)}.sight{border-top:1px dotted var(--muted)}.layer{background:linear-gradient(90deg,var(--amber),var(--cyan))}button,select{font:inherit;color:var(--text);background:#0a202d;border:1px solid #1d4354;border-radius:6px;padding:8px 11px;cursor:pointer;white-space:nowrap}button:hover,select:hover{border-color:#357089}.primary{background:var(--cyan);border-color:var(--cyan);color:#001018;font-weight:700}aside{background:linear-gradient(180deg,#071924,#04111a);max-height:735px;overflow:auto}aside section{padding:17px 18px;border-bottom:1px solid var(--line)}aside h2{margin:0 0 14px;font-size:12px;text-transform:uppercase;letter-spacing:.11em}aside label:not(.check){display:grid;grid-template-columns:1fr auto;gap:7px;margin:12px 0;color:var(--muted);font-size:11px}aside output{font:11px monospace;color:var(--text)}aside input[type=range]{grid-column:1/-1;width:100%;accent-color:var(--cyan)}.select{grid-template-columns:1fr!important}.select select,.wide{width:100%}.check{display:flex;align-items:center;gap:9px;margin:10px 0;color:var(--muted);font-size:11px}.check input{accent-color:var(--cyan)}.metrics{display:grid;grid-template-columns:repeat(5,1fr);border:1px solid var(--line);border-top:0;background:var(--panel)}.metrics article{min-height:94px;padding:16px;border-right:1px solid var(--line);display:flex;flex-direction:column;justify-content:center;gap:6px}.metrics article:last-child{border:0}.metrics strong{font:600 17px monospace}.metrics p{margin:0;color:var(--muted);font-size:10px}.lesson{margin:26px 0 12px;padding:25px 28px;display:grid;grid-template-columns:.75fr 1.5fr .75fr;gap:30px;align-items:center;border-left:2px solid var(--cyan);background:var(--panel)}.lesson h2{margin:0}.lesson>p{color:var(--muted);line-height:1.65}.formula{display:grid;gap:8px;color:var(--cyan);font:17px Georgia,serif}.disclaimer{text-align:center;color:var(--muted);font-size:11px;margin:18px}footer{text-align:center;padding:22px;border-top:1px solid #102b39;color:#547180;font-size:11px}@media(max-width:1100px){.workspace{grid-template-columns:1fr}.stage{border:0}aside{display:grid;grid-template-columns:repeat(2,1fr);max-height:none}.metrics{grid-template-columns:repeat(3,1fr)}.lesson{grid-template-columns:1fr}}@media(max-width:700px){nav{gap:10px}.brand{font-size:11px}.intro{flex-direction:column;align-items:start}.status{width:100%;justify-content:space-between}.canvas-wrap{aspect-ratio:4/3}aside{grid-template-columns:1fr}.metrics{grid-template-columns:repeat(2,1fr)}.transport{gap:6px}nav a:nth-child(3){display:none}}@media(max-width:430px){.metrics{grid-template-columns:1fr}.hint{display:none}}