.lab{max-width:1500px;margin:auto;padding:30px}.lab-heading{display:flex;align-items:center;justify-content:space-between;gap:24px}.lab h1{font-size:2.7rem;line-height:1.1;margin:10px 0}.lab h2{font-size:1.9rem}.lab h3{font-size:1.15rem;margin:24px 0 8px}.lab-heading p{color:var(--muted);margin:8px 0}select{display:block;background:var(--paper);color:var(--ink);border:1px solid var(--line);padding:12px;border-radius:10px;font:inherit;max-width:100%;margin-top:6px}.engine-note{font-size:.875rem;color:var(--muted);border-left:4px solid var(--mint);padding:10px 16px;background:var(--paper)}.workbench{display:grid;grid-template-columns:minmax(300px, .85fr) minmax(400px,1.3fr);gap:25px;align-items:start}.instructions,.coding,.beyond{background:var(--paper);border:1px solid var(--line);border-radius:18px;padding:25px}.instructions p{line-height:1.75}.coding{min-width:0}.editor-header{display:flex;justify-content:space-between;align-items:center;background:#232941;color:#dfe7ff;padding:12px 16px;border-radius:12px 12px 0 0}#saved{font-size:.875rem}textarea{width:100%;display:block;resize:vertical;border:1px solid var(--line);border-radius:9px;background:var(--bg);color:var(--ink);padding:14px;font:16px/1.6 ui-monospace,Consolas,monospace;tab-size:4}#code{min-height:340px;border-radius:0 0 12px 12px;background:#151a2d;color:#e8edff;white-space:pre;overflow:auto}label[for=stdin]{display:block;margin:20px 0 6px}.runbar{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0}.plain{border:0;background:transparent;color:var(--purple);font-weight:700;padding:10px}button:disabled{opacity:.5;cursor:not-allowed}.terminal{background:#101425;color:#bdebcf;border-radius:12px;overflow:hidden}.terminal>div{padding:10px 15px;background:#232941;font-size:.8rem;letter-spacing:.08em}.terminal pre{padding:15px;margin:0;min-height:100px;max-height:380px;overflow:auto;white-space:pre-wrap;overflow-wrap:anywhere;font:16px/1.6 ui-monospace,monospace}details{margin:20px 0;padding:14px;border:1px solid var(--line);border-radius:10px}summary{cursor:pointer;font-weight:800}.lab pre:not(.terminal pre){font:14px/1.7 ui-monospace,monospace;white-space:pre-wrap;overflow-wrap:anywhere;background:var(--bg);padding:14px;border-radius:8px}.muted{font-size:.875rem;color:var(--muted)}.result{border-left:4px solid var(--pink);padding:12px;margin:12px 0;background:var(--bg);border-radius:6px}.result.pass{border-color:var(--mint)}.beyond{margin-top:30px}.lab a,header>a:not(.brand){color:var(--purple)}:focus-visible{outline:3px solid var(--purple);outline-offset:3px}.lab details p{color:var(--muted)}@media(max-width:950px){.workbench{grid-template-columns:1fr}.lab-heading{align-items:start;flex-direction:column}.lab{padding:20px}.coding,.instructions{padding:18px}}@media(max-width:600px){header{gap:12px}header .meter{font-size:.8rem}.lab h1{font-size:2.2rem}.runbar button{padding:11px}#code{min-height:300px}}