:root{--bg: #f4f7f2;--panel: #ffffff;--ink: #1e2a1e;--accent: #2f7d32;--accent-soft: #e3f1e2;--fail: #b3261e;font-family:system-ui,-apple-system,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink)}.layout{display:grid;grid-template-columns:260px 1fr;min-height:100vh}.sidebar{background:var(--panel);border-right:1px solid #dde5da;padding:16px;overflow-y:auto}.sidebar h1{font-size:1.3rem;margin:0 0 4px}.sidebar h2{font-size:.85rem;text-transform:uppercase;letter-spacing:.04em;color:#567;margin:16px 0 6px}.sidebar ul{list-style:none;margin:0;padding:0}.sidebar li button{width:100%;text-align:left;background:none;border:none;padding:6px 8px;border-radius:8px;cursor:pointer;font-size:.9rem}.sidebar li button:hover{background:var(--accent-soft)}.sidebar li button.active{background:var(--accent-soft);font-weight:600}.xp{font-weight:700;color:var(--accent);margin:0}.workbench{padding:20px 24px}.workbench header h2{margin:0 0 6px}.prompt{white-space:pre-wrap;background:var(--panel);border:1px solid #dde5da;border-radius:10px;padding:12px 14px;max-width:900px}.editor-row{display:flex;gap:20px;margin-top:16px;flex-wrap:wrap}.editor-col{flex:1 1 420px;min-width:320px}.editor{width:100%;height:320px;font-family:SF Mono,Menlo,Consolas,monospace;font-size:14px;line-height:1.5;padding:12px;border:1px solid #cfd8cc;border-radius:10px;background:#fbfdf9;resize:vertical;-moz-tab-size:4;tab-size:4}.controls{display:flex;gap:8px;margin-top:10px;flex-wrap:wrap;align-items:center}.controls button{padding:8px 14px;border-radius:8px;border:1px solid #cfd8cc;background:var(--panel);cursor:pointer}.controls .run{background:var(--accent);color:#fff;border:none;font-weight:700}.controls .run:disabled{opacity:.6}.feedback{margin-top:12px;padding:10px 14px;border-radius:10px}.feedback.pass{background:var(--accent-soft);border:1px solid var(--accent)}.feedback.fail{background:#fdeceb;border:1px solid var(--fail);white-space:pre-wrap}.stdout{background:#10231a;color:#b9f0c8;padding:10px 14px;border-radius:10px;overflow-x:auto}.city-col{flex:0 0 auto}.city-canvas{border:3px solid #6b8f5a;border-radius:10px;background:#a7d78a;max-width:100%}.stats{display:flex;gap:14px;margin-top:8px;font-weight:600;flex-wrap:wrap}.join{margin-top:24px;border-top:1px solid #dde5da;padding-top:12px}.join input,.join select{width:100%;margin:6px 0;padding:7px;border-radius:8px;border:1px solid #cfd8cc}.status{color:var(--fail);font-size:.85rem}.hints em{display:block;font-size:.85rem;color:#456}.joined{font-size:.9rem;color:#456}.teacher-page{max-width:760px;margin:0 auto;padding:24px}.card{background:var(--panel);border:1px solid #dde5da;border-radius:10px;padding:16px;margin:16px 0}.card input,.card select{display:block;width:100%;margin:6px 0;padding:7px;border-radius:8px;border:1px solid #cfd8cc}.card button{padding:8px 14px;border-radius:8px;border:1px solid #cfd8cc;background:var(--accent-soft);cursor:pointer;margin-top:6px}.card table{width:100%;border-collapse:collapse;margin-top:10px}.card th,.card td{text-align:left;padding:4px 8px;border-bottom:1px solid #eef2ec}.seat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:8px;margin:10px 0}.seat-grid code{border:1px dashed #9ab08e;border-radius:6px;padding:6px;text-align:center}.avatar-row{display:flex;flex-wrap:wrap;gap:4px;margin:6px 0}.avatar-row .avatar{font-size:1.2rem;padding:4px 8px;border-radius:8px;border:1px solid transparent;background:none;cursor:pointer}.avatar-row .avatar.active{border-color:var(--accent);background:var(--accent-soft)}.persona-preview{margin:8px 0 4px;font-size:1rem}.persona-pickers{display:flex;gap:4px;flex-wrap:wrap}.persona-pickers select{flex:1 1 30%;min-width:90px;margin:0}