:root{--primary:#0f172a;--secondary:#334155;--accent:#2563eb;--bg:#f8fafc;--card:#fff;--text:#1e293b;--border:#cbd5e1;--banner:#e2e8f0}
*{box-sizing:border-box}body{font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;font-size:18px;line-height:1.6;color:var(--text);background:var(--bg);margin:0}
#scorm-bar{height:6px;background:#ddd;position:sticky;top:0;z-index:20}#scorm-bar-inner{height:100%;width:0;background:var(--accent);transition:.3s}
header{background:var(--primary);color:#fff;padding:1.2rem 2rem;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap}
.disclaimer{background:var(--banner);border-left:5px solid var(--primary);padding:.9rem 2rem;font-size:15px}
.container{max-width:1240px;margin:1.5rem auto;padding:0 1.2rem;display:grid;grid-template-columns:320px 1fr;gap:1.5rem}
@media(max-width:900px){.container{grid-template-columns:1fr}}
nav.sidebar{background:var(--card);border:1px solid var(--border);border-radius:8px;padding:1rem;max-height:80vh;overflow:auto;position:sticky;top:12px}
.lesson-list{list-style:none;padding:0;margin:0}.lesson-item{padding:.65rem .8rem;margin-bottom:.4rem;border-radius:6px;cursor:pointer;background:#f1f5f9;font-size:14px}
.lesson-item.active{background:var(--accent);color:#fff;font-weight:700}.lesson-item.locked{opacity:.45;cursor:not-allowed}
.lesson-item.completed{border-left:4px solid #16a34a}
main.content-area{background:var(--card);border:1px solid var(--border);border-radius:8px;padding:2rem;min-height:620px;display:flex;flex-direction:column;justify-content:space-between}
.meta{font-size:13px;color:#64748b;margin-top:4px}
.interactive-box{background:#f8fafc;border:2px dashed var(--accent);padding:1.2rem;border-radius:8px;margin-top:1.2rem}
textarea,input[type=text]{width:100%;padding:.7rem;border:1px solid var(--border);border-radius:6px;margin-top:.5rem;font-size:16px}
.btn-group{display:flex;justify-content:space-between;margin-top:2rem;border-top:1px solid var(--border);padding-top:1.2rem;align-items:center}
button.action{background:var(--primary);color:#fff;border:0;padding:.7rem 1.3rem;border-radius:6px;cursor:pointer;font-size:16px}
button.action:disabled{background:#94a3b8;cursor:not-allowed}
.resources{background:#eff6ff;border:1px solid #bfdbfe;padding:.9rem;border-radius:6px;font-size:15px;margin-top:1rem}
label.opt{display:block;background:#fff;border:1px solid var(--border);padding:.5rem .7rem;border-radius:6px;margin:.4rem 0;cursor:pointer}
label.opt:hover{background:#f1f5f9}
.badge{display:inline-block;background:#e0e7ff;color:#3730a3;padding:2px 8px;border-radius:999px;font-size:11px;margin-right:6px}
#completion{margin-top:1rem;padding:1rem;background:#f0fdf4;border:1px solid #bbf7d0;border-radius:8px;display:none}