.course-lock{
  position:fixed; inset:0; z-index:9999; display:grid; place-items:center;
  background:rgba(12,24,36,.72); backdrop-filter:blur(8px); padding:18px;
}
.course-lock-card,.course-exam-card,.course-diploma-card{
  width:min(920px,100%); background:#fffdf8; border-radius:22px; padding:24px;
  box-shadow:0 28px 80px rgba(0,0,0,.34); color:#173c32;
}
.course-lock-card h1,.course-exam-card h2{font:700 clamp(26px,4vw,42px) Georgia,serif;margin:0 0 8px;color:#173c32}
.course-lock-card p,.course-exam-card p{line-height:1.55;color:#66746e;margin:8px 0 0}
.course-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}
.course-btn{
  border:0; border-radius:12px; padding:12px 16px; font-weight:900; cursor:pointer;
  background:#173c32; color:#fff; text-decoration:none; display:inline-flex; align-items:center; gap:8px;
}
.course-btn.secondary{background:#efa93b;color:#173c32}
.course-btn.ghost{background:#f1ece4;color:#173c32}
.course-exam-card{
  margin:28px auto; box-shadow:0 18px 46px rgba(23,54,46,.13); border:1px solid #eadfcd;
}
.course-exam-head{display:flex;justify-content:space-between;gap:12px;align-items:flex-start;flex-wrap:wrap}
.course-score-pill{background:#eef4ef;color:#173c32;border-radius:999px;padding:8px 12px;font-weight:900}
.course-progress{height:12px;border-radius:999px;background:#eee5d6;overflow:hidden;margin:16px 0}
.course-progress i{display:block;height:100%;width:0;background:linear-gradient(90deg,#59b184,#efa93b);transition:.2s}
.course-question{font-size:20px;font-weight:900;color:#173c32;line-height:1.35;margin:12px 0}
.course-choices{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:12px}
.course-choice{
  border:2px solid #e3d7c7;background:#fff;border-radius:14px;padding:14px;text-align:left;
  font-weight:800;color:#173c32;cursor:pointer;line-height:1.35;
}
.course-choice:hover{border-color:#efa93b}
.course-choice.ok{border-color:#59b184;background:#edf8f1}
.course-choice.no{border-color:#d66d62;background:#fff0ee}
.course-choice:disabled{cursor:default}
.course-feedback{min-height:44px;margin-top:12px;padding:12px 14px;border-radius:14px;background:#f1ece4;color:#4e5d57;line-height:1.45}
.course-visual{margin:12px 0;background:#fff;border:1px solid #eadfcd;border-radius:16px;padding:14px;overflow:auto;text-align:center}
.course-visual svg{max-width:100%;height:auto}
.course-pass{border-left:5px solid #59b184;background:#eef8f1}
.course-fail{border-left:5px solid #d66d62;background:#fff0ee}
.course-existing-complete{display:none!important}
.course-index-locked .card{filter:grayscale(.45);opacity:.68}
.course-index-locked .node{filter:grayscale(.7);opacity:.72}
.course-lock-badge{display:inline-flex;gap:5px;align-items:center;margin-left:auto;background:#f1ece4;color:#675f56;border-radius:999px;padding:5px 9px;font-size:11px;font-weight:900}
.course-exam-link{display:inline-flex;margin-top:10px;padding:8px 11px;border-radius:999px;background:#fff2cf;color:#173c32;font-weight:900;text-decoration:none}
@media(max-width:720px){.course-choices{grid-template-columns:1fr}.course-exam-card{padding:18px}}