:root{--ink:#142c3b;--muted:#526d78;--line:#c8d6dc;--paper:#fff;--teal:#086b69;--green:#16734a;--red:#a63e3a;--amber:#9a5810;--blue:#345d9d}main.practice-main{max-width:1180px;margin:auto;padding:32px 24px 60px}.practice-home{display:inline-block;margin:4px 0 28px;color:var(--teal);font-weight:700;text-decoration:none}.module-heading{display:flex;justify-content:space-between;gap:36px;align-items:end;margin-bottom:24px}.module-heading h1{font-size:clamp(34px,5vw,54px);line-height:1.03;margin:8px 0}.module-heading .intro{max-width:540px;color:var(--muted);line-height:1.65}.toolbar{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin:20px 0}.toolbar button,.answer-grid button,.primary-action{appearance:none;border:0;border-radius:7px;padding:13px 18px;background:var(--teal);color:white;font:inherit;font-weight:700;cursor:pointer}.toolbar .secondary{background:white;color:var(--ink);border:1px solid var(--line)}.case-count{margin-left:auto;color:var(--muted);font-weight:700}.workspace{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(260px,.7fr);gap:24px;align-items:start}.panel,.reference{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:26px;box-shadow:0 5px 16px #1436480a}.reference{background:#f5f8f9}.reference h2,.panel h2{margin:0 0 14px}.reference ul{padding-left:20px;line-height:1.65}.answer-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:22px 0}.answer-grid.five{grid-template-columns:repeat(2,1fr)}.answer-grid button{background:white;border:1px solid #9db1bb;color:var(--ink)}.answer-grid button:hover,.answer-grid button.selected{border-color:var(--teal);box-shadow:inset 0 0 0 2px var(--teal)}.answer-grid button.correct{background:#dff3e8;border-color:var(--green);color:#135d3d;box-shadow:inset 0 0 0 2px var(--green)}.answer-grid button.wrong{background:#f8e3e1;border-color:var(--red);color:#872c29;box-shadow:inset 0 0 0 2px var(--red)}.primary-action:disabled{opacity:.45;cursor:not-allowed}.feedback{margin-top:18px;border-left:5px solid var(--green);background:#eef8f2;padding:18px;border-radius:6px;line-height:1.55}.feedback.wrong-feedback{border-color:var(--red);background:#fcf0ef}.feedback p{margin:7px 0 0}.value-table{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:18px 0}.value-card{border:1px solid var(--line);border-radius:9px;padding:16px;background:#fbfcfd}.value-card span,.value-card small{display:block;color:var(--muted)}.value-card strong{display:block;font-size:27px;margin:6px 0;color:var(--ink)}.prompt{font-size:19px;font-weight:750;margin:22px 0 6px}.misses-panel{border:1px solid var(--line);background:white;padding:24px;border-radius:10px;margin:18px 0}.miss-card{border-top:1px solid var(--line);padding:15px 0}.wave-wrap{background:#071923;border-radius:10px;padding:14px;overflow:hidden}.wave-wrap svg{display:block;width:100%;height:auto}.timing-label{display:flex;justify-content:space-between;color:#d7e5ea;font-size:12px;margin-top:8px}.legend{display:flex;gap:18px;flex-wrap:wrap;margin:12px 0;color:var(--muted);font-size:14px}.legend i{display:inline-block;width:20px;height:3px;vertical-align:middle;margin-right:6px}.legend .ecg{background:#65dd8b}.legend .art{background:#f4c95d}.legend .assist{background:#56b9ef}@media(max-width:780px){.module-heading{display:block}.workspace{grid-template-columns:1fr}.value-table{grid-template-columns:repeat(2,1fr)}.answer-grid.five{grid-template-columns:1fr}.case-count{margin-left:0}}@media(max-width:480px){main.practice-main{padding:24px 16px}.panel,.reference{padding:19px}.value-table{grid-template-columns:1fr}.answer-grid{grid-template-columns:1fr}}