:root{color-scheme:dark;--bg:#0b1220;--panel:#111827;--panel2:#172033;--text:#f8fafc;--muted:#94a3b8;--border:#243045;--accent:#22c55e;--accent-dark:#16a34a}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--text)}button,input,select{font:inherit}.app{max-width:720px;margin:0 auto;padding:16px}.topbar,.exercise-head,.section-title,.nav-actions{display:flex;gap:12px;align-items:center;justify-content:space-between}.topbar{margin-bottom:16px}h1,h2,h3,p{margin-top:0}h1{font-size:1.7rem;margin-bottom:0}h2{font-size:1.45rem;margin-bottom:0}h3{margin-bottom:0}.eyebrow,.muted,.hint{color:var(--muted)}.eyebrow{font-size:.78rem;text-transform:uppercase;letter-spacing:.08em;margin-bottom:4px}.card{background:var(--panel);border:1px solid var(--border);border-radius:18px;padding:16px;margin-bottom:14px}.badge{border:1px solid var(--border);border-radius:999px;padding:6px 10px;color:var(--muted);font-size:.9rem;white-space:nowrap}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:18px}label{display:flex;flex-direction:column;gap:6px;color:var(--muted);font-size:.92rem}input,select{width:100%;background:var(--panel2);color:var(--text);border:1px solid var(--border);border-radius:12px;padding:13px;font-size:1rem}.series-box{display:flex;flex-direction:column;gap:6px;color:var(--muted)}.series-box strong{display:flex;align-items:center;justify-content:center;min-height:49px;background:var(--panel2);border:1px solid var(--border);border-radius:12px;color:var(--text);font-size:1.25rem}button{border:0;border-radius:14px;min-height:48px;padding:12px 16px;cursor:pointer}.primary{width:100%;margin-top:16px;background:var(--accent);color:#052e16;font-weight:800;font-size:1.05rem}.primary:active{background:var(--accent-dark)}.secondary{background:var(--panel2);color:var(--text);border:1px solid var(--border)}.hint{text-align:center;font-size:.83rem;margin:8px 0 0}.rest{text-align:center}.timer{font-size:3.4rem;font-weight:800;letter-spacing:.04em;margin:8px 0}.hidden{display:none}.history{display:flex;flex-direction:column;gap:8px;margin-top:12px}.history-item{display:flex;justify-content:space-between;gap:10px;background:var(--panel2);border-radius:12px;padding:10px 12px}.nav-actions button{flex:1}button:disabled{opacity:.4;cursor:not-allowed}@media(max-width:480px){.app{padding:12px}.topbar{align-items:flex-end}.topbar select{width:auto;max-width:45%}.exercise-head{align-items:flex-start}}

.backup{margin-top:14px}.backup button{width:100%}