:root{--bg-color:#fcfcfc;--surface-color:#fff;--text-primary:#1d1d1f;--text-secondary:#86868b;--accent-color:#0071e3;--border-color:#e5e5ea;--success-color:#34c759;--shadow-sm:0 1px 2px #0000000d;--shadow-md:0 4px 6px #0000000d, 0 1px 3px #0000001a;--border-radius:12px}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);color:var(--text-primary);-webkit-font-smoothing:antialiased;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.5}#root{flex-direction:column;max-width:600px;min-height:100vh;margin:0 auto;padding:16px;display:flex}h1{letter-spacing:-.5px;margin-bottom:8px;font-size:28px;font-weight:700}h2{margin-bottom:12px;font-size:20px;font-weight:600}p{color:var(--text-secondary)}.card{background-color:var(--surface-color);border-radius:var(--border-radius);box-shadow:var(--shadow-sm);border:1px solid var(--border-color);margin-bottom:16px;padding:20px}.btn{cursor:pointer;border:none;border-radius:24px;justify-content:center;align-items:center;width:100%;padding:12px 24px;font-size:16px;font-weight:600;transition:all .2s;display:inline-flex}.btn-primary{background-color:var(--accent-color);color:#fff}.btn-primary:hover{background-color:#005bb5}.btn-secondary{color:var(--accent-color);border:1px solid var(--accent-color);background-color:#0000}.btn-success{background-color:var(--success-color);color:#fff}.input-group{flex-direction:column;gap:4px;margin-bottom:12px;display:flex}.input-group label{color:var(--text-secondary);font-size:14px;font-weight:500}input[type=number],input[type=text]{border:1px solid var(--border-color);border-radius:8px;outline:none;padding:12px;font-size:16px;transition:border-color .2s}input:focus{border-color:var(--accent-color)}.exercise-list{flex-direction:column;gap:16px;list-style:none;display:flex}.exercise-item{border-bottom:1px solid var(--border-color);padding-bottom:16px}.exercise-item:last-child{border-bottom:none}.header{justify-content:space-between;align-items:center;margin-bottom:24px;display:flex}.set-row{grid-template-columns:1fr 1fr 1fr;align-items:end;gap:8px;display:grid}nav{border-top:1px solid var(--border-color);background-color:var(--bg-color);justify-content:space-around;margin-top:auto;padding:16px 0;display:flex}.nav-link{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;font-size:14px;font-weight:500;text-decoration:none}.nav-link.active{color:var(--accent-color)}.delete-btn{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;justify-content:center;align-items:center;padding:8px;transition:color .2s;display:flex;position:absolute;bottom:12px;right:12px}.delete-btn:hover{color:#ff3b30}.edit-btn{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;justify-content:center;align-items:center;padding:8px;transition:color .2s;display:flex;position:absolute;bottom:12px;right:48px}.edit-btn:hover{color:var(--accent-color)}