*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:#f5f5f7;color:#1d1d1f;line-height:1.5;transition:background .3s,color .3s}body.dark{background:#1c1c1e;color:#f5f5f7}.dark .exercise-card,.dark .program-meta{background:#2c2c2e}.dark .program-meta p{color:#aeaeb2}.dark .toggle-btn{background:#2c2c2e;color:#0a84ff;border-color:#0a84ff}.dark .toggle-container{border-color:#0a84ff}.dark .toggle-btn.active{background:#0a84ff;color:#fff}.dark .exercise-reps,.dark .expand-icon{color:#aeaeb2}.dark .exercise-details{border-top-color:#3a3a3c}.dark .exercise-description{color:#aeaeb2}.dark .app-footer{background:#3a3a3c;color:#ffd60a;border-top-color:#ffd60a}.theme-toggle{position:absolute;top:16px;right:16px;background:none;border:none;font-size:1.4rem;cursor:pointer;padding:4px}.login-container{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:16px}.login-form{width:100%;max-width:360px;background:#fff;border-radius:16px;padding:32px 24px;box-shadow:0 4px 12px #0000001a}.dark .login-form{background:#2c2c2e}.login-form h2{text-align:center;margin-bottom:4px}.login-subtitle{text-align:center;color:#6e6e73;font-size:.875rem;margin-bottom:24px}.login-form label{display:block;font-size:.85rem;font-weight:600;margin-bottom:4px;margin-top:16px}.login-form input[type=text],.login-form input[type=password]{width:100%;padding:12px;border:1px solid #ccc;border-radius:8px;font-size:1rem;box-sizing:border-box}.dark .login-form input[type=text],.dark .login-form input[type=password]{background:#1c1c1e;border-color:#3a3a3c;color:#f5f5f7}.login-form button[type=submit]{width:100%;margin-top:24px;padding:14px;background:#0071e3;color:#fff;border:none;border-radius:10px;font-size:1rem;font-weight:600;cursor:pointer}.login-form button[type=submit]:disabled{opacity:.6;cursor:not-allowed}.login-error{color:#ff453a;font-size:.85rem;margin-top:12px;text-align:center}.app{max-width:640px;margin:0 auto;padding:16px 16px 80px}.app-header{text-align:center;padding:24px 0 16px;position:relative}.app-header h1{font-size:1.5rem;font-weight:700}.subtitle{color:#6e6e73;font-size:.875rem;margin-top:4px}.sign-out-btn{margin-top:8px;padding:6px 12px;background:none;border:1px solid #86868b;border-radius:6px;color:#86868b;font-size:.75rem;cursor:pointer}.toggle-container{display:flex;gap:0;margin:16px 0 24px;border-radius:10px;overflow:hidden;border:2px solid #0071e3}.toggle-btn{flex:1;padding:12px 16px;border:none;background:#fff;font-size:1rem;font-weight:600;cursor:pointer;transition:background .2s,color .2s;color:#0071e3}.toggle-btn.active{background:#0071e3;color:#fff}.program-meta{background:#fff;border-radius:12px;padding:16px;margin-bottom:20px;box-shadow:0 1px 3px #00000014}.program-meta p{font-size:.875rem;margin-bottom:4px;color:#424245}.exercise-section{margin-bottom:24px}.section-title{font-size:1.1rem;font-weight:700;color:#1d1d1f;margin-bottom:12px;padding-left:4px}.exercise-card{background:#fff;border-radius:12px;margin-bottom:8px;box-shadow:0 1px 3px #00000014;overflow:hidden}.exercise-header{display:flex;align-items:center;padding:14px 16px;cursor:pointer;gap:12px}.exercise-number{width:28px;height:28px;border-radius:50%;background:#e8f0fe;color:#0071e3;display:flex;align-items:center;justify-content:center;font-size:.8rem;font-weight:700;flex-shrink:0}.exercise-title-block{flex:1;min-width:0}.exercise-name{font-size:.95rem;font-weight:600;margin:0}.exercise-reps{font-size:.8rem;color:#6e6e73}.expand-icon{color:#86868b;font-size:1rem;flex-shrink:0}.exercise-details{padding:12px 16px 16px;border-top:1px solid #f0f0f0}.exercise-cue{font-size:.875rem;margin-bottom:8px;color:#0071e3}.exercise-description{font-size:.875rem;color:#424245;margin-bottom:12px}.exercise-video{position:relative;width:100%;padding-bottom:56.25%;margin:12px 0;border-radius:8px;overflow:hidden}.exercise-video iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:none}.app-footer{position:fixed;bottom:0;left:0;right:0;background:#fff3cd;padding:12px 16px;text-align:center;font-size:.8rem;color:#856404;border-top:1px solid #ffc107}.timer-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#000000d9;display:flex;align-items:center;justify-content:center;z-index:1000;padding:16px}.timer-card{background:#1c1c1e;border-radius:20px;padding:32px 24px;text-align:center;width:100%;max-width:360px;color:#fff}.timer-exercise-name{font-size:1rem;color:#aeaeb2;margin-bottom:16px}.timer-phase{font-size:2.5rem;font-weight:800;margin-bottom:8px}.timer-countdown{font-size:4rem;font-weight:200;font-variant-numeric:tabular-nums;margin-bottom:12px}.timer-progress{font-size:1rem;color:#aeaeb2;margin-bottom:24px}.timer-side{color:#af52de}.timer-controls{display:flex;gap:12px;justify-content:center}.timer-btn{padding:12px 24px;border-radius:10px;border:none;font-size:1rem;font-weight:600;cursor:pointer;background:#2c2c2e;color:#fff}.timer-btn-stop{background:#3a3a3c;color:#ff453a}.exercise-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:4px}.start-timer-btn{display:inline-block;padding:8px 16px;background:#34c759;color:#fff;border:none;border-radius:8px;font-size:.85rem;font-weight:600;cursor:pointer}@media(min-width:768px){.app{padding:32px}.app-header h1{font-size:2rem}.exercise-header{padding:16px 20px}}