:root{color-scheme:dark;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100vh;background:#0a0a0a;color:#fafafa}.app{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:2rem;gap:2rem}.header{text-align:center}.header h1{margin:0;font-size:2.5rem;font-weight:800;letter-spacing:-.03em;text-transform:uppercase;background:linear-gradient(135deg,#f44,#f80);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.header p{margin:.25rem 0 0;color:#ffffff73;font-size:.85rem;letter-spacing:.15em;text-transform:uppercase}.timer-display{position:relative;width:280px;height:280px;display:flex;align-items:center;justify-content:center}.timer-ring{position:absolute;top:0;right:0;bottom:0;left:0;transform:rotate(-90deg)}.timer-ring-bg{fill:none;stroke:#ffffff0f;stroke-width:6}.timer-ring-progress{fill:none;stroke-width:6;stroke-linecap:round;transition:stroke .3s}.timer-ring-progress.round{stroke:#f44}.timer-ring-progress.rest{stroke:#2c8}.timer-content{text-align:center;z-index:1}.timer-time{font-size:4.5rem;font-weight:700;font-variant-numeric:tabular-nums;letter-spacing:-.04em;line-height:1}.timer-phase{font-size:.8rem;text-transform:uppercase;letter-spacing:.2em;margin-top:.5rem;font-weight:600}.timer-phase.round{color:#f44}.timer-phase.rest{color:#2c8}.timer-phase.idle{color:#fff6}.round-counter{font-size:1.1rem;color:#ffffff80;margin-top:.25rem}.controls{display:flex;gap:.75rem}.btn{border:none;border-radius:.5rem;padding:.75rem 1.75rem;font-size:.9rem;font-weight:600;letter-spacing:.05em;text-transform:uppercase;cursor:pointer;transition:transform .1s,opacity .2s}.btn:active{transform:scale(.96)}.btn:disabled{opacity:.3;cursor:not-allowed}.btn-primary{background:#f44;color:#fff}.btn-primary:hover:not(:disabled){background:#f55}.btn-secondary{background:#ffffff14;color:#fffc;border:1px solid rgba(255,255,255,.1)}.btn-secondary:hover:not(:disabled){background:#ffffff1f}.settings{display:flex;gap:1.5rem;flex-wrap:wrap;justify-content:center}.setting{display:flex;flex-direction:column;align-items:center;gap:.5rem}.setting-label{font-size:.7rem;text-transform:uppercase;letter-spacing:.15em;color:#fff6}.setting-value{display:flex;align-items:center;gap:.5rem}.setting-btn{width:32px;height:32px;border-radius:50%;border:1px solid rgba(255,255,255,.12);background:#ffffff0a;color:#ffffffb3;font-size:1.1rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .2s}.setting-btn:hover:not(:disabled){background:#ffffff1a}.setting-btn:disabled{opacity:.3;cursor:not-allowed}.setting-number{font-size:1.3rem;font-weight:600;min-width:2.5rem;text-align:center;font-variant-numeric:tabular-nums}.setting-unit{font-size:.65rem;color:#ffffff4d}