*,*:before,*:after{box-sizing:border-box}body{margin:0;padding:0}body{font-family:Arial,sans-serif;margin:0;padding:0;background-color:#f0f2f5;display:flex;justify-content:center;align-items:center;min-height:100vh}.App{display:flex;flex-direction:column;align-items:center;gap:1.2rem;width:100%;max-width:360px;padding:1.5rem;background-color:#f0f2f5;border-radius:15px;box-shadow:10px 10px 20px #cbced1,-10px -10px 20px #fff;text-align:center}.timer-panel{display:flex;flex-direction:column;align-items:center;gap:.8rem;width:100%}.settings-panel{display:flex;flex-direction:column;align-items:center;gap:1rem;width:100%}.session-title{font-size:1.8rem;color:#707070;margin:0}.timer-display{display:flex;align-items:center;justify-content:center;width:160px;height:160px;font-size:3.2rem;font-weight:700;color:#3498db;background-color:#f0f2f5;border-radius:50%;box-shadow:inset 8px 8px 15px #cbced1,inset -8px -8px 15px #fff}.audio-selector{width:100%}.audio-selector label{display:block;margin-bottom:.4rem;color:#707070;font-weight:500;font-size:.9rem}.controls,.time-settings{display:flex;flex-direction:column;align-items:center;gap:.8rem;width:100%}.time-settings>div{width:100%}.settings-label{display:block;font-weight:500;color:#707070;margin-bottom:.3rem;font-size:.9rem}input[type=number],select{width:100%;max-width:100%;padding:.6rem;font-size:1rem;border:none;border-radius:8px;text-align:center;background-color:#f0f2f5;box-shadow:inset 5px 5px 10px #cbced1,inset -5px -5px 10px #fff;color:#555;margin:.3rem 0}select{-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='7' viewBox='0 0 12 7'%3E%3Cpolyline points='1,1 6,6 11,1' fill='none' stroke='%23707070' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right .8rem center;background-size:12px;padding-right:2.2rem;cursor:pointer}.button-group{display:flex;gap:.8rem;width:100%}button{flex:1;padding:.8rem 1rem;font-size:1rem;background-color:#3498db;color:#fff;border:none;border-radius:10px;cursor:pointer;transition:background-color .3s ease,transform .2s ease;box-shadow:5px 5px 10px #cbced1,-5px -5px 10px #fff}button:hover{background-color:#2980b9;transform:scale(1.05)}button:active{box-shadow:inset 5px 5px 10px #cbced1,inset -5px -5px 10px #fff;transform:scale(.95)}button:disabled{background-color:#bdc3c7;color:#f0f2f5;cursor:not-allowed;box-shadow:none;transform:none}@media(min-width:1024px){.App{flex-direction:row;align-items:stretch;width:760px;max-width:90vw;padding:2.5rem 3rem;gap:0;text-align:left}.timer-panel{flex:1;min-width:0;width:auto;align-items:center;justify-content:center;gap:1rem;padding-right:2.5rem;border-right:1px solid #d5d8db}.session-title{font-size:2rem}.timer-display{width:200px;height:200px;font-size:4rem}.settings-panel{flex:1;min-width:0;width:auto;align-items:stretch;justify-content:center;gap:1.5rem;padding-left:2.5rem}.audio-selector label{font-size:1rem}.audio-selector select{max-width:100%}.controls{align-items:stretch;gap:1.2rem}.time-settings{flex-direction:row;align-items:flex-start;gap:1.5rem}.time-settings>div{flex:1}.settings-label{font-size:1rem}.button-group{width:100%}}