*{margin:0;padding:0;box-sizing:border-box}:root{--primary-color: #ff6b6b;--secondary-color: #4ecdc4;--accent-color: #ffe66d;--background-color: #f7fff7;--text-color: #292f36;--card-background: #ffffff;--border-color: #e7e7e7}[data-theme=dark]{--primary-color: #ff8e8e;--secondary-color: #60e6de;--accent-color: #ffe66d;--background-color: #2c3e50;--text-color: #ecf0f1;--card-background: #34495e;--border-color: #4a5e77}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:var(--background-color);color:var(--text-color);transition:background-color .3s ease,color .3s ease;min-height:100vh}.app-container{max-width:800px;margin:0 auto;padding:20px;min-height:100vh;display:flex;flex-direction:column}.app-header{text-align:center;margin-bottom:30px;padding:20px 0}.app-title{font-size:2.5rem;color:var(--primary-color);margin-bottom:10px}.settings-button{position:absolute;top:20px;right:20px;background:none;border:none;color:var(--text-color);font-size:1.5rem;cursor:pointer;padding:10px;border-radius:50%;transition:background-color .3s ease}.settings-button:hover{background-color:#0000001a}[data-theme=dark] .settings-button:hover{background-color:#ffffff1a}.timer-card{background-color:var(--card-background);border-radius:20px;padding:40px;text-align:center;box-shadow:0 4px 20px #0000001a;margin-bottom:30px;border:1px solid var(--border-color)}.session-type-selector{display:flex;justify-content:center;margin-bottom:30px;gap:10px}.session-type-button{padding:10px 20px;border:2px solid var(--border-color);background-color:transparent;color:var(--text-color);border-radius:50px;cursor:pointer;font-size:1rem;font-weight:500;transition:all .3s ease}.session-type-button.active{background-color:var(--primary-color);border-color:var(--primary-color);color:#fff}.session-type-button:hover:not(.active){border-color:var(--primary-color);color:var(--primary-color)}.timer-display{font-size:5rem;font-weight:700;margin-bottom:30px;color:var(--text-color);transition:color .3s ease}.control-buttons{display:flex;justify-content:center;gap:20px}.control-button{padding:15px 30px;border:none;border-radius:50px;font-size:1.2rem;font-weight:600;cursor:pointer;transition:all .3s ease;min-width:100px}.start-button{background-color:var(--primary-color);color:#fff}.pause-button{background-color:var(--secondary-color);color:#fff}.reset-button{background-color:var(--text-color);color:#fff}.control-button:hover{transform:translateY(-3px);box-shadow:0 6px 20px #0003}.session-indicators{display:flex;justify-content:center;gap:10px;margin-top:30px}.session-indicator{width:15px;height:15px;border-radius:50%;background-color:var(--border-color);transition:background-color .3s ease}.session-indicator.active{background-color:var(--primary-color)}.session-indicator.completed{background-color:var(--secondary-color)}.settings-panel{background-color:var(--card-background);border-radius:20px;padding:30px;margin-bottom:30px;box-shadow:0 4px 20px #0000001a;border:1px solid var(--border-color)}.settings-panel h2{margin-bottom:20px;color:var(--primary-color)}.setting-item{margin-bottom:20px}.setting-item label{display:block;margin-bottom:8px;font-weight:500;color:var(--text-color)}.setting-item input,.setting-item select{width:100%;padding:10px;border:1px solid var(--border-color);border-radius:8px;background-color:var(--background-color);color:var(--text-color);font-size:1rem}.setting-item input:focus,.setting-item select:focus{outline:none;border-color:var(--primary-color)}.settings-buttons{display:flex;gap:10px;margin-top:30px}.settings-buttons button{flex:1;padding:10px;border:none;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s ease}.save-button{background-color:var(--primary-color);color:#fff}.cancel-button{background-color:var(--border-color);color:var(--text-color)}.session-complete-modal{position:fixed;top:0;left:0;right:0;bottom:0;background-color:#00000080;display:flex;justify-content:center;align-items:center;z-index:1000}.modal-content{background-color:var(--card-background);border-radius:20px;padding:40px;text-align:center;box-shadow:0 10px 30px #0000004d;max-width:400px;width:90%}.modal-content h2{color:var(--primary-color);margin-bottom:10px}.modal-content p{margin-bottom:30px;color:var(--text-color)}.next-session-button{padding:15px 30px;background-color:var(--primary-color);color:#fff;border:none;border-radius:50px;font-size:1.2rem;font-weight:600;cursor:pointer;transition:all .3s ease}.next-session-button:hover{transform:translateY(-3px);box-shadow:0 6px 20px #0003}@media (max-width: 768px){.app-container{padding:10px}.app-title{font-size:2rem}.timer-card{padding:20px}.timer-display{font-size:3.5rem}.session-type-selector{flex-wrap:wrap}.control-buttons{flex-direction:column;align-items:center}.control-button{width:100%;max-width:200px}}@media (max-width: 480px){.app-title{font-size:1.8rem}.timer-display{font-size:2.5rem}.settings-button{position:relative;top:0;right:0;margin-bottom:20px}}