body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: #333;
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    text-align: center;
}

.container {
    background-color: #444;
    padding: 2rem 3rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}

h1 {
    color: #DB524D;
}

#timer-display {
    font-size: 6rem;
    font-weight: bold;
    margin: 1rem 0 2rem;
}

.controls button {
    background-color: #DB524D;
    color: white;
    border: none;
    padding: 1rem 2rem;
    margin: 0.5rem;
    font-size: 1.2rem;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.controls button:hover {
    background-color: #b8423c;
}

.controls button:disabled {
    background-color: #888;
    cursor: not-allowed;
}

.settings {
    margin-top: 2rem;
}

.settings label {
    font-size: 1.1rem;
    margin-right: 10px;
}

.settings input {
    padding: 0.5rem;
    font-size: 1rem;
    width: 60px;
    border-radius: 5px;
    border: 1px solid #666;
    background-color: #555;
    color: #fff;
}