:root {
    --primary-color: #6a11cb;
    --secondary-color: #2575fc;
    --background-color: #f0f2f5;
    --text-color: #333;
    --card-background: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Montserrat', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: var(--text-color);
}

.container {
    text-align: center;
    background-color: var(--card-background);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 30px var(--shadow-color);
    width: 90%;
    max-width: 400px;
}

h1 {
    font-weight: 700;
    margin-bottom: 20px;
}

#timer-display {
    font-size: 5em;
    font-weight: 700;
    margin-bottom: 30px;
    color: var(--primary-color);
}

.buttons button {
    font-size: 1.2em;
    font-weight: 700;
    padding: 15px 30px;
    margin: 10px;
    cursor: pointer;
    border: none;
    border-radius: 50px;
    transition: all 0.3s ease;
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.buttons button:hover {
    background-color: var(--primary-color);
    color: white;
}

.buttons button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

#start-btn {
    background-color: var(--primary-color);
    color: white;
}

#start-btn:hover {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
}