body {
    font-family: 'Arial', sans-serif;
    background-color: #e5e5e5;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
    max-width: 900px;
    background-color: #cff6e6;
    padding: 30px;
    border-radius: 16px;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.container:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
}

h1 {
    font-size: 2rem;
    color: #206206;
    margin-bottom: 16px;
    font-weight: 600;
}

p.lead {
    font-size: 1rem;
    color: #ee1010;
    margin-bottom: 24px;
}

#timerDisplay {
    font-size: 1.5rem;
    font-weight: bold;
    color: #011123;
    margin-bottom: 20px;
    padding: 10px 20px;
    background-color: #f0f8ff;
    border-radius: 8px;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

#exerciseMessage {
    font-size: 1.2rem;
    margin-top: 20px;
    color: #555555;
}

button {
    width: 100%;
    max-width: 200px;
    padding: 12px;
    margin-bottom: 10px;
    font-size: 1rem;
    font-weight: 500;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.3s;
}

.btn-primary {
    background-color: #007bff;
    color: #ffffff;
}

.btn-primary:hover {
    background-color: #0056b3;
    transform: translateY(-3px);
}

.btn-success {
    background-color: #169c35;
    color: #ffffff;
}

.btn-success:hover {
    background-color: #053e12;
}

.btn-warning {
    background-color: #ffc107;
    color: #030000;
}

.btn-warning:hover {
    background-color: #e0a800;
}

.btn-danger {
    background-color: #dc3545;
    color: #ffffff;
}

.btn-danger:hover {
    background-color: #44040b;
}

/* Mobil ve küçük ekranlar için */
@media (max-width: 768px) {
    .container {
        padding: 20px;
        max-width: 95%;
        margin: 10px auto;
    }

    h1 {
        font-size: 1.75rem;
    }

    #timerDisplay {
        font-size: 1.3rem;
        padding: 8px 16px;
    }

    button {
        max-width: 100%;
        padding: 10px;
        font-size: 0.95rem;
    
    }
}