* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    min-height: 100vh;

    display: flex;
    justify-content: center;
    align-items: center;

    font-family: Arial, sans-serif;
    background: #f4f4f4;
}

.container {
    width: 90%;
    max-width: 500px;

    padding: 50px;

    text-align: center;

    background: white;
    border-radius: 16px;

    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.subtitle {
    font-size: 1.2rem;
    color: #666;
}

.number {
    margin: 30px 0;
    font-weight: bold;
}

button {
    padding: 15px 35px;

    font-size: 1.2rem;
    font-weight: bold;

    border: none;
    border-radius: 8px;

    background: #222;
    color: white;

    cursor: pointer;

    transition: transform 0.1s, background 0.2s;
}

button:hover {
    background: #444;
}

button:active {
    transform: scale(0.95);
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.status {
    margin-top: 20px;
    min-height: 20px;
    color: #666;
}