/* Center entire page */
body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    background: #eef2f7;
    font-family: "Segoe UI", Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Main container */
.container {
    text-align: center;
    background: white;
    padding: 40px 50px;
    border-radius: 14px;
    box-shadow: 0 6px 24px rgba(0,0,0,0.12);
    width: 350px;
}

/* Logo */
.hero-image {
    width: 128px;
    height: 128px;
    object-fit: contain;
    margin: 0 auto 20px auto;
    display: block;
}

/* Welcome text */
.welcome-text {
    font-size: 1.4rem;
    font-weight: bold;
    margin-bottom: 15px;
    display: block;
}

/* Error text */
.error-text {
    color: #d9534f;
    font-size: 1.1rem;
    margin-bottom: 10px;
    display: block;
}

/* Code input */
.input-code {
    width: 80%;
    padding: 12px;
    font-size: 1.3rem;
    text-align: center;
    border-radius: 8px;
    border: 1px solid #ccc;
    margin-bottom: 20px;
}

/* Number pad */
.number-pad {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 25px;
}

/* Number buttons */
.num-btn {
    font-size: 1.4rem;
    padding: 16px 0;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    color: white;
    background: linear-gradient(135deg, #ff9a3c, #ff6a00);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

    .num-btn:hover {
        transform: translateY(-2px);
        box-shadow: 0 6px 14px rgba(0,0,0,0.15);
    }


/* Go button */
.go-btn {
    width: 100%;
    font-size: 1.5rem;
    padding: 16px 0;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    color: white;
    background: linear-gradient(135deg, #28a745, #1e8c39);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

    .go-btn:hover {
        transform: translateY(-2px);
        box-shadow: 0 6px 14px rgba(0,0,0,0.15);
    }

/* Footer */
.footer {
    margin-top: 20px;
    font-size: 0.9rem;
    color: #666;
}

    .footer a {
        color: #0072ff;
        text-decoration: none;
    }

/* Bigger keypad on mobile */
@media only screen and (max-width: 767px) {

    .container {
        width: 90%;
        padding: 30px 20px;
    }

    .input-code {
        font-size: 1.6rem;
        padding: 16px;
    }

    .number-pad {
        gap: 16px;
    }

    .num-btn {
        font-size: 2rem;
        padding: 22px 0;
        border-radius: 14px;
    }

    .go-btn {
        font-size: 2rem;
        padding: 22px 0;
        border-radius: 14px;
        margin-top: 10px;
    }
}