body {
    background: url('Image/BG.png') no-repeat center center fixed;
    background-size: cover;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    font-family: Arial, sans-serif;
}
.container {
    position: relative;
    text-align: center;
    background: #e3d7cb;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    min-width: 300px;
    border: 3px solid #000000;
}
.back-button {
    position: absolute;
    top: 15px;
    left: 15px;
    font-size: 20px;
    font-weight: bold;
    color: #007BFF;
    background: none;
    border: none;
    cursor: pointer;
    display: none;
}
.back-button:hover {
    color: #0056b3;
}
h1 {
    margin-bottom: 20px;
    font-size: 24px;
    color: #333333;
}
.button, .platform-button {
    display: inline-block;
    padding: 15px 30px;
    font-size: 16px;
    color: #fff;
    background: linear-gradient(90deg, #2b5876 0%, #4e4376 100%);
    border: none;
    border-radius: 5px;
    text-decoration: none;
    margin: 10px;
    transition: background 0.2s, color 0.2s;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(46, 49, 146, 0.15);
}
.button:hover, .platform-button:hover {
    background: linear-gradient(90deg, #4e4376 0%, #2b5876 100%);
    color: #ffffff;
}
.platform-buttons {
    display: none;
    margin-top: 20px;
}
.main-vertical {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    margin-top: -160px;
}
.logo-supcity {
    display: block;
    margin: 0 auto 50px auto;
    max-width: 600px;
    height: auto;
}

/* Responsive design */
@media (max-width: 900px) {
    .logo-supcity {
        max-width: 99vw;
    }
    .container {
        min-width: 0;
        max-width: 99vw;
        width: 100%;
        padding: 100px 2vw;
        min-height: 520px;
    }
}
@media (max-width: 600px) {
    body {
        padding: 0;
    }
    .main-vertical {
        margin-top: 0;
    }
    .logo-supcity {
        max-width: 99vw;
        margin-bottom: 56px;
    }
    .container {
        min-width: 0;
        max-width: 99vw;
        width: 100%;
        padding: 80px 2vw;
        box-sizing: border-box;
        min-height: 600px;
    }
    h1 {
        font-size: 40px;
    }
    .button {
        padding: 38px 0;
        font-size: 38px;
        width: 100%;
        margin: 32px 0;
    }
    .platform-buttons {
        display: flex !important;
        flex-direction: column;
        align-items: stretch;
        gap: 36px;
        width: 100%;
        margin-top: 40px;
    }
    .platform-button {
        display: block;
        width: 100%;
        padding: 34px 0;
        font-size: 32px;
        margin: 0;
    }
}