body {
    margin: 0;
    padding: 0;
    background: url('fon.png') no-repeat center center fixed;
    background-size: cover;
    font-family: 'Arial', sans-serif;
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    text-align: center;
}

.main-container {
    display: flex;
    width: 80%;
    height: 80vh;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

.sidebar {
    background: linear-gradient(180deg, #007BFF, #00A4FF);
    padding: 20px;
    color: #fff;
    width: 20%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.sidebar .logo {
    max-width: 60px;
    margin-bottom: 20px;
}

.sidebar nav ul {
    list-style: none;
    padding: 0;
}

.sidebar nav ul li {
    margin: 10px 0;
}

.sidebar nav ul li a {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
}

.content {
    padding: 40px;
    width: 80%;
}

header h1 {
    font-size: 4em;
    margin-bottom: 20px;
    letter-spacing: 2px;
    color: #fff;
}

header p {
    font-size: 1.2em;
    margin-bottom: 20px;
}

.referral-link {
    display: inline-block;
    padding: 10px 20px;
    background: #007BFF;
    color: #fff;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
}

.countdown {
    font-size: 3em;
    margin-bottom: 40px;
    font-weight: bold;
    color: #fff;
    animation: fadeIn 2s ease-in-out infinite alternate;
    padding: 10px;
    border-radius: 5px;
}

@keyframes fadeIn {
    from { opacity: 0.8; }
    to { opacity: 1; }
}

footer {
    font-size: 1em;
    margin-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.5);
    padding-top: 10px;
}