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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: #f5f5f5;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    color: #333;
}

.activation-container {
    background: white;
    border-radius: 8px;
    border: 1px solid #e0e0e0;
    padding: 50px 40px;
    max-width: 480px;
    width: 100%;
    text-align: center;
}

.icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 25px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 32px;
    font-weight: 300;
}

.icon.success {
    background: #f8f8f8;
    color: #2d2d2d;
    border: 2px solid #2d2d2d;
}

.icon.error {
    background: #f8f8f8;
    color: #666;
    border: 2px solid #999;
}

h1 {
    color: #2d2d2d;
    font-size: 24px;
    margin-bottom: 12px;
    font-weight: 500;
}

.message {
    color: #666;
    font-size: 15px;
    line-height: 1.6;
    margin-bottom: 30px;
}

.success-message {
    color: #2d2d2d;
}

.error-message {
    color: #666;
}

.btn {
    display: inline-block;
    padding: 12px 32px;
    background: #2d2d2d;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    font-weight: 400;
    font-size: 15px;
    transition: background 0.2s ease;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background: #1a1a1a;
}

.btn:active {
    background: #000;
}

@media (max-width: 600px) {
    .activation-container {
        padding: 40px 25px;
    }
    
    h1 {
        font-size: 22px;
    }
    
    .message {
        font-size: 14px;
    }
    
    .icon {
        width: 50px;
        height: 50px;
        font-size: 26px;
    }
}