body {
    font-family: Arial, sans-serif;
    margin: 0;
    background: #f4f6f9;
}

.container {
    width: 90%;
    max-width: 1100px;
    margin: auto;
}

header {
    background: #0f172a;
    color: white;
    padding: 15px 0;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav a {
    color: white;
    margin-left: 15px;
    text-decoration: none;
}

.btn-primary {
    background: #2563eb;
    color: white;
    padding: 10px 20px;
    border-radius: 5px;
    text-decoration: none;
    border: none;
    cursor: pointer;
}

.hero {
    text-align: center;
    padding: 80px 0;
    background: linear-gradient(to right, #1e3a8a, #2563eb);
    color: white;
}

.section {
    padding: 60px 0;
}

.section.dark {
    background: #0f172a;
    color: white;
}

.grid {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    flex: 1;
}

.card.premium {
    border: 2px solid #2563eb;
}

textarea {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
}
footer {
    text-align: center;
    padding: 20px;
    background: #111;
    color: white;
}