* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
}

body {
    background: #0f172a;
    color: #ffffff;
    line-height: 1.6;
}

.container {
    width: 90%;
    max-width: 1100px;
    margin: auto;
    padding: 40px 0;
}

header {
    background: #111827;
    padding: 20px 0;
}

.logo {
    float: left;
    font-size: 20px;
}

nav ul {
    list-style: none;
    float: right;
}

nav ul li {
    display: inline;
    margin-left: 20px;
}

nav ul li a {
    color: white;
    text-decoration: none;
}

.btn {
    background: #2563eb;
    padding: 8px 15px;
    border-radius: 5px;
}

.hero {
    text-align: center;
    padding: 100px 0;
}

.hero h2 {
    font-size: 36px;
    margin-bottom: 20px;
}

.btn-primary {
    background: #2563eb;
    padding: 12px 25px;
    text-decoration: none;
    color: white;
    border-radius: 5px;
    display: inline-block;
    margin-top: 20px;
}

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

.card {
    background: #1f2937;
    padding: 20px;
    border-radius: 8px;
    flex: 1;
    min-width: 250px;
}

.dark {
    background: #111827;
}

footer {
    text-align: center;
    padding: 20px;
    background: #0b1120;
}