* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: #ffffff;
    color: #111827;
}

.container {
    max-width: 1100px;
    margin: auto;
    padding: 40px 20px;
}

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

.logo {
    font-size: 24px;
    font-weight: 700;
}

nav a {
    margin-left: 25px;
    text-decoration: none;
    color: inherit;
}

.hero {
    padding: 90px 0;
}

.hero h1 {
    font-size: 52px;
    max-width: 700px;
}

.hero p {
    font-size: 20px;
    color: #64748b;
    max-width: 600px;
}

.btn {
    display: inline-block;
    margin-top: 25px;
    padding: 14px 28px;
    background: #2563eb;
    color:white;
    border-radius:10px;
    text-decoration:none;
}

.cards {
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:20px;
}

.card {
    padding:25px;
    border:1px solid #e5e7eb;
    border-radius:16px;
}

footer {
    margin-top:80px;
    padding:30px 0;
    color:#64748b;
}


@media (prefers-color-scheme: dark) {

body {
    background:#0b0f14;
    color:#f8fafc;
}

.card {
    border-color:#1e293b;
}

.hero p {
    color:#94a3b8;
}

nav a {
    color:#f8fafc;
}

}