* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: #0b0f14;
    color: #e6edf3;
    line-height: 1.65;
}

a {
    color: #58a6ff;
}

.nav {
    background: #111827;
    border-bottom: 1px solid #243244;
    padding: 14px 20px;
    text-align: center;
    position: sticky;
    top: 0;
    z-index: 10;
}

.nav a {
    color: #d7efff;
    text-decoration: none;
    margin: 0 12px;
    font-weight: 700;
}

.nav a:hover {
    color: #7dd3fc;
}

.hero {
    background: linear-gradient(135deg, #111827, #0b3b2e);
    padding: 60px 20px;
    text-align: center;
    border-bottom: 1px solid #1f7a5c;
}

.hero h1 {
    margin: 0 0 12px;
    font-size: 42px;
    color: #d1fae5;
}

.hero p {
    max-width: 760px;
    margin: 0 auto;
    color: #b7c9d6;
    font-size: 18px;
}

.container {
    width: 1000px;
    max-width: 94%;
    margin: 34px auto;
}

.grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
}

.card,
.article {
    background: #111827;
    border: 1px solid #243244;
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 12px 30px rgba(0,0,0,0.18);
}

.card h2,
.card h3,
.article h2,
.article h3 {
    color: #d1fae5;
    margin-top: 0;
}

.card p,
.article p,
.article li {
    color: #c9d7e1;
}

.button-link {
    display: inline-block;
    background: #064e3b;
    color: #d1fae5;
    text-decoration: none;
    padding: 10px 14px;
    border-radius: 8px;
    font-weight: 700;
    margin-top: 8px;
}

.button-link:hover {
    background: #047857;
}

pre {
    background: #05080d;
    border: 1px solid #243244;
    color: #d1fae5;
    padding: 14px;
    border-radius: 8px;
    overflow-x: auto;
}

code {
    color: #a7f3d0;
}

.resource-box {
    background: #07131f;
    border-left: 4px solid #10b981;
    padding: 16px;
    border-radius: 8px;
    margin: 22px 0;
}

.footer {
    text-align: center;
    padding: 30px;
    color: #7d8b99;
    border-top: 1px solid #243244;
    margin-top: 45px;
}

@media (max-width: 750px) {
    .grid {
        grid-template-columns: 1fr;
    }

    .hero h1 {
        font-size: 32px;
    }

    .nav a {
        display: inline-block;
        margin: 5px 8px;
    }
}