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

/* BODY */
body {
    background: #f5f7fa;
    color: #333;
    line-height: 1.7;
}

/* NAV */
.nav {
    background: #111827;
    padding: 5px 20px;
    text-align: center;
}

.nav a {
    color: #ffffff;
    margin: 0 12px;
    text-decoration: none;
    font-weight: 600;
}

.nav a:hover {
    color: #facc15;
}

/* HEADER */
header {
    text-align: center;
    padding: 30px 15px;
}

header img {
    max-width: 160px;
}

header h1 {
    margin-top: 15px;
    font-size: 26px;
    color: #111827;
}

/* MAIN */
main {
    max-width: 900px;
    margin: auto;
    padding: 20px;
}

/* BUTTON */
.btn {
    margin: 12px 0;
    text-align: center;
}

.btn button {
    width: 100%;
    padding: 14px;
    font-size: 16px;
    font-weight: bold;
    background: linear-gradient(135deg, #2563eb, #1e40af);
    color: #ffffff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

.btn button:hover {
    background: linear-gradient(135deg, #1e40af, #2563eb);
}

/* SECTION ARTIKEL SEO */
section {
    margin-top: 40px;
}

article {
    background: #ffffff;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.05);
}

/* JUDUL */
article h2 {
    font-size: 22px;
    margin-bottom: 15px;
    color: #1e40af;
}

article h3 {
    font-size: 18px;
    margin-top: 25px;
    margin-bottom: 10px;
    color: #111827;
}

/* PARAGRAF */
article p {
    margin-bottom: 15px;
    font-size: 15px;
    text-align: justify;
}

/* RESPONSIVE */
@media (max-width: 600px) {
    header h1 {
        font-size: 22px;
    }

    article h2 {
        font-size: 20px;
    }

    .btn button {
        font-size: 15px;
    }
}