* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    background-color: #111827;
    color: #f3f4f6;
    line-height: 1.7;
}

/* HERO SECTION */

.hero {
    height: 60vh;
    background: linear-gradient(
        135deg,
        #0f172a,
        #1e293b,
        #111827
    );
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    border-bottom: 4px solid #3b82f6;
}

.overlay h1 {
    font-size: 4rem;
    margin-bottom: 10px;
    color: #ffffff;
}

.overlay p {
    font-size: 1.2rem;
    color: #cbd5e1;
}

/* NAVBAR */

.navbar {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    background-color: #1e293b;
    padding: 15px;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar a {
    color: #e2e8f0;
    text-decoration: none;
    margin: 10px 15px;
    font-weight: bold;
    transition: 0.3s;
}

.navbar a:hover {
    color: #60a5fa;
}

/* MAIN CONTAINER */

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

/* CARDS */

.card {
    background-color: #1e293b;
    margin-bottom: 30px;
    padding: 30px;
    border-radius: 14px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.4);
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
}

.card h2 {
    color: #60a5fa;
    margin-bottom: 15px;
    font-size: 2rem;
}

.card p {
    margin-bottom: 15px;
    color: #d1d5db;
}

.card ul {
    margin-left: 20px;
    margin-bottom: 15px;
}

.card li {
    margin-bottom: 8px;
}

/* CONCLUSION */

.conclusion {
    border-left: 5px solid #3b82f6;
}

/* FOOTER */

footer {
    text-align: center;
    padding: 20px;
    background-color: #0f172a;
    color: #9ca3af;
    margin-top: 40px;
}

/* RESPONSIVE */

@media (max-width: 768px) {

    .overlay h1 {
        font-size: 2.5rem;
    }

    .overlay p {
        font-size: 1rem;
    }

    .card {
        padding: 20px;
    }

    .card h2 {
        font-size: 1.5rem;
    }
}