/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', sans-serif;
    background: #f2f5f9;
    color: #222;
    line-height: 1.6;
}

a {
    color: #0077cc;
    text-decoration: none;
}

.container {
    width: 90%;
    max-width: 1000px;
    margin: auto;
}

/* Header */
header {
    background: #ffffff;
    padding: 20px 0;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.logo {
    font-size: 1.8rem;
    color: #0077cc;
    font-weight: bold;
    text-align: center;
}

nav {
    margin-top: 10px;
    text-align: center;
}

.nav-links {
    list-style: none;
    display: inline-flex;
    gap: 30px;
}

.nav-links a {
    font-weight: 600;
    padding-bottom: 5px;
    border-bottom: 2px solid transparent;
    transition: border-color 0.3s ease;
}

.nav-links a:hover {
    border-color: #0077cc;
}

/* Hero */
.hero {
    background: url('https://source.unsplash.com/1600x800/?network,technology') center/cover no-repeat;
    color: white;
    height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
}

.hero .overlay {
    background: rgba(0, 0, 0, 0.6);
    width: 100%;
    padding: 60px 20px;
    text-align: center;
}

.hero h2 {
    font-size: 3rem;
    margin-bottom: 15px;
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 30px;
}

.btn {
    background: #00b4d8;
    color: white;
    padding: 12px 30px;
    font-size: 1rem;
    font-weight: bold;
    border-radius: 30px;
    transition: background 0.3s ease;
}

.btn:hover {
    background: #009db6;
}

/* Sections */
.section {
    padding: 80px 20px;
    background: #fff;
}

.section.alt {
    background: #e9f3f9;
}

.section h2 {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 40px;
    color: #0077cc;
}

/* Cards */
.card-grid {
    display: grid;
    gap: 20px;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.card {
    background: #ffffff;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 3px 12px rgba(0, 0, 0, 0.08);
    transition: transform 0.2s ease;
}

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

.card h3 {
    margin-bottom: 10px;
    color: #0077cc;
}

/* Footer */
footer {
    background: #1a1a1a;
    color: #ccc;
    text-align: center;
    padding: 30px 0;
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 700px) {
    .hero h2 {
        font-size: 2rem;
    }

    .nav-links {
        flex-direction: column;
        gap: 15px;
    }

    .btn {
        font-size: 0.9rem;
    }
}