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

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

.hero {
    min-height: 100vh;
    background: linear-gradient(120deg, #0f2027, #203a43, #2c5364);
    color: #fff;
    display: flex;
    flex-direction: column;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 60px;
}

.brand {
    font-size: 22px;
    font-weight: bold;
}

.brand span {
    color: #4da3ff;
}

.nav ul {
    display: flex;
    list-style: none;
    gap: 20px;
}

.nav a {
    color: #fff;
    text-decoration: none;
    font-size: 14px;
}

.hero-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 60px;
    max-width: 700px;
}

.hero-content h1 {
    font-size: 42px;
    margin-bottom: 20px;
}

.hero-content p {
    font-size: 18px;
    margin-bottom: 30px;
}

.btn {
    display: inline-block;
    padding: 12px 28px;
    background: #4da3ff;
    color: #fff;
    text-decoration: none;
    border-radius: 4px;
    width: fit-content;
}

.section {
    padding: 80px 60px;
    text-align: center;
}

.section h2 {
    font-size: 32px;
    margin-bottom: 40px;
}

.section.alt {
    background: #f5f7fa;
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 30px;
}

.card {
    padding: 30px;
    border-radius: 6px;
    background: #fff;
    box-shadow: 0 10px 25px rgba(0,0,0,.08);
}

.link-demo {
    display: inline-block;
    margin-top: 30px;
    color: #2c7be5;
    font-weight: bold;
    text-decoration: none;
}

.contact {
    font-size: 18px;
    margin-top: 20px;
}

.footer {
    background: #111;
    color: #aaa;
    padding: 20px;
    text-align: center;
    font-size: 13px;
}

/* Responsive */
@media (max-width: 768px) {
    .nav {
        flex-direction: column;
        gap: 10px;
    }

    .hero-content {
        padding: 40px;
    }

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