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

body {
    font-family: Arial, sans-serif;
    background: #f5f7fa;
    color: #1f2937;
    line-height: 1.6;
}


/* Navigation */

header {
    background: #111827;
    padding: 18px 8%;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    color: white;
    font-size: 24px;
    font-weight: bold;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 25px;
}

nav ul li a {
    color: white;
    text-decoration: none;
}

nav ul li a:hover {
    text-decoration: underline;
}


/* Hero */

.hero {
    min-height: 550px;
    display: flex;
    align-items: center;
    padding: 60px 8%;
    background: linear-gradient(
        135deg,
        #111827,
        #374151
    );
}

.hero-content {
    max-width: 750px;
    color: white;
}

.tag {
    font-size: 14px;
    letter-spacing: 3px;
    margin-bottom: 15px;
}

.hero h1 {
    font-size: 52px;
    line-height: 1.15;
    margin-bottom: 25px;
}

.hero p {
    font-size: 20px;
    margin-bottom: 30px;
}

.button {
    display: inline-block;
    padding: 14px 25px;
    background: white;
    color: #111827;
    text-decoration: none;
    border-radius: 6px;
    font-weight: bold;
}


/* Sections */

.section,
.page {
    padding: 70px 8%;
}

.section h2,
.page h1 {
    margin-bottom: 25px;
}

.section p {
    max-width: 850px;
}


/* Cards */

.cards,
.service-grid {
    padding: 30px 8% 70px;
    display: grid;
    grid-template-columns: repeat(
        auto-fit,
        minmax(250px, 1fr)
    );
    gap: 25px;
}

.card {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(
        0,
        0,
        0,
        0.08
    );
}

.card h2,
.card h3 {
    margin-bottom: 15px;
}


/* Architecture */

.architecture {
    margin: 40px 0;
    text-align: center;
}

.architecture-box {
    display: inline-block;
    min-width: 250px;
    padding: 20px;
    margin: 5px;
    background: #111827;
    color: white;
    border-radius: 8px;
    font-weight: bold;
}

.arrow {
    font-size: 30px;
}


/* Footer */

footer {
    background: #111827;
    color: white;
    text-align: center;
    padding: 30px;
}


/* Responsive */

@media (max-width: 768px) {

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

    nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero h1 {
        font-size: 38px;
    }

}