* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    color: #1f2937;
    background: #f8fafc;
}

.navbar {
    height: 72px;
    padding: 0 8%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #0f172a;
    color: white;
}

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

.navbar a {
    color: white;
    text-decoration: none;
    margin-left: 24px;
    font-size: 15px;
}

.hero {
    min-height: 520px;
    padding: 90px 8%;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #0f172a, #1e3a8a);
    color: white;
}

.hero-content {
    max-width: 760px;
}

.tagline {
    color: #93c5fd;
    font-weight: bold;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.hero h1 {
    font-size: 56px;
    line-height: 1.08;
    margin: 18px 0;
}

.hero-text {
    font-size: 19px;
    line-height: 1.7;
    color: #dbeafe;
}

.hero-buttons {
    margin-top: 32px;
}

.btn {
    display: inline-block;
    padding: 14px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: bold;
    margin-right: 12px;
}

.primary {
    background: #38bdf8;
    color: #0f172a;
}

.secondary {
    border: 1px solid #93c5fd;
    color: white;
}

.section {
    padding: 80px 8%;
    text-align: center;
}

.section h2 {
    font-size: 38px;
    margin-bottom: 12px;
}

.section-subtitle {
    color: #64748b;
    margin-bottom: 42px;
}

.cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 22px;
    text-align: left;
}

.card {
    background: white;
    padding: 28px;
    border-radius: 14px;
    box-shadow: 0 10px 25px rgba(15, 23, 42, 0.08);
}

.card h3 {
    margin-top: 0;
    color: #0f172a;
}

.card p {
    line-height: 1.6;
    color: #475569;
}

.dark {
    background: #0f172a;
    color: white;
}

.dark p {
    max-width: 820px;
    margin: 0 auto;
    line-height: 1.8;
    color: #cbd5e1;
}

.contact {
    background: white;
}

.note {
    color: #64748b;
    font-size: 14px;
}

footer {
    padding: 28px;
    text-align: center;
    background: #020617;
    color: #94a3b8;
}

@media (max-width: 900px) {
    .cards {
        grid-template-columns: 1fr 1fr;
    }

    .hero h1 {
        font-size: 42px;
    }
}

@media (max-width: 600px) {
    .navbar {
        flex-direction: column;
        height: auto;
        padding: 18px;
    }

    .navbar nav {
        margin-top: 12px;
    }

    .navbar a {
        margin: 0 8px;
    }

    .cards {
        grid-template-columns: 1fr;
    }

    .hero h1 {
        font-size: 34px;
    }
}