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

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

/* HEADER */
header {
    background: white;
    padding: 15px 8%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

header nav a {
    margin: 0 12px;
    text-decoration: none;
    color: #1f2937;
    font-weight: 500;
}

.whatsapp-btn {
    background: #25D366;
    color: white;
    padding: 10px 18px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: 0.3s;
}

.whatsapp-btn:hover {
    background: #1ebe5d;
}

/* HERO */
.hero {
    background: linear-gradient(135deg, #0b2c4d, #133b67);
    color: white;
    padding: 100px 8%;
    text-align: center;
}

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

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

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

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

/* CARDS */
.cards {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.card {
    background: white;
    padding: 30px;
    width: 300px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.08);
    transition: 0.3s;
}

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

.card h3 {
    margin-bottom: 15px;
    color: #0b2c4d;
}

/* CTA */
.cta {
    background: #0b2c4d;
    color: white;
    padding: 60px 8%;
    text-align: center;
}

.cta h2 {
    margin-bottom: 20px;
}

/* FOOTER */
footer {
    background: #111827;
    color: white;
    text-align: center;
    padding: 30px;
    font-size: 14px;
}

/* FLOATING WHATSAPP */
.whatsapp-float {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: #25D366;
    color: white;
    padding: 16px;
    border-radius: 50%;
    font-size: 20px;
    text-decoration: none;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

/* RESPONSIVE */
@media(max-width: 768px) {
    .hero h1 {
        font-size: 28px;
    }

    .cards {
        flex-direction: column;
        align-items: center;
    }
}