/* Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Segoe UI", Arial, sans-serif;
}

body {
    background: #f5f7fa;
    color: #333;
    line-height: 1.6;
}

/* Header */
header {
    background: linear-gradient(135deg, #009688, #004d40);
    color: #fff;
    padding: 20px;
    text-align: center;
}

header h1 {
    margin-bottom: 10px;
    font-size: 28px;
    font-weight: bold;
}

header p {
    font-size: 16px;
}

/* Navbar */
nav {
    background: #00796b;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

nav ul li {
    margin: 0;
}

nav ul li a {
    display: block;
    padding: 14px 20px;
    color: #fff;
    text-decoration: none;
    transition: background 0.3s;
}

nav ul li a:hover {
    background: #004d40;
}

/* Container principal */
.container {
    max-width: 1100px;
    margin: 20px auto;
    padding: 20px;
}

/* Secciones con “cards” */
.section {
    background: #fff;
    margin-bottom: 20px;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

.section h2 {
    margin-bottom: 15px;
    color: #00796b;
    font-size: 22px;
}

/* Cards individuales */
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 15px;
}

.card {
    background: #ffffff;
    border-radius: 10px;
    padding: 15px;
    text-align: center;
    border: 1px solid #ddd;
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.card h3 {
    margin-bottom: 10px;
    color: #16213e;
}

.card p {
    font-size: 14px;
    margin-bottom: 10px;
}

/* Botones */
.btn {
    display: inline-block;
    background: #009688;
    color: white;
    padding: 10px 18px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: bold;
    transition: background 0.3s;
}

.btn:hover {
    background: #004d40;
}

/* Footer */
footer {
    background: #16213e;
    color: #fff;
    text-align: center;
    padding: 15px;
    margin-top: 20px;
    font-size: 14px;
}

/* Responsive */
@media (max-width: 768px) {
    header h1 {
        font-size: 22px;
    }

    nav ul {
        flex-direction: column;
        align-items: center;
    }

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