:root {
    --black: #0e0e0e;
    --white: #ffffff;
    --military-green: #3a5f4b;
    --gray: #cfcfcf;
    --light-gray: #f5f5f5;
}

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

/* BASE */
body {
    font-family: 'Inter', system-ui, sans-serif;
    background-color: var(--white);
    color: var(--black);
    line-height: 1.6;
}

img {
    max-width: 100%;
    display: block;
    border-radius: 6px;
}

a {
    text-decoration: none;
    color: inherit;
}

/* HEADER */
.header {
    background-color: var(--black);
    color: var(--white);
    text-align: center;
    padding: 3rem 1.5rem;
}

.header h1 {
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 700;
    letter-spacing: 2px;
}

.header p {
    margin-top: 0.8rem;
    font-size: 1.1rem;
    opacity: 0.85;
}

/* NAV */
.nav {
    background-color: var(--black);
    display: flex;
    justify-content: center;
    gap: 2rem;
    padding: 1rem;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.nav a {
    color: var(--white);
    font-weight: 500;
}

.nav a:hover {
    color: var(--military-green);
}

/* MAIN CONTAINER (WEB) */
.contenedor {
    width: 90%;
    max-width: 1200px;
    margin: auto;
    padding: 4rem 3rem;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

/* CARD */
.card {
    background-color: var(--white);
    border: 1px solid var(--gray);
    padding: 1.8rem;
    transition: border-color 0.3s ease;
}

.card h2 {
    font-size: 1.4rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.card p {
    font-size: 0.95rem;
    margin-bottom: 1rem;
    opacity: 0.9;
}

/* LISTS */
.card ul {
    margin-left: 1.2rem;
    margin-bottom: 1rem;
}

.card li {
    margin-bottom: 0.4rem;
}

/* TABLE */
.card table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
    font-size: 0.9rem;
}

.card th,
.card td {
    border: 1px solid var(--gray);
    padding: 0.6rem;
    text-align: center;
}

.card th {
    background-color: var(--light-gray);
}

/* BUTTON */
.boton {
    display: inline-block;
    margin-top: 1rem;
    background-color: var(--military-green);
    color: var(--white);
    padding: 0.7rem 1.6rem;
    font-size: 0.95rem;
}

.boton:hover {
    opacity: 0.85;
}

/* LINK */
.link {
    display: inline-block;
    margin-top: 0.8rem;
    font-weight: 600;
    color: var(--military-green);
}

.link:hover {
    text-decoration: underline;
}

/* FOOTER */
.footer {
    background-color: var(--black);
    color: var(--gray);
    text-align: center;
    padding: 2rem 1rem;
    font-size: 0.85rem;
}

/* =========================
   E - MOBILE
   Cards una debajo de otra
========================= */
@media screen and (max-width: 480px) {

    .header {
        padding: 2rem 1rem;
    }

    .header h1 {
        font-size: 1.7rem;
    }

    .header p {
        font-size: 0.95rem;
    }

    .nav {
        gap: 1.2rem;
        padding: 0.8rem;
        flex-wrap: wrap;
    }

    .nav a {
        font-size: 0.9rem;
    }

    .contenedor {
        width: 100%;
        padding: 1.5rem 1rem;
        display: flex;
        flex-direction: column;
        gap: 1.5rem;
    }

    .card {
        width: 100%;
        padding: 1.4rem;
    }

    .card h2 {
        font-size: 1.2rem;
    }

    .card p,
    .card li,
    .card table {
        font-size: 0.85rem;
    }

    .boton {
        width: 100%;
        text-align: center;
        padding: 0.9rem;
    }

    .footer {
        font-size: 0.75rem;
        padding: 1.5rem 1rem;
    }
}