/* ======== ESTILO GENERAL ======== */
body {
    margin: 0;
    font-family: "Segoe UI", Arial, sans-serif;
    background: #f4f7f4;
    color: #333;
}

/* ======== HEADER ======== */
header {
    background: #4CAF50;
    color: white;
    padding: 20px;
    text-align: center;
    font-size: 28px;
    font-weight: bold;
}

/* ======== MENÚ ======== */
nav {
    background: #388E3C;
    padding: 10px;
    text-align: center;
}

nav a {
    color: white;
    text-decoration: none;
    margin: 0 15px;
    font-size: 18px;
    font-weight: bold;
}

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

/* ======== SECCIONES ======== */
section {
    max-width: 900px;
    margin: 30px auto;
    background: white;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

/* ======== BOTONES REDONDEADOS ======== */
.round-btn {
    display: inline-block;
    padding: 12px 20px;
    margin: 8px;
    background: #4CAF50;
    color: white;
    border-radius: 30px;
    cursor: pointer;
    font-weight: bold;
    transition: 0.3s;
}

.round-btn:hover {
    background: #45a049;
}

/* ======== CONTENIDO INTERNO ======== */
.unit-content {
    display: none;
    margin-top: 20px;
}

.unit-content.active {
    display: block;
}

/* ======== PESTAÑAS DE UNIDADES ======== */
.tabs {
    display: flex;
    overflow-x: auto;
    background: #e8f5e9;
    padding: 10px;
    border-radius: 10px;
}

.tab {
    padding: 4px 8px;
    margin-right: 10px;
    background: #4CAF50;
    color: white;
    border-radius: 12px;
    cursor: pointer;
    font-weight: bold;
    font-size: 11px;
    white-space: nowrap;
}

.tab.active {
    background: #2e7d32;
}

/* ======== FOOTER ======== */
footer {
    text-align: center;
    padding: 20px;
    margin-top: 40px;
    background: #4CAF50;
    color: white;
    font-weight: bold;
}