/* VARIABLES Y TIPOGRAFÍA */
:root {
    --color-primary-dark: #5e9298; /* Tonalidad más oscura */
    --color-primary-medium: #7cb8c0; /* Color base */
    --color-primary-light: #ffffff; /* Tonalidad más clara */
    --color-text-dark: #3a6d72; /* Variante más oscura para texto */
    --color-text-light: #ffffff; /* Variante más clara para texto */
    --color-background: #ffffff; /* Fondo claro relacionado */
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    margin: 0;
    background-color: var(--color-background);
    color: var(--color-text-dark);
    line-height: 1.6;
}

/* ENCABEZADO */
header {
    background-color: var(--color-primary-dark);
    color: var(--color-text-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

header img {
    height: 80px;
}

nav a {
    font-size: 1.4em;
    color: var(--color-text-light);
    text-decoration: none;
    margin: 0 20px;
    font-weight: bold;
}

nav a:hover {
    color: var(--color-primary-light);
    transition: color 0.3s ease;
}

/* ESTRUCTURA PRINCIPAL */
main {
    padding: 40px 20px;
    max-width: 1200px;
    margin: auto;
}

section {
    margin-bottom: 40px;
}

/* TITULOS Y TEXTO */
h1 {
    font-size: 3em;
    margin-bottom: 10px;
    color: var(--color-primary-dark);
    font-weight: bold;
}

h2 {
    font-size: 2em;
    margin-bottom: 10px;
    color: var(--color-primary-dark);
    border-bottom: 2px solid var(--color-primary-medium);
    padding-bottom: 10px;
}

h3 {
    font-size: 1.7em;
    margin-bottom: 10px;
    color: var(--color-primary-medium);
}

p {
    margin-bottom: 20px;
    font-size: 1.1em;
}

#inicio p {
    font-size: 1.5em;
}

strong {
    font-size: 25px;
}

/* LISTAS */
ul {
    display: flex;
    justify-content: space-around;
    list-style: none;
    padding: 0;
    margin: 20px 0;
}

li {
    text-align: center;
    max-width: 300px;
}

li img {
    margin-bottom: 10px;
}

li p {
    font-weight: bold;
    font-size: 1.3em;
}

/* IMÁGENES */
#inicio img {
    height: 90px;
    margin-top: 40px;
}

/* ENLACES */
#inicio a {
    font-weight: bold;
    color: var(--color-text-dark);
}

/* FORMULARIOS */
form {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
}

fieldset {
    border: none;
    padding: 0;
    max-width: 600px;
    width: 100%;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

input,
textarea {
    margin-bottom: 15px;
    width: 100%;
    padding: 10px;
    border: 1px solid var(--color-primary-medium);
    border-radius: 5px;
    background-color: var(--color-primary-light);
    color: var(--color-text-dark);
    font-size: 1em;
}

input::placeholder,
textarea::placeholder {
    color: #5D4F41;
    opacity: 1;
}

button {
    background-color: var(--color-primary-dark);
    border: none;
    color: var(--color-text-light);
    cursor: pointer;
    padding: 12px 20px;
    font-size: 1.1em;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.15);
}

button:hover {
    background-color: var(--color-primary-medium);
    color: var(--color-text-light);
    transition: background-color 0.3s ease;
}

button:active {
    transform: scale(0.98);
}

/* FOOTER */
footer {
    background-color: var(--color-primary-dark);
    color: var(--color-text-light);
    padding: 20px;
    text-align: center;
    margin-top: 40px;
}

footer a {
    color: var(--color-text-light);
    text-decoration: underline;
}

/* MEDIA QUERIES */
@media (max-width: 600px) {
    ul {
        flex-direction: column;
        align-items: center;
    }

    li {
        margin-bottom: 20px;
    }

    form {
        flex-direction: column;
        gap: 10px;
    }

    input,
    textarea {
        width: 100%;
    }
}

section {
    padding-top: 100px;
    margin-top: -100px;
    position: relative;
}