:root {
    --fondo: #f8f5f2;
    --primario: #2e4a7d;
    --secundario: #f6a560;
    --texto: #2b2b2b;
    --blanco: #ffffff;
    --gris: #d8d3cf;
    --radio: 18px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Roboto', sans-serif;
    background: linear-gradient(180deg, #f8f5f2 0%, #e9e5e1 100%);
    color: var(--texto);
    line-height: 1.6;
}

img {
    max-width: 100%;
    display: block;
}

.main-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    background: rgba(46, 74, 125, 0.95);
    padding: 16px;
}

.main-nav button {
    border: none;
    background: var(--secundario);
    color: var(--blanco);
    padding: 12px 18px;
    border-radius: 999px;
    cursor: pointer;
    font-weight: 600;
}

.main-nav button:hover {
    transform: translateY(-1px);
}

.hero {
    display: grid;
    gap: 24px;
    padding: 40px 20px;
    max-width: 1200px;
    margin: 0 auto;
    align-items: center;
}

.hero h1 {
    font-family: 'Montserrat', sans-serif;
    font-size: clamp(2.4rem, 4vw, 3.8rem);
    color: var(--primario);
    margin-bottom: 16px;
}

.hero p {
    max-width: 680px;
}

.hero-image {
    width: 100%;
    border-radius: var(--radio);
    border: 2px solid rgba(46, 74, 125, 0.15);
}

section {
    padding: 28px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.integrantes ul {
    list-style: none;
    padding: 0;
    display: grid;
    gap: 12px;
}

.integrantes a {
    text-decoration: none;
    color: var(--secundario);
    font-weight: 600;
}

.integrantes a:hover {
    text-decoration: underline;
}

.card,
.bitacora {
    background: var(--blanco);
    margin: 20px auto;
    max-width: 860px;
    border-radius: var(--radio);
    padding: 32px;
    box-shadow: 0 18px 36px rgba(44, 54, 74, 0.08);
}

.card {
    text-align: center;
}

.card .avatar {
    width: 180px;
    height: 180px;
    margin: 0 auto 24px;
    border-radius: 50%;
    border: 4px solid var(--secundario);
    background: var(--gris);
}

.card h1 {
    margin-bottom: 10px;
    font-family: 'Montserrat', sans-serif;
}

.details {
    margin: 20px 0;
    text-align: left;
}

.details h3 {
    margin-bottom: 10px;
    color: var(--primario);
}

.details ul {
    margin: 0;
    padding-left: 20px;
}

button,
.volver {
    border: none;
    background: var(--primario);
    color: var(--blanco);
    padding: 12px 20px;
    border-radius: 999px;
    cursor: pointer;
    margin: 12px 6px 0 0;
    font-weight: 600;
}

button:hover,
.volver:hover {
    opacity: 0.95;
}

.extra-text {
    display: none;
    margin-top: 18px;
    padding: 16px;
    border-radius: 14px;
    background: #eef4ff;
    color: #243b5a;
}

.extra-text.visible {
    display: block;
}

.mensaje {
    margin-top: 18px;
    font-weight: 600;
    color: var(--primario);
}

.site-footer {
    text-align: center;
    padding: 24px 20px 34px;
    color: #5a5a5a;
}

.bitacora section {
    margin-bottom: 24px;
}

.bitacora h2 {
    color: var(--primario);
}

@media (max-width: 400px) {
    .main-nav {
        padding: 12px;
    }

    .main-nav button {
        flex: 1 1 100%;
    }

    .hero,
    .card,
    .bitacora,
    section {
        padding: 18px 14px;
    }
}

@media (min-width: 900px) {
    .hero {
        grid-template-columns: 1.3fr 1fr;
        align-items: center;
    }

    .integrantes ul {
        grid-template-columns: repeat(3, minmax(180px, 1fr));
    }

    .card {
        padding: 40px;
    }
}

@media (min-width: 1200px) {
    body {
        font-size: 1rem;
    }

    .hero {
        gap: 32px;
        padding: 60px 20px;
    }

    .card,
    .bitacora {
        padding: 44px;
    }
}

.theme-alt {
    background: linear-gradient(135deg, #eaf8ff 0%, #f3f0ff 100%);
    border: 1px solid rgba(46, 74, 125, 0.2);
}