:root {
    --primary-dark: #0A2540;
    --card-dark: #103154;
    --section-alt: #081e36;
    --accent-blue: #0070F3;
    --accent-hover: #0051B3;
    --muted-text: #9AACC0;
    --dark-text: #162B45;
    --light-bg: #F8F9FA;
    --telegram: #229ED9;
}

/* ===== BASE ===== */
body { font-family: 'Poppins', sans-serif; background-color: var(--primary-dark); color: #fff; overflow-x: hidden; }
.text-accent { color: var(--accent-blue) !important; }
.text-muted-custom { color: var(--muted-text) !important; }
.bg-card-dark { background-color: var(--card-dark) !important; }
.border-secondary-custom { border-color: rgba(255,255,255,0.08) !important; }
.bg-section-alt { background-color: var(--section-alt); }
.max-w-600 { max-width: 600px; }
.img-rounded { border-radius: 14px; object-fit: cover; height: 360px; }

/* ===== NAVBAR ===== */
.navbar { background-color: rgba(10,37,64,0.97); backdrop-filter: blur(12px); border-bottom: 1px solid rgba(255,255,255,0.07); padding: 12px 0; }
.navbar-brand { font-weight: 700; color: white !important; font-size: 1.4rem; letter-spacing: 0.5px; text-decoration: none; }
.nav-link { color: var(--muted-text) !important; font-weight: 500; margin: 0 6px; transition: color 0.3s; font-size: 0.88rem; }
.nav-link:hover, .nav-link.active { color: #fff !important; }

/* ===== BOTONES ===== */
.btn-accent-solid { background-color: var(--accent-blue); color: white !important; border: none; font-weight: 500; border-radius: 8px; padding: 10px 22px; text-decoration: none; transition: all 0.3s ease; display: inline-block; cursor: pointer; }
.btn-accent-solid:hover { background-color: var(--accent-hover); transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,112,243,0.35); }
.btn-outline-custom { border: 1.5px solid rgba(255,255,255,0.25); color: white !important; border-radius: 8px; padding: 10px 22px; text-decoration: none; transition: all 0.3s ease; display: inline-block; background: transparent; cursor: pointer; }
.btn-outline-custom:hover { background-color: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.5); }
.btn-telegram { background-color: var(--telegram); color: white !important; border: none; font-weight: 500; border-radius: 8px; padding: 10px 22px; text-decoration: none; transition: all 0.3s ease; display: inline-block; }
.btn-telegram:hover { background-color: #1a86b8; transform: translateY(-2px); }

/* ===== BADGE / LABEL ===== */
.badge-custom { display: inline-block; background: rgba(0,112,243,0.15); color: var(--accent-blue); border: 1px solid rgba(0,112,243,0.3); padding: 5px 14px; border-radius: 30px; font-size: 0.78rem; font-weight: 600; letter-spacing: 1px; text-transform: uppercase; }
.label-tag { display: inline-block; color: var(--accent-blue); font-weight: 600; font-size: 0.78rem; letter-spacing: 1.5px; text-transform: uppercase; }

/* ===== SECTION HEADING ===== */
.section-heading { font-weight: 700; font-size: 2rem; color: #fff; position: relative; padding-bottom: 16px; display: inline-block; }
.section-heading::after { content: ''; position: absolute; width: 50px; height: 3px; background: var(--accent-blue); bottom: 0; left: 50%; transform: translateX(-50%); border-radius: 2px; }

/* ===== HERO ===== */
.hero { padding: 90px 0 70px; background: linear-gradient(135deg, #0A2540 0%, #051424 100%); border-bottom: 1px solid rgba(255,255,255,0.05); }
.hero-title { font-size: 2.8rem; font-weight: 800; line-height: 1.2; color: #fff; }

/* ===== BENEFIT PILLS ===== */
.benefit-pill { background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08); border-radius: 8px; padding: 10px 12px; font-size: 0.78rem; font-weight: 500; color: #fff; height: 100%; }

/* ===== STATS PANEL ===== */
.stats-panel { background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08); border-radius: 16px; padding: 24px 20px; }
.stats-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0; }
.stat-item { text-align: center; padding: 16px 12px; border-bottom: 1px solid rgba(255,255,255,0.07); border-right: 1px solid rgba(255,255,255,0.07); }
.stats-grid .stat-item:nth-child(2n) { border-right: none; }
.stats-grid .stat-item:nth-last-child(-n+2) { border-bottom: none; }
.stat-num { display: block; font-size: 1.7rem; font-weight: 700; line-height: 1; }
.stat-label { display: block; font-size: 0.76rem; color: var(--muted-text); margin-top: 5px; }
.stat-divider { height: 1px; background: rgba(255,255,255,0.07); margin: 2px 0; }
@media (min-width: 992px) {
    .stats-grid { grid-template-columns: 1fr; }
    .stat-item { border-right: none !important; border-bottom: 1px solid rgba(255,255,255,0.07) !important; padding: 18px 0; }
    .stats-grid .stat-item:last-child { border-bottom: none !important; }
    .stat-num { font-size: 2rem; }
}

/* ===== CARD STEP ===== */
.card-step { background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.07); padding: 28px 24px; border-radius: 14px; height: 100%; transition: border-color 0.3s, transform 0.3s; }
.card-step:hover { border-color: rgba(0,112,243,0.4); transform: translateY(-4px); }
.step-num { font-size: 2.4rem; font-weight: 700; color: var(--accent-blue); margin-bottom: 12px; line-height: 1; }
.card-step h5 { font-weight: 600; color: #fff; margin-bottom: 8px; font-size: 1rem; }
.card-step p { color: var(--muted-text); font-size: 0.85rem; margin-bottom: 0; }

/* ===== CARD FEATURE ===== */
.card-feature { background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.07); padding: 28px 22px; border-radius: 14px; height: 100%; transition: border-color 0.3s, transform 0.3s; }
.card-feature:hover { border-color: rgba(0,112,243,0.35); transform: translateY(-4px); }
.card-feature h6 { color: #fff; font-size: 0.95rem; }
.card-feature p { font-size: 0.83rem; }

/* ===== META BANNER ===== */
.meta-banner { background: linear-gradient(135deg, #0A2540 0%, #051424 100%); border-top: 1px solid rgba(255,255,255,0.06); border-bottom: 1px solid rgba(255,255,255,0.06); }

/* ===== SERVICE CARD (servicios) ===== */
.service-card { background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.07); border-radius: 14px; overflow: hidden; height: 100%; display: flex; flex-direction: column; transition: border-color 0.3s, transform 0.3s; }
.service-card:hover { border-color: rgba(0,112,243,0.4); transform: translateY(-4px); }
.service-img { height: 180px; background-size: cover; background-position: center; }
.service-info { padding: 20px; flex: 1; }
.service-info h5 { color: #fff; font-weight: 600; font-size: 1rem; margin-bottom: 12px; }
.service-info ul { padding-left: 18px; margin-bottom: 0; }
.service-info li { color: var(--muted-text); font-size: 0.84rem; margin-bottom: 5px; }

/* ===== OTHER CAREERS ===== */
.other-careers-card { background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.07); border-radius: 14px; padding: 24px; height: 100%; }
.career-tag { display: block; background: rgba(0,112,243,0.1); border: 1px solid rgba(0,112,243,0.2); border-radius: 6px; padding: 6px 12px; font-size: 0.82rem; color: #fff; font-weight: 500; text-align: center; transition: all 0.2s; }
.career-tag:hover { background: rgba(0,112,243,0.25); border-color: rgba(0,112,243,0.5); }

/* ===== CUSTOM TABS ===== */
.custom-tabs { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; padding: 6px; background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.07); border-radius: 12px; }
.tab-btn { background: transparent; border: none; color: var(--muted-text); font-family: 'Poppins', sans-serif; font-size: 0.88rem; font-weight: 500; padding: 8px 20px; border-radius: 8px; cursor: pointer; transition: all 0.25s; }
.tab-btn:hover { color: #fff; background: rgba(255,255,255,0.05); }
.tab-btn.active { background: var(--accent-blue); color: #fff !important; }
.tab-content-panel { animation: fadeIn 0.3s ease; }

/* ===== TECH CARDS ===== */
.tech-card { background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.07); border-radius: 10px; padding: 16px 12px; text-align: center; color: #fff; transition: border-color 0.3s; }
.tech-card:hover { border-color: rgba(0,112,243,0.4); }

/* ===== SERVICE LIST ===== */
.service-list { padding-left: 0; list-style: none; margin-bottom: 0; }
.service-list li { color: var(--muted-text); font-size: 0.88rem; padding: 6px 0; padding-left: 22px; position: relative; border-bottom: 1px solid rgba(255,255,255,0.04); }
.service-list li::before { content: '→'; color: var(--accent-blue); position: absolute; left: 0; font-weight: 700; }
.service-list li:last-child { border-bottom: none; }

/* ===== PMBOK FLOW ===== */
.pmbok-flow { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.pmbok-step { display: flex; flex-direction: column; align-items: center; gap: 5px; background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08); border-radius: 10px; padding: 10px 12px; font-size: 0.75rem; color: #fff; text-align: center; min-width: 70px; font-weight: 500; }
.pmbok-arrow { color: var(--muted-text); font-size: 0.75rem; }

/* ===== SOFTWARE PILLS ===== */
.software-pill { background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08); border-radius: 30px; padding: 10px 16px; font-size: 0.85rem; color: var(--accent-blue); font-weight: 600; transition: all 0.3s; }
.software-pill:hover { background: rgba(0,112,243,0.15); border-color: rgba(0,112,243,0.3); }

/* ===== PORTFOLIO ===== */
.btn-filter { background: rgba(255,255,255,0.04); color: var(--muted-text); border: 1px solid rgba(255,255,255,0.1); padding: 7px 20px; font-size: 0.85rem; border-radius: 30px; cursor: pointer; transition: all 0.3s; font-family: 'Poppins', sans-serif; font-weight: 500; }
.btn-filter:hover, .btn-filter.active { background: var(--accent-blue); color: #fff; border-color: var(--accent-blue); }
.card-portfolio { background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.07); border-radius: 14px; overflow: hidden; height: 100%; transition: transform 0.3s, border-color 0.3s; }
.card-portfolio:hover { transform: translateY(-6px); border-color: rgba(0,112,243,0.35); }
.portfolio-img { height: 190px; background-size: cover; background-position: center; }
.portfolio-body { padding: 18px; }
.portfolio-body h5 { font-weight: 600; color: #fff; margin-bottom: 7px; font-size: 0.97rem; }
.portfolio-body p { font-size: 0.82rem; color: var(--muted-text); margin-bottom: 0; }
.portfolio-tag { display: inline-block; font-size: 0.72rem; font-weight: 600; padding: 2px 10px; border-radius: 20px; margin-bottom: 9px; text-transform: uppercase; letter-spacing: 0.5px; }
.ingenieria-tag { color: #f59e0b; background: rgba(245,158,11,0.12); border: 1px solid rgba(245,158,11,0.25); }
.telecom-tag { color: #22d3ee; background: rgba(34,211,238,0.12); border: 1px solid rgba(34,211,238,0.25); }
.admin-tag { color: #a78bfa; background: rgba(167,139,250,0.12); border: 1px solid rgba(167,139,250,0.25); }
.sistemas-tag { color: #34d399; background: rgba(52,211,153,0.12); border: 1px solid rgba(52,211,153,0.25); }

/* ===== MISIÓN ===== */
.mision-card { background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.07); border-radius: 14px; padding: 28px 24px; height: 100%; text-align: center; transition: border-color 0.3s, transform 0.3s; }
.mision-card:hover { border-color: rgba(0,112,243,0.35); transform: translateY(-4px); }
.mision-icon { display: inline-block; }

/* ===== CONTACTO ===== */
.contact-info-card { display: flex; align-items: flex-start; gap: 14px; background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.07); border-radius: 12px; padding: 16px 18px; }
.contact-info-icon { color: var(--accent-blue); font-size: 1.2rem; min-width: 22px; margin-top: 2px; }
.footer-link { text-decoration: none; transition: color 0.3s; }
.footer-link:hover { color: var(--accent-blue) !important; }

/* ===== FORMULARIO ===== */
.form-control, .form-select { background-color: rgba(10,37,64,0.6) !important; border: 1px solid rgba(255,255,255,0.1) !important; color: white !important; padding: 12px; border-radius: 8px; font-family: 'Poppins', sans-serif; font-size: 0.88rem; }
.form-control:focus, .form-select:focus { background-color: rgba(10,37,64,0.9) !important; border-color: var(--accent-blue) !important; box-shadow: 0 0 0 3px rgba(0,112,243,0.15) !important; color: white !important; }
.form-control::placeholder { color: var(--muted-text) !important; }
.form-select { background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%238898AA' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M2 5l6 6 6-6'/%3e%3c/svg%3e") !important; background-repeat: no-repeat !important; background-position: right 12px center !important; background-size: 16px !important; }
.form-select option { background-color: #0A2540; color: white; }

/* ===== FOOTER ===== */
footer { background-color: #051424; }

/* ===== ANIMACIÓN ===== */
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

/* ===== RESPONSIVE ===== */
@media (max-width: 992px) {
    .hero-title { font-size: 2.1rem; }
    .pmbok-flow { justify-content: center; }
}
@media (max-width: 768px) {
    .hero { padding: 60px 0 50px; }
    .hero-title { font-size: 1.8rem; }
    .section-heading { font-size: 1.6rem; }
    .img-rounded { height: 240px; }
    .custom-tabs { gap: 4px; }
    .tab-btn { padding: 7px 14px; font-size: 0.82rem; }
    /* Botones más grandes para touch */
    .btn-accent-solid, .btn-outline-custom, .btn-telegram { padding: 12px 22px; min-height: 44px; }
    /* Cards sin hover en táctil — activar al tocar */
    .card-step, .card-feature, .service-card, .card-portfolio, .mision-card { transition: none; }
    /* Formulario: campos más altos para dedos */
    .form-control, .form-select { padding: 13px; font-size: 16px; /* evita zoom en iOS */ }
    /* Nav link más grande en móvil */
    .nav-link { padding: 10px 6px !important; font-size: 0.95rem; }
    /* Contact info cards más compactas */
    .contact-info-card { padding: 13px 14px; }
    /* Portfolio filtros: scroll horizontal si son muchos */
    #portfolio-filters { flex-wrap: wrap; justify-content: center; gap: 6px; }
    .btn-filter { font-size: 0.8rem; padding: 6px 14px; }
    /* Stats panel en mobile ya es grid 2x2 */
    .stats-panel { padding: 16px; }
}

/* ===== HERO ACADÉMICO — imagen de fondo ===== */
.hero-academic {
    position: relative;
    background:
        linear-gradient(135deg, rgba(10,37,64,0.93) 0%, rgba(5,20,36,0.92) 100%),
        url('https://images.unsplash.com/photo-1523050854058-8df90110c9f1?q=80&w=1400&auto=format&fit=crop') center/cover no-repeat;
}

/* ===== NOSOTROS — imagen de fondo ===== */
.nosotros-bg {
    position: relative;
    background:
        linear-gradient(135deg, rgba(10,37,64,0.95) 0%, rgba(5,20,36,0.94) 100%),
        url('https://images.unsplash.com/photo-1627556704302-624286467c65?q=80&w=1400&auto=format&fit=crop') center/cover no-repeat fixed;
}

/* Birrete flotante decorativo en hero */
.hero-academic::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background:
        url('https://images.unsplash.com/photo-1496307653780-42ee777d4833?q=80&w=1400&auto=format&fit=crop') right center/40% no-repeat;
    opacity: 0.06;
    pointer-events: none;
}

/* ===== CAREER TAG EXTRA ===== */
.career-tag-other {
    background: rgba(255,255,255,0.06) !important;
    border-color: rgba(255,255,255,0.15) !important;
    color: var(--muted-text) !important;
    font-style: italic;
    width: 100%;
    display: block;
    text-align: center;
}

/* ===== ÍCONOS ACADÉMICOS FLOTANTES ===== */
.academic-icons {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    overflow: hidden;
    pointer-events: none;
    z-index: 0;
}
.hero-academic .container { position: relative; z-index: 1; }

.acad-icon {
    position: absolute;
    color: var(--accent-blue);
    opacity: 0.07;
    animation: floatIcon 8s ease-in-out infinite;
}
.acad-icon i { font-size: 5rem; }

.acad-icon-1 { top: 8%;  left: 5%;  animation-delay: 0s;   font-size: 6rem; opacity: 0.09; }
.acad-icon-2 { top: 15%; right: 8%; animation-delay: 1.5s; font-size: 5rem; }
.acad-icon-3 { bottom: 20%; left: 12%; animation-delay: 3s; }
.acad-icon-4 { bottom: 12%; right: 5%; animation-delay: 2s; font-size: 4.5rem; }
.acad-icon-5 { top: 45%;  left: 2%;  animation-delay: 4s;  font-size: 4rem; }
.acad-icon-6 { top: 40%;  right: 3%; animation-delay: 0.8s; font-size: 4rem; }

@keyframes floatIcon {
    0%   { transform: translateY(0px) rotate(0deg); }
    50%  { transform: translateY(-18px) rotate(5deg); }
    100% { transform: translateY(0px) rotate(0deg); }
}

@media (max-width: 768px) {
    .acad-icon i { font-size: 3rem; }
    .acad-icon-2, .acad-icon-5, .acad-icon-6 { display: none; }
}

/* ===== FRANJA DE UNIVERSIDADES — carrusel infinito ===== */
.uni-band { background: #fff; padding: 34px 0 30px; }
.uni-band-title { font-size: 1.15rem; font-weight: 600; line-height: 1.4; color: var(--dark-text); text-align: center; margin: 0 0 22px; }

.uni-marquee { position: relative; display: flex; overflow: hidden; }
/* Degradado suave en los bordes */
.uni-marquee::before,
.uni-marquee::after { content: ''; position: absolute; top: 0; bottom: 0; width: 12%; max-width: 160px; z-index: 1; pointer-events: none; }
.uni-marquee::before { left: 0;  background: linear-gradient(to right, #fff, rgba(255,255,255,0)); }
.uni-marquee::after  { right: 0; background: linear-gradient(to left,  #fff, rgba(255,255,255,0)); }

/* Dos grupos idénticos: cada uno se desplaza -100% de su propio ancho, así el bucle no tiene saltos */
.uni-group { display: flex; flex-shrink: 0; align-items: center; justify-content: space-around; min-width: 100%; margin: 0; padding: 0; list-style: none; animation: uniScroll 45s linear infinite; }
.uni-group li { display: flex; align-items: center; flex-shrink: 0; padding: 0 36px; }
.uni-group img { display: block; height: 55px; width: auto; max-width: 170px; object-fit: contain; }
@keyframes uniScroll { from { transform: translateX(0); } to { transform: translateX(-100%); } }

/* Pausa al pasar el mouse */
.uni-marquee:hover .uni-group { animation-play-state: paused; }

@media (max-width: 768px) {
    .uni-band { padding: 26px 0 24px; }
    .uni-band-title { font-size: 1rem; margin-bottom: 18px; padding: 0 8px; }
    .uni-marquee::before, .uni-marquee::after { width: 40px; }
    .uni-group li { padding: 0 24px; }
    .uni-group img { height: 42px; max-width: 130px; }
}

/* Sin movimiento: los logos quedan fijos y centrados, sin duplicados */
@media (prefers-reduced-motion: reduce) {
    .uni-marquee { overflow: visible; }
    .uni-marquee::before, .uni-marquee::after { display: none; }
    .uni-group { animation: none; flex: 1 1 100%; min-width: 0; flex-wrap: wrap; justify-content: center; row-gap: 20px; }
    .uni-group[aria-hidden="true"] { display: none; }
}

/* ===== WHATSAPP — verde ===== */
:root { --whatsapp: #25D366; --whatsapp-btn: #13873F; --whatsapp-btn-hover: #0F7A38; }
.btn-whatsapp { background-color: var(--whatsapp-btn); color: #fff !important; border: none; font-weight: 500; border-radius: 8px; padding: 10px 22px; text-decoration: none; transition: all 0.3s ease; display: inline-block; cursor: pointer; }
.btn-whatsapp:hover { background-color: var(--whatsapp-btn-hover); transform: translateY(-2px); box-shadow: 0 8px 20px rgba(37,211,102,0.35); }
.btn-whatsapp:focus-visible { outline: 3px solid rgba(37,211,102,0.55); outline-offset: 2px; }
.text-whatsapp { color: var(--whatsapp) !important; }
.footer-link.text-whatsapp:hover { color: #4ade80 !important; }

/* ===== CONTACTO — versión clara: menos azul y letras de un solo criterio ===== */
#section-contacto.contacto-light { background: #fff; color: #1f2937; }
.contacto-light .label-tag { color: #64748b; }
.contacto-light .section-heading { color: #1f2937; }
.contacto-light .section-heading::after { background: var(--whatsapp-btn); }
.contacto-light .text-white { color: #1f2937 !important; }
.contacto-light .text-muted-custom { color: #4b5563 !important; }

.contacto-light .contact-info-card { background: #f8fafc; border: 1px solid #e5e7eb; }
.contacto-light .contact-info-icon { color: #374151; }
.contacto-light .contact-info-icon.icon-whatsapp { color: var(--whatsapp-btn); }
.contacto-light .contact-info-icon.icon-telegram { color: #1d6f9c; }
.contacto-light .text-whatsapp { color: var(--whatsapp-btn) !important; }
.contacto-light .text-telegram { color: #1d6f9c !important; }
.contacto-light .text-email { color: #1f2937 !important; }
.contacto-light .contact-info-card > div:last-child { min-width: 0; }
.contacto-light .contact-info-card a,
.contacto-light .contact-info-card span { overflow-wrap: anywhere; }

.contacto-light .bg-card-dark { background-color: #f8fafc !important; border: 1px solid #e5e7eb; }
.contacto-light .form-control,
.contacto-light .form-select { background-color: #fff !important; border: 1px solid #cbd5e1 !important; color: #111827 !important; }
.contacto-light .form-control:focus,
.contacto-light .form-select:focus { background-color: #fff !important; border-color: var(--whatsapp-btn) !important; box-shadow: 0 0 0 3px rgba(19,135,63,0.18) !important; color: #111827 !important; }
.contacto-light .form-control::placeholder { color: #6b7280 !important; }
.contacto-light .form-select option { background-color: #fff; color: #111827; }

.contacto-light .meta-banner { background: linear-gradient(135deg, #1f2937 0%, #111827 100%); border: none; }
.contacto-light .meta-banner .text-white,
.contacto-light .meta-banner .text-accent { color: #fff !important; }

/* ===== AJUSTES PARA CELULAR ===== */
@media (max-width: 768px) {
    .btn-whatsapp { padding: 12px 22px; min-height: 44px; }
}
@media (max-width: 576px) {
    /* Botones principales del hero a todo el ancho: más fáciles de tocar y sin que la flecha salte de línea */
    .hero .btn-lg { width: 100%; font-size: 1rem; }
}
@media (max-width: 992px) {
    /* El fondo fijo (fixed) se ve mal o consume mucho en iOS/Android: en pantallas chicas se desplaza con la página */
    .nosotros-bg { background-attachment: scroll; }
}