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

html { scroll-behavior: smooth; scroll-padding-top: 90px; }

body {
    font-family: 'Segoe UI', sans-serif;
    color: #fff;
    overflow-x: hidden;
}

/* ===== VIDEO DE FONDO FIJO ===== */
#videoFondo {
    position: fixed;
    top: 0; left: 0;
    width: 100vw;
    height: 100vh;
    object-fit: cover;
    z-index: -2;
}

/* Overlay oscuro para legibilidad */
.overlay {
    position: fixed;
    top: 0; left: 0;
    width: 100vw; height: 100vh;
    background: rgba(0, 0, 0, 0.55);
    z-index: -1;
}

/* ===== HEADER FIJO ===== */
.header-fijo {
    position: fixed;
    top: 0; left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.55);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    transition: background 0.3s ease;
}

.header-fijo .navbar {
    padding: 0.5rem 0;
}

.logo {
    height: 55px;
    width: auto;
    transition: transform 0.3s ease;
}

.logo:hover { transform: scale(1.05); }

.navbar-nav .nav-link {
    color: #fff !important;
    font-weight: 500;
    padding: 0.5rem 1rem;
    position: relative;
    transition: color 0.3s ease;
}

.navbar-nav .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0; left: 50%;
    width: 0; height: 2px;
    background: #0d6efd;
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.navbar-nav .nav-link:hover::after,
.navbar-nav .nav-link.active::after { width: 80%; }

/* Botón hamburguesa en blanco */
.navbar-toggler {
    border-color: rgba(255,255,255,0.5);
}
.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3E%3Cpath stroke='rgba(255,255,255,0.9)' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3E%3C/svg%3E");
}

/* ===== SECCIONES ===== */
.seccion {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 100px 0 40px;
    position: relative;
}

.contenido {
    background: rgba(0, 0, 0, 0.35);
    border-radius: 12px;
    padding: 2.5rem;
    backdrop-filter: blur(4px);
    max-width: 800px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 991.98px) {
    .navbar-collapse {
        background: rgba(0, 0, 0, 0.85);
        margin-top: 0.5rem;
        border-radius: 8px;
        padding: 1rem;
    }
    .navbar-nav .nav-link::after { display: none; }
    .logo { height: 45px; }
}

@media (max-width: 575.98px) {
    .logo { height: 40px; }
    .contenido { padding: 1.5rem; }
    .display-4 { font-size: 2rem; }
}