.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.15);
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0;
}

.nav-logo img {
    height: 40px;
    transition: transform 0.3s ease;
}

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

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2.5rem;
    margin: 0;
    padding: 0;
}

.nav-link {
    text-decoration: none;
    color: var(--dark-color);
    font-weight: 500;
    font-size: 1rem;
    transition: all 0.3s ease;
    position: relative;
    padding: 0.5rem 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.nav-actions {
    display: flex;
    gap: 1rem;
}

.nav-button {
    background: linear-gradient(135deg, var(--primary-color) 0%, #e67c45 100%);
    color: var(--white);
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: 25px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 4px 15px rgba(238, 94, 49, 0.3);
}

.nav-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(238, 94, 49, 0.4);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--dark-color);
    transition: all 0.3s ease;
    border-radius: 2px;
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--white);
        flex-direction: column;
        align-items: center;
        justify-content: flex-start;
        padding-top: 2rem;
        gap: 0;
        transition: left 0.3s ease;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-link {
        padding: 1rem 2rem;
        font-size: 1.1rem;
        width: 100%;
        text-align: center;
        border-bottom: 1px solid #f0f0f0;
    }

    .nav-link::after {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }

    .nav-actions {
        display: none;
    }
}
  /* Estilos para menús desplegables */
        .nav-menu {
            display: flex;
            list-style: none;
            gap: 2rem;
            margin: 0;
            padding: 0;
        }

        .nav-item {
            position: relative;
        }

        .nav-link {
            text-decoration: none;
            color: var(--dark-color);
            font-weight: 500;
            font-size: 1rem;
            transition: all 0.3s ease;
            position: relative;
            padding: 0.5rem 0;
            display: flex;
            align-items: center;
            gap: 0.3rem;
        }

        .nav-link i {
            font-size: 0.8rem;
            transition: transform 0.3s ease;
        }

        .nav-item:hover .nav-link i {
            transform: rotate(180deg);
        }

        .dropdown-menu {
            position: absolute;
            top: 100%;
            left: 0;
            background: var(--white);
            min-width: 220px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
            border-radius: 12px;
            padding: 0.8rem 0;
            opacity: 0;
            visibility: hidden;
            transform: translateY(10px);
            transition: all 0.3s ease;
            z-index: 1000;
        }

        .nav-item:hover .dropdown-menu {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }

        .dropdown-item {
            display: block;
            padding: 0.7rem 1.5rem;
            color: var(--dark-color);
            text-decoration: none;
            transition: all 0.3s ease;
            font-size: 0.9rem;
        }

        .dropdown-item:hover {
            background: var(--light-color);
            color: var(--primary-color);
            padding-left: 1.8rem;
        }

        .dropdown-divider {
            height: 1px;
            background: #f0f0f0;
            margin: 0.5rem 0;
        }

        /* Estilos para nuevas secciones */
        .memberships {
            padding: 5rem 0;
            background: var(--light-color);
        }

        .memberships-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-top: 3rem;
        }

        .membership-card {
            background: var(--white);
            border-radius: 15px;
            padding: 2rem;
            text-align: center;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .membership-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
        }

        .membership-logo {
            height: 80px;
            margin-bottom: 1.5rem;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .membership-logo img {
            max-height: 100%;
            max-width: 100%;
            filter: grayscale(100%);
            transition: filter 0.3s ease;
        }

        .membership-card:hover .membership-logo img {
            filter: grayscale(0%);
        }

        .research-projects {
            padding: 5rem 0;
        }

        .projects-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin-top: 3rem;
        }

        .project-card {
            background: var(--white);
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
            transition: transform 0.3s ease;
        }

        .project-card:hover {
            transform: translateY(-5px);
        }

        .project-image {
            height: 200px;
            overflow: hidden;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, #7b68ee, var(--primary-color));
        }

        .project-icon {
            font-size: 3.5rem;
            color: var(--white);
            opacity: 0.9;
            transition: all 0.3s ease;
        }

        .project-card:hover .project-icon {
            transform: scale(1.1);
            opacity: 1;
        }

        .project-content {
            padding: 1.5rem;
        }

        .project-category {
            display: inline-block;
            background: var(--primary-color);
            color: var(--white);
            padding: 0.3rem 0.8rem;
            border-radius: 20px;
            font-size: 0.8rem;
            margin-bottom: 1rem;
        }

        .collaborations {
            padding: 5rem 0;
            background: var(--light-color);
        }

        .collaboration-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 2rem;
            margin-top: 3rem;
        }

        .collaboration-card {
            background: var(--white);
            border-radius: 15px;
            padding: 2rem;
            text-align: center;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
        }

        .collaboration-icon {
            width: 70px;
            height: 70px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
        }

        .collaboration-icon i {
            font-size: 1.8rem;
            color: var(--white);
        }

        /* Responsive */
        @media (max-width: 768px) {
            .dropdown-menu {
                position: static;
                opacity: 1;
                visibility: visible;
                transform: none;
                box-shadow: none;
                background: transparent;
                padding: 0;
                display: none;
            }

            .nav-item.active .dropdown-menu {
                display: block;
            }

            .dropdown-item {
                padding: 0.5rem 1rem;
                border-left: 3px solid transparent;
            }

            .dropdown-item:hover {
                border-left-color: var(--primary-color);
            }
        }