body {
    font-family: 'Poppins', sans-serif;
    scroll-behavior: smooth;
    background-color: #f9f9f9;
}

header {
    background: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5)), url('../images/hero.jpg') center/cover no-repeat;
    color: #fff;
    padding: 17rem 0;
    min-height: 650px;
    text-align: center;
}

header h1 {
    font-weight: 700;
    font-size: 3rem;
}

header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

.section-title {
    font-weight: 700;
    margin-bottom: 2rem;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    width: 60%;
    height: 3px;
    background: #0d6efd;
    bottom: -10px;
    left: 20%;
    border-radius: 2px;
}

.project-img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    border-radius: 10px;
    transition: transform 0.3s ease;
}

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

footer {
    background: #0d6efd;
    color: white;
    padding: 2rem 0;
    text-align: center;
}

.social-icons a {
    color: white;
    font-size: 1.5rem;
    margin: 0 10px;
    transition: color 0.3s ease;
}

.social-icons a:hover {
    color: #ffd43b;
}

/* ===== Botón flotante de WhatsApp ===== */
.btn-whatsapp {
    position: fixed;
    bottom: 25px;
    right: 25px;
    background-color: #25D366;
    color: white;
    font-size: 1.8rem;
    padding: 14px 16px;
    border-radius: 50%;
    box-shadow: 0 3px 10px rgba(0,0,0,0.3);
    z-index: 1000;
    transition: all 0.3s ease;
    text-decoration: none;
}

.btn-whatsapp:hover {
    background-color: #1ebe5d;
    transform: scale(1.1);
    color: #fff;
}