/* DISEÑO PROFESIONAL PARA SALUD Y NUTRICIÓN */
:root {
    --primary-color: #2c7a7b; /* Verde médico */
    --secondary-color: #2d3748; /* Gris oscuro profesional */
    --accent-color: #f6ad55; /* Naranja suave para CTA */
    --bg-light: #f7fafc;
    --white: #ffffff;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--secondary-color);
    background-color: var(--bg-light);
}

header {
    background: var(--white);
    padding: 1rem 5%;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav a {
    margin-left: 20px;
    text-decoration: none;
    color: var(--secondary-color);
    font-weight: 600;
}

nav a:hover { color: var(--primary-color); }

.hero {
    background: linear-gradient(rgba(44, 122, 123, 0.8), rgba(44, 122, 123, 0.8)), url('https://images.unsplash.com/photo-1512621776951-a57141f2eefd?auto=format&fit=crop&w=1350&q=80');
    background-size: cover;
    color: white;
    padding: 100px 5%;
    text-align: center;
}

.container { width: 90%; max-width: 1100px; margin: auto; padding: 2rem 0; }

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

.card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    transition: transform 0.3s;
}

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

.btn {
    display: inline-block;
    background: var(--primary-color);
    color: white;
    padding: 10px 20px;
    text-decoration: none;
    border-radius: 5px;
    margin-top: 10px;
}

footer {
    background: var(--secondary-color);
    color: white;
    text-align: center;
    padding: 2rem;
    margin-top: 4rem;
}

/* Estilo para artículos extensos */
article { background: white; padding: 3rem; border-radius: 8px; }
article h1 { margin-bottom: 1.5rem; color: var(--primary-color); }
article h2 { margin-top: 2rem; color: var(--primary-color); }
article p { margin-bottom: 1.2rem; font-size: 1.1rem; }