:root {
    --primary: #2c3e50;
    --accent: #3498db;
    --bg: #f4f7f6;
}

body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background-color: var(--bg);
    margin: 0;
    padding: 20px;
    color: var(--primary);
}

header { text-align: center; margin-bottom: 40px; }

#filtros { margin-bottom: 20px; }

button {
    padding: 10px 20px;
    margin: 5px;
    cursor: pointer;
    border: none;
    background: var(--primary);
    color: white;
    border-radius: 5px;
    transition: 0.3s;
}

button:hover { background: var(--accent); }

.grid-proyectos {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.card {
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.2s;
}

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

.tag {
    display: inline-block;
    background: #eee;
    padding: 2px 8px;
    font-size: 0.8rem;
    border-radius: 3px;
    margin-top: 10px;
}

/* Fondo oscuro del modal */
#modal-proyecto {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    transition: 0.3s;
}

/* Clase para ocultarlo */
.modal-hidden {
    visibility: hidden;
    opacity: 0;
}

/* Caja blanca con el contenido */
.modal-contenido {
    background: white;
    padding: 30px;
    width: 90%;
    max-width: 600px;
    border-radius: 15px;
    position: relative;
    animation: aparecer 0.3s ease;
}

@keyframes aparecer {
    from { transform: translateY(-20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.cerrar-modal {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 30px;
    cursor: pointer;
}

.intro-seccion {
    max-width: 800px;
    margin: 0 auto 40px auto;
    text-align: center;
    border-bottom: 1px solid #ddd;
    padding-bottom: 20px;
}

.intro-seccion h2 {
    color: var(--primary);
    font-size: 2rem;
}