/* Configuración General y Colores (Modo Oscuro) */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #0f172a; /* Fondo azul oscuro/grisáceo */
    color: #f8fafc; /* Texto casi blanco */
    line-height: 1.6;
}

a {
    color: #38bdf8; /* Azul brillante para enlaces */
    text-decoration: none;
}

/* Barra de Navegación */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 10%;
    background-color: #1e293b;
    border-bottom: 1px solid #334155;
}

header .logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: #38bdf8;
}

header nav a {
    margin-left: 20px;
    color: #cbd5e1;
    transition: color 0.3s;
}

header nav a:hover {
    color: #38bdf8;
}

/* Sección de Bienvenida (Hero) */
.hero {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    height: 60vh;
    padding: 0 20px;
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    color: #94a3b8;
    margin-bottom: 2rem;
}

.btn {
    background-color: #38bdf8;
    color: #0f172a;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: bold;
    transition: background 0.3s;
}

.btn:hover {
    background-color: #7dd3fc;
}

/* Secciones de Contenido */
.section {
    padding: 4rem 10%;
}

.section h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: #38bdf8;
    border-bottom: 2px solid #1e293b;
    padding-bottom: 0.5rem;
}

.gray-bg {
    background-color: #1e293b;
}

/* Cuadrícula de Proyectos (Tarjetas) */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 2rem;
}

.project-card {
    background-color: #0f172a;
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid #334155;
    transition: transform 0.3s, border-color 0.3s;
}

.project-card:hover {
    transform: translateY(-5px);
    border-color: #38bdf8;
}

.project-card h3 {
    margin-bottom: 0.75rem;
    color: #f1f5f9;
}

.project-card p {
    color: #94a3b8;
    font-size: 0.95rem;
}

/* Pie de Página */
footer {
    text-align: center;
    padding: 2rem;
    background-color: #0f172a;
    border-top: 1px solid #1e293b;
    color: #64748b;
    font-size: 0.9rem;
}