/* --- Variables de Color y Estilo --- */
:root {
    /* Paleta de colores profesional: Azules oscuros y grises */
    --primary-color: #0f172a;    /* Azul muy oscuro (Slate 900) */
    --secondary-color: #334155;  /* Gris azulado (Slate 700) */
    --accent-color: #3b82f6;     /* Azul brillante para acentos (Blue 500) */
    --text-color: #1e293b;       /* Gris oscuro para texto principal (Slate 800) */
    --text-light: #64748b;       /* Gris medio para texto secundario (Slate 500) */
    --background-color: #f8fafc; /* Blanco grisáceo muy claro (Slate 50) */
    --card-bg: #ffffff;          /* Blanco puro */
    --border-color: #e2e8f0;     /* Gris claro para bordes */
    
    --font-main: 'Inter', sans-serif;
    --max-width: 1200px;
    --transition: all 0.3s ease;
}

/* --- Reset y Estilos Base --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: --font-main;
    font-family: 'Inter', sans-serif; /* Fallback explícito */
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 5rem 0;
}

.section-title {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 3rem;
    text-align: center;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background-color: var(--accent-color);
    margin: 1rem auto 0;
    border-radius: 2px;
}

/* --- Navbar --- */
.navbar {
    background-color: var(--card-bg);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -1px;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    font-weight: 500;
    color: var(--secondary-color);
}

.nav-links a:hover {
    color: var(--accent-color);
}

/* --- Hero Section --- */
.hero {
    padding-top: 140px; /* Espacio para el navbar fijo + padding */
    padding-bottom: 5rem;
    background-color: var(--background-color);
}

.hero-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 4rem;
}

.hero-text {
    flex: 1;
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
}

.hero-image img {
    border-radius: 20px;
    box-shadow: 20px 20px 0 var(--accent-color); /* Estilo moderno desplazado */
    max-width: 350px;
    width: 100%;
}

.greeting {
    display: block;
    font-size: 1.1rem;
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.role {
    font-size: 1.5rem;
    color: var(--secondary-color);
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.bio {
    color: var(--text-light);
    font-size: 1.1rem;
    margin-bottom: 2rem;
    max-width: 600px;
}

.social-links {
    display: flex;
    gap: 1.5rem;
}

.social-links a {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 45px;
    height: 45px;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    color: var(--secondary-color);
    font-size: 1.2rem;
}

.social-links a:hover {
    background-color: var(--accent-color);
    color: #fff;
    border-color: var(--accent-color);
    transform: translateY(-3px);
}

/* --- Certificaciones --- */
.certifications {
    background-color: var(--card-bg);
}

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

.cert-card {
    background: var(--background-color);
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid transparent;
}

.cert-card:hover {
    border-color: var(--accent-color);
    transform: translateY(-5px);
}

.cert-icon {
    font-size: 3rem;
    color: #FF9900; /* Color naranja AWS */
    margin-bottom: 1rem;
}

.cert-card h3 {
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
}

.cert-card .date {
    display: block;
    margin-top: 1rem;
    font-size: 0.9rem;
    color: var(--text-light);
}

/* --- Skills --- */
.skills-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
}

.skill-item {
    background-color: var(--card-bg);
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    font-weight: 500;
    color: var(--secondary-color);
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.03);
    transition: var(--transition);
}

.skill-item:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

/* --- Experiencia (Timeline) --- */
.experience {
    background-color: var(--card-bg);
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

/* Línea central */
.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 20px; /* Móvil por defecto: línea a la izquierda */
    width: 2px;
    background: var(--border-color);
}

.timeline-item {
    position: relative;
    padding-left: 50px;
    margin-bottom: 3rem;
}

.timeline-dot {
    position: absolute;
    left: 11px;
    top: 0;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent-color);
    border: 4px solid #fff;
    box-shadow: 0 0 0 2px var(--accent-color);
}

.timeline-content h3 {
    font-size: 1.2rem;
    color: var(--primary-color);
}

.timeline-content h4 {
    font-size: 1rem;
    color: var(--secondary-color);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.timeline-date {
    display: inline-block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent-color);
}

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

.project-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}

.project-card h3 {
    font-size: 1.4rem;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
}

.project-card p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    flex-grow: 1; /* Para alinear botones al final */
}

.project-tags {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.project-tags span {
    font-size: 0.8rem;
    background-color: #f1f5f9;
    color: var(--secondary-color);
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
}

.btn-small {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--accent-color);
    font-size: 0.95rem;
}

.btn-small:hover {
    text-decoration: underline;
}

/* --- Footer --- */
.footer {
    padding: 2rem 0;
    text-align: center;
    background-color: var(--primary-color);
    color: #fff;
    font-size: 0.9rem;
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.visitor-counter-container {
    background-color: rgba(255, 255, 255, 0.1);
    display: inline-block;
    padding: 0.5rem 1.5rem;
    border-radius: 20px;
    margin: 0 auto;
}

.counter-number {
    font-weight: 700;
    color: var(--accent-color);
}

/* --- Responsive Media Queries --- */
@media (max-width: 768px) {
    .nav-links {
        display: none; /* Simplificado para este ejercicio, idealmente sería un menú hamburguesa */
    }
    
    .nav-content {
        justify-content: center;
    }

    .hero-content {
        flex-direction: column-reverse;
        text-align: center;
        gap: 2rem;
    }
    
    .social-links {
        justify-content: center;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .timeline::before {
        left: 20px;
    }
}