/* Variables de CSS - Paleta Profesional */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --accent-primary: #1e40af;
    --accent-secondary: #3b82f6;
    --accent-light: #60a5fa;
    --accent-navy: #1e293b;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --card-bg: #ffffff;
    --card-border: #e2e8f0;
    --shadow-light: rgba(0, 0, 0, 0.05);
    --shadow-medium: rgba(0, 0, 0, 0.1);
    --shadow-heavy: rgba(0, 0, 0, 0.15);
}

/* Reset y estilos base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    letter-spacing: -0.01em;
}

/* Fondo profesional sutil */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    z-index: -1;
}

/* Navegación */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    box-shadow: 0 1px 3px var(--shadow-light);
    border-bottom: 1px solid var(--card-border);
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2rem;
    padding: 0 1rem;
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.2s ease;
    position: relative;
    font-weight: 500;
    font-size: 0.9rem;
    letter-spacing: 0;
    padding: 0.5rem 1rem;
    border-radius: 6px;
}

nav a:hover {
    color: var(--accent-primary);
    background: var(--bg-tertiary);
}

nav a.active {
    color: var(--accent-primary);
    background: var(--bg-tertiary);
}

/* Sección Hero */
.hero {
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8rem 2rem 4rem;
    position: relative;
    background: var(--bg-primary);
}

.hero-content {
    text-align: center;
    max-width: 800px;
    animation: fadeInUp 0.8s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero h1 {
    font-size: clamp(2.8rem, 5vw, 4.5rem);
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.hero h2 {
    color: var(--accent-primary);
    font-size: 1.4rem;
    margin-bottom: 1.5rem;
    font-weight: 500;
    letter-spacing: -0.01em;
}

.hero-links {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 2rem;
}

.hero-links a {
    padding: 0.75rem 1.5rem;
    background: var(--card-bg);
    color: var(--accent-primary);
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.2s ease;
    border: 1px solid var(--card-border);
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0;
}

.hero-links a:hover {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-medium);
}

/* Secciones generales */
section {
    padding: 5rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    font-size: 2.2rem;
    margin-bottom: 3rem;
    text-align: center;
    position: relative;
    color: var(--text-primary);
    font-weight: 600;
    letter-spacing: -0.01em;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--accent-primary);
    border-radius: 2px;
}

/* Sección About */
.about-content {
    background: var(--card-bg);
    padding: 3rem;
    border-radius: 12px;
    box-shadow: 0 2px 8px var(--shadow-light);
    line-height: 1.8;
    font-size: 1.1rem;
    border: 1px solid var(--card-border);
    position: relative;
    max-width: 700px;
    margin: 0 auto;
}

.about-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-primary);
    border-radius: 12px 12px 0 0;
}

/* Timeline de experiencia */
.timeline {
    position: relative;
    padding: 2rem 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background: var(--card-border);
}

.timeline-item {
    position: relative;
    margin: 3rem 0;
    opacity: 0;
    animation: fadeIn 0.8s ease forwards;
}

.timeline-item:nth-child(odd) .timeline-content {
    margin-right: 51%;
    text-align: right;
}

.timeline-item:nth-child(even) .timeline-content {
    margin-left: 51%;
}

.timeline-content {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 2px 8px var(--shadow-light);
    transition: all 0.2s ease;
    border: 1px solid var(--card-border);
}

.timeline-content:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px var(--shadow-medium);
    border-color: var(--accent-primary);
}

.timeline-date {
    color: var(--accent-primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    letter-spacing: 0;
}

.timeline-title {
    color: var(--text-primary);
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.timeline-company {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-style: italic;
}

.timeline-dot {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 12px;
    height: 12px;
    background: var(--accent-primary);
    border-radius: 50%;
    top: 2rem;
    border: 3px solid var(--bg-primary);
    box-shadow: 0 0 0 2px var(--accent-primary);
}

/* Grid de habilidades */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.skill-category {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    transition: all 0.2s ease;
    border: 1px solid var(--card-border);
    position: relative;
}

.skill-category::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-primary);
    border-radius: 12px 12px 0 0;
    transform: scaleX(0);
    transition: transform 0.2s ease;
}

.skill-category:hover::before {
    transform: scaleX(1);
}

.skill-category:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px var(--shadow-medium);
    border-color: var(--accent-primary);
}

.skill-category h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 1.1rem;
    letter-spacing: 0;
    font-weight: 600;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.skill-tag {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    font-size: 0.85rem;
    border: none;
    transition: all 0.2s ease;
    font-weight: 500;
}

.skill-tag:hover {
    background: var(--accent-primary);
    color: white;
    transform: translateY(-1px);
}

/* Barras de idiomas */
.language-item {
    margin: 1.5rem 0;
}

.language-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.language-bar {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
}

.language-progress {
    height: 100%;
    background: var(--accent-primary);
    border-radius: 4px;
    animation: fillBar 2s ease forwards;
}

@keyframes fillBar {
    from { width: 0; }
}

/* Publicaciones */
.publication-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    border-left: 4px solid var(--accent-primary);
    transition: all 0.2s ease;
    border: 1px solid var(--card-border);
    border-left: 4px solid var(--accent-primary);
}

.publication-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px var(--shadow-medium);
}

.publication-card h3 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

/* Sección de contacto */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    text-align: center;
}

.contact-item {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    transition: all 0.2s ease;
    border: 1px solid var(--card-border);
    position: relative;
}

.contact-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px var(--shadow-medium);
    border-color: var(--accent-primary);
}

.contact-item h3 {
    color: var(--accent-primary);
    margin-bottom: 1rem;
    font-weight: 600;
    letter-spacing: 0;
}

.contact-item a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
    font-weight: 500;
}

.contact-item a:hover {
    color: var(--accent-primary);
}

/* Botón flotante */
.fab {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--accent-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    box-shadow: 0 4px 12px var(--shadow-medium);
    transition: all 0.2s ease;
    text-decoration: none;
}

.fab:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px var(--shadow-heavy);
}

/* Animaciones de scroll */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

/* Scrollbar personalizado */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .timeline::before {
        left: 30px;
    }

    .timeline-item .timeline-content {
        margin-left: 60px !important;
        margin-right: 0 !important;
        text-align: left !important;
    }

    .timeline-dot {
        left: 30px;
    }

    nav ul {
        gap: 1rem;
        font-size: 0.9rem;
    }
}