/* Variables de Diseño */
:root {
    --bg-color: #0f172a;
    --bg-alt: #1e293b;
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --accent-color: #38bdf8;
    --accent-hover: #0ea5e9;
    --btn-highlight: #10b981;
    --btn-highlight-hover: #059669;
    --card-bg: #1e293b;
    --border-color: #334155;
    --transition: all 0.3s ease;
}

[data-theme="light"] {
    --bg-color: #f8fafc;
    --bg-alt: #f1f5f9;
    --text-color: #0f172a;
    --text-muted: #475569;
    --accent-color: #0284c7;
    --accent-hover: #0369a1;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
}

/* Reset General */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: var(--transition);
    line-height: 1.6;
}

/* Navbar */
header {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

[data-theme="light"] header {
    background-color: rgba(248, 250, 252, 0.8);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
}

.logo span {
    color: var(--accent-color);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

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

#theme-toggle {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 0 1rem;
    background: radial-gradient(circle at top right, rgba(56, 189, 248, 0.1), transparent);
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 0.5rem;
}

.hero-content h2 {
    font-size: 1.5rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-weight: 400;
}

.tagline {
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto 2rem;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 600;
    cursor: pointer;
    border: none;
    font-size: 1rem;
    transition: var(--transition);
}

.btn.primary {
    background-color: var(--accent-color);
    color: #0f172a;
}

.btn.primary:hover {
    background-color: var(--accent-hover);
}

.btn.accent-btn {
    background-color: var(--btn-highlight);
    color: #ffffff;
}

.btn.accent-btn:hover {
    background-color: var(--btn-highlight-hover);
}

.btn.secondary {
    border: 1px solid var(--border-color);
    color: var(--text-color);
    background: transparent;
}

.btn.secondary:hover {
    background-color: var(--border-color);
}

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

.bg-alt {
    max-width: 100%;
    background-color: var(--bg-alt);
}

.bg-alt > * {
    max-width: 1200px;
    margin: 0 auto;
}

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

.section-title::after {
    content: '';
    display: block;
    width: 50px;
    height: 4px;
    background-color: var(--accent-color);
    margin: 0.5rem auto 0;
    border-radius: 2px;
}

/* Sobre Mí */
.about-container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
}

.about-text h3 {
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.about-text p {
    margin-bottom: 1rem;
    color: var(--text-muted);
}

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

.skill-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    text-align: center;
    transition: transform 0.3s ease;
}

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

.card-icon {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.skill-card h3 {
    margin-bottom: 1rem;
}

.skill-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Línea de tiempo */
.timeline {
    max-width: 800px;
    margin: 0 auto;
    border-left: 2px solid var(--border-color);
    padding-left: 2rem;
    position: relative;
}

.timeline-item {
    position: relative;
    margin-bottom: 2.5rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: calc(-2rem - 7px);
    top: 5px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--accent-color);
}

.timeline-date {
    font-weight: bold;
    color: var(--accent-color);
    margin-bottom: 0.25rem;
}

.timeline-content h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.timeline-content p {
    color: var(--text-muted);
}

/* Contacto y Footer */
.contact-sub {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
}

.contact-icon {
    color: var(--text-color);
    text-decoration: none;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.contact-icon:hover {
    color: var(--accent-color);
}

footer {
    text-align: center;
    padding: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Optimización para impresión manual y PDF exportado */
@media print {
    header, #theme-toggle, .cta-buttons, footer {
        display: none !important;
    }
    body {
        background-color: #ffffff !important;
        color: #000000 !important;
    }
    .about-container, .skill-card, .bg-alt {
        background-color: #ffffff !important;
        border: 1px solid #cbd5e1 !important;
        color: #000000 !important;
    }
    .text-muted, p {
        color: #334155 !important;
    }
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .hero-content h1 { font-size: 2.5rem; }
    .contact-links { flex-direction: column; align-items: center; gap: 1rem; }
}