/* ============================================
   Sistema de Diseño
   ============================================ */
:root {
    /* Colores principales */
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #ec4899;
    --accent-color: #10b981;

    /* Fondo y superficies */
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-dark: #111827;
    --bg-darker: #0b1120;

    /* Tipografía */
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --text-white: #ffffff;
    --font-primary: 'Poppins', sans-serif;
    --font-code: 'Fira Code', monospace;

    /* Sombras */
    --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.08);
    --shadow-md: 0 10px 30px rgba(15, 23, 42, 0.12);
    --shadow-lg: 0 30px 50px rgba(15, 23, 42, 0.15);
    --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.45);

    /* Espaciado y formas */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1.5rem;
    --radius-full: 9999px;

    /* Misceláneos */
    --max-width: 1200px;
    --navbar-height: 80px;
    --transition-fast: 0.2s ease;
    --transition-base: 0.35s ease;
    --transition-slow: 0.6s ease;

    /* Gradientes */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #ec4899 100%);
    --gradient-secondary: linear-gradient(135deg, #10b981 0%, #6366f1 100%);
    --gradient-overlay: linear-gradient(135deg, rgba(99, 102, 241, 0.9) 0%, rgba(236, 72, 153, 0.9) 100%);
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #111827;
    --bg-dark: #020617;
    --bg-darker: #00010a;

    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-light: #64748b;

    --shadow-sm: 0 1px 2px rgba(2, 6, 23, 0.25);
    --shadow-md: 0 15px 35px rgba(15, 23, 42, 0.45);
    --shadow-lg: 0 35px 65px rgba(15, 23, 42, 0.55);
}

/* ============================================
   Reset & Base
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition-base), color var(--transition-base);
}

::selection {
    background-color: var(--primary-color);
    color: var(--text-white);
}

a {
    color: inherit;
}

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

/* ============================================
   Utilidades
   ============================================ */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-3xl) 0;
    position: relative;
}

.section-dark {
    background-color: var(--bg-secondary);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-subtitle {
    font-size: 0.95rem;
    letter-spacing: 0.3rem;
    text-transform: uppercase;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.section-title {
    font-size: clamp(2.25rem, 4vw, 3rem);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.section-description {
    max-width: 620px;
    margin: 0 auto;
    color: var(--text-secondary);
}

/* ============================================
   Navegación
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--navbar-height);
    display: flex;
    align-items: center;
    background-color: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-base);
}

[data-theme="dark"] .navbar {
    background-color: rgba(15, 23, 42, 0.92);
}

.navbar.scrolled {
    height: 70px;
    box-shadow: var(--shadow-md);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.nav-brand a {
    font-size: 1.6rem;
    font-weight: 700;
    text-decoration: none;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-family: var(--font-code);
    transition: transform var(--transition-fast);
}

.nav-brand a:hover {
    transform: scale(1.05);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-list {
    display: flex;
    gap: var(--spacing-md);
    list-style: none;
}

.nav-link {
    position: relative;
    font-weight: 500;
    text-decoration: none;
    color: var(--text-primary);
    padding: 0.4rem 0.6rem;
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    left: 50%;
    bottom: -6px;
    width: 0;
    height: 3px;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    transform: translateX(-50%);
    transition: width var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 80%;
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    border: 2px solid var(--text-light);
    background: transparent;
    color: var(--text-primary);
    display: grid;
    place-items: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: rotate(15deg);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
}

.nav-toggle span {
    width: 28px;
    height: 3px;
    border-radius: var(--radius-full);
    background-color: var(--text-primary);
    transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* ============================================
   Hero
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--navbar-height);
    position: relative;
    overflow: hidden;
}

.hero-particles {
    position: absolute;
    inset: 0;
    opacity: 0.5;
    z-index: 0;
    pointer-events: none;
}

.hero .container {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--spacing-2xl);
    align-items: center;
}

.hero-content {
    animation: fadeInUp 1s ease forwards;
}

.hero-greeting {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.05;
    margin-bottom: var(--spacing-sm);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1.6rem, 4vw, 2.4rem);
    font-weight: 600;
    color: var(--text-secondary);
    min-height: 60px;
    margin-bottom: var(--spacing-md);
}

.typing-text {
    position: relative;
    color: var(--primary-color);
}

.typing-text::after {
    content: '|';
    position: absolute;
    right: -12px;
    animation: blink 1s infinite;
}

.hero-description {
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.btn {
    display: inline-flex;
    gap: var(--spacing-xs);
    align-items: center;
    justify-content: center;
    padding: 0.85rem 1.8rem;
    border-radius: var(--radius-full);
    border: none;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: var(--bg-secondary);
    border: 2px solid transparent;
}

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

.btn-outline {
    border: 2px solid var(--text-secondary);
    background: transparent;
}

.btn-outline:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.btn-block {
    width: 100%;
}

.hero-social {
    display: flex;
    gap: var(--spacing-sm);
}

.hero-social a {
    width: 45px;
    height: 45px;
    border-radius: var(--radius-full);
    border: 2px solid var(--text-light);
    display: grid;
    place-items: center;
    font-size: 1.2rem;
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.hero-social a:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.hero-image {
    animation: fadeInRight 1.1s ease forwards;
}

.image-wrapper {
    position: relative;
    max-width: 460px;
    margin: 0 auto;
}

.image-wrapper img {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    position: relative;
    z-index: 2;
}

.image-decoration {
    position: absolute;
    inset: 20px -25px -20px 25px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    z-index: 1;
    opacity: 0.25;
    filter: blur(10px);
    display: none; /* Desactivado para evitar sombra no deseada */
}

.scroll-indicator {
    position: absolute;
    bottom: 35px;
    left: 50%;
    transform: translateX(-50%);
}

.mouse {
    width: 36px;
    height: 60px;
    border-radius: var(--radius-full);
    border: 2px solid var(--text-light);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 10px;
}

.wheel {
    width: 6px;
    height: 12px;
    border-radius: var(--radius-full);
    background: var(--primary-color);
    animation: scroll 2s infinite;
}

/* ============================================
   About
   ============================================ */
.about-content {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--spacing-2xl);
    align-items: start;
}

.about-image {
    position: relative;
}

.about-image img {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.about-image video {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    background-color: var(--bg-primary);
    box-shadow: var(--shadow-sm);
}

.stat-number {
    font-size: 2.25rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.1rem;
    color: var(--text-secondary);
}

.about-text h3 {
    font-size: 1.9rem;
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.about-info {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--spacing-sm);
}

.info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
}

.info-item i {
    font-size: 1.1rem;
    color: var(--primary-color);
}

/* ============================================
   Skills
   ============================================ */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-lg);
}

.skill-category {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.skill-category:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.category-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-md);
    background: var(--gradient-primary);
    display: grid;
    place-items: center;
    color: var(--text-white);
    font-size: 1.8rem;
}

.skill-items {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--spacing-sm);
}

@media (min-width: 1024px) {
    .skill-items {
        grid-template-columns: repeat(2, 1fr);
    }
}

.skill-item {
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
    color: var(--text-secondary);
    transition: color var(--transition-fast), transform var(--transition-fast);
}

.skill-item:hover {
    color: var(--primary-color);
    transform: translateX(6px);
}

/* ============================================
   Projects
   ============================================ */
.project-filter {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-2xl);
}

.filter-btn {
    padding: 0.65rem 1.6rem;
    border-radius: var(--radius-full);
    border: 2px solid var(--text-light);
    background: transparent;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--gradient-primary);
    border-color: transparent;
    color: var(--text-white);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.project-card {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.project-image {
    position: relative;
    height: 240px;
    overflow: hidden;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.project-card:hover .project-image img {
    transform: scale(1.08);
}

.project-overlay {
    position: absolute;
    inset: 0;
    background: var(--gradient-overlay);
    opacity: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity var(--transition-base);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-links {
    display: flex;
    gap: var(--spacing-sm);
}

.project-link {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background: var(--text-white);
    color: var(--primary-color);
    display: grid;
    place-items: center;
    font-size: 1.2rem;
    text-decoration: none;
    transition: transform var(--transition-fast);
}

.project-link:hover {
    transform: scale(1.1) rotate(6deg);
}

.project-content {
    padding: var(--spacing-lg);
}

.project-content h3 {
    font-size: 1.35rem;
    margin-bottom: var(--spacing-xs);
}

.project-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.tag {
    padding: 0.3rem 0.9rem;
    background: var(--bg-secondary);
    color: var(--primary-color);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 500;
}

/* ============================================
   Timeline
   ============================================ */
.timeline {
    position: relative;
    padding: var(--spacing-lg) 0;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    width: 2px;
    height: 100%;
    background: var(--gradient-primary);
    transform: translateX(-50%);
}

.timeline-item {
    display: grid;
    grid-template-columns: 1fr 80px 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
    align-items: center;
}

.timeline-item:nth-child(even) .timeline-content {
    grid-column: 1 / 2;
    grid-row: 1;
}

.timeline-item:nth-child(even) .timeline-icon {
    grid-column: 2 / 3;
    grid-row: 1;
}

.timeline-icon {
    grid-column: 2;
    grid-row: 1;
    width: 80px;
    height: 80px;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    display: grid;
    place-items: center;
    color: var(--text-white);
    font-size: 1.6rem;
    box-shadow: var(--shadow-md);
    position: relative;
    z-index: 2;
    margin: 0 auto;
}

.timeline-content {
    grid-column: 3;
    grid-row: 1;
    background: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.timeline-content:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.timeline-date {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--gradient-primary);
    color: var(--text-white);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.timeline-content h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
}

.timeline-content h4 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.timeline-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.6;
}

.timeline-content ul {
    padding-left: var(--spacing-md);
    color: var(--text-secondary);
}

.timeline-content li {
    margin-bottom: var(--spacing-xs);
}

/* ============================================
   Contact
   ============================================ */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-2xl);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.contact-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.contact-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-md);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-white);
    font-size: 1.25rem;
    flex-shrink: 0;
}

.contact-details h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
}

.contact-details p {
    color: var(--text-secondary);
}

.contact-social {
    margin-top: var(--spacing-md);
}

.contact-social h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
}

.social-links a {
    width: 45px;
    height: 45px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    font-size: 1.25rem;
    transition: all var(--transition-fast);
}

.social-links a:hover {
    background: var(--gradient-primary);
    color: var(--text-white);
    transform: translateY(-3px);
}

/* Contact Form */
.contact-form {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.form-group {
    position: relative;
    margin-bottom: var(--spacing-lg);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--text-light);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group label {
    position: absolute;
    left: var(--spacing-md);
    top: var(--spacing-md);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    pointer-events: none;
}

.form-group input:focus + label,
.form-group input:valid + label,
.form-group textarea:focus + label,
.form-group textarea:valid + label {
    top: -10px;
    left: 10px;
    font-size: 0.875rem;
    background: var(--bg-secondary);
    padding: 0 0.5rem;
    color: var(--primary-color);
}

.form-message {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    display: none;
}

.form-message.success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent-color);
    border: 1px solid var(--accent-color);
    display: block;
}

.form-message.error {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border: 1px solid #ef4444;
    display: block;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--bg-dark);
    color: var(--text-light);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-brand h3 {
    font-family: var(--font-code);
    font-size: 1.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.footer-brand p {
    color: var(--text-light);
    font-size: 0.875rem;
}

.footer-links h4,
.footer-contact h4 {
    color: var(--text-white);
    margin-bottom: var(--spacing-md);
    font-size: 1.125rem;
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-links a {
    color: var(--text-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--primary-color);
}

.footer-contact p {
    margin-bottom: var(--spacing-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.footer-contact i {
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: var(--text-light);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-xs);
}

.footer-bottom i {
    color: #ef4444;
}

/* ============================================
   Scroll to Top
   ============================================ */
.scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    color: var(--text-white);
    border: none;
    border-radius: var(--radius-full);
    font-size: 1.25rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 999;
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

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

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

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

@keyframes scroll {
    0% { transform: translateY(0); }
    30% { transform: translateY(10px); }
    100% { transform: translateY(0); }
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 968px) {
    .section-title {
        font-size: 2rem;
    }

    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-title {
        font-size: 3rem;
    }

    .hero-subtitle {
        font-size: 1.5rem;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-social {
        justify-content: center;
    }

    .hero-image {
        order: -1;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .skills-grid {
        grid-template-columns: 1fr;
    }

    .timeline::before {
        left: 40px;
    }

    .timeline-item {
        grid-template-columns: 80px 1fr;
        gap: var(--spacing-md);
    }

    .timeline-item:nth-child(even) .timeline-content {
        grid-column: 2;
    }

    .timeline-icon {
        grid-column: 1;
        grid-row: 1;
    }

    .timeline-content {
        grid-column: 2;
        grid-row: 1;
    }

    .contact-wrapper {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        height: 100vh;
        background: var(--bg-primary);
        flex-direction: column;
        justify-content: center;
        transition: right var(--transition-base);
        box-shadow: var(--shadow-xl);
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-list {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-lg);
    }

    .nav-toggle {
        display: flex;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }

    .about-stats {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.25rem;
    }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .about-info {
        grid-template-columns: 1fr;
    }

    .contact-form {
        padding: var(--spacing-md);
    }
}