:root {
    /* Colores principales */
    --primary-color: #1abc9c;
    --primary-dark: #16a085;
    --secondary-color: #2c3e50;
    --secondary-light: #34495e;

    /* Escala de grises */
    --text-color: #333;
    --text-light: #666;
    --bg-color: #f9f9f9;
    --card-bg: #fff;
    --nav-bg: rgba(255, 255, 255, 0.95);
    --border-color: #e0e0e0;
    --border-light: #f0f0f0;

    /* Efectos */
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --shadow-hover: 0 8px 25px rgba(0, 0, 0, 0.2);
    --transition: all 0.3s ease;
    --transition-fast: all 0.15s ease;

    /* Espaciado */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;

    /* Border radius */
    --radius-sm: 5px;
    --radius-md: 10px;
    --radius-lg: 15px;
}

/* Tema oscuro */
[data-theme="dark"] {
    --primary-color: #1abc9c;
    --primary-dark: #16a085;
    --secondary-color: #ecf0f1;
    --secondary-light: #bdc3c7;
    --text-color: #ecf0f1;
    --text-light: #bdc3c7;
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --nav-bg: rgba(30, 30, 30, 0.95);
    --border-color: #333;
    --border-light: #444;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.4);
    --shadow-hover: 0 8px 25px rgba(0, 0, 0, 0.5);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
    transition: var(--transition);
    overflow-x: hidden;
}

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

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* Skip link para accesibilidad */
.skip-link {
    position: absolute;
    top: -40px;
    left: var(--space-sm);
    background: var(--primary-color);
    color: white;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    z-index: 10000;
    transition: var(--transition);
}

.skip-link:focus {
    top: var(--space-sm);
}

/* Barra de progreso de lectura */
.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), #3498db);
    z-index: 9999;
    transition: width 0.3s ease;
}

/* Header y navegación */
header {
    background-color: var(--nav-bg);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

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

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

.nav-links li {
    margin-left: var(--space-lg);
}

.nav-links a {
    color: var(--text-color);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.nav-controls {
    display: flex;
    align-items: center;
}

.theme-toggle, .menu-toggle, .language-toggle {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
    margin-left: var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs);
    border-radius: var(--radius-sm);
}

.theme-toggle:hover, .menu-toggle:hover, .language-toggle:hover {
    color: var(--primary-color);
    background-color: rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .theme-toggle:hover,
[data-theme="dark"] .menu-toggle:hover,
[data-theme="dark"] .language-toggle:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.language-text {
    font-size: 0.9rem;
    font-weight: 500;
}

.menu-toggle {
    display: none;
}

/* Layout principal */
.main-content {
    display: flex;
    margin-top: 70px;
    gap: var(--space-lg);
}

/* Tarjeta de perfil */
.profile-card {
    width: 350px;
    padding: var(--space-lg);
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    margin: var(--space-lg) var(--space-sm);
    position: sticky;
    top: 90px;
    align-self: flex-start;
    transition: var(--transition);
}

.profile-img {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto var(--space-md);
    display: block;
    border: 5px solid var(--primary-color);
    transition: var(--transition);
}

.profile-img:hover {
    transform: scale(1.05);
}

.profile-name {
    text-align: center;
    font-size: 1.8rem;
    margin-bottom: var(--space-xs);
    color: var(--primary-color);
}

.profile-title {
    text-align: center;
    font-size: 1rem;
    color: var(--text-color);
    margin-bottom: var(--space-md);
    opacity: 0.8;
}

.social-links {
    display: flex;
    justify-content: center;
    margin-top: var(--space-md);
}

.social-links a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 var(--space-xs);
    transition: var(--transition);
}

.social-links a:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
    background-color: var(--primary-dark);
}

/* Secciones de contenido */
.content {
    flex: 1;
    padding: var(--space-lg) var(--space-sm);
}

section {
    margin-bottom: var(--space-xl);
    padding: var(--space-lg);
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

section.visible {
    opacity: 1;
    transform: translateY(0);
}

section h2 {
    font-size: 1.8rem;
    margin-bottom: var(--space-md);
    color: var(--primary-color);
    position: relative;
    padding-bottom: var(--space-xs);
}

section h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background-color: var(--primary-color);
}

.skills-subtitle {
    margin-top: var(--space-lg);
    color: var(--primary-color);
    font-size: 1.2rem;
}

/* Sección Sobre mí */
.about-text p {
    margin-bottom: var(--space-md);
}

/* Sección Habilidades */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--space-md);
    margin-top: var(--space-md);
}

.skill-item {
    background-color: var(--card-bg);
    border-radius: var(--radius-md);
    padding: var(--space-md) var(--space-sm);
    text-align: center;
    border: 2px solid var(--border-color);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.skill-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-color);
}

.skill-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    position: relative;
    z-index: 2;
}

.skill-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    transition: var(--transition);
}

.skill-item:hover .skill-icon {
    transform: scale(1.1);
}

.skill-name {
    font-weight: 600;
    color: var(--text-color);
    font-size: 1rem;
}

/* Sección Experiencia y Estudios */
.timeline {
    position: relative;
    padding-left: 30px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 7px;
    top: 0;
    height: 100%;
    width: 2px;
    background-color: var(--primary-color);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--space-lg);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -30px;
    top: 5px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--primary-color);
    border: 2px solid var(--primary-color);
    transition: var(--transition);
}

.timeline-item:hover::before {
    transform: scale(1.2);
    box-shadow: 0 0 0 4px rgba(26, 188, 156, 0.2);
}

.timeline-date {
    font-size: 0.9rem;
    color: var(--primary-color);
    margin-bottom: var(--space-xs);
    font-weight: 600;
}

.timeline-title {
    font-size: 1.2rem;
    margin-bottom: var(--space-xs);
}

.timeline-company {
    font-weight: 500;
    margin-bottom: var(--space-xs);
    color: var(--text-color);
    opacity: 0.8;
}

.timeline-description {
    font-size: 0.95rem;
}

/* Sección Proyectos */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-md);
}

.project-card {
    background-color: var(--bg-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.project-image-placeholder {
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    color: white;
    gap: 15px;
    position: relative;
    overflow: hidden;
}

.project-image-placeholder {
    background: linear-gradient(135deg, var(--primary-color) 0%, #3498db 100%);
}

.tech-icons {
    display: flex;
    gap: 20px;
    justify-content: center;
    align-items: center;
}

.project-tech-icon {
    font-size: 2.5rem;
    opacity: 0.9;
    transition: var(--transition);
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.project-tech-icon:hover {
    transform: scale(1.1);
    opacity: 1;
}

.project-image-placeholder p {
    font-weight: 500;
    margin: 0;
    font-size: 0.9rem;
    text-align: center;
    padding: 0 10px;
}

.project-info {
    padding: var(--space-md);
}

.project-title {
    font-size: 1.2rem;
    margin-bottom: var(--space-sm);
}

.project-tech {
    margin: var(--space-sm) 0;
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
}

.tech-tag {
    background: var(--primary-color);
    color: white;
    padding: 3px 10px;
    border-radius: 15px;
    font-size: 0.8em;
    font-weight: 500;
    transition: var(--transition-fast);
}

.tech-tag:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.project-links {
    display: flex;
    margin-top: var(--space-md);
}

.project-links a {
    margin-right: var(--space-md);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    transition: var(--transition);
}

.project-links a:hover {
    color: var(--primary-dark);
    transform: translateX(3px);
}

.project-links i {
    margin-right: var(--space-xs);
}

/* Sección Contacto */
.contact-form .form-group {
    margin-bottom: var(--space-md);
}

.contact-form label {
    display: block;
    margin-bottom: var(--space-xs);
    font-weight: 500;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: var(--space-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: var(--transition);
    font-family: inherit;
}

.contact-form textarea {
    min-height: 150px;
    resize: vertical;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(26, 188, 156, 0.2);
}

.submit-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    min-height: 48px;
    width: 100%;
}

.submit-btn:hover:not(:disabled) {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.submit-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

/* Spinner de carga */
.loading-spinner {
    width: 16px;
    height: 16px;
    border: 2px solid transparent;
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

/* Mensajes del formulario */
.form-message {
    margin-top: var(--space-md);
    padding: var(--space-sm);
    border-radius: var(--radius-sm);
    text-align: center;
    display: none;
}

.form-message.success {
    background-color: rgba(52, 152, 219, 0.1);
    color: #2980b9;
    border: 1px solid #2980b9;
}

.form-message.error {
    background-color: rgba(231, 76, 60, 0.1);
    color: #c0392b;
    border: 1px solid #c0392b;
}

/* Banner CTA */
.cta-banner {
    background: linear-gradient(135deg, var(--primary-color) 0%, #3498db 100%);
    color: white;
    padding: var(--space-lg) 0;
    text-align: center;
    margin-top: var(--space-xl);
}

.cta-banner a {
    color: white;
    font-weight: 600;
    text-decoration: underline;
    transition: var(--transition);
}

.cta-banner a:hover {
    color: rgba(255, 255, 255, 0.9);
}

/* Botón Volver Arriba */
.back-to-top {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-lg);
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    z-index: 1000;
    box-shadow: var(--shadow-lg);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background-color: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

/* Footer */
footer {
    text-align: center;
    padding: var(--space-lg) 0;
    background-color: var(--card-bg);
    margin-top: var(--space-lg);
}

/* Diseño Responsive */
@media (max-width: 1200px) {
    .profile-card {
        width: 300px;
    }
}

@media (max-width: 992px) {
    .main-content {
        flex-direction: column;
    }

    .profile-card {
        width: 100%;
        position: static;
        margin: var(--space-sm) 0;
    }

    .content {
        padding: var(--space-sm) 0;
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 70px;
        right: -100%;
        width: 80%;
        height: calc(100vh - 70px);
        background-color: var(--nav-bg);
        flex-direction: column;
        align-items: center;
        justify-content: flex-start;
        padding-top: var(--space-lg);
        transition: var(--transition);
        box-shadow: var(--shadow-lg);
        backdrop-filter: blur(10px);
    }

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

    .nav-links li {
        margin: var(--space-md) 0;
    }

    .menu-toggle {
        display: block;
    }

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

    .skills-grid {
        grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
        gap: var(--space-sm);
    }

    .skill-item {
        padding: var(--space-md) var(--space-xs);
    }

    .skill-icon {
        font-size: 2rem;
    }

    section {
        padding: var(--space-md);
    }

    .project-tech-icon {
        font-size: 2rem;
    }

    .tech-icons {
        gap: 15px;
    }

    .project-image-placeholder p {
        font-size: 0.8rem;
    }

    .language-text {
        display: none;
    }

    .back-to-top {
        bottom: var(--space-md);
        right: var(--space-md);
        width: 45px;
        height: 45px;
    }
}

@media (max-width: 576px) {
    .container {
        padding: 0 15px;
    }

    .profile-img {
        width: 150px;
        height: 150px;
    }

    .nav-links {
        width: 100%;
    }

    .skills-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-sm);
    }

    .skill-item {
        padding: var(--space-sm) var(--space-xs);
    }

    .skill-icon {
        font-size: 1.8rem;
    }

    .skill-name {
        font-size: 0.9rem;
    }

    .project-tech-icon {
        font-size: 1.8rem;
    }

    .tech-icons {
        gap: 10px;
    }

    .back-to-top {
        bottom: var(--space-sm);
        right: var(--space-sm);
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
}

.hidden {
    display: none;
}

.cv-download {
    margin-top: var(--space-md);
    text-align: center;
}

.cv-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm) var(--space-md);
    background-color: var(--primary-color);
    color: white;
    border-radius: var(--radius-sm);
    font-weight: 500;
    transition: var(--transition);
    text-decoration: none;
    gap: var(--space-xs);
    width: 100%;
}

.cv-btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

@media (max-width: 768px) {
    .cv-btn {
        padding: var(--space-sm) var(--space-md);
        font-size: 0.9rem;
    }
}

@media (max-width: 576px) {
    .cv-btn {
        padding: var(--space-sm) var(--space-sm);
        font-size: 0.85rem;
    }
}