:root {
    --primary-color: #1a1a1a;
    --secondary-color: #666666;
    --bg-light: #fafaf8;
    --bg-dark: #0f1419;
    --text-light: #1a1a1a;
    --text-dark: #e6f1ff;
    --card-light: #ffffff;
    --card-dark: #1a2332;
    --border-light: #e5e5e5;
    --border-dark: #2d3f56;
    --border-radius: 1rem;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-light);
    background-color: var(--bg-light);
    transition: var(--transition);
}

body.dark-theme {
    background-color: var(--bg-dark);
    color: var(--text-dark);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navegación */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: var(--bg-light);
    border-bottom: 1px solid var(--border-light);
    z-index: 1000;
    transition: var(--transition);
}

body.dark-theme .navbar {
    background-color: var(--bg-dark);
    border-bottom: 1px solid var(--border-dark);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.nav-brand {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
    letter-spacing: 0.1em;
    border: 2px solid var(--primary-color);
    padding: 0.5rem 1rem;
    border-radius: 0.75rem;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
}

.nav-brand:hover {
    background-color: var(--primary-color);
    color: var(--bg-light);
}

body.dark-theme .nav-brand {
    border-color: var(--text-dark);
    color: var(--text-dark);
    background-color: var(--bg-dark);
}

body.dark-theme .nav-brand:hover {
    background-color: var(--text-dark);
    color: var(--bg-dark);
}

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

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

body.dark-theme .nav-menu a {
    color: var(--text-dark);
}

.nav-menu a:hover {
    color: var(--primary-color);
}

.theme-toggle {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: var(--transition);
}

.theme-toggle:hover {
    background-color: rgba(37, 99, 235, 0.1);
}

.theme-toggle .sun {
    display: none;
}

body.dark-theme .theme-toggle .sun {
    display: inline;
}

body.dark-theme .theme-toggle .moon {
    display: none;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-light);
    transition: var(--transition);
}

body.dark-theme .menu-toggle span {
    background-color: var(--text-dark);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 80px;
}

.hero-content {
    max-width: 800px;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    animation: fadeIn 1s ease-in;
}

.highlight {
    color: var(--primary-color);
}

body.dark-theme .highlight {
    color: var(--text-dark);
    font-weight: 700;
}

.subtitle {
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

body.dark-theme .subtitle {
    color: #999999;
}

.description {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    color: var(--secondary-color);
}

body.dark-theme .description {
    color: #999999;
}

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

.btn {
    padding: 0.75rem 2rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    display: inline-block;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--bg-light);
    border-radius: var(--border-radius);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
}

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

body.dark-theme .btn-secondary {
    color: var(--text-dark);
    border-color: var(--text-dark);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: var(--bg-light);
}

body.dark-theme .btn-secondary:hover {
    background-color: var(--text-dark);
    color: var(--bg-dark);
}

/* Sections */
section {
    padding: 5rem 0;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-light);
}

body.dark-theme .section-title {
    color: var(--text-dark);
}

/* About */
.about {
    background-color: var(--bg-light);
}

body.dark-theme .about {
    background-color: var(--bg-dark);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-text p {
    margin-bottom: 1rem;
    font-size: 1.1rem;
    line-height: 1.8;
}

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

.project-card {
    background-color: var(--card-light);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border-light);
}

body.dark-theme .project-card {
    background-color: var(--card-dark);
    border: 1px solid var(--border-dark);
}

.project-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

body.dark-theme .project-card:hover {
    box-shadow: 0 4px 12px rgba(255, 255, 255, 0.05);
}

.project-preview {
    width: 100%;
    height: 200px;
    border-radius: 0.75rem;
    overflow: hidden;
    margin-bottom: 1.5rem;
    background: linear-gradient(90deg, var(--bg-light) 25%, var(--card-light) 50%, var(--bg-light) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border: 1px solid var(--border-light);
    position: relative;
}

@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

body.dark-theme .project-preview {
    background: linear-gradient(90deg, var(--bg-dark) 25%, var(--card-dark) 50%, var(--bg-dark) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border: 1px solid var(--border-dark);
}

.project-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
    opacity: 0;
    animation: fadeInImage 0.5s ease forwards;
}

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

.project-card:hover .project-preview img {
    transform: scale(1.05);
}

.project-preview-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    background: linear-gradient(135deg, var(--bg-light) 0%, var(--card-light) 100%);
}

body.dark-theme .project-preview-placeholder {
    background: linear-gradient(135deg, var(--bg-dark) 0%, var(--card-dark) 100%);
}

.project-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.project-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

body.dark-theme .project-card h3 {
    color: var(--text-dark);
}

.project-card p {
    margin-bottom: 1rem;
    color: var(--secondary-color);
    line-height: 1.6;
}

body.dark-theme .project-card p {
    color: #999999;
}

.technologies {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tech-tag {
    background-color: var(--bg-light);
    color: var(--text-light);
    padding: 0.375rem 0.875rem;
    border-radius: 2rem;
    font-size: 0.85rem;
    font-weight: 500;
    border: 1px solid var(--border-light);
}

body.dark-theme .tech-tag {
    background-color: var(--bg-dark);
    color: var(--text-dark);
    border: 1px solid var(--border-dark);
}

.project-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    display: inline-block;
}

body.dark-theme .project-link {
    color: var(--text-dark);
}

.project-link:hover {
    text-decoration: underline;
    transform: translateX(3px);
}

/* Skills */
.skills {
    background-color: var(--bg-light);
}

body.dark-theme .skills {
    background-color: var(--bg-dark);
}

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

.skill-card {
    background-color: var(--card-light);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border-light);
}

body.dark-theme .skill-card {
    background-color: var(--card-dark);
    border: 1px solid var(--border-dark);
}

.skill-card:hover {
    transform: translateY(-3px);
}

.skill-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

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

.skill-name {
    font-size: 1.2rem;
    font-weight: 600;
}

.skill-bar {
    background-color: var(--bg-light);
    height: 0.5rem;
    border-radius: 1rem;
    overflow: hidden;
    border: 1px solid var(--border-light);
}

body.dark-theme .skill-bar {
    background-color: var(--bg-dark);
    border: 1px solid var(--border-dark);
}

.skill-progress {
    background-color: var(--primary-color);
    height: 100%;
    border-radius: 1rem;
    transition: width 1s ease;
}

body.dark-theme .skill-progress {
    background-color: #4a90e2;
}

/* Contact */
.contact-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.contact-text {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: var(--secondary-color);
}

body.dark-theme .contact-text {
    color: #999999;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact-link {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem;
    background-color: var(--card-light);
    border-radius: var(--border-radius);
    text-decoration: none;
    color: var(--text-light);
    transition: var(--transition);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-light);
}

body.dark-theme .contact-link {
    background-color: var(--card-dark);
    color: var(--text-dark);
    border: 1px solid var(--border-dark);
}

.contact-link:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

body.dark-theme .contact-link:hover {
    box-shadow: 0 4px 10px rgba(255, 255, 255, 0.05);
}

.contact-link .icon {
    font-size: 1.5rem;
}

/* Footer */
.footer {
    background-color: var(--bg-light);
    padding: 2rem 0;
    text-align: center;
    color: var(--secondary-color);
    border-top: 1px solid var(--border-light);
}

body.dark-theme .footer {
    background-color: var(--bg-dark);
    border-top: 1px solid var(--border-dark);
    color: #999999;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 1s ease-in;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background-color: var(--bg-light);
        width: 100%;
        padding: 2rem;
        box-shadow: var(--shadow);
        transition: var(--transition);
    }

    body.dark-theme .nav-menu {
        background-color: var(--card-dark);
    }

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

    .menu-toggle {
        display: flex;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1.2rem;
    }

    .section-title {
        font-size: 2rem;
    }

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

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .hero h1 {
        font-size: 1.75rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}