:root {
    /* Color Palette (Dark Theme Default) */
    --bg-color: #050505;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    
    --accent-1: #00f0ff;
    --accent-2: #8a2be2;
    --accent-gradient: linear-gradient(90deg, var(--accent-1), var(--accent-2));
    
    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    
    /* Typography */
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
    
    /* Spacing & Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

:root[data-theme="light"] {
    --bg-color: #f8f9fa;
    --text-primary: #111111;
    --text-secondary: #555555;
    
    --accent-1: #007bff;
    --accent-2: #6f42c1;
    --accent-gradient: linear-gradient(90deg, var(--accent-1), var(--accent-2));
    
    --glass-bg: rgba(0, 0, 0, 0.03);
    --glass-border: rgba(0, 0, 0, 0.1);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.5s ease, color 0.5s ease;
}

/* Background Decorations */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 50% 50%, rgba(138, 43, 226, 0.05) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(0, 240, 255, 0.05) 0%, transparent 40%);
    z-index: -1;
    pointer-events: none;
}

:root[data-theme="light"] body::before {
    background: radial-gradient(circle at 50% 50%, rgba(111, 66, 193, 0.05) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(0, 123, 255, 0.05) 0%, transparent 40%);
}

h1, h2, h3, h4 {
    font-family: var(--font-heading);
    line-height: 1.2;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

.section {
    padding: 100px 5%;
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
}

.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Glass Card Reusable Class */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 2rem;
    transition: var(--transition);
}

.glass-card:hover {
    transform: translateY(-5px);
    border-color: rgba(0, 240, 255, 0.3);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(5, 5, 5, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
    transition: var(--transition);
}

:root[data-theme="light"] .navbar {
    background: rgba(248, 249, 250, 0.8);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: -1px;
}

.logo span {
    color: var(--accent-1);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-secondary);
    transition: var(--transition);
    position: relative;
}

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

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

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.btn-contact {
    background: var(--accent-gradient);
    padding: 0.6rem 1.5rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.95rem;
    color: white; /* Always white text on the gradient */
    transition: var(--transition);
}

.btn-contact:hover {
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(138, 43, 226, 0.4);
}

.lang-btn, .icon-btn {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    padding: 0.4rem 0.8rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-btn {
    font-size: 1.2rem;
    padding: 0.3rem 0.6rem;
}

.lang-btn:hover, .icon-btn:hover {
    border-color: var(--accent-1);
    color: var(--accent-1);
}

.hamburger {
    display: none;
    cursor: pointer;
}

.bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    transition: var(--transition);
    background-color: var(--text-primary);
}

/* Hero Section */
.hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 100vh;
    padding-top: 120px;
    gap: 4rem;
}

.hero-content {
    flex: 1;
}

.greeting {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.name {
    font-size: 4.5rem;
    margin-bottom: 1rem;
    letter-spacing: -2px;
}

.role {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
    min-height: 40px; /* Previene saltos en el typing effect */
}

.cursor {
    display: inline-block;
    width: 3px;
    background-color: var(--text-primary);
    margin-left: 5px;
    animation: blink 1s step-end infinite;
}

@keyframes blink {
    50% { opacity: 0; }
}

.hero-content .description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 500px;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.btn-primary {
    background: var(--accent-gradient);
    padding: 0.8rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    color: white; /* Always white text on primary button */
    transition: var(--transition);
    display: inline-block;
}

.btn-primary:hover {
    box-shadow: 0 0 20px rgba(0, 240, 255, 0.4);
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    border: 2px solid var(--accent-1);
    padding: 0.8rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    color: var(--accent-1);
    transition: var(--transition);
    display: inline-block;
}

.btn-secondary:hover {
    background: rgba(0, 240, 255, 0.1);
    transform: translateY(-2px);
}

/* Social Links */
.social-links-hero {
    display: flex;
    gap: 1.5rem;
}

.social-icon {
    color: var(--text-secondary);
    transition: var(--transition);
}

.social-icon:hover {
    color: var(--accent-1);
    transform: translateY(-3px) scale(1.1);
}

.hero-image-container {
    position: relative;
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.glow-circle {
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--accent-2) 0%, transparent 70%);
    opacity: 0.3;
    border-radius: 50%;
    filter: blur(50px);
    z-index: -1;
    animation: pulse 4s infinite alternate;
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 0.2; }
    100% { transform: scale(1.2); opacity: 0.4; }
}

.profile-img {
    width: 350px;
    height: 350px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--glass-border);
    box-shadow: 0 0 40px rgba(0, 0, 0, 0.5);
}

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

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

.personal-info {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.info-item {
    font-size: 1rem;
}

.info-item span {
    font-weight: 600;
    color: var(--accent-1);
    margin-right: 0.5rem;
}

.about-tech h3 {
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
}

.tag {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

.tag:hover {
    border-color: var(--accent-2);
    color: var(--text-primary);
    transform: translateY(-2px);
}

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

.project-card {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
}

.project-header h3 {
    font-size: 1.4rem;
    color: var(--text-primary);
}

.project-header .date {
    font-size: 0.8rem;
    color: var(--accent-1);
    background: rgba(0, 240, 255, 0.1);
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
}

.project-type {
    font-size: 0.9rem;
    color: var(--accent-2);
    font-weight: 600;
    margin-bottom: 1rem;
}

.project-desc {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.tech-tags.small .tag {
    padding: 0.3rem 0.6rem;
    font-size: 0.8rem;
}

/* Education Section */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    height: 100%;
    width: 2px;
    background: var(--glass-border);
}

.timeline-item {
    position: relative;
    margin-bottom: 2rem;
    margin-left: 50px;
}

.timeline-dot {
    position: absolute;
    left: -41px;
    top: 20px;
    width: 14px;
    height: 14px;
    background: var(--accent-1);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--accent-1);
}

.timeline-date {
    font-size: 0.9rem;
    color: var(--accent-1);
    margin-bottom: 0.5rem;
}

.timeline-item h3 {
    font-size: 1.3rem;
    margin-bottom: 0.3rem;
}

.timeline-item h4 {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.timeline-item p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.skill-item {
    padding: 1.5rem;
}

.skill-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.8rem;
}

.skill-info h4 {
    font-size: 1.1rem;
    font-weight: 500;
}

.skill-info span {
    font-size: 0.9rem;
    color: var(--accent-1);
}

.skill-bar {
    width: 100%;
    height: 8px;
    background: var(--glass-bg);
    border-radius: 4px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: 4px;
    transition: width 1s ease-in-out;
}

/* Footer / Contact */
.footer {
    padding-bottom: 50px;
}

.footer-content {
    padding: 4rem 2rem;
}

.footer-content > p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 3rem;
    text-align: center;
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

/* Contact Form */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-input {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 1rem;
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--accent-1);
    background: rgba(0, 240, 255, 0.05);
}

:root[data-theme="light"] .form-input:focus {
    background: rgba(0, 123, 255, 0.05);
}

.form-submit {
    border: none;
    cursor: pointer;
    font-family: var(--font-body);
    font-size: 1rem;
    align-self: flex-start;
}

.contact-links-vertical {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    justify-content: center;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    color: var(--text-primary);
    font-size: 1.1rem;
    transition: var(--transition);
}

.contact-item:hover {
    color: var(--accent-1);
    transform: translateY(-2px);
}

.contact-item svg {
    color: var(--accent-2);
}

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

/* Responsive Design */
@media (max-width: 992px) {
    .hero {
        flex-direction: column-reverse;
        text-align: center;
        padding-top: 150px;
    }
    
    .hero-content .description {
        margin: 0 auto 2.5rem;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .social-links-hero {
        justify-content: center;
    }
    
    .name {
        font-size: 3.5rem;
    }
    
    .profile-img {
        width: 250px;
        height: 250px;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links, .btn-contact {
        display: none;
    }
    
    .hamburger {
        display: block;
    }
    
    /* Mobile Menu Styles */
    .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: rgba(5, 5, 5, 0.95);
        backdrop-filter: blur(10px);
        padding: 2rem 0;
        text-align: center;
        border-bottom: 1px solid var(--glass-border);
    }
    
    :root[data-theme="light"] .nav-links.active {
        background: rgba(248, 249, 250, 0.95);
    }
    
    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    
    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .name {
        font-size: 2.8rem;
    }
    
    .role {
        font-size: 1.5rem;
        min-height: 50px;
    }
    
    .section {
        padding: 60px 5%;
    }
}