/* CSS Variables for Theme Support */
:root {
    /* Light Theme Colors */
    --primary-color: #2563eb;
    --primary-color-rgb: 37, 99, 235;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --accent-color: #f59e0b;
    --background-color: #ffffff;
    --surface-color: #f8fafc;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #1e40af 100%);
    --gradient-secondary: linear-gradient(135deg, #60a5fa 0%, #3b82f6 100%);
}

/* Dark Theme Colors */
[data-theme="dark"] {
    --primary-color: #3b82f6;
    --primary-color-rgb: 59, 130, 246;
    --primary-hover: #60a5fa;
    --secondary-color: #94a3b8;
    --accent-color: #fbbf24;
    --background-color: #0f172a;
    --surface-color: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    --border-color: #334155;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --gradient-primary: linear-gradient(135deg, #1e40af 0%, #1e3a8a 100%);
    --gradient-secondary: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px var(--shadow-color);
}

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

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.btn.disabled:hover {
    transform: none;
    background: var(--secondary-color);
    color: var(--text-muted);
}

/* Header and Navigation */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(15px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s ease;
}

[data-theme="dark"] .header {
    background: rgba(15, 23, 42, 0.6);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
}

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

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

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

.nav-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    position: absolute;
    right: 2rem;
}

.theme-selector {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    background: var(--surface-color);
    border-radius: 0.75rem;
    padding: 0.25rem;
    border: 1px solid var(--border-color);
}

.theme-option {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
    min-width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-option:hover {
    color: var(--primary-color);
    background: rgba(var(--primary-color-rgb, 59, 130, 246), 0.1);
}

.theme-option.active {
    background: var(--primary-color);
    color: white;
}

.language-toggle {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    padding: 0.5rem 0.75rem;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
    min-width: 40px;
    border: 1px solid var(--border-color);
}

.language-toggle:hover {
    background: var(--surface-color);
    color: var(--primary-color);
}

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

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: 0.3s;
    border-radius: 2px;
}

/* Mobile menu active state */
.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

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

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
}

/* Hero Section */
.hero {
    padding: 8rem 0 4rem;
    background: linear-gradient(135deg, #101d42 0%, #2a2f4f 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 20%, rgba(59, 130, 246, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(147, 51, 234, 0.1) 0%, transparent 50%);
    opacity: 0.8;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 1;
    padding: 0 1rem;
}

@media (min-width: 768px) {
    .hero-content {
        padding: 0 2rem;
    }
}

@media (min-width: 1024px) {
    .hero-content {
        padding: 0 3rem;
        gap: 5rem;
    }
}

@media (min-width: 1280px) {
    .hero-content {
        padding: 0 4rem;
        gap: 6rem;
    }
}

@media (min-width: 1536px) {
    .hero-content {
        padding: 0 5rem;
        gap: 7rem;
    }
}

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

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.1;
}

.hero-title .highlight {
    background: linear-gradient(45deg, #fbbf24, #f59e0b);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #fff;
    opacity: 1;
    text-shadow: 0 2px 8px rgba(30,64,175,0.15);
}

.hero-separator {
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, #3b82f6, #8b5cf6);
    border: none;
    margin: 1.5rem 0;
    opacity: 0.6;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    color: #fff;
    opacity: 0.95;
    line-height: 1.6;
    text-shadow: 0 2px 8px rgba(30,64,175,0.10);
}

.hero-availability {
    margin-bottom: 2rem;
}

.availability-text {
    font-size: 1rem;
    color: #10b981;
    font-weight: 500;
    opacity: 0.9;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 0.9;
    }
    50% {
        opacity: 1;
    }
}

.hero-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn-linkedin {
    background: linear-gradient(135deg, #0077b5 0%, #005885 100%);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 119, 181, 0.3);
}

.btn-linkedin:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 25px rgba(0, 119, 181, 0.4);
    color: white;
    text-decoration: none;
}

/* Animaciones */
.animate-fade-in {
    animation: fadeIn 1s ease-out;
}

.animate-slide-up {
    animation: slideUp 1s ease-out 0.3s both;
}

.animate-zoom-in {
    animation: zoomIn 1s ease-out 0.6s both;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

@keyframes zoomIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.profile-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    border-radius: 1.5rem;
    padding: 2.5rem;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.profile-card:hover {
    transform: scale(1.05) translateY(-5px);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.15);
}

.profile-avatar {
    width: 140px;
    height: 140px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    overflow: hidden;
    border: 4px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
}

.profile-avatar::before {
    content: '';
    position: absolute;
    top: -6px;
    left: -6px;
    right: -6px;
    bottom: -6px;
    border-radius: 50%;
    background: linear-gradient(45deg, #3b82f6, #8b5cf6, #3b82f6);
    background-size: 200% 200%;
    animation: borderGlow 3s ease-in-out infinite;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
}

.profile-avatar:hover::before {
    opacity: 1;
}

.profile-avatar:hover {
    transform: scale(1.05);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4);
}

@keyframes borderGlow {
    0%, 100% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
}

.profile-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.profile-info h3 {
    color: white;
    margin-bottom: 0.5rem;
}

.profile-info p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 1.5rem;
}

.profile-stats {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: #fbbf24;
}

.stat-label {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.8);
}

/* Section Styles */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.section-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* About Section */
.about {
    padding: 6rem 0;
    background: var(--surface-color);
}

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

.about-text p {
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 2rem;
}

.skills h3 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

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

.skill-category h4 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.skill-tag {
    background: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.9rem;
    font-weight: 500;
}

/* Experience Section */
.experience {
    padding: 6rem 0;
    background: var(--background-color);
}

.timeline-container {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem 0;
}

.timeline-line {
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, #3b82f6, #8b5cf6, #06b6d4);
    border-radius: 2px;
    z-index: 1;
}

.timeline-content {
    position: relative;
    z-index: 2;
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    padding-left: 80px;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: 15px;
    top: 2rem;
    width: 30px;
    height: 30px;
    background: var(--background-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 3;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.marker-dot {
    width: 16px;
    height: 16px;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    border-radius: 50%;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

.experience-card {
    background: var(--surface-color);
    border-radius: 1rem;
    padding: 2rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.experience-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #3b82f6, #8b5cf6, #06b6d4);
}

.experience-card:hover {
    transform: translateY(-5px) translateX(5px);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.15);
}

.experience-header {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.experience-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    flex-shrink: 0;
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.3);
    transition: all 0.3s ease;
}

.experience-card:hover .experience-icon {
    transform: scale(1.05);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.4);
}

.experience-info h3 {
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    line-height: 1.2;
}

.experience-company {
    font-weight: 600;
    color: #3b82f6;
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

.experience-period {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
    background: rgba(59, 130, 246, 0.1);
    padding: 0.25rem 0.75rem;
    border-radius: 0.5rem;
    display: inline-block;
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.experience-content p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1.5rem;
    font-size: 1rem;
}

.experience-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tech-tag {
    background: rgba(59, 130, 246, 0.1);
    color: #3b82f6;
    padding: 0.4rem 0.8rem;
    border-radius: 1rem;
    font-size: 0.85rem;
    font-weight: 500;
    border: 1px solid rgba(59, 130, 246, 0.2);
    transition: all 0.3s ease;
}

.tech-tag:hover {
    background: rgba(59, 130, 246, 0.2);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
}

/* Projects Section */
.projects {
    padding: 6rem 0;
    background: var(--surface-color);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--background-color);
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: 0 4px 20px var(--shadow-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 40px var(--shadow-color);
}

.project-image {
    height: 200px;
    background: var(--gradient-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: white;
}

.project-content {
    padding: 2rem;
}

.project-content h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.project-content p {
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.project-links {
    display: flex;
    gap: 1rem;
}

.project-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.project-link:hover {
    color: var(--primary-hover);
}

/* Education Section */
.education {
    padding: 6rem 0;
}

.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.education-card {
    background: var(--surface-color);
    border-radius: 1rem;
    padding: 2rem;
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    transition: transform 0.3s ease;
}

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

.education-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    flex-shrink: 0;
}

.education-content h3 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.education-institution {
    color: var(--primary-color);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.education-period {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

/* Certifications Section */
.certifications {
    padding: 6rem 0;
    background: var(--surface-color);
}

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

.certification-card {
    background: var(--background-color);
    border-radius: 1rem;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 4px 20px var(--shadow-color);
    transition: transform 0.3s ease;
}

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

.certification-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
    margin: 0 auto 1.5rem;
}

.certification-content h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.certification-content p {
    margin-bottom: 1rem;
    line-height: 1.6;
}

.certification-date {
    background: var(--primary-color);
    color: white;
    padding: 0.25rem 1rem;
    border-radius: 1rem;
    font-size: 0.9rem;
    font-weight: 500;
}

/* Contact Section */
.contact {
    padding: 6rem 0;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: white;
    flex-shrink: 0;
}

.contact-details h3 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.contact-details p {
    color: var(--text-secondary);
    margin: 0;
}

.contact-form {
    background: var(--surface-color);
    padding: 2rem;
    border-radius: 1rem;
    display: flex;
    justify-content: center;
    align-items: center;
}

.contact-email-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.1rem;
    padding: 1rem 2rem;
    min-width: 200px;
    justify-content: center;
    text-decoration: none;
    transition: all 0.3s ease;
}

.contact-email-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.3);
}



/* Footer */
.footer {
    background: var(--surface-color);
    padding: 3rem 0 1rem;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.footer-brand h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.footer-brand p {
    color: var(--text-secondary);
    margin: 0;
}

.footer-social {
    display: flex;
    gap: 1rem;
}

.social-link {
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: transform 0.3s ease;
}

.social-link:hover {
    transform: translateY(-2px);
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }

    .nav-menu {
        position: fixed;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--background-color);
        border-top: 1px solid var(--border-color);
        padding: 2rem;
        flex-direction: column;
        gap: 1rem;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        box-shadow: 0 4px 20px var(--shadow-color);
        z-index: 999;
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-link {
        padding: 1rem 0;
        border-bottom: 1px solid var(--border-color);
        width: 100%;
        text-align: center;
    }

    .nav-link:last-child {
        border-bottom: none;
    }

    .nav-link.active {
        color: var(--primary-color);
        font-weight: 600;
    }

    .nav-link.active::after {
        width: 100%;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .nav-controls {
        position: static;
        margin-left: auto;
    }

    .theme-selector {
        gap: 0.125rem;
        padding: 0.125rem;
    }

    .theme-option {
        min-width: 32px;
        height: 32px;
        font-size: 0.875rem;
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
        padding: 0 0.5rem;
    }

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

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

    .hero-actions {
        justify-content: center;
        flex-direction: column;
        align-items: center;
    }

    .hero-actions .btn {
        width: 100%;
        max-width: 300px;
    }

    .profile-card {
        padding: 2rem;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .contact-email-btn {
        width: 100%;
        max-width: 300px;
    }

    .footer-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

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

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

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

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

    .timeline-container {
        padding: 1rem 0;
    }

    .timeline-line {
        left: 20px;
        width: 2px;
    }

    .timeline-item {
        padding-left: 60px;
        margin-bottom: 2rem;
    }

    .timeline-marker {
        left: 10px;
        width: 24px;
        height: 24px;
    }

    .marker-dot {
        width: 12px;
        height: 12px;
    }

    .experience-card {
        padding: 1.5rem;
    }

    .experience-header {
        gap: 1rem;
    }

    .experience-icon {
        width: 50px;
        height: 50px;
        font-size: 1.25rem;
    }

    .experience-info h3 {
        font-size: 1.25rem;
    }

    .experience-tech {
        gap: 0.4rem;
    }

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

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

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

    .hero-separator {
        width: 40px;
        margin: 1rem auto;
    }

    .timeline-line {
        left: 15px;
    }

    .timeline-item {
        padding-left: 50px;
    }

    .timeline-marker {
        left: 8px;
        width: 20px;
        height: 20px;
    }

    .marker-dot {
        width: 10px;
        height: 10px;
    }

    .experience-card {
        padding: 1rem;
    }

    .experience-info h3 {
        font-size: 1.1rem;
    }

    .experience-company {
        font-size: 1rem;
    }

    .section-header h2 {
        font-size: 2rem;
    }

    .btn {
        padding: 0.6rem 1.2rem;
        font-size: 0.9rem;
    }

    .profile-card {
        padding: 1.5rem;
    }

    .profile-avatar {
        width: 120px;
        height: 120px;
    }
}

/* Animation Classes */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Smooth transitions for theme changes */
* {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}