:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --accent-color: #3b82f6;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #ffffff;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-dark: #1e293b;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.background {
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    position: relative;
}

.stars, .twinkling {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 100%;
    display: block;
    z-index: 1;
    pointer-events: none;
}

.stars {
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="0.5" fill="rgba(255,255,255,0.6)"/><circle cx="80" cy="30" r="0.3" fill="rgba(255,255,255,0.4)"/><circle cx="40" cy="70" r="0.4" fill="rgba(255,255,255,0.5)"/><circle cx="90" cy="80" r="0.2" fill="rgba(255,255,255,0.3)"/><circle cx="10" cy="90" r="0.3" fill="rgba(255,255,255,0.4)"/></svg>') repeat;
    animation: sparkle 20s linear infinite;
}

.twinkling {
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="30" cy="40" r="0.2" fill="rgba(255,255,255,0.8)"/><circle cx="70" cy="60" r="0.1" fill="rgba(255,255,255,0.6)"/><circle cx="15" cy="75" r="0.15" fill="rgba(255,255,255,0.7)"/></svg>') repeat;
    animation: sparkle 15s linear infinite reverse;
}

@keyframes sparkle {
    0% { transform: translateY(0px); }
    100% { transform: translateY(-1000px); }
}

.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

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

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

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

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

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: var(--transition);
}

.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 100px 2rem 0;
    position: relative;
    z-index: 2;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.greeting {
    font-size: 1.5rem;
    color: rgba(255, 255, 255, 0.9);
    display: block;
    margin-bottom: 0.5rem;
}

.name-highlight {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--text-light);
    display: block;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, #fff, #f0f9ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 1rem;
}

.hero-description {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 2rem;
    line-height: 1.6;
}

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

.btn {
    padding: 12px 24px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    border: 2px solid transparent;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    background: transparent;
    color: var(--text-light);
    border-color: var(--text-light);
}

.btn-secondary {
    background: transparent;
    color: var(--text-light);
    border-color: var(--text-light);
}

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

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

.hero-image .image-container {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid rgba(255, 255, 255, 0.3);
    box-shadow: var(--shadow-xl);
    transition: var(--transition);
}

.hero-image .image-container:hover {
    transform: scale(1.05);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.2);
}

.profile_picture {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.about-section {
    padding: 100px 0;
    background: var(--bg-secondary);
    position: relative;
    z-index: 2;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 3rem;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--primary-color);
    border-radius: 2px;
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-intro {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.8;
}

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

.highlight-item {
    text-align: center;
    padding: 1.5rem;
    background: var(--bg-primary);
    border-radius: 10px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.highlight-item i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.highlight-item h3 {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

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

.about-stats {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.stat-item {
    text-align: center;
    padding: 2rem;
    background: var(--bg-primary);
    border-radius: 10px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.stat-item:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

.stat-number {
    display: block;
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

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

.experience_section {
    padding: 100px 0;
    background: var(--bg-primary);
    position: relative;
    z-index: 2;
}

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

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

.timeline-item {
    position: relative;
    margin-bottom: 50px;
    width: 50%;
    padding: 0 40px;
    opacity: 0;
    transform: translateY(50px);
    transition: var(--transition);
}

.timeline-item.animate {
    opacity: 1;
    transform: translateY(0);
}

.timeline-item:nth-child(odd) {
    left: 0;
    text-align: right;
}

.timeline-item:nth-child(even) {
    left: 50%;
    text-align: left;
}

.timeline-item::before {
    content: '';
    position: absolute;
    top: 20px;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    box-shadow: 0 0 0 4px var(--bg-primary);
}

.timeline-item:nth-child(odd)::before {
    right: -10px;
}

.timeline-item:nth-child(even)::before {
    left: -10px;
}

.timeline-date {
    font-size: 0.9rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.timeline-content {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.timeline-content h3 {
    color: var(--text-primary);
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.timeline-content h4 {
    color: var(--primary-color);
    font-size: 1rem;
    margin-bottom: 1rem;
}

.timeline-content ul {
    list-style: none;
    padding-left: 0;
}

.timeline-content li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.timeline-content li::before {
    content: '▶';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-size: 0.8rem;
}

.projects_section {
    padding: 100px 0;
    background: var(--bg-secondary);
    position: relative;
    z-index: 2;
}

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

.project-card {
    background: var(--bg-primary);
    border-radius: 15px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    opacity: 0;
    transform: translateY(50px);
    border: 1px solid var(--border-color);
}

.project-card.animate {
    opacity: 1;
    transform: translateY(0);
}

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

.project-image {
    text-align: center;
    margin-bottom: 1.5rem;
}

.project-image i {
    font-size: 3rem;
    color: var(--primary-color);
    padding: 1rem;
    background: rgba(37, 99, 235, 0.1);
    border-radius: 50%;
}

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

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

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

.tech-tag {
    background: var(--primary-color);
    color: var(--text-light);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.project-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

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

.skills_section {
    padding: 100px 0;
    background: var(--bg-primary);
    position: relative;
    z-index: 2;
}

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

.skill-category {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    opacity: 0;
    transform: translateY(50px);
}

.skill-category.animate {
    opacity: 1;
    transform: translateY(0);
}

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

.skill-category h3 {
    color: var(--text-primary);
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.skill-category i {
    color: var(--primary-color);
}

.skills-grid {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.skill-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.skill-name {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.9rem;
}

.skill-bar {
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 4px;
    transition: width 1s ease-out;
}

.certifications-section {
    padding: 100px 0;
    background: var(--bg-secondary);
    position: relative;
    z-index: 2;
}

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

.cert-card {
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border-color);
    opacity: 0;
    transform: translateY(50px);
}

.cert-card.animate {
    opacity: 1;
    transform: translateY(0);
}

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

.cert-icon {
    margin-bottom: 1rem;
}

.cert-icon i {
    font-size: 3rem;
    color: var(--primary-color);
}

.cert-card h3 {
    color: var(--text-primary);
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.cert-card p {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 1rem;
}

.cert-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Contact Section */
.contact_section {
    padding: 100px 0;
    background: var(--bg-primary);
    position: relative;
    z-index: 2;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.contact-info h3 {
    color: var(--text-primary);
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

.contact-info p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 2rem;
    line-height: 1.6;
}

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

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--text-secondary);
}

.contact-item i {
    color: var(--primary-color);
    font-size: 1.2rem;
    width: 20px;
}

.contact_form {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow-md);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form_group {
    margin-bottom: 1.5rem;
}

.form_group label {
    display: block;
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.form_group input,
.form_group textarea,
.form_group select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
    background: var(--bg-primary);
}

.form_group input:focus,
.form_group textarea:focus,
.form_group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form_group textarea {
    resize: vertical;
    min-height: 120px;
}

.submit_button {
    width: 100%;
    padding: 14px 24px;
    background: var(--primary-color);
    color: var(--text-light);
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.submit_button:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Footer */
footer {
    background: var(--bg-dark);
    color: var(--text-light);
    padding: 3rem 0 1rem;
    position: relative;
    z-index: 2;
}

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

.footer-left h3 {
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.footer-left p {
    color: rgba(255, 255, 255, 0.7);
}

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

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-light);
    border-radius: 50%;
    transition: var(--transition);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.7);
}

@media screen and (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--bg-primary);
        width: 100%;
        text-align: center;
        transition: var(--transition);
        box-shadow: var(--shadow-lg);
        padding: 2rem 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu li {
        margin: 1rem 0;
    }
    
    .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);
    }
    
    .hero-section {
        flex-direction: column;
        text-align: center;
        padding: 120px 1rem 2rem;
    }
    
    .hero-content {
        margin-bottom: 2rem;
    }
    
    .name-highlight {
        font-size: 2.5rem;
    }
    
    .hero-image .image-container {
        width: 250px;
        height: 250px;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .about-highlights {
        grid-template-columns: 1fr;
    }
    
    .timeline::before {
        left: 20px;
    }
    
    .timeline-item {
        width: 100%;
        padding-left: 50px;
        text-align: left;
        left: 0 !important;
    }
    
    .timeline-item::before {
        left: 10px !important;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .skills-categories {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .container {
        padding: 0 1rem;
    }
}

@media screen and (max-width: 480px) {
    .name-highlight {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero-image .image-container {
        width: 200px;
        height: 200px;
    }
}