:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #4ade80;
    --dark: #1e293b;
    --light: #f8fafc;
    --gray: #94a3b8;
    --accent: #8b5cf6;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--light);
    color: var(--dark);
    overflow-x: hidden;
}

/* Header & Navigation */
header {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
}

.nav-container {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    padding: 1rem;
    transition: all 0.3s ease;
}

.nav-scrolled {
    background-color: rgba(15, 23, 42, 0.9);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(8px);
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    color: var(--light);
    font-weight: bold;
    font-size: 1.5rem;
    text-decoration: none;
}

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

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

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

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    background-color: var(--secondary);
    bottom: -4px;
    left: 0;
    transition: width 0.3s ease;
}

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

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--light);
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    color: var(--light);
    position: relative;
    z-index: 10;
    text-align: center;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 1rem;
    background: linear-gradient(90deg, var(--secondary) 0%, var(--primary) 50%, var(--accent) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 1s ease forwards 0.3s;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 1s ease forwards 0.6s;
}

.typed-text {
    color: var(--secondary);
}

.cta-button {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--primary);
    color: white;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 1s ease forwards 0.9s;
}

.cta-button:hover {
    background-color: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.particle {
    position: absolute;
    border-radius: 50%;
    opacity: 0.5;
    animation: float 15s infinite linear;
}

@keyframes float {
    0% {
        transform: translateY(0) translateX(0) rotate(0deg);
    }
    33% {
        transform: translateY(-50px) translateX(50px) rotate(120deg);
    }
    66% {
        transform: translateY(50px) translateX(-30px) rotate(240deg);
    }
    100% {
        transform: translateY(0) translateX(0) rotate(360deg);
    }
}

@keyframes fadeUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Section Styles */
section {
    padding: 5rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

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

.section-title::after {
    content: '';
    position: absolute;
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, var(--secondary), var(--primary));
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 2px;
}

/* About Section */
.about-container {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    align-items: center;
}

.about-image {
    position: relative;
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.about-image-placeholder {
    width: 100%;
    height: 400px;
    background: linear-gradient(135deg, #4ade80 0%, #2563eb 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 4rem;
    color: white;
    font-weight: bold;
}

.about-content {
    opacity: 0;
    transform: translateX(20px);
    transition: all 0.6s ease;
    color: black;
}

.about-content.visible {
    opacity: 1;
    transform: translateX(0);
}

.about-text {
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.about-contact {
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid #e2e8f0;
}

.about-contact p {
    margin-bottom: 0.5rem;
}

.about-contact a {
    color: var(--primary);
    text-decoration: none;
}

.about-contact a:hover {
    text-decoration: underline;
}

/* Skills Section */
.skills-container {
    margin-top: 3rem;
}

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

.skill-category {
    background-color: white;
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    opacity: 0;
    transform: translateY(20px);
}

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

.skill-category:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.skill-category h3 {
    margin-bottom: 1.5rem;
    color: var(--primary);
    position: relative;
    display: inline-block;
}

.skill-category h3::after {
    content: '';
    position: absolute;
    width: 50%;
    height: 3px;
    background-color: var(--secondary);
    bottom: -5px;
    left: 0;
}

.skill-list {
    list-style: none;
}

.skill-item {
    margin-bottom: 1rem;
    position: relative;
}

.skill-name {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.25rem;
}

.skill-level {
    font-size: 0.85rem;
    color: var(--primary);
}

.progress-wrapper {
    background-color: #e2e8f0;
    height: 8px;
    border-radius: 4px;
    margin-top: 4px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    border-radius: 4px;
    background: linear-gradient(90deg, var(--secondary) 0%, var(--primary) 100%);
    width: 0;
    transition: width 1.5s ease-in-out;
}

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

.project-card {
    background-color: white;
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    opacity: 0;
    transform: translateY(20px);
}

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

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.project-img {
    width: 100%;
    height: 200px;
    background-size: cover;
    background-position: center;
    position: relative;
    overflow: hidden;
}

.project-img::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0) 100%);
}

.project-content {
    padding: 1.5rem;
}

.project-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--dark);
}

.project-description {
    color: var(--gray);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.project-btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: var(--primary);
    color: white;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.project-btn:hover {
    background-color: var(--primary-dark);
}

/* Education Section */
.education-timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 0;
}

.education-timeline::before {
    content: '';
    position: absolute;
    width: 4px;
    background-color: var(--gray);
    top: 0;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.timeline-item:nth-child(odd) {
    padding-right: calc(50% + 2rem);
}

.timeline-item:nth-child(even) {
    padding-left: calc(50% + 2rem);
}

.timeline-dot {
    position: absolute;
    width: 20px;
    height: 20px;
    background-color: var(--primary);
    border-radius: 50%;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
}

.timeline-content {
    background-color: white;
    padding: 1.5rem;
    border-radius: 1rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.timeline-year {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--primary);
    color: white;
    border-radius: 1rem;
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.timeline-school {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--dark);
}

.timeline-location {
    color: var(--gray);
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.timeline-score {
    font-weight: bold;
    color: var(--primary);
}

/* Certifications Section */
.certifications-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

.certification-card {
    background-color: white;
    border-radius: 1rem;
    padding: 1.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.certification-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.certification-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.certification-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--dark);
}

.certification-issuer {
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 1rem;
    display: inline-block;
    position: relative;
}

.certification-issuer::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background-color: var(--secondary);
    bottom: -5px;
    left: 0;
}

.certification-description {
    color: var(--gray);
    line-height: 1.6;
}

/* Contact Section */
.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-top: 2rem;
}

.contact-info {
    background-color: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.contact-title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary);
}

.contact-text {
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

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

.contact-icon {
    margin-right: 1rem;
    font-size: 1.25rem;
}

.contact-form {
    background-color: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--dark);
    font-weight: 500;
}

.form-input, .form-textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #e2e8f0;
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

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

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

.form-submit {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
}

.form-submit:hover {
    background-color: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

/* Footer */
footer {
    background-color: var(--dark);
    color: var(--light);
    padding: 3rem 2rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

.footer-link {
    color: var(--light);
    text-decoration: none;
    position: relative;
    transition: color 0.3s ease;
}

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

.footer-copyright {
    color: var(--gray);
    font-size: 0.875rem;
}

/* Media Queries */
@media (max-width: 992px) {
    .hero-title {
        font-size: 3.5rem;
    }
    
    .about-container {
        grid-template-columns: 1fr;
    }
    
    .contact-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .nav-links {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: rgba(15, 23, 42, 0.95);
        padding: 1rem;
        gap: 1rem;
        backdrop-filter: blur(8px);
        border-radius: 0 0 1rem 1rem;
    }
    
    .timeline-item:nth-child(odd),
    .timeline-item:nth-child(even) {
        padding-left: 2rem;
        padding-right: 0;
    }
    
    .education-timeline::before {
        left: 0;
        transform: none;
    }
    
    .timeline-dot {
        left: 0;
        transform: none;
    }
}

@media (max-width: 576px) {
    section {
        padding: 3rem 1rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
}

/* Animation Delays for Staggered Elements */
.skill-category:nth-child(1) {
    transition-delay: 0.1s;
}

.skill-category:nth-child(2) {
    transition-delay: 0.2s;
}

.skill-category:nth-child(3) {
    transition-delay: 0.3s;
}

.project-card:nth-child(1) {
    transition-delay: 0.1s;
}

.project-card:nth-child(2) {
    transition-delay: 0.2s;
}

.project-card:nth-child(3) {
    transition-delay: 0.3s;
}

.timeline-item:nth-child(1) {
    transition-delay: 0.1s;
}

.timeline-item:nth-child(2) {
    transition-delay: 0.2s;
}

.timeline-item:nth-child(3) {
    transition-delay: 0.3s;
}

.certification-card:nth-child(1) {
    transition-delay: 0.1s;
}

.certification-card:nth-child(2) {
    transition-delay: 0.2s;
}

/* Additional JS support classes */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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