/* CSS Variables */
:root {
    /* Light Theme */
    --primary-color: #2563eb;
    --secondary-color: #3b82f6;
    --background-color: #ffffff;
    --surface-color: #f3f4f6;
    --text-primary: #1f2937;
    --text-secondary: #4b5563;
    --border-color: #e5e7eb;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --primary-color: #3b82f6;
    --secondary-color: #60a5fa;
    --background-color: #111827;
    --surface-color: #1f2937;
    --text-primary: #f3f4f6;
    --text-secondary: #d1d5db;
    --border-color: #374151;
    --shadow-color: rgba(0, 0, 0, 0.3);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-color);
    transition: background-color 0.3s, color 0.3s;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
}

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background-color: var(--background-color);
    box-shadow: 0 2px 10px var(--shadow-color);
    z-index: 1000;
    transition: background-color 0.3s;
}

.nav-brand {
    font-family: 'Poppins', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

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

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

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

.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    color: var(--text-primary);
    transition: transform 0.3s;
}

.theme-toggle:hover {
    transform: rotate(30deg);
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

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

.hero-content {
    text-align: center;
    z-index: 1;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

.hero-title .greeting {
    display: block;
    font-size: 1.5rem;
    color: var(--text-secondary);
}

.hero-title .name {
    color: var(--primary-color);
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    color: var(--text-secondary);
}

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

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 500;
    text-decoration: none;
    transition: transform 0.3s, box-shadow 0.3s;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-color);
}

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

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

/* About Section */
.about {
    padding: 6rem 0;
}

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

.about-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    align-items: center;
}

.about-image img {
    width: 100%;
    border-radius: 1rem;
    box-shadow: 0 4px 20px var(--shadow-color);
}

.about-text p {
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
}

.quick-info {
    display: grid;
    gap: 1rem;
}

.info-item {
    display: flex;
    gap: 1rem;
}

.info-label {
    font-weight: 500;
    color: var(--text-primary);
}

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

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

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 2rem;
}

.skill-card {
    background-color: var(--background-color);
    padding: 1.5rem;
    border-radius: 1rem;
    text-align: center;
    box-shadow: 0 4px 12px var(--shadow-color);
    transition: transform 0.3s;
}

.skill-card:hover {
    transform: translateY(-5px);
}

.skill-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.skill-name {
    font-weight: 500;
}

/* Projects Section */
.projects {
    padding: 6rem 0;
}

.project-filters {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.filter-btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 0.5rem;
    background-color: var(--surface-color);
    color: var(--text-primary);
    cursor: pointer;
    transition: background-color 0.3s;
}

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

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

.project-card {
    background-color: var(--surface-color);
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: 0 4px 12px var(--shadow-color);
    transition: transform 0.3s;
}

.project-card:hover {
    transform: translateY(-5px);
}

.project-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.project-content {
    padding: 1.5rem;
}

.project-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.project-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

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

.tech-tag {
    padding: 0.25rem 0.75rem;
    background-color: var(--background-color);
    border-radius: 1rem;
    font-size: 0.875rem;
}

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

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

.contact-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
}

.contact-form {
    display: grid;
    gap: 1.5rem;
}

.form-group {
    display: grid;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    padding: 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    background-color: var(--background-color);
    color: var(--text-primary);
}

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

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.social-link {
    font-size: 1.5rem;
    color: var(--text-primary);
    transition: color 0.3s;
}

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

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

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

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

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

.fade-in {
    animation: fadeIn 0.5s ease-out forwards;
}

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

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 0;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background-color: var(--primary-color);
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    width: 100%;
}

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

.timeline-content {
    position: relative;
    padding: 1.5rem;
    background-color: var(--background-color);
    border-radius: 1rem;
    box-shadow: 0 4px 12px var(--shadow-color);
    width: calc(50% - 2rem);
    margin-left: auto;
    transition: transform 0.3s ease;
}

.timeline-item:nth-child(odd) .timeline-content {
    margin-left: 0;
    margin-right: auto;
}

.timeline-content::before {
    content: '';
    position: absolute;
    top: 50%;
    width: 1rem;
    height: 1rem;
    background-color: var(--primary-color);
    border-radius: 50%;
    transform: translateY(-50%);
}

.timeline-item:nth-child(odd) .timeline-content::before {
    right: -2.5rem;
}

.timeline-item:nth-child(even) .timeline-content::before {
    left: -2.5rem;
}

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

.timeline-description {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.timeline-date {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--surface-color);
    border-radius: 1rem;
    font-size: 0.875rem;
    font-weight: 500;
}

@media (max-width: 768px) {
    .timeline::before {
        left: 1rem;
    }
    
    .timeline-content {
        width: calc(100% - 3rem);
        margin-left: 3rem !important;
    }
    
    .timeline-content::before {
        left: -2.5rem !important;
    }
}

/* Certificate Preview Styles */
.certificate-preview {
    position: relative;
    width: 100%;
    height: 150px;
    margin-top: 1rem;
    border-radius: 0.5rem;
    overflow: hidden;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
}

.timeline-content:hover .certificate-preview {
    opacity: 1;
    transform: translateY(0);
}

.certificate-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.certificate-preview:hover .certificate-image {
    transform: scale(1.1);
}

/* Update timeline content to accommodate certificate */
.timeline-content {
    position: relative;
    padding: 1.5rem;
    background-color: var(--background-color);
    border-radius: 1rem;
    box-shadow: 0 4px 12px var(--shadow-color);
    width: calc(50% - 2rem);
    margin-left: auto;
    transition: transform 0.3s ease;
}

.timeline-content:hover {
    transform: translateY(-5px);
}