/* Reset and 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: #333;
    background-color: #fff;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Dark Theme Styles */
.dark-theme {
    background-color: #1a1a1a;
    color: #e0e0e0;
}

.dark-theme .navbar {
    background: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(10px);
}

.dark-theme .nav-logo a {
    color: #e0e0e0;
}

.dark-theme .nav-link {
    color: #e0e0e0;
}

.dark-theme .nav-link:hover {
    color: #667eea;
}

.dark-theme .hamburger .bar {
    background: #e0e0e0;
}

.dark-theme .hero {
    background: linear-gradient(135deg, #2a2a2a 0%, #1a1a1a 100%);
}

.dark-theme .hero-title {
    color: #e0e0e0;
}

.dark-theme .hero-subtitle {
    color: #b0b0b0;
}

.dark-theme .hero-description {
    color: #b0b0b0;
}

.dark-theme .section-title {
    color: #e0e0e0;
}

.dark-theme p {
    color: #b0b0b0;
}

.dark-theme .about {
    background: #1a1a1a;
}

.dark-theme .stat {
    background: #2a2a2a;
    border-color: #333;
}

.dark-theme .stat h3 {
    color: #667eea;
}

.dark-theme .stat p {
    color: #b0b0b0;
}

.dark-theme .experience {
    background: #2a2a2a;
}

.dark-theme .timeline-content {
    background: #1a1a1a;
    border-color: #333;
}

.dark-theme .timeline-content h3 {
    color: #e0e0e0;
}

.dark-theme .timeline-content h4 {
    color: #667eea;
}

.dark-theme .timeline-content li {
    color: #b0b0b0;
}

.dark-theme .projects {
    background: #1a1a1a;
}

.dark-theme .project-card {
    background: #1a1a1a;
    border-color: #333;
}

.dark-theme .project-content h3 {
    color: #e0e0e0;
}

.dark-theme .tech-tag {
    background: #2a2a2a;
    color: #667eea;
    border-color: #333;
}

.dark-theme .education {
    background: #2a2a2a;
}

.dark-theme .education-item {
    background: #1a1a1a;
    border-color: #333;
}

.dark-theme .education-header h3 {
    color: #e0e0e0;
}

.dark-theme .education-date {
    color: #667eea;
}

.dark-theme .skills {
    background: #1a1a1a;
}

.dark-theme .skills-category h3 {
    color: #e0e0e0;
}

.dark-theme .skill-item {
    background: #2a2a2a;
    border-color: #333;
}

.dark-theme .skill-item:hover {
    background: #1a1a1a;
}

.dark-theme .skill-item span {
    color: #e0e0e0;
}

.dark-theme .contact {
    background: #2a2a2a;
}

.dark-theme .contact-info h3 {
    color: #e0e0e0;
}

.dark-theme .contact-method {
    color: #b0b0b0;
}

.dark-theme .contact-form {
    background: #1a1a1a;
    border-color: #333;
}

.dark-theme .form-group input,
.dark-theme .form-group textarea {
    background: #2a2a2a;
    border-color: #333;
    color: #e0e0e0;
}

.dark-theme .form-group input:focus,
.dark-theme .form-group textarea:focus {
    border-color: #667eea;
}

.dark-theme .form-group input::placeholder,
.dark-theme .form-group textarea::placeholder {
    color: #666;
}

.dark-theme .footer {
    background: #0a0a0a;
}

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

/* 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: 1.5rem;
}

p {
    margin-bottom: 1rem;
    color: #666;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

.btn-secondary {
    background: transparent;
    color: #667eea;
    border: 2px solid #667eea;
}

.btn-secondary:hover {
    background: #667eea;
    color: white;
    transform: translateY(-2px);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 0.5rem 0;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 50px;
}

.nav-logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: #333;
    text-decoration: none;
}

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

.nav-link {
    color: #333;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
    display: flex;
    align-items: center;
    height: 100%;
}

.nav-link:hover {
    color: #667eea;
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background: #667eea;
    transition: width 0.3s ease;
}

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

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

.bar {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0;
    transition: 0.3s;
}

/* Theme Toggle Button */
.theme-toggle {
    background: none;
    border: none;
    color: #333;
    font-size: 1.1rem;
    cursor: pointer;
    padding: 0.4rem;
    border-radius: 50%;
    transition: all 0.3s ease;
    margin-left: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 36px;
    width: 36px;
}

.theme-toggle:hover {
    background: rgba(102, 126, 234, 0.1);
    color: #667eea;
}

.dark-theme .theme-toggle {
    color: #e0e0e0;
}

.dark-theme .theme-toggle:hover {
    background: rgba(102, 126, 234, 0.2);
    color: #667eea;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    padding-top: 80px;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    color: #333;
}

.highlight {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: #666;
    margin-bottom: 1.5rem;
    font-weight: 400;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    color: #666;
}

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

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

.profile-image {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 20px 40px rgba(102, 126, 234, 0.3);
    overflow: hidden;
}

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

/* Section Styles */
section {
    padding: 5rem 0;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
    color: #333;
}

/* About Section */
.about {
    background: #fff;
}

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

.about-text p {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
}

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

.stat {
    text-align: center;
    padding: 1.5rem;
    background: #f8f9fa;
    border-radius: 12px;
    border: 1px solid #e9ecef;
}

.stat h3 {
    font-size: 2.5rem;
    color: #667eea;
    margin-bottom: 0.5rem;
}

.stat p {
    color: #666;
    margin: 0;
}

/* Experience Section */
.experience {
    background: #f8f9fa;
}

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

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: #667eea;
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    width: 50%;
}

.timeline-item:nth-child(odd) {
    left: 0;
    padding-right: 2rem;
}

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

.timeline-marker {
    position: absolute;
    width: 20px;
    height: 20px;
    background: #667eea;
    border-radius: 50%;
    top: 0;
    border: 4px solid #fff;
    box-shadow: 0 0 0 4px #667eea;
}

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

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

.timeline-content {
    background: #fff;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    border: 1px solid #e9ecef;
}

.timeline-content h3 {
    color: #333;
    margin-bottom: 0.5rem;
}

.timeline-content h4 {
    color: #667eea;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.timeline-date {
    color: #666;
    font-size: 0.9rem;
    font-weight: 500;
}

.timeline-content ul {
    margin-top: 1rem;
    padding-left: 1.5rem;
}

.timeline-content li {
    margin-bottom: 0.5rem;
    color: #666;
}

/* Projects Section */
.projects {
    background: #fff;
}

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

.project-card {
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid #e9ecef;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.project-image {
    height: 200px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-image i {
    font-size: 3rem;
    color: white;
}

.project-content {
    padding: 1.5rem;
}

.project-content h3 {
    color: #333;
    margin-bottom: 1rem;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 1rem 0;
}

.tech-tag {
    background: #f8f9fa;
    color: #667eea;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid #e9ecef;
}

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

.project-link {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.project-link:hover {
    color: #764ba2;
}

/* Education Section */
.education {
    background: #f8f9fa;
}

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

.education-item {
    background: #fff;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    border: 1px solid #e9ecef;
}

.education-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
    gap: 2rem;
}

.education-header h3 {
    flex: 1;
    margin-bottom: 0;
    line-height: 1.3;
}

.education-date {
    color: #667eea;
    font-weight: 500;
    white-space: nowrap;
    flex-shrink: 0;
    margin-top: 0.2rem;
}

.education-details {
    margin-top: 1.5rem;
}

.gpa {
    margin-bottom: 1rem;
    color: #666;
}

.relevant-courses ul {
    margin-top: 0.5rem;
    padding-left: 1.5rem;
}

.relevant-courses li {
    margin-bottom: 0.25rem;
    color: #666;
}

/* Skills Section */
.skills {
    background: #fff;
}

.skills-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
}

.skills-category h3 {
    color: #333;
    margin-bottom: 1.5rem;
    text-align: center;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
}

.skill-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1rem;
    background: #f8f9fa;
    border-radius: 12px;
    transition: transform 0.3s ease;
    border: 1px solid #e9ecef;
}

.skill-item:hover {
    transform: translateY(-3px);
    background: #fff;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.skill-item i {
    font-size: 2rem;
    color: #667eea;
    margin-bottom: 0.5rem;
}

.skill-item span {
    font-weight: 500;
    color: #333;
    text-align: center;
}

/* Contact Section */
.contact {
    background: #f8f9fa;
}

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

.contact-info h3 {
    color: #333;
    margin-bottom: 1rem;
}

.contact-methods {
    margin: 2rem 0;
}

.contact-method {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
    color: #666;
}

.contact-method i {
    color: #667eea;
    margin-right: 1rem;
    width: 20px;
}

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

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: #667eea;
    color: white;
    border-radius: 50%;
    text-decoration: none;
    transition: transform 0.3s ease, background 0.3s ease;
}

.social-link:hover {
    transform: translateY(-3px);
    background: #764ba2;
}

.contact-form {
    background: #fff;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    border: 1px solid #e9ecef;
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
}

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

/* Footer */
.footer {
    background: #333;
    color: #fff;
    text-align: center;
    padding: 2rem 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: #fff;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu a {
        padding: 1rem;
        display: block;
    }

    .theme-toggle {
        margin-left: 0;
        margin-top: 1rem;
    }

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }

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

    .hero-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }

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

    .about-stats {
        flex-direction: row;
        justify-content: space-around;
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        width: 100%;
        left: 0 !important;
        padding-left: 3rem !important;
        padding-right: 0 !important;
    }

    .timeline-marker {
        left: 10px !important;
        right: auto !important;
    }

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

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

    .skills-grid {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    }

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

    .education-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .education-header h3 {
        margin-bottom: 0.5rem;
    }

    .education-date {
        margin-top: 0;
        align-self: flex-start;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .about-stats {
        flex-direction: column;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 200px;
    }
}

/* Smooth scrolling and animations */
@media (prefers-reduced-motion: no-preference) {
    .project-card,
    .skill-item,
    .timeline-content {
        opacity: 0;
        transform: translateY(20px);
        animation: fadeInUp 0.6s ease forwards;
    }

    .project-card:nth-child(1) { animation-delay: 0.1s; }
    .project-card:nth-child(2) { animation-delay: 0.2s; }
    .project-card:nth-child(3) { animation-delay: 0.3s; }
    .project-card:nth-child(4) { animation-delay: 0.4s; }

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

/* Print styles */
@media print {
    .navbar,
    .hero-buttons,
    .contact-form,
    .social-links {
        display: none;
    }

    .hero {
        padding-top: 0;
    }

    section {
        padding: 2rem 0;
    }
}