:root {
    --primary-color: #1e88e5;
    --secondary-color: #0d47a1;
    --accent-color: #64b5f6;
    --light-bg: #f5f9ff;
    --dark-bg: #0a1929;
    --light-text: #333;
    --dark-text: #f0f0f0;
    --light-card: #ffffff;
    --dark-card: #0d2136;
    --transition: all 0.3s ease;
    --border-radius: 8px;
    --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Work Sans", sans-serif;
    background-color: var(--light-bg);
    color: var(--light-text);
    font-size: 16px;
    line-height: 1.6;
    transition: var(--transition);
}

body.dark {
    background-color: var(--dark-bg);
    color: var(--dark-text);
}

h1, h2, h3, h4, h5, h6 {
    margin-bottom: 0.5em;
    font-weight: 700;
}

h3 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.5rem;
}

h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: var(--primary-color);
}

p {
    margin-bottom: 1rem;
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: var(--transition);
}

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

.btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

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

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

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

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

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

body.dark .navbar {
    background-color: rgba(10, 25, 41, 0.95);
}

.name h2 {
    font-size: 1.8rem;
    margin: 0;
    color: var(--primary-color);
}

body.dark .name h2 {
    color: var(--accent-color);
}

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

.nav-links a {
    color: var(--light-text);
    font-weight: 500;
    position: relative;
}

body.dark .nav-links a {
    color: var(--dark-text);
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--primary-color);
    transition: var(--transition);
}

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

.icon-button {
    background: none;
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px;
    font-size: 24px;
    color: var(--light-text);
    transition: var(--transition);
}

body.dark .icon-button {
    color: var(--dark-text);
}

.icon-button:hover {
    transform: scale(1.1);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem 5%;
    background-color: var(--light-bg);
    transition: var(--transition);
}

body.dark .hero {
    background-color: var(--dark-bg);
}

.hero-content {
    max-width: 700px;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 0.5rem;
}

.hero h2 {
    font-size: 2rem;
    font-weight: 500;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

body.dark .hero h2 {
    color: var(--accent-color);
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

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

/* About Section */
.about {
    padding: 5rem 5%;
    background-color: var(--light-card);
    transition: var(--transition);
}

body.dark .about {
    background-color: var(--dark-card);
}

.about-content {
    display: flex;
    align-items: center;
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.about-text {
    font-size: 1.1rem;
}

/* Skills Section */
.skills-section {
    padding: 5rem 5%;
    background-color: var(--light-bg);
    transition: var(--transition);
}

body.dark .skills-section {
    background-color: var(--dark-bg);
}

.skills-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.skill-category {
    background-color: var(--light-card);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--box-shadow);
    flex: 1 1 300px;
    transition: var(--transition);
}

body.dark .skill-category {
    background-color: var(--dark-card);
}

.skill-category h4 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    text-align: center;
    color: var(--primary-color);
}

body.dark .skill-category h4 {
    color: var(--accent-color);
}

.skill-items {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.skill-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background-color: rgba(30, 136, 229, 0.1);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

body.dark .skill-item {
    background-color: rgba(100, 181, 246, 0.1);
}

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

body.dark .skill-item i {
    color: var(--accent-color);
}

/* Projects Section */
.projects-section {
    padding: 5rem 5%;
    background-color: var(--light-card);
    transition: var(--transition);
}

body.dark .projects-section {
    background-color: var(--dark-card);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.project-card {
    background-color: var(--light-bg);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

body.dark .project-card {
    background-color: var(--dark-bg);
}

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

.project-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.project-header i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

body.dark .project-header i {
    color: var(--accent-color);
}

.project-header h4 {
    font-size: 1.3rem;
    margin: 0;
}

.project-description {
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

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

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
}

body.dark .project-link {
    color: var(--accent-color);
}

/* Education Section */
.education-section {
    padding: 5rem 5%;
    background-color: var(--light-bg);
    transition: var(--transition);
}

body.dark .education-section {
    background-color: var(--dark-bg);
}

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

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

body.dark .timeline::before {
    background-color: var(--accent-color);
}

.timeline-item {
    padding: 1rem;
    position: relative;
    width: 50%;
    margin-bottom: 2rem;
}

.timeline-item:nth-child(odd) {
    left: 0;
    padding-right: 40px;
}

.timeline-item:nth-child(even) {
    left: 50%;
    padding-left: 40px;
}

.timeline-dot {
    width: 16px;
    height: 16px;
    background-color: var(--primary-color);
    border-radius: 50%;
    position: absolute;
    top: 20px;
}

body.dark .timeline-dot {
    background-color: var(--accent-color);
}

.timeline-item:nth-child(odd) .timeline-dot {
    right: -8px;
}

.timeline-item:nth-child(even) .timeline-dot {
    left: -8px;
}

.timeline-content {
    background-color: var(--light-card);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

body.dark .timeline-content {
    background-color: var(--dark-card);
}

.timeline-content h4 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

body.dark .timeline-content h4 {
    color: var(--accent-color);
}

.timeline-institution {
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.timeline-details {
    color: #555;
}

body.dark .timeline-details {
    color: #aaa;
}

/* Links Section */
.links-section {
    padding: 5rem 5%;
    background-color: var(--light-card);
    transition: var(--transition);
}

body.dark .links-section {
    background-color: var(--dark-card);
}

.social-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.social-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 2rem;
    background-color: var(--light-bg);
    border-radius: var(--border-radius);
    transition: var(--transition);
    min-width: 200px;
    justify-content: center;
}

body.dark .social-link {
    background-color: var(--dark-bg);
}

.social-link:hover {
    transform: translateY(-5px);
}

.social-link i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

body.dark .social-link i {
    color: var(--accent-color);
}

/* Footer */
.footer {
    padding: 2rem 5%;
    background-color: var(--dark-bg);
    color: var(--dark-text);
    text-align: center;
}

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

.footer p {
    margin-bottom: 1rem;
}

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

.footer a {
    color: var(--accent-color);
}

.footer a:hover {
    text-decoration: underline;
}