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

:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --white: #ffffff;
    --accent: #3b82f6;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
}

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

/* Navigation */
nav {
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.logo {
    color: var(--primary-color);
    font-size: 1.8rem;
    font-weight: bold;
}

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

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

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

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

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    margin: 3px 0;
    transition: 0.3s;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: 120px 20px 80px;
    text-align: center;
    margin-top: 60px;
}

.profile-img {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    border: 5px solid var(--white);
    margin-bottom: 20px;
    object-fit: cover;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 10px;
}

.tagline {
    font-size: 1.3rem;
    margin-bottom: 30px;
    opacity: 0.95;
}

.social-links {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 30px;
}

.social-links a {
    color: var(--white);
    font-size: 1.5rem;
    transition: transform 0.3s;
}

.social-links a:hover {
    transform: scale(1.2);
}

.btn-primary, .btn-secondary {
    display: inline-block;
    padding: 12px 30px;
    margin: 10px;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 600;
    transition: all 0.3s;
}

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

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

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

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

/* Section Styles */
section {
    padding: 80px 20px;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    color: var(--text-dark);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: var(--primary-color);
    margin: 20px auto;
}

/* About Section */
.about {
    background: var(--bg-light);
}

.about-text p {
    font-size: 1.1rem;
    margin-bottom: 20px;
    color: var(--text-light);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.contact-info {
    margin-top: 30px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.contact-info p {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1rem;
}

.contact-info i {
    color: var(--primary-color);
    width: 20px;
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.skill-card {
    background: var(--white);
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.skill-card:hover {
    transform: translateY(-10px);
}

.skill-card i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.skill-card h3 {
    margin-bottom: 10px;
    color: var(--text-dark);
}

.skill-card p {
    color: var(--text-light);
}

/* Education Section */
.education {
    background: var(--bg-light);
}

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

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--primary-color);
}

.timeline-item {
    position: relative;
    padding-left: 60px;
    margin-bottom: 50px;
}

.timeline-dot {
    position: absolute;
    left: 11px;
    top: 0;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    border: 4px solid var(--white);
}

.timeline-content {
    background: var(--white);
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.timeline-content h3 {
    color: var(--primary-color);
    margin-bottom: 5px;
}

.timeline-content h4 {
    color: var(--text-dark);
    margin-bottom: 10px;
}

.institution {
    color: var(--text-light);
    font-weight: 600;
}

.date {
    color: var(--text-light);
    font-style: italic;
    margin: 5px 0;
}

.gpa, .project {
    margin-top: 10px;
    color: var(--text-dark);
}

/* Achievements Section */
.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-bottom: 50px;
}

.achievement-card {
    background: var(--white);
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.3s;
}

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

.achievement-card.highlight {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
}

.achievement-card i {
    font-size: 2.5rem;
    margin-bottom: 15px;
    color: var(--accent);
}

.achievement-card.highlight i {
    color: var(--white);
}

.achievement-card h3 {
    margin-bottom: 10px;
}

.achievement-card p {
    font-size: 0.95rem;
    line-height: 1.5;
}

.cert-title {
    text-align: center;
    font-size: 1.8rem;
    margin: 50px 0 30px;
}

.certifications {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.cert-badge {
    background: var(--primary-color);
    color: var(--white);
    padding: 20px 30px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    gap: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.cert-badge i {
    font-size: 2rem;
}

/* Interests Section */
.interests {
    background: var(--bg-light);
}

.interests-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.interest-item {
    background: var(--white);
    padding: 25px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

.interest-item i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

/* Contact Section */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 15px;
    margin-bottom: 20px;
    border: 2px solid #e5e7eb;
    border-radius: 5px;
    font-size: 1rem;
    transition: border 0.3s;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.contact-form button {
    width: 100%;
    padding: 15px;
    background: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: 5px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background 0.3s;
}

.contact-form button:hover {
    background: var(--secondary-color);
}

.contact-item {
    display: flex;
    gap: 20px;
    margin-bottom: 25px;
}

.contact-item i {
    font-size: 1.5rem;
    color: var(--primary-color);
    width: 30px;
}

.contact-item h4 {
    margin-bottom: 5px;
}

.languages {
    margin-top: 30px;
}

.languages h4 {
    margin-bottom: 10px;
}

/* Footer */
footer {
    background: var(--text-dark);
    color: var(--white);
    padding: 30px 20px;
    text-align: center;
}

.footer-links {
    margin-top: 15px;
    display: flex;
    justify-content: center;
    gap: 20px;
}

.footer-links a {
    color: var(--white);
    font-size: 1.3rem;
    transition: color 0.3s;
}

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

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

    .nav-links {
        position: absolute;
        top: 60px;
        left: -100%;
        flex-direction: column;
        background: var(--white);
        width: 100%;
        padding: 20px;
        box-shadow: 0 5px 10px rgba(0,0,0,0.1);
        transition: left 0.3s;
    }

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

    .hero h1 {
        font-size: 2rem;
    }

    .tagline {
        font-size: 1rem;
    }

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

    .timeline::before {
        left: 10px;
    }

    .timeline-item {
        padding-left: 40px;
    }
}