:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --text-color: #333;
    --light-gray: #f5f6fa;
    --border-color: #dcdde1;
    --timeline-color: #3498db;
}

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

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

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

/* Header & Navigation */
header {
    background-color: white;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav {
    padding: 1rem 0;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    z-index: 1001;
    margin-right: 10px;
}

.menu-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background-color: var(--primary-color);
    margin: 4px 0;
    transition: all 0.3s ease;
    opacity: 0.8;
}

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

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

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

/* Mobile Navigation */
@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 60%;
        height: 100vh;
        background-color: white;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 1.5rem;
        transition: right 0.3s ease;
        box-shadow: -2px 0 5px rgba(0,0,0,0.1);
        padding: 60px 0;
    }

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

    /* Hamburger Animation */
    .menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(4px, 4px);
    }

    .menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(4px, -4px);
    }
}

/* Hero Section */
#hero {
    padding: 120px 0 10px;
    text-align: center;
    background-color: var(--light-gray);
}

.profile-img {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 2rem;
    border: 5px solid white;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

#hero h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

#hero h2 {
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
}

.contact-info {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 1rem;
}

.contact-info a {
    color: var(--primary-color);
    font-size: 1.5rem;
    transition: color 0.3s ease;
}

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

.resume-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    margin-top: 2rem;
    padding: 0.75rem 1.5rem;
    background-color: transparent;
    border: 2px solid var(--secondary-color);
    color: var(--secondary-color);
    font-size: 1rem;
    font-weight: 500;
    border-radius: 4px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.resume-btn i {
    font-size: 1.1rem;
}

.resume-btn:hover {
    background-color: var(--secondary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.2);
}

/* Sections */
section {
    padding: 80px 0;
}

section:nth-child(even) {
    background-color: var(--light-gray);
}

section h2 {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--primary-color);
    font-size: 2rem;
}

/* Timeline */
.timeline {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.timeline::before {
    content: '';
    position: absolute;
    width: 2px;
    background-color: var(--timeline-color);
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -1px;
}

.timeline-item {
    padding: 20px 0;
    position: relative;
    display: flex;
    justify-content: space-between;
}

.timeline-item::before {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    background-color: white;
    border: 2px solid var(--timeline-color);
    border-radius: 50%;
    top: 24px;
    left: 50%;
    transform: translate(-50%, 0);
    z-index: 1;
}

.timeline-header {
    width: calc(50% - 50px);
    padding-right: 30px;
    text-align: right;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.timeline-content {
    width: calc(50% - 50px);
    padding-left: 30px;
    display: flex;
    flex-direction: column;
}

.company-logo {
    width: 120px;
    height: 60px;
    object-fit: contain;
}

.timeline-header h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1.4rem;
}

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

.date, .location {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.date::before {
    content: '\f073';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    color: var(--secondary-color);
}

.location::before {
    content: '\f3c5';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    color: var(--secondary-color);
}

.timeline-content ul {
    padding-left: 1.5rem;
    flex-grow: 1;
    margin-top: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.timeline-content ul li {
    margin-bottom: 0.8rem;
    position: relative;
    line-height: 1.6;
}

.timeline-content ul li::marker {
    color: var(--secondary-color);
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
}

.tech-stack span {
    background-color: var(--light-gray);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--primary-color);
    transition: all 0.3s ease;
}

.tech-stack span:hover {
    background-color: var(--secondary-color);
    color: white;
    transform: translateY(-2px);
}

/* Education */
.education-item {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    max-width: 800px;
    margin: 0 auto;
}

.education-header {
    display: flex;
    align-items: center;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

.education-info {
    flex: 1;
}

.education-info h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1.4rem;
}

.education-info h4 {
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.school-logo {
    width: 100px;
    height: 100px;
    object-fit: contain;
}

.coursework {
    margin-top: 1.5rem;
}

.coursework ul {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 0.5rem;
    margin-top: 0.5rem;
}

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

.project-card {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

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

/* Skills */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.skill-category {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.skill-category h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.skill-tags span {
    background-color: var(--light-gray);
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.9rem;
}

/* Footer */
footer {
    background-color: var(--primary-color);
    color: white;
    padding: 2rem 0;
    text-align: center;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-content {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }

    .timeline::before {
        display: none;
    }

    .timeline-item::before {
        display: none;
    }

    .timeline-item {
        flex-direction: column;
        padding: 30px 0;
    }

    .timeline-header {
        width: 100%;
        padding-right: 0;
        text-align: left;
        align-items: flex-start;
        margin-bottom: 1.5rem;
    }

    .timeline-content {
        width: 100%;
        padding-left: 0;
    }

    .company-logo {
        width: 100px;
        height: 60px;
        margin-bottom: 1rem;
    }

    .timeline-header h3 {
        font-size: 1.2rem;
    }

    .timeline-header h4 {
        font-size: 1.1rem;
    }

    .tech-stack {
        gap: 0.5rem;
    }

    .tech-stack span {
        padding: 0.3rem 0.8rem;
        font-size: 0.8rem;
    }

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

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

@media (max-width: 480px) {
    #hero h1 {
        font-size: 2rem;
    }

    #hero h2 {
        font-size: 1.2rem;
    }

    .profile-img {
        width: 150px;
        height: 150px;
    }

    section {
        padding: 40px 0;
    }

    .education-header {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }

    .education-info {
        text-align: center;
    }
}