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

:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --text-color: #333;
    --bg-color: #ffffff;
    --light-bg: #f8f9fa;
    --border-color: #e0e0e0;
    --hover-color: #2980b9;
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

/* Navigation */
.navbar {
    position: sticky;
    top: 0;
    background-color: var(--bg-color);
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    z-index: 1000;
    padding: 1rem 0;
}

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

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

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

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

.menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    margin: 3px 0;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    padding: 4rem 0;
    text-align: center;
    background: linear-gradient(135deg, var(--light-bg) 0%, var(--bg-color) 100%);
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.hero-image {
    margin-bottom: 1rem;
}

.hero-image img {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--secondary-color);
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.hero h1 {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.hero h2 {
    font-size: 1.5rem;
    color: var(--secondary-color);
    font-weight: 400;
}

/* Sections */
section {
    padding: 4rem 0;
}

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

section h2 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 2rem;
    text-align: center;
}

section h3 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    margin-top: 2rem;
}

section p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1rem;
    text-align: center;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

section p a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: var(--transition);
    border-bottom: 1px solid transparent;
}

section p a:hover {
    color: var(--hover-color);
    border-bottom-color: var(--hover-color);
}

/* Summary Section */
.summary {
    text-align: center;
}

/* Project Grid */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.project-card {
    background: var(--bg-color);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}

.project-card h3,
.project-card h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.project-card h4 {
    font-size: 1.3rem;
}

.project-card p {
    text-align: left;
    margin-bottom: 1rem;
    color: #666;
}

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

.tag {
    background-color: var(--light-bg);
    color: var(--primary-color);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    border: 1px solid var(--border-color);
}

.project-link {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    display: inline-block;
}

.project-link:hover {
    color: var(--hover-color);
    transform: translateX(5px);
}

/* Resume Section */
.resume-section {
    text-align: center;
}

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--secondary-color);
    color: white;
    padding: 1rem 2rem;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    margin-top: 1rem;
}

.btn-download:hover {
    background-color: var(--hover-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(52, 152, 219, 0.3);
}

/* Skills Section */
.skills-tldr {
    text-align: center;
    margin-bottom: 1rem;
}

.expand-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin: 1rem auto;
    padding: 0.8rem 1.5rem;
    background-color: var(--light-bg);
    border: 2px solid var(--border-color);
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition);
}

.expand-btn:hover {
    background-color: var(--border-color);
}

.expand-btn i {
    transition: var(--transition);
}

.expand-btn.expanded i {
    transform: rotate(180deg);
}

.skills-content {
    display: none;
    margin-top: 2rem;
}

.skills-content.expanded {
    display: block;
}

.skills-category {
    margin-bottom: 2rem;
}

.skills-category h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.skills-category ul {
    list-style: none;
    padding-left: 0;
}

.skills-category li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.skills-category li:before {
    content: "•";
    color: var(--secondary-color);
    font-weight: bold;
    position: absolute;
    left: 0;
}

/* Technical Writing */
.writing-list {
    list-style: none;
    max-width: 600px;
    margin: 0 auto;
}

.writing-list li {
    padding: 1rem;
    margin-bottom: 0.5rem;
    background-color: var(--bg-color);
    border-left: 4px solid var(--secondary-color);
    border-radius: 4px;
}

.writing-list a {
    color: var(--secondary-color);
    text-decoration: none;
    font-size: 1.1rem;
    transition: var(--transition);
}

.writing-list a:hover {
    color: var(--hover-color);
}

/* Speaking Engagements - YouTube Grid */
.youtube-grid {
    display: grid !important;
    grid-template-columns: repeat(3, 1fr) !important;
    grid-auto-flow: row;
    gap: 2rem;
    margin-top: 2rem;
    width: 100%;
}

.youtube-video {
    position: relative;
    width: 100%;
    height: 0;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    overflow: hidden;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    background-color: #000;
    transition: var(--transition);
    display: block;
}

.youtube-video:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.youtube-video iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
    border-radius: 12px;
}

.talks-list {
    list-style: none;
    max-width: 600px;
    margin: 0 auto;
}

.talks-list li {
    padding: 1rem;
    margin-bottom: 0.5rem;
    background-color: var(--bg-color);
    border-left: 4px solid var(--secondary-color);
    border-radius: 4px;
}

.talks-list a {
    color: var(--secondary-color);
    text-decoration: none;
    font-size: 1.1rem;
    transition: var(--transition);
}

.talks-list a:hover {
    color: var(--hover-color);
}

/* Outside Work */
.outside-work {
    text-align: center;
}

/* Open Source */
.contributions-list {
    list-style: none;
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contributions-list li {
    padding: 1rem;
    background-color: var(--bg-color);
    border-left: 4px solid var(--secondary-color);
    border-radius: 4px;
}

.contributions-list a {
    color: var(--secondary-color);
    text-decoration: none;
    font-size: 1.1rem;
    transition: var(--transition);
}

.contributions-list a:hover {
    color: var(--hover-color);
}

/* Contact Section */
.contact {
    text-align: center;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    margin-top: 2rem;
}

.social-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--secondary-color);
    text-decoration: none;
    font-size: 1.1rem;
    padding: 0.8rem 1.5rem;
    border: 2px solid var(--secondary-color);
    border-radius: 5px;
    transition: var(--transition);
}

.social-link:hover {
    background-color: var(--secondary-color);
    color: white;
    transform: translateY(-2px);
}

/* Footer */
footer {
    background-color: var(--primary-color);
    color: white;
    padding: 3rem 0 2rem;
    text-align: center;
}

.footer-top {
    margin-bottom: 2rem;
}

.footer-top h3 {
    color: white;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

footer .social-links {
    margin-top: 1rem;
}

footer .social-link {
    color: white;
    border-color: white;
}

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

.back-to-top {
    color: white;
    text-decoration: none;
    transition: var(--transition);
    display: inline-block;
    margin-top: 1rem;
    opacity: 0.8;
}

.back-to-top:hover {
    color: var(--secondary-color);
    opacity: 1;
}

/* Responsive Design */
@media (min-width: 1024px) {
    .youtube-grid {
        grid-template-columns: repeat(3, 1fr) !important;
    }
}

@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--bg-color);
        flex-direction: column;
        padding: 1rem;
        box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    }

    .nav-links.active {
        display: flex;
    }

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

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

    section h2 {
        font-size: 2rem;
    }

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

    .youtube-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .talks-table {
        font-size: 0.9rem;
    }

    .talks-table th,
    .talks-table td {
        padding: 0.5rem;
    }

    .social-links {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .hero-image img {
        width: 150px;
        height: 150px;
    }

    .hero h1 {
        font-size: 1.5rem;
    }

    section h2 {
        font-size: 1.5rem;
    }

    .youtube-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
}