:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #121212;
    --text-secondary: #495057;
    --accent-color: #000000;
    --font-sans: 'Inter', -apple-system, system-ui, sans-serif;
    --nav-height: 80px;
    --transition: all 0.25s cubic-bezier(0.645, 0.045, 0.355, 1);
}

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

html {
    scroll-behavior: smooth;
    scrollbar-width: thin;
    scrollbar-color: var(--text-secondary) var(--bg-primary);
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 24px;
}

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

a:hover {
    color: var(--accent-color);
    opacity: 0.8;
}

ul {
    list-style: none;
}

/* Typography */
h1, h2, h3, h4 {
    color: var(--text-primary);
    font-weight: 600;
}

p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.highlight {
    font-weight: 600;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    padding: 0 4px;
    border-radius: 4px;
}

.section-title {
    font-size: 2rem;
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    height: 1px;
    width: 300px;
    background-color: var(--bg-tertiary);
    margin-left: 20px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    height: var(--nav-height);
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 100;
    transition: var(--transition);
}

.navbar.scrolled {
    box-shadow: 0 10px 30px -10px rgba(2, 12, 27, 0.7);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
    letter-spacing: 1px;
}

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

.nav-links a {
    color: var(--text-primary);
    font-size: 0.9rem;
}

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

.mobile-menu-btn {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 6px;
}

.mobile-menu-btn span {
    display: block;
    width: 30px;
    height: 2px;
    background-color: var(--accent-color);
    transition: var(--transition);
}

/* Hero Section */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--nav-height);
}

.greeting {
    color: var(--accent-color);
    margin-bottom: 20px;
    font-size: 1.1rem;
}

.name {
    font-size: 4.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.title {
    font-size: 4rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.1;
}

.hero-section .summary {
    max-width: 600px;
    font-size: 1.1rem;
    margin-bottom: 40px;
}

.cta-buttons {
    display: flex;
    gap: 20px;
}

.btn {
    display: inline-block;
    padding: 1rem 1.75rem;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.btn-primary {
    background-color: transparent;
    color: var(--accent-color);
    border: 1px solid var(--accent-color);
}

.btn-primary:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--bg-tertiary);
}

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

/* Sections General */
.section {
    padding: 100px 0;
}

/* Experience Timeline */
.timeline {
    position: relative;
    max-width: 800px;
}

.timeline::after {
    content: '';
    position: absolute;
    width: 2px;
    background-color: var(--bg-tertiary);
    top: 0;
    bottom: 0;
    left: 15px;
    margin-left: -1px;
}

.timeline-item {
    padding: 10px 40px 40px;
    position: relative;
    background-color: inherit;
    width: 100%;
}

.timeline-dot {
    position: absolute;
    width: 16px;
    height: 16px;
    left: 7px;
    background-color: var(--bg-primary);
    border: 2px solid var(--accent-color);
    border-radius: 50%;
    z-index: 1;
    top: 15px;
}

.timeline-content {
    padding: 24px;
    background-color: var(--bg-secondary);
    border-radius: 8px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.timeline-content:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.2);
}

.timeline-content h3 {
    color: var(--text-primary);
    font-size: 1.3rem;
}

.timeline-content h4 {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 400;
    margin-bottom: 15px;
}

.company-link {
    color: var(--accent-color);
}

.timeline-content ul {
    list-style-type: none;
}

.timeline-content li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 10px;
    color: var(--text-secondary);
}

.timeline-content li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--accent-color);
}

/* Education Card */
.card {
    background-color: var(--bg-secondary);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

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

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    flex-wrap: wrap;
}

.date {
    color: var(--accent-color);
    font-size: 0.9rem;
}

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

.skill-category h3 {
    margin-bottom: 20px;
    color: var(--text-primary);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.skill-tag {
    background-color: rgba(0, 0, 0, 0.05);
    color: var(--accent-color);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
}

/* Projects */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.project-card {
    background-color: var(--bg-secondary);
    border-radius: 8px;
    padding: 2rem;
    height: 100%;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-7px);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.project-header svg {
    color: var(--accent-color);
    width: 40px;
    height: 40px;
}

.project-header h3 {
    font-size: 1.25rem;
}

.project-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.project-tech {
    margin-top: auto;
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    padding-top: 20px;
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.placeholder-text {
    font-style: italic;
    margin-bottom: 20px;
}

/* Contact */
.contact-container {
    text-align: center;
    max-width: 600px;
}

.contact-container .section-title {
    justify-content: center;
}

.contact-container .section-title::after {
    display: none;
}

.contact-container p {
    margin-bottom: 40px;
}

.btn-large {
    padding: 1.25rem 2.25rem;
    font-size: 1.1rem;
}

.social-links {
    margin-top: 50px;
    display: flex;
    justify-content: center;
    gap: 20px;
}

.social-links a {
    color: var(--text-secondary);
    display: inline-block;
    transition: var(--transition);
}

.social-links a:hover {
    color: var(--accent-color);
    transform: translateY(-3px);
}

/* Footer */
footer {
    text-align: center;
    padding: 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    background-color: var(--bg-primary);
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.appear {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background-color: var(--bg-secondary);
        flex-direction: column;
        align-items: center;
        padding: 20px 0;
        box-shadow: 0 10px 30px -10px rgba(2, 12, 27, 0.7);
    }

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

    .mobile-menu-btn {
        display: flex;
    }

    .name {
        font-size: 3rem;
    }
    
    .title {
        font-size: 2.5rem;
    }

    .section-title::after {
        width: 100%;
    }

    .timeline::after {
        left: 15px;
    }

    .timeline-item {
        padding: 10px 20px 40px 40px;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
}