/* Reset & Normalize */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

:root {
    /* Colors */
    --bg-color: #fafafa;
    --text-color: #1a1a1a;
    --text-muted: #666666;
    --accent-color: #3b5bdb; /* muted indigo */
    --border-color: #e5e5e5;
    --card-bg: #ffffff;
    
    /* Typography */
    --font-sans: 'Inter', sans-serif;
    --font-mono: ui-monospace, "SF Mono", Consolas, monospace;
    
    /* Layout */
    --container-max: 900px;
    --nav-height: 72px;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    font-weight: 600;
    color: var(--text-color);
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: #2744ad;
}

p {
    margin-bottom: 1.2rem;
    color: var(--text-muted);
}

p:last-child {
    margin-bottom: 0;
}

/* Layout */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section {
    padding: 6rem 0;
}

.section-title {
    font-size: 1.75rem;
    margin-bottom: 3rem;
    position: relative;
    padding-bottom: 0.5rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background-color: var(--border-color);
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    background-color: rgba(250, 250, 250, 0.9);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo {
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--text-color);
    letter-spacing: -0.02em;
}

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

.nav-link {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
}

.nav-link:hover {
    color: var(--text-color);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-left: 1rem;
    padding-left: 2rem;
    border-left: 1px solid var(--border-color);
}

.badge {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    background-color: #f1f3f5;
    color: var(--text-muted);
    border: 1px solid var(--border-color);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 1.2rem;
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.btn-primary:hover {
    background-color: #333;
    border-color: #333;
    color: white;
}

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

.btn-outline:hover {
    border-color: var(--text-muted);
    color: var(--text-color);
}

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

.hero-content {
    max-width: 600px;
}

.hero-title {
    font-size: 3rem;
    letter-spacing: -0.03em;
    margin-bottom: 0.5rem;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--accent-color);
    font-weight: 500;
    margin-bottom: 2rem;
}

.hero-intro {
    font-size: 1.1rem;
    margin-bottom: 2.5rem;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    margin-bottom: 2.5rem;
}

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

.social-links a {
    color: var(--text-muted);
}

.social-links a:hover {
    color: var(--text-color);
}

/* Timeline (Experience) */
.timeline {
    border-left: 1px solid var(--border-color);
    padding-left: 2rem;
    margin-left: 0.5rem;
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -2.35rem;
    top: 0.25rem;
    width: 0.75rem;
    height: 0.75rem;
    border-radius: 50%;
    background-color: var(--bg-color);
    border: 2px solid var(--accent-color);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 1rem;
}

.role {
    font-size: 1.1rem;
    margin-bottom: 0.2rem;
}

.company {
    font-size: 0.95rem;
    font-weight: 400;
    color: var(--text-muted);
}

.company a {
    color: inherit;
    text-decoration: underline;
    text-decoration-color: var(--border-color);
    text-underline-offset: 4px;
}

.duration {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}

.timeline-desc {
    list-style-type: none;
}

.timeline-desc li {
    position: relative;
    padding-left: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.timeline-desc li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--border-color);
}

/* Projects */
.project-grid {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.project-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.project-card:hover {
    border-color: #d1d1d1;
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.03);
}

.project-content {
    flex-grow: 1;
}

.project-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.project-tagline {
    font-size: 0.95rem;
    color: var(--text-color);
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.project-desc {
    list-style-type: none;
    margin-bottom: 1.5rem;
}

.project-desc li {
    position: relative;
    padding-left: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.project-desc li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--border-color);
}

.project-features {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    background-color: var(--bg-color);
    padding: 1rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.project-features strong {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.project-features ol {
    padding-left: 1.5rem;
}

.project-features ol li {
    margin-bottom: 0.25rem;
}

.project-details {
    display: none;
    margin-top: 1rem;
}

.project-details.expanded {
    display: block;
}

.show-more-btn {
    background: none;
    border: none;
    color: var(--accent-color);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    padding: 0;
    margin-top: 0.5rem;
    margin-bottom: 1rem;
    display: inline-block;
}

.show-more-btn:hover {
    text-decoration: underline;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    padding: 0.25rem 0.6rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-muted);
}

.project-actions {
    margin-top: auto;
}

/* Skills */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2.5rem;
}

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

/* Contact */
.contact-content p {
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.contact-cards {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact-card {
    display: flex;
    align-items: center;
    padding: 1rem 1.5rem;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: border-color 0.2s ease;
}

.contact-card:hover {
    border-color: #d1d1d1;
}

.contact-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    margin-right: 1.5rem;
}

.contact-link {
    font-weight: 500;
    color: var(--text-color);
    font-size: 1rem;
    margin-right: auto;
}

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

.btn-copy {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: all 0.2s;
}

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

.copy-feedback {
    font-size: 0.8rem;
    color: var(--accent-color);
    margin-left: 0.5rem;
    opacity: 0;
    transition: opacity 0.3s;
}

.copy-feedback.show {
    opacity: 1;
}

/* Footer */
footer {
    padding: 3rem 0;
    border-top: 1px solid var(--border-color);
    margin-top: 2rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-content p {
    margin-bottom: 0;
    font-size: 0.9rem;
}

.footer-social {
    display: flex;
    gap: 1rem;
}

.footer-social a {
    color: var(--text-muted);
}

.footer-social a:hover {
    color: var(--text-color);
}

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

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: block;
    }
    
    .nav-links {
        position: absolute;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background-color: var(--card-bg);
        flex-direction: column;
        align-items: flex-start;
        padding: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease-out;
        border-bottom: 1px solid transparent;
        box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05);
        gap: 0;
    }
    
    .nav-links.open {
        max-height: 500px;
        border-bottom-color: var(--border-color);
    }

    .nav-link {
        width: 100%;
        padding: 1rem 1.5rem;
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav-link:last-child {
        border-bottom: none;
    }

    .nav-actions {
        border-left: none;
        padding: 1rem 1.5rem;
        margin: 0;
        display: flex;
        width: 100%;
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }
    
    .timeline-header {
        flex-direction: column;
    }
    
    .duration {
        margin-top: 0.25rem;
    }
}