/* ===== CSS Variables ===== */
:root {
    /* Colors */
    --bg-primary: #F5F5F0;
    --bg-secondary: #EAEAE5;
    --text-primary: #1A1A1A;
    --text-secondary: #4A4A4A;
    --text-muted: #6B6B6B;
    --accent-blue: #00D4FF;
    --accent-pink: #E91E63;
    --white: #FFFFFF;

    /* Typography */
    --font-sans: 'Satoshi', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Satoshi', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'Satoshi', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Spacing */
    --container-width: 1100px;
    --section-padding: 5rem;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

/* ===== Navigation ===== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: rgba(245, 245, 240, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--bg-secondary);
}

.logo {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

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

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.2s ease;
}

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

/* ===== Hero Section ===== */
.hero {
    min-height: 90vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: calc(var(--section-padding) + 4rem) 2rem 2rem;
    position: relative;
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    transition: color 0.2s ease;
    animation: bounce 2s infinite;
}

.scroll-indicator:hover {
    color: var(--accent-blue);
}

.scroll-indicator svg {
    width: 20px;
    height: 20px;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-6px);
    }
    60% {
        transform: translateX(-50%) translateY(-3px);
    }
}

.hero-content {
    max-width: var(--container-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-text h1 {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1rem;
}

.hero-text .de-paula {
    color: var(--text-secondary);
    font-weight: 500;
}

.tagline {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    color: var(--accent-blue);
    font-weight: 500;
    margin-bottom: 0.5rem;
    letter-spacing: -0.01em;
}

.role {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.hero-links {
    display: flex;
    gap: 1rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 6px;
    transition: all 0.2s ease;
}

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

.btn-primary:hover {
    background: var(--accent-blue);
}

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

.btn-secondary:hover {
    border-color: var(--accent-pink);
    color: var(--accent-pink);
}

.hero-image {
    display: flex;
    justify-content: center;
}

.headshot {
    width: 320px;
    height: 320px;
    object-fit: cover;
    border-radius: 12px;
    box-shadow:
        0 20px 40px rgba(0, 0, 0, 0.1),
        0 0 0 1px rgba(0, 0, 0, 0.05);
}

/* ===== Section Base ===== */
.section {
    padding: var(--section-padding) 0;
}

.section h2 {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 2.5rem;
    position: relative;
}

.section h2::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 40px;
    height: 3px;
    background: var(--accent-blue);
}

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

.about-content {
    max-width: 720px;
}

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

.about-content p:last-child {
    margin-bottom: 0;
}

.about-content strong {
    color: var(--text-primary);
}

/* ===== Projects Section ===== */
.project-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.project-card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--bg-secondary);
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
    border-color: var(--accent-blue);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.project-name {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
}

.project-stars {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.project-stars::before {
    content: '\2605';
    color: #F59E0B;
}

.project-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    flex-grow: 1;
}

.project-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.project-lang, .project-tag, .project-org {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-weight: 500;
}

.project-lang {
    background: var(--bg-secondary);
    color: var(--text-secondary);
}

.project-lang.python::before {
    content: '\25CF ';
    color: #3776AB;
}

.project-lang.jupyter::before {
    content: '\25CF ';
    color: #F37626;
}

.project-tag {
    background: rgba(0, 212, 255, 0.1);
    color: #0891B2;
}

.project-org {
    background: rgba(233, 30, 99, 0.1);
    color: var(--accent-pink);
}

/* ===== Expertise Section ===== */
.expertise {
    background: var(--bg-secondary);
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.expertise-card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
}

.expertise-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 1rem;
    color: var(--accent-blue);
}

.expertise-icon svg {
    width: 100%;
    height: 100%;
}

.expertise-card h3 {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.expertise-card p {
    font-size: 0.875rem;
    color: var(--text-muted);
    line-height: 1.5;
}

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

.contact h2::after {
    left: 50%;
    transform: translateX(-50%);
}

.contact-intro {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    background: var(--white);
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.2s ease;
    border: 1px solid var(--bg-secondary);
}

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

.contact-link svg {
    width: 20px;
    height: 20px;
}

/* ===== Footer ===== */
.footer {
    padding: 2rem 0;
    border-top: 1px solid var(--bg-secondary);
}

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

.footer .logo {
    font-size: 1.25rem;
}

.footer p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ===== Blog Section ===== */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.blog-card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--bg-secondary);
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
}

.blog-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
    border-color: var(--accent-blue);
}

.blog-card-date {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.blog-card-title {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    line-height: 1.3;
}

.blog-card-excerpt {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    flex-grow: 1;
}

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

.blog-tag {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-weight: 500;
    background: rgba(0, 212, 255, 0.1);
    color: #0891B2;
}

.blog-section .view-all {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 2rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.2s ease;
}

.blog-section .view-all:hover {
    color: var(--accent-blue);
}

.blog-section .view-all svg {
    width: 16px;
    height: 16px;
}

/* ===== Blog Page Styles ===== */
.blog-header {
    padding: calc(var(--section-padding) + 4rem) 0 var(--section-padding);
}

.blog-header h1 {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.blog-header p {
    color: var(--text-secondary);
}

.blog-list {
    padding-bottom: var(--section-padding);
}

.blog-list .blog-grid {
    grid-template-columns: repeat(2, 1fr);
}

/* ===== Post Page Styles ===== */
.post-header {
    padding: calc(var(--section-padding) + 4rem) 0 2rem;
    border-bottom: 1px solid var(--bg-secondary);
    margin-bottom: 2rem;
}

.post-header .container {
    max-width: 720px;
}

.post-meta {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.post-header h1 {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.post-header .blog-card-tags {
    margin-top: 1rem;
}

/* ===== Blog Content (Rendered Markdown) ===== */
.blog-content {
    max-width: 720px;
    margin: 0 auto;
    padding: 0 1.5rem var(--section-padding);
}

.blog-content h1,
.blog-content h2,
.blog-content h3,
.blog-content h4 {
    font-family: var(--font-heading);
    font-weight: 600;
    color: var(--text-primary);
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.blog-content h1 { font-size: 2rem; }
.blog-content h2 { font-size: 1.5rem; }
.blog-content h3 { font-size: 1.25rem; }
.blog-content h4 { font-size: 1.1rem; }

.blog-content p {
    margin-bottom: 1.25rem;
    color: var(--text-secondary);
}

.blog-content a {
    color: var(--accent-blue);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.blog-content a:hover {
    color: var(--accent-pink);
}

.blog-content ul,
.blog-content ol {
    margin-bottom: 1.25rem;
    padding-left: 1.5rem;
    color: var(--text-secondary);
}

.blog-content li {
    margin-bottom: 0.5rem;
}

.blog-content strong {
    color: var(--text-primary);
    font-weight: 600;
}

.blog-content blockquote {
    border-left: 3px solid var(--accent-blue);
    padding-left: 1rem;
    margin: 1.5rem 0;
    color: var(--text-muted);
    font-style: italic;
}

.blog-content code {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.9em;
    background: var(--bg-secondary);
    padding: 0.2em 0.4em;
    border-radius: 4px;
}

.blog-content pre {
    background: #2D2D2D;
    color: #F8F8F2;
    padding: 1.25rem;
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 1.5rem;
}

.blog-content pre code {
    background: none;
    padding: 0;
    font-size: 0.875rem;
    color: inherit;
}

.blog-content hr {
    border: none;
    border-top: 1px solid var(--bg-secondary);
    margin: 2rem 0;
}

.blog-content img {
    border-radius: 8px;
    margin: 1.5rem 0;
}

/* Back to blog link */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: 1rem;
    transition: color 0.2s ease;
}

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

.back-link svg {
    width: 16px;
    height: 16px;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .expertise-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 3rem;
    }

    .nav-links {
        display: none;
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-text h1 {
        font-size: 2.5rem;
    }

    .hero-links {
        justify-content: center;
    }

    .hero-image {
        order: -1;
    }

    .headshot {
        width: 200px;
        height: 200px;
    }

    .section h2::after {
        left: 50%;
        transform: translateX(-50%);
    }

    .about,
    .about-content {
        text-align: center;
    }

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

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

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

    .blog-list .blog-grid {
        grid-template-columns: 1fr;
    }

    .post-header h1 {
        font-size: 1.75rem;
    }

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

    .footer .container {
        flex-direction: column;
        gap: 0.5rem;
    }
}