:root {
    --color-bg: #f8f9fa;
    --color-text: #1a1a1a;
    --color-text-muted: #555;
    --color-blue: rgb(43, 122, 199);
    --color-blue-hover: rgb(33, 102, 169);
    --color-orange: rgb(255, 109, 39);
    --color-orange-hover: rgb(225, 89, 19);
    --color-border: #ddd;
    --color-card-bg: #ffffff;
    --color-code-bg: #1a1a1a;
    --color-code-text: #f8f8f2;
    --font-display: 'Space Mono', monospace;
    --font-body: 'Lato', sans-serif;
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #121212;
        --color-text: #e4e4e4;
        --color-text-muted: #a0a0a0;
        --color-blue: rgb(82, 156, 230);
        --color-blue-hover: rgb(120, 180, 240);
        --color-orange: rgb(255, 135, 80);
        --color-orange-hover: rgb(255, 160, 110);
        --color-border: #333;
        --color-card-bg: #1e1e1e;
        --color-code-bg: #0d0d0d;
        --color-code-text: #f8f8f2;
    }
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.65;
    font-size: 17px;
}

h1, h2 {
    font-family: var(--font-display);
}

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

a:hover {
    color: var(--color-blue-hover);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navigation */
.site-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(248, 249, 250, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
    padding: 16px 0;
}

@media (prefers-color-scheme: dark) {
    .site-nav {
        background: rgba(18, 18, 18, 0.95);
    }
}

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

.nav-logo {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 400;
    letter-spacing: -0.01em;
}

.nav-logo .blue {
    color: var(--color-blue);
}

.nav-logo .orange {
    color: var(--color-orange);
}

.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
}

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

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-orange);
}

.nav-separator {
    color: var(--color-border);
    font-weight: 300;
    user-select: none;
}

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

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: all 0.3s ease;
}

/* Hero */
.hero {
    padding: 140px 0 80px;
    border-bottom: 3px solid var(--color-blue);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 48px;
    align-items: center;
}

.hero-text h1 {
    font-size: clamp(2.5rem, 6vw, 3.5rem);
    font-weight: 400;
    line-height: 1.15;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

.hero-text h1 .blue,
.blue {
    color: var(--color-blue);
}

.hero-text h1 .orange,
.orange {
    color: var(--color-orange);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    max-width: 550px;
    line-height: 1.55;
}

.hero-subtitle strong {
    color: var(--color-text);
    font-weight: 700;
}

.hero-photo {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--color-orange);
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

/* Section styling */
section {
    padding: 80px 0;
}

.section-header {
    margin-bottom: 40px;
}

.section-label {
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-orange);
    margin-bottom: 8px;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 400;
}

/* Featured Work (Robotics) */
.featured {
    background: var(--color-card-bg);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.featured-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: start;
}

.featured-content h3 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.featured-meta {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.featured-content p {
    color: var(--color-text-muted);
    margin-bottom: 16px;
}

.featured-highlights {
    list-style: none;
    margin: 24px 0;
}

.featured-highlights li {
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
    color: var(--color-text-muted);
}

.featured-highlights li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--color-orange);
    font-weight: bold;
}

.featured-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 24px;
}

.featured-links a {
    font-size: 0.9rem;
    font-weight: 700;
    padding: 8px 16px;
    border: 2px solid var(--color-blue);
    border-radius: 4px;
    transition: all 0.2s ease;
}

.featured-links a:hover {
    background: var(--color-blue);
    color: white;
}

.featured-visual {
    border-radius: 8px;
    aspect-ratio: 4/3;
    overflow: hidden;
}

.featured-visual img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Work Grid */
.work-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.work-card {
    background: var(--color-card-bg);
    border: 2px solid var(--color-border);
    border-radius: 6px;
    padding: 28px;
    transition: all 0.2s ease;
}

.work-card:hover {
    border-color: var(--color-blue);
}

.work-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

.work-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
}

.work-card-year {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.work-card-role {
    font-size: 0.9rem;
    color: var(--color-orange);
    font-weight: 700;
    margin-bottom: 12px;
}

.work-card p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

.work-card-link {
    display: inline-block;
    margin-top: 16px;
    font-size: 0.9rem;
    font-weight: 700;
}

/* Writing Section */
.writing-list {
    max-width: 700px;
}

.writing-item {
    padding: 20px 0;
    border-bottom: 1px solid var(--color-border);
}

.writing-item:first-child {
    border-top: 1px solid var(--color-border);
}

.writing-item h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 4px;
    line-height: 1.4;
}

.writing-item h3 a {
    color: var(--color-text);
}

.writing-item h3 a:hover {
    color: var(--color-blue);
}

.writing-pub {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* About */
.about {
    background: var(--color-card-bg);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 64px;
}

.about-text p {
    color: var(--color-text-muted);
    margin-bottom: 20px;
    max-width: 580px;
}

.about-text p:first-of-type {
    font-size: 1.1rem;
    color: var(--color-text);
}

.about-sidebar h4 {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--color-text);
}

.about-sidebar ul {
    list-style: none;
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

.about-sidebar li {
    padding: 3px 0;
}

.about-sidebar section {
    padding: 0;
    margin-bottom: 28px;
}

/* Contact */
.contact {
    text-align: center;
    padding: 100px 0;
}

.contact h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.contact p {
    color: var(--color-text-muted);
    margin-bottom: 28px;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 16px;
}

.contact-links a {
    font-weight: 700;
    padding: 12px 28px;
    border: 2px solid var(--color-blue);
    border-radius: 4px;
    transition: all 0.2s ease;
}

.contact-links a:hover {
    background: var(--color-blue);
    color: white;
}

.contact-links a.primary {
    background: var(--color-orange);
    border-color: var(--color-orange);
    color: white;
}

.contact-links a.primary:hover {
    background: var(--color-orange-hover);
    border-color: var(--color-orange-hover);
}

/* Footer */
footer {
    padding: 28px 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

/* ==================== */
/* Blog Styles */
/* ==================== */

.page-header {
    padding: 140px 0 60px;
    border-bottom: 3px solid var(--color-blue);
}

.page-header h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: 12px;
}

.page-header .lead {
    font-size: 1.2rem;
    color: var(--color-text-muted);
    max-width: 600px;
}

/* Blog listing */
.blog-list {
    padding: 60px 0;
}

.post-card {
    background: var(--color-card-bg);
    border: 2px solid var(--color-border);
    border-radius: 6px;
    padding: 32px;
    margin-bottom: 24px;
    transition: all 0.2s ease;
}

.post-card:hover {
    border-color: var(--color-blue);
}

.post-card h2 {
    font-size: 1.4rem;
    margin-bottom: 8px;
}

.post-card h2 a {
    color: var(--color-text);
    transition: color 0.2s ease;
}

.post-card h2 a:hover .title-first {
    color: var(--color-blue);
}

.post-card h2 a:hover .title-second {
    color: var(--color-orange);
}

.title-first, .title-second {
    transition: color 0.2s ease;
}

.post-meta {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 16px;
}

.post-excerpt {
    color: var(--color-text-muted);
    line-height: 1.6;
}

.post-tags {
    margin-top: 16px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.post-tags a {
    font-size: 0.8rem;
    padding: 4px 10px;
    background: var(--color-bg);
    border-radius: 3px;
    color: var(--color-text-muted);
}

.post-tags a:hover {
    background: var(--color-blue);
    color: white;
}

/* Single post */
.post-header {
    padding: 140px 0 40px;
    border-bottom: 3px solid var(--color-blue);
}

.post-header .container {
    max-width: 1100px;
    margin: 0 auto;
}

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

.post-header h1 {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 16px;
}

.post-header .post-meta {
    font-size: 1rem;
}

.post-content {
    padding: 60px 24px;
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.post-content > * {
    max-width: 720px;
    width: 100%;
}

.post-content img {
    max-width: 100%;
}

.post-content p {
    margin-bottom: 1.5em;
    color: var(--color-text);
}

.post-content h2 {
    font-size: 1.5rem;
    margin-top: 2em;
    margin-bottom: 0.75em;
}

.post-content h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-top: 1.5em;
    margin-bottom: 0.5em;
}

.post-content ul, .post-content ol {
    margin-bottom: 1.5em;
    padding-left: 1.5em;
    color: var(--color-text-muted);
}

.post-content li {
    margin-bottom: 0.5em;
}

.post-content blockquote {
    border-left: 4px solid var(--color-orange);
    padding-left: 20px;
    margin: 1.5em 0;
    font-style: italic;
    color: var(--color-text-muted);
}

.post-content img {
    max-width: 100%;
    height: auto;
    border-radius: 6px;
    margin: 1.5em 0;
}

.post-content pre {
    background: var(--color-code-bg);
    color: var(--color-code-text);
    padding: 20px;
    border-radius: 6px;
    overflow-x: auto;
    margin: 1.5em 0;
    font-size: 0.9rem;
}

.post-content code {
    font-family: var(--font-display);
    font-size: 0.9em;
}

.post-content p code {
    background: var(--color-bg);
    padding: 2px 6px;
    border-radius: 3px;
}

.post-footer {
    padding: 40px 24px;
    border-top: 1px solid var(--color-border);
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
}

.post-footer .post-nav {
    max-width: 720px;
    width: 100%;
}

.post-nav {
    display: flex;
    justify-content: space-between;
    gap: 24px;
}

.post-nav a {
    font-weight: 700;
}

.post-nav .prev::before {
    content: "← ";
}

.post-nav .next::after {
    content: " →";
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: 16px;
    padding: 40px 0;
}

.pagination a, .pagination span {
    padding: 8px 16px;
    border: 2px solid var(--color-border);
    border-radius: 4px;
    font-weight: 700;
}

.pagination a:hover {
    border-color: var(--color-blue);
}

.pagination .current {
    background: var(--color-blue);
    border-color: var(--color-blue);
    color: white;
}

/* ==================== */
/* Animations */
/* ==================== */

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-content, .page-header, .post-header {
    animation: fadeUp 0.6s ease forwards;
}

.work-card, .writing-item, .featured-card, .post-card {
    animation: fadeUp 0.5s ease forwards;
    animation-play-state: paused;
}

.animate {
    animation-play-state: running;
}

/* ==================== */
/* Figures & Captions */
/* ==================== */

figure {
    margin: 24px 0;
    text-align: center;
}

figure img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
}

figcaption {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    font-style: italic;
    margin-top: 8px;
}

/* ==================== */
/* Image Gallery */
/* ==================== */

.gallery {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    margin: 24px 0;
}

.gallery a {
    display: block;
    border-radius: 4px;
    overflow: hidden;
    cursor: pointer;
}

.gallery img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.3s ease;
}

.gallery a:hover img {
    transform: scale(1.03);
}

/* Lightbox */
.lightbox {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.95);
    z-index: 9999;
    cursor: pointer;
}

.lightbox.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox img {
    max-width: 90vw;
    max-height: 90vh;
    object-fit: contain;
    cursor: default;
}

.lightbox-close {
    position: fixed;
    top: 20px;
    right: 30px;
    font-size: 40px;
    color: white;
    cursor: pointer;
    z-index: 10000;
    line-height: 1;
    font-weight: 300;
}

.lightbox-close:hover {
    color: #ccc;
}

.lightbox-nav {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    font-size: 50px;
    color: white;
    cursor: pointer;
    padding: 20px;
    z-index: 10000;
    user-select: none;
}

.lightbox-nav:hover {
    color: #ccc;
}

.lightbox-prev {
    left: 10px;
}

.lightbox-next {
    right: 10px;
}

/* ==================== */
/* Responsive */
/* ==================== */

@media (max-width: 768px) {
    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-bg);
        flex-direction: column;
        padding: 20px 24px;
        gap: 16px;
        border-bottom: 1px solid var(--color-border);
        display: none;
    }

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

    .nav-separator {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.open span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.open span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.open span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

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

    .hero-photo {
        order: -1;
        width: 140px;
        height: 140px;
        margin: 0 auto;
    }

    .hero-subtitle {
        margin: 0 auto;
    }

    .featured-card {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .featured-visual {
        order: -1;
    }

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

    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

    .post-nav {
        flex-direction: column;
    }
}