/* CSS Variables for theming */
:root {
    --bg-primary: #fdfcf9;
    --bg-secondary: #f5f3ed;
    --text-primary: #1a1814;
    --text-secondary: #6b6558;
    --accent: #1a7c06;
    --border: #e5e2d8;
    --shadow: rgba(0, 0, 0, 0.06);
}

[data-theme="dark"] {
    --bg-primary: #0f0e0d;
    --bg-secondary: #1a1816;
    --text-primary: #f5f3ed;
    --text-secondary: #a8a399;
    --accent: #1a7c06;
    --border: #2d2b27;
    --shadow: rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: 'Work Sans', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    transition: background-color 0.4s ease, color 0.4s ease;
}

/* Layout */
.container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 60px 24px;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 80px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
}

/* Navigation */
nav {
    display: flex;
    gap: 32px;
    align-items: center;
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    font-weight: 400;
    letter-spacing: 0.3px;
    transition: color 0.3s ease;
    position: relative;
}

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

nav a.active {
    color: var(--text-primary);
    font-weight: 500;
}

nav a.active::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 100%;
    height: 1px;
    background-color: var(--accent);
}

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: 1px solid var(--border);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    color: var(--text-primary);
}

.theme-toggle:hover {
    border-color: var(--accent);
    background-color: var(--bg-secondary);
}

/* Page transitions */
.page {
    display: none;
    opacity: 0;
    animation: fadeIn 0.5s ease forwards;
}

.page.active {
    display: block;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

/* Profile Section */
.profile-section {
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: 40px;
    margin-bottom: 60px;
    align-items: start;
}

.profile-image {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    background-color: var(--bg-secondary);
    border: 3px solid var(--border);
    object-fit: cover;
    transition: transform 0.4s ease;
}

.profile-image:hover {
    transform: scale(1.05);
}

/* Typography */
h1 {
    font-family: 'Libre Baskerville', serif;
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
    line-height: 1.2;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 18px;
    margin-bottom: 32px;
    font-weight: 300;
}

.page-title {
    font-family: 'Libre Baskerville', serif;
    font-size: 36px;
    margin-bottom: 48px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

/* Interests Section */
.interests {
    background-color: var(--bg-secondary);
    padding: 32px;
    border-radius: 2px;
    border-left: 3px solid var(--accent);
    margin-bottom: 40px;
}

.interests h2 {
    font-family: 'Libre Baskerville', serif;
    font-size: 20px;
    margin-bottom: 16px;
    font-weight: 700;
}

.interests p {
    color: var(--text-secondary);
    font-size: 16px;
    line-height: 1.8;
}

/* Contact Section */
.contact-section {
    background-color: var(--bg-secondary);
    padding: 32px;
    border-radius: 2px;
    border-left: 3px solid var(--accent);
}

.contact-section h2 {
    font-family: 'Libre Baskerville', serif;
    font-size: 20px;
    margin-bottom: 20px;
    font-weight: 700;
}

.contact-info {
    display: grid;
    gap: 12px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 15px;
}

.contact-label {
    font-weight: 500;
    color: var(--text-primary);
    min-width: 80px;
}

.contact-item span {
    color: var(--text-secondary);
}

.contact-item a {
    color: var(--accent);
    text-decoration: none;
    transition: opacity 0.3s ease;
}

.contact-item a:hover {
    opacity: 0.7;
}

/* Publications */
.publication-item {
    margin-bottom: 36px;
    padding-bottom: 36px;
    border-bottom: 1px solid var(--border);
}

.publication-item:last-child {
    border-bottom: none;
}

.pub-title {
    font-size: 18px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-primary);
    line-height: 1.4;
}

.pub-authors {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 6px;
    font-style: italic;
}

.pub-venue {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.pub-abstract {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 12px;
    padding: 12px;
    background-color: var(--bg-secondary);
    border-radius: 2px;
}

.pub-links a {
    display: inline-block;
    margin-right: 16px;
    color: var(--accent);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: opacity 0.3s ease;
}

.pub-links a:hover {
    opacity: 0.7;
}

/* Teaching */
.teaching-item {
    margin-bottom: 36px;
    padding-bottom: 36px;
    border-bottom: 1px solid var(--border);
}

.teaching-item:last-child {
    border-bottom: none;
}

.teaching-title {
    font-size: 20px;
    font-weight: 500;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.teaching-description {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.7;
    margin-bottom: 8px;
}

.teaching-year {
    font-size: 14px;
    color: var(--accent);
    font-weight: 500;
}

/* =============================================
   BLOG STYLES
   ============================================= */

/* Blog index — card list */
.blog-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.blog-card {
    padding: 32px 0;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    transition: opacity 0.25s ease;
}

.blog-card:first-child {
    border-top: 1px solid var(--border);
}

.blog-card:hover {
    opacity: 0.75;
}

.blog-card-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 12px;
}

.blog-tag {
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--accent);
    border: 1px solid var(--accent);
    padding: 2px 8px;
    border-radius: 2px;
}

.blog-date {
    font-size: 13px;
    color: var(--text-secondary);
}

.blog-card-title {
    font-family: 'Libre Baskerville', serif;
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
    line-height: 1.35;
    letter-spacing: -0.3px;
}

.blog-card-excerpt {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.75;
    margin-bottom: 16px;
    max-width: 680px;
}

.blog-read-more {
    font-size: 14px;
    color: var(--accent);
    font-weight: 500;
}

/* Blog post view */
.blog-post {
    max-width: 720px;
}

.blog-back-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-family: 'Work Sans', sans-serif;
    font-size: 14px;
    cursor: pointer;
    padding: 0;
    margin-bottom: 48px;
    transition: color 0.25s ease;
    display: block;
}

.blog-back-btn:hover {
    color: var(--accent);
}

.blog-post-header {
    margin-bottom: 56px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--border);
}

.blog-post-title {
    font-family: 'Libre Baskerville', serif;
    font-size: 36px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    letter-spacing: -0.5px;
    line-height: 1.25;
    margin-top: 16px;
}

.blog-post-subtitle {
    font-size: 17px;
    color: var(--text-secondary);
    font-style: italic;
    line-height: 1.6;
}

/* Blog post body typography */
.blog-post-body {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-primary);
}

.blog-post-body p {
    margin-bottom: 24px;
}

.blog-post-body h2 {
    font-family: 'Libre Baskerville', serif;
    font-size: 24px;
    font-weight: 700;
    margin-top: 56px;
    margin-bottom: 20px;
    letter-spacing: -0.3px;
    color: var(--text-primary);
}

.blog-post-body h3 {
    font-family: 'Libre Baskerville', serif;
    font-size: 19px;
    font-weight: 700;
    margin-top: 40px;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.blog-post-body em {
    font-style: italic;
}

.blog-post-body strong {
    font-weight: 500;
    color: var(--text-primary);
}

/* Blog lists */
.blog-list {
    padding-left: 20px;
    margin-bottom: 24px;
}

.blog-post-body ul.blog-list {
    list-style: none;
    padding-left: 0;
}

.blog-post-body ul.blog-list li {
    padding-left: 20px;
    position: relative;
    margin-bottom: 10px;
    color: var(--text-secondary);
    font-size: 15px;
}

.blog-post-body ul.blog-list li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: 400;
}

/* Callout boxes */
.blog-callout {
    padding: 24px 28px;
    border-radius: 2px;
    margin: 32px 0;
}

.blog-callout p {
    margin-bottom: 0;
    font-size: 15px;
    line-height: 1.75;
}

.blog-callout-neutral {
    background-color: var(--bg-secondary);
    border-left: 3px solid var(--accent);
}

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

.blog-callout-technical {
    background-color: var(--bg-secondary);
    border-left: 3px solid var(--border);
}

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

.blog-callout-label {
    font-size: 11px !important;
    font-weight: 500 !important;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--text-secondary) !important;
    margin-bottom: 10px !important;
}

/* Video placeholders */
.blog-videos {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    margin: 32px 0 40px;
}

.blog-video-block {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.video-placeholder {
    background-color: var(--bg-secondary);
    border: 1px dashed var(--border);
    border-radius: 2px;
    padding: 48px 24px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
    font-style: italic;
}

.video-caption {
    font-size: 13px;
    color: var(--text-secondary);
    text-align: center;
}

/* Paper link block */
.blog-paper-link {
    margin-top: 56px;
    padding-top: 40px;
    border-top: 1px solid var(--border);
}

.blog-paper-link-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    background-color: var(--bg-secondary);
    border-left: 3px solid var(--accent);
    padding: 24px 28px;
    border-radius: 2px;
}

.blog-paper-link-title {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.blog-paper-link-venue {
    font-size: 13px;
    color: var(--text-secondary);
    font-style: italic;
}

.blog-paper-link-actions {
    display: flex;
    gap: 12px;
    flex-shrink: 0;
}

.blog-paper-btn {
    display: inline-block;
    font-size: 14px;
    font-weight: 500;
    color: var(--accent);
    text-decoration: none;
    transition: opacity 0.25s ease;
    white-space: nowrap;
}

.blog-paper-btn:hover {
    opacity: 0.7;
}

.blog-paper-btn-secondary {
    color: var(--text-secondary);
}

/* =============================================
   RESPONSIVE DESIGN
   ============================================= */

/* Tablets and small laptops */
@media (max-width: 768px) {
    .container {
        padding: 50px 20px;
    }

    header {
        margin-bottom: 60px;
    }

    nav {
        gap: 24px;
    }

    nav a {
        font-size: 14px;
    }

    .profile-section {
        gap: 32px;
    }

    h1 {
        font-size: 36px;
    }

    .interests {
        padding: 28px;
    }

    .pub-title,
    .teaching-title {
        font-size: 17px;
    }

    .blog-paper-link-inner {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* Mobile devices */
@media (max-width: 640px) {
    .container {
        padding: 40px 20px;
    }

    header {
        flex-direction: column;
        align-items: flex-start;
        gap: 20px;
        margin-bottom: 50px;
    }

    nav {
        width: 100%;
        justify-content: flex-start;
        gap: 20px;
        flex-wrap: wrap;
    }

    nav a {
        font-size: 15px;
    }

    .theme-toggle {
        position: absolute;
        top: 60px;
        right: 20px;
    }

    .profile-section {
        grid-template-columns: 1fr;
        gap: 24px;
        text-align: center;
        margin-bottom: 50px;
    }

    .profile-image {
        margin: 0 auto;
        width: 120px;
        height: 120px;
    }

    h1 {
        font-size: 32px;
    }

    .subtitle {
        font-size: 16px;
    }

    .page-title {
        font-size: 28px;
        margin-bottom: 36px;
    }

    .interests {
        padding: 24px;
    }

    .interests h2 {
        font-size: 18px;
    }

    .interests p {
        font-size: 15px;
    }

    .contact-section {
        padding: 24px;
    }

    .contact-section h2 {
        font-size: 18px;
    }

    .contact-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }

    .contact-label {
        font-size: 14px;
    }

    .contact-item a,
    .contact-item span {
        font-size: 14px;
    }

    .publication-item,
    .teaching-item {
        margin-bottom: 28px;
        padding-bottom: 28px;
    }

    .pub-title {
        font-size: 16px;
    }

    .pub-authors {
        font-size: 14px;
    }

    .pub-venue {
        font-size: 13px;
    }

    .pub-abstract {
        font-size: 13px;
        padding: 10px;
    }

    .pub-links a {
        font-size: 13px;
        margin-right: 12px;
    }

    .teaching-title {
        font-size: 18px;
    }

    .teaching-description {
        font-size: 14px;
    }

    .teaching-year {
        font-size: 13px;
    }

    /* Blog mobile */
    .blog-post-title {
        font-size: 26px;
    }

    .blog-card-title {
        font-size: 18px;
    }

    .blog-post-body h2 {
        font-size: 20px;
    }

    .blog-callout {
        padding: 20px;
    }

    .blog-paper-link-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .blog-paper-link-actions {
        flex-direction: column;
        gap: 8px;
    }
}

/* Very small mobile devices */
@media (max-width: 375px) {
    .container {
        padding: 30px 16px;
    }

    h1 {
        font-size: 28px;
    }

    .page-title {
        font-size: 24px;
    }

    nav {
        gap: 16px;
    }

    nav a {
        font-size: 14px;
    }

    .profile-image {
        width: 100px;
        height: 100px;
    }

    .interests {
        padding: 20px;
    }
}

/* Large screens - ensure content doesn't get too wide */
@media (min-width: 1200px) {
    .container {
        max-width: 1080px;
    }
}