/* ==========================================================================
   Table of Contents
   ==========================================================================
   1.  CSS CUSTOM PROPERTIES (VARIABLES)
   2.  GLOBAL STYLES (RESET & BASE)
   3.  TYPOGRAPHY
   4.  REUSABLE COMPONENTS (Button, Badge, Grid, Timeline)
   5.  LAYOUT COMPONENTS (Wrapper, Sidebar, Content, Footer)
   5.  RESPONSIVE DESIGN
   7.  RESPONSIVE DESIGN
   8.  DARK MODE
   ========================================================================== */


/* ==================================================
   1. CSS CUSTOM PROPERTIES (VARIABLES)
   ================================================== */

:root {
    /* Colors */
    --color-primary: #B8724D;
    --color-primary-dark: #9A5F42;
    --color-text-primary: #000000;
    --color-text-secondary: #222222;
    --color-text-tertiary: #333333;
    --color-text-light: #555555;
    --color-text-super-light: #777777;
    --color-border-light: #f0f0f0;
    --color-border-medium: #e1e5e9;
    --color-background-code: #f8f9fa;
    --color-white: #fff;
    --color-black: #000;

    /* Sidebar Colors */
    --color-sidebar-bg: #3b3b3b;
    --color-sidebar-text: #ffffff;
    --color-sidebar-text-secondary: #cccccc;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'SF Mono', Monaco, Inconsolata, 'Roboto Mono', Consolas, monospace;
    --font-size-base: 16px;
    --font-size-small: 0.85rem;
    --font-size-large: 1.2rem;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --line-height-base: 1.6;
    --line-height-tight: 1.3;
    --line-height-loose: 1.8;

    /* Button sizing */
    --button-min-height: 36px;
    --button-padding-x: 0px;
    --button-padding-y: 10px;

    /* Spacing Scale */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 12px;
    --space-lg: 16px;
    --space-xl: 20px;
    --space-2xl: 24px;
    --space-3xl: 32px;
    --space-4xl: 40px;
    --space-5xl: 48px;
    --space-6xl: 64px;

    /* Layout */
    --content-max-width: 700px;
    --sidebar-width: 340px;
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-width: 1px;

    /* Transitions */
    --transition-fast: 0.1s ease;
    --transition-normal: 0.2s ease;
    --transition-slow: 0.3s ease;

    /* Shadows */
    --shadow-default: 2px 2px 0 var(--color-black);

    /* Z-index scale */
    --z-sidebar: 100;
    --z-modal: 1000;

    /* Breakpoints (for use in media queries) */
    --breakpoint-mobile: 480px;
    --breakpoint-tablet: 768px;
    --breakpoint-desktop: 1200px;
    --breakpoint-wide: 1600px;
}

/* ==================================================
   2. GLOBAL STYLES (RESET & BASE)
   ================================================== */

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

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    line-height: var(--line-height-base);
    color: var(--color-text-primary);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* Color utilities */
.text-primary {
    color: var(--color-text-primary);
}

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

.text-tertiary {
    color: var(--color-text-tertiary);
}

/* Visually hidden utility for accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ==================================================
   3. TYPOGRAPHY
   ================================================== */

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
    color: var(--color-text-primary);
    margin-bottom: var(--space-lg);
}

h1 {
    font-size: 2rem;
}

h2 {
    font-size: 1.6rem;
}

h3 {
    font-size: 1.4rem;
}

h4 {
    font-size: 1.2rem;
}

h5 {
    font-size: 1.1rem;
}

h6 {
    font-size: 1rem;
}

p {
    margin-bottom: var(--space-xl);
}

ul,
ol {
    margin-bottom: var(--space-xl);
    padding-left: var(--space-3xl);
}

li {
    margin-bottom: var(--space-sm);
}

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

a:hover {
    color: var(--color-primary-dark);
}

blockquote {
    border-left: 4px solid var(--color-primary);
    padding-left: var(--space-xl);
    margin: var(--space-3xl) 0;
    font-style: italic;
    color: var(--color-text-tertiary);
}

code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background-color: var(--color-background-code);
    padding: var(--space-xs) var(--space-sm);
    border: var(--border-width) solid var(--color-border-medium);
    border-radius: var(--border-radius-sm);
}

pre {
    font-family: var(--font-mono);
    background-color: var(--color-background-code);
    border: var(--border-width) solid var(--color-border-medium);
    padding: var(--space-xl);
    margin: var(--space-xl) 0;
    overflow-x: auto;
    border-radius: var(--border-radius-sm);
}

pre code {
    background-color: transparent;
    padding: 0;
    border: none;
}

/* ==================================================
   4. REUSABLE COMPONENTS
   ================================================== */

/* Button component */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-white);
    color: var(--color-black);
    padding: var(--button-padding-x) var(--button-padding-y);
    border: var(--border-width) solid var(--color-black);
    font-family: inherit;
    font-size: var(--font-size-small);
    font-weight: var(--font-weight-medium);
    text-decoration: none;
    cursor: pointer;
    transition: box-shadow var(--transition-normal);
    border-radius: 0;
    min-height: var(--button-min-height);
}

.btn:hover {
    box-shadow: var(--shadow-default);
}

/* Badge component */
.badge {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    border: var(--border-width) solid var(--color-black);
    font-size: 0.8rem;
    font-weight: var(--font-weight-medium);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge--published {
    background-color: #f0f0f0;
    color: var(--color-text-primary);
    border-color: var(--color-border-medium);
}

.badge--preprint {
    background-color: var(--color-white);
    color: var(--color-primary);
    border-color: var(--color-primary);
}

/* Grid layout */
.grid {
    display: grid;
    gap: var(--space-2xl);
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

/* Project preview card */
.project-card {
    display: flex;
    flex-direction: column;
    border: var(--border-width) solid var(--color-border-light);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    text-decoration: none;
    color: inherit;
    transition: all var(--transition-normal);
    height: 100%;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.project-card:hover {
    border-color: var(--color-primary);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.project-card-image {
    width: 100%;
    height: 100px;
    overflow: hidden;
    background-color: var(--color-border-light);
}

.project-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.project-card:hover .project-card-image img {
    transform: scale(1.05);
}

.project-card-content {
    flex: 1;
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
}

.project-card-content h4 {
    margin: 0 0 var(--space-sm) 0;
    font-size: 0.95rem;
    color: var(--color-text-primary);
}

.project-card-content p {
    margin: 0 0 var(--space-md) 0;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    flex: 1;
    line-height: var(--line-height-base);
}

.project-card-link {
    display: inline-block;
    font-size: 0.75rem;
    color: var(--color-primary);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    margin-top: auto;
}

/* Timeline component */
.timeline {
    margin: 0;
    /*var(--space-md) 0;*/
    max-width: var(--content-max-width);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--space-xs);
    /*var(--space-sm)*/
    padding-left: 80px;
    min-height: 60px;
    transition: all var(--transition-normal);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 50px;
    top: -20px;
    bottom: -20px;
    width: 2px;
    background-color: var(--color-black);
}

.timeline-item:first-child::before {
    top: 29px;
}

.timeline-item:last-child::before {
    bottom: 29px;
}

.timeline-date {
    position: absolute;
    left: -90px;
    top: 22px;
    width: 130px;
    text-align: right;
    font-weight: var(--font-weight-bold);
    color: var(--color-black);
    font-size: 1rem;
    padding-right: var(--space-sm);
}

.timeline-marker {
    position: absolute;
    left: 43px;
    top: 27px;
    width: 16px;
    height: 16px;
    background-color: var(--color-white);
    border: 2px solid var(--color-black);
    transition: box-shadow var(--transition-normal);
    z-index: 2;
}

.timeline-item:hover .timeline-marker {
    box-shadow: var(--shadow-default);
}

.timeline-content {
    padding: var(--space-xl) 0;
}

/* ==================================================
   5. LAYOUT COMPONENTS
   ================================================== */

/* Main layout wrapper */
.layout-wrapper {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--color-sidebar-bg);
    padding: 0;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    z-index: var(--z-sidebar);
    top: 0;
    left: 0;
}

.sidebar-content {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
}

.sidebar-text-content {
    padding: var(--space-4xl) var(--space-3xl);
    width: 100%;
}

/* Content container */
.content-container {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Main content area */
.main-content {
    flex: 1;
    padding: var(--space-6xl) 80px var(--space-sm);
}

/* Constrain width of direct children in main content */
.main-content>* {
    max-width: var(--content-max-width);
    width: 100%;
}

.main-content .talks-list {
    max-width: var(--content-max-width);
    width: 100%;
}

/* Footer */
.site-footer {
    padding: 0 80px var(--space-3xl);
    background-color: var(--color-white);
    margin-top: auto;
}

.footer-content {
    text-align: center;
    max-width: var(--content-max-width);
    margin: 0;
}

.footer-content p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--color-text-super-light);
    font-weight: var(--font-weight-normal);
}

.footer-content a {
    color: var(--color-text-super-light);
    text-decoration: underline;
    font-weight: var(--font-weight-normal);
}

/* ==================================================
   6. PAGE-SPECIFIC STYLES
   ================================================== */

/* Profile section */
.profile {
    margin-bottom: var(--space-xl);
    text-align: center;
    width: 100%;
    display: flex;
    justify-content: center;
}

.profile-image {
    width: 100%;
    height: 240px;
    border-radius: 0;
    overflow: hidden;
    display: block;
}

.profile-name {
    font-size: 1.3rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-sm);
    color: var(--color-sidebar-text);
    text-align: left;
}

.profile-bio {
    font-size: 0.9rem;
    color: var(--color-sidebar-text-secondary);
    line-height: 1.5;
    margin-bottom: var(--space-md);
    text-align: left;
    white-space: pre-wrap;
}

/* Social links */
.social-links {
    display: flex;
    gap: var(--space-xl);
    margin-bottom: 35px;
    flex-wrap: wrap;
    justify-content: flex-start;
}

.social-links a {
    color: var(--color-sidebar-text-secondary);
    font-size: 0.9rem;
    font-weight: var(--font-weight-normal);
    transition: color var(--transition-normal);
}

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

/* Sidebar Navigation */
.sidebar-nav {
    display: flex;
    flex-direction: column;
    width: 100%;
}

.sidebar-nav a {
    display: block;
    padding: var(--space-sm) var(--space-lg) var(--space-sm) var(--space-md);
    color: var(--color-sidebar-text-secondary);
    text-decoration: none;
    font-weight: var(--font-weight-normal);
    font-size: 0.9rem;
    text-align: left;
    border-left: 3px solid transparent;
    transition: border-left var(--transition-fast);
    background-color: transparent;
    outline: none;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
    border-left: 3px solid var(--color-sidebar-text);
    color: var(--color-sidebar-text);
    text-decoration: none;
    outline: none;
}

.sidebar-nav a.active {
    font-weight: var(--font-weight-medium);
}

/* Section styles */
.content-section {
    margin-bottom: var(--space-6xl);
}

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

.section-title {
    font-size: 1.8rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-lg);
    color: var(--color-text-primary);
}

/* Page header */
.page-header {
    margin-bottom: var(--space-5xl);
}

.page-title {
    font-size: 2.2rem;
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    margin-bottom: var(--space-xl);
    color: var(--color-text-primary);
}

.page-subtitle {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    line-height: var(--line-height-base);
    margin-bottom: 0;
}

/* CV and Teaching institution styles */
.cv-institution,
.cv-institution a,
.teaching-institution,
.teaching-institution a {
    font-size: 1rem;
    color: var(--color-text-light);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--space-md);
    transition: color var(--transition-normal);
}

.cv-institution a:hover,
.teaching-institution a:hover {
    color: var(--color-text-secondary);
}

.cv-details p {
    margin-bottom: var(--space-sm);
    color: var(--color-text-tertiary);
    line-height: 1.5;
}

.cv-details strong {
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
}

/* CV Detail Collapsible Styles */
.cv-detail-item {
    margin-bottom: var(--space-md);
}

.cv-detail-wrapper {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    gap: var(--space-sm);
}

.cv-detail-text {
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin: 0;
    color: var(--color-text-tertiary);
    line-height: 1.5;
}

.cv-detail-text strong {
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
}

.cv-detail-text.expanded {
    display: block;
    -webkit-line-clamp: unset;
    line-clamp: unset;
    flex: 0 0 100%;
    margin-bottom: var(--space-sm);
}

.cv-detail-text.expanded~.cv-detail-toggle {
    flex: 0 0 auto;
    margin-top: var(--space-sm);
}

.cv-detail-text {
    flex: 0 0 100%;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin: 0;
    color: var(--color-text-tertiary);
    line-height: 1.5;
}

.cv-detail-text.expanded {
    display: block;
    -webkit-line-clamp: unset;
    line-clamp: unset;
    flex: 0 0 100%;
    margin-bottom: var(--space-xs);
}

.cv-detail-text.expanded~.cv-detail-toggle {
    flex: 0 0 auto;
    margin-top: 0;
}

.cv-detail-toggle {
    background: none;
    border: none;
    color: var(--color-text-light);
    cursor: pointer;
    padding: 0;
    font-size: 0.75rem;
    font-weight: var(--font-weight-normal);
    text-decoration: underline;
    transition: opacity var(--transition-normal);
    display: none;
    white-space: nowrap;
}

.cv-detail-toggle.visible {
    display: inline;
}

.cv-detail-toggle:hover {
    opacity: 0.7;
}

/* Teaching section */
.teaching-item {
    margin-bottom: var(--space-4xl);
    padding-bottom: 0;
    border-bottom: var(--border-width) solid var(--color-border-light);
}

.teaching-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.teaching-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-sm);
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.teaching-header h3 {
    margin: 0;
    font-size: 1.3rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

.teaching-period {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
    white-space: nowrap;
}

/* Research paper styles */
.paper-meta {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
    flex-wrap: wrap;
    margin-bottom: var(--space-md);
}

.paper-journal {
    color: var(--color-text-secondary);
    font-style: italic;
}

.paper-toggle {
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    width: 100%;
    text-align: left;
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    font-family: inherit;
    color: inherit;
    transition: opacity var(--transition-normal);
}

.paper-toggle:hover {
    opacity: 0.7;
}

.paper-toggle-icon {
    display: inline-block;
    width: 24px;
    min-width: 24px;
    height: 24px;
    transition: transform var(--transition-normal);
    font-size: 0.75rem;
    line-height: 24px;
    text-align: center;
}

.paper-toggle[aria-expanded="true"] .paper-toggle-icon {
    transform: rotate(90deg);
}

.paper-header {
    flex: 1;
    min-width: 0;
}

.paper-header h3 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

.paper-details {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows var(--transition-normal);
    overflow: hidden;
}

.paper-toggle[aria-expanded="true"]+.paper-details {
    grid-template-rows: 1fr;
}

.paper-details>* {
    min-height: 0;
    overflow: hidden;
}

.paper-authors {
    font-size: 0.875rem;
    margin-bottom: var(--space-sm);
    color: var(--color-text-secondary);
    padding-top: var(--space-xs);
}

.paper-abstract,
.paper-abstract-award {
    color: var(--color-text-tertiary);
    line-height: var(--line-height-base);
    font-size: 0.875rem;
}

.paper-abstract-award {
    margin-bottom: var(--space-md);
}

.paper-abstract-container {
    margin-bottom: var(--space-md);
}

.paper-abstract-wrapper {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    gap: var(--space-sm);
}

.paper-abstract-collapsed {
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin: 0;
    max-width: 100%;
    word-wrap: break-word;
    line-height: 1.5;
    max-height: 3em;
}

.paper-abstract-collapsed.expanded {
    display: block !important;
    -webkit-box: none !important;
    -webkit-line-clamp: none !important;
    line-clamp: none !important;
    -webkit-box-orient: unset !important;
    overflow: visible !important;
    flex: 100%;
    margin-bottom: var(--space-sm);
    white-space: normal !important;
    max-height: none !important;
    height: auto !important;
}

.paper-abstract-collapsed.expanded~.abstract-toggle {
    flex: 100%;
    margin-top: var(--space-sm);
}

.abstract-toggle {
    background: none;
    border: none;
    color: var(--color-text-light);
    cursor: pointer;
    padding: 0;
    font-size: 0.75rem;
    font-weight: var(--font-weight-normal);
    text-decoration: underline;
    transition: opacity var(--transition-normal);
    display: inline;
    white-space: nowrap;
}

.abstract-toggle:hover {
    opacity: 0.7;
}

.abstract-toggle.hidden {
    display: none;
}

/* Generic List styles */
.list-item {
    margin-bottom: var(--space-4xl);
    padding-bottom: var(--space-3xl);
    border-bottom: var(--border-width) solid var(--color-border-light);
}

.list-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.list-title {
    font-size: 1.4rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-sm);
}

.list-title a {
    color: var(--color-text-primary);
}

.list-title a:hover {
    color: var(--color-text-secondary);
}

.list-meta {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
}

.list-description {
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-lg);
}

/* Shared link container for papers and lists */
.paper-links,
.list-links {
    padding-top: var(--space-xs);
    margin-bottom: var(--space-lg);
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    justify-content: flex-start;
    align-items: center;
}

/* Talk video styles */
.talk-video {
    margin: var(--space-lg) 0;
    max-width: 45%;
}

.talk-video iframe {
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
}

/* Last updated */
.last-updated {
    color: var(--color-text-super-light);
    font-size: 0.875rem;
    text-align: center;
}

/* ==================================================
   7. RESPONSIVE DESIGN
   ================================================== */

/* Center layout on very wide screens */
@media (min-width: 1401px) {
    .layout-wrapper {
        max-width: calc(var(--sidebar-width) + var(--content-max-width) + 160px);
        margin: 0 auto;
    }

    .sidebar {
        left: 50%;
        transform: translateX(calc(-50vw + 50%));
    }
}

/* Tablet and mobile (1200px and below) */
@media (max-width: 1200px) {
    .layout-wrapper {
        flex-direction: column;
        max-width: calc(var(--content-max-width) + 160px);
        margin: 0 auto;
    }

    .content-container {
        margin-left: 0;
    }

    /* Sidebar becomes horizontal header */
    .sidebar {
        position: static;
        width: 100%;
        height: auto;
        padding: var(--space-xl);
        max-width: calc(var(--content-max-width) + 38px);
        margin: 0 auto;
    }

    .sidebar-content {
        max-width: var(--content-max-width);
        margin: 0;
        /* Changed from margin: 0 left */
    }

    .profile-image {
        width: 340px;
        height: 240px;
    }

    .profile-name {
        font-size: 1.2rem;
        text-align: center;
    }

    .profile-bio {
        font-size: var(--font-size-small);
        max-width: 320px;
        text-align: center;
        margin-left: auto;
        margin-right: auto;
    }

    .social-links {
        margin-bottom: 25px;
        gap: var(--space-md);
        justify-content: center;
    }

    /* Main content adjustments */
    .main-content {
        max-width: var(--content-max-width);
        margin: 0 auto;
        padding: var(--space-3xl) 0;
    }

    .site-footer {
        padding: var(--space-sm);
        margin-top: 0;
    }

    .page-title {
        font-size: 1.8rem;
    }

    /* Timeline adjustments for mobile */
    .timeline {
        padding-left: 0;
        margin: var(--space-4xl) 0;
    }

    .timeline-item {
        padding-left: 0;
    }

    .timeline-item::before,
    .timeline-marker {
        display: none;
    }

    .timeline-date {
        position: static;
        width: auto;
        text-align: left;
        margin-bottom: var(--space-md);
        font-size: 0.9rem;
        font-weight: var(--font-weight-semibold);
        padding-right: 0;
    }

    .timeline-content {
        padding: var(--space-md);
        border-left: 2px solid var(--color-black);
    }

    .teaching-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-xs);
    }
}

/* Small tablets (768px and below) */
@media (max-width: 768px) {
    .main-content {
        padding: var(--space-2xl) var(--space-lg);
    }

    .sidebar {
        padding: var(--space-lg);
    }

    .profile-image {
        width: 48.5%;
        height: auto;
        aspect-ratio: 340 / 240;
    }

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

    .page-title {
        font-size: 1.6rem;
    }

    .btn {
        padding: var(--space-sm) var(--space-lg);
        font-size: 0.9rem;
        min-height: 40px;
    }

    .profile-name {
        font-size: 1.2rem;
    }

    .profile-bio {
        font-size: var(--font-size-small);
        max-width: 320px;
    }
}

/* Mobile phones (480px and below) */
@media (max-width: 480px) {
    .main-content {
        padding: var(--space-xl) var(--space-md);
    }

    .site-footer,
    .sidebar {
        padding: var(--space-md);
    }

    .page-title {
        font-size: 1.4rem;
    }

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

    .btn {
        font-size: 16px;
        /* Prevent zoom on iOS */
        min-height: 44px;
        /* iOS touch target */
    }

    .profile-image {
        width: 48.5%;
        height: auto;
        aspect-ratio: 340 / 240;
    }

    /* Ensure abstracts are properly truncated on mobile */
    .paper-abstract-collapsed {
        display: -webkit-box !important;
        -webkit-line-clamp: 2 !important;
        line-clamp: 2 !important;
        -webkit-box-orient: vertical !important;
        overflow: hidden !important;
        max-width: 100%;
        max-height: 3em !important;
        line-height: 1.5 !important;
    }

    /* Allow abstracts to expand fully on mobile */
    .paper-abstract-collapsed.expanded {
        display: block !important;
        -webkit-box: none !important;
        -webkit-line-clamp: none !important;
        line-clamp: none !important;
        -webkit-box-orient: unset !important;
        overflow: visible !important;
        white-space: normal !important;
        max-height: none !important;
        height: auto !important;
    }

    /* Hide decorative timeline elements on small screens */
    .timeline-marker,
    .timeline-item::before {
        display: none !important;
        /* Keep important if needed to override inline styles or JS */
    }
}

/* Extra small screens (320px and below) */
@media (max-width: 320px) {

    .main-content,
    .sidebar {
        padding: var(--space-lg) var(--space-sm);
    }

    .page-title {
        font-size: 1.3rem;
    }

    .btn {
        padding: var(--space-xs) var(--space-md);
        font-size: 14px;
        min-height: 40px;
    }

    .profile-bio {
        max-width: 100%;
        font-size: 0.8rem;
    }

    .profile-image {
        width: 48.5%;
        height: auto;
        aspect-ratio: 340 / 240;
    }

}

/* ==================================================
   8. DARK MODE
   ================================================== */

@media (prefers-color-scheme: dark) {
    :root {
        --color-text-primary: #e5e5e5;
        --color-text-secondary: #a3a3a3;
        --color-text-tertiary: #d4d4d4;
        --color-text-light: #737373;
        --color-white: #1a1a1a;
        --color-black: #e5e5e5;
        --color-border-light: #404040;
        --color-border-medium: #525252;
        --color-background-code: #262626;
    }

    .timeline-marker {
        background-color: var(--color-white);
    }

    .badge--published {
        background-color: #333333;
        border-color: var(--color-border-medium);
    }

    .badge--preprint {
        background-color: var(--color-white);
        color: var(--color-primary);
        border-color: var(--color-primary);
    }
}