/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 15px;
    line-height: 1.6;
    color: #1a1a1a;
    background-color: #ffffff;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    line-height: 1.2;
    font-weight: 600;
    margin-bottom: 1rem;
}

h1 {
    font-size: 2.2rem;
    font-weight: 700;
}

h2 {
    font-size: 1.8rem;
}

h3 {
    font-size: 1.3rem;
}

p {
    margin-bottom: 1rem;
}

a {
    color: #0D4F3C;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

ul {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

li {
    margin-bottom: 0.5rem;
}

/* Layout */
.content-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: white;
    border-bottom: 1px solid #e5e5e5;
    z-index: 1000;
    height: 64px;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    height: 64px;
    position: relative;
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1a1a1a;
    text-decoration: none;
    flex-shrink: 0;
}

.nav-brand:hover {
    text-decoration: none;
    color: #0D4F3C;
}

.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    gap: 1.5rem;
    position: absolute;
    left: 65%;
    transform: translateX(-50%);
    white-space: nowrap;
    flex-wrap: nowrap;
}

.nav-link {
    color: #1a1a1a;
    font-weight: 500;
    padding: 0.5rem 0;
    transition: color 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
    color: #0D4F3C;
    text-decoration: none;
}

.nav-actions {
    display: flex;
    gap: 0.5rem;
}

.nav-action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    border-radius: 6px;
    color: #666;
    cursor: pointer;
    transition: all 0.2s ease;
}

.nav-action-btn:hover {
    background-color: #f5f5f5;
    color: #1a1a1a;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle-bar {
    width: 24px;
    height: 2px;
    background-color: #1a1a1a;
    margin: 3px 0;
    transition: 0.3s;
}

/* Main Content */
.main-content {
    background-color: #0D4F3C;
    min-height: 100vh;
    padding-top: 64px;
}

.content-container {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 1.5rem;
    padding: 4rem 2rem;
    align-items: start;
    min-height: calc(100vh - 64px);
    justify-content: center;
}

/* Move the main section down slightly */
.main-section {
    color: white;
    margin-top: 3rem;
}

/* Simple single-column layout */
.simple-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

.profile-center {
    text-align: center;
    color: white;
}

/* Profile Sidebar */
.profile-sidebar {
    text-align: center;
    color: white;
    padding-top: 2rem;
}

.profile-image-container {
    position: relative;
    display: flex;
    justify-content: center;
    margin-bottom: 1rem;
}

.profile-image {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid rgba(255, 255, 255, 0.2);
    background-color: #2a6f5c;
    background-image: linear-gradient(45deg, #2a6f5c 25%, transparent 25%),
        linear-gradient(-45deg, #2a6f5c 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #2a6f5c 75%),
        linear-gradient(-45deg, transparent 75%, #2a6f5c 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

.profile-audio-icon {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background-color: rgba(0, 0, 0, 0.7);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.profile-audio-icon:hover {
    background-color: rgba(0, 0, 0, 0.9);
    transform: scale(1.1);
}

.profile-audio-icon svg {
    color: white;
}

.profile-info {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.name-section {
    margin-bottom: 0.5rem;
}

.profile-name {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    color: white;
}

.profile-name-chinese {
    font-size: 1.5rem;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 0;
}

.profile-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 0.25rem;
}

.profile-affiliation {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 0.75rem;
}

.profile-links {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.contact-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 6px;
    color: rgba(255, 255, 255, 0.8);
    transition: all 0.2s ease;
}

.contact-link:hover {
    color: white;
    background-color: rgba(255, 255, 255, 0.1);
    text-decoration: none;
    transform: translateY(-2px);
}

/* This section is now handled above with margin-top */

/* Contact Section */
.contact-section {
    margin-top: 2rem;
}

.contact-title {
    font-size: 1.7rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: white;
    text-align: center;
}

/* Separator line before contact section */
.content-area:has(.contact-title)::before {
    content: "";
    display: block;
    width: 100%;
    height: 1px;
    background-color: rgba(255, 255, 255, 0.3);
    margin: 2rem 0 1.5rem 0;
}



.contact-section-top {
    margin-bottom: 1rem;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.contact-icon-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    color: rgba(255, 255, 255, 0.9);
    transition: all 0.2s ease;
    backdrop-filter: blur(10px);
}

.contact-icon-link:hover {
    background-color: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.4);
    color: white;
    text-decoration: none;
    transform: translateY(-2px);
}

.contact-icon-link svg {
    width: 28px;
    height: 28px;
}

.content-area {
    margin-bottom: 1.5rem;
}

.content-title {
    font-size: 2.2rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: white;
}

.content-description {
    font-size: 1rem;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.9);
    max-width: none;
    margin-bottom: 1rem;
    padding-right: 2rem;
}

.cv-download-btn {
    display: inline-flex;
    align-items: center;
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    padding: 12px 24px;
    border-radius: 6px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    font-weight: 500;
    transition: all 0.2s ease;
    backdrop-filter: blur(10px);
}

.cv-download-btn:hover {
    background-color: rgba(255, 255, 255, 0.2);
    border-color: white;
    text-decoration: none;
    color: white;
    transform: translateY(-2px);
}

.info-sections {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.interests-section h3,
.education-section h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: white;
}

.interests-section ul {
    list-style: none;
    margin-left: 0;
}

.interests-section li {
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 0.75rem;
    position: relative;
    padding-left: 1.5rem;
}

.interests-section li:before {
    content: "•";
    color: rgba(255, 255, 255, 0.6);
    position: absolute;
    left: 0;
}

.education-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.education-icon {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.education-icon svg {
    color: rgba(255, 255, 255, 0.8);
}

.education-content {
    flex: 1;
}

.education-degree {
    font-weight: 600;
    color: white;
    margin-bottom: 0.25rem;
}

.education-school {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.95rem;
}

/* Page Content (for individual pages) */
.page-content {
    padding-top: 64px;
    min-height: 100vh;
    background-color: #f8f9fa;
}

.page-header {
    background-color: white;
    border-bottom: 1px solid #e5e5e5;
    padding: 3rem 0;
}

.page-title {
    font-size: 3rem;
    font-weight: 700;
    color: #1a1a1a;
    text-align: center;
}

.page-body {
    padding: 3rem 0;
}

/* Content styles for individual pages */
.bio-content,
.publications-content,
.presentations-content,
.news-content,
.experience-content,
.projects-content,
.teaching-content {
    max-width: 900px;
    margin: 0 auto;
    background-color: white;
    padding: 3rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.bio-content h2 {
    font-size: 2rem;
    margin-top: 2rem;
    margin-bottom: 1.5rem;
    color: #1a1a1a;
}

.bio-content h3 {
    font-size: 1.5rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: #1a1a1a;
}

.interests-list {
    margin-left: 0;
    list-style: none;
}

.interests-list li {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    position: relative;
}

.interests-list li:before {
    content: "▸";
    color: #0D4F3C;
    position: absolute;
    left: 0;
    font-weight: bold;
}

.service-section,
.awards-section {
    margin-top: 2rem;
}

.award-item {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: 2rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid #f0f0f0;
}

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

.award-year {
    font-weight: 600;
    color: #0D4F3C;
    text-align: right;
}

.award-details h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: #1a1a1a;
}

/* Publication Items */
.publication-item,
.presentation-item,
.teaching-item,
.experience-item {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid #f0f0f0;
}

/* For publications page, restore grid layout with dates */
.publications-content .publication-item {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: 2rem;
}

.publication-item:last-child,
.presentation-item:last-child,
.teaching-item:last-child,
.experience-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.publication-year,
.presentation-year,
.teaching-year,
.experience-year {
    font-weight: 600;
    color: #0D4F3C;
    text-align: right;
}

.publication-title,
.presentation-title,
.teaching-course,
.experience-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #1a1a1a;
}

.publication-authors,
.publication-venue,
.presentation-event,
.presentation-location,
.teaching-role,
.teaching-institution,
.teaching-description,
.experience-organization,
.experience-location {
    color: #666;
    margin-bottom: 0.5rem;
}

.publication-links,
.presentation-links,
.project-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.pub-link {
    color: #0D4F3C;
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid #0D4F3C;
    padding: 4px 12px;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.pub-link:hover {
    background-color: #0D4F3C;
    color: white;
    text-decoration: none;
}

.experience-description {
    margin: 1rem 0 0 0;
}

.experience-description li {
    margin-bottom: 0.25rem;
}

/* Publication Sections */
.publication-section {
    margin-bottom: 3rem;
}

.section-title {
    font-size: 1.75rem;
    font-weight: 600;
    color: #0D4F3C;
    margin-bottom: 2rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #0D4F3C;
}

/* Abstract functionality */
.clickable-title {
    cursor: pointer;
    transition: color 0.2s ease;
}

.clickable-title:hover {
    color: #0D4F3C;
}

.click-hint {
    font-size: 0.8rem;
    font-weight: 400;
    color: #888;
    font-style: italic;
    opacity: 0.7;
    transition: opacity 0.2s ease;
}

.clickable-title:hover .click-hint {
    opacity: 1;
    color: #0D4F3C;
}

.abstract-btn {
    background: none;
    border: 1px solid #0D4F3C;
    color: #0D4F3C;
    font-size: 0.875rem;
    font-weight: 500;
    padding: 4px 12px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.abstract-btn:hover {
    background-color: #0D4F3C;
    color: white;
}

.abstract-container {
    display: none;
    margin-top: 1rem;
    padding: 1rem;
    background-color: #f8f9fa;
    border: 1px solid #e5e5e5;
    border-radius: 6px;
    animation: slideDown 0.3s ease-out;
}

.abstract-container.active {
    display: block;
}

.abstract-content {
    color: #555;
    line-height: 1.6;
}

.abstract-content p {
    margin-bottom: 0.5rem;
}

.abstract-content strong {
    color: #1a1a1a;
}

.teaching-highlight {
    font-size: 1.05rem;
    color: #333;
}

.teaching-highlight-secondary {
    font-size: 1.05rem;
    color: #333;
    margin-top: 1rem;
}

.teaching-tabs {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
    margin: 1.75rem 0 2rem;
}

.teaching-tab {
    display: block;
    width: 100%;
    text-align: left;
    padding: 1.1rem 1.25rem;
    border: 1px solid #d8e8e2;
    border-radius: 10px;
    background-color: #f7fbf9;
    cursor: pointer;
    transition: transform 0.15s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.teaching-tab:hover {
    transform: translateY(-2px);
    border-color: #0D4F3C;
    background-color: #eef7f2;
}

.teaching-tab.active {
    border-color: #0D4F3C;
    background-color: #eef7f2;
    box-shadow: inset 0 0 0 1px rgba(13, 79, 60, 0.08);
}

.teaching-tab-label {
    display: block;
    font-weight: 600;
    color: #0D4F3C;
    margin-bottom: 0.35rem;
}

.teaching-tab-text {
    display: block;
    color: #555;
    line-height: 1.5;
}

.teaching-panels {
    margin-top: 1rem;
}

.teaching-panel {
    display: none;
}

.teaching-panel.active {
    display: block;
}

.supervision-section {
    padding: 1.5rem;
    border: 1px solid #d8e8e2;
    border-radius: 10px;
    background: linear-gradient(180deg, #f7fbf9 0%, #ffffff 100%);
}

.supervision-title {
    font-size: 1.3rem;
    color: #0D4F3C;
    margin-bottom: 0.5rem;
}

.supervision-intro {
    color: #666;
    margin-bottom: 1.25rem;
}

.supervision-projects {
    display: grid;
    gap: 1rem;
}

.supervision-project-item {
    padding: 1rem 1.25rem;
    border: 1px solid #e8eceb;
    border-radius: 8px;
    background-color: #ffffff;
}

.supervision-project-title {
    font-size: 1.05rem;
    font-weight: 600;
    margin: 0;
    color: #1a1a1a;
}

/* Disabled link styling */
.pub-link.disabled {
    color: #999;
    border-color: #ccc;
    cursor: not-allowed;
    background-color: #f5f5f5;
}

.pub-link.disabled:hover {
    background-color: #f5f5f5;
    color: #999;
    transform: none;
}

/* Animation for abstract reveal */
@keyframes slideDown {
    from {
        opacity: 0;
        max-height: 0;
        margin-top: 0;
        padding-top: 0;
        padding-bottom: 0;
    }

    to {
        opacity: 1;
        max-height: 500px;
        margin-top: 1rem;
        padding-top: 1rem;
        padding-bottom: 1rem;
    }
}

/* Project Items */
.project-item {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid #f0f0f0;
}

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

.project-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #1a1a1a;
}

.project-description {
    color: #666;
    margin-bottom: 1rem;
}

/* Intro note for agentic apps */
.intro-note {
    background-color: #f8f9fa;
    border-left: 4px solid #0D4F3C;
    padding: 1rem 1.5rem;
    margin-bottom: 2rem;
    border-radius: 0 6px 6px 0;
}

.intro-note p {
    margin: 0;
    color: #555;
    font-style: italic;
}

/* News Items */
.news-item {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 2rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid #f0f0f0;
}

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

.news-date {
    font-weight: 600;
    color: #0D4F3C;
    font-size: 0.875rem;
    text-align: right;
}

.news-content-text {
    color: #666;
}

/* Articles Medium-style */
.articles-content {
    max-width: 800px;
    margin: 0 auto;
}

.article-item {
    display: flex;
    justify-content: space-between;
    gap: 2rem;
    padding: 2.5rem 0;
    border-bottom: 1px solid #f0f0f0;
}

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

.article-info {
    flex: 1;
}

.article-meta {
    font-size: 0.875rem;
    color: #666;
    margin-bottom: 0.75rem;
    font-weight: 500;
}

.article-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: #1a1a1a;
    line-height: 1.3;
}

.article-title a {
    color: inherit;
    text-decoration: none;
}

.article-title a:hover {
    text-decoration: none;
    color: #0D4F3C;
}

.article-summary {
    font-size: 1rem;
    color: #666;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-image {
    width: 200px;
    height: 134px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background-color: #f9f9f9;
    border-radius: 4px;
    border: 1px solid #f0f0f0;
}

.article-image img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

@media (max-width: 600px) {
    .article-item {
        flex-direction: column-reverse;
        gap: 1.5rem;
    }
    .article-image {
        width: 100%;
        height: 200px;
    }
}

/* Mobile Styles */
@media (max-width: 768px) {
    .content-container {
        padding: 0 1rem;
    }

    .nav-container {
        padding: 0 1rem;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 64px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        border-top: 1px solid #e5e5e5;
        padding: 2rem 0;
        gap: 0;
		z-index: 1500;
        transform: none;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-item {
        margin: 1rem 0;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active .nav-toggle-bar:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active .nav-toggle-bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .nav-toggle.active .nav-toggle-bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    /* Main content mobile */
    .content-container {
        grid-template-columns: 1fr;
        gap: 1rem;
        padding: 2rem 1rem;
        text-align: center;
        min-height: calc(100vh - 64px);
    }

    .simple-container {
        padding: 2rem 1rem;
    }

    .profile-image {
        width: 150px;
        height: 150px;
    }

    .profile-name {
        font-size: 1.8rem;
    }

    .profile-name-chinese {
        font-size: 1.25rem;
    }

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

    .content-description {
        padding-right: 0;
    }

    .info-sections {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .contact-icon-link {
        width: 40px;
        height: 40px;
    }

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

    /* Page content mobile */
    .bio-content,
    .publications-content,
    .presentations-content,
    .news-content,
    .experience-content,
    .projects-content,
    .teaching-content {
        padding: 2rem 1rem;
        margin: 0 1rem;
    }

    .page-title {
        font-size: 2rem;
    }

    .publication-item,
    .presentation-item,
    .teaching-item,
    .experience-item {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .publication-year,
    .presentation-year,
    .teaching-year,
    .experience-year {
        text-align: left;
        font-size: 0.875rem;
    }

    .news-item {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }

    .news-date {
        text-align: left;
    }

    .award-item {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }

    .award-year {
        text-align: left;
        font-size: 0.875rem;
    }
}

@media (max-width: 480px) {
    .content-container {
        padding: 1rem;
    }

    .simple-container {
        padding: 1rem;
    }

    .profile-name {
        font-size: 1.75rem;
    }

    .content-title {
        font-size: 1.75rem;
    }

    .contact-links {
        gap: 0.75rem;
    }

    .bio-content,
    .publications-content,
    .presentations-content,
    .news-content,
    .experience-content,
    .projects-content,
    .teaching-content {
        padding: 1.5rem 1rem;
        margin: 0 0.5rem;
    }

    .lectures-grid {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }

    .lecture-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
}

/* Teaching Course Content Styles */
.course-overview {
    margin-top: 1rem;
}

.course-content {
    margin-top: 2rem;
    padding: 1.5rem;
    border: 1px solid #e9ecef;
    border-radius: 10px;
    background-color: #fbfcfc;
}

.course-content h4 {
    color: #0D4F3C;
    font-size: 1.125rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.lectures-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.lecture-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background-color: #f8f9fa;
    border-radius: 6px;
    border: 1px solid #e9ecef;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.lecture-item:hover {
    background-color: #e8f5e8;
    border-color: #0D4F3C;
}

.lecture-title {
    font-weight: 500;
    color: #1a1a1a;
    flex-grow: 1;
    margin-right: 1rem;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background-color: #0D4F3C;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: background-color 0.2s ease, transform 0.1s ease;
}

@media (max-width: 768px) {
    .teaching-tabs {
        grid-template-columns: 1fr;
    }
}

.download-btn:hover {
    background-color: #0a3d2f;
    transform: translateY(-1px);
}

.download-btn:active {
    transform: translateY(0);
}

.download-btn svg {
    width: 14px;
    height: 14px;
}

/* Dark mode styles for teaching content */
.dark-mode .lecture-item {
    background-color: #2a2a2a;
    border-color: #404040;
}

.dark-mode .lecture-item:hover {
    background-color: #1e3a1e;
    border-color: #4a7c59;
}

.dark-mode .lecture-title {
    color: #e0e0e0;
}

.dark-mode .download-btn {
    background-color: #4a7c59;
}

.dark-mode .download-btn:hover {
    background-color: #5a8c69;
}

/* Contact section two-column layout */
.contact-section {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 4rem;
}

.contact-left {}

.contact-right {
    display: flex;
    align-items: center;
}

/* Download button styling for dark background */
.contact-right .abstract-btn {
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: white;
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 500;
}

.contact-right .abstract-btn:hover {
    background-color: rgba(255, 255, 255, 0.2);
    border-color: white;
    color: white;
    transform: translateY(-1px);
}

@media (max-width: 768px) {
    .contact-section {
        flex-direction: column;
        gap: 1.5rem;
    }

    .contact-right {
        align-self: flex-start;
    }
}