/* ===== CSS Variables - Academic White & Blue Theme ===== */
:root {
    --primary-color: #1e40af;
    --primary-light: #3b82f6;
    --primary-dark: #1e3a8a;
    --secondary-color: #0ea5e9;
    --background: #ffffff;
    --background-alt: #f8fafc;
    --surface: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.7;
    font-size: 16px;
}

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

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--background);
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 60px;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    padding: 5px 0;
    border-bottom: 2px solid transparent;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

/* Hamburger Menu */
.hamburger {
    display: none;
    cursor: pointer;
}

.bar {
    display: block;
    width: 25px;
    height: 2px;
    margin: 5px auto;
    background-color: var(--text-primary);
    transition: var(--transition);
}

/* ===== Hero Section (Academic Style) ===== */
.hero {
    padding: 120px 20px 60px;
    background: var(--background);
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    align-items: flex-start;
    gap: 3rem;
}

.hero-image {
    flex: 0 0 180px;
}

.avatar-placeholder {
    width: 180px;
    height: 180px;
    border-radius: 8px;
    background: var(--surface);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
}

.avatar-placeholder i {
    font-size: 5rem;
    color: var(--text-muted);
}

/* Avatar Photo */
.avatar-photo {
    width: 180px;
    height: 220px;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.avatar-photo img {
    width: 100%;
    height: auto;
    min-height: 100%;
    object-fit: cover;
    object-position: center 30%;
    transform: scale(2);
    transform-origin: center 15%;
}

.hero-text {
    flex: 1;
}

.hero-text h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.affiliation {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.research-interests {
    margin-bottom: 1.5rem;
}

.research-interests h3 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.5rem;
}

.research-interests p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.contact-info {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.contact-item i {
    color: var(--primary-color);
    width: 16px;
}

.contact-item a {
    color: var(--primary-color);
    transition: var(--transition);
}

.contact-item a:hover {
    text-decoration: underline;
}

/* ===== Section Styles ===== */
.section {
    padding: 60px 20px;
}

.section:nth-child(even) {
    background: var(--background-alt);
}

.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2rem;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid var(--primary-color);
    display: inline-block;
}

/* ===== Tools Sections ===== */
.tools-section {
    margin-bottom: 3rem;
    padding: 2rem;
    border-radius: 8px;
}

.tools-section:nth-child(even) {
    background: var(--background-alt);
}

/* ===== Publications Section ===== */
.publications-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.publication-item {
    padding: 1.25rem;
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    border-left: 4px solid var(--primary-color);
}

.pub-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.pub-authors {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

.pub-authors strong {
    color: var(--primary-color);
}

.pub-venue {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-style: italic;
    margin-bottom: 0.75rem;
}

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

.pub-link {
    color: var(--primary-color);
    font-size: 0.85rem;
    font-weight: 500;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.pub-link:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* ===== Projects Section ===== */
.projects-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.project-item {
    padding: 1.25rem;
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: 6px;
}

.project-header {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    margin-bottom: 0.75rem;
}

.project-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 400;
}

.project-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
}

.project-links {
    display: flex;
    gap: 0.75rem;
}

.project-links a {
    color: var(--text-muted);
    font-size: 1.1rem;
    transition: var(--transition);
}

.project-links a:hover {
    color: var(--primary-color);
}

.project-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 0.75rem;
    line-height: 1.6;
}

.project-outcome {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
}

/* Links in project content */
.project-meta a,
.project-desc a,
.project-outcome a {
    color: var(--primary-color);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
    transition: var(--transition);
}

.project-meta a:hover,
.project-desc a:hover,
.project-outcome a:hover {
    color: var(--primary-dark);
    text-decoration-thickness: 2px;
}

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

/* Project item lists */
.project-item ul,
.project-item ol {
    padding-left: 1.5rem;
    margin: 0.75rem 0;
}

.project-item li {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.tag {
    padding: 3px 10px;
    background: var(--surface);
    color: var(--text-secondary);
    border-radius: 4px;
    font-size: 0.8rem;
    border: 1px solid var(--border-color);
}

/* ===== Tools Section ===== */
.tools-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.tools-category h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tools-category h4 i {
    color: var(--primary-color);
}

.tools-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.tool-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 8px 14px;
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    transition: var(--transition);
}

.tool-item:hover {
    border-color: var(--primary-color);
    background: var(--background-alt);
}

.tool-item i {
    font-size: 1.1rem;
    color: var(--primary-color);
}

.tool-item span {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
}

/* ===== Placeholder Note ===== */
.placeholder-note {
    color: var(--text-muted);
    font-style: italic;
    font-size: 0.9rem;
    padding: 1rem;
    background: var(--surface);
    border-radius: 6px;
    text-align: center;
}

/* ===== Loading & Error States ===== */
.loading {
    color: var(--text-muted);
    font-size: 0.95rem;
    padding: 2rem;
    text-align: center;
}

.error {
    color: #dc2626;
    font-size: 0.95rem;
    padding: 1rem;
    background: #fef2f2;
    border-radius: 6px;
    text-align: center;
}

/* ===== Footer ===== */
.footer {
    padding: 30px 20px;
    background: var(--background-alt);
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.footer p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 60px;
        flex-direction: column;
        background: var(--background);
        width: 100%;
        text-align: center;
        transition: var(--transition);
        padding: 20px 0;
        gap: 0;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-lg);
    }

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

    .nav-menu li {
        padding: 12px 0;
    }

    .hamburger {
        display: block;
    }

    .hamburger.active .bar:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

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

    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

    .hero-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .hero-text h1 {
        font-size: 1.75rem;
    }

    .contact-info {
        justify-content: center;
    }

    .section-title {
        font-size: 1.25rem;
    }

    .project-header {
        flex-direction: column;
        gap: 0.5rem;
    }
}

@media (max-width: 480px) {
    .hero-image {
        flex: 0 0 150px;
    }

    .avatar-placeholder {
        width: 150px;
        height: 150px;
    }

    .avatar-placeholder i {
        font-size: 4rem;
    }

    .contact-info {
        flex-direction: column;
        gap: 0.75rem;
    }

    .tools-list {
        flex-direction: column;
    }

    .tool-item {
        width: 100%;
    }
}

/* ===== Citation Count ===== */
.citation-count {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-left: 0.5rem;
}

.citation-count i {
    margin-right: 0.25rem;
}

.citation-count.highlight {
    color: var(--primary-color);
    font-weight: 600;
}

/* ===== Dimensions Badge ===== */
.pub-links .__dimensions_badge_embed__ {
    display: inline-flex;
    align-items: center;
    vertical-align: middle;
    margin-left: 0.5rem;
}

.pub-links .__dimensions_badge_embed__ > span {
    vertical-align: middle;
}

/* ===== Featured Publication ===== */
.publication-item.featured {
    background: linear-gradient(135deg, rgba(30, 64, 175, 0.05) 0%, rgba(59, 130, 246, 0.05) 100%);
    border-left-color: #f59e0b;
    border-left-width: 4px;
}

.publication-item.featured .pub-title {
    color: var(--primary-color);
}

/* ===== Page Section (for multi-page layout) ===== */
.page-section {
    padding-top: 100px;
    min-height: calc(100vh - 150px);
}

/* ===== Year Divider ===== */
.year-divider {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    padding: 1rem 0 0.5rem;
    margin-top: 1rem;
    border-bottom: 2px solid var(--primary-color);
    margin-bottom: 1rem;
}

.year-divider:first-child {
    margin-top: 0;
}

/* ===== About Content ===== */
.about-content {
    background: var(--background-alt);
    padding: 2rem;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.about-content p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ===== Section Intro ===== */
.section-intro {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1.05rem;
}

/* ===== Recipe Cards ===== */
.recipes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.recipe-card {
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    transition: var(--transition);
}

.recipe-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.recipe-image {
    height: 150px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.recipe-image i {
    font-size: 3rem;
    color: white;
}

.recipe-content {
    padding: 1.25rem;
}

.recipe-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.recipe-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.75rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.recipe-meta i {
    margin-right: 0.25rem;
    color: var(--primary-color);
}

.recipe-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    line-height: 1.5;
}

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

/* ===== Recipe Detail Page ===== */
.back-link {
    display: inline-block;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.95rem;
}

.back-link:hover {
    text-decoration: underline;
}

.recipe-detail-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.recipe-detail-meta {
    display: flex;
    gap: 1.5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.recipe-detail-meta i {
    margin-right: 0.5rem;
    color: var(--primary-color);
}

.recipe-detail-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.recipe-detail-content {
    background: var(--surface);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    line-height: 1.8;
}

.recipe-detail-content h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 1.5rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

.recipe-detail-content h2:first-child {
    margin-top: 0;
}

.recipe-detail-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
    margin: 1.25rem 0 0.5rem;
}

.recipe-detail-content ul,
.recipe-detail-content ol {
    padding-left: 1.5rem;
    margin-bottom: 1rem;
}

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

.recipe-detail-content blockquote {
    background: var(--background);
    border-left: 4px solid var(--primary-color);
    padding: 1rem 1.25rem;
    margin: 1rem 0;
    border-radius: 0 8px 8px 0;
    font-size: 0.95rem;
}

.recipe-detail-content a {
    color: var(--primary-color);
    text-decoration: underline;
}

.recipe-detail-content hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 2rem 0;
}

/* ===== Responsive for Recipe Grid ===== */
@media (max-width: 768px) {
    .recipes-grid {
        grid-template-columns: 1fr;
    }

    .page-section {
        padding-top: 80px;
    }
}

/* ===== Filter Buttons ===== */
.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.filter-btn {
    padding: 8px 16px;
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.filter-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: var(--surface);
}

.filter-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.publication-item.hidden,
.year-divider.hidden {
    display: none;
}

/* ===== Stats Container ===== */
.stats-container {
    display: flex;
    gap: 2rem;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: var(--surface);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    width: fit-content;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1.2;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ===== News Section ===== */
.news-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.news-item {
    display: flex;
    gap: 1.5rem;
    align-items: baseline;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

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

.news-date {
    flex: 0 0 80px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-muted);
    text-align: right;
}

.news-content {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

@media (max-width: 480px) {
    .stats-container {
        width: 100%;
        justify-content: space-around;
    }

    .news-item {
        flex-direction: column;
        gap: 0.25rem;
    }

    .news-date {
        text-align: left;
        color: var(--primary-color);
        font-size: 0.85rem;
    }
}