/* CSS Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

/* CSS Custom Properties for Theming */
:root {
    /* Light Mode Colors */
    --bg-color: #ffffff;
    --text-color: #000000;
    --header-bg: #4a5568;
    --header-text: #ffffff;
    --accent-color: #3182ce;
    --accent-hover: #2c5aa0;
    --border-color: #e2e8f0;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --code-bg: #f7fafc;
    --card-bg: #ffffff;
    --card-border: #e2e8f0;
    --nav-hover: rgba(255, 255, 255, 0.1);
    --footer-bg: #f7fafc;
}

[data-theme="dark"] {
    /* Dark Mode Colors */
    --bg-color: #1a202c;
    --text-color: #e2e8f0;
    --header-bg: #2d3748;
    --header-text: #e2e8f0;
    --accent-color: #63b3ed;
    --accent-hover: #4299e1;
    --border-color: #4a5568;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --code-bg: #2d3748;
    --card-bg: #2d3748;
    --card-border: #4a5568;
    --nav-hover: rgba(255, 255, 255, 0.1);
    --footer-bg: #2d3748;
}

/* Base Typography */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

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

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

h5 {
    font-size: 1.125rem;
}

h6 {
    font-size: 1rem;
}

p {
    margin-bottom: 1rem;
}

/* List Styles */
ol,
ul {
    margin-bottom: 1rem;
    padding-left: 2rem;
}

ol li,
ul li {
    margin-bottom: 0.5rem;
}

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

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

/* Header Styles */
.site-header {
    background-color: var(--header-bg);
    color: var(--header-text);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 4px var(--shadow-color);
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-brand a {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--header-text);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 1.5rem;
    margin: 0;
    padding: 0;
}

.nav-links a {
    color: var(--header-text);
    padding: 0.5rem 1rem;
    border-radius: 0.25rem;
    transition: background-color 0.3s ease;
}

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

.nav-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-left: auto;
}

.social-icons {
    display: flex;
    gap: 0.75rem;
}

.social-icons a {
    color: var(--header-text);
    padding: 0.5rem;
    border-radius: 0.25rem;
    transition: background-color 0.3s ease;
}

.social-icons a:hover {
    background-color: var(--nav-hover);
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--header-text);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 0.25rem;
    transition: background-color 0.3s ease;
}

.theme-toggle:hover {
    background-color: var(--nav-hover);
}

/* Mobile Navigation - Hidden on Desktop */
.mobile-nav-dropdown {
    display: none;
}

/* Hero Section */
.hero-section {
    padding: 4rem 0;
}

.hero-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    align-items: center;
}

.hero-text h1 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.hero-image {
    text-align: center;
}

.profile-image {
    width: 350px;
    height: 350px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--accent-color);
    cursor: pointer;
    transition: transform 0.3s ease;
}

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

/* Latest Content Section */
.latest-content {
    padding: 3rem 0;
}

.content-boxes {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.content-box {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 0.5rem;
    padding: 1.5rem;
    box-shadow: 0 2px 4px var(--shadow-color);
}

.box-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.box-header h2 {
    margin-bottom: 0;
}

.view-all-link {
    color: var(--accent-color);
    font-size: 0.9rem;
}

.content-item {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

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

.item-date {
    font-size: 0.85rem;
    color: var(--text-color);
    opacity: 0.7;
    margin-bottom: 0.25rem;
}

.content-item h3 {
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

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

.item-summary {
    font-size: 0.9rem;
    opacity: 0.8;
    margin-bottom: 0.5rem;
}

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

.tag {
    background-color: var(--accent-color);
    color: white;
    padding: 0.2rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
}

.tech-tag {
    background-color: var(--border-color);
    color: var(--text-color);
    padding: 0.2rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
}

.no-content {
    text-align: center;
    opacity: 0.6;
    font-style: italic;
}

/* Section Headers */
.section-header {
    text-align: center;
    padding: 2rem 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 2rem;
}

.section-description {
    margin-top: 1rem;
    font-size: 1.1rem;
    opacity: 0.8;
}

/* Blog Styles */
.blog-list {
    max-width: 800px;
    margin: 0 auto;
}

.blog-item {
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.blog-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.blog-date {
    font-size: 0.9rem;
    opacity: 0.7;
}

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

.blog-title {
    margin-bottom: 1rem;
}

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

.blog-summary {
    margin-bottom: 1rem;
    opacity: 0.8;
}

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

/* Research Styles */
.research-list {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.research-item {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 2rem;
    align-items: center;
    padding: 2rem;
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 0.5rem;
    box-shadow: 0 2px 4px var(--shadow-color);
}

.research-item.image-right {
    grid-template-columns: 2fr 1fr;
}

.research-item.image-right .research-image {
    order: 2;
}

.research-item.image-right .research-content {
    order: 1;
}

.research-image img {
    width: 100%;
    max-width: 300px;
    height: auto;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: transform 0.3s ease;
}

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

.research-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    opacity: 0.7;
}

.research-title {
    margin-bottom: 0.5rem;
}

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

.research-authors {
    margin-bottom: 1rem;
    font-style: italic;
}

.research-description {
    margin-bottom: 1rem;
}

.research-abstract-section {
    margin-bottom: 1rem;
}

.research-abstract {
    margin-top: 1rem;
    padding: 1rem;
    background-color: var(--code-bg);
    border-radius: 0.25rem;
    border-left: 4px solid var(--accent-color);
}

.research-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

/* Button Styles */
.btn {
    padding: 0.5rem 1rem;
    border-radius: 0.25rem;
    text-decoration: none;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    line-height: 1.25rem;
}

.btn-primary {
    background-color: var(--accent-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    color: white;
    text-decoration: none;
}

.btn-secondary {
    background-color: var(--border-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--accent-color);
    color: white;
    text-decoration: none;
}

/* Research specific button styles */
.research-buttons .btn {
    padding: 0.5rem 1rem;
    border-radius: 0.25rem;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    text-decoration: none;
    font-family: inherit;
}

.research-buttons .abstract-toggle {
    background-color: var(--border-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.research-buttons .abstract-toggle:hover {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

.research-links {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.paper-link {
    background-color: var(--accent-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 0.25rem;
    text-decoration: none;
    transition: background-color 0.3s ease;
}

.paper-link:hover {
    background-color: var(--accent-hover);
}

/* Projects Grid */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.project-item {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 0.5rem;
    overflow: hidden;
    box-shadow: 0 2px 4px var(--shadow-color);
    transition: transform 0.3s ease;
}

.project-item:hover {
    transform: translateY(-4px);
}

.project-image img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    cursor: pointer;
}

.project-content {
    padding: 1.5rem;
}

.project-title {
    margin-bottom: 1rem;
}

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

.project-summary {
    margin-bottom: 1rem;
    opacity: 0.8;
}

.project-tech {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

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

.github-link,
.project-link {
    color: var(--accent-color);
    font-weight: 500;
}

/* Hobbies Styles */
.hobbies-list {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.hobby-item {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 2rem;
    align-items: center;
    padding: 2rem;
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 0.5rem;
    box-shadow: 0 2px 4px var(--shadow-color);
}

.hobby-item.image-right {
    grid-template-columns: 2fr 1fr;
}

.hobby-item.image-right .hobby-image {
    order: 2;
}

.hobby-item.image-right .hobby-content {
    order: 1;
}

.hobby-image img {
    width: 100%;
    max-width: 300px;
    height: auto;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: transform 0.3s ease;
}

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

.hobby-title {
    margin-bottom: 1rem;
}

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

.hobby-description {
    margin-bottom: 1rem;
    opacity: 0.8;
}

/* News Styles */
.news-list {
    max-width: 800px;
    margin: 0 auto;
}

.news-item {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.news-meta {
    margin-bottom: 0.5rem;
}

.news-date {
    font-size: 0.9rem;
    opacity: 0.7;
}

.news-title {
    margin-bottom: 1rem;
}

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

.news-summary {
    margin-bottom: 1rem;
    opacity: 0.8;
}

/* Single Page Styles */
.single-content,
.blog-single,
.research-single,
.project-single,
.hobby-single,
.news-single {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 0;
}

.content-header,
.blog-header,
.research-header,
.project-header,
.hobby-header,
.news-header {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.content-meta,
.blog-meta,
.research-meta,
.project-meta,
.hobby-meta,
.news-meta {
    margin-top: 1rem;
    font-size: 0.9rem;
    opacity: 0.7;
}

.research-single .research-image,
.project-single .project-image,
.hobby-single .hobby-image {
    text-align: center;
    margin: 2rem 0;
}

.research-single .research-image img,
.project-single .project-image img,
.hobby-single .hobby-image img {
    max-width: 100%;
    height: auto;
    border-radius: 0.5rem;
    cursor: pointer;
}

.research-abstract,
.project-summary,
.hobby-description,
.news-summary {
    background-color: var(--code-bg);
    padding: 1.5rem;
    border-radius: 0.5rem;
    margin: 2rem 0;
}

.content-body,
.blog-content,
.research-content,
.project-content,
.hobby-content,
.news-content {
    line-height: 1.8;
}

.content-body img,
.blog-content img,
.research-content img,
.project-content img,
.hobby-content img,
.news-content img {
    max-width: 100%;
    height: auto;
    border-radius: 0.5rem;
    margin: 1rem 0;
    cursor: pointer;
}

.content-nav,
.blog-nav,
.research-nav,
.project-nav,
.hobby-nav,
.news-nav {
    display: flex;
    justify-content: space-between;
    margin: 2rem 0;
    padding: 1rem 0;
    border-top: 1px solid var(--border-color);
}

.nav-prev,
.nav-next {
    color: var(--accent-color);
    font-weight: 500;
}

.back-to-list {
    text-align: center;
    margin-top: 1rem;
}

.back-to-list a {
    color: var(--accent-color);
}

/* Footer */
.site-footer {
    background-color: var(--footer-bg);
    padding: 2rem 0;
    margin-top: 4rem;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.7;
}

/* Image Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
}

.modal-content {
    position: relative;
    margin: auto;
    display: block;
    width: 90%;
    max-width: 900px;
    top: 50%;
    transform: translateY(-50%);
    text-align: center;
}

.modal-content img {
    width: 100%;
    height: auto;
    max-height: 80vh;
    object-fit: contain;
}

.close {
    position: absolute;
    top: 15px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover {
    color: #bbb;
}

#modalCaption {
    margin: 15px auto;
    display: block;
    width: 80%;
    max-width: 700px;
    text-align: center;
    color: #ccc;
    padding: 10px 0;
}

/* Clickable Images */
.clickable-image {
    cursor: pointer;
    transition: transform 0.3s ease;
}

.clickable-image:hover {
    transform: scale(1.02);
}

/* Code Blocks */
pre,
code {
    background-color: var(--code-bg);
    border-radius: 0.25rem;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
}

pre {
    padding: 1rem;
    overflow-x: auto;
    margin: 1rem 0;
}

code {
    padding: 0.2rem 0.4rem;
    font-size: 0.9em;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 0.5rem;
    }

    .main-nav {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        gap: 1rem;
    }

    /* Hide desktop navigation on mobile */
    .desktop-nav {
        display: none;
    }

    /* Mobile dropdown navigation */
    .mobile-nav-dropdown {
        display: block;
        position: relative;
    }

    .mobile-nav-toggle {
        background: none;
        border: none;
        color: var(--header-text);
        cursor: pointer;
        padding: 0.5rem;
        border-radius: 0.25rem;
        transition: background-color 0.3s ease;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .mobile-nav-toggle:hover {
        background-color: var(--nav-hover);
    }

    .mobile-nav-toggle svg {
        transition: transform 0.3s ease;
    }

    .mobile-nav-menu {
        position: absolute;
        top: 100%;
        right: 0;
        background-color: var(--header-bg);
        border: 1px solid var(--border-color);
        border-radius: 0.5rem;
        box-shadow: 0 4px 8px var(--shadow-color);
        min-width: 180px;
        z-index: 1000;
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: all 0.3s ease;
        list-style: none;
        padding: 0.5rem 0;
        margin: 0.5rem 0 0 0;
    }

    .mobile-nav-menu.open {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .mobile-nav-menu li {
        margin: 0;
        padding: 0;
    }

    .mobile-nav-menu a {
        display: block;
        padding: 0.75rem 1rem;
        color: var(--header-text);
        text-decoration: none;
        transition: background-color 0.3s ease;
        border-radius: 0;
    }

    .mobile-nav-menu a:hover,
    .mobile-nav-menu a.active {
        background-color: var(--nav-hover);
    }

    /* Hide social icons on mobile, keep only theme toggle */
    .nav-controls .social-icons {
        display: none;
    }

    .nav-controls {
        display: flex;
        align-items: center;
        gap: 1rem;
    }

    /* Style social links in mobile dropdown */
    .mobile-social-divider {
        height: 1px;
        background-color: var(--border-color);
        margin: 0.5rem 1rem;
        opacity: 0.3;
    }

    .mobile-social-link {
        display: flex;
        align-items: center;
        gap: 0.75rem;
        padding: 0.75rem 1rem !important;
        color: var(--header-text) !important;
        text-decoration: none;
        transition: background-color 0.3s ease;
        font-size: 0.9rem;
    }

    .mobile-social-link:hover {
        background-color: var(--nav-hover) !important;
    }

    .mobile-social-link svg {
        flex-shrink: 0;
        opacity: 0.8;
    }
}

@media (max-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

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

    .research-item,
    .hobby-item {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .research-item.image-right .research-image,
    .hobby-item.image-right .hobby-image {
        order: -1;
    }

    .research-item.image-right .research-content,
    .hobby-item.image-right .hobby-content {
        order: 1;
    }

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

    .blog-meta {
        flex-direction: column;
        align-items: flex-start;
    }

    .research-meta {
        flex-direction: column;
        gap: 0.5rem;
    }

    .project-links,
    .research-links,
    .research-buttons {
        flex-direction: column;
        gap: 0.5rem;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .hero-text h1 {
        font-size: 2.5rem;
    }

    .profile-image {
        width: 280px;
        height: 280px;
    }
}

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

    .research-item,
    .hobby-item,
    .project-item {
        padding: 1rem;
    }

    .hero-text h1 {
        font-size: 2rem;
    }

    .profile-image {
        width: 200px;
        height: 200px;
    }
}