/* ============================================================================
   ACADEMIC PORTFOLIO - MINIMALIST DESIGN
   Simplified for AI Research
   ============================================================================ */

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

:root {
    /* Colors - Simple Blue Theme */
    --color-text: #1a202c;
    --color-text-secondary: #718096;
    --color-link: #2563eb;
    --color-link-hover: #1d4ed8;
    --color-accent: #3b82f6;
    --color-border: #e2e8f0;
    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-sidebar-bg: #1e293b;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Layout */
    --sidebar-width: 280px;
    --content-max-width: 900px;
}

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

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

/* Links */
a {
    color: var(--color-link);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

/* Typography
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }

p {
    margin-bottom: var(--spacing-sm);
}

strong {
    font-weight: 600;
}

/* Layout - Sidebar + Main Content
   ========================================================================== */
body {
    display: flex;
    min-height: 100vh;
}

/* Sidebar
   ========================================================================== */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--color-sidebar-bg);
    overflow-y: auto;
    padding: var(--spacing-xl) var(--spacing-lg);
    z-index: 1000;
}

.sidebar-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* Profile */
.profile {
    text-align: center;
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.profile-img {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: var(--spacing-md);
    border: 3px solid rgba(255, 255, 255, 0.2);
}

.profile-name {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: white;
}

.profile-title {
    color: rgba(255, 255, 255, 0.85);
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.profile-affiliation {
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.9rem;
    font-weight: 500;
}

/* Navigation */
.nav {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.nav-link {
    padding: 0.625rem 1rem;
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    font-weight: 500;
    border-radius: 6px;
    transition: all 0.2s ease;
    background: transparent;
}

.nav-link:hover {
    color: white;
    background: rgba(255, 255, 255, 0.1);
}

.nav-link.active {
    color: white;
    background: rgba(255, 255, 255, 0.15);
}

/* Social Links */
.social-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, 0.85);
    font-size: 1.1rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 6px;
    transition: all 0.2s ease;
}

.social-link:hover {
    color: white;
    border-color: rgba(255, 255, 255, 0.4);
    background: rgba(255, 255, 255, 0.1);
}

/* CV Download Button */
.cv-download {
    margin-top: auto;
}

.btn-download {
    display: block;
    width: 100%;
    padding: 0.75rem 1rem;
    background: white;
    color: var(--color-sidebar-bg);
    text-align: center;
    border-radius: 6px;
    font-weight: 600;
    transition: all 0.2s ease;
}

.btn-download:hover {
    background: #f8fafc;
    transform: translateY(-1px);
}

.btn-download i {
    margin-right: 0.5rem;
}

/* Main Content
   ========================================================================== */
.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    padding: var(--spacing-xl);
    max-width: calc(var(--content-max-width) + var(--sidebar-width) + 2 * var(--spacing-xl));
}

/* Section */
.section {
    margin-bottom: var(--spacing-xl);
    max-width: var(--content-max-width);
}

.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-accent);
}

.subsection-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

/* About Section */
.about-content p {
    text-align: justify;
    line-height: 1.7;
}

.interests-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.interests-list li {
    padding: 0.5rem 1rem;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
    transition: all 0.2s ease;
}

.interests-list li:hover {
    background: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
}

/* News Section
   ========================================================================== */
.news-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.news-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-bg-alt);
    border-left: 3px solid var(--color-accent);
    border-radius: 6px;
    transition: all 0.2s ease;
}

.news-item:hover {
    background: #f0f9ff;
    border-left-color: var(--color-link);
}

.news-date {
    flex-shrink: 0;
    width: 100px;
    font-weight: 600;
    color: var(--color-accent);
    font-size: 0.9rem;
}

.news-content {
    flex: 1;
    line-height: 1.6;
    color: var(--color-text);
}

.news-content strong {
    color: var(--color-link);
}

@media (max-width: 768px) {
    .news-item {
        flex-direction: column;
        gap: var(--spacing-xs);
    }

    .news-date {
        width: auto;
    }
}

/* Publications Section
   ========================================================================== */
.publication {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

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

.pub-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    line-height: 1.4;
    color: var(--color-text);
}

.pub-authors {
    color: var(--color-text-secondary);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.author-me {
    font-weight: 600;
    color: var(--color-text);
}

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

.pub-venue strong {
    color: var(--color-link);
    font-style: normal;
}

.pub-links {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.pub-link {
    padding: 0.5rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 0.875rem;
    color: var(--color-text);
    text-decoration: none;
    transition: all 0.2s ease;
    background: white;
}

.pub-link:hover {
    background: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
}

.pub-link i {
    margin-right: 0.375rem;
}

/* Timeline (Experience & Education)
   ========================================================================== */
.timeline-item {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

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

.timeline-date {
    color: var(--color-text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
}

.timeline-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.timeline-org {
    color: var(--color-link);
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.timeline-list {
    margin-left: 1.25rem;
    margin-top: var(--spacing-sm);
}

.timeline-list li {
    margin-bottom: 0.375rem;
    color: var(--color-text-secondary);
}

/* Blog Section
   ========================================================================== */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.blog-card {
    padding: var(--spacing-lg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    transition: all 0.2s ease;
    background: white;
}

.blog-card:hover {
    border-color: var(--color-accent);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transform: translateY(-2px);
}

.blog-date {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
}

.blog-title {
    margin-bottom: var(--spacing-sm);
}

.blog-title a {
    color: var(--color-text);
    text-decoration: none;
    font-size: 1.15rem;
    font-weight: 600;
}

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

.blog-excerpt {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
    font-size: 0.95rem;
}

.blog-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: var(--spacing-sm);
}

.blog-tag {
    padding: 0.25rem 0.75rem;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

.blog-link {
    color: var(--color-link);
    font-weight: 500;
    font-size: 0.9rem;
}

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

/* Blog Detail Page Styles
   ========================================================================== */
.blog-post-header {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--color-border);
}

.blog-post-title {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
    color: var(--color-text);
}

.blog-post-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

.blog-post-meta span {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.blog-post-meta i {
    color: var(--color-link);
}

.blog-post-content {
    font-size: 1.05rem;
    line-height: 1.7;
    max-width: var(--content-max-width);
}

.blog-post-content h2 {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    font-size: 1.75rem;
}

.blog-post-content h3 {
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    font-size: 1.4rem;
}

.blog-post-content p {
    margin-bottom: var(--spacing-md);
    text-align: justify;
}

.blog-post-content ul,
.blog-post-content ol {
    margin-bottom: var(--spacing-md);
    margin-left: var(--spacing-lg);
}

.blog-post-content li {
    margin-bottom: 0.5rem;
}

.blog-post-content pre {
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: 6px;
    padding: var(--spacing-md);
    overflow-x: auto;
    margin-bottom: var(--spacing-md);
}

.blog-post-content pre code {
    display: block;
    background: none;
    padding: 0;
    color: #e2e8f0;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
}

.blog-post-content code {
    background: #f1f5f9;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.875em;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    color: #475569;
    border: 1px solid var(--color-border);
}

.blog-post-content blockquote {
    border-left: 3px solid var(--color-accent);
    padding-left: var(--spacing-md);
    margin: var(--spacing-lg) 0;
    color: var(--color-text-secondary);
    font-style: italic;
    background: var(--color-bg-alt);
    padding: var(--spacing-md);
    border-radius: 0 6px 6px 0;
}

.blog-back-link {
    display: inline-flex;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    color: var(--color-link);
    font-weight: 500;
    padding: 0.5rem 1rem;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    transition: all 0.2s ease;
}

.blog-back-link:hover {
    background: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
}

.blog-back-link i {
    margin-right: 0.5rem;
}

/* Mobile Menu Toggle
   ========================================================================== */
.mobile-menu-toggle {
    display: none;
    position: fixed;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    z-index: 1001;
    width: 48px;
    height: 48px;
    background: var(--color-sidebar-bg);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1.2rem;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    transition: all 0.2s ease;
}

.mobile-menu-toggle:hover {
    background: #334155;
}

/* Responsive Design
   ========================================================================== */
@media (max-width: 768px) {
    body {
        display: block;
    }

    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .mobile-menu-toggle {
        display: block;
    }

    .timeline-item {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }

    .timeline-date {
        font-weight: 600;
        color: var(--color-text);
    }

    .profile-img {
        width: 120px;
        height: 120px;
    }

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

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

/* Print Styles
   ========================================================================== */
@media print {
    .sidebar,
    .mobile-menu-toggle,
    .social-links,
    .cv-download,
    .blog-back-link {
        display: none;
    }

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

    a {
        color: var(--color-text);
        text-decoration: underline;
    }

    .publication {
        page-break-inside: avoid;
    }
}