/* ============================================
   Academic Profile - Minimalist Theme
   A clean, black & white academic profile
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
    /* Colors - Easy to customize */
    --color-bg: #ffffff;
    --color-text: #1a1a1a;
    --color-text-light: #666666;
    --color-text-muted: #999999;
    --color-border: #e5e5e5;
    --color-accent: #000000;
    --color-accent-hover: #333333;
    --color-link: #0066cc;
    --color-link-hover: #004499;
    --color-bg-light: #f9f9f9;
    
    /* Typography */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --line-height: 1.7;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Layout */
    --sidebar-width: 380px;
    --content-max-width: 800px;
    --container-padding: 2rem;
}

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

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
    scroll-padding-top: 70px; /* Offset for fixed navbar */
}

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

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

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

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

/* ---------- Navigation Bar ---------- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    padding: 0.75rem 0;
}

.nav-container {
    display: flex;
    align-items: center;
    padding: 0;
}

.nav-logo {
    width: var(--sidebar-width);
    flex-shrink: 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    text-decoration: none;
    text-align: center;
    padding: 0 var(--spacing-lg);
    box-sizing: border-box;
}

.nav-logo:hover {
    color: var(--color-link);
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
    padding-left: var(--spacing-lg);
}

.nav-link {
    color: var(--color-text);
    font-size: 0.9rem;
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
    transition: color 0.2s ease;
}

.nav-link:hover {
    color: var(--color-link);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-link);
    transition: width 0.2s ease;
}

.nav-link:hover::after {
    width: 100%;
}

/* ---------- Layout ---------- */
.container {
    display: flex;
    min-height: 100vh;
    margin-top: 52px; /* Height of navbar */
}

/* ---------- Sidebar ---------- */
.sidebar {
    width: var(--sidebar-width);
    padding: var(--spacing-xl) var(--spacing-lg);
    border-right: 1px solid var(--color-border);
    position: sticky;
    top: 52px; /* Height of navbar */
    height: calc(100vh - 52px);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.profile-image {
    width: 180px;
    height: 180px;
    margin-bottom: var(--spacing-md);
    border-radius: 50%;
    overflow: hidden;
    border: 3px solid var(--color-border);
}

.profile-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.name {
    font-size: 1.5rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 0.25rem;
    color: var(--color-text);
}

.name .name-first {
    display: block;
}

.name .name-last {
    display: block;
}

.nickname {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    text-align: center;
    margin-bottom: 0.5rem;
    font-style: italic;
}

.title-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-bottom: 0.5rem;
}

.title-badge .icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.title {
    font-size: 0.95rem;
    color: var(--color-text-light);
    text-align: center;
    margin-bottom: var(--spacing-xs);
}

.affiliation {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    text-align: center;
    margin-bottom: var(--spacing-md);
}

/* Contact Info */
.contact-info {
    margin-bottom: var(--spacing-md);
    width: 100%;
    display: flex;
    flex-direction: row;
    justify-content: center;
    gap: var(--spacing-sm);
}

.contact-item {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    font-size: 0.85rem;
    color: var(--color-text-light);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    transition: all 0.25s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
}

.contact-item:hover {
    color: var(--color-text);
    transform: translateY(-3px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
    border-color: var(--color-text-muted);
}

.contact-item:active {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.08);
}

.contact-item .icon {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
}

.contact-item span {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* CV Button */
.cv-download {
    text-align: center;
    width: 100%;
    display: flex;
    justify-content: center;
}

.btn-cv {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    /* Width = 4 icons (48px each) + 3 gaps (16px each) = 240px */
    width: 240px;
    padding: 12px var(--spacing-md);
    background-color: var(--color-accent);
    color: var(--color-bg);
    font-size: 0.85rem;
    font-weight: 500;
    border-radius: 10px;
    transition: all 0.25s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.btn-cv .icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.btn-cv:hover {
    background-color: var(--color-accent-hover);
    color: var(--color-bg);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

/* ---------- Main Content ---------- */
.content {
    flex: 1;
    padding: var(--spacing-xl) var(--spacing-xl);
    max-width: var(--content-max-width);
    margin: 0 auto;
}

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

.section:last-of-type {
    border-bottom: none;
}

.section-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.section p {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-light);
}

/* ---------- Research Interests ---------- */
.research-interests {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.interest-tag {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding: 0.75rem 1rem;
    background-color: #f0f0f0;
    border-radius: 6px;
    border-left: 3px solid var(--color-accent);
}

.interest-tag:nth-child(1) { border-color: #3b82f6; }
.interest-tag:nth-child(2) { border-color: #22c55e; }
.interest-tag:nth-child(3) { border-color: #f97316; }
.interest-tag:nth-child(4) { border-color: #a855f7; }

.tag-title {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-text);
}

.tag-desc {
    font-size: 0.85rem;
    color: var(--color-text-light);
}

/* ---------- News Section ---------- */
.news-list {
    list-style: none;
}

.news-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-xs) 0;
    font-size: 0.95rem;
}

.news-date {
    flex-shrink: 0;
    width: 80px;
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

.news-content {
    color: var(--color-text-light);
}

/* ---------- Timeline (Education & Experience) ---------- */
.timeline {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.timeline-item {
    display: flex;
    gap: var(--spacing-md);
}

.timeline-period {
    flex-shrink: 0;
    width: 120px;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    padding-top: 2px;
}

.timeline-content h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--color-text);
}

.timeline-content .institution {
    font-size: 0.95rem;
    color: var(--color-text-light);
    margin-bottom: 2px;
}

.timeline-content .details {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* ---------- Publications Section ---------- */
.pub-note {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.equal-star {
    color: #dc2626;
    font-style: normal;
}

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

.pub-item {
    display: flex;
    gap: var(--spacing-md);
}

.pub-year {
    flex-shrink: 0;
    width: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-muted);
}

.pub-content {
    flex: 1;
}

.pub-title {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 2px;
    color: var(--color-text);
    line-height: 1.4;
}

.pub-authors {
    font-size: 0.9rem;
    color: var(--color-text-light);
}

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

.pub-venue {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    font-style: italic;
}

.pub-tag {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    font-style: normal;
    padding: 2px 8px;
    border-radius: 3px;
    margin-right: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tag-oral {
    background-color: #fee2e2;
    color: #dc2626;
}

.tag-spotlight {
    background-color: #fef3c7;
    color: #d97706;
}

.tag-poster {
    background-color: #dbeafe;
    color: #2563eb;
}

.tag-workshop {
    background-color: #e0e7ff;
    color: #4f46e5;
}

.tag-history {
    background-color: #f3f4f6;
    color: #374151;
    border: 1px dashed #9ca3af;
}

.pub-note-detail {
    /* font-size: 0.8rem; */
    color: var(--color-text-muted);
    display: inline-block;
}

.icon-check {
    vertical-align: middle;
    margin-left: 2px;
}

.awards-note {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    font-style: italic;
}

.pub-keywords {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-bottom: 4px;
}

.pub-keywords strong {
    color: var(--color-text-light);
}

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

.pub-link {
    font-size: 0.8rem;
    padding: 2px 8px;
    background-color: #e5e5e5;
    border-radius: 3px;
    color: var(--color-text-light);
    transition: all 0.2s ease;
}

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

/* Tag inside pub-links */
.pub-links .pub-tag {
    font-size: 0.8rem;
    padding: 2px 8px;
    margin-right: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* ---------- Awards Section ---------- */
.awards-list {
    list-style: none;
}

.awards-list li {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-xs) 0;
    font-size: 0.95rem;
}

.award-year {
    flex-shrink: 0;
    width: 50px;
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

.award-name {
    color: var(--color-text-light);
}

.award-detail {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* ---------- Footer ---------- */
.footer {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer p {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.footer-note {
    margin-top: var(--spacing-xs);
}

/* ---------- Responsive Design ---------- */

/* Hamburger menu button - hidden on desktop */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    margin-left: auto;
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    position: relative;
    transition: background-color 0.2s ease;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    left: 0;
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    transition: transform 0.2s ease;
}

.hamburger::before {
    top: -7px;
}

.hamburger::after {
    top: 7px;
}

/* Hamburger animation when active */
.nav-toggle.active .hamburger {
    background-color: transparent;
}

.nav-toggle.active .hamburger::before {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active .hamburger::after {
    transform: rotate(-45deg) translate(5px, -5px);
}

@media (max-width: 900px) {
    /* Navbar responsive */
    .nav-container {
        flex-wrap: wrap;
        padding: 0 var(--spacing-md);
    }
    
    .nav-logo {
        width: auto;
        padding: 0;
        text-align: left;
    }
    
    .nav-toggle {
        display: block;
    }
    
    .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: 0;
        padding: var(--spacing-sm) 0 0 0;
        border-top: 1px solid var(--color-border);
        margin-top: var(--spacing-sm);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-link {
        padding: 0.75rem 0;
        border-bottom: 1px solid var(--color-border);
    }
    
    .nav-link:last-child {
        border-bottom: none;
    }
    
    .nav-link::after {
        display: none;
    }

    .container {
        flex-direction: column;
        margin-top: 52px;
    }
    
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        top: auto;
        border-right: none;
        border-bottom: 1px solid var(--color-border);
        padding: var(--spacing-lg);
        padding-bottom: var(--spacing-xl);
    }
    
    .profile-image {
        width: 150px;
        height: 150px;
    }
    
    /* Name displays on one line in mobile */
    .name .name-first,
    .name .name-last {
        display: inline;
    }
    
    .contact-info {
        display: flex;
        flex-direction: row;
        justify-content: center;
        align-items: center;
        gap: var(--spacing-sm);
        flex-wrap: wrap;
    }
    
    .contact-item {
        width: 44px;
        height: 44px;
        border-radius: 10px;
    }
    
    .contact-item span {
        display: none;
    }
    
    .contact-item .icon {
        width: 22px;
        height: 22px;
    }
    
    /* CV button width = 4 icons (44px) + 3 gaps (16px) = 224px */
    .btn-cv {
        width: 224px;
    }
    
    .content {
        padding: var(--spacing-lg);
        padding-top: var(--spacing-xl);
    }
    
    .timeline-item,
    .pub-item,
    .news-item,
    .awards-list li {
        flex-direction: column;
        gap: var(--spacing-xs);
    }
    
    .timeline-period,
    .pub-year,
    .news-date,
    .award-year {
        width: auto;
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-base: 15px;
    }
    
    .sidebar {
        padding: var(--spacing-md);
    }
    
    .content {
        padding: var(--spacing-md);
    }
    
    .profile-image {
        width: 120px;
        height: 120px;
    }
    
    .name {
        font-size: 1.3rem;
    }
    
    .contact-info {
        gap: 10px;
    }
    
    /* CV button width = 4 icons (42px) + 3 gaps (10px) = 198px */
    .btn-cv {
        width: 198px;
        padding: 10px var(--spacing-sm);
    }
    
    .contact-item {
        width: 42px;
        height: 42px;
        border-radius: 8px;
    }
    
    .contact-item .icon {
        width: 20px;
        height: 20px;
    }
    
    .section-title {
        font-size: 1.2rem;
    }
    
    .pub-tags-legend {
        display: none;
    }
}

/* ---------- Ongoing Section ---------- */
.ongoing-note {
    margin-bottom: var(--spacing-md);
}

.ongoing-badge {
    display: inline-block;
    background-color: #dcfce7;
    color: #16a34a;
    font-size: 0.8rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 20px;
}

.ongoing-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.ongoing-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background: var(--color-bg);
    border-radius: 12px;
    padding: var(--spacing-sm) var(--spacing-md);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.04);
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.ongoing-item:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12), 0 4px 8px rgba(0, 0, 0, 0.06);
    transform: translateY(-2px);
}

.ongoing-number {
    flex-shrink: 0;
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #e5e5e5;
    border-radius: 8px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-weight: 700;
    color: var(--color-text-light);
}

.ongoing-content {
    flex: 1;
    min-width: 0;
}

.ongoing-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    /* margin-bottom: 2px; */
    line-height: 1.4;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Ongoing Tags */
.ongoing-tag {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 600;
    font-style: normal;
    padding: 2px 6px;
    border-radius: 3px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    flex-shrink: 0;
}

.tag-theoretical {
    background-color: #dcfce7;
    color: #16a34a;
}

.tag-empirical {
    background-color: #ffedd5;
    color: #ea580c;
}

.tag-conceptual {
    background-color: #e7d4c0;
    color: #78350f;
}

.ongoing-keywords {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.ongoing-kw {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 500;
    white-space: nowrap;
    color: #9ca3af;
}

.ongoing-tag + .ongoing-kw {
    color: #dc2626;
}

.ongoing-kw::before {
    content: "[ ";
    text-decoration: none;
    display: inline-block;
}

.ongoing-kw::after {
    content: " ]";
    text-decoration: none;
    display: inline-block;
}

.ongoing-date {
    flex-shrink: 0;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text-light);
    white-space: nowrap;
}

/* Responsive for Ongoing Section */
@media (max-width: 768px) {
    .ongoing-item {
        flex-direction: column;
        gap: var(--spacing-xs);
        padding: var(--spacing-md);
        text-align: center;
    }
    
    .ongoing-number {
        display: none;
    }
    
    .ongoing-date {
        display: none;
    }
    
    .ongoing-content {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    
    .ongoing-title {
        text-align: center;
    }
    
    .ongoing-keywords {
        justify-content: center;
    }
    
    /* Chỉ hiện keyword đầu tiên */
    .ongoing-kw:not(:first-child) {
        display: none;
    }
}

/* ---------- Print Styles ---------- */
@media print {
    .container {
        display: block;
    }
    
    .sidebar {
        width: 100%;
        position: relative;
        height: auto;
        border: none;
        page-break-after: avoid;
    }
    
    .content {
        padding: 0;
    }
    
    .btn-cv {
        display: none;
    }
}