/* Professional Portfolio Styles - Formal & Minimalist */
:root {
    /* Professional color palette */
    --primary: #0a0a0a;
    --secondary: #141414;
    --surface: #1a1a1a;
    --card-bg: #1e1e1e;
    --accent: #2563eb;
    --accent-light: #3b82f6;
    --accent-muted: rgba(37, 99, 235, 0.1);
    --text: #f5f5f5;
    --text-secondary: #a3a3a3;
    --text-muted: #737373;
    --border: #2a2a2a;
    --border-light: #3a3a3a;
    --success: #22c55e;
    --gradient: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    --border-radius: 6px;
    --border-radius-lg: 12px;
    --transition: all 0.2s ease;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--text);
    background-color: var(--primary);
    line-height: 1.7;
    font-weight: 400;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: -0.02em;
}

h1 { font-size: 3rem; }
h2 { font-size: 2rem; margin-bottom: 2rem; }
h3 { font-size: 1.5rem; margin-bottom: 1rem; }
h4 { font-size: 1.125rem; margin-bottom: 0.5rem; }

p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

a {
    color: var(--accent-light);
    text-decoration: none;
    transition: var(--transition);
}

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

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Header */
header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

header.scrolled {
    padding: 0.75rem 5%;
    background: rgba(10, 10, 10, 0.95);
}

header .logo {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text);
    letter-spacing: -0.02em;
}

header nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

header nav ul li a {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
    transition: var(--transition);
}

header nav ul li a:hover {
    color: var(--text);
}

header nav ul li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: var(--transition);
}

header nav ul li a:hover::after {
    width: 100%;
}

header nav ul li a.active {
    color: var(--accent-light);
}

header nav ul li a.active::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background-color: var(--text);
    transition: var(--transition);
}

/* Hero Section */
#hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8rem 5% 4rem;
    position: relative;
    overflow: hidden;
}

#particles-js {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    opacity: 0.3;
}

#hero .content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
}

#hero h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text);
}

#hero .typed-text-wrapper {
    height: 2rem;
    margin-bottom: 1.5rem;
    font-family: var(--font-mono);
    font-size: 1.125rem;
    color: var(--accent-light);
}

#hero p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2rem;
}

#hero .btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 2rem;
    background: var(--accent);
    color: white;
    font-weight: 500;
    border-radius: var(--border-radius);
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

#hero .btn:hover {
    background: var(--accent-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

#hero .btn-secondary {
    background: transparent;
    border: 1px solid var(--border-light);
    color: var(--text);
    margin-left: 1rem;
}

#hero .btn-secondary:hover {
    border-color: var(--accent);
    background: var(--accent-muted);
}

/* Main Content */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding-top: 0;
}

section {
    padding: 6rem 5%;
    position: relative;
}

section h2 {
    text-align: center;
    position: relative;
    display: inline-block;
    width: 100%;
}

section h2 .section-number {
    color: var(--accent-light);
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 400;
    margin-right: 0.75rem;
}

/* About Section */
#about {
    background: var(--secondary);
}

#about .profile {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 3rem;
    align-items: start;
    margin-top: 3rem;
}

#about .profile-image {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: var(--border-radius-lg);
    border: 2px solid var(--border);
    transition: var(--transition);
}

#about .profile-image:hover {
    border-color: var(--accent);
    transform: scale(1.02);
}

#about .profile-content p {
    font-size: 1rem;
    line-height: 1.8;
}

.quick-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 2rem;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem;
    background: var(--surface);
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.stat-item:hover {
    border-color: var(--accent);
}

.stat-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-muted);
    border-radius: var(--border-radius);
    color: var(--accent-light);
    font-size: 1.25rem;
}

.stat-info h3 {
    font-size: 1.25rem;
    margin: 0;
    color: var(--text);
}

.stat-info span {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Hobbies Section */
.hobbies-section {
    margin-top: 3rem;
    padding: 2rem;
    background: var(--surface);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border);
}

.hobbies-section h3 {
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.hobbies-section h3 i {
    color: var(--accent-light);
}

.hobbies-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 1rem;
}

.hobby-item {
    text-align: center;
    padding: 1rem;
    background: var(--card-bg);
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.hobby-item:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.hobby-icon {
    font-size: 1.5rem;
    color: var(--accent-light);
    margin-bottom: 0.5rem;
}

.hobby-item h4 {
    font-size: 0.875rem;
    font-weight: 500;
    margin: 0;
}

/* Section Subtitle */
.section-subtitle {
    font-size: 1.25rem;
    color: var(--text);
    margin: 3rem 0 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.section-subtitle i {
    color: var(--accent-light);
}

/* Education Section */
#education {
    background: var(--primary);
}

.education-work-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-top: 2rem;
}

.timeline {
    position: relative;
    padding-left: 1.5rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 2px;
    background: var(--border);
}

.timeline-item {
    position: relative;
    padding-bottom: 2rem;
    padding-left: 1.5rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -1.5rem;
    top: 0.5rem;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid var(--primary);
}

.timeline-date {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--accent-light);
    margin-bottom: 0.25rem;
}

.timeline-content h4 {
    font-size: 1rem;
    color: var(--text);
    margin-bottom: 0.25rem;
}

.timeline-content p {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin: 0;
}

.timeline-status {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--accent-muted);
    color: var(--accent-light);
    font-size: 0.75rem;
    border-radius: 100px;
    margin-top: 0.5rem;
}

/* Qualifications Grid */
.qualifications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.qualification-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--surface);
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.qualification-item:hover {
    border-color: var(--accent);
}

.qualification-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-muted);
    border-radius: var(--border-radius);
    color: var(--accent-light);
}

.qualification-details h4 {
    font-size: 0.875rem;
    margin: 0;
}

.qualification-details p {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin: 0;
}

/* Skills Container */
.skills-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.skill-category {
    padding: 1.5rem;
    background: var(--surface);
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
}

.skill-category h4 {
    font-size: 0.875rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.skill-category h4 i {
    color: var(--accent-light);
}

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

.skill-tag {
    padding: 0.375rem 0.75rem;
    background: var(--card-bg);
    color: var(--text-secondary);
    font-size: 0.8125rem;
    border-radius: 100px;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.skill-tag:hover {
    border-color: var(--accent);
    color: var(--accent-light);
}

/* Research Section */
#research {
    background: var(--secondary);
}

.research-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-top: 2rem;
}

.research-item {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: 1.5rem;
    padding: 1.5rem;
    background: var(--surface);
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.research-item:hover {
    border-color: var(--accent);
}

.research-date {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--accent-light);
}

.research-content h4 {
    font-size: 1rem;
    color: var(--text);
    margin-bottom: 0.5rem;
}

.research-content p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin: 0;
}

.details-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1rem;
    padding: 0.5rem 1rem;
    background: transparent;
    color: var(--accent-light);
    font-size: 0.875rem;
    border: 1px solid var(--accent);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.details-btn:hover {
    background: var(--accent-muted);
}

/* Conference Grid */
.conference-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.conference-item {
    padding: 1.25rem;
    background: var(--surface);
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
    border-left: 3px solid var(--accent);
    transition: var(--transition);
}

.conference-item:hover {
    border-color: var(--accent);
}

.conference-item span {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent-light);
}

.conference-item h4 {
    font-size: 0.875rem;
    margin: 0.5rem 0;
}

.conference-item p {
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin: 0;
}

/* Projects Section */
#projects {
    background: var(--primary);
}

.projects-filter {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin: 2rem 0;
}

.filter-btn {
    padding: 0.5rem 1.25rem;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid var(--border);
    border-radius: 100px;
    cursor: pointer;
    transition: var(--transition);
}

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

.projects-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.project-card {
    background: var(--surface);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: var(--transition);
}

.project-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.project-image {
    width: 100%;
    height: 180px;
    object-fit: cover;
}

.project-content {
    padding: 1.5rem;
}

.project-content h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.project-content p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 1rem 0;
}

.project-tag {
    padding: 0.25rem 0.625rem;
    background: var(--accent-muted);
    color: var(--accent-light);
    font-size: 0.75rem;
    border-radius: 100px;
}

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

.project-link {
    padding: 0.5rem 1rem;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.8125rem;
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.project-link:hover {
    border-color: var(--accent);
    color: var(--accent-light);
}

/* Awards Section */
#achievements {
    background: var(--secondary);
}

.awards-timeline {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 2rem;
}

.award-item {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: 1.5rem;
    padding: 1.25rem;
    background: var(--surface);
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.award-item:hover {
    border-color: var(--accent);
}

.award-year {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--accent-light);
}

.award-content {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.award-icon {
    color: var(--accent-light);
    font-size: 1.25rem;
}

.award-content h4 {
    font-size: 0.9375rem;
    margin-bottom: 0.25rem;
}

.award-content p {
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin: 0;
}

/* Show More Button */
.show-more-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin: 2rem auto 0;
    padding: 0.75rem 1.5rem;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.875rem;
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.show-more-btn:hover {
    border-color: var(--accent);
    color: var(--accent-light);
}

.hidden-content {
    display: none;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.hidden-content.visible {
    display: block;
    opacity: 1;
    margin-top: 1rem;
}

/* Activities Section */
#activities {
    background: var(--primary);
}

.activities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.activity-card {
    padding: 1.5rem;
    background: var(--surface);
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.activity-card:hover {
    border-color: var(--accent);
}

.activity-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-muted);
    border-radius: var(--border-radius);
    color: var(--accent-light);
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.activity-content h4 {
    font-size: 0.9375rem;
    margin-bottom: 0.5rem;
}

.activity-content p {
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.activity-details-btn {
    background: none;
    border: none;
    color: var(--accent-light);
    font-size: 0.8125rem;
    cursor: pointer;
    padding: 0;
    transition: var(--transition);
}

.activity-details-btn:hover {
    color: var(--accent);
}

/* Affiliations Grid */
.affiliations-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.affiliation-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--surface);
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.affiliation-item:hover {
    border-color: var(--accent);
}

.affiliation-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-muted);
    border-radius: var(--border-radius);
    color: var(--accent-light);
}

.affiliation-content h4 {
    font-size: 0.875rem;
    margin: 0;
}

.affiliation-content p {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin: 0;
}

/* Media Section */
#media {
    background: var(--secondary);
}

.media-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.media-card {
    padding: 1.5rem;
    background: var(--surface);
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.media-card:hover {
    border-color: var(--accent);
}

.media-content h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.media-date {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent-light);
    margin-bottom: 0.5rem;
}

.media-content p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.media-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8125rem;
    color: var(--accent-light);
}

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

.media-note {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-style: italic;
}

/* Contact Section */
#contact {
    background: var(--primary);
    text-align: center;
}

.contact-container {
    display: flex;
    justify-content: center;
    margin-top: 3rem;
}

.contact-info {
    max-width: 500px;
    width: 100%;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem;
    background: var(--surface);
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
    margin-bottom: 1rem;
    text-align: left;
    transition: var(--transition);
}

.contact-item:hover {
    border-color: var(--accent);
}

.contact-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-muted);
    border-radius: var(--border-radius);
    color: var(--accent-light);
}

.contact-item h4 {
    font-size: 0.875rem;
    margin: 0 0 0.25rem;
}

.contact-item p,
.contact-item a {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin: 0;
}

.contact-item a:hover {
    color: var(--accent-light);
}

/* Footer */
footer {
    background: var(--secondary);
    padding: 3rem 5%;
    text-align: center;
    border-top: 1px solid var(--border);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.social-link {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--surface);
    color: var(--text-secondary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.social-link:hover {
    color: var(--accent-light);
    border-color: var(--accent);
}

footer p {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Popup Styles */
.popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.popup-overlay.active {
    opacity: 1;
    visibility: visible;
}

.popup-content {
    background: var(--surface);
    border-radius: var(--border-radius-lg);
    max-width: 700px;
    width: 90%;
    max-height: 85vh;
    overflow-y: auto;
    padding: 2rem;
    border: 1px solid var(--border);
    position: relative;
    animation: popupIn 0.3s ease;
}

@keyframes popupIn {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(10px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.close-popup {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
}

.close-popup:hover {
    color: var(--text);
}

.popup-content h4 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    padding-right: 2rem;
}

.popup-info {
    padding: 1rem;
    background: var(--card-bg);
    border-radius: var(--border-radius);
    border-left: 3px solid var(--accent);
    margin: 1rem 0;
}

.popup-info p {
    font-size: 0.875rem;
    margin: 0.25rem 0;
}

.activity-details-popup {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

/* Animation */
.animation-container {
    margin: 1.5rem 0;
    border-radius: var(--border-radius);
    overflow: hidden;
    border: 1px solid var(--border);
}

#robotArmCanvas {
    width: 100%;
    height: auto;
    display: block;
}

.animation-caption {
    padding: 0.75rem 1rem;
    background: var(--card-bg);
    font-size: 0.8125rem;
    color: var(--text-muted);
    text-align: center;
}

/* Fade In Animation */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Language Switch Button */
.lang-switch {
    padding: 0.25rem 0.75rem !important;
    border: 1px solid var(--accent) !important;
    border-radius: var(--border-radius) !important;
    font-size: 0.8125rem !important;
    color: var(--accent-light) !important;
    transition: var(--transition);
}

.lang-switch:hover {
    background: var(--accent-muted) !important;
    color: var(--text) !important;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .education-work-container {
        grid-template-columns: 1fr;
    }
    
    #about .profile {
        grid-template-columns: 200px 1fr;
    }
    
    .quick-stats {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    header {
        padding: 1rem 5%;
    }
    
    .hamburger {
        display: flex;
        z-index: 100;
    }
    
    header nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background: var(--secondary);
        display: flex;
        align-items: center;
        justify-content: center;
        transition: var(--transition);
        z-index: 99;
    }
    
    header nav.active {
        right: 0;
    }
    
    header nav ul {
        flex-direction: column;
        gap: 2rem;
    }
    
    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
    
    #hero h1 {
        font-size: 2rem;
    }
    
    section {
        padding: 4rem 5%;
    }
    
    #about .profile {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    #about .profile-image {
        width: 200px;
        margin: 0 auto;
    }
    
    .research-item {
        grid-template-columns: 1fr;
    }
    
    .research-date {
        margin-bottom: 0.5rem;
    }
    
    .award-item {
        grid-template-columns: 1fr;
    }
    
    .award-year {
        margin-bottom: 0.5rem;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    .popup-content {
        padding: 1.5rem;
        width: 95%;
    }
}

/* CV Page Styles */
.cv-page {
    padding-top: 100px;
    min-height: 100vh;
}

.cv-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 5%;
}

.cv-header {
    text-align: center;
    margin-bottom: 3rem;
}

.cv-header h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.cv-header p {
    color: var(--text-secondary);
}

.cv-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 2rem 0;
}

.cv-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--accent);
    color: white;
    font-weight: 500;
    border-radius: var(--border-radius);
    transition: var(--transition);
    text-decoration: none;
}

.cv-btn:hover {
    background: var(--accent-light);
    transform: translateY(-2px);
}

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

.cv-btn.secondary:hover {
    border-color: var(--accent);
    color: var(--accent-light);
}

.cv-preview {
    background: var(--surface);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border);
    overflow: hidden;
    margin-top: 2rem;
}

.cv-preview iframe,
.cv-preview embed {
    width: 100%;
    height: 800px;
    border: none;
}

/* Hero buttons container */
.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}