/* ==================== VS CODE THEME ==================== */
:root {
    /* Light Theme (VS Code Light+) */
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-tertiary: #e8e8e8;
    --bg-header: #f3f3f3;
    --bg-card: #ffffff;
    --bg-code: #f5f5f5;

    --text-primary: #1a1a1a;
    --text-secondary: #4a4a4a;
    --text-muted: #6b6b6b;

    --border-color: #d4d4d4;
    --border-light: #e8e8e8;

    /* VS Code Syntax Colors - Enhanced for light mode readability */
    --syntax-blue: #0055a4;
    --syntax-green: #067a4e;
    --syntax-orange: #b85800;
    --syntax-cyan: #006d6d;
    --syntax-purple: #6b4d1f;
    --syntax-red: #b32626;
    --syntax-string: #9c1212;

    --accent: #0078d4;
    --accent-hover: #106ebe;

    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);

    --radius: 6px;
    --radius-lg: 10px;
    --transition: 0.15s ease;

    --header-height: 40px;
    --footer-height: 24px;
}

[data-theme="dark"] {
    /* Dark Theme (VS Code Dark+) */
    --bg-primary: #1e1e1e;
    --bg-secondary: #252526;
    --bg-tertiary: #2d2d2d;
    --bg-header: #323233;
    --bg-card: #252526;
    --bg-code: #1e1e1e;

    --text-primary: #cccccc;
    --text-secondary: #9d9d9d;
    --text-muted: #6e6e6e;

    --border-color: #404040;
    --border-light: #333333;

    --syntax-blue: #569cd6;
    --syntax-green: #6a9955;
    --syntax-orange: #ce9178;
    --syntax-cyan: #4ec9b0;
    --syntax-purple: #c586c0;
    --syntax-red: #f44747;
    --syntax-string: #ce9178;

    --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
}

/* ==================== RESET & BASE ==================== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background var(--transition), color var(--transition);
}

::selection {
    background: var(--accent);
    color: white;
}

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

img {
    max-width: 100%;
    display: block;
}

/* ==================== TYPOGRAPHY ==================== */
h1, h2, h3, h4 {
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: -0.02em;
}

h1 { font-size: clamp(2rem, 5vw, 3rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
h3 { font-size: 1.125rem; }

.mono {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

/* ==================== VS CODE HEADER ==================== */
.vscode-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--bg-header);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 12px;
    z-index: 1000;
    gap: 12px;
}

.window-controls {
    display: flex;
    gap: 8px;
    padding-right: 12px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red { background: #ff5f56; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #27ca40; }

.file-tabs {
    display: flex;
    flex: 1;
    gap: 2px;
    overflow-x: auto;
    scrollbar-width: none;
}

.file-tabs::-webkit-scrollbar {
    display: none;
}

.tab {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    background: transparent;
    border-radius: 4px 4px 0 0;
    white-space: nowrap;
    transition: all var(--transition);
    font-family: 'JetBrains Mono', monospace;
}

.tab:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.tab.active {
    color: var(--text-primary);
    background: var(--bg-primary);
    border-bottom: 2px solid var(--accent);
}

.tab-icon {
    font-size: 0.9rem;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.theme-btn, .github-btn {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: 4px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
}

.theme-btn:hover, .github-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* ==================== MOBILE NAV ==================== */
.mobile-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-header);
    border-top: 1px solid var(--border-color);
    padding: 8px 16px;
    z-index: 1000;
    justify-content: space-around;
}

.mobile-nav-item {
    font-size: 0.75rem;
    color: var(--text-secondary);
    padding: 8px 12px;
    border-radius: var(--radius);
    transition: all var(--transition);
}

.mobile-nav-item.active,
.mobile-nav-item:hover {
    color: var(--accent);
    background: var(--bg-tertiary);
}

/* ==================== MAIN CONTENT ==================== */
main {
    flex: 1;
    margin-top: var(--header-height);
    padding-bottom: var(--footer-height);
}

section {
    padding: 60px 24px;
    max-width: 1100px;
    margin: 0 auto;
}

/* ==================== HERO ==================== */
.hero {
    min-height: calc(100vh - var(--header-height) - var(--footer-height) - 120px);
    display: flex;
    align-items: center;
    padding-top: 40px;
    padding-bottom: 40px;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    width: 100%;
}

.hero-intro {
    max-width: 500px;
}

.status-indicator {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    background: var(--bg-secondary);
    border-radius: 20px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.status-dot {
    width: 8px;
    height: 8px;
    background: #27ca40;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    overflow: hidden;
    border: 3px solid var(--accent);
    box-shadow: var(--shadow-lg);
    margin-bottom: 20px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hero-avatar:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 32px rgba(0, 120, 212, 0.3);
}

.hero-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center top;
    transform: scale(0.82);
}

.hero-name {
    margin-bottom: 8px;
}

.hero-title {
    font-size: 1.25rem;
    color: var(--syntax-cyan);
    font-family: 'JetBrains Mono', monospace;
    margin-bottom: 16px;
}

.hero-tagline {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 28px;
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: 12px;
}

.btn-primary, .btn-secondary {
    padding: 12px 24px;
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition);
    cursor: pointer;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

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

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

/* Hero Terminal */
.hero-terminal {
    background: var(--bg-code);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.terminal-bar {
    background: var(--bg-header);
    padding: 10px 16px;
    border-bottom: 1px solid var(--border-color);
}

.terminal-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.terminal-content {
    padding: 20px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    line-height: 1.7;
}

.terminal-line {
    margin-bottom: 8px;
}

.prompt {
    color: var(--syntax-green);
    margin-right: 8px;
}

.command {
    color: var(--syntax-cyan);
}

.terminal-output {
    margin: 0;
    white-space: pre;
}

.key { color: var(--syntax-blue); }
.string { color: var(--syntax-string); }
.number { color: var(--syntax-green); }

/* ==================== STATS ==================== */
.stats-section {
    padding-top: 0;
    padding-bottom: 40px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
    transition: all var(--transition);
}

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

.stat-number {
    font-family: 'JetBrains Mono', monospace;
    font-size: 2rem;
    font-weight: 600;
    color: var(--syntax-cyan);
    display: block;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* ==================== FEATURED WORK ==================== */
.featured-section {
    background: var(--bg-secondary);
    margin: 0;
    max-width: none;
    padding: 60px 24px;
}

.featured-section > * {
    max-width: 1100px;
    margin: 0 auto;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
}

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

.see-all:hover {
    color: var(--accent-hover);
}

.featured-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    max-width: 1100px;
}

.featured-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: all var(--transition);
    display: block;
}

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

.featured-main {
    grid-row: span 2;
    display: flex;
    flex-direction: column;
}

.featured-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--syntax-green);
    margin-bottom: 12px;
}

.featured-card h3 {
    margin-bottom: 12px;
    color: var(--text-primary);
}

.featured-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    flex: 1;
}

.featured-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 20px;
}

.featured-tech span {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    padding: 4px 10px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    color: var(--syntax-cyan);
}

/* ==================== EXPERTISE ==================== */
.expertise-section h2 {
    text-align: center;
    margin-bottom: 40px;
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.expertise-card {
    text-align: center;
    padding: 32px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all var(--transition);
}

.expertise-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
}

.expertise-icon {
    font-size: 2rem;
    margin-bottom: 16px;
}

.expertise-card h3 {
    margin-bottom: 8px;
    font-size: 1rem;
}

.expertise-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.availability-grid {
    grid-template-columns: repeat(3, 1fr);
    max-width: 800px;
    margin: 0 auto;
}

/* ==================== CURRENT FOCUS ==================== */
.current-section {
    background: var(--bg-secondary);
    margin: 0;
    max-width: none;
}

.current-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    max-width: 1100px;
    margin: 0 auto;
}

.current-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--syntax-green);
    display: block;
    margin-bottom: 12px;
}

.current-text h2 {
    margin-bottom: 16px;
}

.current-text p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.link-arrow {
    color: var(--accent);
    font-weight: 500;
    transition: color var(--transition);
}

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

.current-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.current-image img {
    width: 100%;
    height: 300px;
    object-fit: cover;
}

/* ==================== CONNECT ==================== */
.connect-section {
    text-align: center;
}

.connect-section h2 {
    margin-bottom: 12px;
}

.connect-section > p {
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.connect-links {
    display: flex;
    justify-content: center;
    gap: 16px;
}

.connect-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 24px 40px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all var(--transition);
}

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

.connect-icon {
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.connect-icon svg {
    width: 24px;
    height: 24px;
    fill: currentColor;
}

.connect-label {
    font-size: 0.9rem;
    font-weight: 500;
}

/* ==================== VS CODE FOOTER ==================== */
.vscode-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--footer-height);
    background: var(--accent);
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 12px;
    font-size: 0.7rem;
    z-index: 1000;
}

.footer-left, .footer-right {
    display: flex;
    gap: 16px;
}

.footer-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.footer-icon {
    font-size: 0.8rem;
}

/* ==================== PAGE SPECIFIC: ABOUT ==================== */
.page-header {
    margin-bottom: 48px;
}

.page-title {
    margin-bottom: 8px;
}

.page-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.about-grid {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 60px;
    margin-bottom: 60px;
    align-items: start;
}

.about-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
    position: sticky;
    top: 60px;
}

.about-image img {
    width: 100%;
    height: auto;
    display: block;
}

.about-content h2 {
    margin-bottom: 16px;
    font-size: 1.5rem;
}

.about-content p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.8;
}

/* Timeline */
.timeline {
    position: relative;
    padding-left: 24px;
    border-left: 2px solid var(--border-color);
}

.timeline-item {
    position: relative;
    padding-bottom: 32px;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: -29px;
    top: 4px;
    width: 12px;
    height: 12px;
    background: var(--accent);
    border-radius: 50%;
    border: 2px solid var(--bg-primary);
}

.timeline-date {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--syntax-green);
    margin-bottom: 4px;
}

.timeline-title {
    font-weight: 600;
    margin-bottom: 4px;
}

.timeline-company {
    color: var(--syntax-blue);
    font-size: 0.9rem;
    margin-bottom: 8px;
}

.timeline-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* Skills */
.skills-section h2 {
    margin-bottom: 32px;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.skill-category {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.skill-category h3 {
    font-size: 0.9rem;
    margin-bottom: 16px;
    color: var(--syntax-blue);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-tag {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    padding: 6px 12px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    color: var(--text-primary);
}

/* ==================== PAGE SPECIFIC: PROJECTS ==================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

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

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

.project-header {
    background: var(--bg-header);
    padding: 12px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.project-file {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.project-status {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    padding: 3px 8px;
    border-radius: 4px;
    background: rgba(39, 202, 64, 0.15);
    color: #27ca40;
}

.project-body {
    padding: 24px;
}

.project-card h3 {
    margin-bottom: 12px;
}

.project-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 16px;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.project-tech span {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    padding: 4px 10px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    color: var(--syntax-cyan);
}

.project-links {
    display: flex;
    gap: 16px;
}

.project-link {
    font-size: 0.85rem;
    color: var(--accent);
    transition: color var(--transition);
}

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

/* ==================== PAGE SPECIFIC: RESEARCH ==================== */
.research-intro {
    max-width: 700px;
    margin-bottom: 48px;
}

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

.publications-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.publication-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px;
    display: grid;
    grid-template-columns: 48px 1fr;
    gap: 20px;
    transition: all var(--transition);
}

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

.publication-number {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--syntax-blue);
}

.publication-content h3 {
    margin-bottom: 8px;
}

.publication-meta {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.publication-abstract {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
    margin-bottom: 12px;
}

.publication-status {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    padding: 4px 10px;
    border-radius: 4px;
    background: rgba(255, 189, 46, 0.15);
    color: #e5a500;
    display: inline-block;
}

/* ==================== PAGE SPECIFIC: CONTACT ==================== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info h2 {
    margin-bottom: 16px;
}

.contact-info > p {
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.8;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-method {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    transition: all var(--transition);
}

.contact-method:hover {
    border-color: var(--accent);
    transform: translateX(4px);
}

.contact-method-icon {
    font-size: 1.25rem;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius);
    color: var(--text-primary);
}

.contact-method-icon svg {
    width: 24px;
    height: 24px;
    fill: currentColor;
}

.contact-method-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.contact-method-value {
    font-weight: 500;
}

.contact-form-wrapper {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.form-header {
    background: var(--bg-header);
    padding: 12px 20px;
    border-bottom: 1px solid var(--border-color);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.contact-form {
    padding: 28px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    padding: 12px 16px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 0.9rem;
    color: var(--text-primary);
    transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.form-group textarea {
    min-height: 120px;
    resize: vertical;
}

.form-submit {
    padding: 14px 28px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
}

.form-submit:hover {
    background: var(--accent-hover);
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-terminal {
        max-width: 500px;
    }

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

    .featured-main {
        grid-row: span 1;
    }

    .expertise-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .current-content {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .current-image {
        order: -1;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .about-image {
        max-width: 320px;
        position: static;
    }

    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .vscode-header {
        display: none;
    }

    .mobile-nav {
        display: flex;
    }

    main {
        margin-top: 0;
        padding-bottom: 80px;
    }

    .vscode-footer {
        display: none;
    }

    section {
        padding: 48px 20px;
    }

    .hero {
        min-height: auto;
        padding-top: 40px;
    }

    .hero-avatar {
        width: 90px;
        height: 90px;
    }

    .hero-terminal {
        font-size: 0.8rem;
    }

    .terminal-content {
        padding: 16px;
        overflow-x: auto;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .availability-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }

    .expertise-card h3 {
        font-size: 0.95rem;
        word-wrap: break-word;
    }

    .expertise-card p {
        font-size: 0.8rem;
    }

    .connect-links {
        flex-direction: column;
        align-items: center;
    }

    .connect-card {
        width: 100%;
        max-width: 300px;
    }

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

    .publication-card {
        grid-template-columns: 1fr;
    }

    .about-image {
        max-width: 250px;
        margin: 0 auto;
    }

    .featured-grid {
        gap: 16px;
    }

    .featured-card {
        padding: 20px;
    }

    .timeline {
        padding-left: 20px;
    }

    .timeline-dot {
        left: -25px;
        width: 10px;
        height: 10px;
    }
}

@media (max-width: 480px) {
    .hero-cta {
        flex-direction: column;
    }

    .btn-primary, .btn-secondary {
        width: 100%;
        text-align: center;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }

    .stat-card {
        padding: 20px 16px;
    }

    .stat-number {
        font-size: 1.5rem;
    }
}

/* ==================== PAGE LOAD ANIMATION ==================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

body {
    animation: fadeIn 0.3s ease-out;
}

.hero-intro,
.hero-terminal,
.page-header,
.about-grid,
.contact-grid {
    animation: fadeInUp 0.5s ease-out forwards;
}

.hero-terminal {
    animation-delay: 0.1s;
}

.stat-card,
.featured-card,
.expertise-card,
.project-card,
.publication-card,
.skill-category,
.timeline-item,
.connect-card {
    opacity: 0;
    animation: fadeInUp 0.4s ease-out forwards;
}

.stat-card:nth-child(1) { animation-delay: 0.1s; }
.stat-card:nth-child(2) { animation-delay: 0.15s; }
.stat-card:nth-child(3) { animation-delay: 0.2s; }
.stat-card:nth-child(4) { animation-delay: 0.25s; }

.featured-card:nth-child(1) { animation-delay: 0.1s; }
.featured-card:nth-child(2) { animation-delay: 0.15s; }
.featured-card:nth-child(3) { animation-delay: 0.2s; }

.expertise-card:nth-child(1) { animation-delay: 0.1s; }
.expertise-card:nth-child(2) { animation-delay: 0.15s; }
.expertise-card:nth-child(3) { animation-delay: 0.2s; }
.expertise-card:nth-child(4) { animation-delay: 0.25s; }

.project-card:nth-child(1) { animation-delay: 0.1s; }
.project-card:nth-child(2) { animation-delay: 0.15s; }
.project-card:nth-child(3) { animation-delay: 0.2s; }
.project-card:nth-child(4) { animation-delay: 0.25s; }

.publication-card:nth-child(1) { animation-delay: 0.1s; }
.publication-card:nth-child(2) { animation-delay: 0.15s; }
.publication-card:nth-child(3) { animation-delay: 0.2s; }
.publication-card:nth-child(4) { animation-delay: 0.25s; }

.skill-category:nth-child(1) { animation-delay: 0.1s; }
.skill-category:nth-child(2) { animation-delay: 0.15s; }
.skill-category:nth-child(3) { animation-delay: 0.2s; }
.skill-category:nth-child(4) { animation-delay: 0.25s; }
.skill-category:nth-child(5) { animation-delay: 0.3s; }
.skill-category:nth-child(6) { animation-delay: 0.35s; }

.timeline-item:nth-child(1) { animation-delay: 0.1s; }
.timeline-item:nth-child(2) { animation-delay: 0.2s; }
.timeline-item:nth-child(3) { animation-delay: 0.3s; }
.timeline-item:nth-child(4) { animation-delay: 0.4s; }
.timeline-item:nth-child(5) { animation-delay: 0.5s; }

.connect-card:nth-child(1) { animation-delay: 0.1s; }
.connect-card:nth-child(2) { animation-delay: 0.15s; }
.connect-card:nth-child(3) { animation-delay: 0.2s; }

/* ==================== 404 PAGE ==================== */
.error-section {
    min-height: calc(100vh - var(--header-height) - var(--footer-height) - 120px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 60px 24px;
}

.error-content {
    max-width: 800px;
    width: 100%;
}

.error-terminal {
    background: var(--bg-code);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    margin-bottom: 40px;
    animation: fadeInUp 0.5s ease-out;
}

.error-message {
    text-align: center;
    animation: fadeInUp 0.5s ease-out 0.1s forwards;
    opacity: 0;
}

.error-code {
    font-family: 'JetBrains Mono', monospace;
    font-size: clamp(4rem, 12vw, 8rem);
    font-weight: 700;
    color: var(--syntax-red);
    line-height: 1;
    margin-bottom: 16px;
    text-shadow: 0 4px 24px rgba(199, 46, 47, 0.3);
}

.error-message h2 {
    margin-bottom: 12px;
    color: var(--text-primary);
}

.error-message > p {
    color: var(--text-secondary);
    max-width: 400px;
    margin: 0 auto 32px;
    line-height: 1.7;
}

.error-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 40px;
}

.error-suggestions {
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.error-links {
    display: flex;
    gap: 24px;
    justify-content: center;
}

.error-links a {
    color: var(--accent);
    font-size: 0.9rem;
    transition: color var(--transition);
}

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

@media (max-width: 768px) {
    .error-section {
        min-height: auto;
        padding: 80px 20px;
    }

    .error-actions {
        flex-direction: column;
        align-items: center;
    }

    .error-actions .btn-primary,
    .error-actions .btn-secondary {
        width: 100%;
        max-width: 280px;
        text-align: center;
    }

    .error-links {
        flex-wrap: wrap;
    }
}