/* CSS Variables for Theme */
:root {
    /* Dark Theme Colors */
    --bg-primary: #000000;
    --bg-secondary: #0a0a0a;
    --bg-tertiary: #111111;
    --bg-card: #1a1a1a;
    --bg-overlay: rgba(0, 0, 0, 0.8);
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #e0e0e0;
    --text-muted: #a0a0a0;
    --text-accent: #6b7280;
    
    /* Accent Colors */
    --accent-primary: #6b7280;
    --accent-secondary: #9ca3af;
    --accent-gradient: linear-gradient(135deg, #6b7280 0%, #9ca3af 100%);
    --accent-tertiary: #d1d5db;
    --accent-quaternary: #e5e7eb;
    
    /* Border Colors */
    --border-primary: #333333;
    --border-secondary: #444444;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.6);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

/* Light Theme Colors */
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f1f3f4;
    --bg-card: #ffffff;
    --bg-overlay: rgba(255, 255, 255, 0.9);
    
    --text-primary: #1a1a1a;
    --text-secondary: #4a4a4a;
    --text-muted: #6b7280;
    
    --border-primary: #e5e7eb;
    --border-secondary: #d1d5db;
    
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.25);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: 3.5rem; font-weight: 700; }
h2 { font-size: 2.5rem; font-weight: 600; }
h3 { font-size: 1.75rem; font-weight: 600; }
h4 { font-size: 1.5rem; font-weight: 500; }

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

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

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

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-primary);
    transition: all var(--transition-normal);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    max-width: 1200px;
    margin: 0 auto;
}

.nav-brand a {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.brand-logo {
    width: 40px;
    height: 40px;
    object-fit: cover;
    transition: all var(--transition-fast);
}

.brand-logo:hover {
    transform: scale(1.1);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-menu a {
    color: var(--text-secondary);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-menu a:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.1);
}

.nav-toggle {
    display: none;
    cursor: pointer;
}

.hamburger {
    width: 24px;
    height: 20px;
    position: relative;
}

.hamburger span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    position: absolute;
    transition: all var(--transition-fast);
}

.hamburger span:nth-child(1) { top: 0; }
.hamburger span:nth-child(2) { top: 9px; }
.hamburger span:nth-child(3) { top: 18px; }

.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(7px, -6px);
}

/* Theme Toggle */
.theme-toggle button {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.theme-toggle button:hover {
    background: rgba(255, 255, 255, 0.1);
}

.sun-icon, .moon-icon {
    width: 20px;
    height: 20px;
    stroke-width: 2;
}

[data-theme="light"] .sun-icon,
[data-theme="dark"] .moon-icon {
    display: none;
}

/* Scroll Progress */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: var(--accent-gradient);
    z-index: 1001;
    transition: width var(--transition-fast);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    overflow: hidden;
    padding-top: 80px;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 80%, rgba(107, 114, 128, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(156, 163, 175, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.particles::before,
.particles::after {
    content: '';
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--accent-primary);
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
}

.particles::before {
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.particles::after {
    top: 60%;
    right: 20%;
    animation-delay: 3s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); opacity: 0.5; }
    50% { transform: translateY(-20px) rotate(180deg); opacity: 1; }
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
}

.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.4;
}

.hero-tagline {
    font-size: 1.1rem;
    color: var(--text-muted);
    font-style: italic;
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition-fast);
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--accent-primary);
}

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

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-primary);
}

.btn-secondary:hover {
    background: var(--border-primary);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--accent-primary);
    border: 2px solid var(--accent-primary);
    transition: all var(--transition-fast);
}

.btn-outline:hover {
    background: var(--accent-primary);
    color: white;
    transform: translateY(-2px);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    border: 1px solid var(--border-primary);
}

.social-links a:hover {
    color: var(--accent-primary);
    background: var(--bg-tertiary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.social-links svg {
    width: 24px;
    height: 24px;
}

.hero-image {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-image img {
    width: 100%;
    max-width: 400px;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    transition: transform var(--transition-normal);
    filter: drop-shadow(0 0 20px rgba(107, 114, 128, 0.3));
}

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

/* Company Marquee Section */
.company-marquee {
    padding: var(--spacing-lg) 0;
    background: var(--bg-primary);
    overflow: hidden;
}

.marquee-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.marquee-header h3 {
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 500;
}

.marquee-container {
    width: 100%;
    overflow: hidden;
    position: relative;
}

.marquee-content {
    display: flex;
    animation: marquee 30s linear infinite;
    width: max-content;
}

.marquee-item {
    flex-shrink: 0;
    margin: 0 var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.marquee-item img {
    height: 60px;
    width: auto;
    object-fit: contain;
    filter: brightness(0.9) contrast(1.2) opacity(0.9);
    transition: all var(--transition-fast);
    border-radius: var(--radius-sm);
}

.marquee-item img:hover {
    filter: brightness(1) contrast(1.2) opacity(1);
    transform: scale(1.1);
}

@keyframes marquee {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-50%);
    }
}

/* Section Headers */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-line {
    width: 80px;
    height: 4px;
    background: var(--accent-gradient);
    margin: 0 auto;
    border-radius: var(--radius-sm);
}

/* About Section */
.about {
    padding: var(--spacing-lg) 0;
    background: var(--bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.about-description {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
    color: var(--text-secondary);
}

.skills h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.skills-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.skill-tag {
    background: var(--bg-card);
    color: var(--text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    border: 1px solid var(--border-primary);
    transition: all var(--transition-fast);
}

.skill-tag:hover {
    background: var(--accent-gradient);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.experience-highlights {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.highlight-tile {
    background: var(--bg-card);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-primary);
    text-align: center;
    flex: 1;
    transition: all var(--transition-fast);
}

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

.highlight-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-primary);
    margin-bottom: var(--spacing-xs);
}

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

.about-image img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-normal);
}

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

/* Projects Section */
.projects {
    padding: var(--spacing-lg) 0;
    background: var(--bg-primary);
}

.projects-hero {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.projects-hero img {
    width: 100%;
    max-width: 800px;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.project-card {
    background: var(--bg-card);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-primary);
    text-align: center;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--accent-secondary);
}

.project-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--spacing-sm);
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-primary);
}

.project-icon svg {
    width: 24px;
    height: 24px;
}

.project-card h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    font-size: 1.2rem;
}

.project-card p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Experience Section */
.experience {
    padding: var(--spacing-lg) 0;
    background: var(--bg-secondary);
}

.experience-timeline {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.experience-timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent-primary), var(--accent-secondary));
    border-radius: 1px;
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: flex-start;
}

.timeline-marker {
    position: relative;
    flex-shrink: 0;
    width: 60px;
    margin-right: var(--spacing-lg);
}

.marker-dot {
    width: 16px;
    height: 16px;
    background: var(--accent-primary);
    border-radius: 50%;
    border: 4px solid var(--bg-secondary);
    box-shadow: var(--shadow-md);
    z-index: 2;
    position: relative;
}

.marker-line {
    display: none;
}

.timeline-content {
    flex: 1;
    background: var(--bg-card);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-primary);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    position: relative;
    display: flex;
    gap: var(--spacing-lg);
}

.timeline-content::before {
    content: '';
    position: absolute;
    left: -10px;
    top: 20px;
    width: 0;
    height: 0;
    border-top: 10px solid transparent;
    border-bottom: 10px solid transparent;
    border-right: 10px solid var(--bg-card);
}

.timeline-left {
    flex: 0 0 35%;
    padding-right: var(--spacing-md);
    border-right: 1px solid var(--border-primary);
}

.timeline-right {
    flex: 1;
    padding-left: var(--spacing-md);
}

.timeline-content:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-secondary);
}

.timeline-left h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    font-size: 1.4rem;
    font-weight: 600;
    line-height: 1.2;
}

.company {
    display: block;
    color: var(--accent-primary);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    font-size: 1rem;
}

.period {
    display: block;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 0;
    line-height: 1.4;
}

.timeline-achievements {
    list-style: none;
}

.timeline-achievements li {
    position: relative;
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.95rem;
}

.timeline-achievements li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-weight: bold;
}

/* Academics Section */
.academics {
    padding: var(--spacing-lg) 0;
    background: var(--bg-primary);
}

.academics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.academic-card {
    background: var(--bg-card);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-primary);
    text-align: center;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

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

.academic-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--spacing-sm);
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-primary);
}

.academic-icon svg {
    width: 24px;
    height: 24px;
    stroke-width: 2;
}

.academic-card h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    font-size: 1.1rem;
}

.academic-card p {
    color: var(--text-secondary);
    font-size: 0.8rem;
}

/* Contact Section */
.contact {
    padding: var(--spacing-lg) 0;
    background: var(--bg-secondary);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

.contact-info h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.contact-info p {
    margin-bottom: var(--spacing-lg);
    color: var(--text-secondary);
    line-height: 1.6;
}

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

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--bg-card);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-primary);
    transition: all var(--transition-fast);
}

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

.contact-item svg {
    width: 20px;
    height: 20px;
    color: var(--accent-primary);
    flex-shrink: 0;
}

.contact-item a {
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

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

/* Contact Form */
.contact-form {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-primary);
    box-shadow: var(--shadow-md);
}

.form-group {
    position: relative;
    margin-bottom: var(--spacing-lg);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm);
    background: var(--bg-tertiary);
    border: 2px solid var(--border-primary);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all var(--transition-fast);
    font-family: inherit;
}

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

.form-group label {
    position: absolute;
    left: var(--spacing-sm);
    top: var(--spacing-sm);
    color: var(--text-muted);
    transition: all var(--transition-fast);
    pointer-events: none;
    background: var(--bg-tertiary);
    padding: 0 var(--spacing-xs);
}

.form-group input:focus + label,
.form-group input:valid + label,
.form-group textarea:focus + label,
.form-group textarea:valid + label {
    top: -10px;
    left: var(--spacing-sm);
    font-size: 0.8rem;
    color: var(--accent-primary);
    background: var(--bg-card);
}

/* Footer */
.footer {
    background: var(--bg-tertiary);
    padding: var(--spacing-lg) 0 var(--spacing-md);
    border-top: 1px solid var(--border-primary);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.footer-brand h3 {
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.footer-brand p {
    color: var(--text-muted);
    margin-bottom: 0;
}

.footer-social {
    display: flex;
    gap: var(--spacing-md);
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    border: 1px solid var(--border-primary);
}

.footer-social a:hover {
    color: var(--accent-primary);
    background: var(--bg-secondary);
    transform: translateY(-2px);
}

.footer-social svg {
    width: 20px;
    height: 20px;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-primary);
}

.footer-bottom p {
    color: var(--text-muted);
    margin-bottom: 0;
    font-size: 0.9rem;
}

/* Cursor Effects */
.cursor {
    position: fixed;
    width: 20px;
    height: 20px;
    background: var(--accent-primary);
    border-radius: 50%;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.8;
    transition: transform var(--transition-fast);
    mix-blend-mode: difference;
}

.cursor-follower {
    position: fixed;
    width: 8px;
    height: 8px;
    background: var(--accent-secondary);
    border-radius: 50%;
    pointer-events: none;
    z-index: 9998;
    opacity: 0.6;
    transition: transform var(--transition-slow);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-lg);
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-lg);
    }
    
    .experience-highlights {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .experience-timeline {
        padding: 0 var(--spacing-sm);
    }
    
    .timeline-item {
        margin-bottom: var(--spacing-md);
    }
    
    .timeline-marker {
        margin-right: var(--spacing-md);
    }
    
    .timeline-content {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .timeline-left {
        flex: none;
        padding-right: 0;
        border-right: none;
        border-bottom: 1px solid var(--border-primary);
        padding-bottom: var(--spacing-sm);
    }
    
    .timeline-right {
        padding-left: 0;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        flex-direction: column;
        padding: var(--spacing-md);
        border-top: 1px solid var(--border-primary);
        box-shadow: var(--shadow-lg);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-toggle {
        display: block;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .experience-timeline {
        padding: 0 var(--spacing-sm);
    }
    
    .timeline-item {
        margin-bottom: var(--spacing-sm);
    }
    
    .timeline-marker {
        margin-right: var(--spacing-sm);
    }
    
    .timeline-content {
        padding: var(--spacing-sm);
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .timeline-left {
        flex: none;
        padding-right: 0;
        border-right: none;
        border-bottom: 1px solid var(--border-primary);
        padding-bottom: var(--spacing-xs);
    }
    
    .timeline-right {
        padding-left: 0;
    }
    
    .academics-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .btn {
        padding: var(--spacing-sm);
        font-size: 0.9rem;
    }
    
    .timeline-content {
        padding: var(--spacing-sm);
    }
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Intersection Observer Animations */
.fade-in-up {
    animation: fadeInUp 0.8s ease-out forwards;
}

.fade-in-left {
    animation: fadeInLeft 0.8s ease-out forwards;
}

.fade-in-right {
    animation: fadeInRight 0.8s ease-out forwards;
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Focus States for Accessibility */
button:focus,
input:focus,
textarea:focus,
a:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}