/* ===================================
   CSS Variables & Design Tokens
   =================================== */
:root {
    /* Dark Mode Colors (Default) */
    --color-bg-primary: #0a0e27;
    --color-bg-secondary: #151a35;
    --color-bg-tertiary: #1a2040;
    --color-text-primary: #ffffff;
    --color-text-secondary: #b4b9d6;
    --color-text-muted: #7a7f9d;

    /* Accent Colors */
    --color-accent-cyan: #00d9ff;
    --color-accent-purple: #a855f7;
    --color-accent-pink: #ec4899;
    --color-accent-blue: #3b82f6;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-accent-cyan) 0%, var(--color-accent-purple) 100%);
    --gradient-secondary: linear-gradient(135deg, var(--color-accent-purple) 0%, var(--color-accent-pink) 100%);
    --gradient-accent: linear-gradient(135deg, var(--color-accent-blue) 0%, var(--color-accent-cyan) 100%);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Space Grotesk', var(--font-primary);

    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 4rem;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 40px rgba(0, 217, 255, 0.3);

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;

    /* Z-index */
    --z-navbar: 1000;
    --z-modal: 2000;
}

/* Light Mode Variables */
[data-theme="light"] {
    --color-bg-primary: #f8f9fa;
    --color-bg-secondary: #ffffff;
    --color-bg-tertiary: #e9ecef;
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #4a5568;
    --color-text-muted: #718096;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.15);
    --shadow-glow: 0 0 40px rgba(0, 217, 255, 0.2);
}

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-base);
}

ul {
    list-style: none;
}

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

/* ===================================
   Scroll Progress Bar
   =================================== */
#scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 4px;
    background: var(--gradient-primary);
    z-index: calc(var(--z-navbar) + 1);
    transition: width var(--transition-fast);
}

/* ===================================
   Navigation
   =================================== */
#navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 14, 39, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    z-index: var(--z-navbar);
    transition: all var(--transition-base);
}

#navbar.scrolled {
    background: rgba(10, 14, 39, 0.95);
    box-shadow: var(--shadow-lg);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-logo {
    font-family: var(--font-heading);
    font-size: var(--font-size-2xl);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    position: relative;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    transition: color var(--transition-base);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 80%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-toggle span {
    width: 25px;
    height: 2px;
    background: var(--color-text-primary);
    transition: all var(--transition-base);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: var(--spacing-3xl) var(--spacing-lg) calc(var(--spacing-3xl) + 80px);
}

.hero-background {
    position: absolute;
    inset: 0;
    overflow: hidden;
    z-index: 0;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: var(--color-accent-cyan);
    top: -10%;
    right: -10%;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: var(--color-accent-purple);
    bottom: -10%;
    left: -5%;
    animation-delay: 5s;
}

.orb-3 {
    width: 350px;
    height: 350px;
    background: var(--color-accent-pink);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: 10s;
}

@keyframes float {

    0%,
    100% {
        transform: translate(0, 0) scale(1);
    }

    33% {
        transform: translate(30px, -30px) scale(1.1);
    }

    66% {
        transform: translate(-20px, 20px) scale(0.9);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 900px;
    text-align: center;
    margin-top: 40px;
    /* Increased margin for top spacing */
}

.hero-greeting {
    font-size: var(--font-size-lg);
    color: var(--color-accent-cyan);
    margin-bottom: var(--spacing-sm);
    animation: fadeInUp 0.6s ease;
}

.hero-name {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 8vw, var(--font-size-6xl));
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 0.6s ease 0.2s backwards;
}

.hero-title {
    font-size: clamp(1.25rem, 4vw, var(--font-size-3xl));
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    min-height: 3rem;
    animation: fadeInUp 0.6s ease 0.4s backwards;
}

.typing-text {
    color: var(--color-accent-purple);
}

.cursor {
    animation: blink 1s step-end infinite;
}

@keyframes blink {

    0%,
    50% {
        opacity: 1;
    }

    51%,
    100% {
        opacity: 0;
    }
}

.hero-description {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.8;
    animation: fadeInUp 0.6s ease 0.6s backwards;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.6s ease 0.8s backwards;
}

.hero-social {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    animation: fadeInUp 0.6s ease 1s backwards;
}

.social-link {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    transition: all var(--transition-base);
}

.social-link:hover {
    background: var(--gradient-primary);
    color: var(--color-text-primary);
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow);
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    animation: fadeIn 1s ease 1.2s backwards;
    z-index: 0;
}

@media (max-width: 768px) {
    .scroll-indicator {
        bottom: var(--spacing-md);
    }
}

@media (max-width: 480px),
(min-height: 800px) and (max-width: 768px) {
    .scroll-indicator {
        display: none;
    }
}

.mouse {
    width: 24px;
    height: 40px;
    border: 2px solid var(--color-text-muted);
    border-radius: 12px;
    position: relative;
}

.wheel {
    width: 4px;
    height: 8px;
    background: var(--color-text-muted);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 2s ease-in-out infinite;
}

@keyframes scroll {
    0% {
        transform: translate(-50%, 0);
        opacity: 1;
    }

    100% {
        transform: translate(-50%, 16px);
        opacity: 0;
    }
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-full);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.1);
    transform: translateX(-100%);
    transition: transform var(--transition-base);
}

.btn:hover::before {
    transform: translateX(0);
}

.btn span,
.btn i {
    position: relative;
    z-index: 1;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--color-text-primary);
}

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

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--color-text-primary);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

/* ===================================
   Sections
   =================================== */
.section {
    padding: var(--spacing-3xl) var(--spacing-lg);
    position: relative;
}

.section-dark {
    background-color: var(--color-bg-secondary);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-label {
    display: inline-block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-accent-cyan);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: var(--spacing-sm);
}

.section-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 5vw, var(--font-size-4xl));
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 0 auto;
}

.section-subtitle a {
    color: var(--color-accent-cyan);
    text-decoration: underline;
}

.section-subtitle a:hover {
    color: var(--color-accent-purple);
}

/* ===================================
   About Section
   =================================== */
.about-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-3xl);
}

.about-text {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.about-text p {
    margin-bottom: var(--spacing-lg);
}

.about-intro {
    font-size: var(--font-size-xl);
    color: var(--color-text-primary);
}

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

.stat-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all var(--transition-base);
}

.stat-card:hover {
    background: rgba(255, 255, 255, 0.05);
    transform: translateY(-5px);
    border-color: var(--color-accent-cyan);
}

.stat-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: var(--gradient-primary);
    font-size: var(--font-size-2xl);
}

.stat-number {
    font-family: var(--font-heading);
    font-size: var(--font-size-4xl);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
}

.subsection-title {
    font-family: var(--font-heading);
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-xl);
    color: var(--color-text-primary);
}

.certifications,
.publications {
    margin-bottom: var(--spacing-3xl);
}

.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.cert-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    transition: all var(--transition-base);
}

.cert-item:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--color-accent-cyan);
    transform: translateX(5px);
}

.cert-item i {
    color: var(--color-accent-cyan);
    font-size: var(--font-size-lg);
}

.publication-list {
    display: grid;
    gap: var(--spacing-lg);
}

.publication-card {
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.publication-card:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--color-accent-purple);
    transform: translateY(-5px);
}

.pub-icon {
    width: 60px;
    height: 60px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: var(--gradient-secondary);
    font-size: var(--font-size-2xl);
}

.pub-content h4 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.pub-content p {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ===================================
   Timeline (Experience)
   =================================== */
.timeline {
    position: relative;
    padding-left: var(--spacing-xl);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--color-accent-cyan), var(--color-accent-purple), var(--color-accent-pink));
}

.timeline-item {
    position: relative;
    padding-bottom: var(--spacing-3xl);
}

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

.timeline-dot {
    position: absolute;
    left: calc(-1 * var(--spacing-xl) - 6px);
    top: 0;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--gradient-primary);
    box-shadow: 0 0 0 4px var(--color-bg-secondary), 0 0 20px var(--color-accent-cyan);
}

.timeline-content {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: all var(--transition-base);
}

.timeline-content:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--color-accent-cyan);
    transform: translateX(10px);
}

.timeline-date {
    display: inline-block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-accent-cyan);
    background: rgba(0, 217, 255, 0.1);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-md);
}

.timeline-title {
    font-family: var(--font-heading);
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.timeline-company {
    font-size: var(--font-size-xl);
    color: var(--color-accent-purple);
    margin-bottom: var(--spacing-md);
}

.timeline-description {
    list-style: disc;
    padding-left: var(--spacing-lg);
    color: var(--color-text-secondary);
}

.timeline-description li {
    margin-bottom: var(--spacing-sm);
    line-height: 1.6;
}

/* ===================================
   Projects Grid
   =================================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.project-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--color-accent-cyan);
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.project-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.project-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: var(--gradient-primary);
    font-size: var(--font-size-xl);
    flex-shrink: 0;
}

.project-title {
    font-family: var(--font-heading);
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
}

.project-description {
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    flex-grow: 1;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.tag {
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--color-accent-cyan);
    background: rgba(0, 217, 255, 0.1);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-full);
}

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

.project-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-accent-cyan);
    transition: color var(--transition-base);
}

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

/* ===================================
   Articles Grid
   =================================== */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.article-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--color-accent-purple);
    transform: translateY(-10px);
}

.article-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: var(--gradient-secondary);
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
}

.article-title {
    font-family: var(--font-heading);
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
    line-height: 1.4;
}

.article-excerpt {
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    flex-grow: 1;
}

.article-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    color: var(--color-accent-purple);
    transition: all var(--transition-base);
}

.article-link:hover {
    color: var(--color-accent-pink);
    gap: var(--spacing-md);
}

/* ===================================
   Open Source Grid
   =================================== */
.opensource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.repo-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.repo-card:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--color-accent-cyan);
    transform: translateY(-5px);
}

.repo-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.repo-header i {
    font-size: var(--font-size-2xl);
    color: var(--color-text-secondary);
}

.repo-header h3 {
    font-family: var(--font-heading);
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
}

.repo-card p {
    color: var(--color-text-secondary);
    line-height: 1.6;
    flex-grow: 1;
}

.repo-footer {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.repo-lang {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.repo-lang i {
    font-size: 10px;
    color: var(--color-accent-cyan);
}

.github-cta {
    text-align: center;
}

/* ===================================
   Contact Section
   =================================== */
.contact-content {
    max-width: 900px;
    margin: 0 auto;
}

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

.contact-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all var(--transition-base);
}

.contact-card:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--color-accent-cyan);
    transform: translateY(-10px);
}

.contact-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: var(--gradient-primary);
    font-size: var(--font-size-3xl);
}

.contact-card h3 {
    font-family: var(--font-heading);
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.contact-card a {
    color: var(--color-accent-cyan);
    font-size: var(--font-size-base);
    transition: color var(--transition-base);
}

.contact-card a:hover {
    color: var(--color-accent-purple);
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-xl) var(--spacing-lg);
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-left {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-content p {
    color: var(--color-text-muted);
}

.visitor-counter {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(0, 217, 255, 0.1);
    border-radius: var(--radius-full);
    width: fit-content;
}

.visitor-counter i {
    color: var(--color-accent-cyan);
    font-size: var(--font-size-base);
}

#visitor-count {
    font-weight: 600;
    color: var(--color-accent-cyan);
    min-width: 40px;
    text-align: center;
}

.visitor-label {
    color: var(--color-text-muted);
}

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

.footer-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--color-text-secondary);
    transition: all var(--transition-base);
}

.footer-social a:hover {
    background: var(--gradient-primary);
    color: var(--color-text-primary);
    transform: translateY(-3px);
}

/* ===================================
   Animations
   =================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease;
}

.fade-in-up {
    animation: fadeInUp 0.6s ease;
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(10, 14, 39, 0.98);
        backdrop-filter: blur(20px);
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        transform: translateX(100%);
        transition: transform var(--transition-base);
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .nav-menu.active {
        transform: translateX(0);
    }

    .nav-actions {
        gap: var(--spacing-sm);
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(7px, 7px);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }

    .hero {
        min-height: 90vh;
        padding: var(--spacing-2xl) var(--spacing-md) calc(var(--spacing-2xl) + 60px);
        margin-top: 60px;
        /* Additional margin-top for mobile */
    }

    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }

    .btn {
        justify-content: center;
    }

    .section {
        padding: var(--spacing-2xl) var(--spacing-md);
    }

    .section-header {
        margin-bottom: var(--spacing-2xl);
    }

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

    .timeline {
        padding-left: var(--spacing-lg);
    }

    .timeline-dot {
        left: calc(-1 * var(--spacing-lg) - 6px);
    }

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

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

@media (max-width: 480px) {
    .about-stats {
        grid-template-columns: 1fr;
    }

    .contact-info {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-left {
        align-items: center;
    }
}

@media (max-width: 344px) {
    .section {
        padding: var(--spacing-md) var(--spacing-sm) var(--spacing-lg);
        margin: 0 auto;
    }

    .about-stats, .cert-grid, .timeline {
        grid-template-columns: 1fr;
    }

    .about-text, .timeline-content, .project-card {
        font-size: var(--font-size-sm);
    }

    .section-header, .hero-content {
        margin: 0;
    }
}

/* ===================================
   Theme Toggle Button
   =================================== */
.theme-toggle {
    position: relative;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: var(--font-size-lg);
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-accent-cyan);
    transform: scale(1.05);
}

.theme-toggle .sun-icon,
.theme-toggle .moon-icon {
    position: absolute;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.theme-toggle .sun-icon {
    opacity: 0;
    transform: rotate(180deg) scale(0);
    color: #fbbf24;
}

.theme-toggle .moon-icon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
    color: var(--color-accent-cyan);
}

[data-theme="light"] .theme-toggle {
    background: rgba(0, 0, 0, 0.05);
    border-color: rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .theme-toggle:hover {
    background: rgba(0, 0, 0, 0.1);
    border-color: var(--color-accent-cyan);
}

[data-theme="light"] .theme-toggle .sun-icon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

[data-theme="light"] .theme-toggle .moon-icon {
    opacity: 0;
    transform: rotate(-180deg) scale(0);
}

/* Light mode navbar adjustments */
[data-theme="light"] #navbar {
    background: rgba(248, 249, 250, 0.8);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

[data-theme="light"] #navbar.scrolled {
    background: rgba(248, 249, 250, 0.95);
}

/* Light mode card adjustments */
[data-theme="light"] .stat-card,
[data-theme="light"] .cert-item,
[data-theme="light"] .publication-card,
[data-theme="light"] .timeline-content,
[data-theme="light"] .project-card,
[data-theme="light"] .article-card,
[data-theme="light"] .repo-card,
[data-theme="light"] .contact-card {
    background: rgba(0, 0, 0, 0.03);
    border: 1px solid rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .stat-card:hover,
[data-theme="light"] .cert-item:hover,
[data-theme="light"] .publication-card:hover,
[data-theme="light"] .timeline-content:hover,
[data-theme="light"] .project-card:hover,
[data-theme="light"] .article-card:hover,
[data-theme="light"] .repo-card:hover,
[data-theme="light"] .contact-card:hover {
    background: rgba(0, 0, 0, 0.05);
}

/* ===================================
   3D Section Transitions
   =================================== */
.section {
    perspective: 1000px;
    transform-style: preserve-3d;
}

.section-3d-enter {
    opacity: 0;
    transform: rotateX(-15deg) translateY(50px) scale(0.95);
}

.section-3d-active {
    opacity: 1;
    transform: rotateX(0deg) translateY(0) scale(1);
    transition: all 0.8s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* 3D Card Effects */
.project-card,
.article-card,
.repo-card {
    transform-style: preserve-3d;
    transition: transform 0.6s cubic-bezier(0.23, 1, 0.32, 1);
}

.project-card:hover,
.article-card:hover,
.repo-card:hover {
    transform: translateY(-10px) rotateX(5deg) rotateY(5deg);
}

/* Parallax Layers */
.parallax-layer {
    transition: transform 0.3s ease-out;
}

/* Smooth theme transition */
:root {
    transition: --color-bg-primary 0.6s cubic-bezier(0.4, 0, 0.2, 1),
        --color-bg-secondary 0.6s cubic-bezier(0.4, 0, 0.2, 1),
        --color-bg-tertiary 0.6s cubic-bezier(0.4, 0, 0.2, 1),
        --color-text-primary 0.6s cubic-bezier(0.4, 0, 0.2, 1),
        --color-text-secondary 0.6s cubic-bezier(0.4, 0, 0.2, 1),
        --color-text-muted 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

body,
#navbar,
.section,
.section-dark,
.stat-card,
.cert-item,
.publication-card,
.timeline-content,
.project-card,
.article-card,
.repo-card,
.contact-card,
.social-link,
.btn-secondary,
.nav-link,
.footer,
.footer-social a,
.theme-toggle {
    transition: background-color 0.6s cubic-bezier(0.4, 0, 0.2, 1),
        color 0.6s cubic-bezier(0.4, 0, 0.2, 1),
        border-color 0.6s cubic-bezier(0.4, 0, 0.2, 1),
        box-shadow 0.6s cubic-bezier(0.4, 0, 0.2, 1),
        transform 0.3s ease;
}

@media (max-width: 768px) {
    .section {
        padding: var(--spacing-2xl) var(--spacing-md) var(--spacing-xl);
    }

    .about-stats {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 749px) {
    .section {
        padding: var(--spacing-xl) var(--spacing-md);
        margin: 0 auto;
    }

    .about-stats, .cert-grid, .timeline {
        grid-template-columns: 1fr;
    }

    .about-text, .timeline-content, .project-card {
        font-size: var(--font-size-base);
    }

    .section-header, .hero-content {
        margin: 0;
    }
}