/* ========================================
   Professional Neo-Tech Minimalism Theme
   Dark Mode: Black → Blue → Gold
   Light Mode: White → Red → Gold
   ======================================== */

/* ================== CSS Variables ================== */
:root {
    /* Dark Mode Colors (Default) */
    --color-primary: #000000;
    --color-secondary: #000000;
    --color-accent-blue: #3B82F6;
    --color-accent-gold: #EFBF66;
    --color-text-light: #F8FAFC;
    --color-text-muted: #94A3B8;
    --color-shadow: rgba(0, 0, 0, 0.4);
    --color-border: rgba(59, 130, 246, 0.2);
    
    /* Gradient Dark */
    --gradient-primary: linear-gradient(135deg, #000000 0%, #3B82F6 50%, #EFBF66 100%);
    --gradient-accent: linear-gradient(90deg, #3B82F6, #EFBF66);
    
    /* UI Elements */
    --navbar-bg: rgba(0, 0, 0, 0.95);
    --card-bg: rgba(0, 0, 0, 0.2);
    --card-border: rgba(59, 130, 246, 0.2);
    --glass-bg: rgba(148, 163, 184, 0.15);
    
    /* Typography */
    --font-heading: 'Crimson Pro', serif;
    --font-body: 'Inter', sans-serif;
    --font-ui: 'DM Sans', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
}

/* Light Mode Colors */
[data-theme="light"] {
    --color-primary: #FFFFFF;
    --color-secondary: #F1F5F9;
    --color-accent-red: #D64545;
    --color-accent-gold: #C48F2E;
    --color-text-dark: #1E293B;
    --color-text-muted: #64748B;
    --color-shadow: rgba(0, 0, 0, 0.06);
    --color-border: rgba(0, 0, 0, 0.1);
    
    /* Gradient Light */
    --gradient-primary: linear-gradient(135deg, #FFFFFF 0%, #D64545 50%, #C48F2E 100%);
    --gradient-accent: linear-gradient(90deg, #D64545, #C48F2E);
    
    /* UI Elements */
    --navbar-bg: rgba(255, 255, 255, 0.95);
    --card-bg: rgba(255, 255, 255, 0.2);
    --card-border: rgba(0, 0, 0, 0.15);
    --glass-bg: rgba(255, 255, 255, 0.7);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-body);
    line-height: 1.7;
    color: var(--color-text-light);
    background-color: var(--color-primary);
    transition: background-color var(--transition-base), color var(--transition-base);
    overflow-x: hidden;
}

[data-theme="light"] body {
    color: var(--color-text-dark);
}

/* ================== Typography ================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
}

h2 {
    font-size: clamp(2rem, 4vw, 3.5rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2.5rem);
}

p {
    margin-bottom: 1rem;
    font-size: clamp(1rem, 1.5vw, 1.125rem);
}

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

/* ================== Container & Layout ================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    width: 100%;
}

@media (max-width: 768px) {
    .container {
        padding: 0 1.25rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
}

.section-padding {
    padding: 3rem 0;
}

@media (max-width: 968px) {
    .section-padding {
        padding: 3.5rem 0;
    }
}

@media (max-width: 640px) {
    .section-padding {
        padding: 2.5rem 0;
    }
}

/* ================== Particle Canvas Background ================== */
.particle-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
    opacity: 0.4;
}

/* ================== Navigation ================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--navbar-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 2px solid var(--card-border);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    z-index: 1000;
    transition: all var(--transition-base);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 700;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    gap: 2.5rem;
    list-style: none;
    align-items: center;
}

.nav-link {
    font-family: var(--font-ui);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
    transition: all var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-accent);
    transition: width var(--transition-base);
}

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

.nav-link-cv {
    padding: 0.5rem 1.25rem;
    background: var(--gradient-accent);
    color: white;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-link-cv::after {
    display: none;
}

.nav-link-cv:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px var(--color-shadow);
}

/* Theme Toggle */
.theme-toggle {
    background: transparent;
    border: 2px solid var(--card-border);
    border-radius: var(--radius-sm);
    padding: 0.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    position: relative;
    width: 45px;
    height: 45px;
}

.theme-toggle:hover {
    border-color: var(--color-accent-red);
    transform: scale(1.05);
}

[data-theme="dark"] .theme-toggle:hover {
    border-color: var(--color-accent-blue);
}

.sun-icon,
.moon-icon {
    position: absolute;
    transition: all var(--transition-base);
}

.sun-icon {
    opacity: 0;
    transform: rotate(90deg);
}

.moon-icon {
    opacity: 1;
    transform: rotate(0deg);
    color: #FFFFFF;
}

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

[data-theme="light"] .moon-icon {
    opacity: 0;
    transform: rotate(90deg);
}

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.hamburger span {
    width: 25px;
    height: 2px;
    background: currentColor;
    transition: all var(--transition-base);
}

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

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

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

@media (max-width: 968px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: var(--navbar-bg);
        backdrop-filter: blur(20px);
        width: 100%;
        text-align: center;
        transition: left var(--transition-base);
        padding: 2rem 0;
        border-bottom: 1px solid var(--card-border);
        gap: 1.5rem;
        z-index: 999;
    }
    
    .nav-menu.active {
        left: 0;
        display: flex;
    }
}

/* ================== Hero Section ================== */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding-top: 80px;
    padding-bottom: 2rem;
    overflow: hidden;
}

@media (max-width: 640px) {
    .hero-section {
        min-height: auto;
        padding-top: 100px;
        padding-bottom: 2rem;
    }
}

.hero-gradient-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    opacity: 0.05;
    pointer-events: none;
}

[data-theme="dark"] .hero-gradient-overlay {
    opacity: 0.08;
}

.hero-container {
    position: relative;
    z-index: 1;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

@media (max-width: 968px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 3rem;
    }
}

.hero-text {
    animation: fadeInUp 1s ease-out;
}

.hero-greeting {
    display: block;
    font-size: clamp(1.25rem, 2vw, 1.5rem);
    font-weight: 400;
    margin-bottom: 0.5rem;
    color: var(--color-text-muted);
}

.hero-name {
    display: block;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.5rem);
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--color-text-muted);
}

.hero-tagline {
    font-family: var(--font-heading);
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    font-style: italic;
    margin-bottom: 2.5rem;
    line-height: 1.5;
    opacity: 0.9;
}

.hero-cta {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
}

@media (max-width: 968px) {
    .hero-cta {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-cta {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
    }
    
    .hero-cta .btn {
        width: 100%;
        justify-content: center;
    }
}

/* Buttons */
.btn {
    font-family: var(--font-ui);
    font-weight: 600;
    font-size: clamp(0.9rem, 2vw, 1rem);
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    border: none;
    text-align: center;
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-accent);
    color: white;
    box-shadow: 0 4px 15px var(--color-shadow);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px var(--color-shadow);
}

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

.btn-secondary:hover {
    border-color: var(--color-accent-red);
    background: var(--color-secondary);
    transform: translateY(-3px);
}

[data-theme="dark"] .btn-secondary:hover {
    border-color: var(--color-accent-blue);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--card-border);
    color: inherit;
    padding: 0.75rem 1.75rem;
}

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

[data-theme="dark"] .btn-outline:hover {
    border-color: var(--color-accent-blue);
}

/* Social Links */
.social-links {
    display: flex;
    gap: 1.25rem;
    flex-wrap: wrap;
}

@media (max-width: 968px) {
    .social-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .social-links {
        gap: 1rem;
    }
    
    .social-icon {
        width: 42px;
        height: 42px;
    }
}

.social-icon {
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--card-border);
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
}

.social-icon:hover {
    border-color: var(--color-accent-red);
    background: var(--color-secondary);
    transform: translateY(-3px);
}

[data-theme="dark"] .social-icon:hover {
    border-color: var(--color-accent-blue);
}

/* Hero Image */
.hero-image {
    position: relative;
    animation: fadeInRight 1s ease-out;
}

@media (max-width: 968px) {
    .hero-image {
        order: -1;
    }
}

.image-container {
    position: relative;
    width: 100%;
    max-width: 450px;
    margin: 0 auto;
}

@media (max-width: 640px) {
    .image-container {
        max-width: 300px;
    }
}

.image-glow {
    position: absolute;
    top: -10%;
    left: -10%;
    width: 120%;
    height: 120%;
    background: var(--gradient-accent);
    border-radius: var(--radius-sm);
    filter: blur(40px);
    opacity: 0.3;
    z-index: -1;
    animation: pulse 4s ease-in-out infinite;
}

.image-container img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
    border: 3px solid var(--card-border);
    object-fit: cover;
    aspect-ratio: 1/1;
    transition: all var(--transition-base);
}

.image-container:hover img {
    transform: scale(1.02);
    border-color: var(--color-accent-red);
}

[data-theme="dark"] .image-container:hover img {
    border-color: var(--color-accent-blue);
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-muted);
    animation: bounce 2s infinite;
}

/* ================== Neural Line Connectors ================== */
.neural-connector {
    width: 100%;
    height: 2px;
    background: var(--gradient-accent);
    opacity: 0.3;
    position: relative;
    margin: 1rem 0;
}

.neural-connector::before,
.neural-connector::after {
    content: '';
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--gradient-accent);
    border-radius: 50%;
    top: 50%;
    transform: translateY(-50%);
    animation: pulse 2s ease-in-out infinite;
}

.neural-connector::before {
    left: 10%;
}

.neural-connector::after {
    right: 10%;
}

/* ================== Section Titles ================== */
.section-title {
    text-align: center;
    margin-bottom: 2.5rem;
    position: relative;
}

.about-section .section-title {
    margin-bottom: 2rem;
}

@media (max-width: 640px) {
    .section-title {
        margin-bottom: 2.5rem;
    }
    
    .about-section .section-title {
        margin-bottom: 1.5rem;
    }
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: var(--gradient-accent);
    border-radius: 2px;
}

.subsection-title {
    font-size: clamp(1.5rem, 2.5vw, 2rem);
    margin-bottom: 1.5rem;
}

/* Center align Fun Facts title */
.fun-facts-section .subsection-title {
    text-align: center;
    font-size: clamp(1.65rem, 2.75vw, 2.25rem);
}

/* ================== About Section ================== */
.about-section {
    background: transparent;
    padding: 3rem 0 3rem 0;
}

@media (max-width: 968px) {
    .about-section {
        padding: 3.5rem 0 2.5rem 0;
    }
}

@media (max-width: 640px) {
    .about-section {
        padding: 2.5rem 0 2rem 0;
    }
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
    max-width: 1800px;
    margin: 0 auto;
    width: 100%;
}

@media (max-width: 1024px) {
    .about-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}

@media (max-width: 640px) {
    .about-content {
        gap: 1.5rem;
    }
}

.about-text {
    width: 100%;
    max-width: 100%;
}

.education-section {
    margin-bottom: 0;
    padding: 1.5rem;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 2px solid var(--card-border);
    border-radius: var(--radius-sm);
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
}

@media (max-width: 640px) {
    .education-section {
        padding: 1.25rem;
    }
}

.about-intro-section {
    grid-column: 1 / -1;
    margin-bottom: 1.5rem;
    text-align: center;
}

@media (max-width: 640px) {
    .about-intro-section {
        margin-bottom: 1rem;
    }
}

.about-intro {
    font-size: clamp(1.125rem, 1.75vw, 1.375rem);
    font-weight: 500;
    line-height: 1.6;
    color: var(--color-text-muted);
    max-width: 900px;
    margin: 0 auto;
    padding: 1.25rem 1.5rem;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 2px solid var(--card-border);
    border-radius: var(--radius-sm);
}

@media (max-width: 640px) {
    .about-intro {
        padding: 1rem;
        line-height: 1.5;
    }
}

.education-item {
    margin: 0;
    line-height: 1.6;
}

.education-item p {
    margin: 0.75rem 0;
}

.education-degree {
    font-size: 1.2rem !important;
    color: var(--color-accent-blue);
    margin-top: 0 !important;
}

[data-theme="light"] .education-degree {
    color: var(--color-accent-red);
}

.education-details, .education-honors, .education-graduation {
    font-size: 1.05rem;
}

@media (max-width: 640px) {
    .education-degree {
        font-size: 1.1rem !important;
    }
    
    .education-details,
    .education-honors {
        font-size: 0.95rem;
    }
}

/* Fun Facts Section */
.fun-facts-section {
    margin-top: 2rem;
    grid-column: 1 / -1;
}

.fun-facts-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-top: 1.5rem;
    max-width: 1800px;
    margin-left: auto;
    margin-right: auto;
}

.fun-fact-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 2px solid var(--card-border);
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
    width: 100%;
}

.fun-fact-item:hover {
    transform: translateY(-5px);
    border-color: var(--color-accent-blue);
    box-shadow: 0 10px 25px var(--color-shadow);
}

[data-theme="light"] .fun-fact-item:hover {
    border-color: var(--color-accent-red);
}

.fun-fact-icon {
    font-size: 2rem;
    flex-shrink: 0;
    margin-top: 0.25rem;
}

.fun-fact-content h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--color-accent-blue);
}

[data-theme="light"] .fun-fact-content h4 {
    color: var(--color-accent-red);
}

.fun-fact-content p {
    font-size: 0.95rem;
    line-height: 1.5;
    margin: 0;
    color: var(--color-text-muted);
}

@media (max-width: 640px) {
    .fun-facts-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .about-intro {
        padding: 1.25rem;
    }
    
    .fun-fact-item {
        padding: 1.25rem;
    }
}

@media (max-width: 968px) and (min-width: 641px) {
    .fun-facts-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 1200px) and (min-width: 969px) {
    .fun-facts-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1201px) and (max-width: 1500px) {
    .fun-facts-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.about-description,
.about-mission {
    font-size: clamp(1rem, 1.5vw, 1.125rem);
    line-height: 1.8;
    color: var(--color-text-muted);
}

.interests-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    height: auto;
}

.interest-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.625rem 0.75rem;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 2px solid var(--card-border);
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
    list-style: none;
    flex: 0 0 auto;
}

.interest-item:not(:last-child) {
    margin-bottom: 0.75rem;
}

@media (max-width: 1024px) {
    .interest-item:not(:last-child) {
        margin-bottom: 1rem;
    }
}

.interest-icon {
    font-size: 1.75rem;
    flex-shrink: 0;
}

.interest-item:hover {
    transform: translateX(10px);
    border-color: var(--color-accent-blue);
    box-shadow: 0 8px 20px var(--color-shadow);
}

[data-theme="light"] .interest-item:hover {
    border-color: var(--color-accent-red);
}

.research-interests {
    padding: 1.5rem;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 2px solid var(--card-border);
    border-radius: var(--radius-sm);
    margin: 0;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    height: auto;
}

.research-interests .subsection-title {
    margin-bottom: 1.25rem;
    margin-top: 0;
}

@media (max-width: 640px) {
    .research-interests {
        padding: 1.25rem;
    }

    .research-interests .subsection-title {
        margin-bottom: 1rem;
        flex-shrink: 0;
    }
    
    .education-section {
        padding: 1.25rem;
    }
}

@media (max-width: 768px) {
    .interest-item {
        padding: 1rem;
        gap: 0.75rem;
        font-size: 0.95rem;
    }
    
    .interest-item:hover {
        transform: translateY(-5px);
    }
    
    .interest-icon {
        font-size: 1.5rem;
    }
}

/* ================== Skills Section ================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2.5rem;
    margin-bottom: 4rem;
}

@media (max-width: 640px) {
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid,
    .research-grid {
        grid-template-columns: 1fr !important;
    }
}

.skill-category {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 2px solid var(--card-border);
    border-radius: var(--radius-sm);
    padding: 2rem;
    transition: all var(--transition-base);
}

@media (max-width: 640px) {
    .skill-category {
        padding: 1.5rem;
    }
}

.skill-category:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 30px var(--color-shadow);
    border-color: var(--color-accent-blue);
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
}

[data-theme="light"] .skill-category:hover {
    border-color: var(--color-accent-red);
    background: var(--card-bg);
}

.category-header {
    margin-bottom: 1.5rem;
}

.category-title {
    font-size: 1.375rem;
}

.skills-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.skill-badge {
    font-family: var(--font-ui);
    font-size: 0.9rem;
    font-weight: 500;
    padding: 0.5rem 1rem;
    background: var(--color-secondary);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.skill-badge::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient-accent);
    opacity: 0.1;
    transition: left var(--transition-base);
}

.skill-badge:hover::before {
    left: 0;
}

.skill-badge:hover {
    transform: translateY(-2px);
    border-color: var(--color-accent-blue);
}

[data-theme="light"] .skill-badge:hover {
    border-color: var(--color-accent-red);
}

.skill-badge-learning {
    border: 2px dashed var(--card-border);
    background: transparent;
}

/* ================== Projects Section ================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
    margin-bottom: 3rem;
}

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

.project-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 2px solid var(--card-border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: all var(--transition-base);
    cursor: pointer;
}

@media (max-width: 640px) {
    .project-card,
    .research-card,
    .publication-card {
        border-width: 1px;
    }
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px var(--color-shadow);
    border-color: var(--color-accent-blue);
}

[data-theme="light"] .project-card:hover {
    border-color: var(--color-accent-red);
}

.project-image-wrapper {
    position: relative;
    width: 100%;
    height: 250px;
    overflow: hidden;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(139, 92, 246, 0.1));
}

.project-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
    opacity: 0.85;
}

.project-card:hover .project-image {
    transform: scale(1.1);
    opacity: 1;
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-links {
    display: flex;
    gap: 1.5rem;
}

.project-link {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
    color: black;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.project-link:hover {
    transform: scale(1.1) rotate(5deg);
}

.project-content {
    padding: 2rem;
}

@media (max-width: 640px) {
    .project-content {
        padding: 1.5rem;
    }
}

.project-title {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    margin-bottom: 1rem;
}

.project-description {
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tech-tag {
    font-family: var(--font-ui);
    font-size: 0.85rem;
    font-weight: 500;
    padding: 0.375rem 0.875rem;
    background: var(--color-secondary);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-sm);
}

/* ================== Research Section ================== */
.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

@media (max-width: 768px) {
    .research-grid {
        gap: 1.5rem;
    }
}

@media (max-width: 640px) {
    .research-grid {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }
}

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

.research-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 2px solid var(--card-border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: all var(--transition-base);
    cursor: pointer;
}

@media (max-width: 640px) {
    .research-card {
        border-width: 1px;
    }
}

.research-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px var(--color-shadow);
    border-color: var(--color-accent-blue);
}

[data-theme="light"] .research-card:hover {
    border-color: var(--color-accent-red);
}

.research-image-wrapper {
    position: relative;
    width: 100%;
    height: 250px;
    overflow: hidden;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(139, 92, 246, 0.1));
}

.research-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
    opacity: 0.85;
}

.research-card:hover .research-image {
    transform: scale(1.1);
    opacity: 1;
}

.research-date-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-family: var(--font-ui);
    font-size: 0.85rem;
    font-weight: 600;
    z-index: 2;
}

[data-theme="light"] .research-date-badge {
    background: rgba(255, 255, 255, 0.95);
    color: var(--color-text);
}

.research-content {
    padding: 2rem;
}

@media (max-width: 640px) {
    .research-content {
        padding: 1.5rem;
    }
}

.research-title {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    margin-bottom: 0.75rem;
    line-height: 1.3;
}

.research-advisor {
    font-family: var(--font-ui);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-accent-blue);
    margin-bottom: 0.75rem;
}

[data-theme="light"] .research-advisor {
    color: var(--color-accent-red);
}

.research-preview {
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: 0;
    font-size: 0.95rem;
}

.research-details {
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    max-height: 0;
    opacity: 0;
    margin-bottom: 0;
}

.research-details.expanded {
    max-height: 1000px;
    opacity: 1;
    margin-top: 1rem;
    margin-bottom: 0;
}

.research-description {
    list-style: disc;
    padding-left: 1.5rem;
    margin: 0;
    line-height: 1.8;
    font-size: clamp(0.95rem, 2vw, 1rem);
    color: var(--color-text-muted);
}

@media (max-width: 640px) {
    .research-description {
        padding-left: 1.25rem;
        font-size: 0.95rem;
        line-height: 1.7;
    }
}

.research-description li {
    margin-bottom: 0.75rem;
}

.research-description li:last-child {
    margin-bottom: 0;
}

.research-expand-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1rem;
    padding: 0.625rem 1.25rem;
    background: var(--color-secondary);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-sm);
    font-family: var(--font-ui);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.research-expand-btn:hover {
    background: var(--color-accent-blue);
    border-color: var(--color-accent-blue);
    color: white;
    transform: translateX(4px);
}

[data-theme="light"] .research-expand-btn:hover {
    background: var(--color-accent-red);
    border-color: var(--color-accent-red);
}

.research-expand-btn .expand-icon {
    transition: transform var(--transition-fast);
}

.research-expand-btn.expanded .expand-icon {
    transform: rotate(180deg);
}

.research-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.research-venue {
    font-weight: 600;
}

.research-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-ui);
    font-weight: 600;
    color: var(--color-accent-blue);
    transition: all var(--transition-fast);
}

[data-theme="light"] .research-link {
    color: var(--color-accent-red);
}

.research-link:hover {
    gap: 0.75rem;
}

/* ================== Publications Section ================== */
.publications-section {
    background: transparent;
}

.publications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
    margin-bottom: 3rem;
}

@media (max-width: 640px) {
    .publications-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}

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

.publication-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 2px solid var(--card-border);
    border-radius: var(--radius-sm);
    padding: 2rem;
    transition: all var(--transition-base);
}

@media (max-width: 640px) {
    .publication-card {
        padding: 1.5rem;
    }
}

.publication-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px var(--color-shadow);
    border-color: var(--color-accent-blue);
}

[data-theme="light"] .publication-card:hover {
    border-color: var(--color-accent-red);
}

.publication-content {
    padding: 0;
}

.publication-title {
    font-size: clamp(1.25rem, 4vw, 2rem);
    margin-bottom: 1rem;
}

.publication-description {
    color: var(--color-text-muted);
    margin-bottom: 1rem;
    line-height: 1.7;
}

.publication-abstract {
    margin-bottom: 0;
    font-size: 0.95rem;
    text-align: justify;
    text-justify: auto;
    padding-bottom: 0.5rem;
}

.research-image-wrapper {
    position: relative;
    width: 100%;
    height: 250px;
    overflow: hidden;
    background: var(--gradient-accent);
    opacity: 0.9;
}

.research-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
    mix-blend-mode: luminosity;
}

.research-card:hover .research-image {
    transform: scale(1.05);
    mix-blend-mode: normal;
}

.research-content {
    padding: 2rem;
}

@media (max-width: 640px) {
    .research-content {
        padding: 1.5rem;
    }
}

.research-title {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    margin-bottom: 1rem;
}

.research-description {
    list-style: disc;
    padding-left: 1.5rem;
    margin-top: 1rem;
    line-height: 1.8;
    font-size: clamp(0.95rem, 2vw, 1rem);
    color: var(--color-text-muted);
}

@media (max-width: 640px) {
    .research-description {
        padding-left: 1.25rem;
        font-size: 0.95rem;
        line-height: 1.7;
    }
}

.research-description li {
    margin-bottom: 0.5rem;
}

.research-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.research-venue {
    font-weight: 600;
}

.research-link {
    display: inline-flex;
    align-items: center;
    margin-top: 0.5rem;
    gap: 0.5rem;
    font-family: var(--font-ui);
    font-weight: 600;
    color: var(--color-accent-blue);
    transition: all var(--transition-fast);
}

[data-theme="light"] .research-link {
    color: var(--color-accent-red);
}

.research-link:hover {
    gap: 0.75rem;
}

.publication-content {
    padding: 0;
}

.publication-title {
    font-size: clamp(1.5rem, 4vw, 2rem); /* Increased font size */
    margin-bottom: 1rem;
}

.publication-description {
    color: var(--color-text-muted);
    margin-bottom: 1rem;
    line-height: 1.7;
}

/* ================== Blog Section ================== */
.blog-section {
    background: transparent;
    padding: 2.5rem 0 3rem 0;
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
    margin-bottom: 3rem;
}

@media (max-width: 640px) {
    .blog-grid {
        grid-template-columns: 1fr;
    }
}

.blog-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 2px solid var(--card-border);
    border-radius: var(--radius-sm);
    padding: 2rem;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

@media (max-width: 640px) {
    .blog-card {
        padding: 1.5rem;
        border-width: 1px;
    }
}

.blog-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-accent);
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

.blog-card:hover::before {
    transform: scaleX(1);
}

.blog-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 30px var(--color-shadow);
}

.blog-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    font-family: var(--font-ui);
}

.blog-date,
.blog-reading-time {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.blog-title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    line-height: 1.4;
}

.blog-excerpt {
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.blog-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.blog-tag {
    font-family: var(--font-ui);
    font-size: 0.8rem;
    font-weight: 500;
    padding: 0.25rem 0.75rem;
    background: var(--color-secondary);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-sm);
}

.blog-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-ui);
    font-weight: 600;
    color: var(--color-accent-blue);
    transition: all var(--transition-fast);
}

[data-theme="light"] .blog-link {
    color: var(--color-accent-red);
}

.blog-link:hover {
    gap: 0.75rem;
}

/* ================== Section CTA ================== */
.section-cta {
    text-align: center;
    margin-top: 3rem;
}

/* ================== Organizations Ticker ================== */
.organizations-ticker {
    background: rgba(59, 130, 246, 0.03);
    border-top: 1px solid var(--card-border);
    border-bottom: 1px solid var(--card-border);
    padding: 1.5rem 0;
    overflow: hidden;
    position: relative;
}

[data-theme="light"] .organizations-ticker {
    background: rgba(214, 69, 69, 0.03);
}

.organizations-ticker::before,
.organizations-ticker::after {
    content: '';
    position: absolute;
    top: 0;
    width: 100px;
    height: 100%;
    z-index: 2;
    pointer-events: none;
}

.organizations-ticker::before {
    left: 0;
    background: linear-gradient(to right, var(--color-primary), transparent);
}

.organizations-ticker::after {
    right: 0;
    background: linear-gradient(to left, var(--color-primary), transparent);
}

.ticker-wrapper {
    display: inline-flex;
    gap: 4rem;
    position: relative;
    animation: scroll 60s linear infinite;
    will-change: transform;
}

.ticker-content {
    display: flex;
    gap: 4rem;
    flex-shrink: 0;
}

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

/* Ensure smooth continuous scrolling */
.organizations-ticker {
    overflow: hidden;
}

.organizations-ticker:hover .ticker-wrapper {
    animation-play-state: paused;
}

.ticker-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    white-space: nowrap;
    color: var(--color-text-muted);
    font-family: var(--font-ui);
    font-weight: 500;
    font-size: clamp(0.85rem, 2vw, 1rem);
}

@media (max-width: 640px) {
    .ticker-item {
        gap: 0.5rem;
    }
    
    .ticker-logo {
        width: 24px;
        height: 24px;
    }
    
    .ticker-content {
        gap: 2rem;
        padding-right: 2rem;
    }
}

.ticker-logo {
    width: 32px;
    height: 32px;
    object-fit: contain;
    flex-shrink: 0;
    filter: grayscale(100%) brightness(0.8);
    transition: filter var(--transition-base);
}

.ticker-item:hover .ticker-logo {
    filter: grayscale(0%) brightness(1);
}

[data-theme="light"] .ticker-logo {
    filter: grayscale(100%) brightness(0.6);
}

[data-theme="light"] .ticker-item:hover .ticker-logo {
    filter: grayscale(0%) brightness(1);
}

.ticker-item svg {
    color: var(--color-accent-blue);
    flex-shrink: 0;
}

[data-theme="light"] .ticker-item svg {
    color: var(--color-accent-red);
}

/* ================== Footer ================== */
.footer {
    background: var(--color-primary);
    border-top: 3px solid var(--card-border);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3);
    padding: 2rem 0;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

@media (max-width: 768px) {
    .footer-bottom {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }
}

.footer-copyright {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.footer-social {
    display: flex;
    gap: 1rem;
}

.footer-social-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--card-border);
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
}

.footer-social-icon:hover {
    border-color: var(--color-accent-blue);
    background: var(--color-secondary);
    transform: translateY(-3px);
}

[data-theme="light"] .footer-social-icon:hover {
    border-color: var(--color-accent-red);
}

[data-theme="light"] .navbar {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .footer {
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
}

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

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

@keyframes bounce {
    0%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    50% {
        transform: translateX(-50%) translateY(-10px);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.6;
        transform: scale(1.1);
    }
}

/* ================== Utility Classes ================== */
.text-gradient {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ================== Scrollbar Styling ================== */
::-webkit-scrollbar {
    width: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--gradient-accent);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-accent-blue);
}

[data-theme="light"] ::-webkit-scrollbar-thumb:hover {
    background: #B83535;
}

/* ================== Accessibility ================== */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Focus Styles */
*:focus-visible {
    outline: 3px solid var(--color-accent-red);
    outline-offset: 3px;
}

[data-theme="dark"] *:focus-visible {
    outline-color: var(--color-accent-blue);
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}