:root {
    /* Colors - Dark Theme */
    --bg-dark: #0a0f1e;
    --bg-card: #111827;
    --bg-card-hover: #1f2937;

    --text-primary: #f8f9fa;
    --text-secondary: #a0a0b0;

    --accent-electric-blue: #00f0ff;
    --accent-electric-green: #10b981;
    --accent-purple: #6366f1; /* Changed to Electric Indigo */
    --accent-blue: #3b82f6;
    --accent-amber: #f59e0b;

    --gradient-primary: linear-gradient(135deg, #6366f1, #3b82f6);
    --gradient-secondary: linear-gradient(135deg, var(--accent-electric-blue), var(--accent-electric-green));

    /* Typography */
    --font-main: 'Inter', sans-serif;
    --font-heading: 'Space Grotesk', sans-serif;

    /* Spacing */
    --section-padding: 100px 0;
    --container-width: 1200px;

    /* Border Radius */
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 24px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
}

section {
    padding: var(--section-padding);
}

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

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

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

ul {
    list-style: none;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-normal);
}

.navbar.scrolled {
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}

.nav-content {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 1.2rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: -1px;
}

.logo span {
    color: var(--accent-electric-blue);
}

.nav-links {
    display: flex;
    gap: 2.5rem;
    align-items: center;
}

.nav-links a {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.nav-links a:hover {
    color: var(--accent-electric-blue);
}

.hamburger {
    display: none;
    cursor: pointer;
    font-size: 1.5rem;
}

/* Buttons */
.btn-primary,
.btn-primary-sm,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    border: none;
}

.btn-primary {
    padding: 0.8rem 1.8rem;
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 15px rgba(176, 85, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(176, 85, 255, 0.4);
}

.btn-primary-sm {
    padding: 0.5rem 1.2rem;
    background: var(--gradient-primary);
    color: white;
    border-radius: var(--border-radius-sm);
}

.btn-secondary {
    padding: 0.8rem 1.8rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

/* Hero Section */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 5rem;
    /* Account for navbar */
    position: relative;
    overflow: hidden;
}

/* Background grid effect */
.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    z-index: -1;
    opacity: 0.5;
    mask-image: radial-gradient(circle at center, black, transparent 80%);
    -webkit-mask-image: radial-gradient(circle at center, black, transparent 80%);
}

.hero-container {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 4rem;
    align-items: center;
}

.greeting {
    color: var(--accent-electric-blue);
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.name {
    font-size: 4.5rem;
    margin-bottom: 0.5rem;
    letter-spacing: -1px;
}

.title {
    font-size: 2rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.tagline-container {
    height: 4.5rem;
    /* Fixed height */
    margin-bottom: 2.5rem;
}

.tagline {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    line-height: 1.8;
}

.cta-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

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

.image-wrapper {
    position: relative;
    width: 350px;
    height: 350px;
    border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
    overflow: hidden;
    animation: morph 8s ease-in-out infinite;
    border: 2px solid rgba(255, 255, 255, 0.1);
    box-shadow: inset 0 0 20px rgba(0, 240, 255, 0.2), 0 0 40px rgba(176, 85, 255, 0.2);
}

.image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center top;
}

/* Toast */
.toast {
    position: fixed;
    bottom: -100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-card);
    color: white;
    padding: 12px 24px;
    border-radius: 30px;
    border: 1px solid var(--accent-electric-blue);
    box-shadow: 0 4px 15px rgba(0, 240, 255, 0.2);
    transition: bottom 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 10000;
    font-weight: 500;
}

.toast.show {
    bottom: 30px;
}

/* Section Titles */
.section-title {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
}

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.stat-card {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: var(--border-radius-md);
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-normal);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    border-color: rgba(0, 240, 255, 0.2);
}

.stat-card h3 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.stat-card p {
    color: var(--text-secondary);
    font-weight: 500;
}

/* Tech Stack Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.skill-category {
    background: var(--bg-card);
    padding: 2.5rem;
    border-radius: var(--border-radius-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-normal);
}

.skill-category:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    border-color: rgba(176, 85, 255, 0.2);
}

.skill-category h3 {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    font-size: 1.3rem;
}

.skill-category h3 i {
    color: var(--accent-electric-blue);
    font-size: 1.5rem;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
}

.skill-tag {
    background: rgba(255, 255, 255, 0.05);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-fast);
}

.skill-category:hover .skill-tag {
    border-color: rgba(255, 255, 255, 0.1);
}

.skill-tag:hover {
    background: rgba(176, 85, 255, 0.1);
    color: var(--text-primary);
    border-color: var(--accent-purple);
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2.5rem;
}

.project-card {
    background: var(--bg-card);
    border-radius: var(--border-radius-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    flex-direction: column;
    height: 100%;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(99, 102, 241, 0.3);
    border-color: #6366f1;
}

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

.project-content {
    padding: 2.5rem 2rem;
    flex-grow: 1;
}

.project-title {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.project-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.project-tech span {
    font-size: 0.8rem;
    color: var(--accent-electric-blue);
    background: rgba(0, 240, 255, 0.1);
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
    font-weight: 500;
}

.project-highlights {
    list-style: none;
    padding-left: 0;
}

.project-highlights li {
    position: relative;
    padding-left: 1.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.project-highlights li::before {
    content: '\f105';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    position: absolute;
    left: 0;
    color: var(--accent-purple);
}

.project-links {
    padding: 1.5rem 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    gap: 1rem;
    background: rgba(0, 0, 0, 0.2);
}

/* Filter Section */
.filter-container {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.filter-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
    padding: 0.6rem 1.5rem;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-size: 0.95rem;
    font-family: var(--font-main);
    transition: var(--transition-fast);
}

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

/* List view for other projects */
.projects-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    background: var(--bg-card);
    border-radius: var(--border-radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-fast);
}

.list-item:hover {
    background: var(--bg-card-hover);
    border-color: rgba(176, 85, 255, 0.2);
    transform: translateX(5px);
}

.list-item-title {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1.1rem;
}

.list-item-category {
    font-size: 0.85rem;
    color: var(--accent-electric-blue);
    background: rgba(0, 240, 255, 0.1);
    padding: 0.2rem 0.8rem;
    border-radius: 12px;
}

/* Timeline Section (Experience & Education) */
.timeline-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.timeline {
    position: relative;
    padding-left: 2rem;
    border-left: 2px solid rgba(255, 255, 255, 0.1);
}

.timeline-item {
    position: relative;
    margin-bottom: 2.5rem;
}

.timeline-dot {
    position: absolute;
    left: -2.05rem;
    top: 5px;
    width: 1rem;
    height: 1rem;
    background: var(--accent-electric-blue);
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(0, 240, 255, 0.5);
}

.timeline-content h3 {
    font-size: 1.3rem;
    color: var(--text-primary);
    margin-bottom: 0.3rem;
}

.timeline-org {
    color: var(--accent-purple);
    font-weight: 600;
    margin-bottom: 0.3rem;
}

.timeline-date {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.timeline-content ul {
    list-style: none;
}

.timeline-content li {
    position: relative;
    padding-left: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.timeline-content li::before {
    content: '-';
    position: absolute;
    left: 0;
    color: var(--accent-electric-blue);
}

.timeline-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
}

/* Dual Grid for Achievements & Certs */
.dual-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 4rem;
}

.achievement-list {
    list-style: none;
}

.achievement-list li {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    line-height: 1.6;
}

.achievement-list li:last-child {
    border-bottom: none;
}

.achievement-list i {
    color: var(--accent-purple);
    font-size: 1.2rem;
    margin-top: 0.2rem;
}

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

.cert-card {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: var(--border-radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-fast);
}

.cert-card:hover {
    background: var(--bg-card-hover);
    transform: translateX(5px);
    border-color: rgba(0, 240, 255, 0.2);
}

.cert-card i {
    font-size: 2rem;
    color: var(--accent-electric-blue);
}

.cert-card h4 {
    margin-bottom: 0.2rem;
    font-size: 1.1rem;
}

.cert-card p {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* GitHub Stats Section */
.github-content {
    background: var(--bg-card);
    padding: 3rem;
    border-radius: var(--border-radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    text-align: center;
}

.gh-stats-grid {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.gh-stat-card {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.gh-stat-card i {
    font-size: 2.5rem;
    color: var(--text-primary);
}

.gh-stat-card h4 {
    font-size: 2rem;
    margin-bottom: 0;
    color: var(--accent-electric-blue);
}

.gh-stat-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.gh-graph-container {
    background: rgba(255, 255, 255, 0.02);
    padding: 1.5rem;
    border-radius: var(--border-radius-md);
    overflow-x: auto;
}

.gh-chart {
    max-width: 100%;
}

/* Contact Section */
.contact-container {
    text-align: center;
    max-width: 800px;
}

.contact-desc {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 3rem;
    line-height: 1.8;
}

.contact-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 1.5rem;
}

.contact-card {
    background: var(--bg-card);
    padding: 2.5rem 1.5rem;
    border-radius: var(--border-radius-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-normal);
    cursor: pointer;
    text-decoration: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.contact-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    border-color: rgba(176, 85, 255, 0.3);
}

.contact-card i {
    font-size: 2.5rem;
    color: var(--accent-electric-blue);
}

.contact-card h3 {
    margin-bottom: 0;
    font-size: 1.2rem;
    color: var(--text-primary);
}

.contact-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    word-break: break-all;
}

.copy-hint {
    font-size: 0.8rem;
    color: var(--accent-purple);
    opacity: 0;
    transition: var(--transition-fast);
}

.contact-card:hover .copy-hint {
    opacity: 1;
}

/* Footer */
footer {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: 2rem 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 992px) {
    .about-content {
        grid-template-columns: 1fr;
    }

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 3rem;
    }

    .name {
        font-size: 3.5rem;
    }

    .title {
        font-size: 1.5rem;
    }

    .tagline-container {
        height: auto;
        min-height: 4.5rem;
        margin: 0 auto 2.5rem;
    }

    .cta-group {
        justify-content: center;
    }

    .image-wrapper {
        width: 300px;
        height: 300px;
    }
}

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

    .hamburger {
        display: block;
    }

    .name {
        font-size: 2.5rem;
    }
}
/* Scroll to Top Button */
.scroll-top-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--gradient-primary);
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
    transition: var(--transition-normal);
    opacity: 0;
    visibility: hidden;
    z-index: 1000;
}

.scroll-top-btn.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top-btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.6);
}

/* Research Section */
.research-section {
    padding: var(--section-padding);
}

.research-card {
    background: linear-gradient(145deg, rgba(245, 158, 11, 0.05) 0%, rgba(17, 24, 39, 1) 100%);
    border: 1px solid rgba(245, 158, 11, 0.3);
    border-radius: var(--border-radius-lg);
    padding: 3rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.research-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--accent-amber);
}

.research-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(245, 158, 11, 0.2);
    border-color: rgba(245, 158, 11, 0.6);
}

.research-title {
    font-size: 2rem;
    color: var(--accent-amber);
    margin-bottom: 1rem;
}

.research-published {
    color: var(--text-secondary);
    font-family: var(--font-heading);
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
}

.research-desc {
    color: var(--text-primary);
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 2rem;
}

/* Demo link placeholders */
.demo-link-placeholder {
    border-style: dashed !important;
    opacity: 0.7;
}

.demo-link-placeholder:hover {
    opacity: 1;
    border-style: solid !important;
}

/* Animated gradient border for hero image wrapper */
.animated-gradient-border {
    padding: 4px;
    background: linear-gradient(45deg, var(--accent-purple), var(--accent-electric-blue), var(--accent-amber));
    background-size: 400% 400%;
    animation: gradientBorder 5s ease infinite;
}

@keyframes gradientBorder {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}