:root {
    --bg-main: #060606;
    --bg-alt: #0a0a0a;
    --text-primary: #ededed;
    --text-secondary: #888888;
    --accent: #2563eb;
    --accent-hover: #3b82f6;
    --border-color: rgba(255, 255, 255, 0.1);
    --font-sans: 'Inter', sans-serif;
    --font-heading: 'Space Grotesk', sans-serif;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

#particleCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
    opacity: 0.4;
}

.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: var(--accent);
    z-index: 2001;
    transition: width 0.1s ease;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-main);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Preloader */
#preloader {
    position: fixed;
    inset: 0;
    background-color: var(--bg-main);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.8s ease, visibility 0.8s;
}

#preloader.loaded {
    opacity: 0;
    visibility: hidden;
}

.loader-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.loader-logo {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.05em;
    animation: loaderPulse 1.5s infinite ease-in-out;
}

.loader-bar {
    width: 150px;
    height: 2px;
    background-color: rgba(255, 255, 255, 0.05);
    position: relative;
    overflow: hidden;
}

.loader-bar::after {
    content: '';
    position: absolute;
    top: 0; left: 0; bottom: 0;
    width: 50%;
    background-color: var(--accent);
    animation: loaderBar 1.5s infinite ease-in-out;
}

@keyframes loaderPulse {
    0%, 100% { opacity: 0.5; transform: scale(0.95); }
    50% { opacity: 1; transform: scale(1); }
}

@keyframes loaderBar {
    0% { left: -50%; }
    100% { left: 100%; }
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
    cursor: none; /* For custom cursor */
}

/* Custom Cursor */
.cursor-dot, .cursor-outline {
    position: fixed;
    top: 0; left: 0;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    z-index: 9999;
    pointer-events: none;
}

.cursor-dot {
    width: 6px;
    height: 6px;
    background-color: #fff;
    mix-blend-mode: difference;
}

.cursor-outline {
    width: 32px;
    height: 32px;
    border: 1px solid rgba(255, 255, 255, 0.4);
    transition: width 0.2s, height 0.2s, background-color 0.2s;
}

/* Typography Utilities */
h1, h2, h3, h4 {
    font-family: var(--font-heading);
    font-weight: 500;
    line-height: 1.2;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 5%;
}

.section-padding {
    padding: 120px 0;
}

.bg-alt {
    background-color: var(--bg-alt);
}

.mt-4 { margin-top: 2rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 2rem; }
.block { display: block; }
.mx-auto { margin-left: auto; margin-right: auto; }
.max-w-lg { max-width: 800px; }
.text-center { text-align: center; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.75rem;
    font-family: var(--font-heading);
    font-weight: 500;
    font-size: 0.9rem;
    border-radius: 4px;
    cursor: none;
    border: 1px solid transparent;
}

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

.btn-primary:hover {
    background-color: #fff;
    transform: translateY(-2px);
}

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

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

.btn-large {
    padding: 1rem 2.5rem;
    font-size: 1rem;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: 80px;
    display: flex;
    align-items: center;
    background-color: rgba(6, 6, 6, 0.85);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.navbar.scrolled {
    height: 70px;
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.05em;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    font-size: 0.85rem;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: none;
}

.bar {
    width: 25px;
    height: 2px;
    background-color: var(--text-primary);
    transition: 0.3s;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 80px;
}

.hero-grid {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 4rem;
    align-items: center;
}

.hero-subtitle {
    color: var(--accent);
    font-family: var(--font-sans);
    font-weight: 500;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.hero-title {
    font-size: clamp(3rem, 5vw, 4.5rem);
    font-weight: 600;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

.highlight {
    color: var(--text-secondary);
}

.d-block { display: block; }

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin-bottom: 2.5rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
}

.image-container {
    position: relative;
    width: 100%;
    max-width: 400px;
    aspect-ratio: 4/5;
    margin: 0 auto;
}

.profile-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: grayscale(100%) contrast(1.1);
    transition: var(--transition);
}

.image-container:hover .profile-img {
    filter: grayscale(0%) contrast(1);
}

.img-overlay {
    position: absolute;
    inset: 0;
    background-color: var(--accent);
    mix-blend-mode: multiply;
    opacity: 0.2;
    transition: var(--transition);
}

.image-container:hover .img-overlay {
    opacity: 0;
}

/* Scroll Down Indicator */
.scroll-down {
    position: absolute;
    bottom: 2rem;
    left: 5%;
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.8rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    transform: rotate(-90deg);
    transform-origin: left bottom;
    color: var(--text-secondary);
}

.scroll-down .line {
    width: 50px;
    height: 1px;
    background-color: var(--text-secondary);
    position: relative;
    overflow: hidden;
}

.scroll-down .line::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: var(--text-primary);
    transform: translateX(-100%);
    animation: scrollLine 2s ease-in-out infinite;
}

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

/* Section Grid Layout */
.section-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
}

.section-num {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    color: var(--accent);
    margin-bottom: 0.5rem;
    display: block;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 600;
}

/* About Utilities */
.lead-text {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.secondary-text {
    color: var(--text-secondary);
    font-size: 1rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Experience Timeline */
.timeline {
    border-left: 1px solid var(--border-color);
}

.timeline-item {
    position: relative;
    padding-left: 2rem;
    padding-bottom: 3rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -5px;
    top: 5px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background-color: var(--bg-alt);
    border: 1px solid var(--accent);
}

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

.timeline-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-family: var(--font-heading);
}

.timeline-date { color: var(--accent); }

.timeline-role {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.timeline-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Projects */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

.link-arrow {
    font-family: var(--font-heading);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding-bottom: 5px;
    border-bottom: 1px solid var(--text-primary);
}

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

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

.project-filter {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.filter-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.5rem 1.25rem;
    border-radius: 4px;
    font-family: var(--font-heading);
    font-size: 0.85rem;
    cursor: none;
    transition: var(--transition);
}

.filter-btn:hover, .filter-btn.active {
    border-color: var(--text-primary);
    color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.05);
}

.project-card {
    background-color: var(--bg-alt);
    border: 1px solid var(--border-color);
    padding: 2rem;
    border-radius: 4px;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

.project-card:hover {
    transform: translateY(-5px);
    border-color: rgba(255, 255, 255, 0.3);
}

.project-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.folder-icon {
    font-size: 2rem;
    color: var(--accent);
}

.project-links a {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-left: 0.5rem;
}

.project-links a:hover {
    color: var(--text-primary);
}

.project-title {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.project-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    flex-grow: 1;
    margin-bottom: 2rem;
}

.project-tech-list {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    list-style: none;
    font-family: var(--font-sans);
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Skills */
.skills-layout {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.skill-header {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.skill-tags span {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

.skill-tags span:hover {
    border-color: var(--text-primary);
    color: var(--text-primary);
}

/* Education */
.edu-item {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.edu-date {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.edu-body h3 {
    font-size: 1.2rem;
    margin-bottom: 0.25rem;
}

.edu-location {
    color: var(--accent);
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
}

/* Skills Progress */
.skill-progress-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.skill-item {
    width: 100%;
}

.skill-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.progress-bar {
    width: 100%;
    height: 6px;
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    overflow: hidden;
}

.progress {
    height: 100%;
    background: var(--accent);
    border-radius: 10px;
    width: 0; /* Initial width for animation */
    transition: width 1.5s cubic-bezier(0.17, 0.67, 0.83, 0.67);
}

.skill-tags {
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 4px;
    font-size: 0.8rem;
    font-family: var(--font-heading);
}

.border-title {
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

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

.cert-list li {
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.cert-list i {
    color: var(--accent);
    margin-right: 0.5rem;
    font-size: 0.8rem;
}

/* Contact */
.contact-title {
    font-size: clamp(2.5rem, 4vw, 3.5rem);
    margin-bottom: 1rem;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}

.social-links a {
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    color: var(--text-secondary);
    font-size: 1.2rem;
}

.social-links a:hover {
    color: var(--bg-main);
    background-color: var(--text-primary);
    border-color: var(--text-primary);
}

/* Footer */
.footer {
    padding: 2rem 0;
    border-top: 1px solid var(--border-color);
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-family: var(--font-heading);
}

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 110px; /* To shift left of chatbot */
    width: 50px;
    height: 50px;
    background-color: var(--bg-alt);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: none;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: var(--accent);
    border-color: var(--accent);
    color: white;
    transform: translateY(-5px);
}

/* Animations (Reveal on Scroll) */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in {
    opacity: 0;
    transition: opacity 0.8s ease;
}

.fade-up.visible, .fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-delay-1 { transition-delay: 0.1s; }
.fade-delay-2 { transition-delay: 0.2s; }

/* Responsive */
@media (max-width: 900px) {
    .section-grid, .hero-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .scroll-down { display: none; }
    
    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background-color: rgba(6, 6, 6, 0.98);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        transition: 0.4s;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle { display: flex; }
    
    .edu-item {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }
}