/* CSS Variables & Reset */
:root {
    --bg-color: #081036;
    --surface-color: rgba(30, 41, 59, 0.7);
    --surface-hover: rgba(51, 65, 85, 0.8);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-primary: #38bdf8;
    --accent-secondary: #818cf8;
    --accent-tertiary: #34d399;
    --gradient-main: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    --gradient-text: linear-gradient(135deg, #60a5fa, #c084fc);
    --glass-border: 1px solid rgba(255, 255, 255, 0.1);
    --nav-height: 80px;
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

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

/* Custom Cursor */
.cursor-dot {
    width: 6px;
    height: 6px;
    background-color: var(--accent-primary);
    border-radius: 50%;
    position: fixed;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 9999;
    transform: translate(-50%, -50%);
    transition: width 0.3s, height 0.3s, background-color 0.3s;
}

.cursor-outline {
    width: 30px;
    height: 30px;
    border: 2px solid rgba(56, 189, 248, 0.5);
    border-radius: 50%;
    position: fixed;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 9998;
    transform: translate(-50%, -50%);
    transition: transform 0.1s;
}

body:hover .cursor-dot {
    opacity: 1;
}

/* Typography Utilities */
.section-title {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    text-align: center;
}

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

.accent {
    color: var(--accent-primary);
}

/* Layout Utilities */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 6rem 0;
    position: relative;
}

.bg-dim {
    background-color: rgba(15, 23, 42, 0.5);
}

/* Navbar */
.navbar {
    height: var(--nav-height);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(2, 6, 23, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: var(--glass-border);
    transition: var(--transition);
}

.nav-container {
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
}

.nav-logo {
    height: 50px;
    width: auto;
    filter: brightness(0) invert(1);
    /* Turns the blue logo white */
    transition: var(--transition);
}

.nav-logo:hover {
    opacity: 0.8;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-secondary);
    transition: var(--transition);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 0;
    background: var(--gradient-main);
    transition: width 0.3s ease;
}

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

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

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 1.8rem;
    border-radius: 50px;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    font-family: var(--font-heading);
}

.btn-primary {
    background: var(--gradient-main);
    color: #fff;
    box-shadow: 0 4px 15px rgba(56, 189, 248, 0.3);
    border: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(56, 189, 248, 0.5);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--accent-primary);
    color: var(--accent-primary);
}

.btn-outline:hover {
    background: rgba(56, 189, 248, 0.1);
    transform: translateY(-2px);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: var(--nav-height);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.gradient-sphere {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: float 10s infinite ease-in-out;
}

.sphere-1 {
    width: 500px;
    height: 500px;
    background: var(--accent-primary);
    top: -100px;
    right: -100px;
}

.sphere-2 {
    width: 400px;
    height: 400px;
    background: var(--accent-secondary);
    bottom: -50px;
    left: -100px;
    animation-delay: -5s;
}

@keyframes float {

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

    50% {
        transform: translate(30px, 40px);
    }
}

.profile-container {
    margin-bottom: 2rem;
    display: flex;
    justify-content: center;
}

.profile-image {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid rgba(56, 189, 248, 0.3);
    box-shadow: 0 0 50px rgba(56, 189, 248, 0.2);
    transition: var(--transition);
}

.profile-image:hover {
    transform: scale(1.05);
    border-color: var(--accent-primary);
    box-shadow: 0 0 70px rgba(56, 189, 248, 0.4);
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    z-index: 1;
}

.hero-subtitle {
    display: block;
    color: var(--accent-tertiary);
    font-weight: 600;
    margin-bottom: 1rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    font-size: 0.9rem;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 4.5rem;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    background: linear-gradient(to right, #fff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 4rem;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

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

/* Cards & Glassmorphism */
.glass-card {
    background: var(--surface-color);
    backdrop-filter: blur(12px);
    border: var(--glass-border);
    border-radius: 16px;
    padding: 2rem;
    transition: var(--transition);
}

.glass-card:hover {
    transform: translateY(-5px);
    background: var(--surface-hover);
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
}

/* Grids */
.about-grid,
.ai-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.card-icon,
.ai-icon {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.about-card h3,
.ai-card h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.about-card p,
.ai-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.ai-card ul {
    margin-top: 1rem;
    padding-left: 1rem;
}

.ai-card li {
    list-style-type: none;
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.ai-card li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
}

/* Timeline */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::after {
    content: '';
    position: absolute;
    width: 2px;
    background: rgba(255, 255, 255, 0.1);
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -1px;
}

.timeline-item {
    padding: 10px 40px;
    position: relative;
    width: 50%;
}

.timeline-item:nth-child(odd) {
    left: 0;
    text-align: right;
}

.timeline-item:nth-child(even) {
    left: 50%;
}

.timeline-dot {
    width: 20px;
    height: 20px;
    background: var(--bg-color);
    border: 2px solid var(--accent-primary);
    border-radius: 50%;
    position: absolute;
    top: 24px;
    right: -10px;
    z-index: 1;
}

.timeline-item:nth-child(even) .timeline-dot {
    left: -10px;
}

.timeline-date {
    color: var(--accent-primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

/* Roles */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 1.5rem;
}

.role-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.badge {
    background: rgba(52, 211, 153, 0.2);
    color: var(--accent-tertiary);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.role-date {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

/* Research Tabs */
.tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    font-family: var(--font-heading);
    font-size: 1rem;
    border-bottom: 2px solid transparent;
    transition: var(--transition);
}

.tab-btn.active {
    color: var(--accent-primary);
    border-bottom-color: var(--accent-primary);
}

.tab-content {
    display: none;
    animation: fadeIn 0.5s ease;
}

.tab-content.active {
    display: block;
}

.tags-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}

.tag-chip {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

.tag-chip:hover {
    background: rgba(56, 189, 248, 0.1);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* Skills */
.split-layout {
    display: flex;
    gap: 4rem;
}

.split-content {
    flex: 1;
}

.split-content h3 {
    font-family: var(--font-heading);
    margin-bottom: 2rem;
    font-size: 1.5rem;
}

.course-list li {
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--text-secondary);
}

.course-list i {
    color: var(--accent-secondary);
    width: 20px;
}

.skills-bar-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.skill-name {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    overflow: hidden;
}

.progress {
    height: 100%;
    background: var(--gradient-main);
    border-radius: 4px;
    transition: width 1s ease;
}

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

.contact-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 2rem;
}

.contact-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.5rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    color: var(--text-primary);
    transition: var(--transition);
}

.contact-btn:hover {
    background: var(--accent-primary);
    color: #fff;
}

.memberships {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    margin-top: 3rem;
}

.memberships h4 {
    color: var(--accent-tertiary);
    margin-bottom: 0.5rem;
}

.memberships p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

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

.reveal-text {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal-text.active {
    opacity: 1;
    transform: translateY(0);
}

.scroll-down {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0.7;
    transition: opacity 0.3s;
}

.mouse {
    width: 26px;
    height: 42px;
    border: 2px solid var(--text-primary);
    border-radius: 15px;
    position: relative;
}

.wheel {
    width: 4px;
    height: 8px;
    background: var(--text-primary);
    border-radius: 2px;
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 1.5s infinite;
}

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

    100% {
        transform: translate(-50%, 15px);
        opacity: 0;
    }
}

/* Responsive */
@media (max-width: 968px) {
    .hero-title {
        font-size: 3.5rem;
    }

    .timeline::after {
        left: 31px;
    }

    .timeline-item {
        width: 100%;
        padding-left: 70px;
        padding-right: 25px;
        text-align: left;
    }

    .timeline-item:nth-child(odd) {
        left: 0;
        text-align: left;
    }

    .timeline-item:nth-child(even) {
        left: 0;
    }

    .timeline-dot {
        left: 22px !important;
        right: auto;
    }

    .split-layout {
        flex-direction: column;
        gap: 2rem;
    }
}

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

    .nav-toggle {
        display: block;
        color: white;
        font-size: 1.5rem;
        z-index: 1001;
    }

    .nav-links.active {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(8, 16, 54, 0.98);
        /* Updated to match new bg */
        backdrop-filter: blur(20px);
        padding-top: 6rem;
        align-items: center;
        gap: 2rem;
        animation: fadeIn 0.3s ease;
    }

    .nav-link {
        font-size: 1.5rem;
    }

    .hamburger {
        display: block;
        width: 25px;
        height: 3px;
        background: white;
        position: relative;
        transition: all 0.3s ease-in-out;
    }

    .hamburger::before,
    .hamburger::after {
        content: '';
        position: absolute;
        width: 100%;
        height: 3px;
        background: white;
        left: 0;
        transition: all 0.3s ease-in-out;
    }

    .hamburger::before {
        top: -8px;
    }

    .hamburger::after {
        top: 8px;
    }

    /* Hamburger Animation when active (optional, handled by class later if needed, but simple is fine) */
    /* Hide custom cursor on touch devices */
    .cursor-dot,
    .cursor-outline {
        display: none;
    }

    body {
        cursor: auto;
    }
}

@media (max-width: 480px) {
    .section-title {
        font-size: 2rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
        gap: 1rem;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

    .profile-image {
        width: 150px;
        height: 150px;
    }

    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
    }

    .contact-links {
        flex-direction: column;
    }

    .contact-btn {
        width: 100%;
        justify-content: center;
    }
}

.mt-4 {
    margin-top: 1.5rem;
}