:root {
    --bg-main: #0a0a0f;
    --bg-alt: #12121a;
    --bg-card: rgba(25, 25, 35, 0.6);
    --border-color: rgba(255, 255, 255, 0.1);
    
    --text-main: #ffffff;
    --text-muted: #a0a0b0;
    
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --gradient-primary: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    
    --font-sans: 'Inter', sans-serif;
    --font-heading: 'Outfit', sans-serif;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.2;
}

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

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--text-main);
    text-decoration: none;
    letter-spacing: -0.5px;
}

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

.nav-link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition);
}

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

.btn-nav {
    background: var(--gradient-primary);
    color: white !important;
    padding: 0.5rem 1.2rem;
    border-radius: 50px;
    font-weight: 600;
}

.btn-nav:hover {
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.4);
    transform: translateY(-2px);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-main);
    cursor: pointer;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.5rem;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    box-shadow: 0 8px 25px rgba(139, 92, 246, 0.4);
    transform: translateY(-2px);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

.w-full {
    width: 100%;
    justify-content: center;
}

/* General Layout */
main {
    padding-top: 80px;
}

.section {
    padding: 6rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.alt-bg {
    background-color: var(--bg-alt);
    max-width: 100%;
    padding: 6rem 0;
}

.alt-bg > * {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
    animation: fadeUp 1s ease-out;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.section-header p {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto;
}

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

.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Hero Section */
.hero {
    min-height: calc(100vh - 80px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 4rem 2rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.15) 0%, rgba(10, 10, 15, 0) 70%);
    z-index: -1;
    pointer-events: none;
}

.hero-content {
    max-width: 800px;
    margin-bottom: 4rem;
    animation: fadeUp 1s ease-out;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.avatar-placeholder {
    width: 130px;
    height: 130px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    box-shadow: 0 10px 30px rgba(139, 92, 246, 0.3);
    border: 3px solid var(--bg-main);
    overflow: hidden;
}

.avatar-placeholder i {
    width: 40px;
    height: 40px;
    color: white;
}

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

.hero-badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    background: rgba(139, 92, 246, 0.1);
    color: var(--accent-purple);
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 1.8rem;
    color: var(--text-main);
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.hero-description {
    font-size: 1.15rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    max-width: 750px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* Hero Cards */
.hero-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    width: 100%;
    max-width: 900px;
    animation: fadeUp 1.2s ease-out;
}

.identity-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 2.5rem;
    border-radius: 20px;
    text-decoration: none;
    color: var(--text-main);
    transition: var(--transition);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
    text-align: left;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.identity-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.identity-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    border-color: rgba(255, 255, 255, 0.2);
}

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

.card-icon {
    width: 60px;
    height: 60px;
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    background: rgba(255, 255, 255, 0.05);
}

.academic-card .card-icon { color: var(--accent-blue); }
.creator-card .card-icon { color: var(--accent-purple); }

.identity-card h3 {
    font-size: 1.4rem;
    margin-bottom: 0.5rem;
}

.identity-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Academic Section */
.academic-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.grid-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 2rem;
    border-radius: 16px;
    transition: var(--transition);
}

.grid-card:hover {
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-5px);
}

.card-icon-large {
    color: var(--accent-blue);
    width: 32px;
    height: 32px;
    margin-bottom: 1.5rem;
}

.grid-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
}

.grid-card p {
    color: var(--text-muted);
}

.tag-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag-list li {
    background: rgba(59, 130, 246, 0.1);
    color: #93c5fd;
    padding: 0.3rem 0.8rem;
    border-radius: 50px;
    font-size: 0.85rem;
    border: 1px solid rgba(59, 130, 246, 0.2);
}

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

.bullet-list li {
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

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

/* Publications */
.publications-section h3 {
    margin-bottom: 0.5rem;
    font-size: 1.5rem;
}

.pub-note {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 2rem;
}

.publication-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.pub-card {
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 12px;
    border-left: 4px solid var(--accent-blue);
}

.pub-card h4 {
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
}

.pub-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* AI Creator Section */
.creator-stats {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.social-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    min-width: 200px;
    transition: var(--transition);
    text-decoration: none;
    color: var(--text-main);
    text-align: center;
}

.social-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-purple);
    box-shadow: 0 10px 30px rgba(139, 92, 246, 0.15);
}

.social-card i {
    width: 32px;
    height: 32px;
    color: var(--accent-purple);
    margin-bottom: 1rem;
    transition: transform 0.3s ease;
}

.social-card:hover i {
    transform: scale(1.1);
}

.social-card span {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.3rem;
}

.social-desc {
    color: var(--text-muted) !important;
    font-family: var(--font-sans) !important;
    font-size: 0.85rem !important;
    font-weight: 400 !important;
}

.content-topics {
    display: flex;
    justify-content: center;
    gap: 0.8rem;
    flex-wrap: wrap;
    margin-bottom: 4rem;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.topic-tag {
    padding: 0.5rem 1rem;
    background: rgba(139, 92, 246, 0.1);
    color: #c4b5fd;
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: 50px;
    font-size: 0.9rem;
    transition: var(--transition);
}

.topic-tag:hover {
    background: rgba(139, 92, 246, 0.2);
    transform: translateY(-2px);
}

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

.video-card {
    background: var(--bg-main);
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    cursor: pointer;
    display: flex;
    flex-direction: column;
}

.video-card:hover {
    transform: translateY(-5px);
    border-color: rgba(139, 92, 246, 0.5);
    box-shadow: 0 10px 30px rgba(139, 92, 246, 0.15);
}

.video-thumbnail {
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.thumb-1 { background: linear-gradient(135deg, #1e1e2f, #2a2a4a); }
.thumb-2 { background: linear-gradient(135deg, #2f1e2a, #4a2a3a); }
.thumb-3 { background: linear-gradient(135deg, #1e2f2a, #2a4a3a); }

.video-label {
    position: absolute;
    top: 1rem;
    left: 1rem;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
    padding: 0.3rem 0.8rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    color: white;
}

.video-thumbnail i {
    width: 50px;
    height: 50px;
    color: rgba(255, 255, 255, 0.8);
    transition: var(--transition);
    background: rgba(0,0,0,0.4);
    border-radius: 50%;
}

.video-card:hover .video-thumbnail i {
    transform: scale(1.15);
    color: white;
    box-shadow: 0 0 20px rgba(139, 92, 246, 0.5);
}

.video-category {
    display: inline-block;
    padding: 0 1.5rem;
    color: var(--accent-purple);
    font-size: 0.85rem;
    font-weight: 600;
    margin-top: 0.5rem;
}

.video-card h4 {
    padding: 1.5rem 1.5rem 0.2rem;
    font-size: 1.2rem;
}

.video-card p {
    padding: 0.5rem 1.5rem 1.5rem;
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Blog Section */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.blog-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.blog-card:hover {
    transform: translateY(-5px);
    border-color: rgba(255, 255, 255, 0.2);
}

.blog-image {
    height: 180px;
    background-size: cover;
    background-position: center;
}

.trend-bg { background: linear-gradient(135deg, #2b1055, #7597de); }
.research-bg { background: linear-gradient(135deg, #102d55, #10554c); }
.teach-bg { background: linear-gradient(135deg, #551010, #de7575); }
.physical-bg { background: linear-gradient(135deg, #4f46e5, #0ea5e9); }

.blog-content {
    padding: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.blog-category {
    font-size: 0.8rem;
    color: var(--accent-blue);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

.blog-card h3 {
    margin: 0.6rem 0;
    font-size: 1.2rem;
}

.blog-card p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
    flex-grow: 1;
}

.read-more {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-main);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    transition: var(--transition);
    margin-top: auto;
}

.read-more i {
    width: 16px;
    height: 16px;
    transition: transform 0.3s ease;
}

.read-more:hover i {
    transform: translateX(5px);
    color: var(--accent-blue);
}

/* Contact Section */
.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.contact-info h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.contact-info > p {
    color: var(--text-muted);
    margin-bottom: 3rem;
    font-size: 1.05rem;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-bottom: 3rem;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    text-decoration: none;
    color: var(--text-main);
    transition: var(--transition);
}

a.contact-item:hover {
    transform: translateX(5px);
}

a.contact-item:hover i {
    color: var(--accent-purple);
    transform: scale(1.1);
}

.non-clickable {
    cursor: default;
}

.contact-item i {
    width: 24px;
    height: 24px;
    color: var(--accent-blue);
    margin-top: 0.2rem;
    transition: var(--transition);
}

.contact-item h4 {
    font-size: 1.1rem;
    margin-bottom: 0.2rem;
}

.contact-item span {
    color: var(--text-muted);
}

.affiliation-text {
    font-size: 0.95rem;
    line-height: 1.8;
}

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

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
    text-decoration: none;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

/* Form */
.contact-form {
    background: var(--bg-main);
    padding: 3rem;
    border-radius: 20px;
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    font-size: 0.95rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-main);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-blue);
    background: rgba(59, 130, 246, 0.05);
}

/* Footer */
footer {
    padding: 2rem;
    text-align: center;
    border-top: 1px solid var(--border-color);
    background: var(--bg-main);
}

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

/* Responsive */
@media (max-width: 992px) {
    .contact-container {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: 3.5rem;
    }
    
    .creator-stats {
        flex-direction: column;
        align-items: center;
    }
    
    .social-card {
        width: 100%;
        max-width: 400px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero-cards {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: 2.8rem;
    }
    
    .hero-subtitle {
        font-size: 1.4rem;
    }
    
    .section {
        padding: 4rem 1.5rem;
    }
    
    .contact-form {
        padding: 2rem;
    }
    
    .hero-cta {
        flex-direction: column;
        width: 100%;
        max-width: 300px;
    }
    
    .hero-cta .btn {
        width: 100%;
        justify-content: center;
    }
}