:root {
            --primary-color: #2563eb;
            --secondary-color: #1e40af;
            --accent-color: #3b82f6;
            --text-primary: #1f2937;
            --text-secondary: #6b7280;
            --text-light: #9ca3af;
            --bg-primary: #ffffff;
            --bg-secondary: #f8fafc;
            --bg-accent: #f1f5f9;
            --border-color: #e5e7eb;
            --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
            --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
            --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
            --radius-sm: 0.375rem;
            --radius-md: 0.5rem;
            --radius-lg: 0.75rem;
            --radius-xl: 1rem;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            line-height: 1.6;
            color: var(--text-primary);
            background-color: var(--bg-primary);
        }

        /* Navigation */
        .navbar {
            position: fixed;
            top: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-color);
            z-index: 1000;
            transition: all 0.3s ease;
        }

        .navbar.scrolled {
            background: rgba(255, 255, 255, 0.98);
            box-shadow: var(--shadow-md);
        }

        .nav-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 4rem;
        }

        .nav-brand {
            font-weight: 600;
            font-size: 1.25rem;
            color: var(--text-primary);
            text-decoration: none;
        }

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

        .nav-link {
            color: var(--text-secondary);
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s ease;
            position: relative;
        }

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

        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: -0.5rem;
            left: 0;
            right: 0;
            height: 2px;
            background: var(--primary-color);
            border-radius: 1px;
        }

        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--text-primary);
        }

        /* Hero Section */
        .hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            padding: 8rem 2rem 4rem;
            background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-accent) 100%);
        }

        .hero-container {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1fr 2fr;
            gap: 4rem;
            align-items: center;
        }

        .hero-image {
            text-align: center;
        }

        .profile-img {
            width: 280px;
            height: 280px;
            border-radius: 50%;
            object-fit: cover;
            border: 4px solid white;
            box-shadow: var(--shadow-lg);
            transition: transform 0.3s ease;
        }

        .profile-img:hover {
            transform: scale(1.05);
        }

        .social-links {
            display: flex;
            justify-content: center;
            gap: 1rem;
            margin-top: 2rem;
        }

        .social-link {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 3rem;
            height: 3rem;
            background: white;
            color: var(--text-secondary);
            border-radius: 50%;
            text-decoration: none;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
        }

        .social-link:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
            color: var(--primary-color);
        }

        .hero-content h1 {
            font-size: 3.5rem;
            font-weight: 700;
            margin-bottom: 1rem;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-subtitle {
            font-size: 1.5rem;
            color: var(--text-secondary);
            margin-bottom: 2rem;
            font-weight: 500;
        }

        .hero-description {
            font-size: 1.125rem;
            line-height: 1.7;
            color: var(--text-secondary);
            margin-bottom: 2rem;
        }

        .research-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 0.75rem;
            margin-bottom: 2rem;
        }

        .tag {
            background: var(--primary-color);
            color: white;
            padding: 0.5rem 1rem;
            border-radius: var(--radius-lg);
            font-size: 0.9rem;
            font-weight: 500;
        }

        /* Sections */
        .section {
            padding: 5rem 2rem;
        }

        .section-container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .section-header {
            text-align: center;
            margin-bottom: 4rem;
        }

        .section-title {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--text-primary);
        }

        .section-subtitle {
            font-size: 1.25rem;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
        }

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

        .timeline::before {
            content: '';
            position: absolute;
            left: 50%;
            top: 0;
            bottom: 0;
            width: 2px;
            background: var(--border-color);
            transform: translateX(-50%);
        }

        .timeline-item {
            position: relative;
            margin: 2rem 0;
            background: white;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: all 0.3s ease;
        }

        .timeline-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .timeline-item::before {
            content: '';
            position: absolute;
            left: 50%;
            top: 1.5rem;
            width: 1rem;
            height: 1rem;
            background: var(--primary-color);
            border-radius: 50%;
            transform: translateX(-50%);
            border: 3px solid white;
            box-shadow: var(--shadow-sm);
        }

        .timeline-content {
            padding: 2rem;
            margin-left: calc(50% + 2rem);
        }

        .timeline-item:nth-child(even) .timeline-content {
            margin-left: 0;
            margin-right: calc(50% + 2rem);
            text-align: right;
        }

        .timeline-date {
            color: var(--primary-color);
            font-weight: 600;
            font-size: 0.9rem;
            margin-bottom: 0.5rem;
        }

        .timeline-title {
            font-size: 1.125rem;
            font-weight: 600;
            color: var(--text-primary);
        }

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

        .project-card {
            background: var(--bg-primary);
            border-radius: var(--radius-lg);
            padding: 2rem;
            box-shadow: var(--shadow-md);
            transition: all 0.3s ease;
            border: 1px solid var(--border-color);
        }

        .project-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
        }

        .project-title {
            font-size: 1.5rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 1rem;
        }

        .project-description {
            color: var(--text-secondary);
            margin-bottom: 1.5rem;
            line-height: 1.6;
        }

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

        .project-link {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.75rem 1.5rem;
            background: var(--primary-color);
            color: white;
            text-decoration: none;
            border-radius: var(--radius-md);
            font-weight: 500;
            transition: all 0.3s ease;
        }

        .project-link:hover {
            background: var(--secondary-color);
            transform: translateY(-2px);
        }

        /* Publications */
        .publication {
            background: white;
            border-radius: var(--radius-lg);
            padding: 2rem;
            margin-bottom: 2rem;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: all 0.3s ease;
        }

        .publication:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .pub-year {
            font-size: 2rem;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 2rem;
            text-align: center;
        }

        .pub-title {
            font-size: 1.25rem;
            font-weight: 600;
            margin-bottom: 0.75rem;
            color: var(--text-primary);
        }

        .pub-authors {
            margin-bottom: 0.5rem;
            color: var(--text-secondary);
        }

        .pub-venue {
            font-weight: 600;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }

        .pub-links {
            display: flex;
            gap: 0.75rem;
            flex-wrap: wrap;
        }

        .pub-link {
            padding: 0.5rem 1rem;
            border-radius: var(--radius-sm);
            text-decoration: none;
            font-size: 0.9rem;
            font-weight: 500;
            transition: all 0.3s ease;
        }

        .pub-link.paper {
            background: var(--primary-color);
            color: white;
        }

        .pub-link.code {
            background: #10b981;
            color: white;
        }

        .pub-link.data {
            background: #f59e0b;
            color: white;
        }

        .pub-link:hover {
            transform: translateY(-1px);
            opacity: 0.9;
        }

        /* Footer */
        .footer {
            background: var(--text-primary);
            color: white;
            text-align: center;
            padding: 2rem;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: white;
                flex-direction: column;
                padding: 1rem 2rem;
                box-shadow: var(--shadow-md);
            }

            .nav-links.active {
                display: flex;
            }

            .mobile-menu-btn {
                display: block;
            }

            .hero-container {
                grid-template-columns: 1fr;
                text-align: center;
                gap: 2rem;
            }

            .hero-content h1 {
                font-size: 2.5rem;
            }

            .timeline::before {
                left: 1.5rem;
            }

            .timeline-item::before {
                left: 1.5rem;
            }

            .timeline-content {
                margin-left: 4rem;
            }

            .timeline-item:nth-child(even) .timeline-content {
                margin-left: 4rem;
                margin-right: 0;
                text-align: left;
            }

            .section-title {
                font-size: 2rem;
            }

            .pub-links {
                justify-content: center;
            }
        }

        /* Animations */
        .fade-in {
            opacity: 0;
            transform: translateY(30px);
            transition: all 0.8s ease;
        }

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

        /* Scroll Progress */
        .scroll-progress {
            position: fixed;
            top: 0;
            left: 0;
            height: 3px;
            background: var(--primary-color);
            z-index: 1001;
            transition: width 0.1s ease;
        }