:root {
            /* Dark Theme (default) */
            --bg-primary: #0A0A0A;
            --bg-secondary: #1A1A1A;
            --bg-card: rgba(255,255,255,0.05);
            --text-primary: #FFFFFF;
            --text-secondary: #D1D5DB;
            --border-light: rgba(255,255,255,0.08);
            --border-heavy: rgba(255,255,255,0.2);
            --shadow-light: 0 4px 20px rgba(0,0,0,0.3);
            --shadow-heavy: 0 20px 60px rgba(0,0,0,0.4);
        }

        [data-theme="light"] {
            /* Light Theme */
            --bg-primary: #FFFFFF;
            --bg-secondary: #F8FAFC;
            --bg-card: rgba(255,255,255,0.8);
            --text-primary: #111827;
            --text-secondary: #4B5563;
            --border-light: rgba(0,0,0,0.08);
            --border-heavy: rgba(0,0,0,0.15);
            --shadow-light: 0 4px 20px rgba(0,0,0,0.08);
            --shadow-heavy: 0 20px 60px rgba(0,0,0,0.15);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
        }

        body {
            font-family: 'Inter', sans-serif;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-primary);
            overflow-x: hidden;
            scroll-behavior: smooth;
        }

        /* Theme Switcher */
        .theme-switcher {
            position: fixed;
            top: 40px;
            right: 40px;
            background: var(--bg-card);
            backdrop-filter: blur(20px);
            border: 1px solid var(--border-light);
            border-radius: 50px;
            padding: 12px;
            z-index: 1001;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: all 0.3s ease;
            box-shadow: var(--shadow-light);
        }

        .theme-switcher:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-heavy);
        }

        .theme-icon {
            font-size: 1.1rem;
        }

        /* Minimal Navbar */
        .navbar {
            position: fixed;
            top: 40px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--bg-card);
            backdrop-filter: blur(20px);
            padding: 16px 32px;
            border-radius: 50px;
            border: 1px solid var(--border-light);
            z-index: 1000;
        }

        .nav-links {
            display: flex;
            gap: 32px;
            list-style: none;
        }

        .nav-links a {
            color: var(--text-secondary);
            text-decoration: none;
            font-weight: 500;
            font-size: 0.95rem;
            padding: 12px 20px;
            border-radius: 25px;
            transition: all 0.3s ease;
            position: relative;
        }

        .nav-links a:hover {
            color: var(--text-primary);
            background: var(--border-heavy);
            transform: translateY(-1px);
        }

        /* Elegant Hero */
        .hero {
            min-height: 100vh;
            background: var(--bg-primary);
            display: flex;
            align-items: center;
            position: relative;
            padding: 120px 0;
        }

        .hero-content {
            max-width: 1600px;
            margin: 0 auto;
            padding: 0 60px;
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            gap: 120px;
            align-items: center;
        }

        .hero-main-text h1 {
            font-size: clamp(4rem, 10vw, 8rem);
            font-weight: 900;
            line-height: 1;
            margin-bottom: 20px;
            color: var(--text-primary);
            letter-spacing: -2px;
        }

        .hero-subtitle {
            font-size: clamp(1.5rem, 4vw, 2.5rem);
            font-weight: 300;
            margin-bottom: 24px;
            color: var(--text-secondary);
        }

        .hero-info {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            margin-bottom: 48px;
            font-size: 1.2rem;
            font-weight: 400;
        }

        .hero-info span {
            background: var(--bg-card);
            padding: 12px 24px;
            border-radius: 50px;
            border: 1px solid var(--border-light);
            color: var(--text-secondary);
        }

        .hero-description {
            font-size: 1.4rem;
            max-width: 550px;
            margin-bottom: 56px;
            color: var(--text-secondary);
        }

        .cta-buttons {
            display: flex;
            gap: 24px;
            flex-wrap: wrap;
        }

        .btn-modern {
            padding: 20px 40px;
            border-radius: 50px;
            font-size: 1.1rem;
            font-weight: 600;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 12px;
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            border: none;
        }

        .btn-primary {
            background: var(--text-primary);
            color: var(--bg-primary);
            box-shadow: var(--shadow-light);
        }

        .btn-primary:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-heavy);
        }

        .btn-secondary {
            background: transparent;
            color: var(--text-primary);
            border: 2px solid var(--border-heavy);
        }

        .btn-secondary:hover {
            border-color: var(--text-primary);
            transform: translateY(-2px);
        }

        /* Hero Photo */
        .hero-photo {
            position: relative;
            height: 500px;
            border-radius: 24px;
            overflow: hidden;
            background: var(--text-primary);
            box-shadow: var(--shadow-heavy);
        }

        .hero-photo-icon {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            font-size: 14rem;
            color: var(--bg-primary);
            filter: drop-shadow(0 8px 24px rgba(0,0,0,0.3));
        }

        /* Sections */
        .section {
            padding: 160px 60px;
            max-width: 1600px;
            margin: 0 auto;
        }

        .section:nth-child(odd) {
            background: var(--bg-secondary);
        }

        .section-title {
            font-size: clamp(3rem, 6vw, 5rem);
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 100px;
            text-align: center;
            letter-spacing: -1px;
        }

        /* Timeline */
        .timeline {
            max-width: 1400px;
            margin: 0 auto;
        }

        .timeline-item {
            display: grid;
            grid-template-columns: 180px 1fr;
            gap: 60px;
            margin-bottom: 120px;
            padding: 0 40px;
            opacity: 0;
            transform: translateY(80px);
            position: relative;
        }

        .timeline-item::before {
            content: '';
            position: absolute;
            left: 90px;
            top: 0;
            bottom: -60px;
            width: 3px;
            background: var(--border-heavy);
            border-radius: 2px;
        }

        .timeline-date {
            font-size: 1.3rem;
            color: var(--text-primary);
            font-weight: 700;
            writing-mode: vertical-rl;
            text-orientation: mixed;
            letter-spacing: 2px;
            align-self: center;
            text-align: center;
        }

        .timeline-content {
            background: var(--bg-card);
            backdrop-filter: blur(20px);
            padding: 64px;
            border-radius: 32px;
            border: 1px solid var(--border-light);
            position: relative;
            overflow: hidden;
        }

        .timeline-content::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: var(--text-primary);
        }

        .timeline-header {
            display: flex;
            gap: 24px;
            align-items: flex-start;
            margin-bottom: 32px;
        }

        .timeline-badge {
            width: 64px;
            height: 64px;
            background: var(--text-primary);
            border-radius: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--bg-primary);
            font-weight: 700;
            font-size: 1rem;
            flex-shrink: 0;
            box-shadow: var(--shadow-light);
        }

        .timeline-title {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 8px;
            line-height: 1.2;
        }

        .timeline-company {
            font-size: 1.4rem;
            font-weight: 600;
            color: var(--text-secondary);
            margin-bottom: 24px;
        }

        .timeline-desc {
            font-size: 1.2rem;
            line-height: 1.8;
            color: var(--text-secondary);
            margin-bottom: 32px;
        }

        .timeline-achievements {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 16px;
        }

        .achievement {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 20px 24px;
            background: var(--bg-card);
            border-radius: 16px;
            border: 1px solid var(--border-light);
            font-weight: 500;
            color: var(--text-secondary);
            transition: all 0.3s ease;
        }

        .achievement:hover {
            background: var(--border-heavy);
            transform: translateX(8px);
        }

        .achievement-icon {
            width: 44px;
            height: 44px;
            background: var(--text-primary);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--bg-primary);
            font-size: 1rem;
            font-weight: 700;
        }

        /* Content cards */
        .content-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
            gap: 48px;
        }

        .content-card {
            background: var(--bg-card);
            backdrop-filter: blur(20px);
            padding: 56px;
            border-radius: 24px;
            border: 1px solid var(--border-light);
            text-align: center;
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            position: relative;
        }

        .content-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: var(--text-primary);
            border-radius: 24px 24px 0 0;
        }

        .content-card:hover {
            transform: translateY(-8px);
            border-color: var(--border-heavy);
            box-shadow: var(--shadow-light);
        }

        .skill-item {
            margin-bottom: 40px;
            text-align: left;
        }

        .skill-label {
            font-weight: 600;
            margin-bottom: 16px;
            display: flex;
            justify-content: space-between;
            font-size: 1.1rem;
            color: var(--text-secondary);
        }

        .skill-bar {
            height: 12px;
            background: var(--border-light);
            border-radius: 6px;
            overflow: hidden;
            border: 1px solid var(--border-heavy);
        }

        .skill-progress {
            height: 100%;
            background: var(--text-primary);
            border-radius: 6px;
            transition: width 2s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .icon-large, .contact-icon {
            font-size: 4rem;
            color: var(--text-primary);
            margin-bottom: 28px;
        }

        @media (max-width: 1200px) {
            .hero-content { 
                grid-template-columns: 1fr; 
                text-align: center;
                gap: 80px;
                padding: 0 40px;
            }
            .hero-photo { margin: 0 auto; }
        }

        @media (max-width: 768px) {
            .theme-switcher { top: 20px; right: 20px; }
            .navbar { 
                top: 20px; 
                padding: 12px 24px; 
                border-radius: 25px;
            }
            .hero { padding: 100px 0; min-height: 90vh; }
            .section { padding: 120px 24px; }
            .timeline-item { 
                grid-template-columns: 1fr; 
                gap: 40px;
                text-align: center;
            }
            .timeline-item::before { display: none; }
        }