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

            :root {
                --bg-primary: #f7fafb;
                --bg-secondary: #ffffff;
                --accent-c: #1B80CF;
                --accent-sys: #0d6eaf;
                --accent-light: #5ca4db;
                --accent-mem: #48bfe3;
                --text-primary: #1a2332;
                --text-secondary: #4a5568;
                --shadow-c: rgba(27, 128, 207, 0.15);
                --shadow-sys: rgba(13, 110, 175, 0.2);
            }

            body {
                font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
                background: linear-gradient(135deg, var(--bg-primary) 0%, #e6f4f9 100%);
                color: var(--text-primary);
                line-height: 1.7;
                min-height: 100vh;
            }

            /* Navigation */
            nav {
                position: fixed;
                top: 0;
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.94);
                -webkit-backdrop-filter: blur(12px);
                backdrop-filter: blur(12px);
                padding: 1rem 2rem;
                box-shadow: 0 2px 20px var(--shadow-c);
                z-index: 1000;
                border-bottom: 1px solid rgba(27, 128, 207, 0.1);
            }

            .nav-content {
                max-width: 1400px;
                margin: 0 auto;
                display: flex;
                justify-content: space-between;
                align-items: center;
                flex-wrap: wrap;
                gap: 1rem;
            }

            .nav-title {
                font-size: 1.1rem;
                font-weight: 600;
                color: var(--accent-c);
                text-decoration: none;
                letter-spacing: -0.01em;
            }

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

            .nav-links a {
                color: var(--text-secondary);
                text-decoration: none;
                font-size: 0.95rem;
                font-weight: 500;
                transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
                padding: 0.4rem 0.8rem;
                border-radius: 6px;
                position: relative;
                z-index: 1;
            }

            .nav-links a:hover {
                color: var(--accent-c);
                background: rgba(27, 128, 207, 0.08);
            }

            /* Hero Section */
            .hero {
                max-width: 1400px;
                margin: 0 auto;
                padding: 140px 2rem 80px;
                display: grid;
                grid-template-columns: 1fr 420px;
                gap: 4rem;
                align-items: center;
            }

            .hero-content h1 {
                font-size: 4.5rem;
                font-weight: 800;
                color: var(--text-primary);
                line-height: 1.1;
                letter-spacing: -0.03em;
                margin-bottom: 1.5rem;
                background: linear-gradient(135deg, var(--accent-sys) 0%, var(--accent-c) 100%);
                -webkit-background-clip: text;
                -webkit-text-fill-color: transparent;
                background-clip: text;
            }

            .hero-content .subtitle {
                font-size: 1.5rem;
                color: var(--text-secondary);
                margin-bottom: 1rem;
                font-weight: 500;
            }

            .hero-content .year {
                font-size: 1.2rem;
                color: var(--accent-c);
                font-weight: 600;
                margin-bottom: 2rem;
            }

            .hero-description {
                font-size: 1.15rem;
                color: var(--text-secondary);
                line-height: 1.8;
                padding: 2rem;
                background: rgba(255, 255, 255, 0.8);
                border-radius: 16px;
                border: 1px solid rgba(27, 128, 207, 0.12);
                box-shadow: 0 4px 20px var(--shadow-c);
            }

            /* C Programming SVG */
            .hero-visual {
                position: relative;
            }

            .c-visual-svg {
                width: 100%;
                height: auto;
                filter: drop-shadow(0 10px 30px var(--shadow-c));
            }

            /* Content Container */
            .content-wrapper {
                max-width: 1400px;
                margin: 0 auto;
                padding: 4rem 2rem;
            }

            /* Section Styling */
            .section {
                margin-bottom: 5rem;
            }

            .section-header {
                display: flex;
                align-items: center;
                gap: 1rem;
                margin-bottom: 3rem;
            }

            .section-icon {
                width: 50px;
                height: 50px;
                background: linear-gradient(135deg, var(--accent-c), var(--accent-mem));
                border-radius: 12px;
                display: flex;
                align-items: center;
                justify-content: center;
                animation: iconPulse 3s ease-in-out infinite;
            }

            @keyframes iconPulse {

                0%,
                100% {
                    transform: scale(1);
                    box-shadow: 0 4px 15px var(--shadow-c);
                }

                50% {
                    transform: scale(1.08);
                    box-shadow: 0 6px 25px var(--shadow-sys);
                }
            }

            .section h2 {
                font-size: 2.5rem;
                font-weight: 700;
                color: var(--text-primary);
                letter-spacing: -0.02em;
            }

            /* Bento Grid Layout */
            .bento-grid {
                display: grid;
                grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
                gap: 2rem;
                margin-bottom: 2rem;
            }

            .bento-grid.featured {
                grid-template-columns: repeat(2, 1fr);
            }

            .card {
                background: var(--bg-secondary);
                border-radius: 20px;
                padding: 2.5rem;
                border: 2px solid rgba(27, 128, 207, 0.1);
                transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
                position: relative;
                overflow: hidden;
            }

            .card::before {
                content: '';
                position: absolute;
                top: 0;
                left: 0;
                right: 0;
                bottom: 0;
                background:
                    linear-gradient(135deg, rgba(27, 128, 207, 0.03) 0%, transparent 50%),
                    radial-gradient(circle at 80% 20%, rgba(72, 191, 227, 0.04) 0%, transparent 50%);
                opacity: 0;
                transition: opacity 0.4s ease;
                pointer-events: none;
                z-index: 0;
            }

            .card:hover::before {
                opacity: 1;
            }

            .card:hover {
                transform: translateY(-12px) scale(1.02);
                border-color: var(--accent-c);
                box-shadow:
                    0 20px 40px var(--shadow-c),
                    0 10px 20px var(--shadow-sys);
            }

            .card.featured {
                grid-column: span 1;
            }

            .card.span-2 {
                grid-column: span 2;
                background: linear-gradient(135deg, rgba(27, 128, 207, 0.05) 0%, rgba(255, 255, 255, 0.9) 100%);
            }

            .card-icon {
                width: 94px;
                height: 94px;
                background: linear-gradient(135deg, var(--accent-light), var(--accent-c));
                border-radius: 48% 52% 50% 50%;
                margin-bottom: 1.5rem;
                display: flex;
                align-items: center;
                justify-content: center;
                animation: morphC 6s ease-in-out infinite;
                transition: all 0.4s ease;
                position: relative;
                z-index: 1;
            }

            .card:hover .card-icon {
                transform: scale(1.15) rotate(-8deg);
                border-radius: 52% 48% 50% 50%;
            }

            @keyframes morphC {

                0%,
                100% {
                    border-radius: 48% 52% 50% 50%;
                }

                25% {
                    border-radius: 50% 48% 52% 50%;
                }

                50% {
                    border-radius: 52% 50% 48% 52%;
                }

                75% {
                    border-radius: 50% 52% 50% 48%;
                }
            }

            .card-badge {
                display: inline-block;
                padding: 0.4rem 1rem;
                background: rgba(27, 128, 207, 0.12);
                color: var(--accent-sys);
                border-radius: 20px;
                font-size: 0.85rem;
                font-weight: 600;
                margin-bottom: 1rem;
                letter-spacing: 0.02em;
                position: relative;
                z-index: 1;
            }

            .card h3 {
                font-size: 1.6rem;
                font-weight: 700;
                color: var(--text-primary);
                margin-bottom: 0.8rem;
                letter-spacing: -0.01em;
                position: relative;
                z-index: 1;
            }

            .card p {
                font-size: 1.05rem;
                color: var(--text-secondary);
                line-height: 1.7;
                margin-bottom: 1.5rem;
                position: relative;
                z-index: 1;
            }

            .card a {
                color: var(--accent-c);
                text-decoration: none;
                font-weight: 600;
                display: inline-flex;
                align-items: center;
                gap: 0.5rem;
                transition: all 0.3s ease;
                position: relative;
                z-index: 1;
            }

            .card a:hover {
                color: var(--accent-sys);
                gap: 0.8rem;
            }

            .card a::after {
                content: '→';
                font-size: 1.2rem;
                transition: transform 0.3s ease;
            }

            .card a:hover::after {
                transform: translateX(4px);
            }

            /* GitHub Link Special Styling */
            .github-card {
                background: linear-gradient(135deg, #f6f8fa 0%, #ffffff 100%);
                border: 2px solid rgba(27, 128, 207, 0.15);
            }

            /* Questions Section Special Styling */
            .questions-section {
                background: rgba(255, 255, 255, 0.6);
                border-radius: 24px;
                padding: 3rem;
                border: 2px solid rgba(27, 128, 207, 0.08);
            }

            .year-group {
                margin-bottom: 2.5rem;
            }

            .year-group h3 {
                font-size: 1.8rem;
                color: var(--accent-c);
                margin-bottom: 1.2rem;
                font-weight: 700;
            }

            .questions-list {
                list-style: none;
                display: grid;
                grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
                gap: 1rem;
            }

            .questions-list li {
                background: rgba(255, 255, 255, 0.8);
                padding: 1rem 1.5rem;
                border-radius: 12px;
                border: 1px solid rgba(27, 128, 207, 0.1);
                transition: all 0.3s ease;
            }

            .questions-list li:hover {
                transform: translateX(8px);
                border-color: var(--accent-c);
                box-shadow: 0 4px 12px var(--shadow-c);
            }

            .questions-list a {
                color: var(--accent-c);
                text-decoration: none;
                font-weight: 500;
                display: flex;
                align-items: center;
                gap: 0.5rem;
            }

            .questions-list a::before {
                content: '📄';
                font-size: 1.2rem;
            }

            /* Footer */
            footer {
                background: rgba(255, 255, 255, 0.8);
                -webkit-backdrop-filter: blur(12px);
                backdrop-filter: blur(12px);
                padding: 3rem 2rem;
                margin-top: 6rem;
                border-top: 2px solid rgba(27, 128, 207, 0.1);
            }

            .footer-content {
                max-width: 1400px;
                margin: 0 auto;
                display: flex;
                justify-content: space-between;
                align-items: center;
                flex-wrap: wrap;
                gap: 2rem;
            }

            .footer-links {
                display: flex;
                gap: 2rem;
            }

            .footer-links a {
                color: var(--text-secondary);
                text-decoration: none;
                font-weight: 500;
                transition: all 0.3s ease;
                padding: 0.5rem 1rem;
                border-radius: 8px;
                position: relative;
                z-index: 1;
            }

            .footer-links a:hover {
                color: var(--accent-c);
                background: rgba(27, 128, 207, 0.08);
            }

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

            /* Responsive Design */
            @media (max-width: 1200px) {
                .hero {
                    grid-template-columns: 1fr;
                    gap: 3rem;
                }

                .hero-visual {
                    max-width: 420px;
                    margin: 0 auto;
                }

                .bento-grid.featured {
                    grid-template-columns: 1fr;
                }

                .card.span-2 {
                    grid-column: span 1;
                }
            }

            @media (max-width: 768px) {
                .hero-content h1 {
                    font-size: 2.75rem;
                }

                .hero-content .subtitle {
                    font-size: 1.2rem;
                }

                .section h2 {
                    font-size: 1.8rem;
                }

                .bento-grid,
                .bento-grid.featured {
                    grid-template-columns: 1fr;
                }

                .card.span-2 {
                    grid-column: span 1;
                }

                .nav-content {
                    flex-direction: column;
                    align-items: flex-start;
                }

                .nav-links {
                    flex-wrap: wrap;
                    gap: 1rem;
                }

                .footer-content {
                    flex-direction: column;
                    text-align: center;
                }

                .questions-section {
                    padding: 2rem;
                }

                .questions-list {
                    grid-template-columns: 1fr;
                }

                .questions-list li:hover {
                    transform: translateX(4px);
                }
            }