:root {
            --primary-gradient: linear-gradient(135deg, #1a2a6c, #b21f1f, #fdbb2d);
            --glass-bg: rgba(255, 255, 255, 0.95);
        }

        body {
            background: #111;
            font-family: 'Inter', system-ui, -apple-system, sans-serif;
            color: #ecf0f1;
        }

        .hero-section {
            background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('../images/code-hero.jpg');
            background-size: cover;
            background-position: center;
            padding: 4rem 1rem;
            color: white;
            text-align: center;
            margin-bottom: 2rem;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
        }

        .hero-title {
            font-size: 2.5rem;
            font-weight: 800;
            letter-spacing: -1px;
            margin: 0;
        }



        .presentation-list {
            max-width: 900px;
            margin: 0 auto;
            padding: 0 1rem 4rem;
        }

        .table-container {
            background: white;
            border-radius: 16px;
            padding: 1.5rem;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            margin-bottom: 2rem;
        }

        .table th {
            border-top: none;
            text-transform: uppercase;
            font-size: 0.75rem;
            letter-spacing: 1px;
            color: #6c757d;
            padding: 1rem;
        }

        .table td {
            padding: 1.25rem 1rem;
            vertical-align: middle;
            font-weight: 500;
        }

        .topic-cell {
            font-size: 1.05rem;
            color: #2d3436;
        }

        .link-btn {
            display: inline-block;
            padding: 0.5rem 1rem;
            background: #f1f2f6;
            color: #2d3436;
            text-decoration: none;
            border-radius: 8px;
            font-weight: 600;
            transition: all 0.3s ease;
            font-size: 0.9rem;
        }

        .link-btn:hover {
            background: #2d3436;
            color: white;
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }

        .reveal section li {
            font-size: 0.7em;
        }

        .reveal section code {
            font-size: 0.6em;
            line-height: 1.4em;
        }

        .reveal section ul code {
            font-size: 0.8em;
            line-height: 1.4em;
            font-weight: bolder;
        }

        .back-to-list {
            position: fixed;
            top: 20px;
            left: 20px;
            z-index: 1000;
            color: rgba(255, 255, 255, 0.6);
            text-decoration: none;
            font-size: 1.8rem;
            font-family: 'Inter', system-ui, sans-serif;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            background: rgba(0, 0, 0, 0.2);
            width: 44px;
            height: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .back-to-list:hover {
            color: #fff;
            background: rgba(255, 255, 255, 0.4);
            border-color: rgba(255, 255, 255, 0.6);
            transform: scale(1.15);
            box-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
        }