body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            margin: 0;
            background-color: #f9fafb;
        }

        /* App Layout */
        .app {
            display: flex;
            min-height: 100vh;
        }

        .app__header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 4rem;
            background: white;
            border-bottom: 1px solid #e5e7eb;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 2rem;
            z-index: 100;
            transition: all 0.3s ease;
        }

        .app__header--with-sidebar {
            left: 16rem;
        }

        .app__header--collapsed {
            left: 4rem;
        }

        .header__left {
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .header__toggle {
            background: none;
            border: none;
            padding: 0.5rem;
            cursor: pointer;
            border-radius: 0.375rem;
            transition: background-color 0.2s;
        }

        .header__toggle:hover {
            background-color: #f3f4f6;
        }

        .header__title {
            font-size: 1.125rem;
            font-weight: 600;
            color: #1f2937;
            margin: 0;
        }

        .app__content {
            flex: 1;
            padding: 6rem 2rem 2rem 2rem;
            transition: all 0.3s ease;
            min-width: 0;
        }

        .app__content--with-sidebar {
            margin-left: 16rem;
        }

        .app__content--collapsed {
            margin-left: 4rem;
        }

        /* Demo Content Styles */
        .content-card {
            background: white;
            border-radius: 0.5rem;
            padding: 2rem;
            margin-bottom: 2rem;
            box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
        }

        .content-card h1 {
            color: #1f2937;
            margin-bottom: 0.5rem;
        }

        .content-card h2 {
            color: #1f2937;
            margin-bottom: 1rem;
            border-bottom: 2px solid #e5e7eb;
            padding-bottom: 0.5rem;
        }

        .demo-controls {
            display: flex;
            gap: 1rem;
            margin: 1rem 0;
            flex-wrap: wrap;
        }

        .demo-button {
            padding: 0.5rem 1rem;
            border: 1px solid #d1d5db;
            border-radius: 0.375rem;
            background: white;
            cursor: pointer;
            font-size: 0.875rem;
            transition: all 0.2s;
        }

        .demo-button:hover {
            background: #f9fafb;
            border-color: #9ca3af;
        }

        .demo-button--primary {
            background: #3b82f6;
            color: white;
            border-color: #3b82f6;
        }

        .demo-button--primary:hover {
            background: #2563eb;
        }

        /* Stats Grid */
        .aiab-stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin: 2rem 0;
        }

        .aiab-stat-card {
            background: white;
            padding: 1.5rem;
            border-radius: 0.5rem;
            box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
            text-align: center;
        }

        .aiab-stat-card__number {
            font-size: 2rem;
            font-weight: 700;
            color: #3b82f6;
            display: block;
        }

        .aiab-stat-card__label {
            color: #6b7280;
            font-size: 0.875rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }

        /* Responsive adjustments */
        @media (max-width: 768px) {
            .app__header--with-sidebar,
            .app__header--collapsed {
                left: 0;
            }

            .app__content--with-sidebar,
            .app__content--collapsed {
                margin-left: 0;
            }

            .app__content {
                padding: 6rem 1rem 2rem 1rem;
            }

            .content-card {
                padding: 1.5rem;
            }
        }