/* Terminal Floating Nav (Desktop) */
        .terminal-floating-nav {
            position: fixed;
            right: 20px;
            top: 50%;
            transform: translateY(-50%);
            z-index: 1000;
            background: rgba(13, 17, 23, 0.95);
            border: 1px solid #333;
            border-radius: 4px;
            padding: 1rem;
            max-width: 250px;
            font-family: 'Fira Code', monospace;
            font-size: 0.85rem;
            display: none;
            box-shadow: -5px 5px 15px rgba(0, 0, 0, 0.5);
        }

        @media (min-width: 1400px) {
            .terminal-floating-nav {
                display: block;
            }
        }

        .terminal-nav-header {
            color: var(--bs-success);
            /* Terminal Green */
            border-bottom: 1px solid #333;
            padding-bottom: 0.5rem;
            margin-bottom: 0.5rem;
            font-weight: bold;
        }

        .terminal-tree {
            list-style: none;
            padding-left: 0;
            margin: 0;
        }

        .terminal-tree-item {
            margin-bottom: 0.25rem;
        }

        .terminal-tree-link {
            color: #888;
            text-decoration: none;
            display: block;
            padding: 2px 0;
            transition: color 0.2s;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .terminal-tree-link:hover,
        .terminal-tree-link.active {
            color: var(--bs-success);
            text-shadow: 0 0 5px rgba(40, 167, 69, 0.5);
        }

        .terminal-tree-link.active::before {
            content: '> ';
            color: var(--bs-warning);
        }

        .terminal-sub-tree {
            list-style: none;
            padding-left: 1.2rem;
            border-left: 1px solid #333;
            margin-left: 0.5rem;
            display: none;
            /* Auto-collapse */
        }

        .terminal-sub-tree.expanded {
            display: block;
        }

        /* Reading Progress */
        .terminal-progress-bar {
            position: fixed;
            top: 0;
            left: 0;
            height: 3px;
            background: var(--bs-success);
            z-index: 9999;
            width: 0%;
            box-shadow: 0 0 10px var(--bs-success);
        }

        /* Back to Top (Terminal Style) */
        .terminal-back-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 40px;
            height: 40px;
            background: #000;
            border: 1px solid var(--bs-success);
            color: var(--bs-success);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
        }

        .terminal-back-top:hover {
            background: var(--bs-success);
            color: #000;
        }

        .terminal-back-top.visible {
            opacity: 1;
            visibility: visible;
        }

        /* Mobile Nav (Bottom) */
        .terminal-mobile-nav {
            position: fixed;
            bottom: 0;
            left: 0;
            width: 100%;
            background: rgba(13, 17, 23, 0.98);
            border-top: 1px solid #333;
            padding: 0.5rem;
            z-index: 1000;
            display: flex;
            overflow-x: auto;
            white-space: nowrap;
            gap: 10px;
            box-shadow: 0 -5px 15px rgba(0, 0, 0, 0.5);
        }

        @media (min-width: 1400px) {
            .terminal-mobile-nav {
                display: none;
            }
        }

        .terminal-mobile-link {
            color: #888;
            border: 1px solid #444;
            padding: 5px 10px;
            border-radius: 4px;
            text-decoration: none;
            font-family: 'Fira Code', monospace;
            font-size: 0.8rem;
        }

        .terminal-mobile-link.active {
            border-color: var(--bs-success);
            color: var(--bs-success);
            background: rgba(40, 167, 69, 0.1);
        }

        /* Filter Tab Bar */
        .tutorial-filter-bar {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            justify-content: center;
            margin-bottom: 2rem;
            padding: 1rem;
            background: rgba(13, 17, 23, 0.8);
            border: 1px solid #333;
            border-radius: 8px;
        }

        .tutorial-filter-bar .filter-btn {
            background: transparent;
            border: 1px solid #555;
            color: #888;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            cursor: pointer;
            font-family: 'Fira Code', monospace;
            font-size: 0.85rem;
            transition: all 0.3s;
        }

        .tutorial-filter-bar .filter-btn:hover {
            border-color: var(--bs-success);
            color: var(--bs-success);
        }

        .tutorial-filter-bar .filter-btn.active {
            background: var(--bs-success);
            border-color: var(--bs-success);
            color: #000;
        }

        /* Accordion Styles */
        .tutorial-accordion {
            margin-bottom: 1.5rem;
            border: 1px solid #333;
            border-radius: 8px;
            overflow: hidden;
        }

        .tutorial-accordion-header {
            width: 100%;
            border: 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 1.5rem;
            background: rgba(13, 17, 23, 0.9);
            color: inherit;
            text-align: left;
            cursor: pointer;
            transition: background 0.3s;
        }

        .tutorial-accordion-header:hover,
        .tutorial-accordion-header:focus-visible {
            background: rgba(40, 167, 69, 0.1);
        }

        .tutorial-accordion-header:focus-visible {
            outline: 2px solid var(--bs-success);
            outline-offset: -2px;
        }

        .tutorial-accordion-header .accordion-title {
            flex: 1;
        }

        .tutorial-accordion-header .accordion-title h2 {
            font-size: 1.25rem;
            margin: 0;
            color: var(--bs-success);
        }

        .tutorial-accordion-header .accordion-title p {
            margin: 0.25rem 0 0 0;
            font-size: 0.85rem;
            color: #888;
        }

        .tutorial-accordion-header .accordion-icon {
            font-size: 1.2rem;
            color: var(--bs-success);
            transition: transform 0.3s;
        }

        .tutorial-accordion.collapsed .accordion-icon {
            transform: rotate(-90deg);
        }

        .tutorial-accordion-body {
            max-height: 5000px;
            overflow: hidden;
            transition: max-height 0.5s ease-in-out, padding 0.3s;
            padding: 1.5rem;
            background: rgba(0, 0, 0, 0.2);
        }

        .tutorial-accordion.collapsed .tutorial-accordion-body {
            max-height: 0;
            padding: 0 1.5rem;
        }

        .tutorial-accordion.hidden {
            display: none;
        }