:root {
            /* Light Mode Variables */
            --bg-color: #f4f6f9;
            --text-primary: #1e293b;
            --text-secondary: #64748b;
            --card-bg: #ffffff;
            --accent-color: #2563eb;
            /* Royal Blue */
            --accent-hover: #1d4ed8;
            --border-color: #e2e8f0;
            --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
            --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
            --header-gradient: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
            --badge-bg: #eff6ff;
            --badge-text: #2563eb;
            --footer-border: #cbd5e1;
            --cmd-bg: rgba(255, 255, 255, 0.8);
        }

        [data-theme="dark"] {
            /* Dark Mode Variables (High Contrast) */
            --bg-color: #0f172a;
            /* Deep Navy/Black */
            --text-primary: #f8fafc;
            /* White */
            --text-secondary: #94a3b8;
            /* Light Grey */
            --card-bg: #1e293b;
            /* Dark Slate */
            --accent-color: #38bdf8;
            /* Bright Sky Blue */
            --accent-hover: #60a5fa;
            --border-color: #334155;
            --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
            --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
            --header-gradient: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
            --badge-bg: #0f172a;
            --badge-text: #38bdf8;
            --footer-border: #334155;
            --cmd-bg: rgba(30, 41, 59, 0.8);
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            background-color: var(--bg-color);
            color: var(--text-primary);
            font-family: 'Poppins', sans-serif;
            transition: background-color 0.8s ease, color 0.8s ease;
            min-height: 100vh;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            user-select: none;
            /* Disable text selection */
        }

        /* =========================================
           COMMAND PALETTE
           ========================================= */
        .cmd-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(4px);
            z-index: 10000;
            display: none;
            align-items: flex-start;
            justify-content: center;
            padding-top: 15vh;
            opacity: 0;
            transition: opacity 0.2s ease;
        }

        .cmd-overlay.active {
            display: flex;
            opacity: 1;
        }

        .cmd-modal {
            width: 100%;
            max-width: 600px;
            background: var(--card-bg);
            border-radius: 12px;
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transform: scale(0.95);
            transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
        }

        .cmd-overlay.active .cmd-modal {
            transform: scale(1);
        }

        .cmd-header {
            padding: 16px;
            border-bottom: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .cmd-header i {
            color: var(--text-secondary);
            font-size: 1.2rem;
        }

        #cmd-input {
            flex: 1;
            border: none;
            background: transparent;
            font-size: 1.1rem;
            color: var(--text-primary);
            outline: none;
            font-family: 'Poppins', sans-serif;
        }

        .cmd-esc kbd {
            background: var(--bg-color);
            border: 1px solid var(--border-color);
            padding: 2px 6px;
            border-radius: 4px;
            font-size: 0.75rem;
            color: var(--text-secondary);
        }

        .cmd-body {
            max-height: 400px;
            overflow-y: auto;
            padding: 8px;
        }

        .cmd-item {
            padding: 10px 12px;
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            color: var(--text-primary);
            transition: background 0.1s;
        }

        .cmd-item:hover,
        .cmd-item.selected {
            background: var(--badge-bg);
            color: var(--accent-color);
        }

        .cmd-item-icon {
            margin-right: 12px;
            width: 24px;
            text-align: center;
            color: var(--text-secondary);
        }

        .cmd-item.selected .cmd-item-icon {
            color: var(--accent-color);
        }

        .cmd-item-text {
            flex: 1;
            font-weight: 500;
        }

        .cmd-item-type {
            font-size: 0.75rem;
            color: var(--text-secondary);
            background: var(--bg-color);
            padding: 2px 8px;
            border-radius: 4px;
            border: 1px solid var(--border-color);
        }

        .cmd-footer {
            padding: 8px 16px;
            background: var(--bg-color);
            border-top: 1px solid var(--border-color);
            display: flex;
            justify-content: flex-end;
        }

        .cmd-keys {
            display: flex;
            gap: 12px;
            font-size: 0.75rem;
            color: var(--text-secondary);
        }

        .k-small {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            color: var(--text-primary);
            padding: 2px 5px;
            border-radius: 4px;
            font-family: inherit;
            box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
            font-size: 0.7rem;
            font-weight: 600;
        }

        /* Scrollbar */
        .cmd-body::-webkit-scrollbar {
            width: 6px;
        }

        .cmd-body::-webkit-scrollbar-thumb {
            background: var(--border-color);
            border-radius: 3px;
        }

        /* =========================================
           KEYBOARD HINT BADGE
           ========================================= */
        .kbd-hint {
            position: fixed;
            bottom: 25px;
            left: 20px;
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 10px 16px;
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            box-shadow: var(--shadow-md);
            font-size: 0.85rem;
            color: var(--text-secondary);
            z-index: 999;
            opacity: 1;
            transition: opacity 0.5s ease, transform 0.3s ease, visibility 0.5s ease;
            animation: kbdSlideIn 0.5s ease;
        }

        .kbd-hint.hidden {
            opacity: 0 !important;
            visibility: hidden;
            pointer-events: none;
            transform: translateY(20px);
            animation: none !important;
        }

        .kbd-hint kbd {
            padding: 4px 8px;
            background: var(--accent-color);
            color: #fff;
            border-radius: 6px;
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.8rem;
            font-weight: 600;
            box-shadow: none;
            border: none;
        }

        @keyframes kbdSlideIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* Back to Top Button */
        #btn-back-to-top {
            position: fixed;
            bottom: 25px;
            right: 25px;
            display: none;
            z-index: 100;
            border-radius: 50%;
            width: 45px;
            height: 45px;
            background: var(--accent-color);
            color: white;
            border: none;
            box-shadow: var(--shadow-md);
            transition: all 0.3s;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
        }

        #btn-back-to-top:hover {
            transform: translateY(-5px);
            background: var(--accent-hover);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
        }

        h1,
        h2,
        h3,
        h5 {
            font-family: 'Playfair Display', serif;
            color: var(--text-primary);
        }

        .main-container {
            max-width: 1100px;
            margin: 0 auto;
            padding: 40px 20px;
            flex: 1;
        }

        /* Hero Section */
        .hero {
            background: linear-gradient(-45deg, #ffffff, #f0f4ff, #e0e7ff, #f8fafc);
            background-size: 400% 400%;
            animation: gradientBG 15s ease infinite, fadeInDown 0.8s ease-out;
            border-radius: 20px;
            padding: 60px 40px;
            text-align: center;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-md);
            margin-bottom: 50px;
            position: relative;
            overflow: hidden;
        }

        [data-theme="dark"] .hero {
            background: linear-gradient(-45deg, #0f172a, #1e293b, #0f172a, #1a237e);
            background-size: 400% 400%;
        }

        @keyframes gradientBG {
            0% {
                background-position: 0% 50%;
            }

            50% {
                background-position: 100% 50%;
            }

            100% {
                background-position: 0% 50%;
            }
        }

        .hero h1 {
            font-weight: 900;
            font-size: 3rem;
            margin-bottom: 15px;
            background: linear-gradient(120deg, var(--accent-color), #8b5cf6);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero p {
            color: var(--text-secondary);
            font-size: 1.2rem;
            max-width: 700px;
            margin: 0 auto 30px;
        }

        .info-badges {
            display: flex;
            gap: 20px;
            justify-content: center;
            flex-wrap: wrap;
            margin-bottom: 15px;
        }

        /* Ensure the last badge row has more space before the buttons */
        .info-badges:last-of-type {
            margin-bottom: 40px;
        }

        .badge-pill {
            background: var(--badge-bg);
            color: var(--badge-text);
            padding: 10px 24px;
            border-radius: 50px;
            font-size: 0.95rem;
            font-weight: 600;
            border: 1px solid var(--border-color);
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
            transition: all 0.2s ease;
        }

        .badge-pill:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.15);
        }

        .hero-buttons .btn {
            border-radius: 50px;
            padding: 12px 30px;
            font-weight: 600;
            margin: 10px;
            box-shadow: var(--shadow-sm);
            transition: transform 0.2s, box-shadow 0.2s;
            border: none;
        }

        .btn-primary-custom {
            background: var(--accent-color);
            color: #fff;
        }

        .btn-primary-custom:hover {
            background: var(--accent-hover);
            transform: translateY(-2px);
            color: #fff;
            box-shadow: 0 10px 20px -5px rgba(37, 99, 235, 0.4);
        }

        /* Section Title */
        .section-title {
            display: flex;
            align-items: center;
            margin-bottom: 30px;
            animation: fadeIn 1s ease-out;
        }

        .section-title h3 {
            font-weight: 700;
            margin-right: 20px;
            white-space: nowrap;
        }

        .section-title::after {
            content: '';
            width: 100%;
            height: 2px;
            background: var(--border-color);
            border-radius: 2px;
        }

        /* Cards */
        .card-custom {
            background: var(--card-bg);
            border-radius: 16px;
            border: 1px solid var(--border-color);
            padding: 30px;
            height: 100%;
            transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.8s ease, border-color 0.8s ease;
            position: relative;
            z-index: 1;
        }

        .card-custom:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
            border-color: var(--accent-color);
        }

        .icon-wrapper {
            width: 60px;
            height: 60px;
            background: var(--badge-bg);
            color: var(--accent-color);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            margin-bottom: 20px;
            transition: transform 0.3s ease;
        }

        .card-custom:hover .icon-wrapper {
            transform: scale(1.1) rotate(5deg);
        }

        .exp-tag {
            font-family: 'Poppins', sans-serif;
            font-size: 0.8rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: var(--accent-color);
            display: block;
            margin-bottom: 8px;
        }

        .card-custom h5 {
            font-weight: 700;
            font-size: 1.4rem;
            margin-bottom: 12px;
        }

        .card-custom p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
            margin-bottom: 25px;
        }

        .launch-link {
            text-decoration: none;
            color: var(--accent-color);
            font-weight: 600;
            font-size: 1rem;
            display: inline-flex;
            align-items: center;
            transition: gap 0.2s;
        }

        .launch-link i {
            font-size: 0.9em;
        }

        .launch-link:hover {
            gap: 8px;
            color: var(--accent-hover);
        }

        /* Footer */
        .footer {
            text-align: center;
            padding: 40px 0;
            border-top: 1px solid var(--footer-border);
            margin-top: 60px;
            color: var(--text-secondary);
        }

        .footer a {
            color: var(--text-primary);
            text-decoration: none;
            font-weight: 700;
            font-family: 'Playfair Display', serif;
            transition: color 0.2s;
        }

        .footer a:hover {
            color: var(--accent-color);
        }

        /* Stats Counter */
        .stats-container {
            display: flex;
            justify-content: center;
            gap: 40px;
            margin-top: 30px;
            flex-wrap: wrap;
        }

        .stat-item {
            text-align: center;
            opacity: 0;
            animation: fadeInDown 0.5s ease forwards;
        }

        .stat-item:nth-child(1) {
            animation-delay: 0.2s;
        }

        .stat-item:nth-child(2) {
            animation-delay: 0.4s;
        }

        .stat-item:nth-child(3) {
            animation-delay: 0.6s;
        }

        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            background: linear-gradient(120deg, var(--accent-color), #8b5cf6);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            display: block;
        }

        .stat-label {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-secondary);
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        /* Scroll Reveal Animations */
        .reveal {
            opacity: 0;
            transform: translateY(30px);
            transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            will-change: opacity, transform;
        }

        .reveal.active {
            opacity: 1;
            transform: translateY(0);
        }

        .reveal-left {
            opacity: 0;
            transform: translateX(-50px);
            transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
        }

        .reveal-right {
            opacity: 0;
            transform: translateX(50px);
            transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
        }

        .reveal-left.active,
        .reveal-right.active {
            opacity: 1;
            transform: translateX(0);
        }

        .reveal-left.active,
        .reveal-right.active {
            opacity: 1;
            transform: translateX(0);
        }

        /* Top Controls (Share, PWA, Theme) */
        .top-controls {
            position: absolute;
            top: 20px;
            right: 20px;
            display: flex;
            gap: 10px;
        }

        .control-btn {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            color: var(--text-primary);
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            font-size: 1rem;
            transition: all 0.3s ease;
            box-shadow: var(--shadow-sm);
        }

        .control-btn:hover {
            transform: scale(1.1);
            background: var(--accent-color);
            color: white;
            border-color: var(--accent-color);
        }

        /* Animations */
        @keyframes fadeInDown {
            from {
                opacity: 0;
                transform: translateY(-20px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @keyframes fadeIn {
            from {
                opacity: 0;
            }

            to {
                opacity: 1;
            }
        }

        .col-md-6 {
            opacity: 0;
            animation: fadeInUp 0.6s ease-out forwards;
        }

        .col-md-6:nth-child(1) {
            animation-delay: 0.2s;
        }

        .col-md-6:nth-child(2) {
            animation-delay: 0.3s;
        }

        .col-md-6:nth-child(3) {
            animation-delay: 0.4s;
        }

        .col-md-6:nth-child(4) {
            animation-delay: 0.5s;
        }

        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }


        /* Clickable Badge Animation */
        .clickable-badge {
            text-decoration: none;
            transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275) !important;
            display: inline-flex;
            align-items: center;
            cursor: pointer;
        }

        .clickable-badge:hover {
            transform: translateY(-3px) scale(1.05);
            box-shadow: 0 5px 15px rgba(37, 99, 235, 0.3);
            background: var(--accent-color) !important;
            color: #fff !important;
            border-color: var(--accent-color) !important;
        }

        /* Tech Badges */
        .badge-tech {
            font-size: 0.75rem;
            font-weight: 500;
            background: var(--bg-color);
            color: var(--text-secondary);
            padding: 4px 10px;
            border-radius: 4px;
            margin-right: 5px;
            border: 1px solid var(--border-color);
            display: inline-block;
            transition: all 0.2s;
        }

        .card-custom:hover .badge-tech,
        .mini-project-showcase:hover .badge-tech {
            background: var(--badge-bg);
            color: var(--badge-text);
            border-color: var(--badge-bg);
        }

        .badge-tech.playable {
            background: #eff6ff !important;
            color: #2563eb !important;
            border: none;
            font-weight: 600;
        }

        [data-theme="dark"] .badge-tech.playable {
            background: #1e3a8a !important;
            /* Darker blue for dark mode */
            color: #60a5fa !important;
        }

        .badge-tech.filled {
            color: #fff !important;
            border: none;
            font-weight: 600;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        }

        /* Override hover effects for filled badges to keep them filled */
        .card-custom:hover .badge-tech.filled,
        .mini-project-showcase:hover .badge-tech.filled {
            background: var(--filled-bg) !important;
            color: #fff !important;
        }

        .badge-tech.filled-green {
            background: #10b981;
            --filled-bg: #10b981;
        }

        .badge-tech.filled-blue {
            background: #0ea5e9;
            --filled-bg: #0ea5e9;
        }

        /* Custom Tooltips for Badges */
        .badge[data-tooltip],
        .badge-tech[data-tooltip] {
            position: relative;
            cursor: help;
        }

        .badge[data-tooltip]::after,
        .badge-tech[data-tooltip]::after {
            content: attr(data-tooltip);
            position: absolute;
            bottom: 100%;
            left: 50%;
            transform: translateX(-50%) translateY(-8px);
            background: rgba(0, 0, 0, 0.9);
            color: white;
            padding: 8px 12px;
            border-radius: 6px;
            font-size: 0.75rem;
            white-space: nowrap;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s,
                transform 0.3s;
            z-index: 1000;
            font-weight: normal;
        }

        .badge[data-tooltip]::before,
        .badge-tech[data-tooltip]::before {
            content: '';
            position: absolute;
            bottom: 100%;
            left: 50%;
            transform: translateX(-50%) translateY(0px);
            border: 6px solid transparent;
            border-top-color: rgba(0, 0, 0, 0.9);
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s, transform 0.3s;
            z-index: 1001;
        }

        .badge[data-tooltip]:hover::after,
        .badge[data-tooltip]:hover::before,
        .badge-tech[data-tooltip]:hover::after,
        .badge-tech[data-tooltip]:hover::before {
            opacity: 1;
            transform: translateX(-50%) translateY(0);
        }

        /* Mini Project Card Styling */
        .mini-project-showcase {
            background: linear-gradient(-45deg, #ffffff, #f0f4ff, #e0e7ff, #f8fafc);
            background-size: 400% 400%;
            animation: gradientBG 15s ease infinite;
            border: 1px solid var(--border-color);
            border-radius: 20px;
            padding: 40px;
            box-shadow: var(--shadow-md);
            text-align: center;
            max-width: 800px;
            margin: 0 auto;
            transition: transform 0.3s ease;
            margin-bottom: 50px;
            position: relative;
            /* Removed overflow hidden */
        }

        [data-theme="dark"] .mini-project-showcase {
            background: linear-gradient(-45deg, #0f172a, #1e293b, #0f172a, #1a237e);
            background-size: 400% 400%;
        }

        .mini-project-showcase:hover {
            transform: translateY(-5px);
            border-color: var(--accent-color);
        }

        .mini-project-showcase h4 {
            color: var(--text-primary);
            font-weight: 700;
            margin-bottom: 15px;
            font-size: 1.5rem;
        }

        .mini-project-showcase p {
            color: var(--text-secondary);
            font-size: 1rem;
            margin-bottom: 25px;
        }

        .btn-outline-custom {
            color: var(--accent-color);
            border: 1px solid var(--accent-color);
            border-radius: 12px;
            padding: 10px 20px;
            font-weight: 600;
            transition: all 0.3s ease;
            background: transparent;
            text-decoration: none;
            display: inline-block;
            text-align: center;
        }

        .btn-outline-custom:hover {
            background: var(--accent-color);
            color: white;
            box-shadow: 0 5px 15px rgba(37, 99, 235, 0.3);
        }

        /* ========================================= */
        /*   CHESS GAME STYLES                       */
        /* ========================================= */
        .chess-container {
            /* Hero-like animated gradient background */
            background: linear-gradient(-45deg, #ffffff, #f0f4ff, #e0e7ff, #f8fafc);
            background-size: 400% 400%;
            animation: gradientBG 15s ease infinite, slideUp 0.8s ease-out;
            border: 1px solid var(--border-color);
            border-radius: 20px;
            padding: 24px;
            box-shadow: var(--shadow-md);
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            position: relative;
            /* Removed overflow: hidden to prevent clipping of celebratory effects */
            z-index: 1;
        }

        [data-theme="dark"] .chess-container {
            background: linear-gradient(-45deg, #0f172a, #1e293b, #0f172a, #1a237e);
            background-size: 400% 400%;
        }

        .chess-container:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
            border-color: var(--accent-color);
        }

        @keyframes slideUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .chess-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 15px;
            padding-bottom: 10px;
            border-bottom: 1px solid var(--border-color);
        }

        .turn-indicator {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 600;
            color: var(--text-primary);
        }

        .turn-dot {
            width: 14px;
            height: 14px;
            border-radius: 50%;
            border: 2px solid var(--border-color);
            transition: all 0.3s;
        }

        .turn-dot.white {
            background: #f0f0f0;
            box-shadow: 0 0 8px rgba(255, 255, 255, 0.5);
        }

        .turn-dot.black {
            background: #333;
            box-shadow: 0 0 8px rgba(0, 0, 0, 0.5);
        }

        .chess-controls {
            display: flex;
            gap: 8px;
        }

        .chess-btn {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            color: var(--text-primary);
            width: 36px;
            height: 36px;
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.2s;
        }

        .chess-btn:hover {
            background: var(--accent-color);
            color: white;
            border-color: var(--accent-color);
        }

        /* Game Mode Selector - Apple Segmented Control Style */
        .game-mode-selector {
            display: flex;
            background-color: rgba(118, 118, 128, 0.12);
            padding: 3px;
            border-radius: 99px;
            width: fit-content;
            margin: 0 auto 20px auto;
            position: relative;
        }

        [data-theme="dark"] .game-mode-selector {
            background-color: rgba(118, 118, 128, 0.24);
        }

        .mode-btn {
            background: transparent;
            border: none;
            color: var(--text-primary);
            padding: 6px 20px;
            border-radius: 99px;
            font-weight: 500;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            display: flex;
            align-items: center;
            gap: 6px;
            opacity: 0.8;
            margin: 0;
            min-width: 120px;
            justify-content: center;
        }

        .mode-btn:hover {
            color: var(--accent-color);
            transform: translateY(-2px);
            opacity: 1;
        }

        .mode-btn.active {
            background: var(--accent-color);
            color: white;
            font-weight: 600;
            box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
            opacity: 1;
            transform: none;
        }

        [data-theme="dark"] .mode-btn.active {
            background: var(--accent-color);
            color: white;
            box-shadow: 0 4px 15px rgba(37, 99, 235, 0.4);
        }

        /* Color Selector for AI Mode */
        .color-selector {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 12px;
            padding: 12px 16px;
            background: rgba(37, 99, 235, 0.1);
            border-radius: 12px;
            border: 1px dashed var(--accent-color);
        }

        .color-label {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-primary);
        }

        .color-btn {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 8px 16px;
            border-radius: 8px;
            border: 2px solid var(--border-color);
            background: var(--card-bg);
            color: var(--text-primary);
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s ease;
        }

        .color-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
        }

        .color-btn.white-btn:hover {
            background: #f5f5f5;
            border-color: #ccc;
        }

        .color-btn.black-btn:hover {
            background: #333;
            color: white;
            border-color: #333;
        }

        .color-icon {
            font-size: 1.2rem;
        }

        /* HMI Features Badge Styling */
        .hmi-features {
            text-align: center;
            padding: 12px 20px;
            background: linear-gradient(135deg, rgba(37, 99, 235, 0.08), rgba(147, 51, 234, 0.08));
            border-radius: 12px;
            border: 1px solid rgba(37, 99, 235, 0.15);
        }

        .hmi-features small {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
            font-size: 0.85rem;
            color: var(--text-secondary);
        }

        .hmi-features small i {
            color: var(--accent-color);
        }

        /* Chess Share Modal */
        .chess-share-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.7);
            backdrop-filter: blur(8px);
            display: none;
            justify-content: center;
            align-items: center;
            z-index: 9999;
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .chess-share-overlay.active {
            display: flex;
            opacity: 1;
        }

        /* Reuse existing variable for consistency */
        .chess-share-modal {
            background: var(--card-bg);
            border-radius: 16px;
            max-width: 90vw;
            width: 400px;
            max-height: 90vh;
            overflow-y: auto;
            box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
            border: 1px solid var(--border-color);
            animation: shareModalSlide 0.3s ease;
        }

        .chess-share-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 16px 24px;
            background: transparent;
            border-bottom: 1px solid var(--border-color);
            color: var(--text-primary);
        }

        .chess-share-header h5 {
            margin: 0;
            font-size: 1.1rem;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .chess-share-header h5 i {
            color: var(--accent-color);
        }

        .chess-share-close {
            background: rgba(128, 128, 128, 0.1);
            border: none;
            color: var(--text-primary);
            width: 32px;
            height: 32px;
            border-radius: 50%;
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.2s;
        }

        .chess-share-close:hover {
            background: rgba(255, 0, 0, 0.1);
            color: #ef4444;
            transform: rotate(90deg);
        }

        .chess-share-body {
            padding: 24px;
        }

        .chess-share-preview {
            background: var(--bg-primary);
            border-radius: 12px;
            padding: 20px;
            min-height: 220px;
            display: flex;
            justify-content: center;
            align-items: center;
            margin-bottom: 20px;
            border: 2px dashed var(--border-color);
            transition: border-color 0.3s;
        }

        .chess-share-preview:hover {
            border-color: var(--accent-color);
        }

        .chess-share-preview img {
            max-width: 100%;
            max-height: 40vh;
            width: auto;
            border-radius: 8px;
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
            transform: scale(0.98);
            transition: transform 0.3s;
        }

        .chess-share-preview:hover img {
            transform: scale(1);
        }

        .chess-share-author {
            text-align: center;
            padding: 10px;
            font-size: 0.85rem;
            color: var(--text-secondary);
            border-top: 1px solid var(--border-color);
        }

        .chess-share-author a {
            color: var(--text-primary);
            text-decoration: none;
            font-weight: 600;
            transition: color 0.2s;
        }

        .chess-share-author a:hover {
            color: var(--accent-color);
        }

        .chess-share-footer {
            display: flex;
            gap: 12px;
            padding: 20px 24px;
            background: var(--bg-primary);
            border-top: 1px solid var(--border-color);
            flex-wrap: wrap;
            justify-content: center;
        }

        .chess-share-btn {
            flex: 1;
            min-width: 100px;
            padding: 12px;
            border-radius: 10px;
            font-weight: 500;
            font-size: 0.9rem;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            text-align: center;
            gap: 6px;
            transition: all 0.2s ease;
            cursor: pointer;
            border: 1px solid transparent;
        }

        .chess-share-btn i {
            font-size: 1.2rem;
            margin: 0;
        }

        /* Distinct styles for actions */
        .chess-share-btn.download {
            background: rgba(34, 197, 94, 0.1);
            color: #16a34a;
        }

        .chess-share-btn.download:hover {
            background: #22c55e;
            color: white;
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(34, 197, 94, 0.3);
        }

        .chess-share-btn.copy {
            background: var(--card-bg);
            border-color: var(--border-color);
            color: var(--text-secondary);
        }

        .chess-share-btn.copy:hover {
            border-color: var(--accent-color);
            color: var(--accent-color);
            background: rgba(37, 99, 235, 0.05);
            transform: translateY(-2px);
        }

        .chess-share-btn.native {
            background: rgba(37, 99, 235, 0.1);
            color: var(--accent-color);
        }

        .chess-share-btn.native:hover {
            background: var(--accent-color);
            color: white;
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
        }

        .chessboard {
            display: grid;
            grid-template-columns: repeat(8, 1fr);
            grid-template-rows: repeat(8, 1fr);
            gap: 0;
            border: 2px solid var(--accent-color);
            border-radius: 12px;
            /* Removed overflow: hidden to allow piece entry animations and confetti */
            width: 100%;
            max-width: 420px;
            aspect-ratio: 1 / 1;
            margin: 0 auto;
            padding: 2px;
            background: rgba(37, 99, 235, 0.05);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12), 0 0 15px rgba(37, 99, 235, 0.15);
            animation: boardFadeIn 0.6s ease-out;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .chessboard:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.25), 0 0 25px rgba(37, 99, 235, 0.2);
        }

        @keyframes boardFadeIn {
            from {
                opacity: 0;
                transform: scale(0.95);
            }

            to {
                opacity: 1;
                transform: scale(1);
            }
        }

        /* Apple-Style Chess Pieces - Clean & Minimal */
        .chess-square {
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2.4rem;
            font-family: "Apple Color Emoji", "Segoe UI Symbol", "Noto Color Emoji", sans-serif;
            text-shadow: none;
            font-weight: normal;
            line-height: 1;
            -webkit-font-smoothing: antialiased;
            cursor: pointer;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            position: relative;
            user-select: none;
        }

        .chess-square span.piece {
            display: inline-block;
            filter: drop-shadow(1px 2px 2px rgba(0, 0, 0, 0.15));
            transition: transform 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275), filter 0.25s ease;
            will-change: transform;
        }

        .chess-square:hover span.piece {
            transform: scale(1.15) translateY(-4px);
            filter: drop-shadow(2px 6px 8px rgba(0, 0, 0, 0.25));
        }

        .chess-square.selected span.piece {
            transform: scale(1.15);
            filter: drop-shadow(2px 3px 4px rgba(37, 99, 235, 0.4));
        }

        /* LIGHT MODE - Modern Frosted Glass (Apple Vision Pro inspired) */
        .chess-square.light {
            background-color: rgba(255, 255, 255, 0.55);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: #1d1d1f;
        }

        .chess-square.dark {
            background-color: rgba(200, 200, 200, 0.35);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid rgba(255, 255, 255, 0.1);
            color: #1d1d1f;
        }

        /* DARK MODE - Deep Space Glass */
        [data-theme="dark"] .chess-square.light {
            background-color: rgba(255, 255, 255, 0.18);
            border-color: rgba(255, 255, 255, 0.1);
            color: #f5f5f7;
        }

        [data-theme="dark"] .chess-square.dark {
            background-color: rgba(0, 0, 0, 0.28);
            border-color: rgba(255, 255, 255, 0.05);
            color: #f5f5f7;
        }

        .chess-square:hover {
            filter: brightness(1.1);
        }

        .chess-square.selected {
            background: #7fc7ff !important;
            box-shadow: inset 0 0 10px rgba(0, 100, 255, 0.5);
        }

        .chess-square.valid-move::after {
            content: '';
            position: absolute;
            width: 14px;
            height: 14px;
            background-color: rgba(0, 122, 255, 0.4);
            /* Frosted Blue Dot */
            border-radius: 50%;
            transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
            backdrop-filter: blur(2px);
        }

        .chess-square.valid-move:hover::after {
            transform: scale(1.4);
            background-color: rgba(0, 122, 255, 0.7);
        }

        .chess-square.valid-capture {
            background: rgba(255, 100, 100, 0.4) !important;
        }

        .chess-square.last-move {
            background-color: rgba(0, 122, 255, 0.25) !important;
            /* iOS Blue */
            box-shadow: inset 0 0 0 1px rgba(0, 122, 255, 0.4);
            backdrop-filter: brightness(1.1);
        }

        .piece-animate {
            animation: pieceAppear 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
        }

        @keyframes pieceAppear {
            0% {
                transform: scale(0.5) translateY(20px);
                opacity: 0;
            }

            100% {
                transform: scale(1) translateY(0);
                opacity: 1;
            }
        }

        /* AI Thinking Indicator */
        .ai-thinking {
            display: none;
            align-items: center;
            justify-content: center;
            gap: 8px;
            color: var(--accent-color);
            font-weight: 600;
            padding: 10px;
            background: rgba(37, 99, 235, 0.08);
            border-radius: 12px;
            margin-top: 10px;
            backdrop-filter: blur(5px);
        }

        .ai-thinking.active {
            display: flex;
        }

        .ai-thinking i {
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            from {
                transform: rotate(0deg);
            }

            to {
                transform: rotate(360deg);
            }
        }

        .chess-square.check {
            background: rgba(255, 0, 0, 0.4) !important;
            animation: pulse-check 1s infinite;
        }

        @keyframes pulse-check {

            0%,
            100% {
                box-shadow: inset 0 0 10px rgba(255, 0, 0, 0.5);
            }

            50% {
                box-shadow: inset 0 0 20px rgba(255, 0, 0, 0.8);
            }
        }

        .game-status {
            text-align: center;
            margin-top: 15px;
            font-weight: 600;
            color: var(--accent-color);
            min-height: 24px;
        }

        .game-status.checkmate {
            color: #dc2626;
            font-size: 1.1rem;
        }

        .chess-info-panel {
            /* Hero-like animated gradient background */
            background: linear-gradient(-45deg, #ffffff, #f0f4ff, #e0e7ff, #f8fafc);
            background-size: 400% 400%;
            animation: gradientBG 15s ease infinite, slideUp 0.8s ease-out;
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 25px;
            height: 100%;
            box-shadow: var(--shadow-md);
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            position: relative;
            z-index: 1;
        }

        [data-theme="dark"] .chess-info-panel {
            background: linear-gradient(-45deg, #0f172a, #1e293b, #0f172a, #1a237e);
            background-size: 400% 400%;
        }

        .chess-info-panel:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
            border-color: var(--accent-color);
        }

        .chess-info-panel h4 {
            color: var(--text-primary);
            font-weight: 700;
            margin-bottom: 10px;
        }

        .captured-section {
            background: rgba(0, 0, 0, 0.05);
            border-radius: 8px;
            padding: 12px;
        }

        [data-theme="dark"] .captured-section {
            background: rgba(255, 255, 255, 0.05);
        }

        .captured-row {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 8px;
        }

        .captured-row:last-child {
            margin-bottom: 0;
        }

        .captured-label {
            font-size: 0.85rem;
            color: var(--text-secondary);
            min-width: 110px;
        }

        .captured-pieces {
            font-size: 1.2rem;
            display: flex;
            flex-wrap: wrap;
            gap: 2px;
        }

        .move-history-container {
            background: #1e1e1e;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
            border: 1px solid #333;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .move-history-container:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.45);
            border-color: var(--accent-color);
        }

        [data-theme="dark"] .move-history-container {
            background: #0d1117;
            border-color: #30363d;
        }

        .move-history-header {
            background: linear-gradient(180deg, #3d3d3d 0%, #2d2d2d 100%);
            color: #ccc;
            padding: 10px 14px;
            font-size: 0.8rem;
            font-weight: 500;
            display: flex;
            align-items: center;
            gap: 10px;
            border-bottom: 1px solid #1a1a1a;
        }

        .move-history-header::before {
            content: '';
            display: flex;
            gap: 6px;
        }

        .terminal-buttons {
            display: flex;
            gap: 6px;
            margin-right: 8px;
        }

        .terminal-btn {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            display: inline-block;
        }

        .terminal-btn.red {
            background: #ff5f56;
        }

        .terminal-btn.yellow {
            background: #ffbd2e;
        }

        .terminal-btn.green {
            background: #27c93f;
        }

        .move-history {
            height: 200px;
            overflow-y: auto;
            padding: 12px 14px;
            font-family: 'SF Mono', 'Monaco', 'Menlo', 'Courier New', monospace;
            font-size: 0.85rem;
            font-weight: 400;
            line-height: 1.5;
            -webkit-font-smoothing: antialiased;
            color: #ffffff;
            scrollbar-width: thin;
            scrollbar-color: rgba(255, 255, 255, 0.2) transparent;
        }

        /* Apple/macOS Style Scrollbar */
        .move-history::-webkit-scrollbar {
            width: 8px;
        }

        .move-history::-webkit-scrollbar-track {
            background: transparent;
        }

        .move-history::-webkit-scrollbar-thumb {
            background: rgba(255, 255, 255, 0.2);
            border-radius: 10px;
            border: 2px solid transparent;
            background-clip: content-box;
        }

        .move-history::-webkit-scrollbar-thumb:hover {
            background: rgba(255, 255, 255, 0.35);
            background-clip: content-box;
        }

        .move-entry {
            display: grid;
            grid-template-columns: 35px 1fr 1fr;
            gap: 10px;
            padding: 4px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            color: #d1d5db;
        }

        .move-number {
            color: #6e7681;
            font-size: 0.8rem;
            user-select: none;
        }

        .move-entry span:not(.move-number) {
            color: #ffffff;
            /* Explicit high-contrast white for Apple Terminal look */
            font-weight: 500;
        }

        [data-theme="dark"] .move-entry span:not(.move-number) {
            color: #ffffff;
        }

        @media (max-width: 768px) {
            .chess-square {
                font-size: 1.8rem;
            }

            .chessboard {
                max-width: 100%;
            }

            .mode-btn {
                padding: 6px 14px;
                font-size: 0.8rem;
            }
        }

        /* Animated Author Link */
        .author-link {
            color: var(--accent-color);
            font-weight: 500;
            text-decoration: none;
            position: relative;
            transition: all 0.3s ease;
            display: inline-block;
        }

        .author-link::after {
            content: '';
            position: absolute;
            width: 100%;
            height: 2px;
            bottom: -2px;
            left: 0;
            background-color: var(--accent-color);
            transform: scaleX(0);
            transform-origin: bottom right;
            transition: transform 0.3s ease-out;
        }

        .author-link:hover {
            color: var(--primary-color);
            text-shadow: 0 0 8px rgba(37, 99, 235, 0.4);
            transform: translateY(-1px);
        }

        .author-link:hover::after {
            transform: scaleX(1);
            transform-origin: bottom left;
        }

        /* Laptop/MacBook Visuals */
        .laptop-column {
            width: 100%;
            max-width: none;
            margin: 20px auto;
            perspective: 1000px;
            display: flex;
            justify-content: center;
        }

        .laptop-frame {
            position: relative;
            padding-bottom: 25px;
            width: 85%;
            transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
        }

        .laptop-frame:hover {
            transform: scale(1.03);
        }

        .laptop-screen {
            width: 100%;
            aspect-ratio: 16 / 10;
            background: #000;
            border-radius: 12px 12px 0 0;
            border: 6px solid #1e293b;
            border-bottom: none;
            position: relative;
            overflow: hidden;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
        }

        .laptop-screen::before {
            content: '';
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 12px;
            background: #1e293b;
            border-bottom-left-radius: 8px;
            border-bottom-right-radius: 8px;
            z-index: 10;
        }

        .laptop-screen iframe {
            width: 100%;
            height: 100%;
            border: none;
            opacity: 0;
            animation: videoLoad 1.5s ease-out 0.8s forwards;
        }

        @keyframes videoLoad {
            from {
                opacity: 0;
                filter: blur(10px);
                transform: scale(1.02);
            }

            to {
                opacity: 1;
                filter: blur(0);
                transform: scale(1);
            }
        }

        .laptop-base {
            width: 116%;
            height: 14px;
            background: linear-gradient(to bottom, #334155, #1e293b);
            margin-left: -8%;
            border-radius: 2px 2px 12px 12px;
            position: relative;
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
        }

        .laptop-base::after {
            content: '';
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 6px;
            background: rgba(15, 23, 42, 0.4);
            border-radius: 0 0 10px 10px;
        }

        /* 
 * =========================================
 *   SCROLL HINT HOVER EFFECT
 * =========================================
 */
        .scroll-link {
            color: var(--text-secondary) !important;
            text-decoration: none;
            font-size: 0.9rem;
            font-weight: 500;
            display: inline-flex;
            align-items: center;
            gap: 12px;
            transition: all 0.3s ease;
            white-space: nowrap;
        }

        .scroll-link:hover {
            color: var(--accent-color) !important;
            letter-spacing: 0.5px;
        }

        .scroll-link .fa-chevron-down {
            font-size: 0.8rem;
            animation: bounce 2s infinite;
        }

        @keyframes bounce {

            0%,
            100% {
                transform: translateY(0);
            }

            50% {
                transform: translateY(-5px);
            }
        }

        /* 
         * =========================================
         *   SCROLL HINT (AOA STYLE)
         * =========================================
         */
        .scroll-hint-container {
            margin-top: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 20px;
            animation: fadeInDown 1s ease 0.5s both;
        }

        .scroll-line {
            flex: 1;
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--border-color), transparent);
            max-width: 100px;
        }

        .scroll-link {
            color: var(--text-secondary);
            text-decoration: none;
            font-size: 0.9rem;
            font-weight: 500;
            display: inline-flex;
            align-items: center;
            gap: 12px;
            transition: all 0.3s ease;
            white-space: nowrap;
        }

        .scroll-link:hover {
            color: var(--accent-color);
            letter-spacing: 0.5px;
        }

        .scroll-link i {
            font-size: 0.8rem;
            animation: bounce-hint 2s infinite;
        }

        @keyframes bounce-hint {
            0%,
            20%,
            50%,
            80%,
            100% {
                transform: translateY(0);
            }

            40% {
                transform: translateY(-6px);
            }

            60% {
                transform: translateY(-3px);
            }
        }