:root {
            --primary-color: rgba(64, 224, 208, 0.9);
            --background: rgba(25, 25, 35, 0.95);
            --sidebar-bg: rgba(20, 20, 30, 0.9);
            --message-bg: rgba(255, 255, 255, 0.05);
            --text-color: #fff;
            --input-bg: rgba(255, 255, 255, 0.1);
            --border-color: rgba(255, 255, 255, 0.1);
            --shadow-color: rgba(0, 0, 0, 0.3);
            --timestamp-color: rgba(255, 255, 255, 0.7);
        }
        .dark-mode {
            --primary-color: rgba(64, 224, 208, 0.9);
            --background: rgba(25, 25, 35, 0.95);
            --sidebar-bg: rgba(20, 20, 30, 0.9);
            --message-bg: rgba(255, 255, 255, 0.05);
            --text-color: #fff;
            --input-bg: rgba(255, 255, 255, 0.1);
            --border-color: rgba(255, 255, 255, 0.1);
            --shadow-color: rgba(0, 0, 0, 0.3);
            --timestamp-color: rgba(255, 255, 255, 0.7);
        }
        .light-mode {
            --primary-color: #40E0D0;
            --background: rgba(255, 255, 255, 0.95);
            --sidebar-bg: rgba(240, 240, 245, 0.9);
            --message-bg: rgba(0, 0, 0, 0.03);
            --text-color: #333;
            --input-bg: rgba(0, 0, 0, 0.05);
            --border-color: rgba(0, 0, 0, 0.1);
            --shadow-color: rgba(0, 0, 0, 0.1);
            --timestamp-color: rgba(0, 0, 0, 0.6);
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        body {
            color: var(--text-color);
            min-height: 100vh;
            margin: 0;
            display: flex;
            background: var(--background);
            transition: background-color 0.3s ease;
        }
        .app-container {
            display: flex;
            width: 100%;
            height: 100vh;
            position: relative;
        }
        .sidebar {
            width: 280px;
            background: var(--sidebar-bg);
            backdrop-filter: blur(10px);
            border-right: 1px solid var(--border-color);
            height: 100vh;
            overflow-y: auto;
            transition: transform 0.3s ease;
            z-index: 10;
            display: flex;
            flex-direction: column;
        }
        .sidebar-header {
            padding: 20px;
            border-bottom: 1px solid var(--border-color);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .sidebar-title {
            font-size: 1.2rem;
            font-weight: 600;
        }
        .theme-toggle {
            background: none;
            border: none;
            color: var(--text-color);
            font-size: 1.2rem;
            cursor: pointer;
            padding: 5px;
            border-radius: 50%;
            transition: all 0.3s ease;
        }
        .theme-toggle:hover {
            background: var(--input-bg);
        }
        .room-list {
            flex: 1;
            overflow-y: auto;
            padding: 10px 0;
        }
        .room-item {
            padding: 12px 20px;
            cursor: pointer;
            transition: background-color 0.2s ease;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .room-item:hover {
            background: var(--input-bg);
        }
        .room-item.active {
            background: var(--primary-color);
            color: white;
        }
        .room-icon {
            font-size: 0.9rem;
        }
        .join-room-container {
            padding: 20px;
            border-top: 1px solid var(--border-color);
        }
        .join-room-input {
            width: 100%;
            padding: 12px 15px;
            border: none;
            border-radius: 8px;
            background: var(--input-bg);
            color: var(--text-color);
            margin-bottom: 10px;
        }
        .join-room-btn {
            width: 100%;
            padding: 12px;
            border: none;
            border-radius: 8px;
            background: var(--primary-color);
            color: white;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        .join-room-btn:hover {
            opacity: 0.9;
            transform: translateY(-2px);
        }
        .main-content {
            flex: 1;
            display: flex;
            flex-direction: column;
            height: 100vh;
            overflow: hidden;
        }
        .game-header {
            padding: 15px 20px;
            background: var(--sidebar-bg);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-color);
            display: flex;
            justify-content: space-between;
            align-items: center;
            z-index: 5;
        }
        .game-title {
            font-size: 1.2rem;
            font-weight: 600;
        }
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            color: var(--text-color);
            font-size: 1.2rem;
            cursor: pointer;
        }
        .game-container {
            flex: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            background: var(--background);
            backdrop-filter: blur(10px);
            padding: 20px;
        }
        .board-container {
            position: relative;
            margin: 20px 0;
        }
        .board {
            background: #dcb35c;
            position: relative;
            box-shadow: 0 0 10px var(--shadow-color);
        }
        .grid-line {
            position: absolute;
            background: #000;
        }
        .piece {
            position: absolute;
            border-radius: 50%;
            transform: translate(-50%, -50%);
            box-shadow: 0 0 5px rgba(0, 0, 0, 0.5);
        }
        .piece.black {
            background: #000;
        }
        .piece.white {
            background: #fff;
        }
        .piece.last-move::after {
            content: '';
            position: absolute;
            width: 8px;
            height: 8px;
            background: red;
            border-radius: 50%;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
        }
        .players-info {
            display: flex;
            justify-content: space-between;
            width: 100%;
            max-width: 500px;
            margin-bottom: 20px;
        }
        .player {
            display: flex;
            align-items: center;
            padding: 10px 15px;
            border-radius: 8px;
            background: var(--message-bg);
            flex: 1;
            max-width: 48%;
        }
        .player.active {
            border: 2px solid var(--primary-color);
        }
        .player-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            flex-shrink: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            color: white;
            font-size: 1.2rem;
            margin-right: 10px;
        }
        .player-name {
            font-weight: 600;
        }
        .player-role {
            margin-top: 5px;
            font-size: 0.8rem;
            opacity: 0.8;
        }
        .game-status {
            margin-top: 15px;
            font-size: 1.1rem;
            text-align: center;
            min-height: 24px;
        }
        .restart-btn {
            padding: 10px 20px;
            border: none;
            border-radius: 8px;
            background: var(--primary-color);
            color: white;
            cursor: pointer;
            transition: all 0.3s ease;
            margin-top: 15px;
        }
        .restart-btn:hover {
            opacity: 0.9;
            transform: translateY(-2px);
        }
        .role-selection {
            display: flex;
            justify-content: center;
            gap: 15px;
            margin-top: 20px;
        }
        .role-btn {
            padding: 10px 20px;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.3s ease;
            background: var(--input-bg);
            color: var(--text-color);
        }
        .role-btn:hover {
            opacity: 0.9;
        }
        .role-btn.selected {
            background: var(--primary-color);
            color: white;
        }
        .profile-setup {
            background: var(--message-bg);
            padding: 20px;
            border-radius: 12px;
            margin: 20px;
            animation: fadeIn 0.3s ease;
            max-width: 500px;
            margin: 20px auto;
        }
        .profile-title {
            margin-bottom: 15px;
            font-size: 1.1rem;
        }
        .color-picker {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin: 15px 0;
        }
        .color-option {
            width: 30px;
            height: 30px;
            border-radius: 50%;
            cursor: pointer;
            border: 2px solid transparent;
            transition: all 0.2s ease;
        }
        .color-option.selected {
            border-color: var(--text-color);
            transform: scale(1.1);
        }
        .profile-input {
            width: 100%;
            padding: 12px 15px;
            border: none;
            border-radius: 8px;
            background: var(--input-bg);
            color: var(--text-color);
            margin-bottom: 15px;
        }
        .profile-save-btn {
            width: 100%;
            padding: 12px;
            border: none;
            border-radius: 8px;
            background: var(--primary-color);
            color: white;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        .profile-save-btn:hover {
            opacity: 0.9;
        }
        @media (max-width:768px) {
            .sidebar {
                position: fixed;
                left: 0;
                top: 0;
                height: 100vh;
                transform: translateX(-100%);
                box-shadow: 2px 0 10px rgba(0, 0, 0, 0.2);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .mobile-menu-btn {
                display: block;
            }
            .room-item {
                padding: 10px 15px;
            }
        }
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(10px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        ::-webkit-scrollbar {
            width: 8px;
        }
        ::-webkit-scrollbar-track {
            background: transparent;
        }
        ::-webkit-scrollbar-thumb {
            background: var(--primary-color);
            border-radius: 4px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: rgba(64, 224, 208, 0.7);
        }
        .empty-state {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            height: 100%;
            color: var(--timestamp-color);
            text-align: center;
            padding: 20px;
        }
        .empty-icon {
            font-size: 3rem;
            margin-bottom: 15px;
            opacity: 0.5;
        }
        .winner-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.7);
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 100;
        }
        .winner-box {
            background: var(--sidebar-bg);
            padding: 30px;
            border-radius: 10px;
            text-align: center;
            max-width: 80%;
        }
        .winner-text {
            font-size: 1.5rem;
            margin-bottom: 20px;
        }
        .winner-name {
            color: var(--primary-color);
            font-weight: bold;
        }