:root {
            --primary: #6c63ff;
            --secondary: #ff6b9d;
            --accent: #4ecdc4;
            --light: #f8f9fa;
            --dark: #343a40;
            --glass-bg: rgba(255, 255, 255, 0.25);
            --glass-border: rgba(255, 255, 255, 0.18);
            --shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            background: url('/assets/img/bg.png') no-repeat center center fixed;
            background-size: cover;
            min-height: 100vh;
            padding: 20px;
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
        }

        header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px;
            margin-bottom: 30px;
            background: var(--glass-bg);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border-radius: 20px;
            border: 1px solid var(--glass-border);
            box-shadow: var(--shadow);
            width: 100%;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .logo i {
            font-size: 2.5rem;
            color: var(--primary);
        }

        .logo h1 {
            font-size: 2rem;
            background: linear-gradient(45deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            font-weight: 700;
        }

        .user-controls {
            display: flex;
            gap: 15px;
            align-items: center;
        }

        .btn {
            padding: 10px 20px;
            border: none;
            border-radius: 50px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .btn-primary {
            background: var(--primary);
            color: white;
        }

        .btn-secondary {
            background: var(--secondary);
            color: white;
        }

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

        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
        }

        .board-selector {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 20px;
        }

        .board-selector select {
            padding: 10px 15px;
            border-radius: 50px;
            border: none;
            background: var(--glass-bg);
            backdrop-filter: blur(5px);
            color: var(--dark);
            font-weight: 500;
            cursor: pointer;
            outline: none;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }

        .main-content {
            display: grid;
            grid-template-columns: 1fr 2fr;
            gap: 30px;
        }

        @media (max-width: 768px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }

        .user-panel,
        .messages-panel {
            background: var(--glass-bg);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border-radius: 20px;
            border: 1px solid var(--glass-border);
            box-shadow: var(--shadow);
            padding: 25px;
        }

        .user-panel {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .user-info {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 15px;
            padding-bottom: 20px;
            border-bottom: 1px solid var(--glass-border);
        }

        .avatar {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2rem;
            font-weight: bold;
            color: white;
            background: linear-gradient(45deg, var(--primary), var(--secondary));
            overflow: hidden;
        }

        .avatar img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .form-group {
            display: flex;
            flex-direction: column;
            gap: 8px;
            width: 100%;
        }

        .form-group label {
            font-weight: 600;
            color: var(--dark);
        }

        .form-group input,
        .form-group textarea {
            padding: 12px 15px;
            border-radius: 12px;
            border: 1px solid var(--glass-border);
            background: rgba(255, 255, 255, 0.7);
            font-size: 1rem;
            transition: all 0.3s ease;
        }

        .form-group input:focus,
        .form-group textarea:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 2px rgba(108, 99, 255, 0.2);
        }

        .messages-panel {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .message {
            background: rgba(255, 255, 255, 0.7);
            border-radius: 15px;
            padding: 20px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
        }

        .message:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
        }

        .message-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 12px;
        }

        .message-user {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .message-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            color: white;
            background: linear-gradient(45deg, var(--primary), var(--secondary));
            font-size: 1.2rem;
            overflow: hidden;
        }

        .message-avatar img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .message-content {
            line-height: 1.6;
            color: var(--dark);
        }

        .message-time {
            font-size: 0.85rem;
            color: #6c757d;
        }

        .message-actions {
            display: flex;
            gap: 10px;
            margin-top: 15px;
        }

        .message-actions button {
            background: none;
            border: none;
            color: #6c757d;
            cursor: pointer;
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            gap: 5px;
            transition: color 0.3s ease;
        }

        .message-actions button:hover {
            color: var(--secondary);
        }

        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            backdrop-filter: blur(5px);
            z-index: 1000;
            justify-content: center;
            align-items: center;
        }

        .modal-content {
            background: var(--glass-bg);
            backdrop-filter: blur(15px);
            border-radius: 20px;
            padding: 30px;
            width: 90%;
            max-width: 500px;
            box-shadow: var(--shadow);
            border: 1px solid var(--glass-border);
        }

        .modal-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
        }

        .modal-title {
            font-size: 1.5rem;
            font-weight: 700;
            background: linear-gradient(45deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }

        .close-modal {
            background: none;
            border: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--dark);
        }

        .admin-controls {
            display: none;
            margin-top: 20px;
            padding-top: 20px;
            border-top: 1px solid var(--glass-border);
        }

        .admin-badge {
            background: var(--secondary);
            color: white;
            padding: 5px 10px;
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-left: 10px;
        }

        .loading {
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
        }

        .spinner {
            width: 40px;
            height: 40px;
            border: 4px solid rgba(255, 255, 255, 0.3);
            border-radius: 50%;
            border-top-color: var(--primary);
            animation: spin 1s ease-in-out infinite;
        }

        @keyframes spin {
            to {
                transform: rotate(360deg);
            }
        }

        .empty-state {
            text-align: center;
            padding: 40px 20px;
            color: #6c757d;
        }

        .empty-state i {
            font-size: 3rem;
            margin-bottom: 15px;
            color: var(--accent);
        }

        .toast {
            position: fixed;
            bottom: 20px;
            right: 20px;
            padding: 15px 25px;
            background: var(--dark);
            color: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
            display: flex;
            align-items: center;
            gap: 10px;
            transform: translateY(100px);
            opacity: 0;
            transition: all 0.3s ease;
            z-index: 1001;
        }

        .toast.show {
            transform: translateY(0);
            opacity: 1;
        }

        .toast.success {
            background: var(--accent);
        }

        .toast.error {
            background: var(--secondary);
        }

        /* 新增的 CSS 样式 */
        .board-controls {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
            gap: 20px;
            flex-wrap: wrap;
        }

        .search-box {
            display: flex;
            gap: 10px;
            flex-grow: 1;
            max-width: 400px;
        }

        .search-box input {
            flex-grow: 1;
            padding: 10px 15px;
            border-radius: 50px;
            border: none;
            background: var(--glass-bg);
            backdrop-filter: blur(5px);
            color: var(--dark);
            font-weight: 500;
            outline: none;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }

        .search-box input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 2px rgba(108, 99, 255, 0.2);
        }

        .board-selector {
            display: flex;
            align-items: center;
            gap: 10px;
            white-space: nowrap;
        }

        .board-selector select {
            min-width: 200px;
            padding: 10px 15px;
            border-radius: 50px;
            border: none;
            background: var(--glass-bg);
            backdrop-filter: blur(5px);
            color: var(--dark);
            font-weight: 500;
            cursor: pointer;
            outline: none;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }

        .board-selector select option {
            padding: 10px;
            background: white;
            color: var(--dark);
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .board-controls {
                flex-direction: column;
                align-items: stretch;
            }

            .search-box {
                max-width: 100%;
            }

            .board-selector {
                width: 100%;
            }

            .board-selector select {
                flex-grow: 1;
            }
        }

        /* 登录按钮状态 */
        #adminLogoutBtn {
            margin-left: 10px;
        }