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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            color: #333;
            background-color: #f8f9fa;
            line-height: 1.6;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.3s ease;
        }

        /* Navigation Styles */
        .eb31-nav-wrapper {
            background: white;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .eb31-nav-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 70px;
        }

        .eb31-logo {
            display: flex;
            align-items: center;
        }

        .eb31-logo img {
            height: 40px;
            width: auto;
        }

        .eb31-nav-menu {
            display: flex;
            gap: 40px;
            list-style: none;
        }

        .eb31-nav-menu a {
            color: #666;
            font-weight: 500;
            font-size: 14px;
            transition: color 0.3s ease;
        }

        .eb31-nav-menu a:hover {
            color: #1890ff;
        }

        .eb31-nav-menu a.eb31-active {
            color: #1890ff;
            border-bottom: 3px solid #1890ff;
            padding-bottom: 5px;
        }

        .eb31-nav-actions {
            display: flex;
            gap: 20px;
            align-items: center;
        }

        .eb31-nav-btn {
            padding: 8px 20px;
            border-radius: 6px;
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.3s ease;
            border: none;
        }

        .eb31-nav-btn-login {
            color: #1890ff;
            background: transparent;
        }

        .eb31-nav-btn-login:hover {
            background: #f0f5ff;
        }

        .eb31-nav-btn-primary {
            background: #1890ff;
            color: white;
        }

        .eb31-nav-btn-primary:hover {
            background: #0050b3;
            transform: translateY(-2px);
        }

        /* Page Header Section */
        .eb31-page-header {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 40px 20px;
            text-align: center;
            margin-bottom: 40px;
        }

        .eb31-page-header-content {
            max-width: 1200px;
            margin: 0 auto;
        }

        .eb31-page-title {
            font-size: 32px;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .eb31-page-subtitle {
            font-size: 16px;
            opacity: 0.9;
        }

        /* Breadcrumb */
        .eb31-breadcrumb {
            max-width: 1200px;
            margin: -30px auto 30px;
            padding: 0 20px;
            font-size: 13px;
        }

        .eb31-breadcrumb a {
            color: #1890ff;
        }

        .eb31-breadcrumb a:hover {
            text-decoration: underline;
        }

        /* User Center Content */
        .eb31-user-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* User Profile Card */
        .eb31-profile-card {
            background: white;
            border-radius: 12px;
            padding: 30px;
            margin-bottom: 40px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
            display: flex;
            align-items: center;
            gap: 30px;
        }

        .eb31-profile-avatar {
            width: 120px;
            height: 120px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 48px;
            flex-shrink: 0;
        }

        .eb31-profile-info h2 {
            font-size: 24px;
            margin-bottom: 8px;
        }

        .eb31-profile-info p {
            color: #999;
            font-size: 14px;
            margin-bottom: 5px;
        }

        .eb31-profile-stats {
            display: flex;
            gap: 40px;
            margin-top: 15px;
            padding-top: 15px;
            border-top: 1px solid #eee;
        }

        .eb31-stat-item {
            display: flex;
            flex-direction: column;
        }

        .eb31-stat-number {
            font-size: 20px;
            font-weight: 700;
            color: #1890ff;
        }

        .eb31-stat-label {
            font-size: 12px;
            color: #999;
            margin-top: 3px;
        }

        /* Tab Navigation */
        .eb31-tabs-wrapper {
            background: white;
            border-radius: 12px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
            margin-bottom: 40px;
            overflow: hidden;
        }

        .eb31-tabs-header {
            display: flex;
            border-bottom: 1px solid #eee;
            padding: 0 30px;
        }

        .eb31-tab-btn {
            padding: 16px 24px;
            border: none;
            background: none;
            cursor: pointer;
            font-size: 14px;
            font-weight: 500;
            color: #666;
            position: relative;
            transition: color 0.3s ease;
        }

        .eb31-tab-btn:hover {
            color: #1890ff;
        }

        .eb31-tab-btn.eb31-tab-active {
            color: #1890ff;
        }

        .eb31-tab-btn.eb31-tab-active::after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 0;
            right: 0;
            height: 3px;
            background: #1890ff;
        }

        .eb31-tabs-content {
            padding: 30px;
        }

        .eb31-tab-pane {
            display: none;
        }

        .eb31-tab-pane.eb31-show {
            display: block;
        }

        /* Settings Grid */
        .eb31-settings-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 20px;
            margin-bottom: 30px;
        }

        .eb31-setting-card {
            background: #f8f9fa;
            border-radius: 8px;
            padding: 20px;
            border: 1px solid #eee;
            transition: all 0.3s ease;
        }

        .eb31-setting-card:hover {
            border-color: #1890ff;
            box-shadow: 0 4px 12px rgba(24, 144, 255, 0.15);
        }

        .eb31-setting-title {
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 8px;
            color: #333;
        }

        .eb31-setting-desc {
            font-size: 12px;
            color: #999;
            margin-bottom: 12px;
        }

        .eb31-setting-control {
            display: flex;
            gap: 10px;
        }

        .eb31-switch {
            width: 50px;
            height: 26px;
            background: #d9d9d9;
            border-radius: 13px;
            position: relative;
            cursor: pointer;
            transition: background 0.3s ease;
        }

        .eb31-switch.eb31-on {
            background: #1890ff;
        }

        .eb31-switch::after {
            content: '';
            position: absolute;
            width: 22px;
            height: 22px;
            background: white;
            border-radius: 50%;
            top: 2px;
            left: 2px;
            transition: left 0.3s ease;
        }

        .eb31-switch.eb31-on::after {
            left: 26px;
        }

        .eb31-btn-small {
            padding: 6px 16px;
            background: white;
            border: 1px solid #d9d9d9;
            border-radius: 4px;
            cursor: pointer;
            font-size: 12px;
            transition: all 0.3s ease;
        }

        .eb31-btn-small:hover {
            border-color: #1890ff;
            color: #1890ff;
        }

        /* Device List */
        .eb31-device-list {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .eb31-device-item {
            background: #f8f9fa;
            border-radius: 8px;
            padding: 15px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            border: 1px solid #eee;
        }

        .eb31-device-info {
            flex: 1;
        }

        .eb31-device-name {
            font-weight: 600;
            margin-bottom: 4px;
        }

        .eb31-device-meta {
            font-size: 12px;
            color: #999;
        }

        .eb31-device-status {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 12px;
        }

        .eb31-status-dot {
            width: 8px;
            height: 8px;
            background: #52c41a;
            border-radius: 50%;
        }

        /* Skin Gallery */
        .eb31-skin-gallery {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
            gap: 15px;
        }

        .eb31-skin-item {
            background: white;
            border-radius: 8px;
            overflow: hidden;
            cursor: pointer;
            transition: all 0.3s ease;
            border: 2px solid transparent;
        }

        .eb31-skin-item:hover {
            border-color: #1890ff;
            transform: translateY(-4px);
            box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
        }

        .eb31-skin-preview {
            width: 100%;
            height: 100px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            position: relative;
            overflow: hidden;
        }

        .eb31-skin-preview.eb31-skin-2 {
            background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
        }

        .eb31-skin-preview.eb31-skin-3 {
            background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
        }

        .eb31-skin-preview.eb31-skin-4 {
            background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
        }

        .eb31-skin-preview.eb31-skin-5 {
            background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
        }

        .eb31-skin-info {
            padding: 10px;
            background: white;
        }

        .eb31-skin-name {
            font-size: 12px;
            font-weight: 600;
            margin-bottom: 4px;
        }

        .eb31-skin-action {
            font-size: 11px;
            color: #1890ff;
        }

        /* Vocabulary Section */
        .eb31-vocab-control {
            background: #f8f9fa;
            border-radius: 8px;
            padding: 20px;
            margin-bottom: 20px;
            display: flex;
            gap: 10px;
            align-items: center;
            flex-wrap: wrap;
        }

        .eb31-input-group {
            flex: 1;
            min-width: 200px;
            display: flex;
            gap: 8px;
        }

        .eb31-input-field {
            flex: 1;
            padding: 10px 12px;
            border: 1px solid #d9d9d9;
            border-radius: 4px;
            font-size: 13px;
            transition: border-color 0.3s ease;
        }

        .eb31-input-field:focus {
            outline: none;
            border-color: #1890ff;
            box-shadow: 0 0 0 2px rgba(24, 144, 255, 0.2);
        }

        .eb31-btn-primary {
            padding: 10px 24px;
            background: #1890ff;
            color: white;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-weight: 500;
            transition: all 0.3s ease;
        }

        .eb31-btn-primary:hover {
            background: #0050b3;
            transform: translateY(-2px);
        }

        .eb31-vocab-list {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .eb31-vocab-row {
            background: white;
            border-radius: 6px;
            padding: 12px 15px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            border: 1px solid #eee;
        }

        .eb31-vocab-text {
            flex: 1;
        }

        .eb31-vocab-word {
            font-weight: 600;
            margin-bottom: 3px;
        }

        .eb31-vocab-type {
            font-size: 12px;
            color: #999;
        }

        .eb31-vocab-actions {
            display: flex;
            gap: 8px;
        }

        .eb31-btn-delete {
            padding: 4px 12px;
            background: #ff4d4f;
            color: white;
            border: none;
            border-radius: 3px;
            cursor: pointer;
            font-size: 11px;
            transition: all 0.3s ease;
        }

        .eb31-btn-delete:hover {
            background: #ff7875;
        }

        /* Account Security */
        .eb31-security-section {
            background: #f8f9fa;
            border-radius: 8px;
            padding: 20px;
            margin-bottom: 20px;
        }

        .eb31-security-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
            border-bottom: 1px solid #eee;
        }

        .eb31-security-item:last-child {
            border-bottom: none;
        }

        .eb31-security-label {
            font-weight: 600;
            margin-bottom: 4px;
        }

        .eb31-security-desc {
            font-size: 12px;
            color: #999;
        }

        .eb31-btn-secondary {
            padding: 8px 20px;
            background: white;
            border: 1px solid #d9d9d9;
            border-radius: 4px;
            cursor: pointer;
            font-weight: 500;
            transition: all 0.3s ease;
        }

        .eb31-btn-secondary:hover {
            border-color: #1890ff;
            color: #1890ff;
        }

        /* Statistics Dashboard */
        .eb31-stats-dashboard {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin-bottom: 30px;
        }

        .eb31-stat-box {
            background: white;
            border-radius: 8px;
            padding: 20px;
            border: 1px solid #eee;
            text-align: center;
        }

        .eb31-stat-box-icon {
            font-size: 32px;
            margin-bottom: 10px;
        }

        .eb31-stat-box-value {
            font-size: 28px;
            font-weight: 700;
            color: #1890ff;
            margin-bottom: 5px;
        }

        .eb31-stat-box-label {
            font-size: 13px;
            color: #999;
        }

        /* Notification Settings */
        .eb31-notification-list {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .eb31-notification-item {
            background: white;
            border-radius: 6px;
            padding: 15px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            border: 1px solid #eee;
        }

        .eb31-notification-text h4 {
            font-size: 14px;
            margin-bottom: 4px;
        }

        .eb31-notification-text p {
            font-size: 12px;
            color: #999;
        }

        /* Footer */
        .eb31-footer {
            background: #1f1f1f;
            color: #999;
            padding: 50px 20px 20px;
            margin-top: 60px;
        }

        .eb31-footer-container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .eb31-footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 30px;
            margin-bottom: 30px;
            padding-bottom: 30px;
            border-bottom: 1px solid #333;
        }

        .eb31-footer-section h4 {
            color: white;
            margin-bottom: 15px;
            font-size: 14px;
            font-weight: 600;
        }

        .eb31-footer-section ul {
            list-style: none;
        }

        .eb31-footer-section li {
            margin-bottom: 10px;
        }

        .eb31-footer-section a {
            color: #999;
            font-size: 13px;
            transition: color 0.3s ease;
        }

        .eb31-footer-section a:hover {
            color: #1890ff;
        }

        .eb31-footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
            font-size: 12px;
        }

        .eb31-footer-brand {
            color: white;
            font-weight: 600;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .eb31-nav-menu {
                gap: 20px;
            }

            .eb31-profile-card {
                flex-direction: column;
                text-align: center;
            }

            .eb31-profile-stats {
                flex-wrap: wrap;
                gap: 20px;
            }

            .eb31-page-title {
                font-size: 24px;
            }

            .eb31-settings-grid {
                grid-template-columns: 1fr;
            }

            .eb31-skin-gallery {
                grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
            }

            .eb31-tabs-header {
                padding: 0 15px;
                overflow-x: auto;
            }

            .eb31-tab-btn {
                padding: 12px 16px;
                white-space: nowrap;
            }

            .eb31-footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
        }

        @media (max-width: 480px) {
            .eb31-nav-container {
                height: auto;
                padding: 15px 20px;
                flex-wrap: wrap;
                gap: 15px;
            }

            .eb31-nav-menu {
                display: none;
            }

            .eb31-page-title {
                font-size: 20px;
            }

            .eb31-tabs-content {
                padding: 15px;
            }

            .eb31-vocab-control {
                flex-direction: column;
            }

            .eb31-input-group {
                width: 100%;
            }

            .eb31-device-item {
                flex-direction: column;
                align-items: flex-start;
                gap: 10px;
            }
        }