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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 顶部菜单栏 */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #2c3e50;
    color: white;
    padding: 10px 20px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    z-index: 100;
    flex-wrap: wrap;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 15px;
    flex: 1;
    min-width: 200px;
}

.navbar-brand h1 {
    color: white;
    font-size: 1.8rem;
    margin: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.navbar-logo {
    height: 40px;
    width: auto;
    object-fit: contain;
    border-radius: 4px;
    padding: 2px;
}

.navbar-right {
    display: flex;
    gap: 10px;
    align-items: center;
    margin-top: 5px;
    margin-bottom: 5px;
}

.navbar-right button {
    background-color: transparent;
    color: white;
    border: 1px solid white;
    padding: 8px 15px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 5px;
}

.navbar-right button:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.settings-icon, .login-icon, .logout-icon {
    font-size: 16px;
}

/* 响应式设计 - 移动设备优化 */
@media (max-width: 768px) {
    .navbar {
        padding: 10px 15px;
        flex-direction: column;
        align-items: flex-start;
    }
    
    .navbar-brand {
        width: 100%;
        justify-content: space-between;
    }
    
    .navbar-brand h1 {
        font-size: 1.4rem;
    }
    
    .navbar-right {
        width: 100%;
        justify-content: flex-end;
        margin-top: 10px;
    }
    
    .navbar-right button {
        padding: 6px 10px;
        font-size: 12px;
    }
    
    /* 在小屏幕上只显示图标，不显示文字 */
    @media (max-width: 480px) {
        .navbar-right button span {
            display: none;
        }
        
        .navbar-right button {
            padding: 6px 8px;
        }
        
        .navbar-brand h1 {
            font-size: 1.2rem;
        }
        
        .navbar-logo {
            height: 35px;
        }
    }
}

/* 主内容区 */
.main-container {
    display: flex;
    flex: 1;
    max-width: 100%;
    margin: 0;
    padding: 0;
}

/* 左侧导航栏 */
.sidebar {
    width: 200px;
    background-color: #34495e;
    color: white;
    padding: 20px 0;
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.1);
}

.nav-menu {
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav-item {
    padding: 15px 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-left-color: #3498db;
}

.nav-item.active {
    background-color: rgba(52, 152, 219, 0.2);
    border-left-color: #3498db;
    font-weight: 600;
}

.nav-icon {
    font-size: 18px;
}

/* 右侧内容区 */
.content {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
}

header p {
    color: #7f8c8d;
    font-size: 1.1rem;
}

section {
    background-color: #ffffff;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin-bottom: 30px;
    padding: 25px;
}

section h2 {
    color: #2c3e50;
    margin-bottom: 20px;
    font-size: 1.8rem;
    border-bottom: 2px solid #3498db;
    padding-bottom: 10px;
}

/* Configuration Section */
.config-form {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    align-items: center;
}

.form-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.form-group label {
    font-weight: 600;
    color: #555;
}

.form-group input {
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
    min-width: 150px;
}

button {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #2980b9;
}

/* Real-time Data Section */
.data-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.data-card {
    background-color: #f8f9fa;
    border: 2px solid #e9ecef;
    border-radius: 12px;
    padding: 25px;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

/* Device disconnected state */
.data-card.disconnected {
    background-color: #ffebee;
    border-color: #c62828;
    color: #c62828;
    transition: all 0.3s ease;
}

/* 确保各种数据卡片类型的disconnected状态都能显示红色 */
.data-card.outdoorTemp.disconnected,
.data-card.outdoorHumidity.disconnected,
.data-card.windSpeed.disconnected,
.data-card.lightIntensity.disconnected,
.data-card.feelTemp.disconnected {
    background-color: #ffebee;
    border-color: #c62828;
    color: #c62828;
}

/* 图表日期选择器样式 */
.chart-date-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 20px;
    align-items: center;
    padding: 15px;
    background-color: #f8f9fa;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.chart-date-controls .date-inputs {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.chart-date-controls .date-input-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.chart-date-controls .date-input-group label {
    font-weight: 600;
    color: #555;
    font-size: 14px;
}

.chart-date-controls .date-input-group input {
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
}

.chart-date-controls .refresh-btn {
    align-self: flex-end;
    margin-top: 10px;
}

/* 实时曲线图表样式 */
.realtime-chart-container {
    margin-top: 30px;
    padding: 20px;
    background-color: #ffffff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.realtime-chart-container h3 {
    margin-top: 0;
    margin-bottom: 15px;
    color: #2c3e50;
    font-size: 18px;
    font-weight: 600;
}

#realtimeChart {
    max-height: 300px;
    width: 100%;
}

.data-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #3498db, #2980b9);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.data-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    border-color: #3498db;
}

.data-card:hover::before {
    transform: scaleX(1);
}

.data-card h3 {
    color: #6c757d;
    font-size: 1rem;
    margin-bottom: 15px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.data-value {
    font-size: 2.8rem;
    font-weight: bold;
    color: #2c3e50;
    margin-bottom: 5px;
    transition: all 0.3s ease;
}

.data-value.updating {
    animation: dataUpdate 0.5s ease;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.02); }
    100% { transform: scale(1); }
}

@keyframes dataUpdate {
    0% { opacity: 0.5; transform: scale(0.95); }
    50% { opacity: 1; transform: scale(1.05); }
    100% { opacity: 1; transform: scale(1); }
}

.data-unit {
    color: #7f8c8d;
    font-size: 1rem;
    font-weight: 500;
}

/* Color-coded data cards with light backgrounds */
.data-card.outdoorTemp {
    background-color: #f0f9ff; /* 淡蓝色 */
    border-color: #bae6fd;
}

.data-card.outdoorTemp::before {
    background: linear-gradient(90deg, #0ea5e9, #0284c7);
}

.data-card.outdoorTemp .data-value {
    color: #2c3e50;
}

.data-card.outdoorHumidity {
    background-color: #f0fdf4; /* 淡绿色 */
    border-color: #bbf7d0;
}

.data-card.outdoorHumidity::before {
    background: linear-gradient(90deg, #10b981, #059669);
}

.data-card.outdoorHumidity .data-value {
    color: #2c3e50;
}

.data-card.windSpeed {
    background-color: #eff6ff; /* 淡深蓝色 */
    border-color: #bfdbfe;
}

.data-card.windSpeed::before {
    background: linear-gradient(90deg, #3b82f6, #2563eb);
}

.data-card.windSpeed .data-value {
    color: #2c3e50;
}

.data-card.lightIntensity {
    background-color: #fffbeb; /* 淡黄色 */
    border-color: #fef3c7;
}

.data-card.lightIntensity::before {
    background: linear-gradient(90deg, #f59e0b, #d97706);
}

.data-card.lightIntensity .data-value {
    color: #2c3e50;
}

.data-card.feelTemp {
    background-color: #fef2f2; /* 淡红色 */
    border-color: #fee2e2;
}

.data-card.feelTemp::before {
    background: linear-gradient(90deg, #ef4444, #dc2626);
}

.data-card.feelTemp .data-value {
    color: #2c3e50;
}

.data-card.updateTime {
    background-color: #f8fafc;
    border-color: #e2e8f0;
}

.data-card.updateTime::before {
    background: linear-gradient(90deg, #64748b, #475569);
}

.data-card.updateTime .data-value {
    color: #334155;
    font-size: 1.8rem;
}

/* Device status indicator */
.device-status {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 12px 20px;
    border-radius: 25px;
    font-weight: 600;
    font-size: 14px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: all 0.3s ease;
}

.device-status.connected {
    background-color: #10b981;
    color: white;
    border: 2px solid #059669;
}

.device-status.disconnected {
    background-color: #ef4444;
    color: white;
    border: 2px solid #dc2626;
    animation: pulseWarning 1.5s infinite;
}

@keyframes pulseWarning {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

/* History Section */
.query-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 25px;
    align-items: center;
    padding: 15px;
    background-color: #f8f9fa;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.date-inputs {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.date-input-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.date-input-group label {
    font-weight: 600;
    color: #555;
    font-size: 14px;
}

.date-input-group input {
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
}

.query-btn {
    align-self: flex-end;
    margin-top: 10px;
}

.history-table-container {
    overflow-x: auto;
    margin-top: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.history-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background-color: #ffffff;
    border-radius: 8px;
    overflow: hidden;
}

.history-table th,
.history-table td {
    padding: 16px 20px;
    text-align: left;
    border-bottom: 1px solid #eee;
    white-space: nowrap;
    font-size: 15px;
    line-height: 1.4;
}

.history-table th {
    background-color: #f8f9fa;
    font-weight: 700;
    color: #2c3e50;
    text-transform: uppercase;
    font-size: 13px;
    letter-spacing: 0.5px;
    border-bottom: 2px solid #e9ecef;
    position: sticky;
    top: 0;
    z-index: 10;
}

.history-table td {
    color: #495057;
}

.history-table tr:hover {
    background-color: #f8f9fa;
    transition: background-color 0.2s ease;
}

.history-table tr:last-child td {
    border-bottom: none;
}

/* Add some spacing between query controls and table */

.date-input-group label {
    font-weight: 600;
    color: #495057;
}

.date-input-group input[type="datetime-local"] {
    padding: 8px 12px;
    border: 1px solid #ced4da;
    border-radius: 4px;
    font-size: 14px;
}

.query-btn {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 600;
    transition: background-color 0.3s ease;
}

.query-btn:hover {
    background-color: #2980b9;
}

/* Chart Section */
.chart-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 20px;
    align-items: center;
}

.chart-type-selector {
    display: flex;
    flex-wrap: wrap;
    gap: 25px;
    align-items: center;
}

.chart-type-group {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 5px 0;
}

.chart-type-group input[type="checkbox"] {
    margin: 0;
    transform: scale(1.2);
}

.chart-type-group label {
    font-weight: 500;
    cursor: pointer;
}

.chart-controls .form-group {
    gap: 15px;
    flex-wrap: wrap;
}

.chart-controls input[type="checkbox"] {
    margin-right: 5px;
}

.chart-container {
    height: 400px;
    position: relative;
}

/* Configuration Section */
.config-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.config-button {
    background-color: #4CAF50;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: background-color 0.3s ease;
}

.config-button:hover {
    background-color: #45a049;
}

.config-form {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    align-items: center;
    background-color: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    border: 1px solid #e9ecef;
}

/* Modal Styles */
.modal {
    display: none; /* Hidden by default */
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgb(0,0,0);
    background-color: rgba(0,0,0,0.4);
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {opacity: 0;}
    to {opacity: 1;}
}

.modal-content {
    background-color: #fefefe;
    margin: 10% auto;
    padding: 0;
    border-radius: 8px;
    width: 90%;
    max-width: 400px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {transform: translateY(-50px); opacity: 0;}
    to {transform: translateY(0); opacity: 1;}
}

.modal-content h3 {
    margin: 0;
    padding: 20px;
    background-color: #3498db;
    color: white;
    border-radius: 8px 8px 0 0;
    font-size: 1.4rem;
    text-align: center;
}

.modal-body {
    padding: 20px;
}

.modal-footer {
    padding: 15px 20px;
    background-color: #f8f9fa;
    border-top: 1px solid #e9ecef;
    border-radius: 0 0 8px 8px;
    text-align: right;
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    position: absolute;
    right: 20px;
    top: 15px;
    cursor: pointer;
}

.close:hover, .close:focus {
    color: #000;
    text-decoration: none;
}

.error-message {
    color: #c62828;
    background-color: #ffebee;
    padding: 10px;
    border-radius: 4px;
    margin-top: 15px;
    font-size: 14px;
    text-align: center;
}

.login-btn {
    background-color: #3498db;
    color: white;
}

.login-btn:hover {
    background-color: #2980b9;
}

.cancel-btn {
    background-color: #95a5a6;
    color: white;
}

.cancel-btn:hover {
    background-color: #7f8c8d;
}

/* 内容区块样式 */
section {
    background-color: #ffffff;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
    padding: 25px;
}

section h2 {
    color: #2c3e50;
    margin-bottom: 20px;
    font-size: 1.8rem;
    border-bottom: 2px solid #3498db;
    padding-bottom: 10px;
}

/* Settings Page Styles */
.settings-group {
    margin-bottom: 12px;
    padding: 8px;
    background-color: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid #3498db;
}

/* Bottom configuration area */
.settings-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid #eee;
}

/* Basic config at bottom - no background or border */
.settings-group.basic-config {
    margin: 0;
    padding: 0;
    flex: 1;
    min-width: 400px;
    background: none;
    border: none;
}

/* 响应式设计 - 移动设备优化 */
@media (max-width: 768px) {
    /* 底部配置区域改为垂直排列 */
    .settings-bottom {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    /* 移除最小宽度限制，允许在小屏幕上收缩 */
    .settings-group.basic-config {
        min-width: 100%;
        width: 100%;
    }
    
    /* 表单行在小屏幕上增加间距 */
    .form-row {
        gap: 15px;
    }
    
    /* 表单组在小屏幕上占满宽度 */
    .form-group {
        min-width: 100%;
    }
    
    /* 设置操作区域在小屏幕上占满宽度 */
    .settings-actions {
        width: 100%;
        justify-content: space-between;
        margin-top: 10px;
    }
    
    /* 按钮在小屏幕上调整大小 - 确保所有按钮保持一致的大小 */
    .settings-actions button,
    .settings-actions .login-button,
    .settings-actions .logout-button,
    .settings-actions .save-btn {
        padding: 10px 15px;
        font-size: 14px;
        flex: 1;
        justify-content: center;
        height: 45px;
        min-width: 100px;
    }
    
    /* 确保所有按钮在小屏幕上具有相同的宽度 */
    .settings-actions {
        display: flex;
        gap: 10px;
        width: 100%;
    }
    
    /* 在小屏幕上增加输入框的宽度 */
    .form-group input {
        width: 100%;
    }
    
    /* 在非常小的屏幕上只显示按钮图标 */
    @media (max-width: 480px) {
        .settings-actions button span {
            display: none;
        }
        
        .settings-actions button {
            padding: 8px;
            flex: 1;
            min-width: 40px;
        }
    }
}

/* Adjust settings actions for bottom layout */
.settings-actions {
    margin: 0;
    padding: 0;
    border-top: none;
    align-self: flex-end;
}

.settings-group h3 {
    color: #2c3e50;
    margin-bottom: 8px;
    font-size: 1.1rem;
}

.param-group {
    margin-bottom: 8px;
    padding: 6px;
    background-color: white;
    border-radius: 6px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.param-group h4 {
    color: #34495e;
    margin-bottom: 6px;
    font-size: 0.95rem;
}

.form-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 6px;
}

.form-group {
    flex: 1;
    min-width: 170px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.form-group label {
    font-weight: 600;
    color: #555;
    font-size: 12px;
    display: flex;
    align-items: center;
    gap: 3px;
}

.logic-tip {
    font-weight: 400;
    color: #7f8c8d;
    font-size: 10px;
    font-style: italic;
    background-color: #f0f0f0;
    padding: 1px 4px;
    border-radius: 3px;
    white-space: nowrap;
}

.form-group input {
    padding: 6px 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 12px;
    transition: border-color 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

.settings-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    align-items: center;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid #eee;
}

.save-btn {
    background-color: #27ae60;
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s ease;
}

.save-btn:hover {
    background-color: #229954;
}

/* 系统设置页面中的登录/注销按钮样式 - 与保存按钮保持一致的视觉风格 */
.settings-actions .login-button,
.settings-actions .logout-button {
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: background-color 0.3s ease;
    display: flex;
    align-items: center;
    gap: 5px;
}

/* 登录按钮样式 */
.settings-actions .login-button {
    background-color: #3498db;
}

.settings-actions .login-button:hover {
    background-color: #2980b9;
}

/* 注销按钮样式 */
.settings-actions .logout-button {
    background-color: #e74c3c;
}

.settings-actions .logout-button:hover {
    background-color: #c0392b;
}

/* Calculation Flow Visualization */
.calculation-flow {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    padding: 20px;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.flow-node {
    background-color: #f0f8ff;
    border: 2px solid #3498db;
    border-radius: 8px;
    padding: 15px;
    text-align: center;
    min-width: 180px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    position: relative;
}

.flow-node:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.15);
}

.flow-node.main-node {
    background-color: #e3f2fd;
    border-color: #2196f3;
    min-width: 250px;
}

.flow-node.final-node {
    background-color: #e8f5e9;
    border-color: #4caf50;
    min-width: 250px;
}

.flow-node h4 {
    color: #2196f3;
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.flow-node h5 {
    color: #333;
    margin-bottom: 8px;
    font-size: 1rem;
}

.flow-node p {
    color: #666;
    margin: 5px 0;
    font-size: 0.9rem;
}

.flow-node .param-ref {
    color: #7f8c8d;
    font-size: 0.8rem;
    font-style: italic;
}

.flow-row {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
}

.flow-arrow {
    width: 0;
    height: 0;
    margin: 10px auto 0;
    border-left: 10px solid transparent;
    border-right: 10px solid transparent;
    border-top: 15px solid #3498db;
}

.flow-row .flow-arrow {
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
}

/* Flow Input Styles */
.flow-input {
    padding: 4px 6px;
    border: 1px solid #ddd;
    border-radius: 3px;
    font-size: 0.85rem;
    width: 80px;
    transition: border-color 0.3s ease;
    background-color: white;
}

.flow-input:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

/* Validation styles */
.flow-input.valid-input {
    border-color: #27ae60;
    box-shadow: 0 0 0 2px rgba(39, 174, 96, 0.2);
}

.flow-input.invalid-input {
    border-color: #e74c3c;
    box-shadow: 0 0 0 2px rgba(231, 76, 60, 0.2);
}

/* Adjust margin for flow nodes with inputs */
.flow-node p {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 8px 0;
    gap: 8px;
}

.flow-node p span {
    white-space: nowrap;
}

/* Responsive Design */
@media (max-width: 768px) {
    .navbar-brand {
        gap: 10px;
    }
    
    .navbar-brand h1 {
        font-size: 1.4rem;
    }
    
    .navbar-logo {
        height: 35px;
    }

    .sidebar {
        width: 150px;
        padding: 10px 0;
    }

    .nav-item {
        padding: 12px 15px;
        font-size: 14px;
    }

    .nav-icon {
        font-size: 16px;
    }

    .content {
        padding: 15px;
    }

    section {
        padding: 15px;
    }

    .data-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 10px;
    }

    .data-value {
        font-size: 2rem;
    }

    .history-controls,
    .chart-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .form-group {
        flex-direction: column;
        align-items: stretch;
        gap: 5px;
    }

    .chart-container {
        height: 300px;
    }
}

@media (max-width: 480px) {
    .navbar {
        flex-direction: column;
        gap: 10px;
        padding: 10px;
    }

    .navbar-brand {
        gap: 8px;
    }
    
    .navbar-brand h1 {
        font-size: 1.2rem;
    }
    
    .navbar-logo {
        height: 30px;
    }

    .main-container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        padding: 10px 0;
    }

    .nav-menu {
        display: flex;
        flex-wrap: wrap;
    }

    .nav-item {
        flex: 1;
        min-width: 120px;
        padding: 10px;
        justify-content: center;
    }

    .data-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .form-group input {
        min-width: auto;
    }
}