/* 全局样式 */
body {
    background-color: #f2f2f7;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
    color: #1c1c1e;
    margin: 0;
    padding: 20px;
}

/* 居中显示主要内容 */
.runoob-page-content {
    max-width: 800px;
    margin: 0 auto;
}

/* 卡片样式 */
.card {
    background-color: #ffffff;
    border-radius: 16px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
    overflow: hidden;
}

/* 卡片头部 */
.card-header {
    padding: 16px;
    border-bottom: 1px solid #e5e5ea;
    font-size: 18px;
    font-weight: bold;
    color: #1c1c1e;
    background-color: #f9f9fb;
}

/* 卡片主体 */
.card-body {
    padding: 16px;
}

/* 表单区域 */
.form-row {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

/* 左侧设置面板 */
.col-md-4 {
    flex: 1;
    min-width: 260px;
    background-color: #ffffff;
    border: 1px solid #e5e5ea;
    border-radius: 16px;
    padding: 16px;
}

/* 右侧输出区域 */
.col-md-8 {
    flex: 2;
    min-width: 300px;
    background-color: #ffffff;
    border: 1px solid #e5e5ea;
    border-radius: 16px;
    padding: 16px;
}

/* 输入框及输入组 */
.input-group {
    margin-bottom: 16px;
}

.input-group-text {
    background-color: #f2f2f7;
    border: 1px solid #e5e5ea;
    border-right: none;
    border-radius: 8px 0 0 8px;
    padding: 10px;
}

.form-control {
    border: 1px solid #e5e5ea;
    border-radius: 0 8px 8px 0;
    padding: 10px;
    box-shadow: none;
    height: auto;
}

.form-control:focus {
    border-color: #007aff;
    box-shadow: 0 0 0 0.2rem rgba(0,122,255,0.25);
}

/* 按钮样式 */
.btn {
    border-radius: 12px;
    padding: 10px 20px;
    font-weight: 600;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.btn-outline-primary {
    border: 1px solid #007aff;
    color: #007aff;
    background-color: transparent;
}

.btn-outline-primary:hover {
    background-color: #007aff;
    color: #ffffff;
}

.btn-outline-warning {
    border: 1px solid #ff9500;
    color: #ff9500;
    background-color: transparent;
}

.btn-outline-warning:hover {
    background-color: #ff9500;
    color: #ffffff;
}

/* 文本区域 */
textarea.form-control {
    border: 1px solid #e5e5ea;
    border-radius: 12px;
    padding: 10px;
    box-shadow: none;
    resize: none;
}

/* 复选框标签 */
.form-check {
    margin-top: 10px;
}

.form-check-label {
    font-size: 14px;
    margin-left: 8px;
}

/* Tooltip 样式（简单模拟 iOS 提示） */
.tooltip-inner {
    background-color: #1c1c1e;
    color: #ffffff;
    border-radius: 8px;
    padding: 6px 12px;
    font-size: 12px;
}
.tooltip.bs-tooltip-top .arrow::before {
    border-top-color: #1c1c1e;
}