Button Group

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Button Group</title>
    <style>
        /*
         Component: Button Group
         Description: A set of related buttons that are visually joined together.
        */
        :root {
            --btn-group-border-color: #007bff;
            --btn-group-bg: #ffffff;
            --btn-group-text-color: var(--btn-group-border-color);
            --btn-group-bg-hover: #007bff;
            --btn-group-text-hover: #ffffff;
            --btn-group-focus-outline: #007bff;
        }

.btn-group-container-1 {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 2rem;
            background-color: #f8f9fa;
        }

.btn-group-1 {
            display: inline-flex;
            border-radius: 8px; /* The container has the radius */
            overflow: hidden; /* This helps with border-radius on children */
        }
        
        .btn-group-1 button {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            padding: 0.8rem 1.5rem;
            font-size: 1rem;
            font-weight: 600;
            line-height: 1.5;
            
            color: var(--btn-group-text-color);
            background-color: var(--btn-group-bg);
            
            border: 1px solid var(--btn-group-border-color);
            border-radius: 0; /* Individual buttons have no radius initially */
            
            cursor: pointer;
            transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out;
        }

/* --- Joining Logic --- */
        /* All but the first child have their left border removed via negative margin */
        .btn-group-1 button:not(:first-child) {
            margin-left: -1px;
        }

/* All but the last child */
        .btn-group-1 button:not(:last-child) {
            border-right-width: 1px;
        }

/* Apply border-radius to the first and last buttons in the group */
        .btn-group-1 button:first-child {
            border-top-left-radius: 8px;
            border-bottom-left-radius: 8px;
        }
        
        .btn-group-1 button:last-child {
            border-top-right-radius: 8px;
            border-bottom-right-radius: 8px;
        }
        
        /* --- Interaction States --- */
        .btn-group-1 button:hover {
            background-color: var(--btn-group-bg-hover);
            color: var(--btn-group-text-hover);
            z-index: 2; /* Bring the hovered button to the front */
        }

.btn-group-1 button:focus-visible {
            outline: 2px solid var(--btn-group-focus-outline);
            outline-offset: 2px;
            z-index: 3;
        }

.btn-group-1 button svg {
            width: 18px;
            height: 18px;
            fill: currentColor;
        }

</style>
</head>
<body>

</body>
</html>