html, body {
    height: 100%;
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: #f0f2f5;
    overflow: hidden; /* Prevent body scroll */
}

.main-container {
    display: flex;
    height: 100vh;
}

.left-panel {
    flex: 0 0 300px; /* Fixed width for the tree */
    padding: 15px;
    border-right: 1px solid #ddd;
    background-color: #f9f9f9;
    overflow-y: auto;
    font-family: 'Courier New', Courier, monospace;
    font-size: 14px;
    white-space: nowrap;
}

.right-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 20px;
    overflow: hidden; /* Prevent right panel from scrolling independently */
}

h1 {
    text-align: center;
    color: #333;
    margin-top: 0;
    margin-bottom: 20px;
    flex-shrink: 0;
}

#json-input {
    width: 100%;
    height: 200px; /* Fixed height */
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 14px;
    resize: vertical;
    box-sizing: border-box;
    flex-shrink: 0;
}

.button-group {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-top: 15px;
    flex-shrink: 0;
}

#format-btn {
    width: 90%;
    padding: 12px 20px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    flex: 0 0 auto;
}

#format-btn:hover {
    background-color: #0056b3;
}

.minify-option {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background-color: #f8f9fa;
    border: 1px solid #ced4da;
    border-radius: 4px;
    font-size: 14px;
}

#minify-checkbox {
    margin: 0;
    cursor: pointer;
}

label[for="minify-checkbox"] {
    cursor: pointer;
    margin: 0;
}

#json-output {
    margin-top: 20px;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background-color: #f9f9f9;
    font-family: 'Courier New', Courier, monospace;
    font-size: 14px;
    white-space: pre; /* Use pre for better control */
    word-wrap: break-word;
    overflow: auto; /* Allow scrolling */
    flex-grow: 1; /* Take remaining space */
}

/* --- Tree Styles --- */
.tree-item {
    padding-left: 20px;
    position: relative;
    cursor: pointer;
}

.tree-item:hover {
    background-color: #e0e0e0;
}

.tree-toggle {
    position: absolute;
    left: 0;
    top: 0;
    width: 15px;
    text-align: center;
}

.tree-toggle.collapsed::before { content: '▶'; }
.tree-toggle:not(.collapsed)::before { content: '▼'; }

.tree-content { display: block; }
.tree-content.collapsed { display: none; }
.tree-key { color: #a52a2a; }
.tree-size { color: #808080; margin-left: 5px; }
.tree-size-indicator { color: #808080; margin-left: 5px; font-size: 12px; }

/* --- JSON Output Styles --- */
.json-key { color: #a52a2a; }
.json-string { color: #008000; }
.json-number { color: #0000ff; }
.json-boolean { color: #ff00ff; }
.json-null { color: #808080; }

.collapsible {
    cursor: pointer;
    position: relative;
    padding-left: 15px;
}

.collapsible::before {
    content: '▼';
    position: absolute;
    left: 0;
    font-size: 10px;
    color: #666;
    transform: translateY(3px);
}

.collapsible.collapsed::before { content: '▶'; }

.collapsible-content {
    display: block;
    margin-left: 20px;
    border-left: 1px dotted #ccc;
    padding-left: 10px;
}

.collapsible-content.collapsed { display: none; }

.json-inline {
    display: inline;
    margin-left: 5px;
}

/* --- Flash Animation --- */
@keyframes flash {
    0%, 100% { background-color: transparent; }
    50% { background-color: #ffff99; }
}

.flash {
    animation: flash 0.25s 4; /* 0.25s per flash, 4 times */
}

/* --- Context Menu Styles --- */
.context-menu {
    position: absolute;
    display: none;
    list-style: none;
    margin: 0;
    padding: 8px 0;
    background-color: #fff;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 14px;
}

.context-menu.visible {
    display: block;
}

.context-menu li {
    padding: 8px 16px;
    cursor: pointer;
}

.context-menu li:hover {
    background-color: #f0f0f0;
}