:root {
    /* Light Theme Variables */
    --bg-color: #f8fafc;
    --panel-bg: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --border-color: #e2e8f0;
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --header-bg: #ffffff;
    --btn-bg: #f1f5f9;
    --btn-hover: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --ad-bg: #f1f5f9;
}

[data-theme="dark"] {
    /* Dark Theme Variables */
    --bg-color: #0f172a;
    --panel-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --primary-color: #3b82f6;
    --primary-hover: #60a5fa;
    --header-bg: #1e293b;
    --btn-bg: #334155;
    --btn-hover: #475569;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.4);
    --ad-bg: #1e293b;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
    height: 100vh;
    transition: background-color 0.3s, color 0.3s;
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1.5rem;
    background-color: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    z-index: 10;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
    font-size: 1.25rem;
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.actions button, .file-upload-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--btn-bg);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 0.5rem 0.75rem;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    font-family: 'Inter', sans-serif;
}

.actions button:hover, .file-upload-btn:hover {
    background-color: var(--btn-hover);
    color: var(--text-primary);
}

.icon-btn {
    padding: 0.5rem !important;
    border-radius: 50% !important;
    width: 36px;
    height: 36px;
    justify-content: center;
}

.divider {
    width: 1px;
    height: 24px;
    background-color: var(--border-color);
    margin: 0 0.25rem;
}

/* Ad Containers */
.ad-container {
    width: 100%;
    background-color: var(--ad-bg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid var(--border-color);
    padding: 1rem;
    min-height: 90px; /* Minimum height for typical top banner ad */
    position: relative;
    overflow: hidden;
}

.bottom-ad {
    border-top: 1px solid var(--border-color);
    border-bottom: none;
    margin-top: auto;
}

.ad-placeholder-text {
    font-size: 0.75rem;
    color: var(--text-secondary);
    position: absolute;
    top: 5px;
    left: 5px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Editor Main Area */
.editor-container {
    display: flex;
    flex: 1;
    overflow: hidden;
    padding: 1rem;
    gap: 1rem;
}

.panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.panel-header {
    padding: 0.75rem 1rem;
    background-color: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.editor-instance {
    flex: 1;
    overflow: hidden; /* JSONEditor handles its own scroll */
}

/* Middle Controls */
.panel-controls {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 1rem;
}

.panel-controls button {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: white;
    border: none;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: background-color 0.2s, transform 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.panel-controls button:hover {
    background-color: var(--primary-hover);
    transform: scale(1.05);
}

/* JSONEditor Customizations for Dark Mode */
[data-theme="dark"] .jsoneditor {
    border: none;
}
[data-theme="dark"] .jsoneditor-menu {
    background-color: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
}
[data-theme="dark"] .jsoneditor-outer {
    background-color: var(--panel-bg);
}
[data-theme="dark"] div.jsoneditor-tree, 
[data-theme="dark"] textarea.jsoneditor-text,
[data-theme="dark"] div.jsoneditor-field,
[data-theme="dark"] div.jsoneditor-value {
    color: var(--text-primary);
    background-color: var(--panel-bg);
}

[data-theme="dark"] .jsoneditor-readonly {
    color: var(--text-secondary);
}

[data-theme="dark"] table.jsoneditor-search input {
    background: var(--btn-bg);
    color: var(--text-primary);
}

/* Hide JSONEditor Default Menu if preferred (we are using custom header) */
.jsoneditor-menu {
    display: none;
}
.jsoneditor {
    border: none;
}

/* Responsive */
@media (max-width: 768px) {
    .editor-container {
        flex-direction: column;
    }
    
    .panel-controls {
        flex-direction: row;
    }
    
    .panel-controls button {
        transform: rotate(90deg);
    }
    .panel-controls button:hover {
        transform: rotate(90deg) scale(1.05);
    }
    
    .actions .btn-text {
        display: none;
    }
    .actions button, .file-upload-btn {
        padding: 0.5rem;
    }
}