:root {
    --bg-color: #ffffff;
    --panel-bg: #e8eaed;
    --border-color: #d1d5da;
    --text-primary: #24292f;
    --text-secondary: #57606a;
    --accent-color: #0969da;
    --accent-hover: #0550ae;
    --error-color: #cf222e;
    --key-color: #0550ae;
    --string-color: #24292f;
    --number-color: #0550ae;
    --boolean-color: #cf222e;
    --null-color: #b08800;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-color);
    color: var(--text-primary);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.top-nav {
    padding: 8px 24px;
    padding: 8px 24px 0 24px;
    background-color: var(--panel-bg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: flex-end;
}

.logo {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.tabs {
    display: flex;
    gap: 2px;
}

.tab-btn {
    padding: 6px 20px;
    border: 1px solid var(--border-color);
    border-bottom: none;
    background: #e0e2e5;
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: 6px 6px 0 0;
    transition: all 0.2s;
    margin-bottom: -1px;
    position: relative;
    z-index: 1;
}

.tab-btn:hover {
    background-color: #f1f3f4;
    color: var(--text-primary);
}

.tab-btn.active {
    background-color: #ffffff;
    color: var(--text-primary);
    font-weight: 500;
    border-bottom: 1px solid #ffffff;
    z-index: 2;
}

.toolbar {
    padding: 8px 24px;
    background-color: #f1f3f4;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    gap: 8px;
    align-items: center;
}

.toolbar.hidden {
    display: none;
}

.btn {
    padding: 5px 10px;
    border: 1px solid var(--border-color);
    background-color: transparent;
    color: var(--text-primary);
    font-size: 0.8rem;
    font-weight: 500;
    font-family: var(--font-sans);
    cursor: pointer;
    border-radius: 6px;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.15s;
}

.btn:hover {
    background-color: #f6f8fa;
    border-color: #d0d7de;
}

.btn:active {
    background-color: #ebeff2;
}

main {
    flex: 1;
    position: relative;
    overflow: hidden;
}

#text-pane,
#viewer-pane {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
}

#text-pane.active,
#viewer-pane.active {
    display: flex;
}

textarea#json-input {
    width: 100%;
    height: 100%;
    padding: 20px;
    border: none;
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.6;
    resize: none;
    outline: none;
}

textarea#json-input::placeholder {
    color: var(--text-secondary);
}

#viewer-pane {
    padding: 24px;
    overflow: auto;
    background-color: var(--bg-color);
}

/* Tree View Styles */
.tree-container {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.6;
}

.tree-node {
    margin-left: 24px;
    position: relative;
}

.tree-line {
    display: flex;
    align-items: center;
    padding: 2px 0;
}

.tree-toggle,
.tree-toggle-spacer {
    width: 14px;
    height: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-right: 8px;
    font-size: 10px;
    cursor: pointer;
    user-select: none;
    border: 1px solid #c0c0c0;
    color: #444;
    background: #f9f9f9;
}

.tree-toggle-spacer {
    border: none;
    background: transparent;
    cursor: default;
}

.tree-icon {
    font-weight: 700;
    margin-right: 6px;
    font-size: 1rem;
    display: inline-block;
}

.tree-icon-object,
.tree-icon-array {
    color: #111199;
}

.tree-icon-value {
    font-size: 0.8rem;
    margin-right: 8px;
    margin-left: 2px;
}

.tree-icon-string {
    color: #2222aa;
}

.tree-icon-number {
    color: #22aa22;
}

.tree-key {
    color: #333;
    font-weight: 500;
}

.tree-separator {
    color: #444;
}

.tree-value-string {
    color: #000;
}

.tree-value-number {
    color: #000;
}

.tree-value-boolean {
    color: #111199;
}

.tree-value-null {
    color: #b08800;
}

.tree-meta {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-left: 2px;
}

.closing-brace {
    display: none;
    /* Hide in this theme */
}

/* Status Bar */
.status-bar {
    height: 28px;
    padding: 0 24px;
    background-color: var(--panel-bg);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    color: var(--text-secondary);
    z-index: 20;
}

.status-bar.error {
    background-color: #ffeef0;
    color: var(--error-color);
}

#status-stats {
    font-family: var(--font-mono);
    color: var(--text-primary);
    font-weight: 500;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border: 3px solid var(--bg-color);
    border-radius: 6px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}