:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #252525;
    --text-primary: #e0e0e0;
    --text-secondary: #888;
    --accent: #00ff41;
    --accent-dim: rgba(0, 255, 65, 0.1);
    --error: #ff5f56;
    --warning: #ffbd2e;
    --border: #333;
}

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

body {
    font-family: 'Fira Code', 'Monaco', monospace;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
}

.container { min-height: 100vh; display: flex; flex-direction: column; }

.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo { font-size: 1.1em; font-weight: 600; }
.logo .prompt { color: var(--accent); margin-right: 8px; }

.nav { display: flex; gap: 20px; }
.nav-link { color: var(--text-secondary); text-decoration: none; font-size: 0.9em; }
.nav-link:hover { color: var(--accent); }

.main { flex: 1; display: flex; flex-direction: column; padding: 20px; gap: 15px; }

.toolbar { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; }
.toolbar-left, .toolbar-center, .toolbar-right { display: flex; gap: 8px; }

.btn {
    padding: 8px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.85em;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.2s;
}
.btn:hover { border-color: var(--accent); background: var(--accent-dim); }
.btn-primary { border-color: var(--accent); background: var(--accent-dim); }

.btn-small { padding: 4px 10px; font-size: 0.8em; }

.file-input-wrapper { position: relative; }
.file-input-wrapper input { position: absolute; opacity: 0; width: 0; height: 0; }

.status-bar {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    padding: 8px 15px;
    border-radius: 4px;
    display: flex;
    justify-content: space-between;
    font-size: 0.9em;
}
.status-bar.error { border-color: var(--error); }
.status-bar.success { border-color: var(--accent); }

.editor-container { flex: 1; display: grid; grid-template-columns: 1fr 1fr; gap: 15px; min-height: 0; }

.panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.panel-header {
    background: var(--bg-tertiary);
    padding: 10px 15px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.panel-title { font-size: 0.9em; font-weight: 600; }
.panel-info { font-size: 0.8em; color: var(--text-secondary); }
.panel-actions { display: flex; gap: 5px; }

.json-textarea {
    flex: 1;
    background: var(--bg-primary);
    border: none;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9em;
    padding: 15px;
    resize: none;
    outline: none;
}

.json-tree { flex: 1; background: var(--bg-primary); padding: 15px; overflow: auto; font-size: 0.9em; }

.empty-state { color: var(--text-secondary); text-align: center; margin-top: 50px; }
.empty-state .prompt { color: var(--accent); }

.tree-item { display: flex; align-items: flex-start; gap: 5px; }
.tree-key { color: #7ee787; cursor: pointer; }
.tree-key:hover { text-decoration: underline; }
.tree-string { color: #a5d6ff; }
.tree-number { color: #79c0ff; }
.tree-boolean { color: #ff7b72; }
.tree-null { color: #ff7b72; font-style: italic; }
.tree-bracket { color: var(--text-secondary); }
.tree-toggle { color: var(--accent); cursor: pointer; user-select: none; width: 12px; display: inline-block; }
.tree-children { margin-left: 20px; border-left: 1px solid var(--border); padding-left: 8px; }
.tree-children.collapsed { display: none; }
.tree-preview { color: var(--text-secondary); font-size: 0.9em; margin-left: 5px; }

.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 15px 20px;
    text-align: center;
    font-size: 0.85em;
    color: var(--text-secondary);
}
.footer a { color: var(--accent); text-decoration: none; }

@media (max-width: 900px) {
    .editor-container { grid-template-columns: 1fr; grid-template-rows: 1fr 1fr; }
    .toolbar { flex-direction: column; align-items: stretch; }
}