:root { color-scheme: dark; font: 13px system-ui, sans-serif; color: #d4d4d4; background: #1e1e1e; }
* { box-sizing: border-box; }
body { margin: 0; height: 100vh; display: flex; flex-direction: column; overflow: hidden; }
header { display: flex; align-items: center; gap: 8px; padding: 8px; border-bottom: 1px solid #454545; }
button { font: inherit; color: inherit; background: #333; border: 1px solid #555; padding: 5px 16px; border-radius: 2px; cursor: pointer; }
button:hover { background: #404040; }
button:disabled { opacity: .5; cursor: default; }
button:focus-visible, textarea:focus-visible, pre:focus-visible { outline: 1px solid #007acc; outline-offset: -1px; }
#filename { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; margin-left: 8px; }
main { min-height: 0; flex: 1; display: grid; grid-template-rows: minmax(160px, 2fr) minmax(100px, 1fr); }
#editor { min-height: 0; overflow: hidden; }
#panels { min-height: 0; display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid #454545; }
section { min-width: 0; min-height: 0; display: flex; flex-direction: column; }
section + section { border-left: 1px solid #454545; }
label { padding: 5px 10px; background: #252526; }
textarea, pre { margin: 0; padding: 8px 10px; border: 0; color: inherit; background: #1e1e1e; font: 14px Consolas, Menlo, monospace; tab-size: 4; }
textarea { flex: 1; min-height: 0; width: 100%; resize: none; border-radius: 0; }
pre { flex: 1; min-height: 0; overflow: auto; white-space: pre-wrap; overflow-wrap: anywhere; }
footer { min-height: 24px; padding: 3px 10px; border-top: 1px solid #454545; }
.invalid-bracket { color: #f44747 !important; }