:root { --bg: #0d1117; --panel: #161b22; --border: #30363d; --fg: #e6edf3; --muted: #8b949e; --accent: #2f81f7; }
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--fg); font: 14px/1.5 ui-sans-serif, system-ui, sans-serif; }
body { display: flex; flex-direction: column; }
header { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; padding: 8px 16px; background: var(--panel); border-bottom: 1px solid var(--border); }
header .brand { font-weight: 700; margin-right: auto; color: var(--fg); text-decoration: none; }
select, button { background: var(--bg); color: var(--fg); border: 1px solid var(--border); border-radius: 6px; padding: 5px 10px; font: inherit; }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; cursor: pointer; }
button:disabled { opacity: .6; cursor: default; }
textarea { flex: 1; width: 100%; padding: 16px; border: 0; outline: 0; resize: none; background: var(--bg); color: var(--fg);
           font: 13px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace; tab-size: 4; }
#error { color: #f85149; }
label { display: flex; gap: 4px; align-items: center; color: var(--muted); cursor: pointer; }
kbd { color: var(--muted); font-size: 12px; }