:root {
  --bg: #0b0f17;
  --card: #131826;
  --accent: #4f8cff;
  --text: #e6edf6;
  --muted: #7c8aa0;
  --err: #ff6b6b;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}
.box { width: min(440px, 92vw); }
h1 { margin: 0 0 4px; font-size: 26px; }
.sub { color: var(--muted); margin: 0 0 18px; }
.card {
  background: var(--card);
  border: 1px solid #1f2738;
  border-radius: 12px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
label { font-size: 13px; color: var(--muted); }
input {
  background: #0f1117;
  color: var(--text);
  border: 1px solid #232733;
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 14px;
}
.btn {
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 14px;
  cursor: pointer;
}
.btn:hover { filter: brightness(1.08); }
.btn.small { padding: 6px 10px; font-size: 12px; }
.hidden { display: none; }
.result { margin-top: 8px; }
.keyrow { display: flex; gap: 8px; align-items: center; }
code {
  background: #0f1117;
  border: 1px solid #232733;
  border-radius: 8px;
  padding: 10px;
  font-size: 14px;
  flex: 1;
  word-break: break-all;
}
.err { color: var(--err); font-size: 13px; min-height: 16px; margin: 0; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
hr { border: 0; border-top: 1px solid #1f2738; margin: 14px 0 0; }