:root {
  --navy: #1f4e79;
  --bg: #f7f8fa;
  --card: #ffffff;
  --muted: #5b6573;
  --line: #d9e0e8;
  --text: #1a1a1a;
  --accent: #eef2f6;
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, sans-serif;
  line-height: 1.45;
}
body { min-height: 100vh; }
.wrap {
  max-width: 880px;
  margin: 0 auto;
  padding: 24px 16px 64px;
}
h1 { margin: 0 0 6px; font-size: 1.7rem; color: var(--navy); }
.lede { color: var(--muted); margin: 0 0 20px; }
.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 16px;
}
.row { display: flex; flex-wrap: wrap; gap: 12px; align-items: end; }
label { display: block; font-size: 0.85rem; color: var(--muted); margin-bottom: 4px; }
select, input, textarea, button {
  font: inherit;
}
select, input[type="password"], input[type="text"] {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}
.grow { flex: 1; min-width: 160px; }
button {
  background: var(--navy);
  color: #fff;
  border: 0;
  border-radius: 8px;
  padding: 9px 14px;
  cursor: pointer;
}
button.secondary {
  background: var(--accent);
  color: var(--navy);
  border: 1px solid var(--line);
}
button:disabled { opacity: 0.55; cursor: wait; }
textarea {
  width: 100%;
  min-height: 240px;
  font-family: Consolas, "Cascadia Mono", monospace;
  font-size: 0.92rem;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
}
.meta { display: flex; gap: 12px; flex-wrap: wrap; color: var(--muted); font-size: 0.9rem; }
code, pre {
  font-family: Consolas, "Cascadia Mono", monospace;
  background: var(--accent);
  border-radius: 6px;
}
pre {
  padding: 10px 12px;
  overflow: auto;
  white-space: pre-wrap;
}
.tabs { display: flex; gap: 8px; flex-wrap: wrap; margin: 8px 0; }
.tabs button { background: var(--accent); color: var(--navy); }
.tabs button.active { background: var(--navy); color: #fff; }
.warn { background: #fff6e5; border: 1px solid #f0d9a6; padding: 10px 12px; border-radius: 8px; }
.err { background: #fdecee; border: 1px solid #f3c0c6; padding: 10px 12px; border-radius: 8px; }
.ok { color: var(--navy); }
.solution { margin: 16px 0 8px; padding-top: 8px; border-top: 1px solid var(--line); }
@media print {
  .no-print { display: none !important; }
  body { background: #fff; }
  .panel { break-inside: avoid; }
}