:root {
  color-scheme: light dark;
  --bg: #fbfbfd;
  --fg: #1c1c1f;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent-2: #6b7280;
  --ok: #047857;
  --err: #b91c1c;
  --line: #e5e7eb;
  --code-bg: #f3f4f6;
  --tab-bg: #f3f4f6;
  --tab-active-bg: #ffffff;
  --pad: 18px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e0e10;
    --fg: #f5f5f7;
    --muted: #9ca3af;
    --line: #27272a;
    --code-bg: #18181b;
    --tab-bg: #18181b;
    --tab-active-bg: #0e0e10;
  }
}

* { box-sizing: border-box; }
body {
  background: var(--bg);
  color: var(--fg);
  font: 14px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
  margin: 0;
}
main {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 24px 64px;
}
header h1 { margin: 0 0 6px; font-size: 22px; }
header p  { margin: 0 0 8px; }
header .intro-extra { margin-bottom: 28px; }
section {
  margin-bottom: 28px;
  padding: var(--pad);
  border: 1px solid var(--line);
  border-radius: 10px;
}
section h2 { margin: 0 0 8px; font-size: 15px; font-weight: 600; }
section h2 + .small { margin-top: 0; margin-bottom: 14px; }
.muted { color: var(--muted); }
.small { font-size: 12.5px; }
code, pre {
  font: 12px/1.5 "SF Mono", Menlo, Consolas, monospace;
  background: var(--code-bg);
  border-radius: 4px;
}
code { padding: 1px 4px; }
pre  {
  padding: 10px;
  white-space: pre-wrap;
  overflow-x: auto;
  margin: 12px 0 0;
}
.placeholder { color: var(--muted); font-style: italic; }
.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px 16px;
}
.grid .full { grid-column: 1 / -1; }
label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 12px;
  color: var(--muted);
}
input, select, textarea, button {
  font: 13px/1.4 inherit;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--fg);
  padding: 8px 10px;
  border-radius: 6px;
}
textarea { resize: vertical; font-family: "SF Mono", Menlo, Consolas, monospace; }
button {
  margin-top: 4px;
  background: var(--accent);
  color: white;
  border: none;
  cursor: pointer;
  padding: 8px 16px;
}
button:hover { filter: brightness(1.05); }
#verify-btn { margin-top: 12px; }

/* Tabs */
.tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.tab {
  background: var(--tab-bg);
  color: var(--fg);
  border: 1px solid var(--line);
  font-size: 12.5px;
  padding: 6px 12px;
  cursor: pointer;
  margin-top: 0;
}
.tab-active {
  background: var(--tab-active-bg);
  border-color: var(--accent);
  color: var(--accent);
}
.tab-secondary {
  margin-left: auto;
  background: transparent;
  color: var(--muted);
  border-style: dashed;
}
.tab-secondary:hover { color: var(--fg); border-color: var(--fg); }
.tab-panel { display: none; }
.tab-panel-active { display: block; }

.row-ok  { color: var(--ok); }
.row-err { color: var(--err); }
footer { margin-top: 24px; font-size: 12px; }
footer a { color: var(--accent); text-decoration: none; margin-right: 4px; }
footer a:hover { text-decoration: underline; }
[data-domain] { display: none; }

.row-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 6px;
}
.row-actions .tab-secondary { margin-left: 0; }
input[readonly] {
  background: var(--code-bg);
  color: var(--muted);
  font-family: "SF Mono", Menlo, Consolas, monospace;
}
#kp-signature { font-family: "SF Mono", Menlo, Consolas, monospace; font-size: 12px; }

@media (max-width: 540px) {
  .grid { grid-template-columns: 1fr; }
  .tabs { gap: 4px; }
  .tab-secondary { margin-left: 0; flex-basis: 100%; }
}