:root {
  --bg: #0f1419;
  --surface: #1a2029;
  --surface-2: #232b36;
  --border: #2f3947;
  --text: #e6e9ee;
  --muted: #97a3b4;
  --accent: #4f8cff;
  --accent-hover: #6ea0ff;
  --ok: #36c08a;
  --warn: #e0a23b;
  --err: #e5604d;
  --radius: 10px;
  --maxw: 860px;
  font-size: 16px;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f8fa; --surface: #ffffff; --surface-2: #eef1f5; --border: #d7dde5;
    --text: #1a2029; --muted: #5b6675; --accent: #2f6fe0; --accent-hover: #1d59c4;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
header.site {
  border-bottom: 1px solid var(--border); background: var(--surface);
  position: sticky; top: 0; z-index: 10;
}
header.site .wrap { display: flex; align-items: center; justify-content: space-between; height: 56px; }
.logo { font-weight: 700; font-size: 1.15rem; color: var(--text); }
.logo span { color: var(--accent); }
nav.top a { color: var(--muted); margin-left: 18px; font-size: .92rem; }
nav.top a:hover { color: var(--text); text-decoration: none; }
main { padding: 32px 0 56px; }
h1 { font-size: 1.7rem; line-height: 1.25; margin: 0 0 8px; }
h2 { font-size: 1.25rem; margin: 36px 0 12px; }
h3 { font-size: 1.05rem; margin: 24px 0 8px; }
.lede { color: var(--muted); font-size: 1.05rem; margin: 0 0 24px; }
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px; margin: 16px 0;
}
label { display: block; font-size: .85rem; color: var(--muted); margin: 0 0 6px; font-weight: 600; }
input[type=text], input[type=number], textarea, select {
  width: 100%; background: var(--surface-2); color: var(--text);
  border: 1px solid var(--border); border-radius: 8px; padding: 11px 12px;
  font-size: .98rem; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
textarea { resize: vertical; min-height: 110px; line-height: 1.5; }
input:focus, textarea:focus, select:focus { outline: 2px solid var(--accent); border-color: var(--accent); }
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: flex-end; }
.row > * { flex: 1 1 160px; }
.btn {
  display: inline-flex; align-items: center; gap: 6px; cursor: pointer;
  background: var(--accent); color: #fff; border: none; border-radius: 8px;
  padding: 11px 16px; font-size: .95rem; font-weight: 600; white-space: nowrap;
}
.btn:hover { background: var(--accent-hover); }
.btn.secondary { background: var(--surface-2); color: var(--text); border: 1px solid var(--border); }
.btn.secondary:hover { background: var(--border); }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 14px; }
.out {
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px;
  padding: 12px 14px; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .95rem; word-break: break-all; white-space: pre-wrap; min-height: 20px;
}
.kv { display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; align-items: baseline; }
.kv dt { color: var(--muted); font-size: .85rem; font-weight: 600; }
.kv dd { margin: 0; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; word-break: break-all; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.ok { color: var(--ok); } .warn { color: var(--warn); } .err { color: var(--err); }
.pill { display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: .78rem; font-weight: 600; }
.pill.ok { background: rgba(54,192,138,.15); color: var(--ok); }
.pill.err { background: rgba(229,96,77,.15); color: var(--err); }
.privacy {
  display: flex; align-items: center; gap: 8px; font-size: .85rem; color: var(--muted);
  background: var(--surface); border: 1px dashed var(--border); border-radius: 8px;
  padding: 9px 12px; margin: 0 0 20px;
}
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; margin: 20px 0; }
.tool-grid a {
  display: block; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px; color: var(--text); text-decoration: none;
}
.tool-grid a:hover { border-color: var(--accent); text-decoration: none; }
.tool-grid h3 { margin: 0 0 4px; font-size: 1rem; }
.tool-grid p { margin: 0; color: var(--muted); font-size: .88rem; }
.prose p, .prose li { color: var(--text); }
.prose { margin-top: 8px; }
.faq dt { font-weight: 600; margin-top: 16px; }
.faq dd { margin: 4px 0 0; color: var(--muted); }
footer.site { border-top: 1px solid var(--border); color: var(--muted); font-size: .85rem; padding: 24px 0; }
footer.site a { color: var(--muted); }
.copied { color: var(--ok); font-size: .82rem; margin-left: 8px; opacity: 0; transition: opacity .2s; }
.copied.show { opacity: 1; }
code { background: var(--surface-2); padding: 1px 6px; border-radius: 5px; font-size: .9em; }
@media (max-width: 560px) { h1 { font-size: 1.4rem; } nav.top a { margin-left: 12px; } }