:root {
  --ink: #16202b;
  --muted: #5c6b7a;
  --line: #e3e9f0;
  --bg: #f6f8fb;
  --card: #fff;
  --accent: #2f6fed;
  --accent-dark: #1d4fbf;
  --accent-soft: #eaf1ff;
  --warn: #a3561a;
  --radius: 10px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  font-size: 16px;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 920px; margin: 0 auto; padding: 0 18px; }
.site-header { background: var(--card); border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: center; gap: 16px; min-height: 56px; flex-wrap: wrap; }
.brand { font-weight: 700; font-size: 17px; color: var(--ink); }
.brand span { color: var(--accent); }
.site-nav { display: flex; gap: 14px; flex-wrap: wrap; font-size: 14px; }
.site-nav a { color: var(--muted); }
.site-nav a.is-active { color: var(--accent); font-weight: 600; }
main { padding: 26px 0 40px; }
h1 { font-size: 30px; line-height: 1.25; margin: 4px 0 8px; letter-spacing: -0.02em; }
h2 { font-size: 21px; margin: 30px 0 10px; letter-spacing: -0.01em; }
h3 { font-size: 17px; margin: 20px 0 6px; }
.lede { font-size: 17px; color: var(--muted); margin: 0 0 22px; }
.breadcrumbs { font-size: 13px; color: var(--muted); margin: 0 0 4px; }
.breadcrumbs ol { list-style: none; display: flex; gap: 6px; padding: 0; margin: 0; flex-wrap: wrap; }
.breadcrumbs li + li::before { content: "/"; margin-right: 6px; color: #b9c3ce; }

.tool {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  margin: 18px 0 8px;
  box-shadow: 0 1px 2px rgba(20, 40, 70, .04);
}
.tool textarea {
  width: 100%;
  min-height: 180px;
  resize: vertical;
  font: inherit;
  padding: 12px;
  border: 1px solid #cfd8e5;
  border-radius: 8px;
  background: #fbfcfe;
}
.tool textarea:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }
.fields { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); margin-top: 14px; }
.field label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 4px; }
.field input, .field select {
  width: 100%;
  padding: 8px 10px;
  font: inherit;
  border: 1px solid #cfd8e5;
  border-radius: 8px;
  background: #fff;
}
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 10px; margin-top: 16px; }
.stat { background: var(--accent-soft); border: 1px solid #d8e4fb; border-radius: 8px; padding: 10px 12px; }
.stat-label { display: block; font-size: 12px; color: var(--muted); }
.stat-value { font-size: 22px; font-weight: 700; font-variant-numeric: tabular-nums; color: var(--accent-dark); }
.top-words { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0 0; padding: 0; list-style: none; }
.top-words li { background: #fff; border: 1px solid #d8e4fb; border-radius: 999px; padding: 2px 10px; font-size: 13px; }
.note { font-size: 13px; color: var(--muted); margin-top: 10px; }

button, .btn {
  font: inherit;
  cursor: pointer;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  border-radius: 8px;
  padding: 8px 14px;
}
button:hover, .btn:hover { background: var(--accent-dark); }
button.secondary { background: #fff; color: var(--accent); }
button[disabled] { opacity: .5; cursor: default; }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0 6px;
  font-size: 15px;
  background: var(--card);
  border: 1px solid var(--line);
}
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: #f3f6fb; font-size: 13px; color: var(--muted); font-weight: 600; }
.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }

.callout { background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--accent); padding: 12px 14px; border-radius: 8px; margin: 16px 0; }
.callout.is-warn { border-left-color: var(--warn); background: #fff8ef; }
.callout p { margin: 0; }

details.faq { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 10px 14px; margin: 8px 0; }
details.faq summary { cursor: pointer; font-weight: 600; }
details.faq p { margin: 8px 0 0; color: #34414f; }

.related { margin: 30px 0 0; padding: 16px 18px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); }
.related h2 { margin: 0 0 8px; font-size: 16px; }
.related ul { margin: 0; padding-left: 18px; columns: 2; column-gap: 24px; }
.index { margin-top: 34px; }
.index-group { border-top: 1px solid var(--line); margin-top: 14px; padding-top: 12px; }
.index-group h3 { margin: 0 0 6px; font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.site-footer { border-top: 1px solid var(--line); background: var(--card); padding: 18px 0 26px; font-size: 13px; color: var(--muted); }
.site-footer p { margin: 4px 0; }

@media print {
  .site-header, .site-footer, .no-print, .breadcrumbs, .related { display: none !important; }
  body { background: #fff; }
  .tool, table, details.faq { box-shadow: none; }
}