:root {
  --ink: #16212e;
  --muted: #5b6b7c;
  --rule: #d8dee6;
  --accent: #1e3a5f;
  --mark: #a8781a;
  --paper: #ffffff;
  --ground: #eef1f5;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  font-size: 17px;
  line-height: 1.7;
}
.sheet {
  max-width: 780px;
  margin: 0 auto;
  background: var(--paper);
  min-height: 100vh;
  padding: 40px 56px 72px;
  border-left: 1px solid var(--rule);
  border-right: 1px solid var(--rule);
}
nav.top {
  display: flex;
  gap: 22px;
  align-items: baseline;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 40px;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 12.5px;
  letter-spacing: 0.04em;
}
nav.top a { color: var(--muted); text-decoration: none; }
nav.top a:hover, nav.top a[aria-current] { color: var(--accent); }
nav.top .brand { font-weight: 600; color: var(--ink); margin-right: auto; letter-spacing: 0.12em; }
h1 { font-size: 30px; line-height: 1.15; margin: 0 0 6px; letter-spacing: -0.01em; }
h2 { font-size: 21px; margin: 40px 0 10px; padding-top: 18px; border-top: 1px solid var(--rule); }
h3 { font-size: 16px; margin: 24px 0 6px; font-family: system-ui, sans-serif; }
p { margin: 0 0 14px; }
.lead { font-size: 19px; color: var(--muted); margin-bottom: 28px; }
.hero { display: flex; gap: 32px; align-items: flex-start; }
.hero img { width: 190px; height: auto; flex: 0 0 auto; }
blockquote {
  margin: 24px 0; padding: 18px 24px;
  border-left: 3px solid var(--mark); background: #faf7f0;
  font-size: 18px;
}
blockquote p:last-child { margin: 0; }
a { color: var(--accent); text-underline-offset: 2px; }
.cta {
  display: inline-block; margin-top: 12px; padding: 12px 26px;
  background: var(--accent); color: #fff; text-decoration: none;
  font-family: system-ui, sans-serif; font-size: 15px; letter-spacing: 0.02em;
}
.cta:hover { background: #17304e; }
.note { color: var(--muted); font-size: 15px; }

/* --- генератор --- */
fieldset { border: 1px solid var(--rule); margin: 0 0 20px; padding: 16px 20px 18px; }
legend { font-family: system-ui, sans-serif; font-size: 13px; font-weight: 600;
         letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent); padding: 0 6px; }
.opt { display: block; padding: 5px 0; font-size: 16px; cursor: pointer; }
.opt input { margin-right: 9px; }
.opt .hint { display: block; margin-left: 26px; color: var(--muted); font-size: 14px; }
.sub { margin: 6px 0 4px 26px; padding-left: 14px; border-left: 2px solid var(--rule); }
.sub[hidden] { display: none; }
.text { margin: 0 0 8px 26px; }
.text summary { font-family: system-ui, sans-serif; font-size: 13px; color: var(--muted);
                cursor: pointer; padding: 2px 0; }
.text summary:hover { color: var(--accent); }
.text .body { margin: 6px 0 10px; padding: 2px 0 2px 14px; border-left: 2px solid var(--rule);
              font-size: 15.5px; }
.text .body p { margin: 6px 0; }
.text .body h3 { margin: 10px 0 4px; }
.text .body ul { margin: 6px 0; padding-left: 20px; }

.fields { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 18px; }
.fields label { font-family: system-ui, sans-serif; font-size: 13px; color: var(--muted); }
.fields input { width: 100%; padding: 8px 10px; border: 1px solid var(--rule);
                font-family: inherit; font-size: 15px; background: #fcfdfe; }
.result { margin-top: 26px; padding: 18px 22px; border: 1px solid var(--rule); background: #f6f8fa; }
.result .code { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 13.5px; }
.result .num { font-size: 26px; font-weight: 600; }
table.faq { width: 100%; border-collapse: collapse; font-size: 15.5px; }
table.faq th, table.faq td { text-align: left; vertical-align: top; padding: 9px 12px;
                             border-bottom: 1px solid var(--rule); }
table.faq th { width: 34%; font-family: system-ui, sans-serif; font-size: 14px; }
footer.doc { margin-top: 56px; padding-top: 18px; border-top: 1px solid var(--rule);
             color: var(--muted); font-size: 13.5px; }
@media (max-width: 720px) {
  .sheet { padding: 28px 20px 56px; }
  .hero { flex-direction: column-reverse; gap: 18px; }
  .hero img { width: 130px; }
  .fields { grid-template-columns: 1fr; }
  nav.top { flex-wrap: wrap; gap: 14px; }
}

.share { display: flex; align-items: center; gap: 8px; margin-top: 14px; flex-wrap: wrap; }
.share-label { font-family: system-ui, sans-serif; font-size: 12px; letter-spacing: 0.08em;
               text-transform: uppercase; color: var(--muted); margin-right: 2px; }
.share button { width: 32px; height: 32px; padding: 6px; display: inline-flex;
                align-items: center; justify-content: center; cursor: pointer;
                color: var(--muted); background: transparent;
                border: 1px solid var(--rule); border-radius: 4px; }
.share button:hover { color: var(--accent); border-color: var(--accent); }
.share button svg { width: 100%; height: 100%; }
.share-done { font-family: system-ui, sans-serif; font-size: 12px; color: var(--mark); }