:root {
  --paper: #F6F7F9;
  --surface: #FFFFFF;
  --ink: #0D1B2A;
  --muted: #4B5B70;
  --line: #D8DDE6;
  --orbit: #1F3FD6;
  --orbit-deep: #172FA8;
  --wash: #E9EDFB;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.6;
}

a { color: var(--orbit); text-underline-offset: 0.18em; }
a:hover { color: #172FA8; }
a:focus-visible, button:focus-visible {
  outline: 3px solid var(--orbit);
  outline-offset: 3px;
  border-radius: 4px;
}

.wrap { width: min(72rem, 100% - 2.5rem); margin-inline: auto; }

/* Cabeçalho */
.site-header { border-bottom: 1px solid var(--line); background: var(--surface); }
.site-header .wrap {
  display: flex; flex-wrap: wrap; align-items: center;
  justify-content: space-between; gap: 0.75rem 2rem; padding-block: 1rem;
}
.brand {
  display: inline-flex; align-items: center; gap: 0.6rem;
  color: var(--ink); text-decoration: none;
  font-family: var(--serif); font-size: 1.5rem; font-weight: 700; letter-spacing: -0.02em;
}
.brand svg { width: 1.9rem; height: 1.9rem; }
.site-nav { display: flex; flex-wrap: wrap; gap: 0.25rem 1.5rem; }
.site-nav a { color: var(--muted); text-decoration: none; font-size: 0.95rem; padding-block: 0.25rem; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--ink); text-decoration: underline; }

/* Faixas de conteúdo */
.hero { padding-block: clamp(2.5rem, 7vw, 5.5rem); }
.band { padding-block: clamp(2.5rem, 6vw, 4.5rem); border-top: 1px solid var(--line); }

h1, h2, h3 { font-family: var(--serif); line-height: 1.12; letter-spacing: -0.02em; margin: 0; }
h1 { font-size: clamp(2.25rem, 5.4vw, 3.9rem); max-width: 16ch; }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); margin-bottom: 1.5rem; }
h3 { font-size: 1.25rem; letter-spacing: -0.01em; }
p { margin: 0 0 1rem; }

.lede { font-size: 1.2rem; color: var(--muted); max-width: 34rem; margin-top: 1.5rem; }
.cta-row { display: flex; flex-wrap: wrap; gap: 0.75rem 1.5rem; align-items: center; margin-top: 2rem; }
.button {
  display: inline-block; background: var(--orbit); color: #fff; text-decoration: none;
  padding: 0.8rem 1.4rem; border-radius: 0.5rem; font-weight: 600;
}
.button:hover { background: #172FA8; color: #fff; }

.hero-grid { display: grid; gap: 3rem; align-items: center; }
@media (min-width: 60rem) { .hero-grid { grid-template-columns: 1.15fr 0.85fr; } }

/* Exemplo de conversa */
.chat {
  background: var(--surface); border: 1px solid var(--line); border-radius: 1.25rem;
  padding: 1.25rem; max-width: 26rem; justify-self: center; width: 100%;
}
.chat-head {
  display: flex; align-items: center; gap: 0.7rem; padding-bottom: 1rem;
  border-bottom: 1px solid var(--line); margin-bottom: 1rem;
}
.avatar {
  width: 2.4rem; height: 2.4rem; border-radius: 50%; background: var(--orbit); color: #fff;
  display: grid; place-items: center; font-family: var(--serif); font-weight: 700;
}
.chat-head strong { display: block; line-height: 1.2; }
.chat-head span { color: var(--muted); font-size: 0.875rem; }
.msg { max-width: 88%; padding: 0.65rem 0.9rem; border-radius: 1rem; margin-bottom: 0.6rem; font-size: 0.97rem; line-height: 1.45; }
.msg.in { background: var(--paper); border: 1px solid var(--line); border-top-left-radius: 0.25rem; }
.msg.out { background: var(--wash); margin-left: auto; border-top-right-radius: 0.25rem; }
.options { display: grid; gap: 0.4rem; margin: 0.15rem 0 0.9rem; max-width: 88%; }
.options span {
  border: 1px solid var(--orbit); color: var(--orbit); border-radius: 0.6rem;
  padding: 0.5rem 0.8rem; text-align: center; font-size: 0.93rem; font-weight: 600; background: var(--surface);
}
.chat-note { color: var(--muted); font-size: 0.85rem; margin: 0.9rem 0 0; }

/* Listas de definição */
.defs { margin: 0; max-width: 60rem; }
.defs > div { display: grid; gap: 0.25rem 2rem; padding-block: 1.1rem; border-top: 1px solid var(--line); }
.defs > div:last-child { border-bottom: 1px solid var(--line); }
@media (min-width: 45rem) { .defs > div { grid-template-columns: 15rem 1fr; } }
.defs dt { font-family: var(--serif); font-weight: 700; font-size: 1.15rem; }
.defs dd { margin: 0; color: var(--muted); max-width: 40rem; }
.defs dd.plain { color: var(--ink); }

.prose { max-width: 40rem; }

/* Páginas de documentos */
.doc { padding-block: clamp(2rem, 5vw, 4rem); }
.doc article { max-width: 44rem; }
.doc h1 { font-size: clamp(2rem, 4.5vw, 3rem); max-width: none; margin-bottom: 0.75rem; }
.doc h2 { font-size: 1.5rem; margin: 2.5rem 0 0.75rem; }
.doc .updated { color: var(--muted); margin-bottom: 2rem; }
.doc ul, .doc ol { padding-left: 1.25rem; margin: 0 0 1rem; }
.doc li { margin-bottom: 0.4rem; }
.doc .callout {
  background: var(--wash); border-left: 4px solid var(--orbit);
  padding: 1rem 1.25rem; border-radius: 0 0.5rem 0.5rem 0; margin: 1.5rem 0;
}
.doc .callout p:last-child { margin-bottom: 0; }

/* Rodapé */
.site-footer { background: var(--ink); color: #C9D2DF; padding-block: 2.5rem; font-size: 0.95rem; }
.site-footer a { color: #fff; }
.site-footer .wrap { display: grid; gap: 1.5rem 3rem; }
@media (min-width: 45rem) { .site-footer .wrap { grid-template-columns: 1.4fr 1fr; } }
.site-footer p { margin: 0 0 0.35rem; }
.site-footer .legal-name { color: #fff; font-weight: 600; }
.footer-links { display: flex; flex-direction: column; gap: 0.35rem; }

@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; } }