:root {
  --ink: #1A1A1A;
  --paper: #FAFAFA;
  --panel: #FFFFFF;
  --line: #E5E5E5;
  --muted: #6B6B6B;
  --accent: #10B981;
  --accent-d: #059669;
  --ok: #10B981;
  --bad: #B42318;
  --white: #FFFFFF;
  --sans: "IBM Plex Sans", "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  min-height: 100vh;
  font-size: 1.05rem;
  line-height: 1.6;
  font-weight: 400;
  display: flex;
  flex-direction: column;
}
.page { flex: 1 0 auto; display: flex; flex-direction: column; }
body.home .page {
  flex: 1 1 auto;
  min-height: 0;
}
.home-logo {
  flex: 1 1 auto;
  width: 100%;
  min-height: 0;
  padding: 0;
  background-color: #f3f0ea;
  background-image: url("/static/logo.png");
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
}
.home-logo img {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.prose p, .lead {
  max-width: 40rem;
  line-height: 1.65;
}
.lead { margin: 0.4rem 0 1.2rem; }
.who { font-weight: 500; }
a { color: var(--accent-d); }
.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.6rem;
  background: var(--white);
  color: var(--ink);
  border-bottom: 1px solid var(--line);
}
.brand {
  font-family: var(--mono);
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink);
  text-decoration: none;
  font-size: 1.15rem;
}
.top nav { display: flex; gap: 1rem; align-items: center; }
.top nav a, .top nav button {
  color: var(--ink);
  background: none;
  border: 0;
  font: inherit;
  cursor: pointer;
  text-decoration: none;
}
.top nav a:hover, .top nav button:hover { color: var(--accent-d); }
.wrap { max-width: 980px; margin: 0 auto; padding: 2rem 1.2rem 4rem; }
.hero {
  background: var(--paper);
  color: var(--ink);
  padding: 4.5rem 1.5rem 2.5rem;
}
h1, h2, h3 { font-family: var(--mono); font-weight: 600; color: var(--ink); letter-spacing: -0.02em; }
h1 { font-size: clamp(1.55rem, 3vw, 2rem); line-height: 1.25; margin: 0 0 0.75rem; }
h2 { font-size: 1.15rem; margin: 1.6rem 0 0.6rem; }
.card p { line-height: 1.55; margin: 0; }
.hero h1 {
  font-family: var(--mono);
  font-weight: 600;
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.15;
  max-width: 18ch;
  margin: 0 0 1rem;
}
.hero p, .hero .lead { max-width: 42rem; color: var(--muted); font-size: 1.18rem; line-height: 1.6; }
.hero-actions { margin-top: 1.8rem; display: flex; gap: 0.8rem; flex-wrap: wrap; }
.btn {
  display: inline-block;
  background: var(--accent);
  color: #FFFFFF;
  text-decoration: none;
  border: 0;
  padding: 0.7rem 1.15rem;
  font: inherit;
  cursor: pointer;
  border-radius: 2px;
}
.btn:hover { background: var(--accent-d); }
.btn.ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
}
.btn.ghost:hover { border-color: var(--accent); color: var(--accent-d); }
.btn.danger { color: var(--bad); border-color: var(--line); }
.btn.danger:hover { border-color: var(--bad); color: var(--bad); background: #FEF3F2; }
.btn.ghost.light { color: var(--ink); border-color: var(--line); }
.grid3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; margin-top: 2rem; }
.card {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 1.1rem 1.2rem;
}
.card h3 { font-family: var(--mono); margin: 0 0 0.4rem; }
.limits { max-width: 42rem; margin: 1.2rem 0 1.6rem; }
.limits ul { margin: 0.4rem 0 0.6rem; padding-left: 1.2rem; }
.limits li { margin: 0.35rem 0; }
table, .facts, .steps, code, kbd { font-family: var(--mono); }
.muted { color: var(--muted); line-height: 1.55; }
select {
  width: 100%;
  max-width: 32rem;
  padding: 0.55rem 0.65rem;
  font: inherit;
  font-family: var(--mono);
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--ink);
}
.form { max-width: 420px; }
label { display: block; margin: 0.9rem 0 0.3rem; font-weight: 600; }
input[type=text], input[type=email], input[type=password], input[type=file] {
  width: 100%;
  padding: 0.55rem 0.65rem;
  font: inherit;
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--ink);
}
.pw-row { display: flex; gap: 0.4rem; align-items: stretch; }
.pw-row input { flex: 1; min-width: 0; }
.pw-toggle {
  flex: 0 0 auto;
  background: var(--white);
  border: 1px solid var(--line);
  color: var(--ink);
  font: inherit;
  cursor: pointer;
  padding: 0.45rem 0.7rem;
}
.pw-toggle:hover { background: var(--paper); color: var(--accent-d); }
.error {
  background: #FEF3F2;
  color: var(--bad);
  border: 1px solid var(--line);
  padding: 0.7rem 0.9rem;
  margin: 0.8rem 0;
}
.ok {
  background: #ECFDF5;
  color: var(--accent-d);
  border: 1px solid var(--line);
  padding: 0.7rem 0.9rem;
}
.steps {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 1rem 0 1.4rem;
}
.steps a {
  text-decoration: none;
  color: var(--muted);
  border: 1px solid var(--line);
  padding: 0.25rem 0.55rem;
  font-size: 0.85rem;
  background: var(--white);
}
.steps a.on { background: var(--accent); color: #FFFFFF; border-color: var(--accent); }
.steps.sticky {
  position: sticky;
  top: 0;
  z-index: 3;
  background: var(--paper);
  padding: 0.65rem 0 0.75rem;
}
.step-block {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 1.2rem 1.3rem 0.8rem;
  margin: 1.4rem 0;
}
.step-block h2 {
  font-size: 1.2rem;
  margin: 0 0 0.35rem;
}
.step-block h3 {
  font-size: 1.02rem;
  margin: 1.1rem 0 0.35rem;
}
.choice-cols { column-count: 2; column-gap: 1.2rem; }
@media (min-width: 900px) {
  .choice-cols { column-count: 3; }
}
.choice-cols .choice { break-inside: avoid; }
.sticky-actions {
  position: sticky;
  bottom: 0;
  background: var(--paper);
  padding: 0.9rem 0 0.4rem;
  border-top: 1px solid var(--line);
  z-index: 3;
}
.group { margin: 1.6rem 0 1.8rem; }
.group h2 { font-size: 1.12rem; margin: 0 0 0.35rem; }
.choice {
  display: flex;
  gap: 0.7rem;
  align-items: flex-start;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--line);
}
.choice input { margin-top: 0.35rem; flex-shrink: 0; }
.opt-text {
  font-weight: 400;
  line-height: 1.5;
}
.opt-text strong { font-weight: 600; }
.hint {
  color: var(--muted);
  font-weight: 400;
  font-size: 0.95em;
}
.actions { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1.4rem; }
table { width: 100%; border-collapse: collapse; background: var(--white); }
th, td { border: 1px solid var(--line); padding: 0.45rem 0.55rem; text-align: left; font-size: 0.95rem; }
th { background: var(--paper); }
.facts { display: flex; gap: 1.2rem; flex-wrap: wrap; margin: 0.6rem 0 1rem; }
.facts span { background: var(--white); border: 1px solid var(--line); padding: 0.35rem 0.6rem; }
footer.site {
  flex-shrink: 0;
  border-top: 1px solid var(--line);
  background: var(--white);
  color: var(--muted);
  padding: 1.8rem 1.4rem 2.1rem;
  text-align: center;
}
.foot-inner {
  max-width: 36rem;
  margin: 0 auto;
}
.foot-brand,
.foot-copy,
.foot-mail,
.foot-legal {
  margin: 0;
}
.foot-brand {
  font-family: var(--mono);
  font-size: 0.95rem;
  color: var(--ink);
  letter-spacing: 0.02em;
  margin-bottom: 0.35rem;
}
.foot-name { font-weight: 600; }
.foot-sep {
  margin: 0 0.45rem;
  color: var(--line);
  font-weight: 400;
}
.foot-ver {
  font-weight: 400;
  color: var(--muted);
}
.foot-copy {
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 0.85rem;
}
.foot-mail {
  font-family: var(--mono);
  font-size: 0.92rem;
  margin-bottom: 1rem;
}
.foot-mail a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.08rem;
}
.foot-mail a:hover {
  color: var(--accent-d);
  border-bottom-color: var(--accent);
}
.foot-legal {
  font-size: 0.84rem;
  line-height: 1.55;
  color: var(--muted);
}
.foot-legal a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}
.foot-legal a:hover {
  color: var(--accent-d);
  border-bottom-color: var(--accent);
}
.legal h2 { margin-top: 1.6rem; }
.legal p, .legal ul { max-width: 40rem; }
.legal ul { padding-left: 1.2rem; }
.legal li { margin: 0.35rem 0; }
.fig-cap { margin: 1.4rem 0 0.4rem; }
.warn {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 0.7rem 0.9rem;
  margin: 0.8rem 0;
}
img.fig { max-width: 100%; height: auto; border: 1px solid var(--line); background: var(--white); }
.leitura { margin: 1rem 0 1.2rem; max-width: 42rem; }
.leitura h2, .leitura h3 { margin-top: 0; }
.leitura-texto {
  white-space: pre-wrap;
  line-height: 1.65;
  margin: 0.5rem 0 0;
}
.bloco-estudo { margin: 2rem 0 2.4rem; }
.bloco-estudo h2 { margin-bottom: 0.6rem; }
.final-ia { border-top: 1px solid var(--line); padding-top: 1.4rem; }