:root {
  --bg: #f7f8fa;
  --card: #ffffff;
  --text: #1c2430;
  --muted: #5b6675;
  --border: #dfe3e8;
  --accent: #0b7a5c;
  --accent-soft: #e6f4ef;
  --erro: #b42318;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161c;
    --card: #1b2028;
    --text: #e6e9ee;
    --muted: #9aa4b2;
    --border: #2c333d;
    --accent: #3fc79a;
    --accent-soft: #1d3a31;
    --erro: #ff8a80;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}
a { color: var(--accent); }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 16px; }
header.top { border-bottom: 1px solid var(--border); background: var(--card); }
header.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-top: 12px; padding-bottom: 12px; }
.logo { font-weight: 700; font-size: 1.15rem; text-decoration: none; color: var(--text); }
.logo span { color: var(--accent); }
header.top nav a { font-size: .95rem; text-decoration: none; }
main { padding: 24px 0 48px; }
h1 { font-size: 1.7rem; line-height: 1.25; margin: .2em 0 .4em; }
h2 { font-size: 1.25rem; margin-top: 1.8em; }
.lead { color: var(--muted); margin-top: 0; }
.crumbs { font-size: .85rem; color: var(--muted); }
.crumbs a { color: var(--muted); }

.calc {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
  margin: 18px 0;
}
.calc h3 { margin: 0 0 12px; font-size: 1.05rem; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; }
label { display: block; font-size: .9rem; color: var(--muted); margin-bottom: 4px; }
input, select {
  width: 100%;
  font: inherit;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
}
input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
button {
  margin-top: 14px;
  font: inherit;
  font-weight: 600;
  padding: 11px 22px;
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}
@media (prefers-color-scheme: dark) { button { color: #0d1a15; } }
.res {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: 8px;
  background: var(--accent-soft);
}
.res p { margin: .3em 0; }
.res .big { font-size: 1.5rem; font-weight: 700; }
.erro { color: var(--erro); font-weight: 600; }
table { width: 100%; border-collapse: collapse; font-size: .9rem; margin-top: 10px; }
th, td { padding: 6px 8px; border-bottom: 1px solid var(--border); text-align: right; }
th:first-child, td:first-child { text-align: left; }
.tbl { overflow-x: auto; }
details summary { cursor: pointer; margin-top: 10px; font-weight: 600; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 12px; padding: 0; list-style: none; }
.cards a {
  display: block;
  height: 100%;
  padding: 14px 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  text-decoration: none;
  color: var(--text);
}
.cards a:hover { border-color: var(--accent); }
.cards strong { display: block; color: var(--accent); }
.cards small { color: var(--muted); }

.faq h3 { font-size: 1rem; margin-bottom: .2em; }
.faq p { margin-top: 0; }
footer { border-top: 1px solid var(--border); padding: 20px 0 32px; font-size: .85rem; color: var(--muted); }
footer a { color: var(--muted); margin-right: 14px; }