:root {
  --green: #0e7c4a;
  --green-dark: #0a5c37;
  --bg: #f6f8f7;
  --card: #ffffff;
  --text: #1a2420;
  --muted: #5b6b64;
  --border: #e2e8e5;
  --accent-bg: #ecf7f1;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
.container { max-width: 760px; margin: 0 auto; padding: 0 16px; }
header.site {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
  position: sticky;
  top: 0;
  z-index: 10;
}
header.site .container { display: flex; align-items: center; justify-content: space-between; }
.brand {
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--green-dark);
  text-decoration: none;
  letter-spacing: -0.02em;
}
nav.mainnav a { color: var(--muted); text-decoration: none; font-size: 0.92rem; margin-left: 16px; }
nav.mainnav a:hover { color: var(--green); }
main { padding: 28px 0 48px; }
h1 { font-size: 1.6rem; letter-spacing: -0.02em; margin-bottom: 8px; }
.sub { color: var(--muted); margin-bottom: 24px; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  margin-bottom: 20px;
}
.card h2 { font-size: 1.1rem; margin-bottom: 14px; }
.field { margin-bottom: 14px; }
.field label { display: block; font-size: 0.88rem; font-weight: 600; margin-bottom: 5px; color: var(--text); }
.field input, .field select {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--border);
  border-radius: 9px;
  font-size: 1rem;
  background: #fff;
  color: var(--text);
}
.field input:focus, .field select:focus { outline: 2px solid var(--green); border-color: transparent; }
.field .hint { font-size: 0.78rem; color: var(--muted); margin-top: 3px; }
.results { background: var(--accent-bg); border: 1px solid #d4ebe0; }
.results .row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 9px 0;
  border-bottom: 1px dashed #cfe5da;
}
.results .row:last-child { border-bottom: none; }
.results .row .label { color: var(--muted); font-size: 0.9rem; }
.results .row .value { font-weight: 700; font-variant-numeric: tabular-nums; }
.results .row.big .value { color: var(--green-dark); font-size: 1.45rem; font-weight: 800; }
.note { font-size: 0.82rem; color: var(--muted); margin-top: 10px; }
section.info { margin-top: 8px; }
section.info h2 { font-size: 1.1rem; margin: 22px 0 8px; }
section.info p { color: var(--muted); margin-bottom: 10px; font-size: 0.95rem; }
.formula {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 0.9rem;
  overflow-x: auto;
  color: var(--green-dark);
  margin-bottom: 12px;
}
details.faq {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 13px 16px;
  margin-bottom: 10px;
}
details.faq summary { font-weight: 600; cursor: pointer; font-size: 0.95rem; }
details.faq p { color: var(--muted); font-size: 0.9rem; margin-top: 8px; }
table.yearly { width: 100%; border-collapse: collapse; font-size: 0.85rem; margin-top: 8px; }
table.yearly th, table.yearly td { padding: 7px 8px; border-bottom: 1px solid var(--border); text-align: right; font-variant-numeric: tabular-nums; }
table.yearly th { color: var(--muted); font-weight: 600; }
table.yearly td:first-child, table.yearly th:first-child { text-align: left; }
footer.site {
  border-top: 1px solid var(--border);
  background: var(--card);
  padding: 20px 0 28px;
  color: var(--muted);
  font-size: 0.85rem;
}
footer.site .links a { color: var(--muted); margin-right: 14px; text-decoration: none; }
footer.site .links a:hover { color: var(--green); }
.tools-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 20px; }
@media (max-width: 560px) { .tools-grid { grid-template-columns: 1fr; } }
.tool-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  text-decoration: none;
  color: var(--text);
  display: block;
  transition: border-color .15s;
}
.tool-card:hover { border-color: var(--green); }
.tool-card .emoji { font-size: 1.5rem; }
.tool-card .name { font-weight: 700; margin-top: 6px; }
.tool-card .desc { color: var(--muted); font-size: 0.83rem; margin-top: 3px; }
.hero { padding: 10px 0 6px; }
.hero h1 { font-size: 1.8rem; }
.badge {
  display: inline-block;
  background: var(--accent-bg);
  color: var(--green-dark);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 99px;
  margin-bottom: 10px;
}