:root {
  --ink: #18212f;
  --muted: #5f6b7a;
  --line: #d8dde4;
  --paper: #fbfaf7;
  --panel: #ffffff;
  --accent: #b42318;
  --accent-soft: #fff1ed;
  --green: #176b5d;
  --gold: #8c6f21;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.7;
}

a {
  color: inherit;
  text-decoration: none;
}

.topbar {
  align-items: center;
  background: #fff;
  border-bottom: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 14px max(20px, calc((100vw - 1120px) / 2));
}

.brand {
  align-items: center;
  display: flex;
  gap: 10px;
  font-weight: 800;
}

.brand span {
  font-size: 1.05rem;
}

.top-date {
  align-items: end;
  display: flex;
  flex-direction: column;
  font-size: 0.9rem;
}

.top-date span {
  color: var(--muted);
}

.site-nav {
  background: #fff;
  border-bottom: 1px solid var(--line);
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 10px max(20px, calc((100vw - 1120px) / 2));
}

.site-nav a {
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--muted);
  flex: 0 0 auto;
  font-size: 0.9rem;
  padding: 7px 10px;
}

.site-nav a[aria-current="page"],
.site-nav a:hover {
  background: var(--accent-soft);
  border-color: #f1b7ad;
  color: var(--accent);
}

main {
  margin: 0 auto;
  max-width: 1120px;
  padding: 30px 20px 56px;
}

.hero {
  display: grid;
  gap: 14px;
  margin: 0 0 22px;
}

.eyebrow,
.keyword-pill {
  color: var(--accent);
  font-size: 0.86rem;
  font-weight: 800;
  margin: 0;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  font-size: clamp(2rem, 5vw, 4.5rem);
  letter-spacing: 0;
  line-height: 1.1;
  margin-bottom: 0;
}

h2 {
  font-size: 1.35rem;
  letter-spacing: 0;
  line-height: 1.3;
  margin-bottom: 10px;
}

.hero p {
  color: var(--muted);
  font-size: 1.05rem;
  margin-bottom: 0;
  max-width: 760px;
}

.answer-strip {
  align-items: center;
  background: var(--ink);
  border-radius: 8px;
  color: #fff;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
  margin-top: 8px;
  padding: 14px 16px;
}

.answer-strip span {
  color: #cbd5df;
}

.answer-strip strong {
  font-size: 1.35rem;
}

.tool-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.single-tool {
  max-width: 760px;
}

.tool-panel,
.table-section,
.assumptions,
.content-section,
.internal-links,
.faq {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  margin-top: 16px;
  padding: 18px;
}

.tool-panel {
  display: grid;
  gap: 14px;
}

.tool-panel h2,
.section-head h2 {
  margin-bottom: 0;
}

.form-row {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0, 1fr)) auto;
}

.form-row.compact {
  grid-template-columns: minmax(120px, 1fr) minmax(100px, 1fr) auto;
}

label {
  color: var(--muted);
  display: grid;
  font-size: 0.9rem;
  gap: 5px;
}

input,
select,
button {
  border-radius: 8px;
  font: inherit;
  min-height: 44px;
}

input,
select {
  background: #fff;
  border: 1px solid var(--line);
  color: var(--ink);
  padding: 8px 10px;
  width: 100%;
}

button {
  align-self: end;
  background: var(--accent);
  border: 1px solid var(--accent);
  color: #fff;
  cursor: pointer;
  font-weight: 800;
  padding: 8px 14px;
}

button:hover {
  background: #931c12;
}

.result-box {
  background: #f8fafc;
  border: 1px solid var(--line);
  border-radius: 8px;
  display: grid;
  gap: 8px;
  min-height: 78px;
  padding: 12px;
}

.result-box div {
  align-items: baseline;
  display: flex;
  gap: 12px;
  justify-content: space-between;
}

.result-box span {
  color: var(--muted);
  font-size: 0.9rem;
}

.result-box strong {
  text-align: right;
}

.error {
  color: var(--accent);
  font-weight: 700;
  margin: 0;
}

.assumptions {
  border-left: 5px solid var(--green);
}

.assumptions ul {
  margin: 0;
  padding-left: 20px;
}

.content-sections {
  display: grid;
  gap: 0;
}

.content-section p {
  color: var(--muted);
}

.fact-list {
  display: grid;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.fact-list li {
  border-top: 1px solid var(--line);
  display: grid;
  gap: 3px;
  padding-top: 10px;
}

.fact-list span {
  color: var(--muted);
}

.section-head {
  display: grid;
  gap: 4px;
  margin-bottom: 14px;
}

.table-wrap {
  overflow-x: auto;
}

table {
  border-collapse: collapse;
  min-width: 680px;
  width: 100%;
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 10px;
  text-align: left;
  vertical-align: top;
}

th {
  background: #f8fafc;
  color: var(--muted);
  font-size: 0.9rem;
}

.internal-links div {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.internal-links a {
  border: 1px solid var(--line);
  border-radius: 8px;
  display: grid;
  gap: 3px;
  padding: 12px;
}

.internal-links span {
  color: var(--gold);
  font-size: 0.85rem;
  font-weight: 800;
}

.internal-links strong {
  font-size: 0.96rem;
}

details {
  border-top: 1px solid var(--line);
  padding: 12px 0;
}

details:first-of-type {
  border-top: 0;
}

summary {
  cursor: pointer;
  font-weight: 800;
}

details p {
  color: var(--muted);
  margin: 8px 0 0;
}

@media (max-width: 820px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .top-date {
    align-items: flex-start;
  }

  .tool-grid,
  .form-row,
  .form-row.compact,
  .internal-links div {
    grid-template-columns: 1fr;
  }

  button {
    width: 100%;
  }

  .answer-strip {
    align-items: flex-start;
    flex-direction: column;
  }
}