:root {
  --gt-gold: #B3A369;
  --gt-gold-deep: #857437;
  --gt-navy: #003057;
  --gt-navy-ink: #001A33;
  --paper: #FAF7EF;
  --paper-2: #F2ECDC;
  --rule: #D9D1B7;
  --text: #1A1A1A;
  --muted: #4A4A4A;
  --warn: #9E2A2B;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--text);
  font-family: "Source Serif 4", Georgia, "Times New Roman", serif;
  font-size: 17px;
  line-height: 1.55;
}

.gold-bar {
  height: 6px;
  background: var(--gt-gold);
}

header {
  max-width: 980px;
  margin: 0 auto;
  padding: 40px 28px 28px;
  border-bottom: 1px solid var(--rule);
}

.wordmark {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}
.wordmark .gt {
  font-family: "Oswald", sans-serif;
  font-weight: 700;
  background: var(--gt-navy);
  color: var(--gt-gold);
  padding: 3px 10px 2px;
  font-size: 18px;
  letter-spacing: 0.04em;
  border-radius: 2px;
}
.wordmark .course {
  font-family: "Oswald", sans-serif;
  text-transform: uppercase;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--gt-navy);
}

header h1 {
  font-family: "Oswald", sans-serif;
  font-weight: 600;
  color: var(--gt-navy);
  font-size: 40px;
  line-height: 1.12;
  margin: 0 0 14px;
  letter-spacing: 0.005em;
  max-width: 22ch;
}

.lede {
  font-size: 18px;
  color: var(--text);
  margin: 0;
  max-width: 62ch;
}
.lede em { font-style: italic; }

main {
  max-width: 980px;
  margin: 0 auto;
  padding: 28px 28px 40px;
  display: block;
}

.panel {
  background: #FFFFFF;
  border: 1px solid var(--rule);
  border-left: 3px solid var(--gt-gold);
  border-radius: 2px;
  padding: 26px 28px;
  margin-bottom: 28px;
  box-shadow: 0 1px 0 rgba(0, 48, 87, 0.04);
}

.panel h2 {
  font-family: "Oswald", sans-serif;
  color: var(--gt-navy);
  font-size: 22px;
  font-weight: 600;
  margin: 0 0 6px;
  letter-spacing: 0.01em;
}
.panel-sub {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 15px;
  font-style: italic;
}

.grid-2 {
  background: transparent;
  border: none;
  padding: 0;
  margin-bottom: 28px;
  box-shadow: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.grid-2 > div {
  background: #FFFFFF;
  border: 1px solid var(--rule);
  border-left: 3px solid var(--gt-gold);
  border-radius: 2px;
  padding: 22px 22px 24px;
}
.grid-2 h2 { font-size: 19px; }

form {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: end;
}

label {
  display: flex;
  flex-direction: column;
  gap: 5px;
  font-family: "Oswald", sans-serif;
  font-size: 12px;
  color: var(--gt-navy);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

select, input {
  background: #FFFFFF;
  color: var(--text);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 9px 10px;
  font-size: 15px;
  font-family: inherit;
  min-width: 180px;
}
select:focus, input:focus {
  outline: 2px solid var(--gt-gold);
  outline-offset: 1px;
  border-color: var(--gt-gold);
}

button {
  background: var(--gt-navy);
  color: #FFFFFF;
  border: 0;
  padding: 10px 18px;
  border-radius: 2px;
  font-family: "Oswald", sans-serif;
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
  cursor: pointer;
  transition: background 120ms ease;
}
button:hover { background: var(--gt-navy-ink); }
button:disabled { background: #8A8A8A; cursor: not-allowed; }

.result {
  margin-top: 18px;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 14px 18px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 13.5px;
  line-height: 1.7;
  white-space: pre-wrap;
  min-height: 24px;
  color: var(--gt-navy-ink);
}

.chart { width: 100%; height: 380px; }

/* Methodology */

.methodology p { margin: 10px 0 14px; }
.methodology h3 {
  font-family: "Oswald", sans-serif;
  color: var(--gt-navy);
  font-size: 17px;
  font-weight: 600;
  margin: 26px 0 8px;
  letter-spacing: 0.02em;
  border-bottom: 1px dashed var(--gt-gold);
  padding-bottom: 4px;
  display: inline-block;
  padding-right: 10px;
}

.eq {
  background: var(--paper-2);
  border-left: 3px solid var(--gt-gold-deep);
  padding: 14px 18px;
  margin: 10px 0 14px;
  font-family: "Source Serif 4", "Cambria Math", Georgia, serif;
  font-size: 18px;
  overflow-x: auto;
}
.eq.big { font-size: 20px; padding: 18px 20px; }
.eq i { font-style: italic; }
.eq sub { font-size: 0.75em; }
.eq sup { font-size: 0.8em; }

code {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  padding: 1px 6px;
  border-radius: 2px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.88em;
}

.table-wrap { overflow-x: auto; }
#fits-table {
  width: 100%;
  border-collapse: collapse;
  margin: 8px 0 6px;
  font-size: 15px;
}
#fits-table th, #fits-table td {
  text-align: left;
  padding: 8px 14px 8px 0;
  border-bottom: 1px solid var(--rule);
}
#fits-table thead th {
  font-family: "Oswald", sans-serif;
  color: var(--gt-navy);
  font-weight: 600;
  letter-spacing: 0.06em;
  border-bottom: 2px solid var(--gt-gold);
  text-transform: uppercase;
  font-size: 13px;
}
#fits-table tbody td:first-child {
  font-family: "Oswald", sans-serif;
  color: var(--gt-navy);
  letter-spacing: 0.02em;
}
#fits-table tbody td {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 13.5px;
}

.caveats {
  margin: 8px 0 4px;
  padding-left: 22px;
}
.caveats li { margin-bottom: 8px; }
.caveats em { color: var(--warn); font-style: italic; }

footer {
  border-top: 6px solid var(--gt-gold);
  background: var(--gt-navy);
  color: #EEEDE4;
}
.footer-inner {
  max-width: 980px;
  margin: 0 auto;
  padding: 20px 28px;
  display: flex;
  justify-content: space-between;
  gap: 14px;
  font-size: 13px;
  font-family: "Oswald", sans-serif;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
footer code {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.14);
  color: var(--gt-gold);
  font-family: "SF Mono", Menlo, Consolas, monospace;
  letter-spacing: 0;
  text-transform: none;
}

@media (max-width: 860px) {
  header h1 { font-size: 30px; }
  .grid-2 { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; }
  .eq { font-size: 16px; }
  .eq.big { font-size: 17px; }
}