/* Dark by default; the header toggle switches to light (remembered). */
:root {
  --bg: #12161c;
  --card: #1b2129;
  --text: #e3e7ed;
  --muted: #97a2b0;
  --line: #2e3742;
  --accent: #5b9bf0;
  --accent-text: #0d1117;
  --edited: #3a3014;
  --edited-line: #c99a1a;
  --error: #f28b82;
  --error-bg: #3b1d1b;
  --warn-bg: #3a2e16;
  --selected: #1f2d42;
  color-scheme: dark;
}
:root[data-theme="light"] {
  --bg: #f5f6f8;
  --card: #ffffff;
  --text: #1c2330;
  --muted: #5f6b7a;
  --line: #dde1e7;
  --accent: #1f5fbf;
  --accent-text: #ffffff;
  --edited: #fff4d6;
  --edited-line: #d9a400;
  --error: #b42318;
  --error-bg: #fdecea;
  --warn-bg: #fff4e0;
  --selected: #e8f0fc;
  color-scheme: light;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
h1 { font-size: 1.25rem; margin: 0; }
h2 { font-size: 1rem; margin: 0 0 .75rem; }
small { color: var(--muted); font-weight: normal; }
[hidden] { display: none !important; }

.topbar {
  display: flex; flex-wrap: wrap; gap: .75rem 2rem; align-items: center; justify-content: space-between;
  padding: 1rem 1.5rem; background: var(--card); border-bottom: 1px solid var(--line);
}
.trade-date { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; }
.trade-date label { font-weight: 600; }

.layout {
  display: grid; gap: 1.25rem; padding: 1.25rem 1.5rem 2rem;
  grid-template-columns: minmax(320px, 1fr) minmax(320px, 1fr);
  max-width: 1200px; margin: 0 auto;
}
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 1.1rem 1.25rem; min-width: 0; }
.wide { grid-column: 1 / -1; }
@media (max-width: 760px) {
  .layout { grid-template-columns: 1fr; padding: 1rem; }
  .topbar { padding: 1rem; }
}

.fields { display: grid; grid-template-columns: 7rem 1fr; gap: .8rem 1rem; align-items: start; margin-bottom: 1.25rem; }
.fields > label, .fields > .label { padding-top: .45rem; font-weight: 600; }

input, select, button { font: inherit; color: inherit; }
input, select {
  background: var(--card); border: 1px solid var(--line); border-radius: 6px; padding: .4rem .55rem;
  max-width: 100%;
}
input:focus, select:focus, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
[aria-invalid="true"] { border-color: var(--error); background: var(--error-bg); }
.field-error { display: block; color: var(--error); font-size: .85rem; margin-top: .2rem; }

.segmented { display: inline-flex; flex-wrap: wrap; gap: .25rem 1rem; margin-bottom: .4rem; padding-top: .4rem; }
.segmented label { display: inline-flex; gap: .35rem; align-items: center; cursor: pointer; }
.maturity-input + .maturity-input { margin-top: .4rem; }
.with-unit { display: inline-flex; align-items: center; gap: .4rem; }
.with-unit input { width: 9rem; }
.unit { color: var(--muted); }
.implied { margin: .3rem 0 0; color: var(--muted); font-size: .88rem; }
#tenor { min-width: 12rem; }

.theme-toggle .to-dark { display: none; }
:root[data-theme="light"] .theme-toggle .to-dark { display: inline; }
:root[data-theme="light"] .theme-toggle .to-light { display: none; }

button { border-radius: 6px; padding: .45rem .9rem; cursor: pointer; border: 1px solid var(--line); background: var(--card); }
button.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); font-weight: 600; padding: .6rem 1.4rem; }
button.secondary:hover { border-color: var(--accent); }

.banner { margin: 1rem auto 0; max-width: calc(1200px - 3rem); padding: .7rem 1rem; border-radius: 8px; }
.banner.error { background: var(--error-bg); color: var(--error); border: 1px solid var(--error); }
.banner.warn { background: var(--warn-bg); margin: 0; }
@media (max-width: 1248px) { .banner { margin: 1rem 1.5rem 0; } }
@media (max-width: 760px) { .banner { margin: 1rem 1rem 0; } }

.hint, .meta { color: var(--muted); font-size: .88rem; margin: 0 0 .75rem; }
.meta strong { color: var(--text); }

table { border-collapse: collapse; width: 100%; font-variant-numeric: tabular-nums; }
th, td { padding: .3rem .5rem; border-bottom: 1px solid var(--line); text-align: left; white-space: nowrap; }
th { font-size: .85rem; color: var(--muted); font-weight: 600; }
.num { text-align: right; }
.rates input { width: 7.5rem; text-align: right; font-variant-numeric: tabular-nums; }
.rates .markit { color: var(--muted); }
.rates tr.edited td { background: var(--edited); }
.rates tr.edited input { border-color: var(--edited-line); }
.panel-actions { display: flex; justify-content: space-between; align-items: center; margin-top: .75rem; }
.edit-count { color: var(--muted); font-size: .88rem; }

.scroll { overflow-x: auto; }
.overview th small { display: block; }
.overview .selected { background: var(--selected); }
.pick { border: 0; background: none; padding: 0; color: var(--accent); font-weight: 700; text-decoration: underline; }
.unavailable { color: var(--muted); font-size: .88rem; padding-left: 1.1rem; }

.result { margin-top: 1rem; }
.boxes { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: .4rem; margin: 0 0 .5rem; }
.boxes > div { border: 1px solid var(--line); border-radius: 4px; padding: .35rem .5rem; }
.boxes dt { color: var(--muted); font-size: .78rem; }
.boxes dd { margin: 0; font-variant-numeric: tabular-nums; }
.sub { font-size: .85rem; margin: .75rem 0 .4rem; color: var(--muted); font-weight: 600; }
.boxes > .pnl { border-color: var(--accent); }
.rolled { color: var(--muted); font-size: .85rem; }

/* Header nav and the about page */
.nav { display: flex; gap: .25rem; }
.nav a { color: var(--muted); text-decoration: none; padding: .3rem .6rem; border-radius: 6px; }
.nav a:hover { color: var(--text); }
.nav a[aria-current="page"] { color: var(--text); background: var(--selected); }
.spacer { flex: 1; }
.page { max-width: 820px; margin: 0 auto; padding: 1.25rem 1.5rem 2rem; }
@media (max-width: 760px) { .page { padding: 1rem; } }
.about p { margin: 0 0 .9rem; }
.site-footer { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem 2rem; color: var(--muted); font-size: .8rem; }
.site-footer p { margin: 0; }