/* ==========================================================================
   DraftClock — one stylesheet, no dependencies, no webfonts, no CDN.
   Mobile-first. Dark and light via prefers-color-scheme.
   ========================================================================== */

:root {
  --bg: #ffffff;
  --bg-soft: #f5f6f8;
  --bg-sunken: #eceef2;
  --fg: #14181f;
  --fg-soft: #4a5462;
  --fg-faint: #6d7684;
  --line: #d8dce3;
  --line-strong: #b6bcc7;
  --accent: #1d4ed8;
  --accent-soft: #e6ecfd;
  --warn: #8a5a00;
  --warn-bg: #fdf3dd;
  --warn-line: #e3c477;
  --ok: #1c6b45;
  --bad: #9a2c2c;
  --demand: #6d7684;
  --chart-model: #1d4ed8;
  --chart-demand: #6d7684;
  --band: rgba(29, 78, 216, 0.16);
  --grade-a: #1c6b45;
  --grade-b: #1d4ed8;
  --grade-c: #8a5a00;
  --grade-d: #8a3a3a;
  --grade-x: #6d7684;
  --radius: 8px;
  --maxw: 68rem;
  --mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", "Consolas", "Liberation Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #10131a;
    --bg-soft: #171b24;
    --bg-sunken: #1e232e;
    --fg: #e8ebf0;
    --fg-soft: #b3bac6;
    --fg-faint: #8b93a1;
    --line: #2b323f;
    --line-strong: #3c4553;
    --accent: #7ea2ff;
    --accent-soft: #1a2340;
    --warn: #e9c477;
    --warn-bg: #2b2314;
    --warn-line: #5d4a1e;
    --ok: #6ecf9f;
    --bad: #f08b8b;
    --demand: #767e8c;
    --chart-model: #5c8df2;
    --chart-demand: #767e8c;
    --band: rgba(92, 141, 242, 0.22);
    --grade-a: #6ecf9f;
    --grade-b: #7ea2ff;
    --grade-c: #e9c477;
    --grade-d: #f08b8b;
    --grade-x: #8b93a1;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 400 16px/1.6 var(--sans);
  overflow-wrap: break-word;
}

/* ------------------------------------------------------------------ skip link */
.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 0.6rem 1rem;
  z-index: 50;
}
.skip:focus { left: 0; }

/* ------------------------------------------------------------------ banner */
.sitebanner {
  background: var(--warn-bg);
  color: var(--warn);
  border-bottom: 1px solid var(--warn-line);
  font-size: 0.85rem;
  font-weight: 600;
  text-align: center;
  padding: 0.5rem 1rem;
  letter-spacing: 0.01em;
}

/* ------------------------------------------------------------------ header/nav */
.sitehead {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 20;
}
.sitehead .inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0.7rem 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  align-items: baseline;
}
.brand {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  color: var(--fg);
  text-decoration: none;
  white-space: nowrap;
}
.brand .dot { color: var(--accent); }
nav.sitenav { flex: 1 1 100%; }
nav.sitenav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem 0.9rem;
  font-size: 0.9rem;
}
nav.sitenav a {
  color: var(--fg-soft);
  text-decoration: none;
  padding: 0.2rem 0;
  border-bottom: 2px solid transparent;
  display: inline-block;
}
nav.sitenav a:hover { color: var(--fg); }
nav.sitenav a[aria-current="page"] {
  color: var(--fg);
  font-weight: 600;
  border-bottom-color: var(--accent);
}

@media (min-width: 46rem) {
  nav.sitenav { flex: 0 1 auto; }
  .sitehead .inner { align-items: center; }
}

/* ------------------------------------------------------------------ layout */
main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.5rem 1rem 4rem;
}
main.wide { max-width: 80rem; }

h1 {
  font-size: 1.6rem;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin: 0.4rem 0 0.6rem;
}
h2 {
  font-size: 1.2rem;
  letter-spacing: -0.01em;
  margin: 2.2rem 0 0.6rem;
  padding-top: 0.4rem;
}
h3 { font-size: 1.02rem; margin: 1.5rem 0 0.4rem; }
@media (min-width: 46rem) {
  h1 { font-size: 2.1rem; }
  h2 { font-size: 1.4rem; }
}

p, li { color: var(--fg); }
.lede { font-size: 1.08rem; color: var(--fg-soft); }
.dek { color: var(--fg-soft); font-size: 0.95rem; margin-top: -0.2rem; }
a { color: var(--accent); }
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 3px;
}

hr { border: 0; border-top: 1px solid var(--line); margin: 2rem 0; }

/* ------------------------------------------------------------------ blocks */
.card {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem;
  margin: 1rem 0;
}
.card > :first-child { margin-top: 0; }
.card > :last-child { margin-bottom: 0; }

.callout {
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  padding: 0.8rem 1rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1.2rem 0;
  font-size: 0.95rem;
}
.callout.warn {
  border-left-color: var(--warn-line);
  background: var(--warn-bg);
  color: var(--warn);
}
.callout.calm {
  border-left-color: var(--ok);
  background: var(--bg-soft);
}
.callout p:first-child { margin-top: 0; }
.callout p:last-child { margin-bottom: 0; }
.callout strong { color: inherit; }

.watermark {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font: 600 0.72rem/1 var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--warn);
  background: var(--warn-bg);
  border: 1px solid var(--warn-line);
  border-radius: 999px;
  padding: 0.3rem 0.6rem;
}

.grid2 { display: grid; gap: 1rem; }
@media (min-width: 52rem) {
  .grid2 { grid-template-columns: 1fr 1fr; }
  .grid2.sim { grid-template-columns: 19rem 1fr; align-items: start; }
}

/* ------------------------------------------------------------------ controls */
fieldset.controls {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.9rem 1rem 1.1rem;
  margin: 0 0 1rem;
  background: var(--bg-soft);
}
fieldset.controls legend {
  font: 600 0.78rem/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-faint);
  padding: 0 0.4rem;
}
.ctl { margin: 0.9rem 0; }
.ctl:first-of-type { margin-top: 0.3rem; }
.ctl label,
.ctl .ctl-label {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 0.6rem;
  font-size: 0.86rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}
.ctl .val {
  font: 600 0.82rem/1.4 var(--mono);
  color: var(--accent);
  order: 2;
  margin-left: auto;
  text-align: right;
}
/* A long value label (e.g. "179k/month = the requirement") wraps onto its own line
   rather than squeezing the control's name into two characters. */
@media (max-width: 30rem) {
  .ctl .val { margin-left: 0; flex: 1 1 100%; text-align: left; }
}
.ctl .hint {
  display: block;
  font-size: 0.76rem;
  color: var(--fg-faint);
  margin-top: 0.25rem;
}
input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
  margin: 0.15rem 0;
  min-height: 1.6rem;
}
select,
input[type="number"],
input[type="text"] {
  width: 100%;
  font: 400 0.92rem/1.3 var(--sans);
  padding: 0.5rem 0.55rem;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--line-strong);
  border-radius: 6px;
}
.radios { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.radios label {
  flex: 1 1 auto;
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  text-align: center;
  padding: 0.45rem 0.5rem;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  background: var(--bg);
  cursor: pointer;
  margin: 0;
}
.radios input { position: absolute; opacity: 0; width: 0; height: 0; }
.radios input:checked + span { font-weight: 700; }
.radios label:has(input:checked) {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--fg);
}
.radios label:has(input:focus-visible) { outline: 2px solid var(--accent); outline-offset: 2px; }

button.btn {
  font: 600 0.9rem/1 var(--sans);
  padding: 0.6rem 0.9rem;
  border-radius: 6px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}
button.btn.ghost { background: var(--bg); color: var(--accent); }

/* ------------------------------------------------------------------ readouts */
.readouts {
  display: grid;
  gap: 0.6rem;
  grid-template-columns: repeat(auto-fit, minmax(8.5rem, 1fr));
  margin: 0.8rem 0 1rem;
}
.ro {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.6rem 0.7rem;
}
.ro .k {
  font: 600 0.68rem/1.2 var(--mono);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--fg-faint);
  display: block;
}
.ro .v {
  font: 700 1.35rem/1.15 var(--sans);
  letter-spacing: -0.02em;
  display: block;
  margin-top: 0.25rem;
}
.ro .sub { font-size: 0.74rem; color: var(--fg-faint); display: block; }

/* ------------------------------------------------------------------ charts */
figure.chart {
  margin: 0 0 1.2rem;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.8rem;
}
figure.chart figcaption {
  font-size: 0.8rem;
  color: var(--fg-faint);
  margin-top: 0.5rem;
}
figure.chart .charttitle {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}
svg.plot { display: block; width: 100%; height: auto; overflow: visible; }
svg.plot text { font: 400 10px var(--sans); fill: var(--fg-faint); }
svg.plot .axis line, svg.plot .axis path { stroke: var(--line); }
svg.plot .gridline { stroke: var(--line); stroke-dasharray: 2 3; }
svg.plot .band { fill: var(--band); }
svg.plot .line-model { stroke: var(--chart-model); stroke-width: 2; fill: none; }
svg.plot .line-demand { stroke: var(--chart-demand); stroke-width: 1.5; stroke-dasharray: 5 4; fill: none; }
svg.plot .bar { fill: var(--chart-model); }
svg.plot .bar.alt { fill: var(--chart-demand); }
svg.plot .lbl { font-weight: 600; fill: var(--fg-soft); }

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 1rem;
  font-size: 0.78rem;
  color: var(--fg-soft);
  margin-top: 0.4rem;
}
.legend span { display: inline-flex; align-items: center; gap: 0.35rem; }
.legend i {
  width: 1.1rem;
  height: 0;
  border-top: 2px solid currentColor;
  display: inline-block;
}
.legend .k-model { color: var(--chart-model); }
.legend .k-demand { color: var(--chart-demand); }
.legend .k-demand i { border-top-style: dashed; }
.legend .k-band i { border-top: 0; height: 0.6rem; background: var(--band); }

/* ------------------------------------------------------------------ tables */
.tablewrap { overflow-x: auto; margin: 1rem 0; border: 1px solid var(--line); border-radius: var(--radius); }
table { border-collapse: collapse; width: 100%; font-size: 0.88rem; }
caption { text-align: left; font-size: 0.85rem; color: var(--fg-faint); padding: 0.5rem 0.7rem; }
th, td { text-align: left; padding: 0.5rem 0.7rem; border-bottom: 1px solid var(--line); vertical-align: top; }
thead th {
  background: var(--bg-sunken);
  font: 600 0.76rem/1.3 var(--mono);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--fg-soft);
  white-space: nowrap;
  position: sticky;
  top: 0;
}
tbody tr:last-child td { border-bottom: 0; }
td.num, th.num { text-align: right; font-family: var(--mono); font-variant-numeric: tabular-nums; white-space: nowrap; }

.grade {
  display: inline-block;
  font: 700 0.7rem/1 var(--mono);
  padding: 0.22rem 0.4rem;
  border-radius: 4px;
  border: 1px solid currentColor;
}
.grade.A { color: var(--grade-a); }
.grade.B { color: var(--grade-b); }
.grade.C { color: var(--grade-c); }
.grade.D { color: var(--grade-d); }
.grade.ASSUMPTION, .grade.X { color: var(--grade-x); }

/* ------------------------------------------------------------------ citations */
.cite { font-size: 0.82rem; color: var(--fg-faint); }
.cite a { color: var(--accent); }
ol.sources { font-size: 0.85rem; color: var(--fg-soft); padding-left: 1.4rem; }
ol.sources li { margin: 0.35rem 0; }
sup.ref { font-size: 0.7rem; line-height: 0; }
sup.ref a { text-decoration: none; padding: 0 0.1rem; }

details.src {
  border-top: 1px solid var(--line);
  margin-top: 0.5rem;
  padding-top: 0.4rem;
}
details.src summary {
  cursor: pointer;
  font-size: 0.8rem;
  color: var(--fg-faint);
  font-weight: 600;
}
details.src[open] summary { margin-bottom: 0.4rem; }
details.src ul { margin: 0.3rem 0 0; padding-left: 1.1rem; font-size: 0.8rem; color: var(--fg-soft); }

/* ------------------------------------------------------------------ misc */
.pill {
  display: inline-block;
  font: 600 0.72rem/1 var(--mono);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.28rem 0.5rem;
  border-radius: 999px;
  background: var(--bg-sunken);
  color: var(--fg-soft);
  border: 1px solid var(--line);
}
.mono { font-family: var(--mono); }
.nowrap { white-space: nowrap; }
.muted { color: var(--fg-faint); }
.big { font-size: 1.9rem; font-weight: 700; letter-spacing: -0.02em; line-height: 1.1; }
.tight { margin-top: 0.2rem; }
.status { font-size: 0.9rem; color: var(--fg-faint); padding: 1rem 0; }

ul.checks { list-style: none; padding-left: 0; }
ul.checks li { padding-left: 1.6rem; position: relative; margin: 0.5rem 0; }
ul.checks li::before {
  content: "";
  position: absolute;
  left: 0.25rem;
  top: 0.55rem;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 2px;
  background: var(--accent);
}
ul.steps { padding-left: 1.3rem; }
ul.steps li { margin: 0.6rem 0; }

.clocks { display: grid; gap: 0.7rem; grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr)); }
.clock {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.7rem 0.8rem;
  background: var(--bg-soft);
}
.clock .n { font: 700 1.7rem/1.05 var(--sans); letter-spacing: -0.03em; display: block; }
.clock .t { font-size: 0.8rem; color: var(--fg-soft); display: block; margin-top: 0.2rem; }
.clock .d { font-size: 0.74rem; color: var(--fg-faint); display: block; margin-top: 0.3rem; }

/* ------------------------------------------------------------------ footer */
footer.sitefoot {
  border-top: 1px solid var(--line);
  background: var(--bg-soft);
  font-size: 0.85rem;
  color: var(--fg-soft);
}
footer.sitefoot .inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.4rem 1rem 2.4rem;
  display: grid;
  gap: 1rem;
}
@media (min-width: 46rem) {
  footer.sitefoot .inner { grid-template-columns: 1.4fr 1fr 1fr; }
}
footer.sitefoot h2 {
  font: 600 0.74rem/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin: 0 0 0.5rem;
  padding: 0;
}
footer.sitefoot ul { list-style: none; margin: 0; padding: 0; }
footer.sitefoot li { margin: 0.25rem 0; }
footer.sitefoot a { color: var(--fg-soft); }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}

@media print {
  .sitehead, footer.sitefoot, fieldset.controls { display: none; }
}

/* ------------------------------------------------------------------ chart tooltip */
.charttip {
  position: absolute;
  pointer-events: none;
  background: var(--bg);
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  padding: 0.4rem 0.55rem;
  font-size: 0.78rem;
  line-height: 1.45;
  color: var(--fg);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.14);
  white-space: nowrap;
  z-index: 5;
}
.charttip .kk { font-weight: 600; }
.charttip .k-model { color: var(--chart-model); }
.charttip .k-demand { color: var(--chart-demand); }
.charttip .mut { color: var(--fg-faint); }

/* A hint that is a direct child of the control fieldset (i.e. not inside a .ctl)
   still needs to sit on its own line — e.g. the note under the reset button. */
fieldset.controls > .hint {
  display: block;
  font-size: 0.76rem;
  color: var(--fg-faint);
  margin-top: 0.55rem;
}