:root {
  color-scheme: light;
  --page: #f9f9f7;
  --surface: #fcfcfb;
  --ink: #0b0b0b;
  --ink-2: #52514e;
  --muted: #898781;
  --grid: #e1e0d9;
  --axis: #c3c2b7;
  --ring: rgba(11, 11, 11, 0.1);
  --pay: #2a78d6;
  --sp: #eb6834;
  --fixed: #1baf7a;
  --infl: #eda100;
  --home: #e87ba4;
  --good: #006300;
  --focus: #2a78d6;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --page: #0d0d0d;
    --surface: #1a1a19;
    --ink: #f0efec;
    --ink-2: #c3c2b7;
    --grid: #2c2c2a;
    --axis: #383835;
    --ring: rgba(255, 255, 255, 0.1);
    --pay: #3987e5;
    --sp: #d95926;
    --fixed: #199e70;
    --infl: #c98500;
    --home: #d55181;
    --good: #0ca30c;
    --focus: #3987e5;
  }
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 15px;
  line-height: 1.5;
}

.wrap { width: min(1180px, 100%); margin: 0 auto; padding-inline: 20px; }

/* ---------- Top bar ---------- */

.topbar { background: var(--surface); border-bottom: 1px solid var(--ring); }
.topbar-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-block: 12px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; }

.logo {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background:
    linear-gradient(135deg, transparent 52%, var(--sp) 52% 64%, transparent 64%),
    var(--pay);
}

.back { color: var(--ink-2); text-decoration: none; font-size: 14px; }
.back:hover { color: var(--ink); text-decoration: underline; }

/* ---------- Intro ---------- */

.intro { padding-block: 28px 8px; }
.intro h1 { margin: 0 0 6px; font-size: clamp(22px, 3.2vw, 30px); line-height: 1.2; letter-spacing: -0.01em; max-width: 28em; }
.intro p { margin: 0; color: var(--ink-2); max-width: 46em; }

/* ---------- Layout ---------- */

.layout {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
  padding-block: 18px 48px;
}

.inputs {
  position: sticky;
  top: 16px;
  padding: 6px 18px 18px;
  border-radius: 14px;
  background: var(--surface);
  box-shadow: 0 0 0 1px var(--ring);
}

fieldset { margin: 0; padding: 12px 0; border: 0; border-bottom: 1px solid var(--ring); }
legend { padding: 0; margin-bottom: 8px; font-size: 12px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); float: left; width: 100%; }
legend + * { clear: both; }

label { display: block; margin-top: 8px; color: var(--ink-2); font-size: 13.5px; }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

input[type="number"], select {
  display: block;
  width: 100%;
  margin-top: 4px;
  padding: 8px 10px;
  border: 1px solid var(--ring);
  border-radius: 8px;
  background: var(--page);
  color: var(--ink);
  font: inherit;
  font-variant-numeric: tabular-nums;
}

.field { position: relative; display: block; }
.field.money input { padding-left: 22px; }
.field.money::before { content: "$"; position: absolute; left: 10px; top: 50%; transform: translateY(-38%); color: var(--muted); }
.field.pct input { padding-right: 26px; }
.field.pct::after { content: "%"; position: absolute; right: 10px; top: 50%; transform: translateY(-38%); color: var(--muted); }

.check { display: flex; align-items: center; gap: 8px; margin-top: 12px; color: var(--ink); }
.check input { width: 16px; height: 16px; accent-color: var(--pay); }

.sub-opts { margin: 0 0 6px 24px; }
.hint { margin: 6px 0 0; color: var(--muted); font-size: 12.5px; }

.computed { margin: 10px 0 0; color: var(--ink); font-weight: 600; font-size: 14px; }

.btn {
  margin-top: 14px;
  padding: 8px 14px;
  border: 1px solid var(--ring);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.btn:hover { background: var(--page); }
.btn.small { padding: 5px 10px; font-size: 13px; }

input:focus-visible, select:focus-visible, .btn:focus-visible, summary:focus-visible, a:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }

/* ---------- Results ---------- */

.period { margin: 0; color: var(--muted); font-size: 13px; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; }
.headline { margin: 4px 0 16px; font-size: 19px; line-height: 1.4; max-width: 40em; }

.chart-card {
  position: relative;
  padding: 16px 16px 14px;
  border-radius: 14px;
  background: var(--surface);
  box-shadow: 0 0 0 1px var(--ring);
}

.legend { display: flex; flex-wrap: wrap; gap: 6px 18px; margin-bottom: 8px; color: var(--ink-2); font-size: 13px; }
.legend span { display: inline-flex; align-items: center; gap: 6px; }

.swatch { display: inline-block; width: 10px; height: 10px; border-radius: 3px; flex: none; }
.swatch.pay, .card.pay .swatch { background: var(--pay); }
.swatch.sp, .card.sp .swatch { background: var(--sp); }
.swatch.fixed, .card.fixed .swatch { background: var(--fixed); }
.swatch.infl, .card.infl .swatch { background: var(--infl); }
.swatch.home { background: var(--home); }

/* Legend keys are little line samples, dashed where the line is dashed */
.key { display: inline-block; width: 18px; height: 0; border-top: 2.5px solid; flex: none; }
.key.pay { border-color: var(--pay); }
.key.sp { border-color: var(--sp); }
.key.fixed { border-color: var(--fixed); }
.key.infl { border-color: var(--infl); border-top-style: dashed; }
.key.home { border-color: var(--home); border-top-style: dotted; border-top-width: 3px; }

.chart { position: relative; width: 100%; }
.chart svg { display: block; width: 100%; height: auto; overflow: visible; }

.grid { stroke: var(--grid); stroke-width: 1; }
.zero { stroke: var(--axis); stroke-width: 1; }
.tick { fill: var(--muted); font-size: 11.5px; font-variant-numeric: tabular-nums; }
.line { fill: none; stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
.line.pay { stroke: var(--pay); }
.line.sp { stroke: var(--sp); }
.line.fixed { stroke: var(--fixed); }
.line.infl { stroke: var(--infl); stroke-dasharray: 7 4; }
.line.home { stroke: var(--home); stroke-dasharray: 1.5 4; stroke-width: 2.5; }
.dot, .hover-dot { stroke: var(--surface); stroke-width: 2; }
.dot.pay, .hover-dot.pay { fill: var(--pay); }
.dot.sp, .hover-dot.sp { fill: var(--sp); }
.dot.fixed, .hover-dot.fixed { fill: var(--fixed); }
.dot.infl, .hover-dot.infl { fill: var(--infl); }
.dot.home, .hover-dot.home { fill: var(--home); }
.end-name { fill: var(--ink-2); font-size: 12px; font-weight: 600; }
.end-value { fill: var(--ink); font-size: 12px; font-variant-numeric: tabular-nums; }
.cross { stroke: var(--axis); stroke-width: 1; stroke-dasharray: 3 3; }
.hit { fill: transparent; cursor: crosshair; }

.tip {
  position: absolute;
  z-index: 5;
  min-width: 210px;
  padding: 8px 10px;
  border-radius: 10px;
  background: var(--surface);
  box-shadow: 0 0 0 1px var(--ring), 0 8px 24px rgba(0, 0, 0, 0.14);
  font-size: 13px;
  pointer-events: none;
}

.tip p { display: flex; align-items: center; gap: 6px; margin: 2px 0; color: var(--ink-2); }
.tip p b { margin-left: auto; padding-left: 12px; color: var(--ink); font-variant-numeric: tabular-nums; }
.tip .tip-date { margin-bottom: 4px; color: var(--ink); font-weight: 700; }

.chart-note { margin: 10px 0 0; color: var(--muted); font-size: 12.5px; }

.table-wrap { margin-top: 10px; overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 13.5px; font-variant-numeric: tabular-nums; }
th, td { padding: 6px 10px; text-align: right; border-bottom: 1px solid var(--grid); white-space: nowrap; }
th:first-child { text-align: left; }
thead th { color: var(--ink-2); font-weight: 600; }
tbody th { font-weight: 500; color: var(--ink-2); }

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 14px;
  margin-top: 16px;
}

.card {
  padding: 14px 16px;
  border-radius: 14px;
  background: var(--surface);
  box-shadow: 0 0 0 1px var(--ring);
}

.card h3 { display: flex; align-items: center; gap: 8px; margin: 0; font-size: 14px; color: var(--ink-2); }
.best { margin-left: auto; padding: 1px 8px; border-radius: 999px; background: color-mix(in srgb, var(--good) 14%, transparent); color: var(--good); font-size: 12px; }
.big { margin: 6px 0 0; font-size: 28px; font-weight: 700; letter-spacing: -0.01em; }
.caption { margin: 0 0 8px; color: var(--muted); font-size: 12px; }
.card dl { margin: 0; }
.card dl div { display: flex; justify-content: space-between; gap: 10px; padding: 5px 0; border-top: 1px solid var(--grid); font-size: 13.5px; }
.card dt { color: var(--ink-2); }
.card dd { margin: 0; font-weight: 600; text-align: right; font-variant-numeric: tabular-nums; }

.how { margin-top: 18px; padding: 12px 16px; border-radius: 14px; background: var(--surface); box-shadow: 0 0 0 1px var(--ring); color: var(--ink-2); font-size: 14px; }
.how summary { cursor: pointer; color: var(--ink); font-weight: 600; }
.how ul { padding-left: 20px; }
.how li { margin: 6px 0; }

/* ---------- Narrow screens ---------- */

@media (max-width: 860px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
  .inputs { position: static; }
}

@media (max-width: 480px) {
  .wrap { padding-inline: 16px; }
  .back .long { display: none; }
  .headline { font-size: 17px; }
}