:root {
  --bg: #f6f7fb;
  --panel: #ffffff;
  --ink: #10131c;
  --muted: #5b6478;
  --line: #e3e6ef;
  --accent: #2544d8;
  --accent-soft: #eaeeff;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(16, 19, 28, .05), 0 12px 28px -18px rgba(16, 19, 28, .35);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0e14;
    --panel: #151924;
    --ink: #eef1f8;
    --muted: #9aa3b8;
    --line: #262c3b;
    --accent: #7d93ff;
    --accent-soft: #1c2440;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 16px 34px -20px rgba(0, 0, 0, .8);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 32px 20px 56px;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.5 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 460px; margin: 0 auto; }

.head { margin-bottom: 22px; }
h1 {
  margin: 0;
  font-size: 27px;
  font-weight: 640;
  letter-spacing: -.021em;
}
.tagline { margin: 6px 0 0; color: var(--muted); font-size: 15px; }

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}
.card + .card { margin-top: 16px; }

.field + .field { margin-top: 18px; }
label {
  display: block;
  font-size: 13px;
  font-weight: 560;
  letter-spacing: .01em;
  color: var(--muted);
  margin-bottom: 7px;
}

input[type="number"] {
  width: 100%;
  padding: 11px 13px;
  font: inherit;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 10px;
  -moz-appearance: textfield;
  appearance: textfield;
}
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
input[type="number"]:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.input-affix { position: relative; }
.affix {
  position: absolute;
  top: 50%;
  left: 13px;
  transform: translateY(-50%);
  color: var(--muted);
  pointer-events: none;
}
.affix-end { left: auto; right: 13px; }
.input-affix .affix ~ input { padding-left: 28px; }
.input-affix input:first-child { padding-right: 30px; }

.presets { display: flex; gap: 6px; margin-bottom: 8px; }
.preset {
  flex: 1;
  padding: 7px 0;
  font: inherit;
  font-size: 14px;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
  transition: color .12s, border-color .12s, background .12s;
}
.preset:hover { color: var(--ink); border-color: var(--muted); }
.preset[aria-pressed="true"] {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
  font-weight: 560;
}

.stepper { display: flex; align-items: center; gap: 8px; }
.stepper input { text-align: center; }
.step {
  width: 42px;
  height: 42px;
  flex: none;
  font: inherit;
  font-size: 20px;
  line-height: 1;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 10px;
  cursor: pointer;
}
.step:hover { border-color: var(--muted); }

.check {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 18px 0 0;
  font-size: 14px;
  font-weight: 400;
  color: var(--ink);
  cursor: pointer;
  text-transform: none;
  letter-spacing: 0;
}
.check input { accent-color: var(--accent); width: 16px; height: 16px; }

.results { padding: 6px 20px; }
.row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}
.row:last-of-type { border-bottom: 0; }
.row-label { font-size: 14px; color: var(--muted); }
.row-value { font-variant-numeric: tabular-nums; font-size: 17px; font-weight: 560; }
.row-hero .row-label { color: var(--ink); font-weight: 560; }
.row-hero .row-value {
  font-size: 30px;
  font-weight: 660;
  letter-spacing: -.02em;
  color: var(--accent);
}

.note { margin: 0 0 14px; font-size: 13px; color: var(--muted); }
.note:empty { display: none; }

.foot {
  margin: 20px 2px 0;
  font-size: 12.5px;
  color: var(--muted);
  text-align: center;
}