:root {
  --bg: #e4ebf1;
  --panel: #f4f7fa;
  --ink: #101820;
  --muted: #3e4c5c;
  --line: #b7c6d4;
  --cobalt: #14357a;
  --cobalt-ink: #f4f7fb;
  --signal: #c2410c;
  color-scheme: light;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  font-size: 1.05rem;
  line-height: 1.45;
}

a { color: var(--cobalt); }

.shell { width: min(1120px, calc(100% - 2rem)); margin: 0 auto; }

.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
  border-bottom: 3px solid var(--ink);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.92rem;
}

.mark {
  width: 1.7rem;
  height: 1.7rem;
  background: var(--cobalt);
  color: var(--cobalt-ink);
  display: grid;
  place-items: center;
  font-size: 0.85rem;
  font-weight: 700;
}

.bar nav { display: flex; gap: 1rem; align-items: center; }

.bar nav a {
  color: var(--ink);
  text-decoration: none;
  font-size: 0.92rem;
}

.bar nav a[aria-current="page"] { text-decoration: underline; text-underline-offset: 0.3em; }

.go {
  background: var(--cobalt);
  color: var(--cobalt-ink);
  text-decoration: none;
  padding: 0.55rem 0.8rem;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  font-weight: 650;
}

.go:hover { background: #0c2458; }

h1 {
  margin: 0;
  font-family: "Avenir Next Condensed", "Arial Narrow", "Helvetica Neue", sans-serif;
  font-size: clamp(2.8rem, 7vw, 5.2rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 0.88;
  text-transform: uppercase;
  max-width: 12ch;
}

.lede { font-size: 1.2rem; max-width: 36rem; }

.desk {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 1.25rem;
  padding: 1.4rem 0 1.6rem;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--ink);
  padding: 1rem 1rem 1.1rem;
}

.panel h2, .steps h2 { margin: 0 0 0.35rem; font-size: 1.15rem; }

label { display: block; font-size: 0.82rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }

input[type="number"] {
  width: 100%;
  margin: 0.35rem 0 0.8rem;
  padding: 0.7rem 0.75rem;
  font: inherit;
  font-size: 1.6rem;
  border: 1px solid var(--ink);
  background: white;
  color: var(--ink);
}

.result { display: grid; grid-template-columns: 1fr 1fr; gap: 0.6rem; }

.stat {
  border-top: 3px solid var(--cobalt);
  padding-top: 0.4rem;
}

.stat.warn { border-top-color: var(--signal); }

.stat b {
  display: block;
  font-family: "Avenir Next Condensed", "Arial Narrow", sans-serif;
  font-size: 2.4rem;
  line-height: 1;
}

.note { color: var(--muted); font-size: 0.92rem; }

.aside { padding-bottom: 1.4rem; }

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.8rem;
  padding-bottom: 1.4rem;
}

.steps article {
  background: transparent;
  border-top: 1px solid var(--ink);
  padding-top: 0.7rem;
}

.tools { display: grid; grid-template-columns: 1fr 1fr; gap: 0.8rem; padding-bottom: 1.6rem; }

.tools a.card {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 1rem;
  min-height: 100%;
}

.tools a.card:hover { border-color: var(--ink); }

.kicker {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

footer {
  border-top: 3px solid var(--ink);
  padding: 1rem 0 2rem;
  color: var(--muted);
  font-size: 0.92rem;
}

footer p { margin: 0.3rem 0; }

.page-head { padding: 1.3rem 0 0.4rem; }

@media (max-width: 800px) {
  .desk, .steps, .tools, .result { grid-template-columns: 1fr; }
  .bar { align-items: flex-start; flex-direction: column; }
  h1 { max-width: none; }
}