:root {
  --cream: #f7f0e4;
  --paper: #fffaf0;
  --ink: #3d2b1f;
  --soft: #7a6552;
  --amber: #d4a017;
  --gold: #c9a227;
  --rust: #c45c26;
  --sage: #6b8f4e;
  --line: #e4d5bc;
  --shadow: 0 8px 28px rgba(61, 43, 31, 0.08);
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: "Source Sans 3", "Segoe UI", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  min-height: 100vh;
  background:
    radial-gradient(ellipse at 20% 0%, #f0e0c0 0%, transparent 50%),
    radial-gradient(ellipse at 90% 10%, #efe6d2 0%, transparent 45%),
    var(--cream);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.5;
}

.page {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.75rem 1.15rem 2.25rem;
}

.masthead {
  border-bottom: 2px solid var(--ink);
  padding-bottom: 1.1rem;
  margin-bottom: 1.4rem;
}
.wordmark {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  margin-bottom: 0.65rem;
}
.ornament {
  color: var(--gold);
  font-size: 1.4rem;
  line-height: 1.6;
}
.kicker {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--soft);
  font-weight: 600;
}
h1 {
  font-family: var(--serif);
  font-size: clamp(1.9rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.1;
}
.standfirst {
  font-family: var(--serif);
  font-size: 1.05rem;
  color: var(--soft);
  max-width: 38rem;
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 1.15rem;
  align-items: start;
}

.sheet {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 0.35rem;
  padding: 1.25rem 1.3rem 1.4rem;
  box-shadow: var(--shadow);
}
.sheet h2 {
  font-family: var(--serif);
  font-size: 1.2rem;
  margin-bottom: 0.4rem;
  color: var(--ink);
}
.note {
  font-size: 0.88rem;
  color: var(--soft);
  margin-bottom: 1rem;
}

.form {
  display: grid;
  gap: 0.85rem;
}
.form label { display: flex; flex-direction: column; gap: 0.3rem; }
.form label > span {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--soft);
}
.form input {
  border: 1.5px solid var(--line);
  background: #fffdf8;
  border-radius: 0.3rem;
  padding: 0.65rem 0.75rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.form input:focus {
  outline: none;
  border-color: var(--amber);
  box-shadow: 0 0 0 3px rgba(212, 160, 23, 0.2);
}

.formula {
  margin-top: 1.1rem;
  padding: 0.75rem 0.85rem;
  background: #f3e8d4;
  border-left: 3px solid var(--gold);
  border-radius: 0 0.25rem 0.25rem 0;
  font-size: 0.86rem;
}
.formula strong {
  display: block;
  font-family: var(--serif);
  margin-bottom: 0.25rem;
}
.formula code {
  color: var(--rust);
  font-size: 0.82rem;
}

.gauge-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 0.25rem 0 0.85rem;
}
#gauge-svg { width: min(100%, 300px); height: auto; }
.tick-label {
  fill: var(--soft);
  font-size: 11px;
  font-family: var(--sans);
  font-weight: 600;
}
.readout { text-align: center; margin-top: -0.5rem; }
.readout .big {
  font-family: var(--serif);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--ink);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.readout .unit {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--soft);
  margin-top: 0.2rem;
}
.readout .regime {
  margin-top: 0.35rem;
  font-family: var(--serif);
  font-size: 1.05rem;
  color: var(--amber);
  font-weight: 700;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.55rem;
  margin-bottom: 0.55rem;
}
.stat {
  background: #f3e8d4;
  border-radius: 0.3rem;
  padding: 0.65rem 0.55rem;
  text-align: center;
}
.stat .sl {
  display: block;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--soft);
  font-weight: 700;
  margin-bottom: 0.2rem;
}
.stat .sv {
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.asterisk {
  font-size: 0.75rem;
  color: var(--soft);
  margin-bottom: 0.9rem;
}

.regimes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.45rem;
  margin-bottom: 0.75rem;
}
.reg {
  font-size: 0.78rem;
  color: var(--soft);
  padding: 0.5rem 0.55rem;
  border-radius: 0.3rem;
  border: 1px solid var(--line);
  background: #fffdf8;
}
.reg span {
  display: block;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 0.1rem;
}
.reg.low span { color: var(--sage); }
.reg.mid span { color: var(--amber); }
.reg.high span { color: var(--rust); }

.edu {
  font-size: 0.84rem;
  color: var(--soft);
  font-style: italic;
  font-family: var(--serif);
}

.colophon {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-size: 0.82rem;
  color: var(--soft);
}
.colophon strong { color: var(--rust); }
.colophon .fine {
  margin-top: 0.4rem;
  font-size: 0.74rem;
  letter-spacing: 0.02em;
}

@media (max-width: 760px) {
  .grid { grid-template-columns: 1fr; }
  .stats, .regimes { grid-template-columns: 1fr; }
}