:root {
  color-scheme: light;
  --ink: #1a1916;
  --muted: #6d675e;
  --paper: #f4f1ea;
  --accent: #1a6b46;
  font-family: Georgia, "Iowan Old Style", Palatino, serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
}

main {
  max-width: 34rem;
  margin: 0 auto;
  padding: 2.75rem 1.25rem 4rem;
}

h1 {
  font-size: 1.85rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 1.1rem;
}

h2 {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.55rem;
  font-family: ui-monospace, "Source Code Pro", Menlo, Consolas, monospace;
}

.presets {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  margin: 0 0 1.4rem;
}

.presets button {
  appearance: none;
  background: none;
  border: 0;
  padding: 0;
  font: inherit;
  font-size: 0.95rem;
  color: var(--muted);
  cursor: pointer;
}

.presets button:hover { color: var(--ink); }
.presets button.active {
  color: var(--ink);
  box-shadow: inset 0 -1px 0 var(--ink);
}

.spot {
  margin: 0 0 0.75rem;
  font-size: 1.15rem;
  line-height: 1.5;
}

.spot input {
  width: 1.35em;
  font: inherit;
  font-size: 1.15rem;
  color: var(--ink);
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--ink);
  padding: 0;
  margin: 0;
  text-align: center;
  vertical-align: baseline;
}

#yards-to-endzone { width: 1.55em; }

textarea {
  width: 100%;
  margin: 0 0 1.75rem;
  padding: 0;
  font: inherit;
  font-size: 1.05rem;
  line-height: 1.45;
  color: var(--ink);
  background: transparent;
  border: 0;
  border-bottom: 1px solid #d5cec2;
  resize: none;
}

textarea:focus, .spot input:focus, .presets button:focus-visible {
  outline: none;
}

.spot input:focus, textarea:focus {
  border-bottom-color: var(--accent);
}

#call {
  font-size: clamp(3.2rem, 12vw, 4.4rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 0.95;
  margin: 0 0 0.4rem;
  text-transform: capitalize;
}

#why, #read {
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.4;
  margin: 0 0 1.5rem;
}

#read {
  margin: 1.4rem 0 0;
  font-size: 0.95rem;
}

.cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.cols ol {
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: ui-monospace, "Source Code Pro", Menlo, Consolas, monospace;
  font-size: 0.92rem;
}

.cols ol li {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.22rem 0;
  color: var(--muted);
}

.cols ol li.best {
  color: var(--accent);
}

#math {
  margin-top: 2rem;
}

#math summary {
  cursor: pointer;
  color: var(--muted);
  font-size: 0.95rem;
  list-style: none;
}

#math summary::-webkit-details-marker { display: none; }

#math summary::before {
  content: "▸ ";
}

#math[open] summary::before {
  content: "▾ ";
}

.math-steps {
  margin: 0.5rem 0 0;
  padding: 0 0 0 1.15rem;
  color: var(--ink);
  font-size: 1.02rem;
  line-height: 1.4;
}

.math-steps li {
  margin: 0.45rem 0;
}

.math-steps strong {
  font-weight: 600;
}

.eq {
  font-family: ui-monospace, "Source Code Pro", Menlo, Consolas, monospace;
  font-size: 0.9rem;
  color: var(--muted);
  margin: 0.2rem 0 0;
}

.eq sup { font-size: 0.7em; }

.math-rule {
  margin: 0.65rem 0 0;
}

@media (max-width: 520px) {
  .cols { grid-template-columns: 1fr; gap: 1.1rem; }
  .spot input { width: 2.7rem; }
}