:root {
  --ink: #08080a;
  --ink-elevated: #121216;
  --paper: #ffffff;
  --muted-bg: #f4f5f4;
  --line: #e2e4e2;
  --text: #1a1a1a;
  --text-muted: #5a5c5a;
  --signal: #24963f;
  --danger: #dc303a;
  --caution: #f9ab00;
  --on-ink: #ffffff;
  --on-ink-muted: rgba(255, 255, 255, 0.72);
  --font: "Outfit", "Segoe UI", sans-serif;
  --tracking-wordmark: -0.055em;
  --measure: 40rem;
  --radius: 2px;
  --phi: 1.618034;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  color-scheme: only light;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--paper);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
}

body {
  padding: 2.5rem 1.25rem 4rem;
}

.hero,
main,
footer {
  max-width: 44rem;
  margin: 0 auto;
}

.hero {
  padding-bottom: 2.25rem;
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--line);
}

.lockup {
  display: block;
  width: min(100%, 22rem);
  height: auto;
  margin: 0 0 1.5rem;
}

.lead {
  font-size: 1.15rem;
  font-weight: 400;
  max-width: var(--measure);
  margin: 0 0 1.5rem;
}

.ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 0 0 1.25rem;
}

.button {
  display: inline-block;
  background: var(--ink);
  color: var(--on-ink);
  padding: 0.7rem 1.35rem;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  border: 1px solid transparent;
  border-radius: var(--radius);
}

.button:hover {
  background: var(--ink-elevated);
  color: var(--on-ink);
}

.button:active {
  background: var(--ink);
  transform: translateY(1px);
  opacity: 0.92;
}

.button:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

.button:visited {
  color: var(--on-ink);
}

.button.ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--line);
}

.button.ghost:visited {
  color: var(--text);
}

.button.ghost:hover {
  background: var(--muted-bg);
  border-color: var(--text-muted);
  color: var(--text);
}

.note,
.prose,
footer {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.note {
  margin: 0;
  max-width: var(--measure);
}

section {
  margin: 0 0 3rem;
}

h2 {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0 0 0.75rem;
}

.story {
  display: block;
  width: min(100%, 28rem);
  height: auto;
  margin: 0.5rem 0 1rem;
}

.steps {
  margin: 0;
  padding-left: 1.2rem;
  max-width: var(--measure);
}

.steps li {
  margin: 0.35rem 0;
}

.scale {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  align-items: center;
  margin: 1rem 0;
}

.scale button {
  width: 2.6rem;
  height: 2.6rem;
  border-radius: 50%;
  border: 4px solid var(--ink);
  background: transparent;
  color: transparent;
  cursor: pointer;
  padding: 0;
  transition: transform 0.2s var(--ease);
}

.scale button:hover,
.scale button:focus-visible {
  transform: scale(var(--phi));
}

.scale button:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
}

.scale button[aria-checked="true"] {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  .scale button:hover,
  .scale button:focus-visible,
  .button:active {
    transform: none;
  }
}

.tip {
  display: inline-flex;
  flex-direction: column;
  gap: 0.15rem;
  background: var(--ink);
  color: var(--on-ink);
  padding: 0.65rem 0.9rem;
  border-left: 2px solid var(--signal);
  font-size: 0.95rem;
  min-width: 12rem;
}

.tip.is-ai {
  border-left-color: var(--danger);
}

.tip.is-mid {
  border-left-color: var(--caution);
}

.tip-pct {
  font-weight: 700;
}

.tip-line {
  color: var(--on-ink-muted);
  font-size: 0.85rem;
}

.engines {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin: 1rem 0;
}

@media (max-width: 640px) {
  .engines {
    grid-template-columns: 1fr;
  }
}

.engines article {
  background: var(--muted-bg);
  padding: 1rem 1.1rem;
  border-radius: var(--radius);
}

.engines h3 {
  margin: 0 0 0.2rem;
  font-size: 1.05rem;
  letter-spacing: var(--tracking-wordmark);
}

.engines a {
  color: var(--ink);
  text-decoration: none;
}

.engines a:hover,
.engines a:focus-visible {
  text-decoration: underline;
}

.mod,
.nums {
  margin: 0;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.engines code,
.prose code {
  font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: 0.84em;
  font-weight: 500;
  color: var(--ink);
}

.nums {
  margin-top: 0.45rem;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

footer {
  border-top: 1px solid var(--line);
  padding-top: 1.5rem;
}

footer a {
  color: var(--ink);
}

footer a:visited {
  color: var(--ink);
}

::selection {
  background: rgba(36, 150, 63, 0.14);
  color: var(--text);
}