:root {
  --bg: #ffffff;
  --bg-alt: #f6f6f4;
  --fg: #111111;
  --muted: #5c5c58;
  --line: #e3e3df;
  --accent: #0b6e4f;
  --accent-fg: #ffffff;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111111;
    --bg-alt: #181817;
    --fg: #ececea;
    --muted: #9b9b96;
    --line: #2a2a28;
    --accent: #3fbf8f;
    --accent-fg: #0b1a14;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

h1, h2 { line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 16px; }
h1 { font-size: clamp(36px, 6vw, 60px); max-width: 16ch; }
h2 { font-size: clamp(24px, 3.2vw, 32px); }
p { margin: 0 0 16px; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 720px; }
.block { padding-top: 96px; padding-bottom: 96px; }
.alt { background: var(--bg-alt); border-block: 1px solid var(--line); }

/* header */
.top {
  position: sticky; top: 0; z-index: 10;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}
.top-in { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.logo { font-weight: 800; font-size: 24px; letter-spacing: -0.04em; text-decoration: none; }
nav { display: flex; align-items: center; gap: 24px; font-size: 15px; }
nav a:not(.btn) { text-decoration: none; color: var(--muted); }
nav a:not(.btn):hover { color: var(--fg); }

/* buttons */
.btn {
  display: inline-block;
  background: var(--accent);
  color: var(--accent-fg);
  padding: 14px 22px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
}
.btn:hover { filter: brightness(1.08); }
.btn-sm { padding: 8px 14px; font-size: 14px; }
.link { color: var(--muted); text-decoration: none; }
.link:hover { color: var(--fg); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

/* hero */
.hero { padding-top: 112px; padding-bottom: 96px; }
.eyebrow { color: var(--accent); font-weight: 600; font-size: 15px; }
.lead { font-size: 20px; color: var(--muted); max-width: 60ch; margin-bottom: 32px; }
.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 24px; }
.note { margin-top: 32px; font-size: 14px; color: var(--muted); }

/* pain */
.pain { border-top: 1px solid var(--line); padding: 72px 0; }
.cols3 { list-style: none; margin: 32px 0 0; padding: 0; display: grid; gap: 32px; grid-template-columns: repeat(3, 1fr); }
.cols3 li { border-top: 2px solid var(--fg); padding-top: 16px; }
.cols3 strong { display: block; margin-bottom: 8px; }
.cols3 span { color: var(--muted); }

/* split layouts */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: start; }
.split p { color: var(--muted); }

/* document trail */
.trail { list-style: none; margin: 0; padding: 0; border: 1px solid var(--line); border-radius: 8px; }
.trail li {
  display: grid; grid-template-columns: 150px 1fr auto; gap: 16px; align-items: baseline;
  padding: 14px 18px; border-bottom: 1px solid var(--line); font-size: 15px;
}
.trail li:last-child { border-bottom: 0; }
.trail code { font-family: var(--mono); font-size: 13px; color: var(--muted); }
.trail em { font-style: normal; font-size: 13px; color: var(--muted); white-space: nowrap; }
.trail em.done { color: var(--accent); font-weight: 600; }

/* chat */
.chat { display: flex; flex-direction: column; gap: 10px; font-size: 15px; }
.chat p { margin: 0; padding: 10px 14px; border-radius: 8px; max-width: 88%; }
.chat .me { align-self: flex-end; background: var(--fg); color: var(--bg); }
.chat .bot { align-self: flex-start; background: var(--bg); border: 1px solid var(--line); color: var(--fg); }

/* features */
.features { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 64px; margin: 32px 0 0; }
.features div { padding: 20px 0; border-top: 1px solid var(--line); }
.features dt { font-weight: 600; margin-bottom: 4px; }
.features dd { margin: 0; color: var(--muted); }

/* faq */
details { border-top: 1px solid var(--line); padding: 18px 0; }
details:last-child { border-bottom: 1px solid var(--line); }
summary { cursor: pointer; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; color: var(--muted); font-weight: 400; }
details[open] summary::after { content: "\2212"; }
details p { margin: 12px 0 0; color: var(--muted); }

/* final cta */
.cta { text-align: center; }
.cta h2 { max-width: 20ch; margin-inline: auto; }
.cta p { color: var(--muted); margin-bottom: 32px; }

/* footer */
.foot {
  display: flex; justify-content: space-between;
  padding-top: 24px; padding-bottom: 40px;
  border-top: 1px solid var(--line);
  font-size: 14px; color: var(--muted);
}

@media (max-width: 820px) {
  .split, .features, .cols3 { grid-template-columns: 1fr; gap: 32px; }
  .features { gap: 0; }
  .block { padding-top: 64px; padding-bottom: 64px; }
  .hero { padding-top: 64px; padding-bottom: 64px; }
  nav a:not(.btn) { display: none; }
  .trail li { grid-template-columns: 1fr auto; }
  .trail code { grid-column: 1 / -1; }
}

@media (max-width: 480px) {
  .wrap { padding: 0 16px; }
  body { font-size: 16px; }
  .lead { font-size: 18px; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }