:root {
  --ink: #191d33;
  --ink-soft: #2a2f4d;
  --paper: #f4f5f7;
  --white: #ffffff;
  --gold: #f0b429;
  --slate: #5a6072;
  --line: #e2e4ea;
  --radius: 14px;
  --max: 1080px;
}

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

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
}

body {
  font-family: "Inter", system-ui, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  font-size: 16px;
}

h1, h2, h3 { font-family: "Space Grotesk", sans-serif; line-height: 1.15; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* Header */
header {
  background: var(--white);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 10;
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.logo {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700; font-size: 1.25rem; letter-spacing: -0.02em;
  color: var(--ink); text-decoration: none;
  display: flex; align-items: center; gap: 10px;
}
.logo .mark {
  width: 30px; height: 30px; border-radius: 8px;
  background: var(--ink); color: var(--gold);
  display: grid; place-items: center;
  font-size: 0.95rem;
}
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a {
  color: var(--slate); text-decoration: none; font-size: 0.92rem; font-weight: 500;
}
.nav-links a:hover, .nav-links a:focus-visible { color: var(--ink); }
a:focus-visible { outline: 2px solid var(--gold); outline-offset: 3px; border-radius: 4px; }

/* Hero */
.hero { padding: 88px 0 72px; }
.hero-grid {
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 56px; align-items: center;
}
.eyebrow {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.78rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--slate); margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(2.1rem, 4.4vw, 3.2rem);
  letter-spacing: -0.03em; margin-bottom: 20px;
}
.hero h1 em { font-style: normal; box-shadow: inset 0 -0.45em 0 var(--gold); }
.hero p.lede { font-size: 1.12rem; color: var(--slate); max-width: 46ch; margin-bottom: 28px; }
.btn {
  display: inline-block; background: var(--ink); color: var(--white);
  padding: 13px 26px; border-radius: 10px; text-decoration: none;
  font-weight: 600; font-size: 0.95rem;
}
.btn:hover { background: var(--ink-soft); }

/* Demo card (signature) */
.demo-card {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; box-shadow: 0 14px 40px rgba(25, 29, 51, 0.08);
}
.demo-label {
  font-family: "IBM Plex Mono", monospace; font-size: 0.72rem;
  text-transform: uppercase; letter-spacing: 0.1em; color: var(--slate);
  margin-bottom: 8px;
}
.demo-before {
  color: var(--slate); text-decoration: line-through; font-size: 0.95rem;
  margin-bottom: 18px;
}
.demo-after {
  font-weight: 600; font-size: 1.02rem; margin-bottom: 18px;
}
.demo-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.demo-tags span {
  font-family: "IBM Plex Mono", monospace; font-size: 0.74rem;
  background: var(--paper); border: 1px solid var(--line);
  padding: 4px 10px; border-radius: 999px; color: var(--ink-soft);
}

/* Sections */
section { padding: 64px 0; }
section.alt { background: var(--white); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
h2.section-title { font-size: 1.7rem; letter-spacing: -0.02em; margin-bottom: 14px; }
.section-intro { color: var(--slate); max-width: 62ch; margin-bottom: 40px; }

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.step {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px;
}
section.alt .step { background: var(--paper); }
.step .num {
  font-family: "IBM Plex Mono", monospace; color: var(--gold);
  background: var(--ink); width: 34px; height: 34px; border-radius: 9px;
  display: grid; place-items: center; font-size: 0.85rem; margin-bottom: 16px;
}
.step h3 { font-size: 1.05rem; margin-bottom: 8px; }
.step p { color: var(--slate); font-size: 0.93rem; }

.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px 32px; }
.feature { padding-left: 18px; border-left: 3px solid var(--gold); }
.feature h3 { font-size: 1rem; margin-bottom: 4px; }
.feature p { color: var(--slate); font-size: 0.92rem; }

/* API transparency */
.api-box {
  background: var(--ink); color: #d8dbe8; border-radius: var(--radius);
  padding: 36px; font-size: 0.95rem;
}
.api-box h2 { color: var(--white); font-size: 1.4rem; margin-bottom: 14px; }
.api-box ul { list-style: none; margin-top: 8px; }
.api-box li { padding: 7px 0 7px 26px; position: relative; }
.api-box li::before {
  content: "→"; position: absolute; left: 0; color: var(--gold);
  font-family: "IBM Plex Mono", monospace;
}
.api-box code {
  font-family: "IBM Plex Mono", monospace; font-size: 0.85em;
  background: rgba(255, 255, 255, 0.09); padding: 2px 7px; border-radius: 6px;
}

/* Legal pages */
.legal { padding: 64px 0 80px; max-width: 760px; }
.legal h1 { font-size: 2rem; letter-spacing: -0.02em; margin-bottom: 8px; }
.legal .updated {
  font-family: "IBM Plex Mono", monospace; font-size: 0.8rem; color: var(--slate);
  margin-bottom: 36px;
}
.legal h2 { font-size: 1.2rem; margin: 34px 0 10px; }
.legal p, .legal li { color: #3a3f56; font-size: 0.97rem; }
.legal ul { padding-left: 22px; margin-top: 8px; }
.legal li { margin-bottom: 6px; }

/* Footer */
footer {
  background: var(--white); border-top: 1px solid var(--line);
  padding: 44px 0; font-size: 0.88rem; color: var(--slate);
}
.footer-grid { display: flex; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.footer-links { display: flex; gap: 22px; }
.footer-links a { color: var(--slate); text-decoration: none; }
.footer-links a:hover { color: var(--ink); }
.disclaimer {
  margin-top: 26px; padding-top: 22px; border-top: 1px solid var(--line);
  font-size: 0.85rem; max-width: 72ch;
}

@media (max-width: 820px) {
  .hero { padding: 56px 0 48px; }
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .steps { grid-template-columns: 1fr; }
  .feature-list { grid-template-columns: 1fr; }
  .nav-links { gap: 16px; }
  .nav-links a:not(.btn-nav) { display: none; }
}