:root {
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f7f8f6;
  color: #20231f;
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; }
a { color: inherit; text-decoration: none; }
.shell { width: min(1040px, calc(100% - 40px)); margin: 0 auto; }
.nav { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 20px; border-bottom: 1px solid #dde2da; }
.brand { font-weight: 680; font-size: 18px; }
.links { display: flex; gap: 16px; flex-wrap: wrap; color: #586054; font-size: 14px; }
.hero { padding: 74px 0 42px; display: grid; gap: 22px; }
.hero h1 { margin: 0; max-width: 780px; font-size: clamp(38px, 7vw, 82px); line-height: .98; font-weight: 650; letter-spacing: 0; }
.hero p { margin: 0; max-width: 640px; color: #586054; font-size: 18px; line-height: 1.65; }
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; padding: 22px 0 70px; }
.tile { min-height: 150px; border: 1px solid #dce2da; background: #ffffff; padding: 22px; border-radius: 8px; display: flex; flex-direction: column; justify-content: space-between; }
.tile h2, .panel h2 { margin: 0; font-size: 20px; line-height: 1.2; font-weight: 620; }
.tile p, .panel p, .doc p { margin: 10px 0 0; color: #586054; line-height: 1.6; }
.panel { border: 1px solid #dce2da; background: #ffffff; border-radius: 8px; padding: 22px; }
.stack { display: grid; gap: 16px; padding: 22px 0 70px; }
.chat { display: grid; gap: 12px; }
.bubble { max-width: 74%; padding: 12px 14px; border-radius: 8px; line-height: 1.5; }
.bubble.left { background: #eef2ec; }
.bubble.right { margin-left: auto; background: #20231f; color: #fff; }
.form { display: grid; grid-template-columns: 1fr auto; gap: 10px; margin-top: 16px; }
.form input { min-width: 0; border: 1px solid #cfd7cd; border-radius: 8px; padding: 12px 14px; font: inherit; background: #fff; }
.form button { border: 0; border-radius: 8px; padding: 12px 16px; font: inherit; background: #20231f; color: #fff; cursor: pointer; }
.doc { padding: 22px; border-left: 3px solid #20231f; background: #fff; }
.video-shell { overflow: hidden; border-radius: 8px; border: 1px solid #dce2da; background: #111; }
.video-shell video, .video-shell img { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.footer { border-top: 1px solid #dde2da; padding: 22px 0 34px; color: #747b71; font-size: 13px; }
@media (max-width: 760px) {
  .nav { align-items: flex-start; flex-direction: column; padding: 18px 0; }
  .grid { grid-template-columns: 1fr; }
  .bubble { max-width: 100%; }
  .form { grid-template-columns: 1fr; }
}