* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; min-height: 100vh;
  background: var(--scene), var(--bg); background-attachment: fixed;
  color: var(--text); font: 400 17px/1.6 var(--ui);
}
a { color: var(--primary); text-underline-offset: 3px; }
a:focus-visible, .btn:focus-visible { outline: 2px solid var(--primary); outline-offset: 3px; }
.wrap { width: min(1080px, 100% - 32px); margin-inline: auto; }

.top { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 22px 0; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none;
  font-weight: 600; font-size: 19px; letter-spacing: -.01em; }
.brand svg { width: 32px; height: 32px; flex: none; }
.top nav { display: flex; align-items: center; gap: 20px; font-size: 15px; }
.top nav a:not(.btn) { color: var(--text-2); text-decoration: none; }
.top nav a:not(.btn):hover { color: var(--text); }

.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 44px;
  padding: 0 20px; border-radius: 999px; font: 500 15px/1 var(--ui); text-decoration: none;
  border: 1px solid var(--border); color: var(--text); background: var(--glass); }
.btn:hover { background: var(--hover); }
.btn.primary { background: var(--primary); border-color: transparent; color: var(--on-primary); }
.btn.primary:hover { filter: brightness(1.06); }

.hero { display: grid; grid-template-columns: 1.1fr .9fr; gap: 56px; align-items: center; padding: 56px 0 80px; }
.eyebrow { font: 500 13px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--primary); margin: 0 0 18px; }
h1 { font-size: clamp(38px, 6vw, 60px); line-height: 1.05; letter-spacing: -.03em; font-weight: 600; margin: 0 0 20px; text-wrap: balance; }
.lede { font-size: 19px; color: var(--text-2); margin: 0 0 32px; max-width: 34em; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }

.demo { background: var(--card); border: 1px solid var(--border); border-radius: 24px; padding: 20px;
  box-shadow: var(--pop); }
.demo-head { display: flex; align-items: center; gap: 12px; padding-bottom: 16px; border-bottom: 1px solid var(--border); margin-bottom: 16px; }
.avatar { width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; flex: none;
  background: var(--primary-soft); color: var(--selected-text); font: 600 14px/1 var(--ui); }
.demo-head b { display: block; font-weight: 600; font-size: 15px; }
.demo-head span { font: 400 12px/1.3 var(--mono); color: var(--text-2); }
.bubbles { display: flex; flex-direction: column; gap: 8px; font-size: 15px; line-height: 1.4; }
.bubble { max-width: 82%; padding: 10px 14px; border-radius: 18px; }
.bubble.in { align-self: flex-start; background: var(--bubble-in); color: var(--bubble-in-text); border-bottom-left-radius: 6px; }
.bubble.out { align-self: flex-end; background: var(--primary); color: var(--on-primary); border-bottom-right-radius: 6px; }
.note { align-self: stretch; background: var(--note-bg); color: var(--note-text); border-radius: 12px; padding: 8px 12px; font-size: 13px; }
.meta { align-self: flex-end; font: 400 12px/1 var(--mono); color: var(--text-2); }

section { padding: 72px 0; border-top: 1px solid var(--border); }
h2 { font-size: clamp(28px, 4vw, 38px); line-height: 1.15; letter-spacing: -.02em; font-weight: 600; margin: 0 0 12px; text-wrap: balance; }
.sub { color: var(--text-2); margin: 0 0 40px; max-width: 40em; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 20px; padding: 24px; }
.card h3 { font-size: 18px; font-weight: 600; margin: 14px 0 8px; letter-spacing: -.01em; }
.card p { margin: 0; color: var(--text-2); font-size: 15px; }
.icon { width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center;
  background: var(--primary-soft); color: var(--primary); }
.icon svg { width: 22px; height: 22px; }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.list { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.list li { display: grid; grid-template-columns: 22px 1fr; gap: 12px; color: var(--text-2); font-size: 16px; }
.list li::before { content: ""; width: 8px; height: 8px; margin: 9px 0 0 6px; border-radius: 50%; background: var(--primary); }
.list b { color: var(--text); font-weight: 600; }

.cta { text-align: center; padding: 88px 0; }
.cta .sub { margin-inline: auto; }
.cta .actions { justify-content: center; }

footer { border-top: 1px solid var(--border); padding: 28px 0 40px; color: var(--text-2); font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 24px; }
footer nav { display: flex; gap: 20px; }
footer a { color: var(--text-2); }

.doc { max-width: 720px; padding: 32px 0 72px; }
.doc h1 { font-size: clamp(34px, 5vw, 46px); }
.doc h2 { font-size: 24px; margin: 40px 0 10px; }
.doc p, .doc li { color: var(--text-2); }
.doc strong { color: var(--text); font-weight: 600; }
.doc ul { padding-left: 22px; }
.doc li { margin: 6px 0; }
.doc .updated { font: 400 13px/1 var(--mono); color: var(--text-2); margin: 0 0 32px; }

@media (max-width: 860px) {
  .hero, .split { grid-template-columns: 1fr; gap: 40px; }
  .hero { padding-top: 24px; }
  .grid { grid-template-columns: 1fr; }
  section { padding: 56px 0; }
}
@media (max-width: 480px) {
  .top nav a.hide-sm { display: none; }
  .actions .btn { flex: 1 1 auto; }
}