:root {
  color-scheme: light dark;
  --bg: #ffffff; --fg: #15151a; --muted: #5b5b66; --line: #e6e6ea; --card: #f6f6f9;
  --accent: #4f46e5; --accent-2: #6366f1; --accent-fg: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #111114; --fg: #eaeaf0; --muted: #a0a0ad; --line: #26262c; --card: #18181d; --accent: #6366f1; --accent-2: #818cf8; }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; background: var(--bg); color: var(--fg); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 20px; }
header { display: flex; align-items: center; justify-content: space-between; padding: 18px 0; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 20px; color: var(--fg); }
.logo svg { width: 32px; height: 32px; }
.logo .mark { width: 32px; height: 32px; border-radius: 9px; background: var(--accent); color: #fff; display: flex; align-items: center; justify-content: center; }
.logo .mark svg { width: 22px; height: 22px; }
nav a { margin-left: 18px; color: var(--muted); font-size: 15px; }
.lang { border: 1px solid var(--line); border-radius: 999px; padding: 4px 10px; font-size: 13px; cursor: pointer; background: transparent; color: var(--fg); }
.hero { padding: 72px 0 48px; display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; align-items: center; }
.hero h1 { font-size: 46px; line-height: 1.12; margin: 0 0 16px; letter-spacing: -0.02em; }
.hero p.lead { font-size: 19px; color: var(--muted); margin: 0 0 28px; }
.cta { display: inline-flex; align-items: center; gap: 10px; background: var(--accent); color: var(--accent-fg); padding: 13px 20px; border-radius: 10px; font-weight: 600; }
.cta:hover { background: var(--accent-2); text-decoration: none; }
.cta.secondary { background: transparent; color: var(--fg); border: 1px solid var(--line); margin-left: 10px; }
.note { font-size: 13px; color: var(--muted); margin-top: 12px; }
.demo { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 18px; }
.chat { display: flex; flex-direction: column; gap: 10px; font-size: 15px; }
.bubble { padding: 10px 14px; border-radius: 14px; max-width: 85%; }
.bubble.in { background: var(--bg); border: 1px solid var(--line); align-self: flex-start; }
.bubble.out { background: var(--accent); color: #fff; align-self: flex-end; }
.bubble .tag { display: block; font-size: 11px; opacity: .7; margin-bottom: 2px; }
.variants { margin-top: 12px; border: 1px solid var(--line); border-radius: 12px; background: var(--bg); overflow: hidden; font-size: 14px; }
.variants .head { padding: 8px 12px; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 12px; display: flex; gap: 8px; }
.variants .head span { border: 1px solid var(--line); border-radius: 6px; padding: 1px 8px; }
.variants .v { padding: 10px 12px; display: flex; gap: 10px; }
.variants .v + .v { border-top: 1px solid var(--line); }
.variants .n { flex: none; width: 20px; height: 20px; border-radius: 6px; background: var(--card); font-size: 11px; font-weight: 700; display: flex; align-items: center; justify-content: center; color: var(--accent); }
section { padding: 48px 0; }
section h2 { font-size: 30px; margin: 0 0 8px; letter-spacing: -0.01em; }
section p.sub { color: var(--muted); margin: 0 0 28px; font-size: 17px; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 20px; }
.card h3 { margin: 0 0 8px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; counter-reset: step; }
.steps .card::before { counter-increment: step; content: counter(step); display: inline-flex; width: 28px; height: 28px; border-radius: 8px; background: var(--accent); color: #fff; align-items: center; justify-content: center; font-weight: 700; margin-bottom: 10px; }
.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.plan { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 22px; }
.plan.featured { border-color: var(--accent); }
.plan .price { font-size: 30px; font-weight: 700; margin: 6px 0 2px; }
.plan .per { color: var(--muted); font-size: 13px; margin-bottom: 14px; }
.plan ul { margin: 0; padding-left: 18px; color: var(--muted); font-size: 15px; }
.plan li { margin: 4px 0; }
.faq details { border-bottom: 1px solid var(--line); padding: 12px 0; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq p { color: var(--muted); margin: 8px 0 0; }
footer { border-top: 1px solid var(--line); padding: 28px 0; color: var(--muted); font-size: 14px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
footer a { color: var(--muted); margin-right: 16px; }
.legal { max-width: 760px; }
.legal h1 { font-size: 34px; margin: 40px 0 6px; }
.legal .updated { color: var(--muted); margin-bottom: 28px; }
.legal h2 { font-size: 20px; margin: 28px 0 8px; }
.legal p, .legal li { color: var(--fg); }
.legal table { border-collapse: collapse; width: 100%; font-size: 15px; }
.legal th, .legal td { text-align: left; border-bottom: 1px solid var(--line); padding: 8px 6px; vertical-align: top; }
html[lang="en"] [data-lang="ru"], html[lang="ru"] [data-lang="en"] { display: none !important; }
@media (max-width: 820px) {
  .hero { grid-template-columns: 1fr; padding-top: 40px; }
  .hero h1 { font-size: 34px; }
  .grid, .steps, .plans { grid-template-columns: 1fr; }
  nav a { margin-left: 12px; }
}