:root {
  --bg: #111418; --panel: #1a1f26; --panel2: #222933; --text: #e8eaed;
  --muted: #9aa4b0; --accent: #4f9cf9; --ok: #4caf50; --radius: 14px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { background: var(--bg); color: var(--text); font: 16px/1.6 "Segoe UI", system-ui, sans-serif; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 20px; }
header { padding: 18px 0; border-bottom: 1px solid #232b36; }
header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.logo { font-size: 20px; font-weight: 700; }
.logo span { color: var(--accent); }
nav { display: flex; align-items: center; }
nav a { color: var(--muted); text-decoration: none; margin-left: 18px; font-size: 15px; }
nav a:hover { color: var(--text); }
.langs { margin-left: 22px; font-size: 14px; }
.langs a { margin-left: 8px; color: var(--muted); text-decoration: none; }
.langs a.cur { color: var(--accent); font-weight: 700; }
.btn { display: inline-block; padding: 12px 26px; border-radius: 10px; text-decoration: none;
       font-weight: 600; border: 1px solid var(--accent); }
.btn.primary { background: var(--accent); color: #fff; }
.btn.ghost { color: var(--accent); }
.btn:hover { filter: brightness(1.15); }
.hero { padding: 72px 0 48px; text-align: center; }
.hero h1 { font-size: clamp(28px, 5vw, 44px); line-height: 1.25; margin-bottom: 18px; }
.hero h1 em { color: var(--accent); font-style: normal; }
.hero p.sub { color: var(--muted); font-size: 19px; max-width: 640px; margin: 0 auto 30px; }
.hero .actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.hero .note { color: var(--muted); font-size: 13px; margin-top: 14px; }
.demo { max-width: 620px; margin: 48px auto 0; background: var(--panel); border: 1px solid #2c3542;
        border-radius: var(--radius); padding: 18px; text-align: left; font-size: 14px; }
.demo .msg { padding: 9px 13px; border-radius: 10px; margin: 8px 0; max-width: 85%; }
.demo .user { background: #2a3f5c; margin-left: auto; }
.demo .agent { background: var(--panel2); }
.demo .tool { color: var(--muted); font-size: 12px; padding: 2px 13px; }
.demo .ok { color: var(--ok); }
section { padding: 56px 0; border-top: 1px solid #1d242e; }
h2 { font-size: 28px; margin-bottom: 26px; text-align: center; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; }
.card { background: var(--panel); border: 1px solid #2c3542; border-radius: var(--radius); padding: 20px; }
.card h3 { font-size: 17px; margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 14px; }
.steps { counter-reset: step; }
.steps .card::before { counter-increment: step; content: counter(step); display: inline-block;
  width: 30px; height: 30px; line-height: 30px; text-align: center; background: var(--accent);
  color: #fff; border-radius: 50%; font-weight: 700; margin-bottom: 10px; }
.boards { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.chip { background: var(--panel2); border: 1px solid #2c3542; border-radius: 20px; padding: 6px 16px; font-size: 14px; }
.price-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; max-width: 760px; margin: 0 auto; }
.price { background: var(--panel); border: 1px solid #2c3542; border-radius: var(--radius); padding: 26px; text-align: center; }
.price.hot { border-color: var(--accent); }
.price .name { font-size: 18px; font-weight: 700; margin-bottom: 6px; }
.price .cost { font-size: 30px; font-weight: 700; margin: 12px 0 4px; }
.price .per { color: var(--muted); font-size: 13px; margin-bottom: 14px; }
.price ul { list-style: none; color: var(--muted); font-size: 14px; margin-bottom: 20px; }
.price li { margin: 6px 0; }
footer { padding: 34px 0; border-top: 1px solid #1d242e; color: var(--muted); font-size: 13px; }
footer .wrap { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
footer a { color: var(--muted); }