:root {
  --bg: #f7f9fc; --panel: #ffffff; --ink: #1a2333; --muted: #64748b;
  --accent: #2563eb; --accent2: #1d4ed8; --line: #e2e8f0; --ok: #16a34a;
  --radius: 14px; --shadow: 0 8px 30px rgba(15, 40, 90, .08);
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body { font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--ink); }
.wrap { max-width: 1100px; margin: 0 auto; padding: 0 20px; }
.row { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
h1 { font-size: 40px; line-height: 1.15; margin: 0 0 16px; letter-spacing: -.5px; }
h1 em { font-style: normal; color: var(--accent); }
h2 { font-size: 28px; margin: 0 0 24px; text-align: center; }
h3 { margin: 0 0 6px; font-size: 17px; }
.muted { color: var(--muted); }
.center { text-align: center; }
.hint { color: var(--muted); font-size: 13px; }

.btn { display: inline-block; padding: 10px 18px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--panel); color: var(--ink); text-decoration: none; font-weight: 600; cursor: pointer; transition: .15s; }
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent2); color: #fff; }
.btn.small { padding: 7px 14px; font-size: 14px; }
.btn.big { padding: 14px 34px; font-size: 18px; }

/* ---------- шапка ---------- */
.top { position: sticky; top: 0; background: rgba(247, 249, 252, .9); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line); z-index: 10; }
.top .wrap { height: 60px; }
.logo { font-size: 22px; font-weight: 800; letter-spacing: -.5px; }
.logo span { color: var(--accent); }
nav { display: flex; align-items: center; gap: 20px; }
nav a { color: var(--ink); text-decoration: none; font-size: 15px; }
nav a:hover { color: var(--accent); }

/* ---------- hero ---------- */
.hero { padding: 60px 0 70px; }
.hero-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 40px; align-items: center; }
.sub { font-size: 18px; color: var(--muted); margin: 0 0 26px; }
.hero-cta { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }

/* ---------- чат ---------- */
.chat { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); display: flex; flex-direction: column; overflow: hidden; }
.chat-head { padding: 12px 16px; border-bottom: 1px solid var(--line); font-weight: 700; font-size: 15px;
  display: flex; align-items: center; gap: 8px; }
.chat-head .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--ok); }
.chat-sub { font-weight: 400; color: var(--muted); font-size: 13px; margin-left: auto; }
.chat-log { padding: 14px; min-height: 240px; max-height: 340px; overflow-y: auto;
  display: flex; flex-direction: column; gap: 10px; }
.msg { max-width: 85%; padding: 9px 13px; border-radius: 12px; font-size: 14.5px; white-space: pre-wrap; }
.msg.bot { background: #eef4ff; border-bottom-left-radius: 4px; }
.msg.user { background: var(--accent); color: #fff; align-self: flex-end; border-bottom-right-radius: 4px; }
.msg.wait { color: var(--muted); }
.chat-recs { display: flex; flex-direction: column; gap: 6px; padding: 0 14px; }
.chat-recs .rec { display: block; border: 1px solid var(--line); border-radius: 10px; padding: 8px 12px;
  text-decoration: none; color: var(--ink); transition: .15s; }
.chat-recs .rec:hover { border-color: var(--accent); }
.chat-recs .rec b { display: block; font-size: 14px; }
.chat-recs .rec span { font-size: 12.5px; color: var(--muted); }
.chat-form { display: flex; gap: 8px; padding: 12px 14px; border-top: 1px solid var(--line); margin-top: 10px; }
.chat-form input { flex: 1; border: 1px solid var(--line); border-radius: 10px; padding: 10px 14px;
  font-size: 15px; outline: none; }
.chat-form input:focus { border-color: var(--accent); }

/* ---------- как это работает ---------- */
.how { padding: 60px 0; background: var(--panel); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.step { padding: 22px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg); }
.step .ico { font-size: 30px; margin-bottom: 10px; }
.step p { margin: 0; font-size: 14.5px; color: var(--muted); }

/* ---------- курсы ---------- */
.courses { padding: 60px 0; }
.cgrid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.ccard { display: block; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px; text-decoration: none; color: var(--ink); transition: .15s; box-shadow: 0 2px 10px rgba(15,40,90,.04); }
.ccard:hover { border-color: var(--accent); transform: translateY(-2px); }
.ccard h3 { font-size: 16px; }
.cmeta { font-size: 13px; color: var(--muted); margin-bottom: 10px; }
.ctags { display: flex; flex-wrap: wrap; gap: 6px; }
.ctags span { font-size: 12px; background: #eef4ff; color: var(--accent2); border-radius: 20px; padding: 2px 10px; }

/* ---------- оплата и бонусы ---------- */
.pay { padding: 60px 0 80px; }
.pay-lead { max-width: 720px; margin: 0 auto 30px; text-align: center; color: var(--muted); font-size: 17px; }
.pay-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.pay-card { padding: 26px 24px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel);
  text-align: center; box-shadow: 0 2px 10px rgba(15,40,90,.04); }
.pay-ico { font-size: 32px; margin-bottom: 12px; }
.pay-card p { margin: 6px 0 0; color: var(--muted); font-size: 14.5px; }
.pay-card b { color: var(--ink); }
.pay-cta { text-align: center; margin-top: 36px; }
.pay-cta .hint { margin-top: 14px; line-height: 1.6; }

footer { border-top: 1px solid var(--line); padding: 22px 0; background: var(--panel); }
.legal-nav { display: flex; gap: 14px; flex-wrap: wrap; font-size: 13px; }
.legal-nav a { color: var(--muted); text-decoration: none; }
.legal-nav a:hover { color: var(--accent); }
.chat-legal { margin: 0; padding: 0 14px 12px; font-size: 11.5px; color: var(--muted); line-height: 1.4; }
.chat-legal a { color: var(--muted); }

@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .cgrid { grid-template-columns: 1fr 1fr; }
  h1 { font-size: 30px; }
  nav a:not(.btn) { display: none; }
}
@media (max-width: 560px) {
  .steps, .cgrid, .pay-cards { grid-template-columns: 1fr; }
}