/* uassist.ru — ИИ-автоматизация бизнеса. Статика без сборки. */
:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fb;
  --ink: #0f172a;
  --ink-soft: #475569;
  --ink-mute: #64748b;
  --line: #e2e8f0;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --accent-soft: #eff4ff;
  --green: #059669;
  --amber: #d97706;
  --radius: 14px;
  --wrap: 1140px;
  --shadow: 0 10px 40px rgba(15, 23, 42, .08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; }
a { color: var(--accent); }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }

/* ---------- шапка ---------- */
.site-head {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.head-in { display: flex; align-items: center; gap: 26px; height: 66px; }
.logo {
  font-size: 22px; font-weight: 800; letter-spacing: -.6px;
  text-decoration: none; color: var(--ink); flex-shrink: 0;
}
.logo span { color: var(--accent); }
.nav { display: flex; gap: 22px; margin-left: auto; align-items: center; }
.nav a {
  color: var(--ink-soft); text-decoration: none; font-size: 15px; font-weight: 500;
  white-space: nowrap;
}
.nav a:hover { color: var(--accent); }
.nav .btn { color: #fff; }
.burger { display: none; background: none; border: 0; font-size: 26px; cursor: pointer; margin-left: auto; }

/* ---------- кнопки ---------- */
.btn {
  display: inline-block; text-decoration: none; cursor: pointer;
  background: var(--accent); color: #fff; border: 1px solid var(--accent);
  padding: 12px 22px; border-radius: 10px; font-weight: 600; font-size: 16px;
  transition: background .15s, transform .1s;
}
.btn:hover { background: var(--accent-dark); border-color: var(--accent-dark); }
.btn:active { transform: translateY(1px); }
.btn-ghost { background: transparent; color: var(--accent); }
.btn-ghost:hover { background: var(--accent-soft); }
.btn-sm { padding: 9px 16px; font-size: 15px; }
.btn-lg { padding: 15px 30px; font-size: 17px; }

/* ---------- герой ---------- */
.hero { padding: 74px 0 64px; background:
  radial-gradient(1100px 420px at 12% -8%, #e8f0ff 0%, rgba(255,255,255,0) 62%),
  radial-gradient(900px 380px at 92% 4%, #eafaf3 0%, rgba(255,255,255,0) 60%); }
.hero h1 {
  font-size: clamp(32px, 5vw, 54px); line-height: 1.12; margin: 0 0 20px;
  letter-spacing: -1.2px; font-weight: 800; max-width: 15ch;
}
.hero .lead { font-size: clamp(17px, 2vw, 21px); color: var(--ink-soft); max-width: 62ch; margin: 0 0 30px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }
.hero-note { font-size: 15px; color: var(--ink-mute); margin-top: 16px; }

.eyebrow {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; color: var(--accent); background: var(--accent-soft);
  padding: 6px 12px; border-radius: 999px; margin-bottom: 18px;
}

/* ---------- секции ---------- */
section { padding: 66px 0; }
section.soft { background: var(--bg-soft); }
h2 { font-size: clamp(26px, 3.4vw, 38px); line-height: 1.2; letter-spacing: -.7px; margin: 0 0 14px; font-weight: 800; }
h3 { font-size: 20px; margin: 0 0 8px; font-weight: 700; letter-spacing: -.2px; }
.sec-lead { color: var(--ink-soft); font-size: 18px; max-width: 68ch; margin: 0 0 34px; }

/* ---------- сетка карточек ---------- */
.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; transition: box-shadow .18s, transform .18s, border-color .18s;
}
.card p { color: var(--ink-soft); margin: 0; font-size: 16px; }
a.card { text-decoration: none; color: inherit; display: block; }
a.card:hover { box-shadow: var(--shadow); transform: translateY(-3px); border-color: #c7d7f5; }
.card .ico { font-size: 26px; margin-bottom: 12px; display: block; }
.card .more { color: var(--accent); font-weight: 600; font-size: 15px; margin-top: 14px; display: inline-block; }

/* ---------- список преимуществ ---------- */
.checks { list-style: none; padding: 0; margin: 0; display: grid; gap: 13px; }
.checks li { padding-left: 30px; position: relative; color: var(--ink-soft); }
.checks li::before {
  content: "✓"; position: absolute; left: 0; top: -1px;
  color: var(--green); font-weight: 800; font-size: 17px;
}
.checks b { color: var(--ink); }

/* ---------- цифры ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.stat { text-align: center; }
.stat .num { font-size: clamp(30px, 4vw, 42px); font-weight: 800; color: var(--accent); letter-spacing: -1px; }
.stat .cap { color: var(--ink-mute); font-size: 15px; margin-top: 2px; }

/* ---------- таблица ---------- */
.tbl-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); }
table.t { width: 100%; border-collapse: collapse; background: #fff; min-width: 520px; }
table.t th, table.t td { padding: 14px 18px; text-align: left; border-bottom: 1px solid var(--line); font-size: 16px; }
table.t th { background: var(--bg-soft); font-size: 14px; text-transform: uppercase; letter-spacing: .04em; color: var(--ink-mute); font-weight: 700; }
table.t tr:last-child td { border-bottom: 0; }
table.t td.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }

/* ---------- FAQ ---------- */
.faq details {
  border: 1px solid var(--line); border-radius: 12px; padding: 0 20px; background: #fff;
  margin-bottom: 12px;
}
.faq summary {
  cursor: pointer; font-weight: 650; padding: 17px 0; list-style: none;
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--accent); font-size: 22px; font-weight: 400; flex-shrink: 0; }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 0 0 18px; color: var(--ink-soft); }

/* ---------- форма ---------- */
.cta { background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 100%); color: #fff; }
.cta h2 { color: #fff; }
.cta .sec-lead { color: #c7d2fe; }
.form {
  background: #fff; border-radius: var(--radius); padding: 28px; max-width: 520px;
  box-shadow: var(--shadow);
}
.form label { display: block; font-size: 14px; color: var(--ink-mute); margin-bottom: 6px; font-weight: 600; }
.form input, .form textarea {
  width: 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px;
  font: inherit; font-size: 16px; margin-bottom: 16px; color: var(--ink); background: #fff;
}
.form input:focus, .form textarea:focus { outline: 2px solid #bfd3fa; border-color: var(--accent); }
.form textarea { resize: vertical; min-height: 92px; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-note { font-size: 13px; color: var(--ink-mute); margin: 12px 0 0; }
.form-msg { margin-top: 14px; font-weight: 600; display: none; }
.form-msg.ok { color: var(--green); display: block; }
.form-msg.err { color: #dc2626; display: block; }
.cta-grid { display: grid; grid-template-columns: 1fr 520px; gap: 44px; align-items: start; }
.contacts-list { list-style: none; padding: 0; margin: 26px 0 0; display: grid; gap: 12px; }
.contacts-list a { color: #fff; font-weight: 600; }

/* ---------- подвал ---------- */
.site-foot { background: #0f172a; color: #94a3b8; padding: 46px 0 30px; font-size: 15px; }
.foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 30px; margin-bottom: 30px; }
.site-foot a { color: #cbd5e1; text-decoration: none; display: block; margin-bottom: 9px; }
.site-foot a:hover { color: #fff; }
.site-foot h4 { color: #fff; font-size: 15px; margin: 0 0 14px; }
.foot-bot { border-top: 1px solid #1e293b; padding-top: 20px; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 14px; }

/* ---------- хлебные крошки ---------- */
.crumbs { font-size: 14px; color: var(--ink-mute); padding: 18px 0 0; }
.crumbs a { color: var(--ink-mute); text-decoration: none; }
.crumbs a:hover { color: var(--accent); }

/* ---------- контент-блок ---------- */
.prose { max-width: 74ch; }
.prose p { color: var(--ink-soft); }
.prose ul { color: var(--ink-soft); padding-left: 22px; }
.prose li { margin-bottom: 8px; }
.prose h3 { color: var(--ink); margin-top: 30px; }

.pill-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 22px; }
.pill {
  background: #fff; border: 1px solid var(--line); border-radius: 999px;
  padding: 8px 16px; font-size: 15px; color: var(--ink-soft); text-decoration: none;
}
.pill:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- адаптив ---------- */
@media (max-width: 980px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .cta-grid { grid-template-columns: 1fr; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 700px) {
  body { font-size: 16px; }
  section { padding: 48px 0; }
  .hero { padding: 52px 0 44px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .nav { display: none; }
  .nav.open {
    display: flex; flex-direction: column; position: absolute; top: 66px; left: 0; right: 0;
    background: #fff; padding: 18px 20px; gap: 16px; border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow); align-items: flex-start;
  }
  .burger { display: block; }
  .form { padding: 22px; }
}