/* Сайт AITU SMM: шапка, первый экран из двух колонок (текст и пример диалога), далее полосы-разделы. Цвета — из styles.css. */
html { height: auto; scroll-behavior: smooth; }
body.site { height: auto; background: var(--surface); font-size: 16px; line-height: 1.55; }
.site a { text-decoration: none; }
.site main, .top, .foot { width: min(1120px, 100% - 40px); margin-inline: auto; }
.site main { width: 100%; }

.top { display: flex; align-items: center; gap: 24px; padding: 18px 0; }
.logo { display: flex; align-items: center; gap: 10px; font: 600 16px/1 var(--display); color: var(--ink); }
.logo i { width: 28px; height: 28px; border-radius: 8px; background: var(--accent); color: var(--on-accent); display: grid; place-items: center; font: 800 14px var(--body); font-style: normal; }
.top nav { display: flex; gap: 22px; margin-left: auto; }
.top nav a { color: var(--muted); font-weight: 700; font-size: 14px; }
.top nav a:hover { color: var(--ink); }
.btn.big { padding: 12px 22px; font-size: 15px; border-radius: 10px; }
.site .btn { display: inline-block; color: var(--ink); }
.site .btn.primary { color: var(--on-accent); }

.hero { width: min(1120px, 100% - 40px); margin: 0 auto; padding: 48px 0 72px; display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr); gap: 56px; align-items: center; }
.eyebrow { margin: 0 0 14px; font-weight: 800; font-size: 13px; letter-spacing: 0.06em; color: var(--accent); }
.hero h1 { font: 600 clamp(28px, 4.2vw, 44px)/1.15 var(--display); letter-spacing: -0.02em; margin-bottom: 20px; }
.intro { color: var(--muted); font-size: 17px; max-width: 58ch; margin: 0 0 26px; }

.mock { background: var(--bg); border: 1px solid var(--line); border-radius: 18px; overflow: hidden; box-shadow: 0 24px 60px -30px rgba(18, 26, 43, 0.45); font-size: 14px; line-height: 1.45; }
.mock-head, .mock-foot { background: var(--surface); padding: 12px 16px; display: flex; align-items: center; gap: 10px; }
.mock-head { border-bottom: 1px solid var(--line); }
.mock-foot { border-top: 1px solid var(--line); justify-content: space-between; }
.mock-body { padding: 16px; display: flex; flex-direction: column; gap: 8px; }
.mock .msg { max-width: 84%; }

.band { padding: 72px max(20px, calc((100% - 1120px) / 2)); }
.band.alt { background: var(--bg); }
.band h2, .cta h2 { font: 600 clamp(22px, 3vw, 30px)/1.2 var(--display); letter-spacing: -0.01em; margin-bottom: 14px; }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; margin-top: 28px; }
.features article { border: 1px solid var(--line); border-radius: 14px; padding: 22px; background: var(--surface); }
.features h3, .channels h3 { font-size: 17px; margin: 12px 0 8px; }
.features p, .channels p { margin: 0; color: var(--muted); font-size: 15px; }
.tag { font-size: 12px; font-weight: 800; color: var(--ai-ink); background: var(--ai); border-radius: 999px; padding: 3px 10px; }

.flow { list-style: none; margin: 30px 0 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; counter-reset: flow; }
.flow li { counter-increment: flow; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 22px 22px 22px 68px; position: relative; color: var(--muted); font-size: 15px; }
.flow li::before { content: counter(flow); position: absolute; left: 20px; top: 20px; width: 34px; height: 34px; border-radius: 50%; background: var(--ink); color: var(--surface); display: grid; place-items: center; font: 600 14px var(--display); }
.flow b { display: block; color: var(--ink); font-size: 16px; margin-bottom: 4px; }

.channels { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; margin-top: 28px; }
.channels > div { border-top: 3px solid var(--line); padding-top: 18px; }
.channels .dot { width: 14px; height: 14px; display: block; }

.cta { margin: 0 auto 72px; width: min(1120px, 100% - 40px); background: var(--nav); color: #fff; border-radius: 20px; padding: 48px 32px; text-align: center; }
.cta p { color: var(--nav-ink); margin: 0 0 24px; }
.foot { display: flex; justify-content: space-between; padding: 22px 0 40px; color: var(--muted); font-size: 14px; border-top: 1px solid var(--line); }

@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; gap: 36px; padding-top: 24px; }
  .top nav { display: none; }
  .top .btn { margin-left: auto; }
  .band { padding-block: 52px; }
}