.app-intro { max-width: 1000px; margin: 0 auto; }
.app-intro h1 { margin: 12px 0 16px; font-size: 40px; line-height: 1.2; }
.app-intro h2 { margin: 0 0 24px; font-size: 26px; line-height: 1.35; }
.app-intro h3 { margin: 0 0 10px; font-size: 18px; line-height: 1.4; }
.app-intro p { line-height: 1.75; }
.app-intro-header { padding: 16px 0 36px; }
.app-intro-header > p { max-width: 760px; }
.app-intro-lead { margin: 0 0 14px; font-size: 22px; }
.app-intro-release { font-size: 13px; }
.app-intro-section { padding: 36px 0; border-top: 1px solid var(--line); }
.app-intro-flow { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; }
.app-intro-flow p { margin: 0; color: var(--muted); }
.app-intro-flow .app-intro-step { margin-bottom: 12px; font-size: 22px; font-weight: 700; color: var(--accent); }
.app-intro-features { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px 48px; }
.app-intro-features article { padding-left: 18px; border-left: 3px solid var(--accent); }
.app-intro-features article:nth-child(3n) { border-color: var(--accent-2); }
.app-intro-features p { margin: 0; color: var(--muted); }
.app-intro-start { display: grid; grid-template-columns: minmax(0, 1fr) minmax(230px, 300px); gap: 48px; align-items: start; }
.app-intro-start ol { padding-left: 24px; line-height: 1.8; }
.app-intro-start li { margin-bottom: 14px; padding-left: 4px; }
.app-intro-start figure { margin: 0; }
.app-intro-start img { display: block; width: 100%; height: auto; border-radius: 8px; border: 1px solid var(--line); }
.app-intro-start figcaption { margin-top: 10px; color: var(--muted); font-size: 12px; line-height: 1.6; }
.app-intro-faq details { border-bottom: 1px solid var(--line); padding: 18px 0; }
.app-intro-faq summary { cursor: pointer; font-weight: 600; line-height: 1.6; }
.app-intro-faq details p { margin: 12px 0 0; color: var(--muted); max-width: 860px; }
.app-intro a:focus-visible, .app-intro summary:focus-visible { outline: 2px solid var(--focus); outline-offset: 4px; }
@media (max-width: 700px) {
  .app-intro h1 { font-size: 32px; }
  .app-intro h2 { font-size: 23px; }
  .app-intro-lead { font-size: 19px; }
  .app-intro-flow, .app-intro-features, .app-intro-start { grid-template-columns: minmax(0, 1fr); gap: 26px; }
  .app-intro-start figure { width: min(100%, 300px); margin: 0 auto; }
  .app-intro .actions a { max-width: 100%; white-space: normal; }
}