/* Вводный экран «Как работает программа» (2.0.7). */
.onboarding { position: fixed; inset: 0; z-index: 200; display: flex; align-items: center; justify-content: center;
  padding: 20px; background: rgba(4, 8, 15, 0.72); backdrop-filter: blur(4px); }
.onboarding[hidden] { display: none; }
.onboarding__box { width: min(720px, 100%); max-height: min(86vh, 860px); overflow-y: auto; overscroll-behavior: contain;
  background: var(--surface); border: 1px solid var(--border-strong); border-radius: var(--radius-lg);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.45); }
.onboarding__head { display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 22px 26px 0; }
.onboarding__head h2 { margin: 0; font-size: 21px; letter-spacing: -0.3px; }
.onboarding__body { padding: 6px 26px 10px; color: var(--text-muted); font-size: 14px; line-height: 1.65; }
.onboarding__body h3 { color: var(--text); font-size: 15px; margin: 20px 0 8px; display: flex; gap: 9px; align-items: baseline; }
.onboarding__body h3 .num { color: var(--accent); font-family: 'JetBrains Mono', monospace; font-size: 13px; }
.onboarding__body ul, .onboarding__body ol { margin: 6px 0; padding-left: 20px; }
.onboarding__body li { margin: 4px 0; }
.onboarding__body b { color: var(--text); }
.onboarding__steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 10px 0 4px; }
.onboarding__step { background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 12px 14px; font-size: 13px; }
.onboarding__step b { display: block; margin-bottom: 4px; }
.onboarding__foot { display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap;
  padding: 14px 26px 22px; border-top: 1px solid var(--border); position: sticky; bottom: 0; background: var(--surface); }
.onboarding__foot .muted { color: var(--text-faint); font-size: 12px; }
@media (max-width: 640px) {
  .onboarding { padding: 10px; align-items: flex-end; }
  .onboarding__steps { grid-template-columns: 1fr; }
  .onboarding__head, .onboarding__body, .onboarding__foot { padding-left: 18px; padding-right: 18px; }
}