/* Standalone welcome route. Existing reader typography and figure classes are shared. */
.onboarding-pending #app { visibility: hidden; }
#onboarding[hidden] { display: none; }
#onboarding { position: fixed; inset: 0; z-index: 100; overflow-y: auto; background: var(--bg); color: var(--fg); overscroll-behavior: contain; }
.onboarding-shell { max-width: 1020px; margin: auto; padding: 24px 32px 64px; }
.onboarding-shell.is-map { --node-size: clamp(48px, 8svh, 72px); position: relative; box-sizing: border-box; min-height: 100svh; display: flex; flex-direction: column; padding: 96px 32px; }
.is-map .onboarding-top { position: absolute; top: 24px; right: 32px; justify-content: flex-end; border-bottom: 0; }
.onboarding-top { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding-bottom: 20px; border-bottom: 1px solid var(--line); }
.onboarding-top [data-skip] { padding: 0 4px; white-space: nowrap; font-size: 12px; border-radius: 6px; }
.onboarding-brand { color: var(--fg-dim); font-size: 14px; }
.onboarding-brand span { color: var(--accent); margin-right: 10px; }
.onboarding-skip { font: inherit; font-size: 13px; background: transparent; color: var(--fg-dim); border: 1px solid var(--line); border-radius: 8px; padding: 10px 14px; cursor: pointer; }
.onboarding-intro { margin: 28px 0 24px; }
.onboarding-intro h1 { font-size: clamp(25px, 4vw, 34px); margin: 8px 0 10px; }
.onboarding-intro p { color: var(--fg-dim); font-size: 14px; line-height: 1.8; margin: 6px 0; }
.onboarding-status { font-size: 13px; color: var(--fg-dim); margin: 12px 0; }
.onboarding-route { display: flex; flex-direction: column-reverse; align-items: stretch; gap: 20px; list-style: none; width: var(--node-size); margin: auto; padding: 0; }
.onboarding-route li { height: var(--node-size); min-width: 0; position: relative; }
.onboarding-route li:not(:last-child)::after { content: ''; position: absolute; bottom: calc(100% - var(--node-size) / 2); left: calc(var(--node-size) / 2 - 1px); width: 2px; height: calc(100% + 20px); background: var(--line); }
.onboarding-route li.is-read::after { background: var(--accent); }
.onboarding-route button { position: relative; z-index: 1; display: grid; grid-template-columns: var(--node-size) 1fr; align-items: center; gap: 24px; text-align: left; width: 100%; border: 0; padding: 0; background: transparent; color: var(--fg); font: inherit; cursor: pointer; }
.onboarding-dot { position: relative; display: block; width: var(--node-size); height: var(--node-size); border-radius: 50%; background: var(--bg); }
.onboarding-face, .onboarding-ring, .onboarding-ring-spin { position: absolute; inset: 0; display: block; width: 100%; height: 100%; }
.onboarding-face { clip-path: circle(38%); }
.onboarding-ring { transition: scale .16s ease-out; }
.onboarding-ring-spin { mask-image: radial-gradient(circle closest-side, transparent 80%, #000 80%); }
.onboarding-hover-band { position: absolute; inset: 7.5%; box-sizing: border-box; border: calc(var(--node-size) * .045) solid white; border-radius: 50%; opacity: 0; transition: opacity .16s ease-out; }
.onboarding-dot.is-hovered .onboarding-ring { scale: 1.18; }
.onboarding-dot.is-hovered .onboarding-hover-band { opacity: 1; }
@media (prefers-reduced-motion: reduce) { .onboarding-ring, .onboarding-hover-band { transition: none; } }
.onboarding-node-name { position: absolute; left: calc(100% + 24px); white-space: nowrap; font-size: 17px; }
.onboarding-node-status { color: var(--fg-dim); font-size: 12px; }
.onboarding-route button:disabled { cursor: default; }
.onboarding-map-hint { text-align: center; color: var(--fg-dim); font-size: 14px; line-height: 1.9; margin-bottom: 60px; }
.onboarding-reader-nav { margin: 24px 0; }
@media (max-width: 760px) {
  .onboarding-shell.is-map { --node-size: clamp(48px, 7svh, 56px); }
  .is-map .onboarding-top { top: 16px; right: 14px; }
  .onboarding-node-name { align-self: center; }
  .onboarding-node-status { align-self: start; }
  .onboarding-map-hint { margin: 0 0 28px; }
}
.onboarding-reader { max-width: 780px; margin: 0 auto; padding: 28px 28px 20px; border: 1px solid var(--line); border-radius: 14px; background: var(--bg-panel); }
.onboarding-reader .dd-h1 { font-size: clamp(23px, 3vw, 30px); line-height: 1.5; }
.onboarding-reader .dd-sec { margin-top: 28px; }
.onboarding-reader .dd-sec p, .onboarding-reader .dd-sec li { font-size: 16px; line-height: 1.9; }
.onboarding-reader .dd-sec h2 { font-size: 20px; }
.onboarding-reader .dd-fig svg { width: 100%; max-width: 610px; }
.onboarding-reader .dd-fig figcaption { font-size: 13px; }
.onboarding-reader .dd-thesis { font-size: 15px; }
.onboarding-example { margin: 16px 0; padding: 16px; border: 1px solid var(--line); border-radius: 8px; line-height: 1.85; color: var(--fg); background: var(--bg); }
.onboarding-example p:last-child { margin-bottom: 0; }
.onboarding-reader details { border: 1px solid var(--line); border-radius: 8px; padding: 14px; margin: 24px 0; }
.onboarding-reader summary { cursor: pointer; color: var(--accent); line-height: 1.7; }
.onboarding-reader details p { font-size: 15px; line-height: 1.85; color: var(--fg-dim); }
.onboarding-footer { display: flex; align-items: center; gap: 16px; justify-content: space-between; margin-top: 28px; padding-top: 22px; border-top: 1px solid var(--line); }
.onboarding-next, .onboarding-prev { border: 1px solid var(--line); border-radius: 8px; padding: 12px 18px; font: inherit; font-size: 14px; cursor: pointer; }
.onboarding-next { background: var(--accent); color: #101822; font-weight: 650; }
.onboarding-prev { background: transparent; color: var(--fg-dim); }
.onboarding-prev:disabled { opacity: .4; cursor: default; }
.onboarding-reader .dd-src { font-size: 13px; line-height: 1.8; margin-top: 24px; }
.onboarding-storage { color: #e4b85d; font-size: 13px; line-height: 1.8; }
#onboarding :focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
#onboarding h1:focus, #onboarding h2:focus { outline: none; }
.onboarding-fallback { font-size: 13px; color: var(--fg-dim); }
@media (max-width: 620px) {
  /* The legacy mobile header hid all actions, including the way back to this guide. */
  #topbar { flex-wrap: wrap; height: auto; padding: 8px 12px; gap: 8px; }
  #topbar .search-wrap { order: 2; flex-basis: 100%; max-width: none; }
  #topbar .topbar-actions { display: flex; order: 3; flex-basis: 100%; flex-wrap: wrap; gap: 8px; }
  #topbar .topbar-actions #btn-settings,
  #topbar .topbar-actions #btn-reset:not(.hidden) { display: inline-flex; align-items: center; }
}
@media (max-width: 600px) {
  .onboarding-shell { padding: 16px 14px 36px; }
  .onboarding-top { align-items: flex-start; }
  .onboarding-brand { max-width: 100px; line-height: 1.7; }
  .onboarding-skip { max-width: 200px; line-height: 1.5; padding: 9px; }
  .onboarding-reader { padding: 20px 16px; }
  .onboarding-footer { gap: 8px; }
  .onboarding-next, .onboarding-prev { padding: 12px; }
}