/* Carby's O-Chem — navigation & orientation (js/nav.js): nav groups, focus rings, section strip + hints,
   breadcrumbs, phone "More" sheet, Home "Your next step", Start here page */

/* ---------- accessibility basics ---------- */
.skip-link { position: absolute; left: 12px; top: -60px; z-index: 100; padding: 10px 16px; border: 0; border-radius: 12px; background: var(--brand); color: #fff; font-weight: 900; }
.skip-link:focus { top: 12px; }
a:focus-visible, button:focus-visible, summary:focus-visible, [tabindex]:focus-visible, input[type="checkbox"]:focus-visible, input[type="radio"]:focus-visible { outline: 3px solid var(--brand); outline-offset: 2px; border-radius: 10px; }
#view:focus, #view:focus-visible, #view h1:focus, #view h2:focus { outline: none; }
.search:focus-visible, .field input:focus-visible, .num-input:focus-visible { box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 35%, transparent); }

/* ---------- sidebar groups ---------- */
.nav .nav-group { margin: 12px 14px 2px; font-size: 11px; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; color: var(--ink2); opacity: .8; }
.nav .nav-group:first-child { margin-top: 0; }
.nav .nav-start { margin-top: 10px; border: 2px dashed var(--line); }
.nav .nav-start.active { border-style: solid; }
.sidebar { overflow-y: auto; overflow-x: hidden; scrollbar-width: thin; }

/* ---------- section strip: tagline or breadcrumbs + "How this works" ---------- */
#secbar { max-width: 1100px; width: 100%; margin: 0 auto; padding: 14px 28px 0; }
#secbar[hidden] { display: none; }
#secbar + #view { padding-top: 14px; }
.sec-row { display: flex; align-items: center; gap: 10px; min-height: 34px; }
.sec-tag { flex: 1; min-width: 0; margin: 0; font-size: 14px; color: var(--ink2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sec-tag b { color: var(--ink); }
.sec-help { flex: none; margin-left: auto; display: inline-flex; align-items: center; gap: 6px; padding: 5px 12px 5px 5px; border-radius: 99px; border: 2px solid var(--line); background: var(--panel); color: var(--ink2); font-weight: 800; font-size: 13px; }
.sec-help > span:first-child { width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; background: var(--soft); color: var(--brand); font-weight: 900; }
.sec-help:hover, .sec-help[aria-expanded="true"] { border-color: color-mix(in srgb, var(--brand) 45%, transparent); color: var(--brand); }
.sec-help[aria-expanded="true"] > span:first-child { background: var(--brand); color: #fff; }

.crumbs { flex: 1; min-width: 0; }
.crumbs ol { display: flex; flex-wrap: wrap; align-items: center; gap: 2px 6px; list-style: none; margin: 0; padding: 0; font-size: 14px; font-weight: 800; }
.crumbs li { display: flex; align-items: center; gap: 6px; min-width: 0; }
.crumbs li + li::before { content: '›'; color: var(--ink2); font-weight: 900; }
.crumbs a { color: var(--brand); text-decoration: none; padding: 2px 4px; border-radius: 8px; }
.crumbs a:hover { background: var(--soft); text-decoration: underline; }
.crumbs [aria-current] { color: var(--ink2); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 60vw; }

.sec-hint { display: grid; grid-template-columns: auto 1fr; gap: 14px; align-items: start; margin-top: 10px; padding: 14px 16px; border-radius: var(--radius); background: var(--soft); border: 2px solid color-mix(in srgb, var(--brand) 25%, var(--line)); animation: fadeUp .25s ease both; }
.sec-hint[hidden] { display: none; }
.sec-hint > svg { flex: none; }
.hn-body { min-width: 0; }
.hn-carby { margin: 0 0 8px; font-family: 'Patrick Hand', var(--font); font-size: 18px; line-height: 1.3; }
.sec-hint dl { margin: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px 16px; }
.sec-hint dt { font-size: 12px; font-weight: 900; letter-spacing: .06em; text-transform: uppercase; color: var(--brand); }
.sec-hint dd { margin: 2px 0 0; font-size: 14px; }
.hn-foot { margin-top: 10px; justify-content: flex-end; }

/* ---------- phone tab bar + More sheet ---------- */
.tabbar .tab-more { display: none; }
#more-root:empty { display: none; }
.more-back { position: fixed; inset: 0; z-index: 40; background: var(--scrim); animation: fadeIn .2s; }
.more-sheet { position: fixed; left: 0; right: 0; bottom: 0; z-index: 41; max-height: 85vh; overflow-y: auto; padding: 14px 16px calc(84px + env(safe-area-inset-bottom)); background: var(--bg2); border-top: 2px solid var(--line); border-radius: 22px 22px 0 0; box-shadow: var(--shadow); animation: sheetUp .22s ease both; }
.more-head { display: flex; align-items: center; justify-content: space-between; font-size: 18px; margin-bottom: 8px; }
.more-search { display: flex; align-items: center; gap: 8px; width: 100%; padding: 10px 14px; margin-bottom: 6px; border-radius: 14px; border: 2px solid var(--line); background: var(--panel); color: var(--ink2); font-weight: 800; text-align: left; }
.more-group { margin-top: 10px; }
.more-gt { font-size: 11px; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; color: var(--ink2); margin: 0 2px 6px; }
.more-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.more-grid a { display: flex; align-items: center; gap: 8px; min-width: 0; padding: 10px 12px; border-radius: 14px; border: 2px solid var(--line); background: var(--panel); color: var(--ink); font-weight: 800; font-size: 14px; text-decoration: none; line-height: 1.2; }
.more-grid a > span { font-size: 20px; flex: none; }
.more-grid a.on { border-color: var(--brand); color: var(--brand); background: var(--soft); }
.more-sheet #more-fb { margin-top: 14px; }
@keyframes sheetUp { from { transform: translateY(40px); opacity: 0; } to { transform: none; opacity: 1; } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

/* ---------- Home: your next step + jump-to strip ---------- */
.next-step { display: flex; align-items: center; gap: 18px; margin-top: 18px; text-decoration: none; color: var(--ink); border: 2px solid color-mix(in srgb, var(--brand) 45%, var(--line)); background: linear-gradient(135deg, color-mix(in srgb, var(--brand) 10%, var(--panel)), var(--panel) 70%); box-shadow: 0 5px 0 color-mix(in srgb, var(--brand) 30%, var(--line)); transition: transform .12s; }
.next-step:hover { transform: translateY(-2px); }
.next-step .ns-ico { font-size: 44px; line-height: 1; flex: none; }
.next-step .ns-body { flex: 1; min-width: 0; }
.next-step .ns-lbl { font-size: 12px; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; color: var(--brand); }
.next-step h2 { margin: 2px 0 4px; font-size: 22px; }
.next-step p { margin: 0; color: var(--ink2); }
.next-step .btn { flex: none; }
.home-start { margin: 10px 2px 0; font-size: 14px; color: var(--ink2); }
.jump { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.jump a { display: flex; align-items: center; gap: 10px; min-width: 0; padding: 12px 14px; border-radius: 16px; background: var(--panel); border: 2px solid var(--line); color: var(--ink); text-decoration: none; font-weight: 800; font-size: 14px; line-height: 1.25; }
.jump a:hover { border-color: color-mix(in srgb, var(--brand) 45%, var(--line)); }
.jump a > span:first-child { font-size: 24px; flex: none; }
.jump a > span:last-child { min-width: 0; overflow-wrap: anywhere; }
.jump small { display: block; font-weight: 600; color: var(--ink2); font-size: 12px; }

/* ---------- Start here ---------- */
.start { max-width: 980px; }
.start-h { margin: 28px 0 6px; }
.loop { list-style: none; padding: 0; margin: 12px 0 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; counter-reset: none; }
.loop li { display: flex; position: relative; }
.loop li + li::before { content: '→'; position: absolute; left: -12px; top: 50%; transform: translate(-50%, -50%); font-weight: 900; color: var(--brand); z-index: 1; }
.loop-step { position: relative; display: flex; flex-direction: column; gap: 4px; width: 100%; text-decoration: none; color: var(--ink); }
.loop-step:hover { border-color: color-mix(in srgb, var(--brand) 45%, var(--line)); }
.loop-step .muted { font-size: 14px; }
.loop-n { position: absolute; top: 10px; right: 12px; width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center; font-weight: 900; font-size: 13px; background: var(--brand); color: #fff; }
.start-next { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-top: 12px; }
.start-secs { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-top: 12px; }
.start-sec h3 { margin: 0; }
.start-sec h3 a { color: var(--ink); }
.start-sec .row { flex-wrap: nowrap; align-items: center; }
.start-sec .row p { margin: 0; font-size: 14px; }
.start-sec > p { margin: 8px 0 0; font-size: 15px; }
.start-tools { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin-top: 12px; }
.start-tool { display: flex; gap: 12px; align-items: flex-start; text-decoration: none; color: var(--ink); }
.start-tool p { margin: 2px 0 0; font-size: 14px; }
.start-teach p, .start-faq p { margin: 0 0 8px; }
.start-teach p:last-child, .start-faq p:last-child { margin: 0; }
.keys-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px 20px; }
.keys-group h3 { font-size: 15px; margin: 8px 0 4px; }
.keys-t td:first-child { white-space: nowrap; width: 1%; }
.keys-t kbd, .keys-grid kbd { display: inline-block; min-width: 1.6em; padding: 1px 6px; border-radius: 6px; border: 2px solid var(--line); border-bottom-width: 3px; background: var(--panel); font-family: var(--mono); font-size: 12px; text-align: center; }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .tabbar .tab-more { display: flex; flex-direction: column; align-items: center; border: 0; background: none; color: var(--ink2); font-size: 11px; font-weight: 800; padding: 4px 8px; border-radius: 12px; }
  .tabbar .tab-more .ico { font-size: 22px; }
  .tabbar .tab-more.active { color: var(--brand); background: var(--soft); }
  .tabbar a, .tabbar .tab-more { flex: 1 1 0; min-width: 0; }
  .tabbar a > span:last-child, .tabbar .tab-more > span:last-child { max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .tabbar a { position: relative; }
  .tabbar a .pill { position: absolute; top: 0; right: calc(50% - 22px); background: var(--red); color: #fff; font-size: 10px; border-radius: 99px; padding: 0 5px; line-height: 16px; }
  #secbar { padding: 12px 16px 0; }
  #secbar + #view { padding-top: 12px; }
  .sec-hint dl { grid-template-columns: 1fr; gap: 8px; }
  .jump { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .loop { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px 12px; }
  .loop li + li::before { display: none; }
  .start-secs, .start-tools { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .sec-help-l { display: none; }
  .sec-help { padding: 4px; }
  .sec-hint { grid-template-columns: 1fr; }
  .sec-hint > svg { display: none; }
  .next-step { flex-direction: column; align-items: flex-start; gap: 10px; }
  .next-step .ns-ico { font-size: 36px; }
  .next-step .btn { align-self: stretch; text-align: center; justify-content: center; }
  .hn-foot { justify-content: stretch; }
  .hn-foot > * { flex: 1 1 auto; text-align: center; justify-content: center; }
}
@media (max-width: 380px) {
  .loop { grid-template-columns: 1fr; }
  .jump a { padding: 10px; gap: 8px; font-size: 13px; }
  .tabbar a, .tabbar .tab-more { padding: 4px 2px; }
}
@media (prefers-reduced-motion: reduce) { .sec-hint, .more-sheet, .more-back { animation: none; } }
@media print { #secbar, #more-root, .skip-link { display: none !important; } }

/* Lectures page (#/lectures) */
.lec-hero { display: flex; align-items: center; gap: 18px; }
.lec-hero h1 { margin: 0 0 4px; }
.lec-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 14px; margin-top: 18px; }
.lec-card { border-left: 6px solid var(--c); display: flex; flex-direction: column; gap: 8px; }
.lec-top { display: flex; align-items: flex-start; gap: 12px; }
.lec-top h3 { margin: 0; }
.lec-top p { margin: 2px 0 0; font-size: 13.5px; }
.lec-top .lec-done { margin-left: auto; flex: none; }
.lec-ico { font-size: 34px; line-height: 1; }
.lec-chaps { margin: 0; padding-left: 1.3em; columns: 2 160px; font-size: 13.5px; color: var(--ink2); }
.lec-actions { gap: 8px; margin-top: auto; flex-wrap: wrap; }
.lec-soon { list-style: none; padding: 14px 18px; display: grid; gap: 6px; }
.lec-tip { margin-top: 14px; font-size: 13.5px; }
.map-links { display: flex; gap: 8px; flex-wrap: wrap; margin: 4px 0 8px; }
@media (max-width: 560px) { .lec-hero { flex-direction: column; text-align: center; } .lec-list { grid-template-columns: 1fr; } }