/* Mission menu hierarchy: recovery first, orbital flight second. */
#menu.menu {
  --menu-white: #fff;
  --menu-muted: #96969a;
  --menu-line: rgba(255,255,255,.22);
  --menu-dark: #08090b;
  display: block;
  padding: 106px clamp(24px,5vw,80px) 24px;
  overflow-y: auto;
  overscroll-behavior: contain;
  scroll-padding-top: 96px;
  color: var(--menu-white);
  font-family: -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  background: rgba(8,9,11,.93);
  backdrop-filter: none;
}
#menu .mission-menu-header,
#menu .mission-resume-bar,
#menu .mission-menu-layout { width: min(100%,1200px); margin: 0 auto; }
#menu .mission-menu-header { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; padding-bottom: 24px; }
#menu .eyebrow,
#menu .mission-section-label { color: var(--menu-muted); font-size: 9px; line-height: 1.5; font-weight: 400; letter-spacing: .16em; text-transform: uppercase; }
#menu .mission-menu-header h1 { margin: 9px 0 0; color: #fff; font-size: clamp(25px,2.6vw,34px); line-height: 1.25; font-weight: 500; letter-spacing: -.02em; }
#menu .mission-menu-header h1 span { display: inline; color: inherit; }
#menu .mission-menu-header > p { margin: 0 0 2px; color: #aaa; font-size: 11px; line-height: 1.8; text-align: right; }
#menu .mission-menu-header > p > span { display: block; color: #777; font-size: 9px; margin-top: 7px; }
#menu .mission-menu-layout { display: grid; grid-template-columns: minmax(0,2fr) minmax(270px,1fr); gap: 32px; align-items: stretch; }
#menu .mission-recovery-group,
#menu .mission-orbital-group { min-width: 0; margin: 0; padding-top: 22px; border-top: 1px solid var(--menu-line); }
#menu .mission-orbital-group { padding-left: 28px; border-left: 1px solid var(--menu-line); }
#menu .mission-section-heading { display: flex; gap: 12px; align-items: flex-start; margin: 0 0 22px; }
#menu .mission-section-number { color: #888; font: 12px/1.7 ui-monospace,SFMono-Regular,Consolas,monospace; padding-top: 3px; }
#menu .mission-section-heading h2 { margin: 0; color: #fff; font-size: 23px; line-height: 1.35; font-weight: 500; letter-spacing: .02em; }
#menu .mission-section-heading p { margin: 8px 0 0; color: #999; font-size: 11px; line-height: 1.7; }
#menu .mission-section-heading > small { margin-left: auto; padding-top: 9px; color: #777; font-size: 8px; letter-spacing: .13em; white-space: nowrap; }
#menu button,
#menu select,
#menu kbd,
#menu .key-icon { border-radius: 0; box-shadow: none; }
#menu button { transition: color .16s ease,background-color .16s ease,border-color .16s ease; }
#menu button:focus-visible,
#menu a:focus-visible,
#menu summary:focus-visible,
#menu select:focus-visible { outline: 2px solid #fff; outline-offset: 4px; }
#menu button:disabled { opacity: .45; cursor: wait; }
#menu kbd { border: 1px solid rgba(255,255,255,.3); background: transparent; color: #aaa; padding: 3px 6px; font: 10px/1.2 ui-monospace,SFMono-Regular,Consolas,monospace; font-weight: 400; }
#menu .mission-recovery-actions { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 10px; max-width: none; margin: 0; }
#menu .mission-recovery-actions button { display: flex; align-items: center; justify-content: space-between; gap: 14px; width: 100%; min-width: 0; min-height: 104px; margin: 0; padding: 18px; border: 1px solid #5c5c60; background: transparent; color: #fff; text-align: left; }
#menu .mission-recovery-actions button > span { display: block; }
#menu .mission-recovery-actions small { display: block; color: #999; font-size: 8px; line-height: 1.3; letter-spacing: .1em; }
#menu .mission-recovery-actions b { display: block; margin: 8px 0 5px; font-size: 19px; line-height: 1.3; letter-spacing: .02em; font-weight: 500; }
#menu .mission-recovery-actions em { display: block; color: #999; font-size: 10px; font-style: normal; line-height: 1.7; }
#menu .mission-recovery-actions kbd { flex-shrink: 0; min-width: 25px; padding: 5px 7px; text-align: center; margin: 0; color: #ccc; }
#menu .mission-recovery-actions .mission-entry-primary { grid-column: 1 / -1; min-height: 116px; padding: 20px 23px; background: #fff; border-color: #fff; color: #08090b; }
#menu .mission-recovery-actions .mission-entry-primary b { font-size: 25px; }
#menu .mission-recovery-actions .mission-entry-primary small,
#menu .mission-recovery-actions .mission-entry-primary em,
#menu .mission-recovery-actions .mission-entry-primary kbd { color: #555; }
#menu .mission-recovery-actions .mission-entry-primary kbd { border-color: #aaa; }
#menu .mission-recovery-actions button:hover:not(:disabled) { background: #fff; border-color: #fff; color: #08090b; }
#menu .mission-recovery-actions button:hover:not(:disabled) small,
#menu .mission-recovery-actions button:hover:not(:disabled) em,
#menu .mission-recovery-actions button:hover:not(:disabled) kbd { color: #555; }
#menu .mission-recovery-actions button:hover:not(:disabled) kbd { border-color: #aaa; }
#menu .glide-route-menu { display: grid; grid-template-columns: minmax(0,1fr) minmax(180px,.9fr); align-items: center; gap: 8px 24px; margin: 20px 0 0; padding: 16px 0 0; border: 0; border-top: 1px solid var(--menu-line); border-radius: 0; background: transparent; max-width: none; }
#menu .mission-route-choice { display: flex; flex-direction: column; align-items: stretch; gap: 11px; min-width: 0; }
#menu .mission-route-choice label { color: #fff; font-size: 11px; }
#menu .mission-route-choice label > span { margin-left: 10px; color: #888; font-size: 8px; letter-spacing: .1em; }
#menu .glide-route-menu select { width: 100%; min-width: 0; max-width: 100%; background: #08090b; border: 1px solid #666; color: #fff; padding: 10px 28px 10px 11px; font-family: inherit; font-size: 11px; line-height: 1.4; }
#menu #glide-route-preview { display: block; width: 100%; height: 90px; margin: 0; filter: grayscale(1); opacity: .9; }
#menu .glide-route-menu svg text { fill: #999; }
#menu .mission-route-description { grid-column: 1 / -1; margin: 0; }
#menu .mission-route-description > summary { justify-content: flex-start; padding: 2px 0 5px; color: #999; font-size: 10px; }
#menu .mission-route-description > summary::after { margin-left: 5px; font-size: 14px; }
#menu .glide-route-menu p { margin: 6px 0; color: #bbb; font-size: 11px; line-height: 1.85; }
#menu .glide-route-menu small { color: #888; font-size: 10px; line-height: 1.7; }
#menu .start-actions { display: flex; flex-wrap: wrap; gap: 8px; }
#menu .start-actions:empty { display: none; }
#menu .start-actions .primary,
#menu .start-actions .secondary,
#menu .mission-orbital-start { display: flex; flex: 1 1 180px; align-items: center; justify-content: space-between; gap: 14px; min-width: 0; min-height: 54px; padding: 15px 16px; border: 1px solid #777; background: transparent; color: #fff; font-size: 12px; font-weight: 500; text-align: left; }
#menu .mission-orbital-start { width: 100%; }
#menu .start-actions button:hover:not(:disabled),
#menu .mission-orbital-start:hover:not(:disabled) { background: #fff; color: #08090b; border-color: #fff; }
#menu .start-actions button:hover:not(:disabled) kbd { color: #08090b; border-color: #999; }
#menu .mission-orbital-secondary { display: grid; gap: 6px; margin: 10px 0 21px; }
#menu .mission-orbital-secondary .text-button { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 15px 16px; margin: 0; border: 1px solid #414145; background: transparent; color: #ddd; font-size: 12px; text-align: left; }
#menu .mission-orbital-secondary .text-button small { display: block; margin-top: 7px; color: #888; font-size: 8px; letter-spacing: .11em; }
#menu .mission-orbital-secondary .text-button:hover:not(:disabled) { border-color: #999; color: #fff; }
#menu details > summary { list-style: none; cursor: pointer; display: flex; align-items: center; justify-content: space-between; gap: 16px; color: #fff; }
#menu details > summary::-webkit-details-marker { display: none; }
#menu details > summary::after { content: "+"; margin-left: auto; color: #999; font-size: 17px; font-weight: 300; }
#menu details[open] > summary::after { content: "−"; }
#menu details > summary small { font-size: 9px; color: #888; letter-spacing: .06em; font-weight: 400; }
#menu .mission-orbital-options { border-top: 1px solid var(--menu-line); }
#menu .mission-orbital-options > summary { padding: 14px 0; font-size: 11px; }
#menu .difficulty-picker { margin: 2px 0 0; padding: 0; border: 0; min-width: 0; }
#menu .difficulty-picker legend { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; }
#menu .difficulty-options { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 7px; }
#menu .difficulty-options button { border: 1px solid #454549; background: transparent; color: #fff; padding: 11px; min-width: 0; }
#menu .difficulty-options button[aria-pressed="true"] { background: #fff; border-color: #fff; color: #08090b; box-shadow: none; }
#menu .difficulty-options small { color: #999; font-size: 9px; }
#menu .difficulty-options b { color: inherit; font-size: 14px; margin-top: 6px; }
#menu .difficulty-options em { color: #aaa; font-size: 9px; margin-top: 6px; }
#menu .difficulty-options button[aria-pressed="true"] small,
#menu .difficulty-options button[aria-pressed="true"] em,
#menu .difficulty-options button[aria-pressed="true"] kbd { color: #555; }
#menu .difficulty-options button[aria-pressed="true"] kbd { border-color: #aaa; }
#menu .difficulty-picker p { margin: 11px 0 0; color: #888; font-size: 10px; line-height: 1.8; }
#menu .mission-resume-bar { display: flex; align-items: center; justify-content: space-between; gap: 24px; margin-bottom: 24px; padding: 18px 20px; border: 1px solid #666; background: rgba(255,255,255,.035); }
#menu .mission-resume-bar h2 { margin: 7px 0 0; font-size: 16px; font-weight: 500; line-height: 1.5; }
#menu .mission-resume-bar .start-actions { flex: 0 1 440px; }
#menu .mission-resume-bar .primary { background: #fff; border-color: #fff; color: #08090b; }
#menu .mission-resume-bar .primary kbd { color: #555; border-color: #aaa; }
#menu .mission-menu-resources { display: grid; grid-template-columns: 1fr 1fr; gap: 0 36px; max-width: 1200px; margin: 26px auto 0; }
#menu .mission-guide-disclosure,
#menu .orbital-key-guide { margin: 0; padding: 0; border: 0; border-top: 1px solid var(--menu-line); }
#menu .mission-guide-disclosure > summary,
#menu .orbital-key-guide > summary { padding: 19px 0; color: #ccc; font-size: 12px; }
#menu .mission-menu-resources > details[open] { grid-column: 1 / -1; }
#menu .mission-menu-resources > details[open] > summary { border-bottom: 1px solid var(--menu-line); margin-bottom: 20px; }
#menu .return-handbook { max-width: none; margin: 0; border: 1px solid #333; border-radius: 0; box-shadow: none; background: rgba(8,9,11,.92); }
#menu .handbook-header { padding: 27px; }
#menu .handbook-header h2 { color: #fff; font-size: 28px; }
#menu .handbook-header p,
#menu .handbook-header .eyebrow { color: #999; }
#menu .handbook-tabs { background: transparent; border-color: #333; }
#menu .handbook-tabs button { color: #888; border-radius: 0; }
#menu .handbook-tabs button > span { color: #999; }
#menu .handbook-tabs button[aria-selected="true"] { color: #fff; border-color: #fff; background: rgba(255,255,255,.04); }
#menu .handbook-tabs button[aria-selected="true"] > span { color: #fff; }
#menu .handbook-tabs button:hover { background: rgba(255,255,255,.06); }
#menu .handbook-stage figure { border-radius: 0; border-color: #333; background: #08090b; }
#menu .handbook-stage figure img { filter: grayscale(1); }
#menu .handbook-stage figcaption { color: #999; border-color: #333; }
#menu .handbook-goal { border-color: #fff; }
#menu .handbook-goal span,
#menu .handbook-steps li,
#menu .handbook-columns p,
#menu .handbook-columns p.handbook-note,
#menu .handbook-keys dd,
#menu .handbook-detail p,
#menu .handbook-modes dd,
#menu .handbook-footer p { color: #aaa; }
#menu .handbook-goal strong,
#menu .handbook-steps b,
#menu .handbook-steps li::before,
#menu .return-handbook h3,
#menu .handbook-modes dt { color: #eee; }
#menu .handbook-columns,
#menu .handbook-modes,
#menu .handbook-modes dl > div { border-color: #333; }
#menu .handbook-detail { background: transparent; border-color: #333; border-radius: 0; }
#menu .handbook-detail summary,
#menu .handbook-detail[open] summary { color: #ddd; }
#menu .handbook-detail th,
#menu .handbook-detail td { color: #aaa; border-color: #333; }
#menu .handbook-detail caption,
#menu .handbook-detail tbody th { color: #eee; }
#menu .handbook-detail thead th { color: #999; }
#menu .handbook-gates > div,
#menu .handbook-gates > div + div { background: transparent; border-color: #444; border-radius: 0; }
#menu .handbook-gates b,
#menu .handbook-gates > div + div b { color: #fff; }
#menu .handbook-gates span,
#menu .handbook-gates p,
#menu .handbook-gates i,
#menu .handbook-modes h3 small { color: #999; }
#menu .handbook-important { background: rgba(255,255,255,.04); color: #ccc; border-color: #aaa; }
#menu .handbook-footer { background: transparent; border-color: #333; border-radius: 0; }
#menu .handbook-footer > div { color: #aaa; }
#menu .mission-guide-more { margin: 16px 0 24px; }
#menu .return-menu-note { color: #999; font-size: 11px; line-height: 1.85; }
#menu .reentry-source-link { color: #bbb; font-size: 11px; text-underline-offset: 4px; }
#menu .control-primer { grid-template-columns: repeat(3,minmax(0,1fr)); gap: 24px; margin: 24px 0; }
#menu .control-primer > div { align-items: flex-start; }
#menu .key-icon { background: transparent; border-color: #555; color: #ddd; }
#menu .control-primer b { color: #eee; font-size: 12px; }
#menu .control-primer small { color: #999; font-size: 10px; line-height: 1.7; }
#menu .extra-keys { grid-template-columns: repeat(3,minmax(0,1fr)); gap: 15px 26px; margin: 0 0 24px; color: #aaa; font-size: 11px; }
#menu .assist-note { color: #888; font-size: 10px; margin: 0 0 24px; }
#menu .menu-bottom { position: static; left: auto; right: auto; bottom: auto; max-width: 1200px; margin: 24px auto 0; padding-top: 18px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 14px 24px; border-top: 1px solid var(--menu-line); color: #777; font-size: 9px; line-height: 1.8; letter-spacing: .12em; }
#menu .menu-bottom a { color: #999; text-underline-offset: 4px; }
#menu .menu-bottom i { color: #666; margin: 0 7px; font-style: normal; }
@media (max-width: 1050px) {
  #menu.menu { padding: 100px 28px 24px; }
  #menu .mission-menu-layout { grid-template-columns: minmax(0,1.7fr) minmax(250px,1fr); gap: 23px; }
  #menu .mission-orbital-group { padding-left: 22px; }
  #menu .mission-section-heading > small { display: none; }
  #menu .mission-recovery-actions button { padding: 16px; }
  #menu .control-primer { grid-template-columns: 1fr; gap: 20px; }
  #menu .extra-keys { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 760px) {
  #menu.menu { padding: 88px 22px 24px; }
  #menu .mission-menu-header { align-items: flex-start; padding-bottom: 22px; gap: 16px; }
  #menu .mission-menu-header > p { max-width: 160px; font-size: 10px; }
  #menu .mission-menu-layout { grid-template-columns: 1fr; gap: 26px; }
  #menu .mission-orbital-group { padding-left: 0; border-left: 0; }
  #menu .mission-section-heading { margin-bottom: 18px; }
  #menu .mission-section-heading h2 { font-size: 21px; }
  #menu .mission-recovery-actions button { min-height: 104px; }
  #menu .mission-recovery-actions .mission-entry-primary { min-height: 110px; }
  #menu .difficulty-options { grid-template-columns: repeat(4,minmax(0,1fr)); }
  #menu .mission-resume-bar { align-items: stretch; flex-direction: column; gap: 15px; padding: 17px; }
  #menu .mission-resume-bar .start-actions { flex: auto; }
  #menu .mission-menu-resources { grid-template-columns: 1fr; gap: 0; margin-top: 28px; }
  #menu .mission-menu-resources > details[open] { grid-column: auto; }
  #menu .handbook-header { padding: 20px; }
  #menu .handbook-header h2 { font-size: 24px; }
  #menu .handbook-columns,#menu .handbook-gates { grid-template-columns: 1fr; }
  #menu .handbook-stage,#menu .handbook-footer { padding: 18px; }
  #menu .menu-bottom { display: flex; margin-top: 17px; font-size: 8px; }
}
@media (max-width: 420px) {
  #menu.menu { padding-left: 18px; padding-right: 18px; }
  #menu .mission-menu-header { flex-direction: column; gap: 10px; }
  #menu .mission-menu-header > p { max-width: none; text-align: left; }
  #menu .mission-menu-header > p > span { display: none; }
  #menu .mission-recovery-actions { grid-template-columns: 1fr; }
  #menu .mission-recovery-actions button { min-height: 92px; }
  #menu .glide-route-menu { grid-template-columns: 1fr; }
  #menu #glide-route-preview { height: 90px; }
  #menu .difficulty-options { grid-template-columns: repeat(2,minmax(0,1fr)); }
  #menu .extra-keys { grid-template-columns: 1fr; }
  #menu .mission-guide-disclosure > summary small { display: none; }
  #menu .handbook-tabs b { font-size: 12px; }
}
@media (prefers-reduced-motion: reduce) {
  #menu button { transition: none; }
}

/* Three destinations: full missions, progressive lessons, and free setup. */
#menu .home-sections { display:flex; gap:6px; width:min(100%,1200px); margin:0 auto 28px; padding:0; border-bottom:1px solid var(--menu-line); }
#menu .home-sections button { position:relative; min-width:142px; padding:15px 24px 18px; border:0; background:transparent; color:#777; text-align:left; }
#menu .home-sections button > span { display:block; font-size:19px; line-height:1.4; }
#menu .home-sections button > small { display:block; margin-top:6px; color:#777; font-size:8px; letter-spacing:.16em; }
#menu .home-sections button[aria-selected="true"] { color:#fff; }
#menu .home-sections button[aria-selected="true"]::after { content:""; position:absolute; left:24px; right:24px; bottom:-1px; height:2px; background:#fff; }
#menu .home-sections button:hover { color:#fff; background:rgba(255,255,255,.035); }
#menu .home-section-panel { max-width:1200px; margin:0 auto; }
#menu .home-section-panel[hidden] { display:none!important; }
#menu #home-panel-missions .mission-recovery-group,#menu #home-panel-missions .mission-orbital-group { border-top:0; padding-top:0; }
#menu .training-intro { display:flex; align-items:flex-end; justify-content:space-between; gap:24px; margin-bottom:24px; }
#menu .training-intro h2,#menu .home-custom-layout h2 { margin:8px 0 10px; color:#fff; font-size:clamp(24px,2.7vw,32px); font-weight:500; line-height:1.35; }
#menu .training-intro p,#menu .home-custom-layout p { margin:0; color:#aaa; font-size:12px; line-height:1.9; }
#menu .training-intro > p { max-width:235px; font-size:10px; text-align:right; }
#menu .training-free-practice { margin-top:28px; border-top:1px solid var(--menu-line); }
#menu .training-free-practice > summary { padding:19px 0; color:#bbb; font-size:13px; }
#menu .training-free-practice .mission-recovery-actions { grid-template-columns:repeat(3,minmax(0,1fr)); margin-bottom:12px; }
#menu .home-custom-layout { display:grid; grid-template-columns:minmax(0,1.2fr) minmax(300px,.8fr); gap:70px; align-items:center; min-height:285px; }
#menu .home-custom-layout ol { padding-left:20px; color:#aaa; font-size:12px; line-height:2.5; }
#menu .home-custom-layout .mission-recovery-actions { display:block; }
#menu .home-custom-layout #custom-practice-btn { min-height:165px; padding:28px; border-color:#ddd; }
#menu .home-custom-layout #custom-practice-btn b { font-size:26px; margin:15px 0; }
#menu .home-custom-layout #custom-practice-btn > span:last-child { font-size:32px; font-weight:200; }
@media(max-width:760px){
 #menu .home-sections { gap:0; margin-bottom:24px; }
 #menu .home-sections button { flex:1; min-width:0; padding:12px 14px 16px; }
 #menu .home-sections button > span { font-size:17px; }
 #menu .home-sections button[aria-selected="true"]::after { left:14px; right:14px; }
 #menu .training-intro { align-items:flex-start; flex-direction:column; gap:10px; }
 #menu .training-intro > p { text-align:left; max-width:none; }
 #menu .training-free-practice .mission-recovery-actions { grid-template-columns:1fr; }
 #menu .home-custom-layout { grid-template-columns:1fr; gap:20px; }
}