/* Quiet navigation with explicit destinations, not floating panels. */
.orbit-bottom{justify-content:center!important;bottom:22px!important;pointer-events:none}
.orbit-bottom[hidden],.nexus-intro-rail[hidden]{display:none!important}
.orbit-bottom .orbit-counter{position:absolute;left:0;bottom:8px}
.orbit-continue{display:flex;flex-direction:column;align-items:center;gap:4px;pointer-events:auto}
.orbit-continue>small{font-size:11px;color:var(--muted);letter-spacing:.02em}
.orbit-next{appearance:none;border:0;border-bottom:1px solid var(--accent);border-radius:0;background:transparent;color:var(--accent);font:inherit;font-size:16px;font-weight:600;display:flex;align-items:center;gap:20px;padding:8px 0;min-height:44px;cursor:pointer}
.orbit-next b{font-size:20px;font-weight:400}
.orbit-next.cue-arrive b{animation:intro-cue-down .85s ease-in-out 2}
.orbit-continue .orbit-skip{display:block;min-height:28px;padding:5px 8px;font-size:11px;line-height:18px;border:0;color:var(--muted)}
.orbit-continue .orbit-skip[hidden]{display:none}
.orbit-next:focus-visible,.orbit-continue .orbit-skip:focus-visible{outline:2px solid var(--accent);outline-offset:4px}
.intro-navigation-active .nexus-section-rail{opacity:0;visibility:hidden;pointer-events:none}
.nexus-intro-rail{position:fixed;right:15px;top:50%;transform:translateY(-50%);z-index:35;color:var(--accent)}
.intro-rail-caption{position:absolute;right:0;bottom:100%;font-size:11px;white-space:nowrap;background:var(--bg);padding:5px 8px;border-radius:4px}
.intro-rail-track{position:relative;display:grid;gap:0}
.intro-rail-track::before,.intro-rail-track::after{content:'';position:absolute;left:21px;top:22px;bottom:22px;width:1px;background:var(--line);pointer-events:none}
.intro-rail-track::after{background:var(--accent);transform-origin:top;transform:scaleY(var(--intro-progress,0));transition:transform .15s linear}
.nexus-intro-rail button{position:relative;width:44px;height:44px;padding:0;border:0;background:transparent;color:var(--muted);cursor:pointer;z-index:1}
.nexus-intro-rail button::after{content:'';position:absolute;width:7px;height:7px;border-radius:50%;background:var(--muted);left:18px;top:18px;transition:transform .2s,background .2s;box-shadow:0 0 0 5px var(--bg)}
.nexus-intro-rail button[aria-current]::after{background:var(--accent);transform:scale(1.55)}
.nexus-intro-rail button span{position:absolute;right:46px;top:12px;white-space:nowrap;background:var(--bg);padding:3px 8px;font-size:12px;opacity:0;pointer-events:none}
.nexus-intro-rail button:hover span,.nexus-intro-rail button:focus-visible span{opacity:1}
.nexus-intro-rail button:focus-visible{outline:2px solid var(--accent);border-radius:4px}
body:has(dialog[open]) .nexus-intro-rail{visibility:hidden}
@keyframes intro-cue-down{0%,100%{transform:translateY(0)}25%{transform:translateY(-3px)}75%{transform:translateY(3px)}}
@media(max-width:767px){.nexus-intro-rail{display:none}.orbit-bottom{left:16px!important;right:16px!important;bottom:16px!important}.orbit-bottom .orbit-counter{position:static;align-self:flex-end;white-space:nowrap;font-size:9px;padding-bottom:8px;margin-right:12px}.orbit-next{font-size:13px;gap:12px}.orbit-continue>small{font-size:10px}.orbit-continue .orbit-skip{font-size:10px}.orbit-continue{min-width:0}}
@media(max-height:560px){.nexus-intro-rail button{height:30px}.intro-rail-track::before,.intro-rail-track::after{top:15px;bottom:15px}.nexus-intro-rail button::after{top:12px}.orbit-continue>small{display:none}.orbit-bottom{bottom:10px!important}}
@media(prefers-reduced-motion:reduce){.orbit-next.cue-arrive b{animation:none}.intro-rail-track::after,.nexus-intro-rail button::after{transition:none}}
/* Fade the artwork under the cue so it remains legible in dense scenes. */
.orbit-bottom{z-index:30!important;isolation:isolate}
.orbit-bottom::before{content:'';position:absolute;inset:-22px -6vw -26px;z-index:-1;background:linear-gradient(transparent,var(--bg) 65%);pointer-events:none}
/* Shared foreground placement: portraits and binary particles never paint over the cue. */
body>.orbit-bottom{position:fixed;left:5%;right:5%;z-index:40!important}
.orbit-continue{padding:12px 22px 8px;position:relative}
body[data-navigation-style="fade"] .orbit-continue::before{content:'';position:absolute;inset:-24px -60px;z-index:-1;background:radial-gradient(ellipse,var(--bg) 45%,transparent 73%);pointer-events:none}
body[data-navigation-style="glass"] .orbit-continue{background:color-mix(in srgb,var(--bg) 94%,transparent);backdrop-filter:blur(18px);border:1px solid var(--line);border-radius:18px;box-shadow:0 8px 32px #071d2b0a}
body[data-navigation-style="solid"] .orbit-continue{background:var(--bg);border-radius:16px}
body[data-navigation-style="solid"] .orbit-next{background:var(--accent);color:var(--bg);border:0;border-radius:10px;padding:10px 18px}
.intro-style-options{position:fixed;top:100px;left:24px;z-index:90;padding:8px;max-width:calc(100vw - 48px);border:1px solid var(--line);border-radius:12px;background:var(--bg);box-shadow:0 5px 20px #071d2b12;display:flex;gap:6px;flex-wrap:wrap}
.intro-style-options legend{font-size:11px;color:var(--muted);padding:0 5px}
.intro-style-options button{font:inherit;font-size:12px;background:transparent;color:var(--ink);border:1px solid var(--line);padding:8px;border-radius:6px;cursor:pointer;min-height:36px}
.intro-style-options button[aria-pressed="true"]{background:var(--accent);color:var(--bg)}
@media(max-width:767px){.orbit-continue{padding:8px 10px 4px}.orbit-bottom .orbit-counter{margin-right:3px}.orbit-next{font-size:12px;gap:8px}.intro-style-options{top:80px;left:12px;max-width:calc(100vw - 24px)}body[data-navigation-style="solid"] .orbit-next{padding:8px 10px}}

/* Compact alternatives: one 44px action row, no stacked helper copy. */
.orbit-bottom::before{display:none}
.orbit-continue{flex-direction:row;gap:14px;padding:4px!important}
.orbit-continue>small{display:none}
.orbit-next{font-size:14px;min-height:44px;padding:6px 12px!important;gap:14px}
.orbit-continue .orbit-skip{font-size:11px;padding:8px 4px;min-height:44px;display:flex;align-items:center}
body[data-navigation-style] .orbit-continue{background:transparent;border:0;border-radius:0;box-shadow:none;backdrop-filter:none}
body[data-navigation-style="glass"] .orbit-next{background:var(--bg);border:1px solid var(--accent);border-radius:8px}
body[data-navigation-style="solid"] .orbit-next{border-radius:8px}
body[data-navigation-style="fade"] .orbit-continue::before{inset:-8px -18px}
.nexus-intro-rail,body .nexus-section-rail{right:15px;transition:opacity .35s ease,visibility .35s;opacity:1;visibility:visible}
.nexus-intro-rail.rail-out{opacity:0;visibility:hidden;pointer-events:none}
body .nexus-section-rail{gap:0}
body .nexus-section-rail a{width:44px;height:44px}
body .nexus-section-rail a::after{width:7px;height:7px;opacity:1;background:var(--muted);box-shadow:0 0 0 5px var(--bg);z-index:1}
body .nexus-section-rail a[aria-current]::after{width:11px;height:11px;border-radius:50%}
body .nexus-section-rail::before{content:'';position:absolute;left:21px;top:22px;bottom:22px;width:1px;background:var(--line)}
@media(max-width:767px){
 .orbit-continue{gap:7px;max-width:100%}
 .orbit-next{font-size:11px;gap:7px;padding:4px 9px!important}
 .orbit-continue .orbit-skip{font-size:9px}
 .orbit-bottom .orbit-counter{display:none}
}
@media(max-height:560px){body .nexus-section-rail a{height:30px}}
@media(prefers-reduced-motion:reduce){.nexus-intro-rail,body .nexus-section-rail{transition:none}}

/* Stable button footprint and centered secondary action. */
.orbit-continue{flex-direction:column;gap:2px;padding:0!important}
.orbit-next{width:260px;height:44px;min-height:44px;justify-content:center;box-sizing:border-box}
.orbit-continue .orbit-skip{justify-content:center;min-height:26px;height:26px;padding:2px 10px;box-sizing:border-box}
@media(max-width:767px){.orbit-next{width:210px;max-width:100%;font-size:12px}.orbit-continue{width:210px;max-width:100%}}

.orbit-next b{display:inline-flex;align-items:center;justify-content:center;line-height:1;height:24px;width:24px;flex-shrink:0}

/* Progress above; scene context below the introduction track. */
.intro-rail-caption{right:50%;transform:translateX(50%);margin:0 0 8px;padding:5px 0;background:transparent;font-variant-numeric:tabular-nums}
.intro-rail-scene{position:absolute;right:0;top:100%;margin:8px 0 0;padding:5px 8px;font-size:11px;line-height:1.4;white-space:nowrap;color:var(--accent);background:var(--bg);border-radius:4px}

/* Leave the artwork with a gradual handoff, not a disappearing action. */
.orbit-bottom{transition:opacity .25s ease}
.orbit-bottom.intro-controls-out{visibility:hidden;pointer-events:none}
.orbit-bottom.intro-controls-out .orbit-continue{pointer-events:none}
@media(prefers-reduced-motion:reduce){.orbit-bottom{transition:none}}