/* ============================================================
   ORBIT SHELL — the generic pattern extracted from Spirit Level.
   Everything here is content-agnostic. Accent colors arrive at
   runtime via --accent / --deep set per item by the engine.
   ============================================================ */

:root{
  --accent:#e0673a; --deep:#c44a35; --glow:rgba(224,103,58,0.45);
  --bg0:#15100b; --bg1:#1f1610; --shell-edge:#261a11;
  --ink:#f3e7d8; --ink-dim:#b9a489; --ink-faint:#7d6a52; --bright:#f3e7d8;
  --serif:'Cormorant Garamond',Georgia,serif; --sans:'Inter',system-ui,sans-serif;
  --line:rgba(243,231,216,0.10);
  --base:#080604; --panel:rgba(243,231,216,0.045); --panel-faint:rgba(243,231,216,0.015);
  --btn:rgba(18,12,8,0.55); --btn-h:rgba(18,12,8,0.8);
  --dot:rgba(243,231,216,0.22); --dot-h:rgba(243,231,216,0.5); --vig:rgba(0,0,0,0.55);
  --spring:cubic-bezier(.34,1.56,.64,1); --ease:cubic-bezier(.4,0,.2,1);
  --silk:cubic-bezier(.22,1,.36,1);
}
/* light theme: warm paper */
body.light{
  --bg0:#f3ecdd; --bg1:#ece2ce; --shell-edge:#e8d8ba;
  --ink:#4a3a26; --ink-dim:#7c6a50; --ink-faint:#a08e74; --bright:#2a1d0e;
  --line:rgba(74,52,26,0.16);
  --base:#c9bca3; --panel:rgba(74,52,26,0.055); --panel-faint:rgba(74,52,26,0.02);
  --btn:rgba(255,251,243,0.6); --btn-h:rgba(255,251,243,0.85);
  --dot:rgba(74,52,26,0.24); --dot-h:rgba(74,52,26,0.5); --vig:rgba(150,118,74,0.13);
}
body.light .os-aura b{mix-blend-mode:multiply;opacity:.16}

*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
.ic{display:block;width:24px;height:24px;flex:none}
html,body{height:100%}
body{font-family:var(--sans);background:var(--base);min-height:100vh;display:flex;align-items:center;justify-content:center;
  padding:20px 12px;color:var(--ink);transition:background .6s var(--ease)}

/* ---------- the shell frame ---------- */
.os-phone{--safe-top:env(safe-area-inset-top,0px);width:393px;max-width:100%;height:852px;max-height:96vh;position:relative;overflow:hidden;overflow:clip;border-radius:46px; /* Δ clip: the frame can never be scrolled programmatically (focus/scrollIntoView used to shift the whole app) */
  background:radial-gradient(135% 78% at 50% -8%, color-mix(in srgb, var(--accent) 22%, var(--shell-edge)) 0%, var(--bg1) 46%, var(--bg0) 100%);
  box-shadow:0 50px 110px -34px rgba(0,0,0,0.9), inset 0 0 0 1px rgba(255,235,205,0.06);
  transition:background 1.4s var(--ease)}

/* living atmosphere */
.os-aura{position:absolute;inset:-30%;z-index:0;pointer-events:none;filter:blur(46px);opacity:.9}
.os-aura b{position:absolute;border-radius:50%;mix-blend-mode:screen;opacity:.5;transition:background 1.4s var(--ease)}
.os-aura .a1{width:340px;height:340px;top:-8%;left:-14%;background:radial-gradient(circle,var(--accent),transparent 66%);animation:os-drift1 22s ease-in-out infinite}
.os-aura .a2{width:300px;height:300px;bottom:2%;right:-18%;background:radial-gradient(circle,var(--deep),transparent 64%);animation:os-drift2 27s ease-in-out infinite}
.os-aura .a3{width:240px;height:240px;top:42%;left:30%;background:radial-gradient(circle,var(--accent),transparent 70%);opacity:.32;animation:os-drift3 31s ease-in-out infinite}
@keyframes os-drift1{0%,100%{transform:translate(0,0) scale(1)}50%{transform:translate(34px,46px) scale(1.12)}}
@keyframes os-drift2{0%,100%{transform:translate(0,0) scale(1.05)}50%{transform:translate(-40px,-30px) scale(.92)}}
@keyframes os-drift3{0%,100%{transform:translate(0,0)}33%{transform:translate(30px,-26px)}66%{transform:translate(-24px,20px)}}

.os-grain{position:absolute;inset:0;z-index:6;pointer-events:none;opacity:.05;mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  animation:os-grain 7s steps(6) infinite}
@keyframes os-grain{0%{transform:translate(0,0)}20%{transform:translate(-4%,3%)}40%{transform:translate(3%,-4%)}60%{transform:translate(-3%,2%)}80%{transform:translate(4%,3%)}100%{transform:translate(0,0)}}
.os-vignette{position:absolute;inset:0;z-index:5;pointer-events:none;border-radius:46px;
  box-shadow:inset 0 0 130px 30px var(--vig);transition:box-shadow .6s var(--ease)}

.os-app{position:absolute;inset:0;z-index:7;display:flex;flex-direction:column;padding:calc(var(--safe-top,0px) + 26px) 24px 18px}
.os-scene{flex:1;min-height:0;display:flex;flex-direction:column;overflow-x:hidden;overflow-y:auto;scrollbar-width:none;
  scroll-padding-top:calc(var(--safe-top,0px) + 92px);
  transition:opacity .42s var(--ease), transform .52s var(--silk), filter .42s var(--ease)}
.os-scene::-webkit-scrollbar{display:none}
.os-scene.out-up{opacity:0;transform:translateY(-26px);filter:blur(7px)}
.os-scene.out-down{opacity:0;transform:translateY(26px);filter:blur(7px)}
.os-scene.drawer-open{padding-bottom:60vh}

/* ---------- top rail: big index numeral (the nav) ---------- */
.os-rail{position:absolute;top:calc(var(--safe-top,0px) + 18px);left:28px;z-index:9;pointer-events:none}
.os-idx{font-family:var(--serif);font-weight:500;font-size:74px;line-height:.84;color:var(--accent);white-space:nowrap;display:block;
  text-shadow:0 2px 34px var(--glow);pointer-events:auto;cursor:pointer;-webkit-user-select:none;user-select:none;
  transition:color .8s var(--ease),transform .3s var(--spring)}
.os-idx:active{transform:scale(.92)}

/* item picker (press-hold the index) */
.os-pick{position:absolute;top:calc(var(--safe-top,0px) + 14px);left:20px;z-index:20;display:flex;flex-direction:column;gap:1px;padding:8px;border-radius:16px;
  background:color-mix(in srgb,var(--accent) 10%, rgba(14,9,6,0.97));border:1px solid color-mix(in srgb,var(--accent) 26%,transparent);backdrop-filter:blur(12px);
  opacity:0;transform:translateY(-8px) scale(.95);transform-origin:top left;pointer-events:none;
  transition:opacity .3s var(--ease),transform .35s var(--silk);box-shadow:0 22px 54px -20px rgba(0,0,0,.75);
  max-height:70vh;overflow-y:auto;scrollbar-width:none}
.os-pick.on{opacity:1;transform:translateY(0) scale(1);pointer-events:auto}
.os-pick .ci{display:flex;align-items:center;gap:11px;padding:8px 16px 8px 10px;border-radius:10px;cursor:pointer;transition:background .25s var(--ease)}
.os-pick .ci:hover,.os-pick .ci.cur{background:rgba(243,231,216,0.07)}
.os-pick .ci .cnum{font-family:var(--serif);font-size:14px;color:var(--ink-faint);width:14px;text-align:center}
.os-pick .ci .dot{width:11px;height:11px;border-radius:50%;flex:none;box-shadow:0 0 9px currentColor}
.os-pick .ci .cn{font-family:var(--serif);font-size:16px;color:var(--ink-dim);transition:color .25s}
.os-pick .ci.cur .cn,.os-pick .ci:hover .cn{color:var(--bright)}

/* optional top-right mark (module-supplied action, e.g. mode toggle) */
.os-corner{position:absolute;top:calc(var(--safe-top,0px) + 34px);right:27px;height:58px;z-index:9;cursor:pointer;color:var(--accent);opacity:.78;
  display:flex;align-items:center;justify-content:center;
  transition:transform .4s var(--spring),opacity .4s var(--ease),filter .5s var(--ease)}
.os-corner svg{height:52px;width:auto;display:block;overflow:visible;fill:currentColor}
.os-corner:hover{opacity:.98;transform:scale(1.05)}
.os-corner:active{transform:scale(.95)}
.os-corner.on{opacity:1;filter:drop-shadow(0 0 9px var(--glow))}

/* light / dark toggle — tiny + subtle, top center */
@keyframes os-themeWink{0%{transform:translateX(-50%) scale(1) rotate(0);opacity:.6}
  26%{transform:translateX(-50%) scale(1.32) rotate(11deg);opacity:1;color:var(--accent)}
  56%{transform:translateX(-50%) scale(.95) rotate(-5deg)}
  100%{transform:translateX(-50%) scale(1) rotate(0);opacity:.6}}
.os-themetog{position:absolute;top:calc(var(--safe-top,0px) + 19px);left:50%;transform:translateX(-50%);z-index:10;cursor:pointer;
  color:var(--ink-faint);opacity:.6;display:flex;align-items:center;justify-content:center;
  transition:opacity .35s var(--ease),color .35s var(--ease),transform .4s var(--spring)}
.os-themetog.wink{animation:os-themeWink 1.3s var(--spring)}
.os-themetog svg{width:25px;height:25px;display:block}
.os-themetog:hover{opacity:1;color:var(--accent);transform:translateX(-50%) scale(1.12) rotate(8deg);animation:none}
.os-themetog:active{transform:translateX(-50%) scale(.9)}

/* scrim under the fixed header */
.os-hscrim{position:absolute;top:0;left:0;right:0;height:calc(var(--safe-top,0px) + 104px);z-index:8;pointer-events:none;
  background:linear-gradient(180deg, var(--bg0) 0%, color-mix(in srgb,var(--bg0) 62%, transparent) 54%, transparent 100%);
  -webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);
  -webkit-mask-image:linear-gradient(180deg,#000 0%,#000 50%,transparent 100%);mask-image:linear-gradient(180deg,#000 0%,#000 50%,transparent 100%)}

/* ---------- constellation: title ▸ hero ▸ subtitle, controls on an orbit ---------- */
.os-constel{position:relative;height:462px;flex:none;margin-top:12px} /* Δ flex:none — a tall drawer used to squash the constellation to 0 */
.os-title{position:absolute;top:calc(var(--safe-top,0px) + 44px);left:0;right:0;text-align:center;z-index:9;pointer-events:none;padding:0 92px;
  font-family:var(--serif);font-size:31px;line-height:1;color:var(--bright);letter-spacing:.02em;
  transition:opacity .28s var(--ease),filter .28s var(--ease),color .6s}
.os-title.swap{opacity:0;filter:blur(6px)}
@keyframes os-titleBeat{0%{opacity:.4;text-shadow:0 0 0 transparent}26%{opacity:1;text-shadow:0 2px 30px var(--glow)}68%{opacity:1}100%{opacity:.4;text-shadow:0 0 0 transparent}}
.os-title.beating{animation:os-titleBeat var(--beat-ms,2000ms) ease-in-out}
.os-sub{position:absolute;top:var(--sub-top,262px);left:0;right:0;text-align:center;z-index:5;
  font-size:14px;font-weight:500;letter-spacing:.42em;text-transform:uppercase;color:var(--ink-dim);
  transition:opacity .24s var(--ease),filter .24s var(--ease),color .6s}
.os-sub.swap{opacity:0;filter:blur(5px)}

/* the circle the controls sit on */
.os-orbitline{position:absolute;width:var(--orbit-d,300px);height:var(--orbit-d,300px);border-radius:50%;border:1px solid var(--accent);
  left:var(--orbit-cx,50%);top:var(--orbit-cy,244px);transform:translate(-50%,-50%);opacity:.16;pointer-events:none;z-index:1;
  transition:opacity .6s var(--ease)}
.os-orbitline.flash{animation:os-orbitFlash 1.9s var(--ease)}
@keyframes os-orbitFlash{0%{opacity:.07}20%{opacity:.5}100%{opacity:.07}}

/* progress ring riding the same circle (session countdown, playback, anything 0–1) */
.os-ring{position:absolute;width:var(--orbit-d,300px);height:var(--orbit-d,300px);left:var(--orbit-cx,50%);top:var(--orbit-cy,244px);
  transform:translate(-50%,-50%);pointer-events:none;z-index:1;opacity:0;transition:opacity .9s var(--ease)}
.os-ring.on{opacity:.55}
.os-ring circle{fill:none;stroke:var(--accent);stroke-width:.7;stroke-linecap:round;
  transform-box:fill-box;transform-origin:center;transform:rotate(-90deg);
  transition:stroke-dashoffset 1s linear,stroke .8s var(--ease)}

/* ---------- hero slot: the module's centerpiece lives here ---------- */
.os-hero{position:absolute;top:var(--hero-top,66px);left:50%;transform:translateX(-50%);width:208px;height:208px;
  display:flex;justify-content:center;align-items:center;z-index:3}
.os-hero .os-corona{position:absolute;top:50%;left:50%;width:300px;height:300px;transform:translate(-50%,-50%);border-radius:50%;
  background:radial-gradient(circle,var(--glow),transparent 62%);opacity:.5;pointer-events:none;
  animation:os-corona 10s ease-in-out infinite;transition:background 1.2s var(--ease)}
@keyframes os-corona{0%,100%{opacity:.32;transform:translate(-50%,-50%) scale(.9)}50%{opacity:.6;transform:translate(-50%,-50%) scale(1.08)}}
.os-hero .os-heromount{position:relative;z-index:2;width:236px;height:236px;display:flex;align-items:center;justify-content:center}
.os-hero .os-heromount svg{width:100%;height:100%;display:block;overflow:visible}
.os-breathe{transform-origin:center;animation:os-breathe 10s ease-in-out infinite}
@keyframes os-breathe{0%,100%{transform:scale(0.94)}50%{transform:scale(1.07)}}
.os-rotor{transform-origin:center;animation:os-spin 90s linear infinite}
@keyframes os-spin{to{transform:rotate(360deg)}}
.os-ripple{position:absolute;top:50%;left:50%;width:224px;height:224px;transform:translate(-50%,-50%);border-radius:50%;
  border:1px solid var(--accent);opacity:0;pointer-events:none;z-index:1}
.os-ripple.go{animation:os-ripp 2.6s var(--ease)}
@keyframes os-ripp{0%{opacity:.7;transform:translate(-50%,-50%) scale(.7)}100%{opacity:0;transform:translate(-50%,-50%) scale(1.5)}}

/* ---------- orbit controls (left/top set by the engine) ---------- */
.os-orbit{position:absolute;inset:0;z-index:6}
.os-ctrl{position:absolute;display:flex;flex-direction:column;align-items:center;gap:7px;cursor:pointer;transform:translate(-50%,0)}
.os-cbtn{width:56px;height:56px;border-radius:50%;border:1px solid var(--line);background:var(--btn);backdrop-filter:blur(7px);
  display:flex;align-items:center;justify-content:center;color:var(--accent);position:relative;
  transition:transform .34s var(--spring), border-color .4s, background .4s, color .4s}
.os-ctrl:hover .os-cbtn{transform:translateY(-4px) scale(1.08);border-color:color-mix(in srgb,var(--accent) 55%,transparent);background:var(--btn-h)}
.os-ctrl:active .os-cbtn{transform:scale(.9)}
.os-cbtn .ic{width:24px;height:24px}
.os-cbtn .sd{font-family:var(--serif);font-size:24px;color:var(--accent)}
.os-clab{font-size:8px;letter-spacing:.2em;text-transform:uppercase;color:var(--ink-faint);transition:color .4s}
.os-ctrl:hover .os-clab{color:var(--ink-dim)}
.os-cbtn.act{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 22%,transparent);color:var(--bright)}
.os-cbtn.looping{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 22%,transparent);color:var(--bright);
  animation:os-pulse 1.6s ease-in-out infinite}
@keyframes os-pulse{0%,100%{box-shadow:0 0 0 0 var(--glow)}50%{box-shadow:0 0 22px 3px var(--glow)}}

/* ---------- sliders dock (unfolds when active) ---------- */
.os-sliders{display:grid;grid-template-rows:0fr;opacity:0;transition:grid-template-rows .5s var(--silk),opacity .4s var(--ease),margin .4s var(--ease);margin-top:0;
  --sl-track:var(--line);--sl-fill:color-mix(in srgb,var(--ink-faint) 58%,transparent)}
.os-sliders.on{grid-template-rows:1fr;opacity:1;margin-top:10px}
.os-slr-inner{overflow:hidden;display:flex;flex-direction:column;gap:14px;padding:8px 10px 4px}
.os-slr{display:flex;align-items:center;gap:14px;--sl-accent:var(--accent);--sl-glow:var(--glow)}
.os-slr-ic{color:var(--sl-accent);width:22px;display:flex;align-items:center;justify-content:center;flex:none;opacity:.92;transition:color .8s var(--ease)}
.os-slr-ic .ic{width:19px;height:19px}
.os-slr-ic .sd{font-family:var(--serif);font-size:19px;color:var(--sl-accent);line-height:1}
.os-slr input[type=range]{-webkit-appearance:none;appearance:none;flex:1;height:2px;border-radius:2px;outline:none;cursor:pointer;background:var(--sl-track)}
.os-slr input[type=range]::-webkit-slider-runnable-track{height:2px;border-radius:2px}
.os-slr input[type=range]::-moz-range-track{height:2px;border-radius:2px;background:var(--sl-track);border:none}
.os-slr input[type=range]::-moz-range-progress{height:2px;border-radius:2px;background:var(--sl-fill)}
.os-slr input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:14px;height:14px;border-radius:50%;background:var(--sl-accent);cursor:pointer;margin-top:-6px;
  box-shadow:0 0 10px -1px var(--sl-glow);transition:transform .2s var(--spring),background .8s var(--ease)}
.os-slr input[type=range]::-webkit-slider-thumb:hover{transform:scale(1.25)}
.os-slr input[type=range]::-moz-range-thumb{width:14px;height:14px;border:none;border-radius:50%;background:var(--sl-accent);cursor:pointer;
  box-shadow:0 0 10px -1px var(--sl-glow)}
/* chip row variant (segmented choices inside the dock) */
.os-chips{display:flex;gap:7px;flex:1}
.os-chips button{flex:1;font-family:var(--sans);font-size:11px;letter-spacing:.06em;color:var(--ink-dim);background:transparent;
  border:1px solid var(--line);border-radius:999px;padding:7px 0;cursor:pointer;transition:all .28s var(--spring)}
.os-chips button:hover{transform:translateY(-1px);color:var(--bright)}
.os-chips button.on{background:color-mix(in srgb,var(--accent) 18%,transparent);border-color:var(--accent);color:var(--bright)}

/* ---------- explore: paired tiles, full-width drawer under each pair ---------- */
.os-explore{margin-top:14px;display:flex;flex-direction:column;border-top:1px solid var(--line)}
.os-prow{position:relative;border-bottom:1px solid var(--line);opacity:0;transform:translateY(12px);animation:os-rowIn .6s var(--silk) forwards;scroll-margin-top:14px}
@keyframes os-rowIn{to{opacity:1;transform:translateY(0)}}
.os-ptiles{display:grid;grid-template-columns:1fr 1fr}
.os-ptiles.single{grid-template-columns:1fr}
.os-tile{position:relative;display:flex;align-items:center;gap:12px;padding:16px 8px 15px 14px;cursor:pointer;transition:background .35s var(--ease)}
.os-tile + .os-tile{box-shadow:inset 1px 0 0 var(--line)}
.os-tile .ico{color:var(--accent);width:24px;display:flex;align-items:center;justify-content:center;flex:none;transition:transform .4s var(--spring)}
.os-tile .ico .ic{width:22px;height:22px}
.os-tile .word{font-family:var(--serif);font-size:21px;line-height:1.05;color:var(--ink-dim);transition:color .35s}
.os-tile:hover .word{color:var(--bright)}
.os-tile:hover .ico{transform:scale(1.14)}
.os-tile.active{background:color-mix(in srgb,var(--accent) 17%, transparent)}
.os-tile.active .word{color:var(--bright)}
.os-tile.active .ico{transform:scale(1.42)}
.os-pbody{display:grid;grid-template-rows:0fr;transition:grid-template-rows .55s var(--silk)}
.os-prow.open .os-pbody{grid-template-rows:1fr}
.os-pbodyinner{overflow:hidden}
.os-pbodywrap{position:relative;min-height:272px;display:flex;flex-direction:column;justify-content:center;text-align:center;
  padding:34px 24px 40px;overflow:hidden;border-top:1px solid var(--line);
  background:linear-gradient(180deg, color-mix(in srgb,var(--accent) 9%, var(--panel)) 0%, var(--panel-faint) 62%, var(--panel-faint) 100%)}
.os-prow.open .os-pbodywrap{box-shadow:inset 0 -1px 0 var(--line)}
.os-jb{display:flex;flex-direction:column;align-items:center}
.os-jb.sR{animation:os-slideInR .44s var(--silk)}
.os-jb.sL{animation:os-slideInL .44s var(--silk)}
@keyframes os-slideInR{0%{opacity:0;transform:translateX(48px)}100%{opacity:1;transform:translateX(0)}}
@keyframes os-slideInL{0%{opacity:0;transform:translateX(-48px)}100%{opacity:1;transform:translateX(0)}}
/* journal typography for drawer content */
.os-jb .eyebrow{font-size:10px;letter-spacing:.3em;text-transform:uppercase;color:var(--ink-faint);margin-bottom:16px}
.os-jb .jico{color:var(--accent);opacity:.92;margin-bottom:15px}
.os-jb .jico .ic{width:30px;height:30px}
.os-jb .lead{font-family:var(--serif);font-size:27px;line-height:1.34;color:var(--bright);font-weight:500;letter-spacing:.005em}
.os-jb .lead.sm{font-size:21px;line-height:1.4}
.os-jb .quote{font-family:var(--serif);font-style:italic;font-size:17px;line-height:1.4;color:var(--accent);margin-top:18px}
.os-jb .sub{font-size:12.5px;line-height:1.7;color:var(--ink-dim);margin-top:15px;max-width:300px}
.os-jb .meta-row{display:flex;justify-content:center;margin-top:22px;gap:8px;flex-wrap:wrap}
.os-jb .chip{font-size:10.5px;letter-spacing:.04em;color:var(--ink-dim);background:var(--panel);border:1px solid var(--line);border-radius:999px;padding:7px 13px}
.os-jb .chip b{color:var(--accent);font-weight:500}
.os-jb .seg{display:flex;gap:7px;margin:0 auto 22px;max-width:300px;width:100%}
.os-jb .seg button{flex:1;font-size:12px;color:var(--ink-dim);background:transparent;border:1px solid var(--line);border-radius:999px;padding:9px 0;cursor:pointer;transition:all .28s var(--spring)}
.os-jb .seg button:hover{transform:translateY(-2px)}
.os-jb .seg button.on{background:color-mix(in srgb,var(--accent) 18%,transparent);border-color:var(--accent);color:var(--bright)}

/* ---------- side spine: progress dots ---------- */
.os-spinewrap{position:absolute;right:6px;top:37%;transform:translateY(-50%);display:flex;flex-direction:column;align-items:center;gap:14px;z-index:8}
.os-spine{position:relative;display:flex;flex-direction:column;align-items:center}
.os-thread{position:absolute;top:10px;bottom:10px;width:1px;background:linear-gradient(180deg,transparent,var(--line),transparent);z-index:0}
.os-thread .fill{position:absolute;left:0;right:0;bottom:0;background:linear-gradient(180deg,transparent,var(--accent));transition:height .6s var(--silk);box-shadow:0 0 8px var(--glow)}
.os-node{width:26px;height:34px;display:flex;align-items:center;justify-content:center;cursor:pointer;position:relative;z-index:1}
.os-node .d{width:7px;height:7px;border-radius:50%;background:var(--dot);transition:all .45s var(--spring)}
.os-node.on .d{width:13px;height:13px;background:var(--accent);box-shadow:0 0 16px 3px var(--glow)}
.os-node:hover .d{transform:scale(1.5);background:var(--dot-h)}
.os-node.beat .d{transform:scale(1.8)}

/* ---------- side carousel arrows ---------- */
.os-carr{position:absolute;top:var(--carr-top,280px);transform:translateY(-50%);z-index:9;width:34px;height:52px;display:flex;align-items:center;justify-content:center;
  cursor:pointer;color:var(--ink-faint);opacity:.46;border:none;background:transparent;padding:0;
  transition:opacity .32s var(--ease),color .32s var(--ease),transform .35s var(--spring)}
.os-carr .ic{width:21px;height:21px}
.os-carr-l{left:3px}.os-carr-r{right:3px}
.os-carr:hover{opacity:.95;color:var(--accent)}
.os-carr:active{transform:translateY(-50%) scale(.88)}

/* quiet sign-off slot */
.os-tag{display:flex;justify-content:center;padding:26px 0 18px;opacity:.3;transition:opacity .3s var(--ease)}
.os-tag:hover{opacity:1}

/* ---------- real mobile: fill the screen ---------- */
@media (max-width:520px){
  body{padding:0;align-items:stretch;justify-content:stretch}
  .os-phone{width:100vw;height:100vh;height:100dvh;max-width:none;max-height:none;border-radius:0;box-shadow:none}
  .os-vignette{border-radius:0}
}
@media (prefers-reduced-motion: reduce){
  *{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.12s!important}
}

/* ============================================================
   Δ ORBIT SHELL DELTAS (2026-09-04) — additive, default-off.
   Justified by two consumers: ritual (immersion during a running
   session; arrows hidden while locked) and Mantrakosha (one-item
   chambers such as Gayatri have no use for arrows/spine).
   ============================================================ */
/* nav visibility — set via config.nav or shell.nav(part,on) */
.os-phone.os-hide-numeral .os-rail{display:none}
.os-phone.os-hide-arrows .os-carr{display:none}
.os-phone.os-hide-spine .os-spinewrap{display:none}
.os-phone.os-hide-theme .os-themetog{display:none}

/* immersion — the interface disappears; hero, title, sub, ring, and the
   module's own captions stay. Fades like light (1.2s), not like a repaint. */
.os-phone .os-orbit,.os-phone .os-sliders,.os-phone .os-explore,.os-phone .os-spinewrap,
.os-phone .os-carr,.os-phone .os-rail,.os-phone .os-themetog,.os-phone .os-corner,.os-phone .os-tag{
  transition:opacity 1.2s var(--ease),transform 1.2s var(--silk),filter 1.2s var(--ease)}
.os-phone.os-immersed .os-orbit,.os-phone.os-immersed .os-sliders,.os-phone.os-immersed .os-explore,
.os-phone.os-immersed .os-spinewrap,.os-phone.os-immersed .os-carr,.os-phone.os-immersed .os-rail,
.os-phone.os-immersed .os-themetog,.os-phone.os-immersed .os-corner,.os-phone.os-immersed .os-tag{
  opacity:0;pointer-events:none;filter:blur(4px)}
.os-phone.os-immersed .os-explore{transform:translateY(18px)}
.os-phone.os-immersed .os-hscrim{opacity:0;transition:opacity 1.2s var(--ease)}
.os-phone.os-immersed .os-scene{overflow-y:hidden}
/* a tap while immersed brings the chrome back briefly (the engine toggles .os-peek) */
.os-phone.os-immersed.os-peek .os-orbit,.os-phone.os-immersed.os-peek .os-rail,.os-phone.os-immersed.os-peek .os-sliders,
.os-phone.os-immersed.os-peek .os-corner,.os-phone.os-immersed.os-peek .os-themetog{
  opacity:1;pointer-events:auto;filter:none;transition-duration:.4s}
/* locked: the numeral stops inviting taps */
.os-phone.os-locked .os-idx{cursor:default;pointer-events:none}
.os-phone.os-locked .os-node{cursor:default}