/* ============================================================================
   ND OS  ·  the back-end shell  ·  Accelerated Experiences LLC · Sep 2026
   Phone first, and not a tab bar. A floating glass dock that sits off the
   bottom edge, a pill that slides to whatever room you are in, one raised
   button for the thing this room is actually for, and a sheet for the rest.
   Front-of-house (/nd/) keeps its flat bar. This is the back.
   ========================================================================== */

:root{
  --os-glass:rgba(38,32,27,.82);
  --os-glass-2:rgba(34,29,24,.92);
  --os-line:rgba(243,238,229,.2);
  --os-on:#FBF7EF;
  --os-off:rgba(243,238,229,.72);
  --os-lift:0 22px 50px -16px rgba(22,18,15,.78),0 1px 0 rgba(255,255,255,.14) inset;
  --os-spring:cubic-bezier(.34,1.46,.44,1);
}

/* room gets out of the dock's way */
body.nd-os{padding-bottom:calc(112px + env(safe-area-inset-bottom,0px))}

/* ---- the dock ------------------------------------------------------------ */
.nd-dock{
  position:fixed;z-index:120;left:14px;right:14px;
  bottom:calc(14px + env(safe-area-inset-bottom,0px));
  max-width:480px;margin-inline:auto;height:64px;
  border-radius:24px;border:1px solid var(--os-line);
  background:linear-gradient(180deg,rgba(62,53,45,.9),var(--os-glass));
  -webkit-backdrop-filter:blur(30px) saturate(185%);backdrop-filter:blur(30px) saturate(185%);
  box-shadow:var(--os-lift);
  display:grid;grid-template-columns:repeat(5,1fr);align-items:center;
  padding:0 6px;
  transition:transform .32s var(--os-spring),opacity .22s;
}
.nd-dock.hide{transform:translateY(130%);opacity:0;pointer-events:none}

/* the pill that chases the active room */
.nd-dock .glide{
  position:absolute;top:7px;height:50px;border-radius:17px;
  background:rgba(243,238,229,.17);
  box-shadow:0 0 0 1px rgba(243,238,229,.13) inset,0 1px 0 rgba(255,255,255,.14) inset;
  transition:transform .42s var(--os-spring),width .42s var(--os-spring),opacity .2s;
  pointer-events:none;opacity:0;
}
.nd-dock.ready .glide{opacity:1}

.nd-dock button,.nd-dock a{
  position:relative;z-index:1;-webkit-appearance:none;appearance:none;
  background:none;border:0;padding:0;margin:0;cursor:pointer;text-decoration:none;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;
  height:58px;color:var(--os-off);font:700 9.5px/1 "Karla","Helvetica Neue",Arial,sans-serif;
  letter-spacing:.055em;text-transform:uppercase;
  -webkit-tap-highlight-color:transparent;
  transition:color .22s,transform .2s var(--os-spring);
}
.nd-dock button:active,.nd-dock a:active{transform:scale(.9)}
.nd-dock .on{color:var(--os-on)}
.nd-dock svg{width:22px;height:22px;fill:currentColor;stroke:none;
  transition:transform .3s var(--os-spring)}
.nd-dock svg .b{opacity:.5}
.nd-dock .on svg .b{opacity:.72}
.nd-dock .on svg{transform:translateY(-1px) scale(1.06)}

/* the one raised button — whatever this room is for */
.nd-dock .prime{
  width:58px;height:58px;border-radius:20px;justify-self:center;gap:0;
  transform:translateY(-16px);
  background:linear-gradient(160deg,#CE6733,#A44A21);
  color:#FDF8EF;box-shadow:0 12px 26px -8px rgba(164,74,33,.72),
    0 1px 0 rgba(255,255,255,.28) inset;
  border:1px solid rgba(255,255,255,.14);
}
.nd-dock .prime svg{width:24px;height:24px}
.nd-dock .prime:active{transform:translateY(-16px) scale(.92)}
.nd-dock .prime[disabled]{opacity:.45;box-shadow:none}
.nd-dock .prime .spin{animation:ndspin .9s linear infinite;transform-origin:50% 50%}
@keyframes ndspin{to{transform:rotate(360deg)}}

/* ---- the sheet ----------------------------------------------------------- */
.nd-scrim{position:fixed;inset:0;z-index:118;background:rgba(32,27,23,.42);
  -webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);
  opacity:0;pointer-events:none;transition:opacity .26s}
.nd-scrim.up{opacity:1;pointer-events:auto}

.nd-sheet{
  position:fixed;z-index:119;left:10px;right:10px;
  bottom:calc(10px + env(safe-area-inset-bottom,0px));
  max-width:480px;margin-inline:auto;
  border-radius:28px;border:1px solid var(--os-line);
  background:var(--os-glass-2);
  -webkit-backdrop-filter:blur(30px) saturate(170%);backdrop-filter:blur(30px) saturate(170%);
  box-shadow:var(--os-lift);
  padding:10px 12px calc(16px + env(safe-area-inset-bottom,0px));
  transform:translateY(120%);transition:transform .4s var(--os-spring);
}
.nd-sheet.up{transform:translateY(0)}
.nd-sheet .grip{width:38px;height:4px;border-radius:99px;background:rgba(243,238,229,.28);
  margin:2px auto 12px}
.nd-sheet h3{font:700 10.5px/1 "Karla",Arial,sans-serif;letter-spacing:.17em;text-transform:uppercase;
  color:var(--os-off);margin:2px 0 10px 8px}
.nd-sheet .rooms{display:grid;grid-template-columns:repeat(4,1fr);gap:4px}
.nd-sheet a.soon .art{filter:grayscale(.75)}
.nd-sheet a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;
  padding:12px 4px;border-radius:18px;text-decoration:none;color:var(--os-off);
  font:600 10px/1.1 "Karla",Arial,sans-serif;letter-spacing:.04em;text-align:center;
  -webkit-tap-highlight-color:transparent;transition:background .2s,color .2s,transform .2s var(--os-spring)}
.nd-sheet a:active{transform:scale(.93)}
.nd-sheet a:hover{background:rgba(243,238,229,.1);color:var(--os-on)}
.nd-sheet a.soon{opacity:.5}
.nd-sheet a.soon:after{content:"soon";display:block;font-size:8.5px;letter-spacing:.12em;
  text-transform:uppercase;color:var(--os-off);margin-top:-3px}
.nd-sheet .art{width:50px;height:50px;border-radius:14px;display:block;
  box-shadow:0 6px 16px -8px rgba(0,0,0,.8)}
.nd-sheet svg{width:20px;height:20px;fill:currentColor;stroke:none}
.nd-sheet .sheethead{display:flex;align-items:center;gap:10px}
.nd-sheet .sheethead h3{flex:1;margin:2px 0 10px 8px}
.nd-sheet .lamp{-webkit-appearance:none;appearance:none;background:none;border:0;cursor:pointer;
  width:42px;height:42px;border-radius:13px;color:var(--os-off);margin:-4px 2px 6px 0;
  display:flex;align-items:center;justify-content:center;
  -webkit-tap-highlight-color:transparent;
  transition:background .2s,color .2s,transform .3s var(--os-spring)}
.nd-sheet .lamp:hover{background:rgba(243,238,229,.1);color:var(--os-on)}
.nd-sheet .lamp:active{transform:scale(.88) rotate(28deg)}
.nd-sheet .out{display:block;margin:12px 8px 0;padding:11px;border-radius:14px;text-align:center;
  color:var(--os-off);font:700 11px/1 "Karla",Arial,sans-serif;letter-spacing:.14em;
  text-transform:uppercase;border:1px solid var(--os-line);text-decoration:none}

/* a toast that lands above the dock instead of pushing the page around */
.nd-toast{position:fixed;z-index:121;left:14px;right:14px;
  bottom:calc(92px + env(safe-area-inset-bottom,0px));max-width:420px;margin-inline:auto;
  background:var(--os-glass-2);border:1px solid var(--os-line);border-radius:15px;
  -webkit-backdrop-filter:blur(22px);backdrop-filter:blur(22px);
  box-shadow:var(--os-lift);color:var(--os-on);
  font:600 13.5px/1.35 "Karla",Arial,sans-serif;padding:12px 15px;
  transform:translateY(16px) scale(.97);opacity:0;pointer-events:none;
  transition:transform .3s var(--os-spring),opacity .24s}
.nd-toast.up{transform:none;opacity:1}
.nd-toast.bad{color:#FFD9C6;border-color:rgba(206,103,51,.5)}

@media(min-width:760px){
  .nd-dock{height:66px}
  .nd-sheet .rooms{grid-template-columns:repeat(4,1fr)}
}
@media(prefers-reduced-motion:reduce){
  .nd-dock,.nd-dock *,.nd-sheet,.nd-scrim,.nd-toast{transition:none!important;animation:none!important}
}

/* ============================================================================
   DARK  ·  the back end only
   The front of house stays light — classroom pastels, his call, not up for
   debate. This file is loaded by the OS rooms and nowhere else, so nothing here
   can reach /nd/. She works at night; the OS opens dark and remembers.
   ========================================================================== */
html[data-os-theme="dark"]{
  --nd-paper:#1C1917; --nd-paper-2:#262120; --nd-card:#241F1C;
  --nd-field:#191512;
  --nd-tan:#5C4C3E; --nd-sage:#6F7F59; --nd-sage-d:#A8B78C;
  --nd-terra:#D2703E; --nd-terra-d:#EB9061;
  --nd-ink:#F0E9DD; --nd-ink-2:#AFA495;
  --nd-rule:#37302B; --nd-rule-soft:#2B2522;
  --nd-ruling-a:#2B2521; --nd-ruling-b:#211C19;
  --nd-on-sage:#1B2214; --nd-on-tan:#241E18; --nd-on-terra:#1B120C;
  --nd-shadow:0 1px 0 rgba(0,0,0,.3),0 16px 34px -22px rgba(0,0,0,.95);
  color-scheme:dark;
}
/* a solid terracotta button wants light text, not the dark ink the tokens give
   the rest of the dark theme */
html[data-os-theme="dark"] .btn.solid,
html[data-os-theme="dark"] .btn:hover{color:#1C1412}
html[data-os-theme="dark"] .d.on{color:#1C1412}
/* the illustrated art is bright on a dark sheet; take the edge off it */
html[data-os-theme="dark"] .nd-sheet .art{filter:brightness(.94) saturate(.92)}