/* glen-design: v1 */
/* ============================================================================
   Shell: rail, top bar, tab bar, the Day and Night switch, the mini orb, the
   AI edge light, overlays (drawer, sheet, palette, tray), toasts, boot, tour,
   and the theme transition itself.
   ========================================================================== */

.ic{ width: 20px; height: 20px; flex: none; }

.shell{
  display: grid; min-height: 100dvh;
  grid-template-columns: var(--rail-w) minmax(0, 1fr);
  grid-template-rows: var(--topbar-h) minmax(0, 1fr);
  grid-template-areas: "rail top" "rail view";
}
.rail{ grid-area: rail; }
.topbar{ grid-area: top; }
.view{ grid-area: view; outline: none; min-width: 0; position: relative; }

/* --- RAIL ---------------------------------------------------------------- */
.rail{
  position: sticky; top: 0; height: 100dvh; display: flex; flex-direction: column; gap: var(--s4);
  padding: var(--s4) var(--s3); z-index: 20;
  background: var(--mat-chrome); -webkit-backdrop-filter: var(--mat-blur); backdrop-filter: var(--mat-blur);
  box-shadow: inset -1px 0 0 var(--line);
}
.rail-brand{ display: flex; align-items: center; gap: var(--s3); padding: var(--s1) var(--s2); color: var(--ink); text-decoration: none; border-radius: var(--r); }
.rail-logo{ width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center; flex: none; overflow: hidden;
  background: var(--surface-1); box-shadow: var(--shadow-1), var(--ring); }
.rail-logo img, .rail-logo svg{ width: 30px; height: 30px; }
.rail-name{ display: grid; line-height: 1.2; min-width: 0; }
.rail-name b{ font: 700 var(--fs-base)/1.2 var(--font-display); letter-spacing: -.01em; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.rail-name small{ font-size: var(--fs-micro); color: var(--ink-dim); }
.rail-nav{ display: grid; gap: 2px; overflow: auto; scrollbar-width: none; min-height: 0; }
.rail-nav::-webkit-scrollbar{ display: none; }
.rail-nav.dense{ gap: 0; } .rail-nav.dense .nav-item{ min-height: 33px; } .rail-nav.dense .nav-group{ padding-top: var(--s2); }
.rail-nav.more-below{ -webkit-mask-image: linear-gradient(180deg, var(--mask) calc(100% - 20px), transparent); mask-image: linear-gradient(180deg, var(--mask) calc(100% - 20px), transparent); }
.rail-nav.more-above{ -webkit-mask-image: linear-gradient(0deg, var(--mask) calc(100% - 28px), transparent); mask-image: linear-gradient(0deg, var(--mask) calc(100% - 28px), transparent); }
.rail-nav.more-above.more-below{ -webkit-mask-image: linear-gradient(180deg, transparent, var(--mask) 28px, var(--mask) calc(100% - 20px), transparent); mask-image: linear-gradient(180deg, transparent, var(--mask) 28px, var(--mask) calc(100% - 20px), transparent); }
.nav-group{ padding: var(--s3) var(--s3) var(--s1); font-size: var(--fs-micro); font-weight: 600; color: var(--ink-faint); }
.nav-group:first-child{ padding-top: 0; }
.nav-item{
  position: relative; display: flex; align-items: center; gap: var(--s3); min-height: 36px; padding: 0 var(--s3);
  border-radius: var(--r-sm); color: var(--ink-dim); text-decoration: none; font-weight: 600; font-size: var(--fs-base);
  transition: background var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out), transform var(--dur-instant) var(--ease-out);
}
.nav-item .nl{ flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.nav-item .ic{ flex: none; transition: transform var(--dur-base) var(--ease-out); }
.nav-item .nav-badge{ margin-left: auto; min-width: 22px; height: 20px; padding: 0 6px; border-radius: var(--r-pill); display: grid; place-items: center;
  font: 500 var(--fs-micro)/1 var(--font-mono); background: var(--surface-3); color: var(--ink-dim); }
.nav-item .nav-badge.hot{ background: var(--bad); color: var(--on-accent); }
.nav-item[aria-current="page"]{ color: var(--ink); background: var(--surface-1); box-shadow: var(--shadow-1), var(--ring); }
.nav-item[aria-current="page"] .ic{ color: var(--accent); }
.nav-item[aria-current="page"]::before{ content: ''; position: absolute; left: -12px; top: 10px; bottom: 10px; width: 3px; border-radius: 0 3px 3px 0; background: var(--accent); box-shadow: 0 0 12px var(--glow); }
.rail-foot{ margin-top: auto; display: grid; gap: var(--s3); }
.rail-ai{ display: flex; align-items: center; gap: var(--s3); padding: var(--s3); border: 0; border-radius: var(--r); cursor: pointer; text-align: left;
  background: var(--surface-1); box-shadow: var(--shadow-1), var(--ring); transition: transform var(--dur-instant) var(--ease-out), box-shadow var(--dur-base) var(--ease-out); }
.rail-ai-text{ display: grid; line-height: 1.25; min-width: 0; }
.rail-ai-text b{ font-size: var(--fs-sm); }
.rail-ai-text small{ font-size: var(--fs-micro); color: var(--ink-dim); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.rail-by{ font-size: var(--fs-micro); color: var(--ink-faint); padding: 0 var(--s2); }
.rail-by b{ color: var(--ink-dim); font-weight: 600; }

/* --- TOP BAR ------------------------------------------------------------- */
.topbar{
  position: sticky; top: 0; z-index: 15; display: flex; align-items: center; gap: var(--s4); padding: 0 var(--s5);
  background: var(--mat-chrome); -webkit-backdrop-filter: var(--mat-blur); backdrop-filter: var(--mat-blur);
  box-shadow: inset 0 -1px 0 var(--line);
}
/* a long screen title or subtitle ends in an ellipsis instead of running under the ask bar */
.tb-title{ min-width: 0; flex: 0 0 auto; overflow: hidden; max-width: 36vw; }
.tb-crumb{ display: block; font: 700 var(--fs-lg)/1.2 var(--font-display); letter-spacing: -.015em; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.tb-crumb small{ font: 400 var(--fs-sm)/1 var(--font-body); color: var(--ink-dim); margin-left: var(--s2); letter-spacing: 0; }
.tb-ask{
  flex: 1 1 380px; min-width: 0; max-width: 520px; margin: 0 auto; display: flex; align-items: center; gap: var(--s3); min-height: 40px; padding: 0 var(--s2) 0 var(--s2);
  border: 0; border-radius: var(--r-pill); cursor: text; color: var(--ink-dim); text-align: left;
  background: var(--surface-1); box-shadow: var(--shadow-1), var(--ring);
  transition: box-shadow var(--dur-base) var(--ease-out), transform var(--dur-instant) var(--ease-out);
}
.tb-ask-text{ flex: 1; min-width: 0; font-size: var(--fs-sm); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.tb-right{ display: flex; align-items: center; gap: var(--s2); flex: none; }
.tb-live{ display: inline-flex; align-items: center; gap: var(--s2); font-size: var(--fs-micro); color: var(--ink-dim); padding: 0 var(--s2); white-space: nowrap; }
.tb-bell{ position: relative; }
.tb-bell .badge{ position: absolute; top: -3px; right: -5px; min-width: 18px; height: 18px; padding: 0 5px; border-radius: var(--r-pill);
  display: grid; place-items: center; font-size: 11px; background: var(--bad); color: var(--on-accent); box-shadow: 0 0 0 2px var(--surface-1); }
.tb-role{ border: 0; background: none; padding: 2px; border-radius: 50%; cursor: pointer; transition: transform var(--dur-instant) var(--ease-out); }
.tb-role .avatar{ width: 34px; height: 34px; }

/* the Day / Night switch: a visible feature, not a menu item */
.daynight{ position: relative; display: inline-flex; padding: 3px; border-radius: var(--r-pill); background: var(--surface-3); box-shadow: inset 0 0 0 1px var(--line); }
.daynight button{
  position: relative; z-index: 1; display: inline-flex; align-items: center; gap: 6px; min-height: 30px; padding: 0 var(--s3); border: 0; border-radius: var(--r-pill);
  background: transparent; cursor: pointer; font: 600 var(--fs-sm)/1 var(--font-body); color: var(--ink-dim);
  transition: color var(--dur-base) var(--ease-out), transform var(--dur-instant) var(--ease-out);
}
.daynight .dn-ic .ic{ width: 16px; height: 16px; transition: transform var(--dur-slow) var(--ease-out); }
.dn-thumb{ position: absolute; top: 3px; bottom: 3px; left: 3px; width: calc(50% - 3px); border-radius: var(--r-pill);
  background: var(--surface-1); box-shadow: var(--shadow-1), var(--ring); transition: transform var(--dur-drawer) var(--ease-drawer); }
:root[data-theme="night"] .dn-thumb{ transform: translateX(100%); background: var(--surface-3); box-shadow: 0 0 0 1px var(--line-2), 0 0 18px var(--glow); }
:root:not([data-theme="night"]) .daynight [data-t="day"],
:root[data-theme="night"] .daynight [data-t="night"]{ color: var(--ink); }
:root:not([data-theme="night"]) .daynight [data-t="day"] .ic{ color: var(--warn); transform: rotate(45deg); }
:root[data-theme="night"] .daynight [data-t="night"] .ic{ color: var(--accent); transform: rotate(-12deg); }

/* --- VIEW ---------------------------------------------------------------- */
.view{ padding: var(--s5) var(--s6) var(--s8); }
.view.full{ padding: 0; }
.page-head{ display: flex; align-items: flex-end; justify-content: space-between; gap: var(--s4); margin-bottom: var(--s5); flex-wrap: wrap; }
.page-head h1{ font-size: var(--fs-2xl); }
.page-head .lede{ font-size: var(--fs-lg); color: var(--ink-dim); margin: var(--s2) 0 0; max-width: 62ch; line-height: 1.4; }
.page-head .lede b{ color: var(--ink); font-weight: 600; }

/* --- MINI ORB: the AI presence everywhere the 3D world is not ----------- */
.mini-orb{ --o: 34px; position: relative; width: var(--o); height: var(--o); flex: none; display: inline-block; border-radius: 50%;
  background: radial-gradient(circle at 34% 30%, var(--hot), color-mix(in oklab, var(--accent) 22%, var(--surface-1)) 46%, color-mix(in oklab, var(--accent) 55%, var(--surface-3)) 100%);
  box-shadow: inset 0 -3px 6px color-mix(in oklab, var(--accent) 30%, transparent), 0 2px 10px var(--glow); }
.mini-orb.sm{ --o: 26px; } .mini-orb.lg{ --o: 72px; }
.mini-orb i{ position: absolute; pointer-events: none; border-radius: 50%; }
.mini-orb i:nth-child(1){ inset: -40%; background: radial-gradient(circle, var(--glow), transparent 62%); opacity: .7; }
.mini-orb i:nth-child(2){ inset: -18%; border: 1.5px solid color-mix(in oklab, var(--accent) 60%, transparent); border-left-color: transparent; border-right-color: transparent; transform: rotateX(68deg) rotateZ(0deg); }
.mini-orb i:nth-child(3){ width: 34%; height: 34%; left: 33%; top: 36%; background: radial-gradient(circle at 40% 40%, var(--hot), var(--accent) 60%); box-shadow: 0 0 8px var(--accent); }
@media (prefers-reduced-motion: no-preference){
  .mini-orb[data-state="idle"] i:nth-child(1){ animation: orb-breathe var(--loop-breathe) var(--ease-in-out) infinite; }
  .mini-orb[data-state="idle"] i:nth-child(2){ animation: orb-spin calc(var(--ambient-c) / 2) linear infinite; }
  .mini-orb[data-state="listening"] i:nth-child(3){ transform: scale(1.3); transition: transform var(--dur-base) var(--ease-out); }
  .mini-orb[data-state="thinking"] i:nth-child(1){ animation: orb-breathe calc(var(--loop-breathe) / 5) var(--ease-in-out) infinite; opacity: 1; }
  .mini-orb[data-state="thinking"] i:nth-child(2){ animation: orb-spin calc(var(--loop-load) / 1.4) linear infinite; }
  .mini-orb[data-state="acting"] i:nth-child(2){ animation: orb-spin calc(var(--loop-load) / 2) linear infinite; border-color: var(--accent); }
  .mini-orb[data-state="acting"] i:nth-child(3){ animation: orb-look var(--loop-load) var(--ease-in-out) infinite; }
  .mini-orb[data-state="answering"] i:nth-child(1){ animation: orb-breathe calc(var(--loop-breathe) / 3) var(--ease-in-out) infinite; opacity: 1; }
  .mini-orb[data-state="answering"] i:nth-child(2){ animation: orb-spin calc(var(--ambient-c) / 5) linear infinite; }
  @keyframes orb-breathe{ 50%{ transform: scale(1.12); opacity: 1; } }
  @keyframes orb-spin{ to{ transform: rotateX(68deg) rotateZ(360deg); } }
  @keyframes orb-look{ 25%{ transform: translate(-30%, 5%); } 75%{ transform: translate(30%, -5%); } }
}
.motion-paused .mini-orb i{ animation-play-state: paused; }

/* --- AI EDGE: the viewport itself lights while the assistant works -------- */
.ai-edge{ position: fixed; inset: 0; z-index: 90; pointer-events: none; opacity: 0; border-radius: 0;
  box-shadow: inset 0 0 0 2px color-mix(in oklab, var(--accent) 70%, transparent), inset 0 0 60px var(--glow);
  transition: opacity var(--dur-drawer) var(--ease-out); }
html.ai-working .ai-edge{ opacity: 1; }
@media (prefers-reduced-motion: no-preference){
  html.ai-working .ai-edge{ animation: edge-breathe calc(var(--loop-breathe) / 3) var(--ease-in-out) infinite; }
  @keyframes edge-breathe{ 50%{ opacity: .55; } }
}

/* --- TAB BAR (phones) ---------------------------------------------------- */
.tabbar{ display: none; }

/* --- LAYER: drawer, sheet, palette, tray --------------------------------- */
.layer{ position: fixed; inset: 0; z-index: 100; pointer-events: none; }
.scrim{ position: absolute; inset: 0; background: var(--scrim); opacity: 0; pointer-events: auto;
  -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px); transition: opacity var(--dur-slow) var(--ease-out); }
.scrim.in{ opacity: 1; }
.drawer{
  position: absolute; top: var(--s3); right: var(--s3); bottom: var(--s3); width: min(520px, calc(100vw - 24px));
  display: flex; flex-direction: column; pointer-events: auto; overflow: hidden;
  background: var(--surface-1); border-radius: var(--r-lg); box-shadow: var(--shadow-3), var(--ring);
  transform: translateX(104%); transition: transform var(--dur-drawer) var(--ease-drawer);
}
.drawer.in{ transform: none; }
.drawer-head{ display: flex; align-items: flex-start; gap: var(--s3); padding: var(--s5) var(--s5) var(--s4); border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, var(--tint), transparent); }
.drawer-head h2{ font-size: var(--fs-xl); flex: 1; }
.drawer-head .eyebrow{ margin-bottom: var(--s2); }
.drawer-body{ flex: 1; overflow: auto; padding: var(--s5); overscroll-behavior: contain; }
.drawer-body > *{ opacity: 0; transform: translateY(8px); transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out); }
.drawer.in .drawer-body > *{ opacity: 1; transform: none; }
.drawer.in .drawer-body > *:nth-child(2){ transition-delay: 60ms; } .drawer.in .drawer-body > *:nth-child(3){ transition-delay: 110ms; }
.drawer.in .drawer-body > *:nth-child(4){ transition-delay: 160ms; } .drawer.in .drawer-body > *:nth-child(n+5){ transition-delay: 210ms; }

.palette{
  position: absolute; left: 50%; top: 12vh; width: min(680px, calc(100vw - 24px)); pointer-events: auto;
  background: var(--surface-1); border-radius: var(--r-lg); box-shadow: var(--shadow-3), var(--ring); overflow: hidden;
  transform: translateX(-50%) translateY(-8px) scale(.98); opacity: 0; transform-origin: top center;
  transition: transform var(--dur-base) var(--ease-out), opacity var(--dur-base) var(--ease-out);
}
.palette.in{ transform: translateX(-50%); opacity: 1; }
.palette-in{ display: flex; align-items: center; gap: var(--s3); padding: var(--s4) var(--s5); border-bottom: 1px solid var(--line); }
.palette-in input{ flex: 1; border: 0; background: none; font: 400 var(--fs-lg)/1.3 var(--font-body); color: var(--ink); outline: none; }
.palette-list{ max-height: 52vh; overflow: auto; padding: var(--s2); }
.palette-group{ padding: var(--s3) var(--s3) var(--s1); font-size: var(--fs-micro); color: var(--ink-faint); font-weight: 600; }
.palette-list .row[aria-selected="true"]{ background: var(--tint); }

.tray{
  position: absolute; top: calc(var(--topbar-h) - 4px); right: var(--s5); width: min(420px, calc(100vw - 24px)); max-height: 72vh;
  display: flex; flex-direction: column; pointer-events: auto; overflow: hidden;
  background: var(--surface-1); border-radius: var(--r-lg); box-shadow: var(--shadow-3), var(--ring);
  transform-origin: top right; transform: scale(.96) translateY(-6px); opacity: 0;
  transition: transform var(--dur-base) var(--ease-out), opacity var(--dur-base) var(--ease-out);
}
.tray.in{ transform: none; opacity: 1; }
.tray-head{ display: flex; align-items: center; justify-content: space-between; padding: var(--s4) var(--s4) var(--s3); border-bottom: 1px solid var(--line); }
.tray-list{ overflow: auto; padding: var(--s2); }
.note{ border: 0; width: 100%; text-align: left; cursor: pointer; color: inherit; background: transparent; font: inherit; display: grid; grid-template-columns: auto 1fr; gap: var(--s1) var(--s3); padding: var(--s3); border-radius: var(--r-sm); position: relative;
  transition: background var(--dur-fast) var(--ease-out); }
.note .sev{ width: 8px; height: 8px; border-radius: 50%; margin-top: 7px; background: var(--ink-faint); }
.note .sev.critical, .note .sev.high{ background: var(--bad); } .note .sev.medium{ background: var(--warn); } .note .sev.good{ background: var(--ok); } .note .sev.low, .note .sev.info{ background: var(--accent); }
.note .n-t{ font-weight: 600; font-size: var(--fs-sm); line-height: 1.35; }
.note .n-m{ grid-column: 2; font-size: var(--fs-micro); color: var(--ink-dim); display: flex; gap: var(--s2); align-items: center; flex-wrap: wrap; }
.note.unread{ background: var(--tint); }

/* --- TOASTS: a capsule HUD that drops in from the top ------------------- */
.toasts{ position: fixed; top: var(--s3); left: var(--s3); right: var(--s3); z-index: 120; display: grid; justify-items: center; gap: var(--s2); pointer-events: none; }
.toast{ display: flex; align-items: center; gap: var(--s3); padding: var(--s2) var(--s4) var(--s2) var(--s2); border-radius: var(--r-pill); pointer-events: auto;
  background: var(--mat-chrome); -webkit-backdrop-filter: var(--mat-blur); backdrop-filter: var(--mat-blur); box-shadow: var(--shadow-2), var(--ring);
  font-size: var(--fs-sm); font-weight: 600; max-width: min(560px, 92vw);
  transform: translateY(-20px) scale(.96); opacity: 0; transition: transform var(--dur-slow) var(--ease-drawer), opacity var(--dur-base) var(--ease-out); }
.toast.in{ transform: none; opacity: 1; }
.toast .t-ic{ width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center; background: var(--tint); color: var(--accent); flex: none; }
.toast .t-ic.ok{ background: var(--ok-tint); color: var(--ok); }
.toast .t-ic.bad{ background: var(--bad-tint); color: var(--bad); }
.toast .t-ic.warn{ background: var(--warn-tint); color: var(--warn); }
.toast>span:last-child{ min-width: 0; }
.toast .t-ic .ic{ width: 16px; height: 16px; }
.toast .t-ic.ok path{ stroke-dasharray: 24; stroke-dashoffset: 24; }
.toast.in .t-ic.ok path{ stroke-dashoffset: 0; transition: stroke-dashoffset var(--dur-drawer) var(--ease-out) var(--dur-fast); }
.toast small{ display: block; font-weight: 400; color: var(--ink-dim); font-size: var(--fs-micro); }

/* --- BOOT ---------------------------------------------------------------- */
.boot{ position: fixed; inset: 0; z-index: 200; display: grid; place-items: center; align-content: center; gap: var(--s5);
  background: var(--bg); transition: opacity var(--dur-drawer) var(--ease-out); }
.boot.out{ opacity: 0; pointer-events: none; }
.boot-line{ font-size: var(--fs-sm); color: var(--ink-dim); min-height: 1.6em; }
.boot.failed .boot-line{ display: grid; justify-items: center; gap: var(--s2); text-align: center; max-width: 34ch; padding: 0 var(--s4); font-family: var(--font-body); }
.boot.failed .boot-line b{ font: 600 var(--fs-lg)/1.3 var(--font-body); color: var(--ink); }
.boot.failed .boot-line .btn{ margin-top: var(--s3); min-height: var(--h-touch); }

/* --- TOUR ---------------------------------------------------------------- */
.tour-card{
  position: fixed; left: 50%; bottom: var(--s6); z-index: 110; width: min(560px, calc(100vw - 24px)); pointer-events: auto;
  transform: translateX(-50%); padding: var(--s5); border-radius: var(--r-lg);
  background: var(--mat-chrome); -webkit-backdrop-filter: var(--mat-blur); backdrop-filter: var(--mat-blur); box-shadow: var(--shadow-3), var(--ring);
  transition: transform var(--dur-slow) var(--ease-drawer), opacity var(--dur-base) var(--ease-out);
}
.tour-card{ animation: tour-in var(--dur-slow) var(--ease-drawer) both; }
@keyframes tour-in{ from{ opacity: 0; transform: translateX(-50%) translateY(16px); } }
@media (min-width: 1101px){
  .tour-card{ left: auto; right: var(--s5); transform: none; width: 380px; bottom: var(--s5); }
  @keyframes tour-in{ from{ opacity: 0; transform: translateY(16px); } }
}
.tour-card h3{ font-size: var(--fs-xl); margin: var(--s2) 0 var(--s2); }
.tour-card p{ color: var(--ink-dim); margin: 0 0 var(--s4); font-size: var(--fs-base); }
.tour-foot{ display: flex; align-items: center; gap: var(--s2); }
.tour-dots{ display: flex; gap: 6px; margin-right: auto; }
.tour-dots i{ width: 6px; height: 6px; border-radius: 50%; background: var(--line-2); transition: transform var(--dur-base) var(--ease-out), background var(--dur-base) var(--ease-out); }
.tour-dots i.on{ background: var(--accent); transform: scale(1.4); }
html.presenting .topbar .tb-present{ --btn-bg: var(--accent); --btn-ink: var(--on-accent); }

/* --- THE THEME TRANSITION ------------------------------------------------ */
@property --vt-r{ syntax: '<length>'; inherits: false; initial-value: 0px; }
html.theme-shift *, html.theme-shift *::before, html.theme-shift *::after{ transition: none !important; }
::view-transition-old(root), ::view-transition-new(root){ animation: none; mix-blend-mode: normal; }
html.theme-up::view-transition-new(root){
  -webkit-mask-image: radial-gradient(circle at var(--tv-x) var(--tv-y), var(--mask) calc(var(--vt-r) - 90px), transparent var(--vt-r));
          mask-image: radial-gradient(circle at var(--tv-x) var(--tv-y), var(--mask) calc(var(--vt-r) - 90px), transparent var(--vt-r));
  animation: vt-open var(--dur-theme) var(--ease-in-out) both;
}
html.theme-down::view-transition-old(root){
  z-index: 2;
  -webkit-mask-image: radial-gradient(circle at var(--tv-x) var(--tv-y), var(--mask) calc(var(--vt-r) - 90px), transparent var(--vt-r));
          mask-image: radial-gradient(circle at var(--tv-x) var(--tv-y), var(--mask) calc(var(--vt-r) - 90px), transparent var(--vt-r));
  animation: vt-close var(--dur-theme) var(--ease-in-out) both;
}
html.theme-down::view-transition-new(root){ z-index: 1; }
@keyframes vt-open{ from{ --vt-r: 0px; } to{ --vt-r: calc(var(--tv-r) + 120px); } }
@keyframes vt-close{ from{ --vt-r: calc(var(--tv-r) + 120px); } to{ --vt-r: 0px; } }

/* page swaps crossfade under a still rail */
::view-transition-old(view), ::view-transition-new(view){ animation-duration: var(--dur-base); animation-timing-function: var(--ease-out); }
html.route-shift .view{ view-transition-name: view; }

/* --- HOVER + PRESS ------------------------------------------------------- */
@media (hover: hover) and (pointer: fine){
  .nav-item:hover{ color: var(--ink); background: var(--surface-2); }
  .nav-item:hover .ic{ transform: scale(1.12); }
  .rail-ai:hover{ transform: translateY(-2px); box-shadow: var(--shadow-2), var(--ring); }
  .tb-ask:hover{ box-shadow: var(--shadow-2), 0 0 0 1px var(--accent); }
  .daynight button:hover{ color: var(--ink); }
  .daynight button:hover .ic{ transform: rotate(-18deg) scale(1.1); }
  .tb-role:hover{ transform: scale(1.06); }
  .note:hover{ background: var(--surface-2); }
  .rail-brand:hover .rail-logo{ box-shadow: var(--shadow-2), 0 0 0 1px var(--accent); }
}
.nav-item:active, .rail-ai:active, .tb-ask:active, .daynight button:active, .tb-role:active{ transform: scale(.97); }

/* --- RESPONSIVE ---------------------------------------------------------- */
/* demonstration marker, shown whenever the client file is a demo */
.tb-demo{ display: inline-flex; align-items: center; gap: var(--s2); height: 28px; padding: 0 var(--s3); border-radius: var(--r-pill); background: var(--warn-tint); color: var(--warn); font-size: var(--fs-micro); font-weight: 600; white-space: nowrap; cursor: help; }
.tb-demo[hidden], .rail-demo[hidden]{ display: none; }
.tb-demo-dot{ width: 6px; height: 6px; border-radius: 50%; background: var(--warn); }
.rail-demo{ font-size: var(--fs-micro); color: var(--warn); font-weight: 600; padding: 0 var(--s3) var(--s1); }

@media (max-width: 1280px){
  .tb-live{ display: none; }
}
@media (max-width: 1600px){ .tb-crumb small{ display: none; } }
@media (max-width: 1100px){
  .shell{ grid-template-columns: var(--rail-w-collapsed) minmax(0, 1fr); }
  .rail{ padding: var(--s4) var(--s2); align-items: center; }
  .rail-name, .rail-ai-text, .rail-by, .rail-demo, .nav-item .nl, .nav-item .nav-badge, .nav-group{ display: none; }
  .nav-item{ width: 48px; justify-content: center; padding: 0; }
  .nav-item[aria-current="page"]::before{ left: -8px; }
  .rail-ai{ padding: var(--s2); }
  .tb-present span:last-child, .daynight .dn-l{ display: none; }
}
@media (max-width: 760px){
  .shell{ grid-template-columns: minmax(0, 1fr); grid-template-rows: 56px minmax(0, 1fr); grid-template-areas: "top" "view"; }
  .rail{ display: none; }
  .topbar{ padding: 0 var(--s4); gap: var(--s2); }
  .tb-ask{ display: none; }
  .tb-present, .tb-role{ display: none; }
  .tb-demo-more{ display: none; }
  .tb-crumb{ font-size: var(--fs-lg); }
  .view{ padding: var(--s4) var(--s4) calc(96px + env(safe-area-inset-bottom)); }
  .tabbar{
    display: grid; grid-template-columns: repeat(5, 1fr); position: fixed; left: 0; right: 0; bottom: 0; z-index: 30;
    padding: var(--s1) var(--s2) calc(var(--s1) + env(safe-area-inset-bottom));
    background: var(--mat-chrome); -webkit-backdrop-filter: var(--mat-blur); backdrop-filter: var(--mat-blur); box-shadow: inset 0 1px 0 var(--line);
  }
  .tab{ display: grid; justify-items: center; gap: 2px; padding: 6px 0; min-height: var(--h-touch); border: 0; background: none; color: var(--ink-dim);
    font: 600 11px/1.2 var(--font-body); text-decoration: none; cursor: pointer; transition: transform var(--dur-instant) var(--ease-out); }
  .tab .ic{ width: 22px; height: 22px; }
  .tab[aria-current="page"]{ color: var(--accent); }
  .tab:active{ transform: scale(.94); }
  .tray{ right: var(--s3); left: var(--s3); width: auto; }
  .drawer{ top: auto; left: 0; right: 0; bottom: 0; width: 100%; max-height: 92dvh; border-radius: var(--r-lg) var(--r-lg) 0 0; transform: translateY(104%); }
  .drawer::before{ content: ''; position: absolute; top: 6px; left: 50%; width: 40px; height: 5px; margin-left: -20px; border-radius: 3px; background: var(--line-2); }
  .tour-card{ bottom: calc(80px + env(safe-area-inset-bottom)); }
  .toasts{ top: calc(56px + var(--s2)); }
  .toast{ border-radius: var(--r); width: 100%; }
  .tb-bell, .daynight button{ min-width: var(--h-touch); min-height: var(--h-touch); }
  .tab{ min-height: 52px; }
}

/* --- DAY / NIGHT INVITATION (js/ui/nudge.js): once per visitor ----------- */
.daynight::after{ content: ''; position: absolute; inset: -5px; border-radius: var(--r-pill); pointer-events: none; opacity: 0;
  box-shadow: 0 0 0 2px var(--accent), 0 0 22px var(--glow); }
.daynight.dn-nudge::after{ opacity: 1; }
.dn-tip{ position: fixed; left: 0; top: 0; z-index: 95; display: flex; align-items: stretch; gap: 2px; max-width: 280px; padding: 4px; border-radius: var(--r);
  background: var(--surface-1); box-shadow: var(--shadow-3), 0 0 0 1px var(--accent); opacity: 0; pointer-events: none; }
.dn-tip--sheet{ top: auto; left: var(--s3); right: var(--s3); bottom: calc(76px + env(safe-area-inset-bottom)); max-width: none; }
.dn-tip--sheet::before{ display: none; }
.dn-tip--sheet .dn-tip-go{ flex: 1; min-height: var(--h-touch); }
.dn-tip--sheet .dn-tip-x{ width: var(--h-touch); }
.dn-tip.on{ opacity: 1; pointer-events: auto; }
.dn-tip::before{ content: ''; position: absolute; top: -6px; left: calc(var(--arrow-x, 50%) - 6px); width: 12px; height: 12px; transform: rotate(45deg);
  background: var(--surface-1); box-shadow: -1px -1px 0 0 var(--accent); }
.dn-tip-go{ display: grid; gap: 2px; padding: var(--s2) var(--s3); border: 0; border-radius: var(--r-sm); background: transparent; color: var(--ink); text-align: left; font: inherit; cursor: pointer; }
.dn-tip-go b{ font: 600 var(--fs-base)/1.2 var(--font-body); color: var(--accent); }
.dn-tip-go span{ font-size: var(--fs-sm); color: var(--ink-dim); line-height: 1.35; }
.dn-tip-x{ display: grid; place-items: center; width: 32px; border: 0; border-radius: var(--r-sm); background: transparent; color: var(--ink-dim); cursor: pointer; }
.dn-tip-x .ic{ width: 16px; height: 16px; }
@media (hover: hover) and (pointer: fine){ .dn-tip-go:hover, .dn-tip-x:hover{ background: var(--tint); } .dn-tip-x:hover{ color: var(--ink); } }
.dn-tip-go:active, .dn-tip-x:active{ transform: scale(.97); }
.dn-tip-go:focus-visible, .dn-tip-x:focus-visible{ outline: 2px solid var(--accent); outline-offset: 1px; }
@media (prefers-reduced-motion: no-preference){
  .dn-tip{ transition: opacity var(--dur-slow) var(--ease-out); }
  .dn-tip.on{ animation: dn-tip-in var(--dur-drawer) var(--ease-drawer); }
  @keyframes dn-tip-in{ from{ opacity: 0; translate: 0 -8px; } }
  .daynight::after{ transition: opacity var(--dur-slow) ease; }
  .daynight.dn-nudge::after{ animation: dn-halo 1.8s var(--ease-out) infinite; }
  @keyframes dn-halo{ 0%{ transform: scale(1); opacity: 1; } 70%{ transform: scale(1.18); opacity: 0; } 100%{ transform: scale(1.18); opacity: 0; } }
  .daynight.dn-nudge .dn-ic .ic{ animation: dn-wiggle 1.8s var(--ease-in-out) infinite; }
  @keyframes dn-wiggle{ 0%, 60%, 100%{ rotate: 0deg; } 70%{ rotate: -16deg; } 80%{ rotate: 12deg; } }
  .daynight.dn-pop{ animation: dn-pop var(--dur-drawer) var(--spring); }
  .daynight.dn-pop::after{ animation: dn-ring var(--dur-drawer) var(--ease-out); }
  @keyframes dn-pop{ 0%{ transform: scale(.94); } 55%{ transform: scale(1.05); } 100%{ transform: scale(1); } }
  @keyframes dn-ring{ from{ opacity: 1; transform: scale(1); } to{ opacity: 0; transform: scale(1.35); } }
}
.motion-paused .daynight::after, .motion-paused .daynight .ic{ animation-play-state: paused; }