/* app.css source lines: 21-32, 1293-1358 — app-shell glass topbar, splash */
/* ── APP SHELL ──────────────────────────────────────────────────────── */
/* Glass top bar (DS Topbar specimen): horizontal sticky row, tokens-only.
   No float → #app flows normally (Slice-1's flow-root BFC hack removed).
   login/reset still hide .hdr via inline style — zero JS needed. */
.hdr{
  display:flex;flex-direction:row;align-items:center;gap:14px;
  position:sticky;top:0;width:100%;height:56px;
  padding:0 24px;
  background:var(--glass-bg);
  backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);
  border-bottom:var(--glass-border);
  transition:background-color var(--dur-2) ease,border-color var(--dur-2) ease;
  z-index:var(--z-sticky);
}
.hdr-logo{display:flex;align-items:center;flex-shrink:0;text-decoration:none}
.hdr-brand{display:flex;align-items:center;gap:8px;flex-shrink:0}
.hdr-spacer{flex:1 1 auto}
.ms-logo{display:inline-flex;align-items:baseline;gap:0;line-height:1;font-family:var(--font);letter-spacing:-.02em}
.ms-logo-meta{font-weight:800;color:var(--tx);font-size:1em}
.ms-logo-scope{font-weight:700;color:#fff;background:#6F8F9D;padding:.12em .35em .14em;border-radius:.28em;font-size:1em;margin-left:.04em}
.hdr-title{font-size:14px;font-weight:700;color:var(--tx);letter-spacing:-.01em}
.hdr-sub{font-size:var(--fs-13);color:var(--mt);margin-top:1px;font-weight:400;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.hdr-divider{width:1px;height:22px;background:var(--bord);margin:0 4px}
.hdr-badge{display:flex;align-items:center;gap:6px;font-size:var(--fs-12);color:var(--mt)}
.hdr-dot{width:6px;height:6px;border-radius:50%;background:var(--vd);box-shadow:0 0 6px var(--vd);flex-shrink:0}

/* Theme toggle (sanctioned additive UI — plan D2/D4) */
.hdr-theme{
  display:flex;align-items:center;gap:8px;flex-shrink:0;height:30px;padding:0 12px;
  border-radius:var(--r-ctl);font-family:var(--font);font-size:var(--fs-12);font-weight:600;
  cursor:pointer;border:1px solid var(--bord2);background:var(--surf);color:var(--tx);
  transition:background var(--dur-2),border-color var(--dur-2),color var(--dur-2);
}
.hdr-theme:hover{background:var(--surf-hover);border-color:var(--bord)}
.hdr-theme svg{width:14px;height:14px;flex-shrink:0;opacity:.8}
/* Rail breakpoints (≤1024 width, ≤768 collapse) removed with the rail —
   responsive.css owns ≤768 header compaction for the topbar. */

/* ══ SPLASH SCREEN ════════════════════════════════════════════════════════ */
#splash {
  position: fixed;
  inset: 0;
  z-index: 99999;
  background: var(--bg-solid);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
  transition: opacity .75s var(--ease-standard);
}
.splash-glow {
  position: absolute; inset: 0; overflow: hidden; pointer-events: none;
}
.splash-glow::before {
  content: '';
  position: absolute;
  top: -15%; left: 50%; transform: translateX(-50%);
  width: 700px; height: 700px; border-radius: 50%;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 65%);
  /* ponytail: old second green glow (::after) dropped — copper carries the identity */
}
.splash-brand {
  position: relative;
  font-family: var(--font);
  font-size: 52px; line-height: 1; letter-spacing: -.02em;
  animation: splashIn .85s var(--ease-out) both;
  text-align: center;
}
.splash-meta { font-weight: 800; color: var(--tx); }
.splash-scope {
  font-weight: 700; color: #fff; background: #6F8F9D;
  padding: .1em .3em .13em; border-radius: .25em; margin-left: .04em;
}
.splash-sub {
  position: relative;
  font-family: var(--font);
  font-size: 13px; color: var(--mt);
  letter-spacing: .12em; text-transform: uppercase;
  animation: splashIn .85s .18s var(--ease-out) both;
}
.splash-bar {
  position: relative;
  width: 200px; height: 2px;
  background: var(--bord); border-radius: 1px;
  overflow: hidden;
  animation: splashIn .5s .35s var(--ease-out) both;
}
.splash-bar-fill {
  position: absolute; inset: 0;
  background: linear-gradient(90deg, var(--copper), var(--az), var(--vd));
  border-radius: 1px;
  transform: scaleX(0); transform-origin: left;
  animation: loadBar 2.6s .4s var(--ease-standard) forwards;
}
@keyframes splashIn { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: translateY(0); } }
@keyframes loadBar { from { transform: scaleX(0); } to { transform: scaleX(1); } }