/* ============================================================
   PAGE · APP SHELL
   Reusable chrome for every non-marketing page (signup, sign-in,
   phone linking, dashboard, account, billing, GTD read views).
   Provides: a sticky topbar, a flex-grown main, and a footer
   pinned to the bottom — plus two content compositions:
     · .app-auth  — a centred, constrained card for forms
     · .app-page  — a top-aligned reading column for content
   Composes the system's objects/components; adds no new colours.

   The topbar/footer recipe deliberately mirrors the landing
   (08-pages/_landing.css) so signed-in pages feel like the same
   machine, but is kept separate so app chrome can diverge from
   marketing chrome without disturbing the landing.
   ============================================================ */

/* ---- Shell skeleton -------------------------------------------------- */
.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
.app-main {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
}

/* CTAs rendered as <a class="c-button"> shouldn't pick up the bare-link
   underline + glow (same fix the landing applies). */
.app a.c-button { text-decoration: none; }
.app a.c-button:hover { text-shadow: none; }

/* ---- Skip link ------------------------------------------------------- */
.app-skip {
  position: absolute;
  left: var(--space-3);
  top: var(--space-3);
  z-index: var(--z-toast);
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface-raised);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-xs);
  color: var(--color-accent);
  font-family: var(--font-plaque);
  font-size: var(--fs-3xs);
  letter-spacing: var(--ls-widest);
  text-transform: uppercase;
  text-decoration: none;
  transform: translateY(-150%);
  transition: transform var(--dur-fast) var(--ease-snap);
}
.app-skip:focus-visible { transform: translateY(0); }

/* ---- Background grid (faint telemetry field) ------------------------ */
.app-grid-bg {
  position: fixed;
  inset: 0;
  z-index: var(--z-below);
  pointer-events: none;
  background-image: var(--pattern-grid);
  background-size: var(--grid-cell) var(--grid-cell);
  opacity: 0.25;
  mask-image: radial-gradient(ellipse at top, black 0%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at top, black 0%, transparent 75%);
}

/* ---- Topbar ---------------------------------------------------------- */
.app-topbar {
  position: sticky;
  top: 0;
  z-index: var(--z-overlay);
  background: color-mix(in srgb, var(--color-surface) 88%, transparent);
  border-bottom: var(--border-thick) solid var(--color-bezel-dark);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(8px);
}
.app-topbar__inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding-block: var(--space-3);
}
.app-topbar__spacer { flex: 1; }
.app-topbar__status { flex-shrink: 0; }

.app-brand {
  font-family: var(--font-plaque);
  font-size: var(--fs-lg);
  font-weight: var(--fw-black);
  letter-spacing: var(--ls-wider);
  text-transform: uppercase;
  text-decoration: none;
  white-space: nowrap;
}
.app-brand__name {
  background: var(--gradient-vapor);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 6px color-mix(in srgb, var(--c-brand-hi) 40%, transparent));
}
.app-brand:hover { text-shadow: none; }
.app-brand__sub {
  font-family: var(--font-data);
  font-size: var(--fs-3xs);
  letter-spacing: var(--ls-widest);
  color: var(--color-text-muted);
  -webkit-text-fill-color: var(--color-text-muted);
  background: none;
  filter: none;
  margin-left: var(--space-2);
  vertical-align: middle;
}

/* button_to (sign out) renders a wrapping <form>; keep it inline in the
   nav cluster with no stray margin. */
.app-topbar nav form,
.app-footer nav form { margin: 0; }

/* ---- Footer ---------------------------------------------------------- */
.app-footer {
  margin-top: var(--space-8);
  padding-block: var(--space-6);
  border-top: var(--border-thick) solid var(--color-bezel-dark);
  background: color-mix(in srgb, var(--color-surface) 70%, transparent);
}
.app-footer__fine { font-size: var(--fs-xs); margin-top: var(--space-2); }

/* ---- Auth / form composition (centred constrained card) ------------- */
.app-auth {
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-block: var(--space-7);
}
.app-auth__card {
  width: 100%;
  max-width: 26rem;
}
.app-auth__head { text-align: center; }
.app-auth__head h1 {
  font-size: var(--fs-xl);
  margin-top: var(--space-2);
}
.app-auth__errors {
  margin: 0;
  padding-left: var(--space-4);
}
.app-auth__foot {
  text-align: center;
  font-size: var(--fs-sm);
}
/* A full-width submit reads better centred. */
.app-auth .c-button.u-fill { justify-content: center; }

/* ---- Page composition (top-aligned reading column) ------------------ */
.app-page { padding-block: var(--space-7); }
.app-page__head {
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}
.app-page__head h1 { font-size: var(--fs-2xl); }
.app-page__head p { color: var(--color-text-muted); margin-top: var(--space-1); }

/* The trailing action row on content pages (Manage billing / Sign out). */
.app-page nav { display: flex; flex-wrap: wrap; gap: var(--space-3); }

/* ---- GTD read views -------------------------------------------------- */
/* Every GTD action renders <article class="gtd-content">; give it the same
   reading column the .app-page wrapper provides, without touching each view. */
.gtd-content {
  width: 100%;
  max-width: var(--container-narrow);
  margin-inline: auto;
  padding-inline: var(--space-5);
  padding-block: var(--space-7);
}
.gtd-content > * + * { margin-top: var(--space-4); }
.gtd-markdown > * + * { margin-top: var(--space-3); }
.gtd-markdown ul,
.gtd-markdown ol { padding-left: var(--space-5); }
.gtd-markdown li + li { margin-top: var(--space-1); }
.gtd-empty {
  color: var(--color-text-muted);
  font-style: italic;
}
.gtd-horizon-section + .gtd-horizon-section { margin-top: var(--space-6); }
.gtd-horizon-section h2 { margin-bottom: var(--space-3); }

.gtd-schedules,
.gtd-review-list { width: 100%; }
.gtd-schedules { border-collapse: collapse; }
.gtd-schedules th,
.gtd-schedules td {
  text-align: left;
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--color-border);
}
.gtd-review-list { list-style: none; padding: 0; }
.gtd-review-list li + li { margin-top: var(--space-2); }

/* ---- TOTP enrolment QR ---------------------------------------------- */
/* The QR SVG needs a light quiet-zone to scan reliably on the dark field. */
.totp-qr {
  display: inline-block;
  padding: var(--space-3);
  background: #fff;
  border-radius: var(--radius-xs);
}
.totp-qr svg { display: block; }

/* ---- Admin layout ---------------------------------------------------- */
/* The admin layout keeps its own (.admin-*) markup — it carries WebAuthn CSP
   nuances and no theme toggle — but reuses the shell's visual language. */
.admin-layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
.admin-header {
  position: sticky;
  top: 0;
  z-index: var(--z-overlay);
  background: color-mix(in srgb, var(--color-surface) 92%, transparent);
  border-bottom: var(--border-thick) solid var(--color-bezel-dark);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(8px);
}
.admin-header nav {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding: var(--space-3) var(--space-5);
}
.admin-header__brand {
  font-family: var(--font-plaque);
  font-weight: var(--fw-black);
  letter-spacing: var(--ls-wider);
  text-transform: uppercase;
  color: var(--color-text-strong);
}
.admin-header__user {
  margin-left: auto;
  font-family: var(--font-data);
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
}
.admin-main {
  flex: 1 1 auto;
  width: 100%;
  max-width: var(--container-wide);
  margin-inline: auto;
  padding: var(--space-7) var(--space-5);
}

/* ---- Responsive ------------------------------------------------------ */
@media (max-width: 720px) {
  .app-topbar__status { display: none; }
  /* Same non-wrapping-row trap as the landing topbar, and worse here: a
     signed-in user has four nav buttons. Wrap the row so the brand sits on
     top and the account actions drop to their own full-width row below. */
  .app-topbar__inner { flex-wrap: wrap; }
  .app-topbar__spacer { display: none; }
  .app-topbar nav { width: 100%; justify-content: flex-start; }
  /* The admin header is the same recipe (brand + auto-pushed user/actions);
     let it wrap rather than overflow on a phone. */
  .admin-header nav { flex-wrap: wrap; }
}