/* ============================================================================
   M1 APP SHELLS — Build Plan §8.4
   Five shells so a panel type is recognisable instantly across all eleven
   verticals: Super Admin · Owner/Tenant · Branch Manager · Staff/POS · Customer.

   Built ONCE. A vertical supplies nav items and content; it never rebuilds the
   chrome. Everything is logical-property based, so RTL is the dir attribute.

   Set data-shell on the shell root: super-admin | owner | branch | pos | customer
   ========================================================================= */

.m1-shell {
  min-block-size: 100vh;
  display: grid;
  grid-template-columns: var(--shell-nav-w, 16rem) 1fr;
  grid-template-rows: auto 1fr;
  grid-template-areas: 'nav top' 'nav main';
  background: var(--surface-base);
}
.m1-shell[data-collapsed='true'] { --shell-nav-w: 4.25rem; }

/* ---------------------------------------------------------------- SIDEBAR */
.m1-shell__nav {
  grid-area: nav;
  background: var(--surface-raised);
  border-inline-end: 1px solid var(--border-subtle);
  display: flex; flex-direction: column;
  position: sticky; inset-block-start: 0; block-size: 100vh;
  overflow-y: auto;
}
.m1-shell__brand {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-4) var(--space-4);
  font-family: var(--font-head); font-weight: var(--weight-bold);
  letter-spacing: -.02em; color: var(--text-primary);
  border-block-end: 1px solid var(--border-subtle);
  white-space: nowrap; overflow: hidden;
}
.m1-shell__brand-mark {
  inline-size: 2rem; block-size: 2rem; flex: none;
  border-radius: var(--radius-sm);
  background: var(--intent-brand); color: var(--text-on-brand);
  display: grid; place-items: center; font-size: var(--text-sm);
}
.m1-shell__navgroup { padding: var(--space-3) var(--space-2); }
.m1-shell__navlabel {
  padding: var(--space-2) var(--space-3) var(--space-1);
  font-size: var(--text-2xs); font-weight: var(--weight-semibold);
  text-transform: uppercase; letter-spacing: .06em; color: var(--text-muted);
  white-space: nowrap; overflow: hidden;
}
.m1-navitem {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  min-block-size: var(--tap-target);
  border-radius: var(--radius-sm);
  color: var(--text-secondary); text-decoration: none;
  font-size: var(--control-font);
  white-space: nowrap;
  transition: background-color var(--motion-fast) var(--ease-standard),
              color var(--motion-fast) var(--ease-standard);
}
.m1-navitem:hover { background: var(--surface-hover); color: var(--text-primary); }
.m1-navitem[aria-current='page'] {
  background: var(--surface-selected);
  color: var(--intent-brand-text);
  font-weight: var(--weight-medium);
}
/* the active marker is an inline-start bar, so it moves to the right in RTL */
.m1-navitem[aria-current='page'] { box-shadow: inset 0.1875rem 0 0 0 var(--intent-brand); }
[dir='rtl'] .m1-navitem[aria-current='page'] { box-shadow: inset -0.1875rem 0 0 0 var(--intent-brand); }
.m1-shell[data-collapsed='true'] .m1-navitem span,
.m1-shell[data-collapsed='true'] .m1-shell__navlabel,
.m1-shell[data-collapsed='true'] .m1-shell__brand span { display: none; }
.m1-shell__navfoot { margin-block-start: auto; padding: var(--space-3) var(--space-2); border-block-start: 1px solid var(--border-subtle); }

/* ---------------------------------------------------------------- TOPBAR */
.m1-shell__top {
  grid-area: top;
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--surface-raised);
  border-block-end: 1px solid var(--border-subtle);
  position: sticky; inset-block-start: 0; z-index: 20;
}
.m1-shell__search {
  flex: 1 1 22rem; max-inline-size: 32rem; position: relative;
  display: flex; align-items: center;
}
.m1-shell__search .m1-icon {
  position: absolute; inset-inline-start: var(--space-3); color: var(--text-muted);
  pointer-events: none;
}
.m1-shell__search .m1-input { padding-inline-start: var(--space-8); }
.m1-shell__switcher {
  display: flex; align-items: center; gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  min-block-size: var(--tap-target);
  border: 1px solid var(--border-subtle); border-radius: var(--radius-sm);
  background: var(--surface-raised); color: var(--text-secondary);
  font-size: var(--text-sm); cursor: pointer; white-space: nowrap;
}
.m1-shell__switcher:hover { background: var(--surface-hover); }
.m1-iconbtn {
  display: grid; place-items: center;
  inline-size: var(--tap-target); block-size: var(--tap-target);
  border: 0; border-radius: var(--radius-sm);
  background: transparent; color: var(--text-secondary); cursor: pointer;
  transition: background-color var(--motion-fast) var(--ease-standard);
}
.m1-iconbtn:hover { background: var(--surface-hover); color: var(--text-primary); }
.m1-avatar {
  inline-size: var(--tap-target); block-size: var(--tap-target); flex: none;
  border-radius: var(--radius-full);
  background: var(--intent-brand-surface); color: var(--intent-brand-text);
  display: grid; place-items: center;
  font-size: var(--text-sm); font-weight: var(--weight-semibold);
}

/* ---------------------------------------------------------------- MAIN */
.m1-shell__main { grid-area: main; padding: var(--space-6) var(--space-6) var(--space-16); min-inline-size: 0; }
.m1-breadcrumb { display: flex; align-items: center; gap: var(--space-2); font-size: var(--text-sm); color: var(--text-muted); margin-block-end: var(--space-3); flex-wrap: wrap; }
.m1-breadcrumb a { color: var(--text-muted); text-decoration: none; }
.m1-breadcrumb a:hover { color: var(--text-primary); text-decoration: underline; }
.m1-pagehead { display: flex; align-items: flex-start; gap: var(--space-4); margin-block-end: var(--space-6); flex-wrap: wrap; }
.m1-pagehead h1 { font-size: var(--text-3xl); margin: 0; }
.m1-pagehead__sub { color: var(--text-muted); font-size: var(--text-md); margin-block-start: var(--space-1); }

/* ============================================================================
   PER-PANEL IDENTITY
   Same chrome, different reading. The tint on the sidebar is what makes a
   super-admin console instantly not-a-branch-panel at a glance.
   ========================================================================= */

/* Super Admin — platform-wide. Inverted sidebar: you are outside any one tenant. */
.m1-shell[data-shell='super-admin'] .m1-shell__nav {
  background: var(--surface-inverse);
  border-inline-end-color: transparent;
}
.m1-shell[data-shell='super-admin'] .m1-shell__brand,
.m1-shell[data-shell='super-admin'] .m1-navitem { color: var(--text-inverse); }
.m1-shell[data-shell='super-admin'] .m1-shell__brand { border-block-end-color: rgba(255,255,255,.12); }
.m1-shell[data-shell='super-admin'] .m1-shell__navlabel { color: rgba(255,255,255,.55); }
.m1-shell[data-shell='super-admin'] .m1-navitem:hover { background: rgba(255,255,255,.08); }
.m1-shell[data-shell='super-admin'] .m1-navitem[aria-current='page'] {
  background: rgba(255,255,255,.12); color: #fff;
}
.m1-shell[data-shell='super-admin'] .m1-shell__navfoot { border-block-start-color: rgba(255,255,255,.12); }

/* Owner/Tenant — the default reading. */

/* Branch Manager — narrower nav, one branch in scope, switcher locked. */
.m1-shell[data-shell='branch'] { --shell-nav-w: 14rem; }
.m1-shell[data-shell='branch'] .m1-shell__switcher[data-locked] { opacity: .7; pointer-events: none; }

/* Staff / POS — no sidebar at all. Full bleed, action rail, thumb-reachable.
   A till is not a back office with bigger buttons. */
.m1-shell[data-shell='pos'] {
  grid-template-columns: 1fr;
  grid-template-areas: 'top' 'main';
  block-size: 100vh; overflow: hidden;
}
.m1-shell[data-shell='pos'] .m1-shell__nav { display: none; }
.m1-shell[data-shell='pos'] .m1-shell__main { padding: 0; overflow: hidden; }
.m1-pos {
  display: grid; grid-template-columns: 1fr 24rem; block-size: 100%;
  gap: 0;
}
.m1-pos__products { padding: var(--space-4); overflow-y: auto; }
.m1-pos__grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(9rem, 1fr)); gap: var(--space-3); }
.m1-pos__tile {
  display: flex; flex-direction: column; gap: var(--space-1);
  padding: var(--space-3);
  min-block-size: 5.5rem;
  border: 1px solid var(--border-subtle); border-radius: var(--radius-md);
  background: var(--surface-raised); color: var(--text-primary);
  text-align: start; cursor: pointer;
  transition: transform var(--motion-fast) var(--ease-standard),
              border-color var(--motion-fast) var(--ease-standard);
}
.m1-pos__tile:hover { border-color: var(--intent-brand); }
.m1-pos__tile:active { transform: scale(.97); }
.m1-pos__tile b { font-size: var(--text-lg); font-weight: var(--weight-semibold); }
.m1-pos__tile span { color: var(--text-muted); font-size: var(--text-sm); font-variant-numeric: tabular-nums; }
.m1-pos__cart {
  background: var(--surface-raised);
  border-inline-start: 1px solid var(--border-subtle);
  display: flex; flex-direction: column; min-block-size: 0;
}
.m1-pos__lines { flex: 1 1 auto; overflow-y: auto; padding: var(--space-3); }
.m1-pos__line { display: flex; align-items: center; gap: var(--space-3); padding-block: var(--space-2); border-block-end: 1px solid var(--border-subtle); }
.m1-pos__total { padding: var(--space-4); border-block-start: 1px solid var(--border-subtle); }
.m1-pos__total-row { display: flex; justify-content: space-between; margin-block-end: var(--space-2); font-variant-numeric: tabular-nums; }
.m1-pos__total-row--grand { font-size: var(--text-2xl); font-weight: var(--weight-bold); font-family: var(--font-head); }

/* Customer — no chrome, no sidebar. Bottom tabs on phones, which is where
   customers actually are. */
.m1-shell[data-shell='customer'] {
  grid-template-columns: 1fr;
  grid-template-areas: 'top' 'main';
}
.m1-shell[data-shell='customer'] .m1-shell__nav { display: none; }
.m1-shell[data-shell='customer'] .m1-shell__main { max-inline-size: 46rem; margin-inline: auto; inline-size: 100%; padding-block-end: 6rem; }
.m1-tabbar {
  position: fixed; inset-inline: 0; inset-block-end: 0; z-index: 30;
  display: none; justify-content: space-around;
  background: var(--surface-raised);
  border-block-start: 1px solid var(--border-subtle);
  padding-block: var(--space-2);
  padding-block-end: max(var(--space-2), env(safe-area-inset-bottom));
}
.m1-shell[data-shell='customer'] .m1-tabbar { display: flex; }
.m1-tabbar__item {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  min-inline-size: 4rem; min-block-size: 2.75rem;
  padding: var(--space-1);
  background: none; border: 0; cursor: pointer;
  color: var(--text-muted); font-size: var(--text-2xs);
}
.m1-tabbar__item[aria-current='page'] { color: var(--intent-brand-text); }

/* ---------------------------------------------------------------- RESPONSIVE
   The sidebar becomes an off-canvas drawer rather than shrinking to unusable. */
@media (max-width: 1023px) {
  .m1-shell { grid-template-columns: 1fr; grid-template-areas: 'top' 'main'; }
  .m1-shell__nav {
    position: fixed; inset-block: 0; inset-inline-start: 0;
    inline-size: 16rem; z-index: 40;
    transform: translateX(-100%);
    transition: transform var(--motion-base) var(--ease-standard);
    box-shadow: var(--elevation-3);
  }
  [dir='rtl'] .m1-shell__nav { transform: translateX(100%); }
  .m1-shell[data-navopen='true'] .m1-shell__nav { transform: translateX(0); }
  .m1-shell__main { padding: var(--space-4) var(--space-4) var(--space-12); }
  .m1-shell__search { flex-basis: 8rem; }
  .m1-pos { grid-template-columns: 1fr; }
  .m1-pos__cart { display: none; }
}
@media (min-width: 1024px) { .m1-shell__navtoggle { display: none; } }