@layer layout {
  .cx-shell {
    --cx-sidebar-width: 352px;
    min-height: 100vh;
    display: grid;
    grid-template-columns: var(--cx-sidebar-width) minmax(0, 1fr);
    background:
      radial-gradient(circle at top right, color-mix(in srgb, var(--cx-brand-secondary) 12%, transparent), transparent 34rem),
      var(--cx-bg);
    transition: grid-template-columns 220ms ease;
  }

  .cx-shell[data-sidebar-state="hidden"] {
    grid-template-columns: 0 minmax(0, 1fr);
  }

  .cx-sidebar {
    position: sticky;
    top: 0;
    height: 100vh;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 1.15rem;
    overflow: auto;
    background: rgba(255, 255, 255, .90);
    border-inline-end: 1px solid var(--cx-border);
    backdrop-filter: blur(18px);
    transition:
      opacity 180ms ease,
      transform 220ms ease,
      padding 220ms ease,
      border-color 180ms ease,
      inline-size 220ms ease;
  }

  .cx-shell[data-sidebar-state="hidden"] .cx-sidebar {
    inline-size: 0;
    padding-inline: 0;
    opacity: 0;
    pointer-events: none;
    overflow: hidden;
    border-inline-end-color: transparent;
    transform: translateX(1.25rem);
  }

  .cx-brand-block {
    display: flex;
    align-items: center;
    gap: var(--cx-space-3);
    padding: var(--cx-space-3);
    border-radius: var(--cx-radius-lg);
    background: linear-gradient(135deg, var(--cx-brand-soft), color-mix(in srgb, var(--cx-surface) 72%, transparent));
    border: 1px solid color-mix(in srgb, var(--cx-brand-secondary) 12%, transparent);
    box-shadow: 0 10px 28px color-mix(in srgb, var(--cx-brand-secondary) 6%, transparent);
  }

  .cx-brand-mark {
    inline-size: 46px;
    block-size: 46px;
    display: grid;
    place-items: center;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--cx-brand), var(--cx-brand-strong));
    color: white;
    font-weight: 800;
    box-shadow: var(--cx-shadow-soft);
  }

  .cx-nav {
    display: grid;
    align-content: start;
    gap: .35rem;
    padding: .35rem .2rem 1.25rem;
  }

  .cx-nav-group {
    display: grid;
    gap: .18rem;
    padding: .22rem 0 .34rem;
    border: 0;
    border-radius: 0;
    background: transparent;
    border-block-end: 1px solid color-mix(in srgb, var(--cx-brand-secondary) 8%, transparent);
    transition: background var(--cx-transition);
  }

  .cx-nav-group:last-child { border-block-end: 0; }

  .cx-nav-group[data-open="true"] {
    background: transparent;
  }

  .cx-nav-group[data-active-group] {
    background: linear-gradient(90deg, color-mix(in srgb, var(--cx-brand-soft) 66%, transparent), transparent 82%);
  }

  .cx-nav-group-title {
    width: 100%;
    border: 0;
    background: transparent;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: .65rem;
    color: var(--cx-ink);
    font: inherit;
    font-size: .94rem;
    font-weight: 900;
    padding: .72rem .78rem;
    border-radius: .9rem;
    cursor: pointer;
    text-align: start;
    transition: background var(--cx-transition), color var(--cx-transition), transform var(--cx-transition);
  }

  .cx-nav-group-title:hover {
    background: color-mix(in srgb, var(--cx-brand-secondary) 8%, transparent);
    color: var(--cx-brand-strong);
  }

  .cx-nav-group-main {
    display: inline-flex;
    align-items: center;
    gap: .58rem;
    min-width: 0;
  }

  .cx-nav-group-icon {
    inline-size: 1.7rem;
    display: inline-grid;
    place-items: center;
    flex: 0 0 auto;
  }

  .cx-nav-group-caret {
    inline-size: 1.65rem;
    block-size: 1.65rem;
    border-radius: 999px;
    display: inline-grid;
    place-items: center;
    color: var(--cx-muted);
    background: rgba(16, 42, 45, .045);
    transition: transform 180ms ease, background var(--cx-transition), color var(--cx-transition);
  }

  .cx-nav-group[data-open="true"] .cx-nav-group-caret {
    transform: rotate(180deg);
    color: var(--cx-brand-strong);
    background: var(--cx-brand-soft);
  }

  .cx-nav-group-pages {
    display: grid;
    gap: .24rem;
    padding: .08rem .28rem .32rem .12rem;
  }

  .cx-nav-group-pages[hidden] {
    display: none !important;
  }

  .cx-nav-link {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: .7rem;
    padding: .86rem 1rem;
    border-radius: .88rem;
    color: var(--cx-muted);
    border: 1px solid transparent;
    background: transparent;
    transition: background var(--cx-transition), color var(--cx-transition), transform var(--cx-transition), border-color var(--cx-transition), box-shadow var(--cx-transition);
  }

  .cx-nav-link-label {
    display: inline-flex;
    align-items: center;
    min-width: 0;
    gap: .58rem;
    font-size: .95rem;
    font-weight: 780;
    flex: 1 1 auto;
  }

  .cx-nav-link-text {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.35;
  }

  .cx-nav-link:hover {
    background: color-mix(in srgb, var(--cx-brand-secondary) 10%, transparent);
    color: var(--cx-brand-strong);
    transform: translateX(-2px);
    border-color: color-mix(in srgb, var(--cx-brand-secondary) 18%, transparent);
  }

  .cx-nav-link[aria-current="page"],
  .cx-nav-link.is-active {
    background: linear-gradient(135deg, rgba(15, 118, 110, .16), color-mix(in srgb, var(--cx-brand-accent) 10%, transparent));
    color: var(--cx-brand-strong);
    border-color: color-mix(in srgb, var(--cx-brand-secondary) 25%, transparent);
    box-shadow: inset 4px 0 0 var(--cx-brand-strong), 0 8px 18px color-mix(in srgb, var(--cx-brand-secondary) 8%, transparent);
  }

  .cx-nav-link[aria-current="page"]::after,
  .cx-nav-link.is-active::after {
    content: '';
    inline-size: .48rem;
    block-size: .48rem;
    border-radius: 999px;
    background: var(--cx-brand-strong);
    box-shadow: 0 0 0 5px color-mix(in srgb, var(--cx-brand-secondary) 10%, transparent);
    position: absolute;
    inset-inline-start: .56rem;
    top: 50%;
    transform: translateY(-50%);
  }

  .cx-nav-icon {
    display: inline-flex;
    inline-size: 1.55rem;
    justify-content: center;
    flex: 0 0 auto;
  }

  .cx-nav-link small {
    color: var(--cx-muted);
    font-size: .68rem;
    font-weight: 900;
    white-space: nowrap;
    border-radius: 999px;
    padding: .12rem .44rem;
    background: rgba(16, 42, 45, .045);
  }

  .cx-nav-link[aria-current="page"] small,
  .cx-nav-link.is-active small {
    color: var(--cx-brand-strong);
    background: color-mix(in srgb, var(--cx-brand-secondary) 10%, transparent);
  }



  .cx-nav-link small,
  .cx-nav-status,
  .cx-nav-marker {
    display: none !important;
  }

  .cx-main {
    min-width: 0;
    display: grid;
    grid-template-rows: var(--cx-topbar-height) minmax(0, 1fr);
  }

  .cx-topbar {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--cx-space-4);
    padding: 0 var(--cx-space-6);
    background: rgba(238, 248, 247, .88);
    border-block-end: 1px solid var(--cx-border);
    backdrop-filter: blur(18px);
  }

  .cx-topbar-start {
    min-width: 0;
    display: flex;
    align-items: center;
    gap: .8rem;
  }

  .cx-sidebar-toggle {
    position: relative;
    flex: 0 0 auto;
    min-height: 2.55rem;
    padding-inline: .78rem 1rem;
    border-color: color-mix(in srgb, var(--cx-brand-secondary) 18%, transparent) !important;
    background: rgba(255, 255, 255, .72) !important;
    box-shadow: 0 8px 22px color-mix(in srgb, var(--cx-brand-secondary) 8%, transparent);
  }

  .cx-sidebar-toggle:hover {
    background: var(--cx-brand-soft) !important;
    color: var(--cx-brand-strong) !important;
  }

  .cx-sidebar-toggle-icon {
    font-size: 1.12rem;
    line-height: 1;
  }

  .cx-shell[data-sidebar-state="hidden"] .cx-sidebar-toggle {
    color: var(--cx-brand-strong);
    border-color: rgba(15, 118, 110, .28) !important;
    background: rgba(236, 253, 245, .90) !important;
  }

  .cx-topbar-title-block {
    display: grid;
    gap: .18rem;
    min-width: 0;
  }

  .cx-topbar-title-block strong {
    color: var(--cx-ink);
    font-size: 1.03rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .cx-topbar-actions {
    justify-content: flex-end;
  }

  .cx-shell-owner-pill {
    max-width: 210px;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .cx-content {
    min-width: 0;
    padding: var(--cx-space-6);
    transition: padding 180ms ease;
  }

  @media (max-width: 960px) {
    .cx-shell,
    .cx-shell[data-sidebar-state="hidden"] {
      grid-template-columns: 1fr;
    }

    .cx-sidebar {
      position: fixed;
      z-index: 40;
      inset-block: 0;
      inset-inline-start: 0;
      inline-size: min(92vw, 360px);
      height: 100vh;
      box-shadow: -18px 0 42px rgba(16, 42, 45, .18);
      transform: translateX(0);
    }

    .cx-shell[data-sidebar-state="hidden"] .cx-sidebar {
      inline-size: min(92vw, 360px);
      padding: var(--cx-space-5);
      opacity: 0;
      pointer-events: none;
      transform: translateX(110%);
      border-inline-end-color: transparent;
    }

    .cx-topbar {
      min-height: var(--cx-topbar-height);
      height: auto;
      flex-direction: column;
      align-items: stretch;
      padding: var(--cx-space-4);
    }

    .cx-topbar-start {
      width: 100%;
      justify-content: space-between;
    }

    .cx-topbar-actions {
      justify-content: stretch;
    }

    .cx-main { grid-template-rows: auto minmax(0, 1fr); }
  }

  @media (max-width: 620px) {
    .cx-sidebar-toggle [data-sidebar-toggle-text] { display: none; }
    .cx-content { padding: var(--cx-space-4); }
    .cx-topbar-title-block strong { font-size: .96rem; }
  }
}

@layer layout {
  .cx-shell-session-card {
    border: 1px solid color-mix(in srgb, var(--cx-brand-secondary) 10%, transparent);
    border-radius: var(--cx-radius-lg);
    background: rgba(255, 255, 255, .58);
    padding: .9rem 1rem;
    display: grid;
    gap: .2rem;
  }
  .cx-shell-session-card strong {
    color: var(--cx-ink);
    font-size: .96rem;
  }
  .cx-shell-session-label {
    color: var(--cx-muted);
    font-size: .72rem;
    font-weight: 900;
    letter-spacing: .02em;
  }

  .cx-auth-page {
    min-height: calc(100vh - var(--cx-topbar-height) - 2 * var(--cx-space-6));
    display: grid;
    grid-template-columns: minmax(0, .9fr) minmax(320px, 460px);
    gap: var(--cx-space-6);
    align-items: center;
  }
  .cx-auth-hero {
    border-radius: calc(var(--cx-radius-lg) + .4rem);
    background:
      radial-gradient(circle at top right, color-mix(in srgb, var(--cx-brand-secondary) 18%, transparent), transparent 24rem),
      linear-gradient(135deg, rgba(236,253,245,.92), rgba(255,255,255,.76));
    border: 1px solid color-mix(in srgb, var(--cx-brand-secondary) 14%, transparent);
    box-shadow: var(--cx-shadow-soft);
    padding: clamp(1.25rem, 4vw, 2.6rem);
    display: grid;
    gap: .8rem;
  }
  .cx-auth-hero h1 {
    margin: 0;
    color: var(--cx-ink);
    font-size: clamp(2rem, 5vw, 3.25rem);
  }
  .cx-auth-hero p {
    margin: 0;
    color: var(--cx-muted);
    max-width: 48ch;
    line-height: 1.85;
    font-weight: 750;
  }
  .cx-auth-brand-mark { inline-size: 58px; block-size: 58px; font-size: 1.25rem; }
  .cx-auth-panel { align-self: center; box-shadow: 0 18px 42px rgba(15,42,45,.09); }
  .cx-auth-owner {
    color: var(--cx-muted);
    background: color-mix(in srgb, var(--cx-brand-secondary) 8%, transparent);
    border-radius: 999px;
    padding: .28rem .65rem;
    font-size: .74rem;
    font-weight: 900;
  }
  .cx-password-field {
    position: relative;
    display: block;
  }
  .cx-password-field .cx-input { padding-inline-end: 4.9rem; }
  [dir="rtl"] .cx-password-field .cx-input { padding-inline-end: .85rem; padding-inline-start: 4.9rem; }
  .cx-password-toggle {
    position: absolute;
    inset-inline-end: .42rem;
    top: 50%;
    transform: translateY(-50%);
    border: 0;
    border-radius: 999px;
    background: color-mix(in srgb, var(--cx-brand-secondary) 9%, transparent);
    color: var(--cx-brand-strong);
    padding: .35rem .7rem;
    font-weight: 900;
    cursor: pointer;
  }
  [dir="rtl"] .cx-password-toggle { inset-inline-end: auto; inset-inline-start: .42rem; }
  .cx-password-toggle:hover { background: color-mix(in srgb, var(--cx-brand-secondary) 16%, transparent); }

  @media (max-width: 960px) {
    .cx-auth-page { grid-template-columns: 1fr; align-items: stretch; }
    .cx-auth-hero { min-height: auto; }
  }
  @media (max-width: 620px) {
    .cx-auth-page { min-height: auto; gap: var(--cx-space-4); }
    .cx-auth-hero, .cx-auth-panel { border-radius: var(--cx-radius-lg); }
  }
}

/* Phase 31C — Costix logo-aligned App Shell contrast */
@layer layout {
  .cx-shell {
    background:
      radial-gradient(circle at 8% 0%, rgba(216, 59, 190, .10), transparent 28rem),
      radial-gradient(circle at 100% 0%, rgba(36, 16, 102, .10), transparent 32rem),
      var(--cx-bg);
  }
  [data-theme="dark"] .cx-shell {
    background:
      radial-gradient(circle at 5% 0%, rgba(216, 59, 190, .18), transparent 30rem),
      radial-gradient(circle at 98% 4%, rgba(139, 92, 246, .18), transparent 34rem),
      linear-gradient(180deg, #0d0920 0%, #120b2b 100%);
  }

  .cx-sidebar {
    background: color-mix(in srgb, var(--cx-surface) 92%, transparent);
    border-inline-end: 1px solid var(--cx-border);
  }
  [data-theme="dark"] .cx-sidebar {
    background: linear-gradient(180deg, rgba(20, 13, 47, .98), rgba(13, 9, 32, .96));
  }

  .cx-brand-block {
    background:
      radial-gradient(circle at 16% 18%, rgba(255,255,255,.26), transparent 8rem),
      var(--cx-brand-gradient);
    border-color: rgba(255,255,255,.18);
    color: #fff;
  }
  .cx-brand-block .cx-help { color: rgba(255,255,255,.72); }
  .cx-brand-mark {
    background: rgba(255,255,255,.14);
    border: 1px solid rgba(255,255,255,.22);
    color: #fff;
    position: relative;
    overflow: hidden;
  }
  .cx-brand-mark::after {
    content: '';
    position: absolute;
    inset: 9px;
    border: 3px solid rgba(255,255,255,.74);
    border-left-color: transparent;
    border-bottom-color: rgba(216,59,190,.92);
    border-radius: 999px;
    transform: rotate(-28deg);
    opacity: .9;
  }

  .cx-nav-group { border-block-end-color: color-mix(in srgb, var(--cx-border) 72%, transparent); }
  .cx-nav-group[data-active-group] { background: linear-gradient(90deg, rgba(91,26,163,.10), transparent 82%); }
  [data-theme="dark"] .cx-nav-group[data-active-group] { background: linear-gradient(90deg, rgba(216,59,190,.12), transparent 84%); }
  .cx-nav-group-title { color: var(--cx-text); }
  .cx-nav-group-title:hover { background: rgba(91, 26, 163, .08); color: var(--cx-brand-strong); }
  [data-theme="dark"] .cx-nav-group-title:hover { background: rgba(216, 59, 190, .10); }
  .cx-nav-group-caret { background: rgba(91, 26, 163, .07); color: var(--cx-muted); }
  [data-theme="dark"] .cx-nav-group-caret { background: rgba(255, 255, 255, .06); }

  .cx-nav-link { color: var(--cx-muted); }
  .cx-nav-link:hover {
    background: rgba(91, 26, 163, .08);
    color: var(--cx-brand-strong);
    border-color: rgba(216, 59, 190, .18);
  }
  [data-theme="dark"] .cx-nav-link:hover { background: rgba(216, 59, 190, .10); color: #fff; }
  .cx-nav-link[aria-current="page"],
  .cx-nav-link.is-active {
    background: linear-gradient(135deg, rgba(91, 26, 163, .14), rgba(216, 59, 190, .08));
    color: var(--cx-brand-strong);
    border-color: rgba(216, 59, 190, .28);
    box-shadow: inset 4px 0 0 var(--cx-brand-accent), 0 10px 22px rgba(36, 16, 102, .08);
  }
  [data-theme="dark"] .cx-nav-link[aria-current="page"],
  [data-theme="dark"] .cx-nav-link.is-active {
    color: #fff;
    background: linear-gradient(135deg, rgba(139, 92, 246, .22), rgba(216, 59, 190, .14));
    border-color: rgba(216, 59, 190, .34);
    box-shadow: inset 4px 0 0 var(--cx-brand-accent), 0 12px 26px rgba(0,0,0,.22);
  }
  .cx-nav-link[aria-current="page"]::after,
  .cx-nav-link.is-active::after {
    background: var(--cx-brand-accent);
    box-shadow: 0 0 0 5px rgba(216, 59, 190, .14);
  }

  .cx-topbar {
    background: color-mix(in srgb, var(--cx-surface) 84%, transparent);
    border-block-end-color: var(--cx-border);
  }
  [data-theme="dark"] .cx-topbar { background: rgba(13, 9, 32, .78); }
  .cx-sidebar-toggle {
    border-color: var(--cx-control-border) !important;
    background: var(--cx-control-bg) !important;
  }
  .cx-sidebar-toggle:hover { background: var(--cx-brand-soft) !important; color: var(--cx-brand-strong) !important; }
  .cx-shell[data-sidebar-state="hidden"] .cx-sidebar-toggle {
    color: var(--cx-brand-strong);
    border-color: rgba(216, 59, 190, .28) !important;
    background: var(--cx-control-bg) !important;
  }

  .cx-shell-session-card {
    border-color: var(--cx-border);
    background: color-mix(in srgb, var(--cx-surface) 76%, transparent);
  }
  .cx-shell-session-card strong { color: var(--cx-text); }
}

/* Phase 31D — real Costix logo, customer company context, and current branch placement */
@layer layout {
  .cx-brand-block {
    align-items: center;
    gap: .82rem;
    min-height: 74px;
  }
  .cx-brand-logo {
    inline-size: 46px;
    block-size: 46px;
    object-fit: contain;
    border-radius: 14px;
    background: rgba(255,255,255,.92);
    padding: .32rem;
    box-shadow: 0 10px 22px rgba(0,0,0,.14);
    flex: 0 0 auto;
  }
  .cx-brand-copy { display: grid; gap: .1rem; min-width: 0; }
  .cx-brand-copy strong { font-size: 1.18rem; letter-spacing: .01em; }
  .cx-brand-block .cx-brand-mark { display: none !important; }

  .cx-shell-company-card {
    border: 1px solid var(--cx-border);
    border-radius: var(--cx-radius-lg);
    background: linear-gradient(135deg, rgba(91,26,163,.075), rgba(216,59,190,.045)), color-mix(in srgb, var(--cx-surface) 78%, transparent);
    padding: .86rem 1rem;
    display: grid;
    gap: .2rem;
  }
  .cx-shell-company-card strong {
    color: var(--cx-text);
    font-size: .98rem;
    line-height: 1.35;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  [data-theme="dark"] .cx-shell-company-card {
    background: linear-gradient(135deg, rgba(139,92,246,.14), rgba(216,59,190,.08)), rgba(255,255,255,.035);
  }

  .cx-current-branch-pill {
    min-height: var(--cx-control-height);
    display: inline-flex;
    align-items: center;
    gap: .52rem;
    padding: .4rem .82rem;
    border: 1px solid var(--cx-control-border);
    border-radius: 999px;
    background: color-mix(in srgb, var(--cx-surface) 78%, transparent);
    color: var(--cx-text);
    box-shadow: 0 8px 18px rgba(36,16,102,.045);
    max-inline-size: 260px;
  }
  .cx-current-branch-pill span {
    color: var(--cx-muted);
    font-weight: 900;
    font-size: .75rem;
    white-space: nowrap;
  }
  .cx-current-branch-pill strong {
    color: var(--cx-brand-strong);
    font-weight: 950;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  [data-theme="dark"] .cx-current-branch-pill {
    background: rgba(255,255,255,.045);
    border-color: rgba(216,59,190,.24);
  }

  @media (max-width: 960px) {
    .cx-current-branch-pill { max-inline-size: 100%; justify-content: space-between; }
  }
  @media (max-width: 620px) {
    .cx-brand-logo { inline-size: 42px; block-size: 42px; }
    .cx-current-branch-pill { width: 100%; }
  }
}