/* ── Design Tokens — Light Mode ──────────────────────────────────────────────── */
:root {
  /* Brand */
  --navy:       #0D2137;
  --teal:       #0A7EA4;
  --teal-lt:    #14B8D4;
  --teal-dk:    #075E7A;

  /* Surfaces */
  --bg:         #F0F6FA;
  --surface:    #FFFFFF;
  --surface-2:  #E8F0F5;
  --border:     #D1DDE6;
  --border-lt:  #E8F0F5;

  /* Text */
  --text:       #1A2E3B;
  --text-muted: #64748B;
  --text-inv:   #FFFFFF;

  /* Semantic */
  --success:    #1D9D6C;
  --warning:    #E07B39;
  --danger:     #C0392B;
  --info:       #0A7EA4;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0,0,0,.08);
  --shadow-md:  0 4px 12px rgba(0,0,0,.10);
  --shadow-lg:  0 8px 24px rgba(0,0,0,.12);

  /* Radius */
  --radius-sm:  4px;
  --radius:     8px;
  --radius-lg:  12px;
  --radius-xl:  16px;

  /* Sidebar */
  --sidebar-bg:      #0D2137;
  --sidebar-hover:   #153248;
  --sidebar-active:  #0A7EA4;
  --sidebar-w:       260px;
  --sidebar-collapsed: 64px;

  /* Status colours */
  --status-draft:          #94A3B8;
  --status-assigned:       #0A7EA4;
  --status-scheduled:      #8B5CF6;
  --status-in_progress:    #E07B39;
  --status-pending_review: #D97706;
  --status-closed:         #1D9D6C;

  /* Status badge backgrounds (light tint) */
  --status-draft-bg:          #F1F5F9;
  --status-assigned-bg:       #E0F2FE;
  --status-scheduled-bg:      #EDE9FE;
  --status-in_progress-bg:    #FFF7ED;
  --status-pending_review-bg: #FFFBEB;
  --status-closed-bg:         #DCFCE7;

  /* Priority colours */
  --priority-low:    #64748B;
  --priority-normal: #0A7EA4;
  --priority-high:   #E07B39;
  --priority-urgent: #C0392B;

  color-scheme: light;
}

/* ── Dark Mode ───────────────────────────────────────────────────────────────── */
@media (prefers-color-scheme: dark) {
  :root { --_dark: 1; }
}
:root[data-theme="dark"] { --_dark: 1; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --navy:       #0A1929;
    --teal:       #29B6D8;
    --teal-lt:    #4DD0E8;
    --teal-dk:    #1A8FAD;

    --bg:         #081828;
    --surface:    #0F2336;
    --surface-2:  #0C1D2E;
    --border:     #1E3A52;
    --border-lt:  #1A3048;

    --text:       #E2EAF2;
    --text-muted: #8BAABF;
    --text-inv:   #FFFFFF;

    --success:    #34D399;
    --warning:    #FBBF24;
    --danger:     #F87171;
    --info:       #29B6D8;

    --shadow-sm:  0 1px 3px rgba(0,0,0,.3);
    --shadow-md:  0 4px 12px rgba(0,0,0,.4);
    --shadow-lg:  0 8px 24px rgba(0,0,0,.5);

    --sidebar-bg:     #061220;
    --sidebar-hover:  #0D1F32;
    --sidebar-active: #1A5C78;

    --status-draft-bg:          #1E2D3D;
    --status-assigned-bg:       #1E3A5F;
    --status-scheduled-bg:      #2E1F5E;
    --status-in_progress-bg:    #3D2E00;
    --status-pending_review-bg: #3D2800;
    --status-closed-bg:         #064E30;

    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --navy:       #0A1929;
  --teal:       #29B6D8;
  --teal-lt:    #4DD0E8;
  --bg:         #081828;
  --surface:    #0F2336;
  --surface-2:  #0C1D2E;
  --border:     #1E3A52;
  --border-lt:  #1A3048;
  --text:       #E2EAF2;
  --text-muted: #8BAABF;
  --shadow-sm:  0 1px 3px rgba(0,0,0,.3);
  --shadow-md:  0 4px 12px rgba(0,0,0,.4);
  color-scheme: dark;
}

/* ── Base ────────────────────────────────────────────────────────────────────── */
body {
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

a { color: var(--teal); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── App Layout (Light DOM — no shadow root) ─────────────────────────────────── */
app-root {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  grid-template-rows: 1fr;
  min-height: 100vh;
}
app-root.collapsed {
  grid-template-columns: var(--sidebar-collapsed) 1fr;
}

.app-shell {
  display: grid;
  grid-template-rows: 56px 1fr;
  min-height: 100vh;
  overflow: hidden;
}

#main-content {
  overflow-y: auto;
  padding: 1.5rem;
  background: var(--bg);
}

app-mobile-nav { display: none; }

@media (max-width: 768px) {
  app-root {
    grid-template-columns: 1fr;
    grid-template-rows: 56px 1fr 56px;
  }
  .app-shell { grid-template-rows: 1fr; }
  app-sidebar { display: none; }
  app-mobile-nav { display: flex; }
  app-topbar { display: none; }
  #main-content { padding: 1rem; }
}

/* ── Sidebar (Light DOM) ──────────────────────────────────────────────────────── */
app-sidebar {
  background: var(--sidebar-bg);
  display: flex;
  flex-direction: column;
  height: 100vh;
  position: sticky;
  top: 0;
  overflow: hidden;
  transition: width .2s ease;
}

/* ── Topbar (Light DOM) ───────────────────────────────────────────────────────── */
app-topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 1.25rem;
  height: 56px;
  gap: 1rem;
  z-index: 10;
}

/* ── Mobile Nav (Light DOM) ───────────────────────────────────────────────────── */
app-mobile-nav {
  background: var(--surface);
  border-top: 1px solid var(--border);
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 56px;
  align-items: center;
  justify-content: space-around;
  z-index: 100;
  padding-bottom: env(safe-area-inset-bottom);
}

/* ── Page Header ──────────────────────────────────────────────────────────────── */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}
.page-header h1 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
}

/* ── Cards ────────────────────────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

/* ── Buttons ──────────────────────────────────────────────────────────────────── */
button, .btn {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .5rem 1rem;
  border: none;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: .875rem;
  cursor: pointer;
  transition: opacity .15s, background .15s;
  background: var(--teal);
  color: #fff;
}
button:hover, .btn:hover { opacity: .88; }
button.ghost, .btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}
button.danger, .btn-danger {
  background: var(--danger);
  color: #fff;
}
button:disabled { opacity: .5; cursor: not-allowed; }

/* ── Utility ──────────────────────────────────────────────────────────────────── */
.text-muted { color: var(--text-muted); }
.text-sm    { font-size: .813rem; }
.mono       { font-family: var(--font-mono); }
.sr-only    { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }