/* =============================================
   FAB — Floating Action Button v2
   ============================================= */

/* ---- BACKDROP (body level) ---- */
.fab-backdrop {
  position: fixed;
  inset: 0;
  z-index: 2147483640;
  background: transparent;
  pointer-events: none;
  transition: background 0.2s ease;
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
}
.fab-backdrop.active {
  pointer-events: auto;
  background: rgba(0, 0, 0, 0.22);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
}

/* ---- WRAP ---- */
.fab-wrap {
  position: fixed !important;
  bottom: 24px;
  right: 18px;
  z-index: 2147483647 !important;  /* INT32 MAX */
  width: 54px;
  height: 54px;
  user-select: none;
  -webkit-touch-callout: none;
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
}

/* ---- MAIN FAB BUTTON ---- */
.fab-btn {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #7c3aed 0%, #4f46e5 100%);
  box-shadow:
    0 4px 20px rgba(124, 58, 237, 0.5),
    0 2px 6px  rgba(0, 0, 0, 0.2);
  color: #fff;
  transition: transform 0.22s cubic-bezier(.34,1.56,.64,1), background 0.2s, box-shadow 0.2s;
  z-index: 2;
}
.fab-btn:hover { transform: scale(1.08); }
.fab-btn:active { transform: scale(0.93); }
.fab-btn svg { width: 22px; height: 22px; pointer-events: none; }

.fab-wrap.fab-open .fab-btn {
  background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
  box-shadow: 0 4px 20px rgba(220, 38, 38, 0.5);
  transform: scale(1.05);
}

/* ---- FAB ITEMS ---- */
.fab-item {
  position: absolute;
  /* Default: collapsed at FAB center */
  bottom: 27px;       /* vertical center of FAB */
  right:  27px;       /* horizontal center of FAB */
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 4px 16px rgba(0,0,0,.18), 0 1px 4px rgba(0,0,0,.1);
  color: #1e1b4b;
  /* collapsed state */
  transform: translate(50%, 50%) scale(0);
  opacity: 0;
  pointer-events: none;
  transition:
    transform 0.28s cubic-bezier(.34,1.56,.64,1),
    opacity   0.2s ease;
}
.fab-item:hover {
  background: #fff;
  box-shadow: 0 6px 22px rgba(0,0,0,.22);
  transform: scale(1.12) !important;
  z-index: 1;
}
.fab-item:active { transform: scale(0.93) !important; }

/* Active state (tính năng đang bật) */
.fab-item.fab-item-active {
  background: linear-gradient(135deg, #ede9fe, #ddd6fe) !important;
  box-shadow: 0 0 0 2.5px #7c3aed, 0 4px 16px rgba(124,58,237,.3) !important;
  color: #4c1d95 !important;
}

.fab-item-icon { font-size: 18px; line-height: 1; pointer-events: none; }
.fab-item-label {
  font-size: 7.5px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: #4c1d95;
  margin-top: 1.5px;
  white-space: nowrap;
  pointer-events: none;
}

/* Dark mode */
body.dark .fab-item { background: rgba(30,27,75,.93); }
body.dark .fab-item-label { color: #c4b5fd; }

/* ---- OPEN STATE — Items xòe thành hình cung (UP-LEFT từ bottom-right corner) ---- */
/*
  Arc từ 90° (thẳng lên) → 210° (trái-xuống nhẹ), interval 30°
  Radius = 72px để items không đè lên nhau
  Tọa độ (bottom, right) tương đối với fab-wrap:
    bottom=27 right=27 là tâm FAB → dịch thêm theo arc
    
  Công thức: từ tâm (27,27), dịch (dx, dy):
    bottom += -sin(angle)*r = cos_comp  (positive = đi lên)
    right  += -cos(angle)*r             (positive = đi trái)
    
  Item 0 (90°): dx=0,   dy=-72   → bottom=27+72=99,  right=27
  Item 1 (120°): cos120=-0.5,sin120=0.866 → dx=36,dy=-62   → bottom=89, right=63
  Item 2 (150°): cos150=-0.866,sin150=0.5 → dx=62,dy=-36   → bottom=63, right=89
  Item 3 (180°): cos180=-1,sin180=0       → dx=72,dy=0      → bottom=27, right=99
  Item 4 (210°): cos210=-0.866,sin210=-0.5→ dx=62,dy=36     → bottom=-9→clamp, right=89
  
  Item 4 goes slightly below FAB, which is fine since FAB is 24px from bottom.
*/

/* Position is now handled dynamically via JS (fab.js) */

/* ---- PULSE khi mới vào ---- */
@keyframes fab-appear-pulse {
  0%   { box-shadow: 0 4px 20px rgba(124,58,237,.5), 0 0 0 0   rgba(124,58,237,.4); }
  60%  { box-shadow: 0 4px 20px rgba(124,58,237,.5), 0 0 0 12px rgba(124,58,237,0); }
  100% { box-shadow: 0 4px 20px rgba(124,58,237,.5), 0 0 0 0   rgba(124,58,237,0); }
}
.fab-btn { animation: fab-appear-pulse 2s ease-out 1.5s 2; }

/* ---- PRINT: ẩn FAB ---- */
@media print {
  .fab-wrap,
  .fab-backdrop { display: none !important; }
}

/* ---- MOBILE adjustments ---- */
@media (max-width: 768px) {
  .fab-wrap {
    bottom: 18px;
    right: 14px;
  }
}

/* ====================================
   SIDEBAR AUTH BUTTON (trong sidebar header)
   ==================================== */
.sidebar-header-actions {
  display: flex;
  align-items: center;
  gap: .3rem;
  flex-shrink: 0;
}

.sidebar-auth-btn {
  display: flex;
  align-items: center;
  gap: .3rem;
  padding: .25rem .55rem;
  border-radius: 99px;
  border: 1px solid var(--border);
  background: var(--bg-overlay);
  color: var(--text-secondary);
  font-size: .75rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
  white-space: nowrap;
  max-width: 110px;
}
.sidebar-auth-btn:hover {
  background: var(--bg-raised);
  border-color: var(--accent);
  color: var(--accent);
}
.sidebar-auth-btn svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}
.sidebar-auth-name {
  max-width: 70px;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── Role badge (hiện ngay sau tên user) ── */
.sidebar-role-badge {
  display: inline-block;
  padding: .1rem .4rem;
  border-radius: 99px;
  font-size: .65rem;
  font-weight: 700;
  letter-spacing: .02em;
  white-space: nowrap;
  line-height: 1.4;
  flex-shrink: 0;
}
.sidebar-role-badge.role-badge-admin {
  background: rgba(109,40,217,.15);
  color: var(--accent);
  border: 1px solid rgba(109,40,217,.3);
}
.sidebar-role-badge.role-badge-banhat {
  background: rgba(5,150,105,.12);
  color: #059669;
  border: 1px solid rgba(5,150,105,.25);
}