/* ============================================
   APP SHELL
   ============================================ */
.app {
  display: grid;
  grid-template-areas:
    "header header"
    "sidebar main";
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-rows: var(--header-height) 1fr;
  min-height: 100vh;
  transition: grid-template-columns var(--transition-base);
}

.app.sidebar-collapsed {
  grid-template-columns: var(--sidebar-collapsed) 1fr;
}

/* ============================================
   HEADER
   ============================================ */
.app-header {
  grid-area: header;
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0 var(--space-4);
  height: var(--header-height);
  background: var(--header-bg);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid var(--border-subtle);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.125rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}
.brand-icon {
  font-size: 1.5rem;
  color: var(--accent);
}

.header-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.icon-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: grid;
  place-items: center;
  color: var(--text-secondary);
  position: relative;
  transition: all var(--transition-fast);
}
.icon-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}
.icon-btn:active { transform: scale(0.94); }

.badge-dot {
  position: absolute;
  top: 8px;
  right: 10px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--danger);
  border: 2px solid var(--header-bg);
}

.user-chip {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 4px 12px 4px 4px;
  border-radius: var(--radius-full);
  background: var(--bg-muted);
  cursor: pointer;
  transition: background var(--transition-fast);
}
.user-chip:hover { background: var(--bg-hover); }

.avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand-500), var(--brand-700));
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 0.8rem;
}
.user-name {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
}

/* ============================================
   SIDEBAR
   ============================================ */
.sidebar {
  grid-area: sidebar;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: transform var(--transition-base);
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-3);
}

.nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 12px 14px;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.925rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  position: relative;
}
.nav-link i {
  width: 20px;
  text-align: center;
  font-size: 1.05rem;
}
.nav-link:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}
.nav-link.active {
  background: var(--accent-soft);
  color: var(--accent-text);
  font-weight: 600;
}
.nav-link.active::before {
  content: '';
  position: absolute;
  left: -12px;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 22px;
  background: var(--accent);
  border-radius: 0 4px 4px 0;
}

.nav-link-danger:hover {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger);
}

.nav-divider {
  height: 1px;
  background: var(--border-subtle);
  margin: var(--space-3) var(--space-2);
}

.sidebar-footer {
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--border-subtle);
  color: var(--text-tertiary);
  font-size: 0.75rem;
  text-align: center;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(2px);
  z-index: 90;
  opacity: 0;
  transition: opacity var(--transition-base);
}

/* ============================================
   MAIN CONTENT
   ============================================ */
.main-content {
  grid-area: main;
  overflow-y: auto;
  padding: var(--space-6);
  min-height: calc(100vh - var(--header-height));
}

.page-container {
  max-width: 1400px;
  margin: 0 auto;
  animation: fadeInUp 0.3s ease;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   BOTTOM NAV (Mobile)
   ============================================ */
.bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--bottom-nav-height);
  padding-bottom: env(safe-area-inset-bottom);
  background: var(--bottom-nav-bg);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-top: 1px solid var(--border-subtle);
  z-index: 95;
  justify-content: space-around;
  align-items: center;
}

.bottom-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 8px 12px;
  color: var(--text-tertiary);
  font-size: 0.7rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  flex: 1;
  max-width: 80px;
}
.bottom-item i { font-size: 1.25rem; }
.bottom-item.active { color: var(--accent); }

.bottom-item-fab {
  position: relative;
  top: -14px;
}
.fab-circle {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand-500), var(--brand-700));
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 1.25rem;
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.4);
  transition: transform var(--transition-fast);
}
.bottom-item-fab:active .fab-circle { transform: scale(0.92); }

/* ============================================
   RESPONSIVO
   ============================================ */
@media (max-width: 1024px) {
  .user-name { display: none; }
}

@media (max-width: 768px) {
  .app {
    grid-template-columns: 1fr;
    grid-template-areas:
      "header"
      "main";
  }

  .main-content {
    padding: var(--space-4) var(--space-3);
    padding-bottom: calc(var(--bottom-nav-height) + var(--space-4));
  }

  .sidebar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    bottom: 0;
    width: 280px;
    z-index: 95;
    transform: translateX(-100%);
    box-shadow: var(--shadow-lg);
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar-overlay.open { display: block; opacity: 1; }

  .bottom-nav { display: flex; }

  .brand-name { display: none; }
  .user-chip { padding: 4px; }
  .user-chip .fa-chevron-down { display: none; }
}

@media (max-width: 480px) {
  .app-header { padding: 0 var(--space-3); }
  .main-content { padding: var(--space-3); }
}