/* ============================================================
   DNA HUB — APP SHELL
   Layout principale: Header, Sidebar, Main Content
   ============================================================ */

body.app-body {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-rows: var(--header-height) 1fr;
  grid-template-areas:
    "sidebar header"
    "sidebar main";
  height: 100vh;
  overflow: hidden;
  background-color: var(--color-bg);
  transition: grid-template-columns var(--motion-base) var(--ease-standard);
}

/* Sidebar Collassata */
body.app-body.is-collapsed {
  grid-template-columns: var(--sidebar-width-collapsed) 1fr;
}

/* ==================== SIDEBAR ==================== */
.app-sidebar {
  grid-area: sidebar;
  background-color: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  height: 100vh;
  z-index: 10;
}

.sidebar-header {
  height: var(--header-height);
  display: flex;
  align-items: center;
  padding: 0 var(--space-4);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
  font-weight: var(--weight-bold);
  font-size: var(--text-md);
  white-space: nowrap;
  overflow: hidden;
}
.sidebar-logo:hover { text-decoration: none; }
.sidebar-logo svg { flex-shrink: 0; color: var(--color-primary); }

.sidebar-logo-text {
  transition: opacity var(--motion-fast) var(--ease-standard);
}
body.is-collapsed .sidebar-logo-text { opacity: 0; pointer-events: none; }

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4) var(--space-2);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

/* Gruppi Menu */
.nav-group {
  margin-bottom: var(--space-4);
}

.nav-group-title {
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-secondary);
  padding: var(--space-2) var(--space-3);
  white-space: nowrap;
  overflow: hidden;
  transition: opacity var(--motion-fast);
}
body.is-collapsed .nav-group-title { opacity: 0; }

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  cursor: pointer;
  transition: background var(--motion-fast), color var(--motion-fast);
  white-space: nowrap;
  overflow: hidden;
}

.nav-item:hover {
  background-color: var(--color-surface-hover);
  color: var(--color-text);
  text-decoration: none;
}

.nav-item.is-active {
  background-color: var(--color-primary-subtle);
  color: var(--color-primary-hover);
}

.nav-item svg {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}

.nav-item-text {
  transition: opacity var(--motion-fast);
}
body.is-collapsed .nav-item-text { opacity: 0; }

/* Footer Sidebar (Utente) */
.sidebar-footer {
  padding: var(--space-4);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}
.sidebar-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-primary-subtle);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--weight-bold);
  font-size: var(--text-sm);
  flex-shrink: 0;
}
.sidebar-user-info {
  display: flex;
  flex-direction: column;
  white-space: nowrap;
  overflow: hidden;
  transition: opacity var(--motion-fast);
}
body.is-collapsed .sidebar-user-info { opacity: 0; display: none; }
.sidebar-user-name { font-size: var(--text-sm); font-weight: var(--weight-semibold); }
.sidebar-user-role { font-size: var(--text-xs); color: var(--color-text-secondary); }


/* ==================== HEADER ==================== */
.app-header {
  grid-area: header;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-6);
  height: var(--header-height);
  z-index: 5;
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.btn-toggle-sidebar {
  background: none;
  border: none;
  color: var(--color-text-secondary);
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}
.btn-toggle-sidebar:hover { background: var(--color-surface-hover); color: var(--color-text); }

.header-search {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0 var(--space-3);
  height: 36px;
  width: 300px;
  cursor: pointer;
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  transition: border-color var(--motion-fast);
}
.header-search:hover { border-color: var(--color-border-strong); }

.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.header-action-btn {
  background: none;
  border: none;
  color: var(--color-text-secondary);
  cursor: pointer;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: background var(--motion-fast);
}
.header-action-btn:hover { background: var(--color-surface-hover); color: var(--color-text); }

/* Badge Notifiche */
.notification-badge {
  position: absolute;
  top: 4px;
  right: 4px;
  background: var(--color-danger);
  color: #fff;
  font-size: 10px;
  font-weight: bold;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--color-surface);
}

/* ==================== MAIN CONTENT ==================== */
.app-main {
  grid-area: main;
  overflow-y: auto;
  padding: var(--space-8);
  position: relative;
}

.page-header {
  margin-bottom: var(--space-8);
}
.page-title {
  font-size: var(--text-2xl);
  font-weight: var(--weight-bold);
  color: var(--color-text);
}
.page-subtitle {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  margin-top: var(--space-1);
}