/* Reset & Base Setup */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--hub-bg-canvas);
  color: var(--hub-text-primary);
  font-family: var(--hub-font-sans);
  -webkit-font-smoothing: antialiased;
}

/* App Shell Container */
.hub-shell {
  display: flex;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

/* Sidebar / Workspace Switcher */
.hub-sidebar {
  width: var(--hub-sidebar-width);
  height: 100%;
  background-color: var(--hub-bg-sidebar);
  border-right: 1px solid var(--hub-border-subtle);
  display: flex;
  flex-direction: column;
  user-select: none;
  z-index: 20;
  transition: width 0.2s ease;
}

.hub-brand {
  height: var(--hub-header-height);
  padding: 0 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-bottom: 1px solid var(--hub-border-subtle);
}

.hub-logo-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--hub-radius-md);
  background: linear-gradient(135deg, var(--hub-accent-current), #4f46e5);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  color: #ffffff;
  box-shadow: 0 0 12px var(--hub-accent-glow-current);
}

.hub-brand-text {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--hub-text-primary);
}

.hub-brand-badge {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  background: var(--hub-bg-active);
  padding: 2px 6px;
  border-radius: var(--hub-radius-full);
  color: var(--hub-text-secondary);
  border: 1px solid var(--hub-border-subtle);
}

/* Universes Switcher List */
.hub-nav-section {
  padding: 1rem 0.75rem 0.5rem;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--hub-text-muted);
}

.hub-universes-list {
  list-style: none;
  padding: 0 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  flex: 1;
  overflow-y: auto;
}

.hub-universe-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 0.75rem;
  border-radius: var(--hub-radius-md);
  background: transparent;
  border: 1px solid transparent;
  color: var(--hub-text-secondary);
  cursor: pointer;
  text-align: left;
  transition: all 0.15s ease;
  position: relative;
}

.hub-universe-btn:hover {
  background-color: var(--hub-bg-card-hover);
  color: var(--hub-text-primary);
}

.hub-universe-btn.active {
  background-color: var(--hub-bg-card);
  border-color: var(--hub-border-medium);
  color: var(--hub-text-primary);
}

.hub-universe-btn.active::before {
  content: "";
  position: absolute;
  left: -0.5rem;
  top: 15%;
  height: 70%;
  width: 4px;
  border-radius: var(--hub-radius-full);
  background-color: var(--item-accent, var(--hub-accent-current));
  box-shadow: 0 0 8px var(--item-accent, var(--hub-accent-current));
}

.hub-universe-avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--hub-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  background-color: var(--hub-bg-canvas);
  color: var(--item-accent, var(--hub-text-primary));
  border: 1px solid var(--hub-border-subtle);
  flex-shrink: 0;
}

.hub-universe-btn.active .hub-universe-avatar {
  background-color: var(--item-accent, var(--hub-accent-current));
  color: #ffffff;
  border-color: transparent;
}

.hub-universe-info {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  flex: 1;
}

.hub-universe-name {
  font-size: 0.875rem;
  font-weight: 600;
  white-space: nowrap;
  text-overflow: ellipsis;
  overflow: hidden;
}

.hub-universe-tagline {
  font-size: 0.725rem;
  color: var(--hub-text-muted);
  white-space: nowrap;
  text-overflow: ellipsis;
  overflow: hidden;
}

.hub-status-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--hub-radius-full);
  background-color: var(--hub-status-offline);
  flex-shrink: 0;
}

.hub-status-dot.online {
  background-color: var(--hub-status-online);
  box-shadow: 0 0 6px rgba(16, 185, 129, 0.6);
}

/* Sidebar Footer */
.hub-sidebar-footer {
  padding: 0.75rem;
  border-top: 1px solid var(--hub-border-subtle);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.hub-tool-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  border-radius: var(--hub-radius-sm);
  background: transparent;
  border: 1px solid var(--hub-border-subtle);
  color: var(--hub-text-secondary);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

.hub-tool-btn:hover {
  background-color: var(--hub-bg-card-hover);
  color: var(--hub-text-primary);
}

/* Main View Area */
.hub-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  background-color: var(--hub-bg-canvas);
}

/* Universe Topbar */
.hub-topbar {
  height: var(--hub-header-height);
  background-color: var(--hub-bg-sidebar);
  border-bottom: 1px solid var(--hub-border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.25rem;
  z-index: 10;
}

.hub-topbar-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.hub-active-title {
  font-size: 1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.hub-scope-pill {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--hub-radius-full);
  background-color: var(--hub-bg-card);
  border: 1px solid var(--hub-border-medium);
  color: var(--hub-accent-current);
}

.hub-topbar-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* View Canvas (Iframe Workspace Container) */
.hub-canvas {
  flex: 1;
  width: 100%;
  height: calc(100% - var(--hub-header-height));
  position: relative;
  background-color: var(--hub-bg-canvas);
}

.hub-workspace-iframe {
  width: 100%;
  height: 100%;
  border: none;
  background-color: transparent;
  display: block;
}

/* Loading Overlay */
.hub-loader-overlay {
  position: absolute;
  inset: 0;
  background-color: var(--hub-bg-canvas);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  z-index: 5;
  transition: opacity 0.2s ease;
}

.hub-loader-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.hub-spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--hub-border-medium);
  border-top-color: var(--hub-accent-current);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Modal Overlay & Card */
.hub-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.hub-modal-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.hub-modal {
  width: 90%;
  max-width: 580px;
  max-height: 85vh;
  background-color: var(--hub-bg-card);
  border: 1px solid var(--hub-border-medium);
  border-radius: var(--hub-radius-lg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
}

.hub-modal-header {
  padding: 1.25rem;
  border-bottom: 1px solid var(--hub-border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.hub-modal-body {
  padding: 1.25rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.hub-modal-footer {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--hub-border-subtle);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.75rem;
}

.hub-form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.hub-form-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--hub-text-secondary);
}

.hub-input, .hub-textarea {
  width: 100%;
  background-color: var(--hub-bg-canvas);
  border: 1px solid var(--hub-border-medium);
  border-radius: var(--hub-radius-sm);
  padding: 0.6rem 0.75rem;
  color: var(--hub-text-primary);
  font-family: var(--hub-font-sans);
  font-size: 0.875rem;
}

.hub-input:focus, .hub-textarea:focus {
  outline: none;
  border-color: var(--hub-accent-current);
}

.hub-textarea {
  min-height: 90px;
  resize: vertical;
}

.hub-btn {
  padding: 0.5rem 1rem;
  border-radius: var(--hub-radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.15s ease;
}

.hub-btn-primary {
  background-color: var(--hub-accent-current);
  color: #ffffff;
}

.hub-btn-primary:hover {
  opacity: 0.9;
}

.hub-btn-secondary {
  background-color: var(--hub-bg-active);
  color: var(--hub-text-secondary);
}

.hub-btn-secondary:hover {
  background-color: var(--hub-bg-card-hover);
  color: var(--hub-text-primary);
}