/* Nash.games App Shell */
.ng-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--ng-surface);
  border-bottom: 1px solid var(--ng-border);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
}

.ng-header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
  height: var(--ng-header-h);
  display: flex;
  align-items: center;
  gap: 20px;
}

.ng-brand {
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
  transition: opacity 0.15s ease;
}

.ng-brand:hover {
  opacity: 0.88;
}

.ng-brand-mark {
  display: block;
  height: 45px;
  width: auto;
  transition: filter 0.15s ease;
}

.ng-brand:hover .ng-brand-mark {
  filter: brightness(1.08);
}

.ng-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1;
}

.ng-nav-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 16px;
  border-radius: var(--ng-radius-sm);
  border: 1px solid transparent;
  color: var(--ng-text-muted);
  font-weight: 600;
  text-decoration: none;
  transition: background 0.15s, color 0.15s, border-color 0.15s, box-shadow 0.15s;
}

.ng-nav-link:hover {
  color: var(--ng-sky-bright);
  background: var(--ng-sky-dim);
  border-color: var(--ng-border);
}

.ng-nav-link.is-active {
  color: var(--ng-nav-active-text);
  background: var(--ng-nav-active-bg);
  border-color: rgba(255, 255, 255, 0.12);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.28);
}

.ng-nav-link.is-active i {
  opacity: 1;
}

.ng-header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

.ng-chat-header-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--ng-border);
  border-radius: var(--ng-radius-sm);
  background: var(--ng-surface-2);
  color: var(--ng-text-muted);
  font-size: 1.15rem;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s, box-shadow 0.15s;
}

.ng-chat-header-btn:hover {
  color: var(--ng-sky-bright);
  background: var(--ng-surface-elevated);
  border-color: rgba(184, 212, 240, 0.28);
}

.ng-chat-header-btn.is-active {
  color: #fff;
  background: var(--ng-nav-active-bg);
  border-color: rgba(255, 255, 255, 0.15);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.28);
}

.ng-user-menu { position: relative; }

.ng-user-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--ng-radius-sm);
  border: 1px solid var(--ng-border);
  background: var(--ng-surface-2);
  color: var(--ng-text);
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.ng-user-btn:hover,
.ng-user-btn[aria-expanded="true"] {
  background: var(--ng-surface-elevated);
  border-color: rgba(184, 212, 240, 0.28);
  color: var(--ng-sky-bright);
}

.ng-user-dropdown {
  position: absolute;
  right: 0;
  top: calc(100% + 6px);
  min-width: 160px;
  background: var(--ng-surface);
  border: 1px solid var(--ng-border);
  border-radius: var(--ng-radius-sm);
  box-shadow: var(--ng-shadow);
  padding: 6px;
  z-index: 200;
}

.ng-user-dropdown[hidden] { display: none; }

.ng-user-dropdown a {
  display: block;
  padding: 10px 12px;
  border-radius: 8px;
  color: var(--ng-text);
}

.ng-user-dropdown a:hover { background: var(--ng-sky-dim); }

.ng-nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--ng-border);
  border-radius: var(--ng-radius-sm);
  background: var(--ng-surface-2);
  color: var(--ng-text);
  font-size: 1.25rem;
  cursor: pointer;
}

.ng-main {
  flex: 1;
  width: 100%;
}

.ng-footer {
  margin-top: auto;
  background: var(--ng-surface);
  border-top: 1px solid var(--ng-border);
  padding: 24px 16px;
}

.ng-footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.ng-footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.ng-footer-links a {
  color: var(--ng-text-muted);
  font-size: 0.9rem;
  transition: color 0.15s;
}

.ng-footer-links a:hover {
  color: var(--ng-sky-bright);
}

.ng-footer-copy {
  margin: 0;
  font-size: 0.85rem;
  color: var(--ng-text-muted);
}

@media (max-width: 768px) {
  .ng-nav {
    display: none;
    position: absolute;
    top: var(--ng-header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--ng-surface);
    border-bottom: 1px solid var(--ng-border);
    padding: 12px 16px;
    box-shadow: var(--ng-shadow);
  }

  .ng-nav.is-open { display: flex; }

  .ng-nav-link { width: 100%; }

  .ng-nav-toggle { display: inline-flex; align-items: center; justify-content: center; }

  .ng-header-inner { position: relative; }
}