#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

#topnav {
  height: 56px;
  background: rgba(0, 0, 0, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 100;
  flex-shrink: 0;
}

.topnav-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.topnav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  text-decoration: none;
}

.topnav-logo {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  object-fit: contain;
}

.topnav-name {
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.35rem;
  font-weight: 700;
  background: linear-gradient(135deg, #ffffff 20%, var(--primary-light) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.5px;
}

.topnav-divider {
  width: 1px;
  height: 24px;
  background: var(--border-light);
}

.topnav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none; /* Firefox */
  -ms-overflow-style: none; /* IE/Edge */
}
.topnav-links::-webkit-scrollbar {
  display: none; /* WebKit */
}

.topnav-link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  background: none;
  font-family: inherit;
  white-space: nowrap;
  text-decoration: none;
}

.topnav-link:hover {
  color: var(--text);
  background: rgba(212, 168, 67, 0.04);
}

.topnav-link.active {
  color: var(--primary-light);
  background: rgba(212, 168, 67, 0.06);
}

.topnav-link i {
  font-size: 0.82rem;
  width: 16px;
  text-align: center;
}

.topnav-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.topnav-btn {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition);
  font-size: 0.85rem;
}

.topnav-btn:hover {
  color: var(--primary-light);
  border-color: var(--border-light);
}

.menu-toggle {
  display: none;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1rem;
}

#main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow: hidden;
}

#page-content {
  flex: 1;
  overflow-y: auto;
  padding: 28px 32px;
  background: var(--bg-primary);
}

.mobile-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  z-index: 990;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.mobile-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.mobile-menu {
  display: flex;
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 290px;
  height: 100vh;
  background: rgba(1, 4, 9, 0.94);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-left: 1px solid var(--glass-border);
  padding: 30px 20px 24px;
  z-index: 999;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.mobile-menu.open {
  transform: translateX(0);
}

.mobile-menu-header {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  margin-bottom: 24px;
}

.mobile-menu-close {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 1.4rem;
  cursor: pointer;
  padding: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all var(--transition);
}

.mobile-menu-close:hover {
  background: var(--glass-hover);
  color: var(--primary-light);
}

.mobile-menu-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mobile-menu .topnav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  text-align: left;
  border-radius: var(--radius-lg);
  transition: all var(--transition);
  cursor: pointer;
  width: 100%;
}

.mobile-menu .topnav-link i {
  font-size: 1rem;
  color: var(--text-muted);
  transition: color var(--transition);
  width: 20px;
  text-align: center;
}

.mobile-menu .topnav-link:hover,
.mobile-menu .topnav-link.active {
  background: var(--glass-hover);
  border-color: var(--glass-border);
  color: var(--primary-light);
}

.mobile-menu .topnav-link:hover i,
.mobile-menu .topnav-link.active i {
  color: var(--primary-light);
}

#toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 11px 18px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  font-size: 0.82rem;
  color: var(--text);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 10px;
  animation: slideInRight 0.3s ease;
  min-width: 240px;
}

.toast.success {
  border-left: 3px solid var(--success);
}
.toast.error {
  border-left: 3px solid var(--error);
}
.toast.info {
  border-left: 3px solid var(--primary);
}

@media (max-width: 1120px) {
  #topnav {
    padding: 0 16px;
  }
  .topnav-links {
    display: none;
  }
  .menu-toggle {
    display: flex;
  }
  #page-content {
    padding: 20px 16px;
  }
  .hide-mobile {
    display: none !important;
  }

  /* Dashboard hero grid */
  .dash-hero {
    grid-template-columns: 1fr !important;
  }
  .hero-side {
    grid-template-columns: 1fr 1fr !important;
  }

  /* Tools Vault search bar stacking */
  .search-container.glass-card {
    flex-direction: column !important;
    align-items: stretch !important;
  }
  .search-container.glass-card select {
    width: 100% !important;
  }
}

@media (max-width: 768px) {
  #page-content {
    padding: 16px 12px;
  }

  .grid-3 {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 16px !important;
  }
}

@media (max-width: 600px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr !important;
  }

  .search-container {
    flex-direction: column !important;
    align-items: stretch !important;
    gap: 12px !important;
    padding: 15px !important;
  }

  .search-container > div,
  .search-container select {
    width: 100% !important;
    max-width: none !important;
    flex: none !important;
  }

  /* Dashboard */
  .dash-hero {
    gap: 10px !important;
  }
  .hero-side {
    grid-template-columns: 1fr !important;
  }
  .hero-main {
    padding: 20px !important;
  }
  .hero-main p {
    max-width: 100% !important;
  }
  .hero-main .btn {
    font-size: 0.72rem !important;
    padding: 8px 16px !important;
  }
  .dash-title {
    font-size: 1.4rem !important;
  }
  .tgrid {
    grid-template-columns: 1fr !important;
  }

  /* Tabs: scrollable on mobile */
  .tabs,
  #tv-tabs {
    overflow-x: auto !important;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    flex-wrap: nowrap !important;
  }
  .tabs::-webkit-scrollbar,
  #tv-tabs::-webkit-scrollbar {
    display: none;
  }
  .tab-item {
    font-size: 0.72rem !important;
    padding: 6px 10px !important;
    white-space: nowrap !important;
  }

  /* Boilerplates */
  .glass-card pre {
    font-size: 11px !important;
  }

  /* Extension cards */
  .ext-card {
    padding: 16px !important;
  }
  .ext-install-btn {
    font-size: 0.7rem !important;
    padding: 5px 10px !important;
  }

  /* Tools grid */
  .tool-link-card {
    padding: 16px !important;
  }

  /* Page header */
  .page-header h1 {
    font-size: 1.25rem !important;
  }
  .page-header p {
    font-size: 0.8rem !important;
  }

  /* Flex-between stacking */
  .flex-between {
    flex-direction: column !important;
    gap: 10px !important;
    align-items: stretch !important;
  }
}

:root.light-mode #topnav {
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid var(--border);
}

:root.light-mode .topnav-name {
  background: linear-gradient(135deg, #000000 20%, var(--primary) 100%);
  -webkit-background-clip: text;
  background-clip: text;
}

:root.light-mode .mobile-menu {
  background: rgba(255, 255, 255, 0.96);
  border-left: 1px solid var(--border);
}