/* ==========================================================================
   NexsoLabs UI Components
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Header & Navigation Bar
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  height: var(--header-height);
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: var(--z-nav);
  display: flex;
  align-items: center;
  transition: background-color var(--trans-base), border-color var(--trans-base);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.brand-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
}

.brand-logo {
  height: 48px;
  width: auto;
  overflow: visible;
  transition: transform var(--trans-fast);
}

@media (max-width: 480px) {
  .brand-logo {
    height: 44px;
  }
}

.brand-logo .wordmark-name {
  fill: var(--text-primary) !important;
  font-weight: 800;
  transition: fill var(--trans-base);
}

[data-theme="light"] .brand-logo .wordmark-name {
  fill: #0F172A !important;
}

[data-theme="dark"] .brand-logo .wordmark-name {
  fill: #F8FAFC !important;
}

.brand-logo .wordmark-sub {
  fill: var(--text-secondary) !important;
  font-weight: 600;
  transition: fill var(--trans-base);
}

.brand-logo .logo-hex {
  transition: fill var(--trans-base);
}

[data-theme="light"] .brand-logo .logo-hex {
  fill: #E2E8F0 !important;
}

[data-theme="dark"] .brand-logo .logo-hex {
  fill: #0B0F19 !important;
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: var(--space-xs) 0;
  transition: color var(--trans-fast);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--text-primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--grad-primary);
  transition: width var(--trans-base);
  border-radius: var(--radius-full);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* --------------------------------------------------------------------------
   2. Language Picker Dropdown (Compact Horizontal Footprint)
   -------------------------------------------------------------------------- */
.lang-dropdown {
  position: relative;
  display: inline-block;
}

.lang-dropdown-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  height: 38px;
  padding: 0 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  color: var(--text-primary);
  font-size: 0.825rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: all var(--trans-fast);
  line-height: 1;
  user-select: none;
}

.lang-dropdown-btn:hover {
  border-color: var(--border-medium);
  background: var(--bg-tertiary);
}

.lang-dropdown-btn:focus-visible {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--border-glow);
}

.lang-dropdown.open .lang-dropdown-btn,
.lang-dropdown-btn[aria-expanded="true"] {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.25);
  background: var(--bg-tertiary);
}

.lang-dropdown-btn .lang-globe-icon {
  color: var(--text-secondary);
  flex-shrink: 0;
  transition: color var(--trans-fast);
}

.lang-dropdown-btn:hover .lang-globe-icon,
.lang-dropdown.open .lang-dropdown-btn .lang-globe-icon {
  color: var(--accent-cyan);
}

.lang-dropdown-btn .lang-current {
  font-family: var(--font-sans);
  text-transform: uppercase;
}

.lang-dropdown-btn .lang-chevron-icon {
  color: var(--text-muted);
  flex-shrink: 0;
  transition: transform var(--trans-fast), color var(--trans-fast);
}

.lang-dropdown.open .lang-dropdown-btn .lang-chevron-icon {
  transform: rotate(180deg);
  color: var(--accent-cyan);
}

.lang-dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 165px;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg), 0 10px 30px rgba(0, 0, 0, 0.4);
  padding: 6px;
  margin: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 3px;
  z-index: 70;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px) scale(0.96);
  transform-origin: top right;
  transition: opacity var(--trans-fast), transform var(--trans-fast), visibility var(--trans-fast);
  pointer-events: none;
}

.lang-dropdown.open .lang-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.lang-dropdown-item {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--trans-fast), color var(--trans-fast);
  user-select: none;
}

.lang-dropdown-item:hover,
.lang-dropdown-item:focus-visible {
  outline: none;
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.lang-dropdown-item .lang-code {
  font-size: 0.725rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
  min-width: 26px;
  text-align: center;
  transition: all var(--trans-fast);
}

[data-theme="light"] .lang-dropdown-item .lang-code {
  background: rgba(0, 0, 0, 0.06);
  color: var(--text-secondary);
}

.lang-dropdown-item:hover .lang-code {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.15);
}

[data-theme="light"] .lang-dropdown-item:hover .lang-code {
  background: rgba(0, 0, 0, 0.1);
}

.lang-dropdown-item .lang-name {
  flex: 1;
  text-align: left;
}

.lang-dropdown-item .lang-check-icon {
  opacity: 0;
  color: var(--accent-cyan);
  transition: opacity var(--trans-fast), transform var(--trans-fast);
  transform: scale(0.7);
  flex-shrink: 0;
}

.lang-dropdown-item.active {
  background: rgba(56, 189, 248, 0.12);
  color: var(--text-primary);
  font-weight: 600;
}

[data-theme="light"] .lang-dropdown-item.active {
  background: rgba(2, 132, 199, 0.1);
}

.lang-dropdown-item.active .lang-code {
  background: var(--grad-primary);
  color: #FFFFFF;
}

.lang-dropdown-item.active .lang-check-icon {
  opacity: 1;
  transform: scale(1);
}

/* Backward compatibility for legacy button group */
.lang-selector {
  display: flex;
  align-items: center;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 3px;
  gap: 2px;
}

.lang-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 8px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--trans-fast);
  line-height: 1;
}

.lang-btn:hover {
  color: var(--text-primary);
}

.lang-btn.active {
  background: var(--grad-primary);
  color: #FFFFFF;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.35);
}

/* --------------------------------------------------------------------------
   3. Theme Switcher (Dark / Light)
   -------------------------------------------------------------------------- */
.theme-toggle-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--trans-fast);
}

.theme-toggle-btn:hover {
  border-color: var(--border-focus);
  box-shadow: var(--shadow-glow);
}

.theme-icon {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
}

.sun-icon { display: none; }
.moon-icon { display: block; }

[data-theme="light"] .sun-icon { display: block; }
[data-theme="light"] .moon-icon { display: none; }

/* --------------------------------------------------------------------------
   4. Action Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--trans-base);
  line-height: 1.2;
  min-height: 46px;
}

.btn-primary {
  background: var(--grad-primary);
  color: #FFFFFF !important;
  font-weight: 700;
  letter-spacing: 0.3px;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
  background: var(--grad-primary-hover);
  color: #FFFFFF !important;
  box-shadow: 0 6px 28px rgba(99, 102, 241, 0.6);
  transform: translateY(-2px);
}

[data-theme="light"] .btn-primary {
  color: #FFFFFF !important;
  text-shadow: 0 1px 3px rgba(15, 23, 42, 0.45);
  box-shadow: 0 4px 16px rgba(29, 78, 216, 0.35);
}

[data-theme="light"] .btn-primary:hover {
  color: #FFFFFF !important;
  box-shadow: 0 6px 24px rgba(29, 78, 216, 0.5);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-medium);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
}

.btn-outline:hover {
  border-color: var(--border-focus);
  background: rgba(56, 189, 248, 0.08);
  color: var(--accent-cyan);
}

/* --------------------------------------------------------------------------
   5. Badges & Tags
   -------------------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.badge-glow {
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: var(--accent-cyan);
}

[data-theme="light"] .badge-glow {
  background: rgba(2, 132, 199, 0.09);
  border: 1px solid rgba(2, 132, 199, 0.32);
  color: #075985;
  font-weight: 700;
  box-shadow: 0 2px 8px rgba(2, 132, 199, 0.08);
}

.badge-pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--accent-emerald);
  box-shadow: 0 0 10px var(--accent-emerald);
}

[data-theme="light"] .badge-pulse-dot {
  background-color: #059669;
  box-shadow: 0 0 6px rgba(5, 150, 105, 0.6);
}

.tech-tag {
  display: inline-flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  transition: all var(--trans-fast);
}

.tech-tag:hover {
  border-color: var(--border-focus);
  color: var(--text-primary);
}

/* --------------------------------------------------------------------------
   6. Glassmorphism Interactive Cards
   -------------------------------------------------------------------------- */
.card-glass {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: clamp(1.5rem, 3vw, 2.25rem);
  box-shadow: var(--shadow-sm);
  transition: transform var(--trans-smooth), border-color var(--trans-smooth), box-shadow var(--trans-smooth);
  position: relative;
  overflow: hidden;
}

.card-glass::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--grad-surface);
}

.card-glass:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-md), var(--shadow-glow);
}

/* --------------------------------------------------------------------------
   7. Section Headers
   -------------------------------------------------------------------------- */
.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto var(--space-3xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.section-tag {
  color: var(--accent-cyan);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.section-title {
  color: var(--text-primary);
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.15rem;
}

/* --------------------------------------------------------------------------
   8. Filterable Tabs (Tech Radar)
   -------------------------------------------------------------------------- */
.tabs-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
}

.tab-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--trans-fast);
}

.tab-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.tab-btn.active {
  background: var(--grad-primary);
  color: #FFFFFF;
  border-color: transparent;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.tab-pane {
  display: none !important;
  animation: fadeIn 0.3s ease-in-out;
}

.tab-pane.active {
  display: grid !important;
}

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

/* --------------------------------------------------------------------------
   9. Forms & Form Controls
   -------------------------------------------------------------------------- */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-bottom: var(--space-lg);
  text-align: left;
}

.form-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: border-color var(--trans-fast), box-shadow var(--trans-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-status {
  padding: var(--space-md);
  border-radius: var(--radius-md);
  margin-top: var(--space-md);
  display: none;
  font-size: 0.95rem;
  font-weight: 500;
}

.form-status.success {
  display: block;
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid var(--accent-emerald);
  color: #34D399;
}

.form-status.error {
  display: block;
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid #EF4444;
  color: #F87171;
}

/* --------------------------------------------------------------------------
   10. Mobile Menu Drawer
   -------------------------------------------------------------------------- */
.menu-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
  color: var(--text-primary);
}

.mobile-drawer {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-primary);
  padding: var(--space-xl) var(--space-lg);
  flex-direction: column;
  gap: var(--space-lg);
  border-top: 1px solid var(--border-subtle);
  z-index: var(--z-drawer);
  overflow-y: auto;
}

.mobile-drawer.open {
  display: flex;
}

.mobile-nav-link {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--border-subtle);
}

.mobile-nav-link:hover {
  color: var(--text-primary);
}

.mobile-drawer .btn-primary {
  color: #FFFFFF !important;
  border-bottom: none !important;
  text-decoration: none !important;
  width: 100%;
  font-size: 1.05rem;
  font-weight: 700;
  text-align: center;
  justify-content: center;
}