/* ==========================================================================
   COMPONENTS DESIGN SYSTEM
   Navigation, Buttons, Cards, Badges, Modals, Timeline, Chatbot, Footer
   ========================================================================== */

/* ==========================================================================
   Header & Sticky Glassmorphism Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  height: var(--nav-height);
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 1000;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.site-header.scrolled {
  border-bottom-color: var(--border-glow-cyan);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* Brand Logo */
.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0.05em;
  font-size: 1.15rem;
  color: var(--text-primary);
  flex-shrink: 0;
}

.brand-logo-img {
  height: 44px;
  width: auto;
  object-fit: contain;
  transition: transform var(--transition-normal);
}

.brand-link:hover .brand-logo-img {
  transform: scale(1.05);
}

.brand-text-block {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.1;
}

.brand-tagline {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent-cyan);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* Desktop Navigation Menu */
.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 8px;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  font-size: 0.925rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
  cursor: pointer;
}

.nav-link:hover, .nav-item:hover > .nav-link {
  color: var(--text-primary);
  background-color: rgba(255, 255, 255, 0.05);
}

[data-theme="light"] .nav-link:hover, [data-theme="light"] .nav-item:hover > .nav-link {
  background-color: rgba(15, 23, 42, 0.05);
}

.nav-link.active {
  color: var(--accent-cyan);
  font-weight: 600;
  background-color: rgba(0, 217, 255, 0.08);
  border: 1px solid var(--border-glow-cyan);
}

/* Dropdown Menu */
.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 220px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 8px;
  list-style: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  z-index: 100;
}

.nav-item:hover .nav-dropdown,
.nav-item:focus-within .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(4px);
}

.dropdown-link {
  display: block;
  padding: 10px 14px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.dropdown-link:hover {
  color: var(--accent-cyan);
  background-color: rgba(0, 217, 255, 0.08);
  transform: translateX(4px);
}

.dropdown-link.active {
  color: var(--accent-cyan);
  font-weight: 600;
  background-color: rgba(0, 217, 255, 0.12);
}

.nav-arrow {
  width: 12px;
  height: 12px;
  transition: transform var(--transition-fast);
}

.nav-item:hover .nav-arrow {
  transform: rotate(180deg);
}

/* Nav Actions (Theme, Language, Mobile Toggle) */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.control-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 38px;
  padding: 0 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  color: var(--text-primary);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.control-btn:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  box-shadow: var(--shadow-cyan-glow);
}

.control-btn svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
}

/* Hamburger Toggle */
.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  padding: 8px;
  background: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: currentColor;
  margin: 5px 0;
  transition: all var(--transition-fast);
}

/* Mobile Drawer */
.mobile-nav-drawer {
  position: fixed;
  top: var(--nav-height);
  left: 0;
  width: 100%;
  height: calc(100vh - var(--nav-height));
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  padding: 24px;
  overflow-y: auto;
  transform: translateX(-100%);
  transition: transform var(--transition-smooth);
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

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

.mobile-nav-group-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 8px;
  padding-left: 8px;
}

.mobile-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 16px;
}

.mobile-nav-link {
  display: block;
  padding: 10px 14px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.mobile-nav-link:hover, .mobile-nav-link.active {
  color: var(--accent-cyan);
  background: rgba(0, 217, 255, 0.08);
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 26px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-cyber);
  color: #FFFFFF;
  box-shadow: 0 4px 16px rgba(0, 217, 255, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0, 217, 255, 0.45);
  color: #FFFFFF;
}

.btn-secondary {
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}

.btn-secondary:hover {
  border-color: var(--border-glow-cyan);
  color: var(--accent-cyan);
  transform: translateY(-2px);
  box-shadow: var(--shadow-cyan-glow);
}

.btn-outline {
  background: transparent;
  color: var(--accent-cyan);
  border-color: var(--border-glow-cyan);
}

.btn-outline:hover {
  background: rgba(0, 217, 255, 0.1);
  color: #FFFFFF;
  transform: translateY(-2px);
}

.btn-disabled, .btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: auto;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 15px 32px;
  font-size: 1.05rem;
}

/* ==========================================================================
   Badges, Tags, Pills
   ========================================================================== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  line-height: 1;
}

.badge-cyan {
  background: rgba(0, 217, 255, 0.12);
  color: var(--accent-cyan);
  border: 1px solid var(--border-glow-cyan);
}

.badge-purple {
  background: rgba(139, 92, 246, 0.12);
  color: var(--accent-purple);
  border: 1px solid var(--border-glow-purple);
}

.tech-tag {
  display: inline-block;
  padding: 4px 10px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.tech-tag:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* ==========================================================================
   Cards & Grids
   ========================================================================== */
.card-cyber {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.card-cyber::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-cyber);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.card-cyber:hover {
  transform: translateY(-5px);
  border-color: var(--border-glow-cyan);
  box-shadow: var(--shadow-cyan-glow);
}

.card-cyber:hover::before {
  opacity: 1;
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: rgba(0, 217, 255, 0.1);
  border: 1px solid var(--border-glow-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  margin-bottom: 20px;
  flex-shrink: 0;
}

/* ==========================================================================
   Vertical Timeline Component
   ========================================================================== */
.timeline {
  position: relative;
  max-width: 860px;
  margin: 0 auto;
  padding: 20px 0;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 20px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent-cyan) 0%, var(--accent-purple) 100%);
  opacity: 0.4;
}

.timeline-item {
  position: relative;
  padding-left: 56px;
  margin-bottom: 40px;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: 11px;
  top: 8px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 3px solid var(--accent-cyan);
  box-shadow: 0 0 12px var(--accent-cyan);
  z-index: 2;
  transition: transform var(--transition-fast);
}

.timeline-item:hover .timeline-dot {
  transform: scale(1.2);
  border-color: var(--accent-purple);
  box-shadow: 0 0 16px var(--accent-purple);
}

.timeline-content {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: border-color var(--transition-normal), transform var(--transition-normal);
}

.timeline-content:hover {
  border-color: var(--border-glow-cyan);
  transform: translateX(4px);
}

.timeline-period {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}

.timeline-role {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.timeline-org {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent-purple);
  margin-bottom: 12px;
}

.timeline-desc {
  font-size: 0.925rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   Modals
   ========================================================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), visibility var(--transition-fast);
}

.modal-overlay.open {
  opacity: 1;
  visibility: visible;
}

.modal-container {
  background: var(--bg-surface);
  border: 1px solid var(--border-glow-cyan);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
  border-radius: var(--radius-lg);
  max-width: 680px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  padding: 32px;
  position: relative;
  transform: translateY(20px);
  transition: transform var(--transition-normal);
}

.modal-overlay.open .modal-container {
  transform: translateY(0);
}

.modal-close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.modal-close-btn:hover {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  transform: rotate(90deg);
}

/* ==========================================================================
   Floating AI Chatbot Demo Widget
   ========================================================================== */
.chatbot-widget-btn {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: var(--gradient-cyber);
  border: 2px solid #FFFFFF;
  box-shadow: 0 8px 30px rgba(0, 217, 255, 0.45);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 1500;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.chatbot-widget-btn:hover {
  transform: scale(1.08) rotate(5deg);
  box-shadow: 0 12px 35px rgba(0, 217, 255, 0.65);
}

.chatbot-widget-btn svg {
  width: 28px;
  height: 28px;
  stroke: currentColor;
}

.chatbot-widget-panel {
  position: fixed;
  bottom: 100px;
  right: 28px;
  width: 380px;
  max-width: calc(100vw - 40px);
  height: 560px;
  max-height: calc(100vh - 130px);
  background: var(--bg-surface);
  border: 1px solid var(--border-glow-cyan);
  border-radius: var(--radius-lg);
  box-shadow: 0 16px 50px rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 1500;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px) scale(0.95);
  transition: all var(--transition-normal);
}

.chatbot-widget-panel.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.chatbot-header {
  padding: 16px 20px;
  background: var(--bg-surface-elevated);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.chatbot-header-info {
  display: flex;
  flex-direction: column;
}

.chatbot-header-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.chatbot-header-status {
  font-size: 0.725rem;
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  gap: 6px;
}

.chatbot-header-status::before {
  content: '';
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
}

.chatbot-header-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-fast);
}

.chatbot-header-close:hover {
  color: var(--text-primary);
}

.chatbot-messages {
  flex: 1;
  overflow-y: auto;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.chat-bubble {
  max-width: 85%;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  line-height: 1.5;
  animation: fadeInBubble 0.25s ease-out forwards;
}

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

.chat-bubble-bot {
  align-self: flex-start;
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  border-bottom-left-radius: 2px;
}

.chat-bubble-user {
  align-self: flex-end;
  background: var(--gradient-cyber);
  color: #FFFFFF;
  border-bottom-right-radius: 2px;
}

.chatbot-suggestions {
  padding: 10px 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  border-top: 1px solid var(--border-subtle);
  background: rgba(0, 0, 0, 0.15);
}

.chat-suggestion-chip {
  background: var(--bg-surface);
  border: 1px solid var(--border-glow-cyan);
  color: var(--accent-cyan);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 5px 10px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.chat-suggestion-chip:hover {
  background: var(--accent-cyan);
  color: #080D1B;
}

.chatbot-input-bar {
  padding: 12px 18px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-surface-elevated);
}

.chatbot-input {
  flex: 1;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  color: var(--text-primary);
  font-size: 0.88rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

.chatbot-input:focus {
  border-color: var(--accent-cyan);
}

.chatbot-send-btn {
  background: var(--accent-cyan);
  color: #080D1B;
  border: none;
  border-radius: var(--radius-sm);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.chatbot-send-btn:hover {
  background: #00B8D9;
}

.chatbot-disclaimer {
  padding: 6px 14px;
  text-align: center;
  font-size: 0.7rem;
  color: var(--text-muted);
  background: var(--bg-primary);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  padding: 64px 0 32px;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.footer-bio {
  font-size: 0.925rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 360px;
}

.footer-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link {
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--accent-cyan);
}

.social-links {
  display: flex;
  gap: 12px;
}

.social-link {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.social-link:hover {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
}

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 12px;
}

/* ==========================================================================
   Responsive Navigation & Layout Breakpoints
   ========================================================================== */
@media (max-width: 1024px) {
  .nav-menu {
    display: none;
  }
  .menu-toggle {
    display: block;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 640px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .chatbot-widget-panel {
    bottom: 0;
    right: 0;
    width: 100vw;
    height: 100vh;
    max-height: 100vh;
    border-radius: 0;
  }
  .section {
    padding: 60px 0;
  }
}