/**
 * CUSTOM BOTTOM SHEET NAVIGATION - BUILT FROM SCRATCH
 * Modern, fire navigation that replaces mkdocs sidebar
 */

/* ============================================
   FLOATING NAV BUTTON - MOBILE ONLY
   MATCHES CHATBOT BUTTON EXACTLY
   ============================================ */

.custom-nav-button {
  position: fixed;
  bottom: 100px; /* Positioned ABOVE chatbot button */
  right: 20px; /* Same horizontal position as chatbot */

  /* EXACT MATCH TO CHATBOT: Size, gradient, shadow, border radius */
  width: 60px;           /* ← Same as chatbot (60px) */
  height: 60px;          /* ← Same as chatbot (60px) */
  background: linear-gradient(135deg, #29B6F6 0%, #0288D1 100%); /* ← Same gradient as chatbot */
  border-radius: 50%;    /* ← Same border radius as chatbot */
  box-shadow: 0 4px 12px rgba(41, 182, 246, 0.4); /* ← Same shadow as chatbot */

  border: none;
  cursor: pointer;
  z-index: 1002; /* ABOVE overlay (1000) and sheet (1001) so button stays visible */
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1); /* ← Same transition as chatbot */
}

.custom-nav-button:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 20px rgba(41, 182, 246, 0.6); /* Match chatbot hover shadow */
}

.custom-nav-button:active {
  transform: scale(0.95);
}

/* Hamburger icon - EXACT MATCH to chatbot icon size */
.custom-nav-button svg {
  width: 32px;  /* ← Same as chatbot icon (32px) */
  height: 32px; /* ← Same as chatbot icon (32px) */
  fill: white;
}

/* DESKTOP: Hide nav button completely */
@media screen and (min-width: 76.25em) {
  .custom-nav-button {
    display: none !important;
  }
}

/* ============================================
   BACKDROP OVERLAY
   ============================================ */

.custom-nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.custom-nav-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* ============================================
   CUSTOM BOTTOM SHEET
   ============================================ */

.custom-bottom-sheet {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  height: 85vh;
  max-height: 85vh;
  background: var(--md-default-bg-color, #ffffff);
  border-top-left-radius: 24px;
  border-top-right-radius: 24px;
  box-shadow: 0 -8px 32px rgba(0, 0, 0, 0.2);
  z-index: 1001;

  /* Hidden by default - slides up from bottom */
  transform: translateY(100%);
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);

  /* Enable GPU acceleration */
  will-change: transform;
  backface-visibility: hidden;
}

.custom-bottom-sheet.active {
  transform: translateY(0);
}

/* ============================================
   DRAG HANDLE
   ============================================ */

.custom-sheet-handle {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: grab;
  background: var(--md-default-bg-color, #ffffff);
  border-top-left-radius: 24px;
  border-top-right-radius: 24px;
  z-index: 10;
}

.custom-sheet-handle:active {
  cursor: grabbing;
}

.custom-sheet-handle-bar {
  width: 40px;
  height: 4px;
  background: rgba(148, 163, 184, 0.4);
  border-radius: 2px;
  transition: background 0.2s ease;
}

.custom-sheet-handle:hover .custom-sheet-handle-bar {
  background: rgba(148, 163, 184, 0.6);
}

/* ============================================
   SHEET HEADER
   ============================================ */

.custom-sheet-header {
  padding: 0 1.5rem 1rem;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  background: var(--md-default-bg-color, #ffffff);
  position: sticky;
  top: 32px;
  z-index: 9;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.custom-sheet-header-content {
  flex: 1;
}

.custom-sheet-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--md-default-fg-color, #000);
  margin: 0;
}

.custom-sheet-subtitle {
  font-size: 0.9rem;
  color: var(--md-default-fg-color--light, #666);
  margin: 0.25rem 0 0;
}

/* Close button in header */
.custom-sheet-close {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: transparent;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  flex-shrink: 0;
  margin-left: 1rem;
}

.custom-sheet-close:hover {
  background: rgba(0, 0, 0, 0.05);
}

.custom-sheet-close:active {
  background: rgba(0, 0, 0, 0.1);
  transform: scale(0.95);
}

.custom-sheet-close svg {
  width: 24px;
  height: 24px;
  fill: var(--md-default-fg-color--light, #666);
}

/* ============================================
   SCROLLABLE CONTENT
   ============================================ */

.custom-sheet-content {
  height: calc(85vh - 32px - 80px); /* Total height - handle - header */
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  padding: 1.5rem;
}

/* Custom scrollbar */
.custom-sheet-content::-webkit-scrollbar {
  width: 6px;
}

.custom-sheet-content::-webkit-scrollbar-track {
  background: transparent;
}

.custom-sheet-content::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 184, 0.3);
  border-radius: 3px;
}

.custom-sheet-content::-webkit-scrollbar-thumb:hover {
  background: rgba(148, 163, 184, 0.5);
}

/* ============================================
   NAVIGATION ITEMS
   ============================================ */

.custom-nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.custom-nav-item {
  margin: 0.25rem 0;
}

.custom-nav-link {
  display: flex;
  align-items: center;
  padding: 0.9rem 1.2rem;
  min-height: 52px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--md-default-fg-color, #000);
  text-decoration: none;
  border-radius: 12px;
  transition: all 0.2s ease;
  position: relative;
}

.custom-nav-link:hover {
  background: rgba(102, 126, 234, 0.08);
  color: var(--md-accent-fg-color, #667eea);
}

.custom-nav-link:active {
  background: rgba(102, 126, 234, 0.15);
  transform: scale(0.98);
}

/* Active/current page */
.custom-nav-link.active {
  background: rgba(102, 126, 234, 0.12);
  color: var(--md-accent-fg-color, #667eea);
  font-weight: 600;
}

.custom-nav-link.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 60%;
  background: var(--md-accent-fg-color, #667eea);
  border-radius: 0 2px 2px 0;
}

/* Navigation icons */
.custom-nav-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  margin-right: 0.75rem;
  opacity: 0.7;
  font-size: 18px;
  line-height: 1;
  flex-shrink: 0;
  vertical-align: middle;
}

.custom-nav-link:hover .custom-nav-icon,
.custom-nav-link.active .custom-nav-icon {
  opacity: 1;
}

/* Navigation text */
.custom-nav-text {
  display: inline-flex;
  align-items: center;
  line-height: 1.5;
  flex: 1;
}

/* ============================================
   SECTION HEADERS
   ============================================ */

.custom-nav-section {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--md-default-fg-color--light, #666);
  padding: 1rem 1.2rem 0.5rem;
  margin-top: 1rem;
}

.custom-nav-section:first-child {
  margin-top: 0;
}

/* ============================================
   NESTED/EXPANDABLE ITEMS
   ============================================ */

.custom-nav-item.has-children {
  position: relative;
}

.custom-nav-toggle {
  position: absolute;
  right: 0.5rem;
  top: 50%;
  transform: translateY(-50%);
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.2s ease;
}

.custom-nav-toggle:hover {
  background: rgba(0, 0, 0, 0.05);
}

.custom-nav-toggle svg {
  width: 16px;
  height: 16px;
  transition: transform 0.2s ease;
}

.custom-nav-item.expanded .custom-nav-toggle svg {
  transform: rotate(180deg);
}

.custom-nav-children {
  display: none;
  padding-left: 1rem;
  margin-top: 0.25rem;
  background: rgba(0, 0, 0, 0.03);
  border-radius: 8px;
  padding: 0.5rem 0;
}

.custom-nav-item.expanded .custom-nav-children {
  display: block;
}

.custom-nav-children .custom-nav-link {
  font-size: 0.9rem;
  min-height: 44px;
  padding-left: 2rem;
}

/* ============================================
   DARK MODE
   ============================================ */

[data-md-color-scheme="slate"] .custom-bottom-sheet {
  background: #1e1e1e;
  box-shadow: 0 -8px 32px rgba(0, 0, 0, 0.5);
}

[data-md-color-scheme="slate"] .custom-sheet-handle {
  background: #1e1e1e;
}

[data-md-color-scheme="slate"] .custom-sheet-header {
  background: #1e1e1e;
  border-bottom-color: rgba(255, 255, 255, 0.08);
}

[data-md-color-scheme="slate"] .custom-nav-children {
  background: rgba(255, 255, 255, 0.05);
}

[data-md-color-scheme="slate"] .custom-sheet-close:hover {
  background: rgba(255, 255, 255, 0.08);
}

[data-md-color-scheme="slate"] .custom-sheet-close:active {
  background: rgba(255, 255, 255, 0.12);
}

/* ============================================
   DESKTOP: Hide bottom sheet completely
   ============================================ */

@media screen and (min-width: 76.25em) {
  /* Desktop uses normal mkdocs sidebar - hide bottom sheet */
  .custom-bottom-sheet,
  .custom-nav-overlay {
    display: none !important;
  }
}

/* ============================================
   MOBILE OPTIMIZATIONS
   ============================================ */

@media screen and (max-width: 768px) {
  .custom-bottom-sheet {
    height: 90vh;
    max-height: 90vh;
  }

  .custom-nav-button {
    bottom: 90px; /* Above chatbot on mobile (chatbot is at 16px) */
    right: 16px; /* Match chatbot position on mobile */
    width: 56px;  /* ← ALWAYS equal to chatbot on mobile (56px) */
    height: 56px; /* ← ALWAYS equal to chatbot on mobile (56px) */
  }
}