/* ===================================
   navigation.css — Tech Navigation Styles
   =================================== */

/* Page layout */
.nav-layout {
  display: flex;
  gap: var(--space-8);
  align-items: flex-start;
}

.nav-sidebar {
  width: 280px;
  position: sticky;
  top: 100px;
  flex-shrink: 0;
  z-index: 10;
}

.nav-sidebar__card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
  max-height: calc(100vh - 140px);
  overflow-y: auto;
}

.nav-sidebar__title {
  font-size: var(--text-xs);
  font-weight: var(--font-bold);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border);
}

.nav-sidebar__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.nav-sidebar__item a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast) ease;
  cursor: pointer;
}

.nav-sidebar__item a:hover {
  background: var(--color-bg-secondary);
  color: var(--color-accent);
}

.nav-sidebar__item.active a {
  background: var(--color-bg-secondary);
  color: var(--color-accent);
  font-weight: var(--font-bold);
  border-left: 3px solid var(--color-accent);
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
}

.nav-sidebar__count {
  font-size: var(--text-xxs);
  color: var(--color-text-tertiary);
  background: var(--color-bg-secondary);
  padding: var(--space-0-5) var(--space-2);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  transition: all var(--transition-fast) ease;
}

.nav-sidebar__item.active .nav-sidebar__count {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.nav-content {
  flex: 1;
  min-width: 0;
}

/* Search Box styling */
.nav-search-container {
  max-width: 580px;
  margin: var(--space-8) auto 0 auto;
  width: 100%;
}

.nav-search-box {
  display: flex;
  align-items: center;
  background: var(--color-surface);
  border: 1.5px solid var(--color-border-strong);
  border-radius: var(--radius-full);
  padding: var(--space-3) var(--space-5);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.nav-search-box:focus-within {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}

.search-icon {
  margin-right: var(--space-3);
  color: var(--color-text-tertiary);
  font-size: var(--text-lg);
  user-select: none;
}

#nav-search-input {
  border: none;
  background: transparent;
  color: var(--color-text-primary);
  font-size: var(--text-base);
  width: 100%;
  outline: none;
  font-family: var(--font-sans);
}

#nav-search-input::placeholder {
  color: var(--color-text-tertiary);
  opacity: 0.8;
}

.search-clear-btn {
  border: none;
  background: var(--color-border);
  color: var(--color-text-secondary);
  cursor: pointer;
  width: 20px;
  height: 20px;
  font-size: var(--text-xxs);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast) ease;
  margin-left: var(--space-2);
}

.search-clear-btn:hover {
  background: var(--color-text-tertiary);
  color: var(--color-surface);
}

/* Category Sections */
.nav-section {
  margin-bottom: var(--space-12);
  scroll-margin-top: 100px;
  animation: fade-in 0.5s ease-out;
}

.nav-section__title {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: 2px solid var(--color-border-strong);
}

.nav-section__count-badge {
  font-size: var(--text-xs);
  font-weight: var(--font-normal);
  color: var(--color-text-secondary);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
}

/* Grids and Cards */
.nav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-4);
}

.nav-card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  text-decoration: none;
  transition: transform var(--transition-spring), border-color var(--transition-base), box-shadow var(--transition-base);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  height: 100%;
}

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

.nav-card__header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
}

.nav-card__icon {
  font-size: 20px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
}

.nav-card__name {
  font-size: var(--text-sm);
  font-weight: var(--font-bold);
  color: var(--color-text-primary);
  line-height: 1.3;
}

.nav-card__desc {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
  line-height: 1.5;
  flex-grow: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.nav-card__footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  font-size: var(--text-xxs);
  font-weight: var(--font-bold);
  color: var(--color-accent);
  opacity: 0.8;
  transition: opacity var(--transition-fast);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
}

.nav-card:hover .nav-card__footer {
  opacity: 1;
}

.nav-card__arrow {
  transition: transform var(--transition-base);
  margin-left: 4px;
  display: inline-block;
}

.nav-card:hover .nav-card__arrow {
  transform: translateX(3px);
}

/* Category grid highlight border animation on active link */
.nav-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-hover));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base) ease;
}

.nav-card:hover::after {
  transform: scaleX(1);
}

/* Animations */
@keyframes fade-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Responsive Rules */
@media (max-width: 1150px) {
  .nav-layout {
    flex-direction: column;
    gap: var(--space-4);
  }

  .nav-sidebar {
    width: 100%;
    position: sticky;
    top: 70px; /* Sync with layout navbar height */
    z-index: 100;
  }

  .nav-sidebar__card {
    padding: var(--space-3);
    max-height: none;
    overflow: visible;
  }

  .nav-sidebar__title {
    display: none; /* Hide categories title on mobile to save vertical space */
  }

  .nav-sidebar__list {
    flex-direction: row;
    overflow-x: auto;
    white-space: nowrap;
    padding-bottom: var(--space-1);
    gap: var(--space-2);
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none; /* Firefox */
  }

  .nav-sidebar__list::-webkit-scrollbar {
    display: none; /* Safari and Chrome */
  }

  .nav-sidebar__item {
    display: inline-block;
  }

  .nav-sidebar__item a {
    padding: var(--space-2) var(--space-4);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
  }

  .nav-sidebar__item.active a {
    border-left: 1px solid var(--color-accent);
    border-radius: var(--radius-full);
    border-width: 1px;
    background: var(--color-accent);
    color: #fff;
  }

  .nav-sidebar__item.active .nav-sidebar__count {
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
    border-color: transparent;
  }

  .nav-section {
    scroll-margin-top: 140px; /* Larger offset on mobile due to sticky category bar */
  }
}