/* ============================================================
   BlogSphere - Navbar Stylesheet
   ============================================================
   File:     assets/css/navbar.css
   Purpose:  All navbar related styles including mobile drawer

   Table of Contents:
     1. Navbar Base (Fixed Header)
     2. Navbar Inner Layout
     3. Logo
     4. Desktop Menu Links
     5. Navbar Actions (Search, Theme, Subscribe)
     6. Mobile Hamburger Button
     7. Mobile Menu Drawer
     8. Search Overlay
     9. Navbar Spacer
    10. Navbar Scroll State
    11. Navbar Responsive
   ============================================================ */

/* ============================================================
   1. NAVBAR BASE (Fixed Header)
   ============================================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border-light);
  transition: all var(--transition-base);
  height: var(--header-height);
}

/* Scrolled state - adds shadow and slightly transparent bg */
.navbar.scrolled {
  background-color: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

/* ============================================================
   2. NAVBAR INNER LAYOUT
   ============================================================ */
.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  gap: var(--space-lg);
}

/* ============================================================
   3. LOGO
   ============================================================ */
.navbar-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

.navbar-logo:hover {
  opacity: 0.85;
}

.navbar-logo-img {
  height: 36px;
  width: auto;
  object-fit: contain;
}

/* Logo switching for dark mode */
.logo-dark {
  display: none;
}

[data-theme='dark'] .logo-light {
  display: none;
}

[data-theme='dark'] .logo-dark {
  display: block;
}

/* ============================================================
   4. DESKTOP MENU LINKS
   ============================================================ */
.navbar-menu {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  list-style: none;
  margin: 0;
  padding: 0;
}

.navbar-menu-item {
  position: relative;
}

.navbar-menu-link {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 1rem;
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
  white-space: nowrap;
}

.navbar-menu-link:hover {
  color: var(--color-text);
  background-color: var(--color-bg-secondary);
}

/* Active menu link */
.navbar-menu-item.active .navbar-menu-link {
  color: var(--color-text);
  font-weight: var(--weight-semibold);
}

/* Active link underline indicator */
.navbar-menu-item.active .navbar-menu-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 3px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
}

/* ============================================================
   5. NAVBAR ACTIONS (Search, Theme, Subscribe)
   ============================================================ */
.navbar-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
}

.navbar-action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  background-color: transparent;
  color: var(--color-text-secondary);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: var(--text-base);
}

.navbar-action-btn:hover {
  background-color: var(--color-bg-tertiary);
  color: var(--color-text);
}

/* Search Button */
.navbar-search-btn {
  font-size: var(--text-sm);
}

/* Theme Toggle */
.navbar-theme-toggle {
  position: relative;
  overflow: hidden;
}

.theme-icon-light,
.theme-icon-dark {
  transition: all var(--transition-base);
}

.theme-icon-dark {
  display: none;
}

[data-theme='dark'] .theme-icon-light {
  display: none;
}

[data-theme='dark'] .theme-icon-dark {
  display: inline;
}

/* Subscribe Button */
.btn-subscribe {
  padding: 0.6rem 1.25rem;
  font-size: var(--text-sm);
  border-radius: var(--radius-full);
}

/* ============================================================
   6. MOBILE HAMBURGER BUTTON
   ============================================================ */
.navbar-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
  z-index: calc(var(--z-fixed) + 10);
}

.navbar-hamburger:hover {
  background-color: var(--color-bg-tertiary);
}

.hamburger-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  transform-origin: center;
}

/* Hamburger to X animation */
.navbar-hamburger.active .hamburger-line:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.navbar-hamburger.active .hamburger-line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.navbar-hamburger.active .hamburger-line:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================================
   7. MOBILE MENU DRAWER
   ============================================================ */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: calc(var(--z-fixed) + 5);
  pointer-events: none;
}

.mobile-menu.open {
  pointer-events: auto;
}

/* Overlay Background */
.mobile-menu-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.mobile-menu.open .mobile-menu-overlay {
  opacity: 1;
}

/* Drawer Panel */
.mobile-menu-drawer {
  position: absolute;
  top: 0;
  right: 0;
  width: 320px;
  max-width: 85%;
  height: 100%;
  background-color: var(--color-bg);
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform var(--transition-slow);
  display: flex;
  flex-direction: column;
  box-shadow: -8px 0 30px rgba(0, 0, 0, 0.1);
}

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

/* Drawer Header */
.mobile-menu-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-border-light);
}

.mobile-menu-header .navbar-logo-img {
  height: 30px;
}

.mobile-menu-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  background-color: var(--color-bg-secondary);
  color: var(--color-text);
  border-radius: var(--radius-full);
  cursor: pointer;
  font-size: var(--text-base);
  transition: all var(--transition-fast);
}

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

/* Mobile Search */
.mobile-menu-search {
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-border-light);
}

.mobile-search-form {
  display: flex;
  align-items: center;
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-full);
  overflow: hidden;
  border: 1px solid var(--color-border-light);
}

.mobile-search-input {
  flex: 1;
  padding: 0.65rem 1rem;
  border: none;
  background: transparent;
  font-size: var(--text-sm);
  color: var(--color-text);
  outline: none;
}

.mobile-search-input::placeholder {
  color: var(--color-text-light);
}

.mobile-search-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: color var(--transition-fast);
}

.mobile-search-btn:hover {
  color: var(--color-primary);
}

/* Mobile Navigation Links */
.mobile-menu-nav {
  list-style: none;
  padding: var(--space-sm) 0;
  margin: 0;
}

.mobile-menu-item {
  border-bottom: 1px solid var(--color-border-light);
}

.mobile-menu-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.85rem var(--space-lg);
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.mobile-menu-link:hover {
  background-color: var(--color-bg-secondary);
  color: var(--color-primary);
}

.mobile-menu-item.active .mobile-menu-link {
  color: var(--color-primary);
  font-weight: var(--weight-semibold);
  background-color: rgba(108, 92, 231, 0.05);
  border-left: 3px solid var(--color-primary);
}

/* Mobile Categories */
.mobile-menu-categories {
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--color-border-light);
}

.mobile-menu-section-title {
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-sm);
}

.mobile-category-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.mobile-category-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.5rem 0.75rem;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.mobile-category-link:hover {
  background-color: var(--color-bg-secondary);
  color: var(--color-primary);
}

.mobile-cat-icon {
  font-size: var(--text-sm);
  color: var(--color-primary);
  width: 20px;
  text-align: center;
}

.mobile-cat-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.mobile-cat-count {
  margin-left: auto;
  font-size: var(--text-xs);
  color: var(--color-text-light);
  background-color: var(--color-bg-secondary);
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

/* Mobile Theme Toggle */
.mobile-menu-theme {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--color-border-light);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text);
}

.mobile-theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.toggle-track {
  display: block;
  width: 48px;
  height: 26px;
  background-color: var(--color-border);
  border-radius: var(--radius-full);
  position: relative;
  transition: background-color var(--transition-base);
}

[data-theme='dark'] .toggle-track {
  background-color: var(--color-primary);
}

.toggle-thumb {
  display: block;
  width: 22px;
  height: 22px;
  background-color: white;
  border-radius: 50%;
  position: absolute;
  top: 2px;
  left: 2px;
  transition: transform var(--transition-base);
  box-shadow: var(--shadow-sm);
}

[data-theme='dark'] .toggle-thumb {
  transform: translateX(22px);
}

/* Mobile Subscribe */
.mobile-menu-subscribe {
  padding: var(--space-md) var(--space-lg);
  margin-top: auto;
}

.mobile-menu-subscribe .btn {
  border-radius: var(--radius-full);
  padding: 0.75rem;
}

/* ============================================================
   8. SEARCH OVERLAY (Full-screen)
   ============================================================ */
.search-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: calc(var(--z-modal) + 10);
  background-color: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 15vh;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

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

.search-overlay-content {
  width: 100%;
  max-width: 680px;
  padding: 0 var(--space-lg);
  position: relative;
}

.search-overlay-close {
  position: fixed;
  top: 20px;
  right: 20px;
  width: 48px;
  height: 48px;
  border: none;
  background-color: var(--color-bg-secondary);
  color: var(--color-text);
  border-radius: 50%;
  cursor: pointer;
  font-size: var(--text-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.search-overlay-close:hover {
  background-color: var(--color-error-light);
  color: var(--color-error);
  transform: rotate(90deg);
}

.search-overlay-inner {
  transform: translateY(20px);
  transition: transform var(--transition-base);
}

.search-overlay.active .search-overlay-inner {
  transform: translateY(0);
}

.search-overlay-title {
  font-size: var(--text-2xl);
  font-weight: var(--weight-bold);
  margin-bottom: var(--space-lg);
  color: var(--color-text);
  text-align: center;
}

.search-overlay-form {
  margin-bottom: var(--space-xl);
}

.search-input-wrapper {
  display: flex;
  align-items: center;
  background-color: var(--color-bg-secondary);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 0.25rem;
  transition: all var(--transition-fast);
}

.search-input-wrapper:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(108, 92, 231, 0.1);
}

.search-input-icon {
  padding-left: var(--space-md);
  color: var(--color-text-muted);
  font-size: var(--text-base);
}

.search-overlay-input {
  flex: 1;
  padding: 0.85rem var(--space-md);
  border: none;
  background: transparent;
  font-size: var(--text-lg);
  color: var(--color-text);
  outline: none !important;
}

.search-overlay-input::placeholder {
  color: var(--color-text-light);
}

.search-overlay-submit {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--gradient-primary);
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: var(--text-sm);
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.search-overlay-submit:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-md);
}

/* Search Suggestions */
.search-suggestions {
  text-align: center;
}

.search-suggestion-label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.search-suggestion-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
}

.search-suggestion-tag {
  display: inline-flex;
  align-items: center;
  padding: 0.4rem 1rem;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.search-suggestion-tag:hover {
  background-color: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

/* Live Search Results */
.search-live-results {
  margin-top: var(--space-lg);
  max-height: 400px;
  overflow-y: auto;
}

.search-result-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: background-color var(--transition-fast);
  border-bottom: 1px solid var(--color-border-light);
}

.search-result-item:hover {
  background-color: var(--color-bg-secondary);
}

.search-result-img {
  width: 60px;
  height: 45px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  flex-shrink: 0;
  background-color: var(--color-bg-tertiary);
}

.search-result-info {
  flex: 1;
}

.search-result-title {
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-text);
  margin-bottom: 2px;
}

.search-result-meta {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.search-no-results {
  text-align: center;
  padding: var(--space-xl);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

/* ============================================================
   9. NAVBAR SPACER
   Prevents content from being hidden behind fixed navbar
   ============================================================ */
.navbar-spacer {
  height: var(--header-height);
}

/* ============================================================
   10. NAVBAR SCROLL STATE
   ============================================================ */
.navbar.hide-on-scroll {
  transform: translateY(-100%);
}

.navbar.show-on-scroll {
  transform: translateY(0);
}

/* ============================================================
   11. NAVBAR RESPONSIVE
   ============================================================ */

/* Tablet & Below: 1024px */
@media (max-width: 1024px) {
  .navbar-menu {
    display: none;
  }

  .btn-subscribe {
    display: none;
  }

  .navbar-hamburger {
    display: flex;
  }

  .mobile-menu {
    display: block;
  }
}

/* Mobile: 768px */
@media (max-width: 768px) {
  .navbar {
    height: 64px;
  }

  .navbar-inner {
    height: 64px;
  }

  .navbar-spacer {
    height: 64px;
  }

  .navbar-logo-img {
    height: 28px;
  }

  .mobile-menu-drawer {
    width: 300px;
  }

  .search-overlay {
    padding-top: 10vh;
  }

  .search-overlay-title {
    font-size: var(--text-xl);
  }

  .search-overlay-input {
    font-size: var(--text-base);
  }
}

/* Small Mobile: 480px */
@media (max-width: 480px) {
  .navbar {
    height: 58px;
  }

  .navbar-inner {
    height: 58px;
  }

  .navbar-spacer {
    height: 58px;
  }

  .navbar-logo-img {
    height: 24px;
  }

  .navbar-action-btn {
    width: 34px;
    height: 34px;
    font-size: var(--text-sm);
  }

  .mobile-menu-drawer {
    width: 280px;
    max-width: 90%;
  }

  .search-overlay-close {
    width: 40px;
    height: 40px;
    top: 12px;
    right: 12px;
  }

  .search-overlay-content {
    padding: 0 var(--space-md);
  }
}