/* ==========================================================================
   LAYOUT STRUCTURE (Sidebar, Navbar, Responsive Container)
   ========================================================================== */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  min-height: 100vh;
  overflow-x: hidden;
  transition: var(--transition-fast);
}

.app-wrapper {
  display: flex;
  min-height: 100vh;
}

/* Sidebar Styles */
.app-sidebar {
  width: var(--sidebar-width);
  background-color: var(--sidebar-bg-custom, var(--bg-secondary));
  border-right: 1px solid var(--border-color);
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 100;
  display: flex;
  flex-direction: column;
  transition: var(--transition-fast);
}

.sidebar-header {
  height: var(--header-height);
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 700;
  font-size: 1rem;
}

.brand-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-hover));
  color: #fff;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.9rem;
  box-shadow: 0 4px 12px var(--accent-light);
}

.sidebar-menu {
  flex: 1;
  padding: 1rem 0.6rem;
  overflow-y: auto;
}

.menu-header {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-subtle);
  padding: 0.6rem 0.6rem 0.25rem 0.6rem;
  text-transform: uppercase;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.55rem 0.8rem;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.83rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  margin-bottom: 0.2rem;
  transition: var(--transition-fast);
}

.nav-link i {
  font-size: 0.95rem;
  width: 18px;
  text-align: center;
}

.nav-link:hover {
  background-color: var(--bg-hover);
  color: var(--text-main);
}

.nav-link.active {
  background-color: var(--accent-light);
  color: var(--accent-primary);
  border-left: 3px solid var(--accent-primary);
}

.nav-link-badge {
  margin-left: auto;
  font-size: 0.68rem;
  padding: 0.1rem 0.45rem;
  border-radius: 20px;
  font-weight: 600;
}

.sidebar-sub-menu.show {
  display: flex !important;
}

.dropdown-arrow.rotate {
  transform: rotate(180deg);
}

/* Main Content Wrapper */
.main-wrapper {
  margin-left: var(--sidebar-width);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  transition: var(--transition-fast);
}

/* ==========================================================================
   COLLAPSED ICONS-ONLY SIDEBAR MODE
   ========================================================================== */
body.sidebar-collapsed .app-sidebar {
  width: var(--sidebar-collapsed); /* 80px */
}

body.sidebar-collapsed .main-wrapper {
  margin-left: var(--sidebar-collapsed); /* 80px */
}

body.sidebar-collapsed .brand-logo span,
body.sidebar-collapsed .menu-header,
body.sidebar-collapsed .nav-link span,
body.sidebar-collapsed .nav-link-badge {
  display: none !important;
}

body.sidebar-collapsed .sidebar-header {
  justify-content: center;
  padding: 0;
}

body.sidebar-collapsed .nav-link {
  justify-content: center;
  padding: 0.85rem 0;
  gap: 0;
  font-size: 1.15rem;
}

body.sidebar-collapsed .nav-link.active {
  border-left: none;
  border-bottom: 3px solid var(--accent-primary);
}

/* Header Navbar */
.app-navbar {
  height: var(--header-height);
  background-color: var(--header-bg, var(--bg-secondary));
  border-bottom: 1px solid var(--border-color);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 90;
}

.navbar-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.sidebar-toggle-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.sidebar-toggle-btn:hover {
  background-color: var(--bg-hover);
  color: var(--text-main);
}

.navbar-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Navbar Icon Button (Theme Toggle) */
.navbar-icon-btn {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 0.95rem;
  transition: var(--transition-fast);
}

.navbar-icon-btn:hover {
  background-color: var(--bg-hover);
  color: var(--accent-primary);
  border-color: var(--accent-primary);
}

[data-theme="light"] .navbar-icon-btn .icon-moon { display: inline-block; }
[data-theme="light"] .navbar-icon-btn .icon-sun { display: none; }
[data-theme="dark"] .navbar-icon-btn .icon-sun { display: inline-block; color: #f59e0b; }
[data-theme="dark"] .navbar-icon-btn .icon-moon { display: none; }

/* User Profile Dropdown Menu */
.user-dropdown-wrapper {
  position: relative;
}

.user-dropdown-btn {
  background: none;
  border: none;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  cursor: pointer;
  padding: 0.35rem 0.6rem;
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
  color: var(--text-main);
}

.user-dropdown-btn:hover {
  background-color: var(--bg-hover);
}

.user-avatar-circle {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent-light);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
}

.user-name-text {
  font-size: 0.85rem;
  font-weight: 600;
}

.dropdown-arrow {
  font-size: 0.7rem;
  color: var(--text-subtle);
  transition: var(--transition-fast);
}

.user-dropdown-menu {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  width: 170px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
  padding: 0.4rem 0;
  display: none;
  flex-direction: column;
  z-index: 1000;
}

.user-dropdown-menu.show {
  display: flex;
  animation: dropdownFade 0.2s ease-out;
}

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

.dropdown-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.55rem 1rem;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.83rem;
  font-weight: 500;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  cursor: pointer;
  transition: var(--transition-fast);
}

.dropdown-item:hover {
  background-color: var(--bg-hover);
  color: var(--text-main);
}

.dropdown-item.text-danger:hover {
  color: var(--color-danger);
  background-color: var(--bg-danger-light);
}

.dropdown-divider {
  height: 1px;
  background-color: var(--border-color);
  margin: 0.35rem 0;
}

.page-content {
  padding: 2rem;
  flex: 1;
}

.page-header {
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-title {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-main);
}

.page-subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* App Footer */
.app-footer {
  padding: 1.25rem 2rem;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Glass Header Navbar Upgrade */
.app-navbar {
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background-color: var(--header-bg, var(--glass-bg));
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

/* Segmented Navigation Tabs for Settings & Pages */
.segmented-tabs {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background-color: var(--bg-hover);
  padding: 0.35rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  margin-bottom: 1.75rem;
}

.tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  background: none;
  border: none;
  cursor: pointer;
  transition: var(--transition-fast);
}

.tab-btn:hover {
  color: var(--text-main);
}

.tab-btn.active {
  background-color: var(--bg-card);
  color: var(--accent-primary);
  box-shadow: var(--shadow-sm);
}

/* iOS Style Animated Toggle Switches */
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 46px;
  height: 26px;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--border-light);
  transition: var(--transition-fast);
  border-radius: 34px;
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: var(--transition-fast);
  border-radius: 50%;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.toggle-switch input:checked + .toggle-slider {
  background-color: var(--accent-primary);
  box-shadow: 0 0 10px var(--accent-glow);
}

.toggle-switch input:checked + .toggle-slider:before {
  transform: translateX(20px);
}

/* Vertical Left Navigation Tabs */
.vertical-tabs-container {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 1.5rem;
  align-items: start;
}

.vertical-tabs-nav {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 0.6rem;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: calc(var(--header-height) + 1.5rem);
}

.tab-btn-v {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  width: 100%;
  transition: var(--transition-fast);
}

.tab-btn-v i {
  font-size: 0.95rem;
  width: 20px;
  text-align: center;
}

.tab-btn-v:hover {
  background-color: var(--bg-hover);
  color: var(--text-main);
}

.tab-btn-v.active {
  background-color: var(--accent-light);
  color: var(--accent-primary);
  border-left: 3px solid var(--accent-primary);
}

/* Light & Dark Logo Theme Toggle Rules */
[data-theme="dark"] .logo-light { display: none !important; }
[data-theme="dark"] .logo-dark { display: inline-block !important; }
[data-theme="light"] .logo-light { display: inline-block !important; }
[data-theme="light"] .logo-dark { display: none !important; }

/* Sidebar Expanded vs Collapsed Logo/Favicon Toggling */
.logo-expanded-view {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.logo-collapsed-favicon {
  display: none;
  align-items: center;
  justify-content: center;
}

body.sidebar-collapsed .logo-expanded-view {
  display: none !important;
}

body.sidebar-collapsed .logo-collapsed-favicon {
  display: flex !important;
}

/* 3-Column Settings Grid (Left Nav + Center Form + Right Live Preview) */
.settings-grid-3col {
  display: grid;
  grid-template-columns: 240px 1fr 340px;
  gap: 1.75rem;
  align-items: start;
  width: 100%;
}

/* Off-Canvas Backdrop Overlay for Mobile Sidebar */
.sidebar-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 95;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s cubic-bezier(0.4, 0, 0.2, 1), visibility 0.25s ease;
}

.sidebar-backdrop.show {
  opacity: 1;
  visibility: visible;
}

@media (max-width: 1280px) {
  .settings-grid-3col {
    grid-template-columns: 220px 1fr;
  }
  .preview-col-span {
    grid-column: 1 / -1;
  }
  .preview-card {
    position: static !important;
  }
}

@media (max-width: 992px) {
  .app-sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    width: 280px !important;
    z-index: 100;
    transform: translateX(-100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.25);
  }

  .app-sidebar.show {
    transform: translateX(0);
  }

  .main-wrapper {
    margin-left: 0 !important;
    width: 100% !important;
  }

  .app-navbar {
    padding: 0 1rem;
  }

  .page-content {
    padding: 1.25rem 1rem;
  }

  .user-name-text {
    display: none;
  }

  .user-dropdown-btn {
    padding: 0.25rem;
  }
}

@media (max-width: 768px) {
  .settings-grid-3col {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  /* Senior UI/UX Horizontal Scrollable Pill Bar for Mobile Settings */
  .vertical-tabs-nav {
    flex-direction: row;
    overflow-x: auto;
    white-space: nowrap;
    scrollbar-width: none;
    -ms-overflow-style: none;
    -webkit-overflow-scrolling: touch;
    padding: 0.4rem;
    gap: 0.4rem;
    position: sticky;
    top: var(--header-height);
    z-index: 85;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
  }

  .vertical-tabs-nav::-webkit-scrollbar {
    display: none;
  }

  .tab-btn-v {
    width: auto;
    white-space: nowrap;
    padding: 0.55rem 0.9rem;
    font-size: 0.8rem;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
  }

  .tab-btn-v.active {
    border-left: none;
    border-bottom: 2px solid var(--accent-primary);
  }

  /* Form controls & grid stacking on mobile */
  .form-group grid,
  div[style*="grid-template-columns: 1fr 1fr"] {
    grid-template-columns: 1fr !important;
  }

  .page-title {
    font-size: 1.35rem;
  }

  .app-footer {
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
    padding: 1rem;
  }
}