/* ==========================================================================
   WHATSNEXUS WEBSITE: PAGE LAYOUT & SECTIONS
   Integrates directly with themes/index.css (Sentinel Theme Governor)
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family-body);
  background-color: var(--bg-body);
  color: var(--text-primary);
  line-height: var(--line-height-normal);
  overflow-x: hidden;
  transition: var(--transition-theme);
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(76, 158, 95, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 65%, rgba(6, 182, 212, 0.05) 0%, transparent 40%);
  background-attachment: fixed;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-body);
}
::-webkit-scrollbar-thumb {
  background: var(--bg-surface-elevated);
  border: 2px solid var(--bg-body);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--brand-primary);
}

a {
  color: inherit;
  text-decoration: none;
}

img, svg {
  display: block;
  max-width: 100%;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  height: 76px;
  background: var(--bg-glass);
  backdrop-filter: var(--blur-medium);
  -webkit-backdrop-filter: var(--blur-medium);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition-theme);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 16px;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
  letter-spacing: var(--tracking-tight);
  flex-shrink: 0;
  white-space: nowrap;
}

.brand-logo {
  width: 36px;
  height: 36px;
  filter: drop-shadow(0 2px 8px var(--brand-primary-glow));
  transition: transform var(--transition-fast);
}

.brand-link:hover .brand-logo {
  transform: rotate(-8deg) scale(1.08);
}

.brand-name {
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--brand-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-badge {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--brand-primary-subtle);
  color: var(--brand-primary);
  border: 1px solid rgba(76, 158, 95, 0.3);
  margin-left: 2px;
  flex-shrink: 0;
}

.nav-wrapper {
  display: flex;
  align-items: center;
  min-width: 0;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 20px;
  list-style: none;
  white-space: nowrap;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: var(--font-weight-medium);
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
  padding: 6px 0;
}

.nav-link:hover {
  color: var(--brand-primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--brand-primary);
  border-radius: 2px;
  transition: width var(--transition-fast);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.mobile-nav-toggle {
  display: none;
}

/* Sentinel Tactile Micro-Interactions */
.btn-tactile {
  transition: transform var(--duration-instant) var(--ease-sentinel),
              box-shadow var(--duration-fast) var(--ease-sentinel),
              background var(--duration-fast) var(--ease-sentinel) !important;
  user-select: none;
}

.btn-tactile:active {
  transform: scale(0.96) !important;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.icon-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-focus);
  transform: translateY(-2px);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--brand-primary) 0%, #368547 100%);
  color: #ffffff !important;
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
  padding: 10px 18px;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 14px var(--brand-primary-glow);
  transition: all var(--transition-fast);
  border: 1px solid rgba(255, 255, 255, 0.15);
  white-space: nowrap;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(76, 158, 95, 0.6);
  background: linear-gradient(135deg, #53af69 0%, #3ca052 100%);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-surface);
  color: var(--text-primary);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
  padding: 10px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  border-color: var(--brand-primary);
  color: var(--brand-primary);
  transform: translateY(-2px);
  background: var(--bg-surface-elevated);
}

/* ==========================================================================
   Hero Section & Live Interactive Mockup
   ========================================================================== */

.hero-section {
  padding: 80px 0 100px;
  position: relative;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: var(--brand-primary-subtle);
  color: var(--brand-primary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  border: 1px solid rgba(76, 158, 95, 0.35);
  margin-bottom: 24px;
  animation: pulse-glow 3s infinite ease-in-out;
}

.hero-title {
  font-size: var(--font-size-hero);
  font-weight: var(--font-weight-extrabold);
  line-height: var(--line-height-tight);
  letter-spacing: var(--tracking-tight);
  margin-bottom: 24px;
  max-width: 950px;
  margin-left: auto;
  margin-right: auto;
}

.highlight-gradient {
  background: linear-gradient(135deg, var(--brand-primary) 0%, #10b981 50%, #06b6d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 780px;
  margin: 0 auto 36px;
  font-weight: var(--font-weight-regular);
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.hero-meta-info {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin-bottom: 60px;
}

/* ==========================================================================
   Interactive Electron App Mockup
   ========================================================================== */

.mockup-wrapper {
  max-width: 1040px;
  margin: 0 auto;
}

.app-mockup {
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-xl), 0 0 40px var(--mockup-primary-glow);
  overflow: hidden;
  text-align: left;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.mockup-titlebar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--bg-body);
  border-bottom: 1px solid var(--border-color);
}

.window-controls {
  display: flex;
  gap: 8px;
}

.control-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}
.dot-close { background: #ff5f56; }
.dot-min { background: #ffbd2e; }
.dot-max { background: #27c93f; }

.mockup-title {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.mockup-title-status {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.72rem;
  color: var(--mockup-primary);
  background: var(--mockup-primary-subtle);
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.mockup-body {
  display: flex;
  height: 480px;
  background: var(--bg-surface);
}

.accounts-sidebar {
  width: 76px;
  background: var(--bg-body-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px 0;
  gap: 16px;
  flex-shrink: 0;
}

.account-tab {
  position: relative;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  background: var(--bg-surface-elevated);
  border: 2px solid transparent;
  color: var(--text-secondary);
}

.account-tab:hover {
  transform: scale(1.08);
  border-color: var(--mockup-primary);
  color: var(--text-primary);
}

.account-tab.active {
  border-color: var(--mockup-primary);
  color: var(--mockup-primary);
  background: var(--mockup-primary-subtle);
  box-shadow: 0 0 16px var(--mockup-primary-glow);
}

.account-tab.active::before {
  content: '';
  position: absolute;
  left: -14px;
  width: 4px;
  height: 24px;
  background: var(--mockup-primary);
  border-radius: 0 4px 4px 0;
}

.unread-badge {
  position: absolute;
  top: -2px;
  right: -2px;
  background: #ef4444;
  color: #fff;
  font-size: 0.65rem;
  font-weight: var(--font-weight-bold);
  padding: 1px 5px;
  border-radius: var(--radius-full);
  border: 2px solid var(--bg-body-secondary);
}

.hibernation-icon {
  position: absolute;
  bottom: -2px;
  right: -2px;
  background: #3b82f6;
  color: #fff;
  font-size: 0.6rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--bg-body-secondary);
}

.add-account-btn {
  margin-top: auto;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px dashed var(--border-color);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.add-account-btn:hover {
  border-color: var(--mockup-primary);
  color: var(--mockup-primary);
  background: var(--mockup-primary-subtle);
}

.mockup-chats-list {
  width: 240px;
  border-right: 1px solid var(--border-color);
  background: var(--bg-surface);
  display: flex;
  flex-direction: column;
}

.chats-header {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.chats-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
}

.chat-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.chat-item:hover, .chat-item.active {
  background: var(--bg-surface-elevated);
}

.chat-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--mockup-primary-subtle);
  color: var(--mockup-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  flex-shrink: 0;
}

.chat-meta {
  flex: 1;
  min-width: 0;
}

.chat-name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chat-preview {
  font-size: 0.72rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mockup-chat-view {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg-body);
  position: relative;
}

.mockup-view-header {
  padding: 12px 20px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-active-account {
  display: flex;
  align-items: center;
  gap: 10px;
}

.header-acc-badge {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  padding: 2px 8px;
  border-radius: var(--radius-xs);
  background: var(--mockup-primary);
  color: #fff;
}

.header-acc-details h4 {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
}

.header-acc-details p {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.mockup-chat-messages {
  flex: 1;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  overflow-y: auto;
}

.chat-bubble {
  max-width: 75%;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-snug);
  position: relative;
}

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

.bubble-out {
  align-self: flex-end;
  background: var(--mockup-primary);
  color: #ffffff;
  border-bottom-right-radius: 2px;
  box-shadow: 0 4px 14px var(--mockup-primary-glow);
}

.bubble-time {
  font-size: 0.65rem;
  opacity: 0.75;
  margin-top: 4px;
  text-align: right;
}

.mockup-hibernation-banner {
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-size: var(--font-size-sm);
  color: #60a5fa;
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 10px 24px 0;
}

/* ==========================================================================
   Stats & Features Sections
   ========================================================================== */

.stats-section {
  padding: 40px 0 80px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.stat-card {
  background: var(--bg-card);
  backdrop-filter: var(--blur-medium);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-align: center;
  transition: all var(--transition-normal);
}

.stat-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-focus);
  box-shadow: var(--shadow-md);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: var(--font-weight-extrabold);
  color: var(--brand-primary);
  line-height: 1;
  margin-bottom: 8px;
  letter-spacing: var(--tracking-tight);
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  font-weight: var(--font-weight-medium);
}

.section-padding {
  padding: 100px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 60px;
}

.section-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  letter-spacing: var(--tracking-tight);
  margin-bottom: 16px;
  line-height: var(--line-height-snug);
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: var(--line-height-normal);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: var(--brand-primary-subtle);
  color: var(--brand-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 20px;
  border: 1px solid rgba(76, 158, 95, 0.25);
  transition: transform var(--transition-fast);
}

.sentinel-card:hover .feature-icon-box {
  transform: scale(1.1) rotate(5deg);
  background: var(--brand-primary);
  color: #fff;
  box-shadow: 0 0 20px var(--brand-primary-glow);
}

/* ==========================================================================
   Diagnostic Bug Report CTA in Feature Card
   ========================================================================== */
.btn-report-diagnostic {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--brand-primary-subtle);
  color: var(--brand-primary);
  border: 1px solid rgba(76, 158, 95, 0.3);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-report-diagnostic:hover {
  background: var(--brand-primary);
  color: #ffffff;
  box-shadow: 0 0 14px var(--brand-primary-glow);
  transform: translateY(-1px);
}

/* ==========================================================================
   Global Market & Chromium Spellchecker Showcase Section
   ========================================================================== */
.global-showcase-section {
  background: var(--bg-body);
  border-top: 1px solid var(--border-color);
  position: relative;
}

.global-tabs-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.global-tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 24px;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.global-tab-btn:hover {
  border-color: var(--brand-primary);
  color: var(--text-primary);
}

.global-tab-btn.active {
  background: var(--brand-primary);
  color: #ffffff;
  border-color: var(--brand-primary);
  box-shadow: 0 4px 16px var(--brand-primary-glow);
}

.global-tab-panel {
  display: none;
  animation: fadeIn 0.3s ease;
}

.global-tab-panel.active {
  display: block;
}

/* Spellchecker Outer & Inner Cards matching Image 1 */
.spellcheck-outer-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 32px;
  max-width: 1060px;
  margin: 0 auto;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.spellcheck-card-header {
  margin-bottom: 24px;
}

.spellcheck-title {
  font-size: 1.35rem;
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin-bottom: 4px;
}

.spellcheck-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.spellcheck-inner-box {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 24px;
}

.spellcheck-inner-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  gap: 16px;
  flex-wrap: wrap;
}

.spellcheck-inner-heading {
  font-size: 1.05rem;
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin-bottom: 4px;
}

.spellcheck-inner-sub {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.spellcheck-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--brand-primary-subtle);
  border: 1px solid rgba(76, 158, 95, 0.3);
  color: var(--brand-primary);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
}

/* Authentic Grid of 30 Spellchecker Pills (Image 1) */
.spellcheck-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

@media (max-width: 900px) {
  .spellcheck-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 580px) {
  .spellcheck-grid {
    grid-template-columns: 1fr;
  }
}

.spellcheck-pill {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
  font-size: 0.88rem;
  text-align: left;
}

.spellcheck-pill:hover {
  background: var(--bg-surface-elevated);
  border-color: rgba(76, 158, 95, 0.4);
}

.spellcheck-pill.checked {
  border-color: var(--brand-primary);
  background: rgba(76, 158, 95, 0.12);
  box-shadow: 0 0 12px rgba(76, 158, 95, 0.2);
}

.spellcheck-custom-checkbox {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  border: 1.5px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.spellcheck-pill.checked .spellcheck-custom-checkbox {
  background: var(--brand-primary);
  border-color: var(--brand-primary);
  color: #ffffff;
}

.spellcheck-custom-checkbox i {
  font-size: 11px;
  display: none;
}

.spellcheck-pill.checked .spellcheck-custom-checkbox i {
  display: block;
}

.spellcheck-flag {
  font-size: 1.15rem;
  line-height: 1;
}

.spellcheck-pill-label {
  font-weight: var(--font-weight-normal);
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Image 2 - 58 Locales Ecosystem */
.lang-ecosystem-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.lang-filter-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.lang-filter-btn {
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lang-filter-btn:hover {
  border-color: var(--brand-primary);
  color: var(--text-primary);
}

.lang-filter-btn.active {
  background: var(--brand-primary);
  color: #ffffff;
  border-color: var(--brand-primary);
}

.desktop-locales-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 12px;
  max-height: 480px;
  overflow-y: auto;
  padding-right: 6px;
}

.desktop-locale-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.desktop-locale-item:hover {
  border-color: var(--brand-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(76, 158, 95, 0.15);
}

.desktop-locale-flag {
  font-size: 1.4rem;
  line-height: 1;
}

.desktop-locale-info {
  flex: 1;
  min-width: 0;
}

.desktop-locale-name {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.desktop-locale-native {
  font-size: 0.72rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.desktop-locale-file {
  font-family: var(--font-family-mono);
  font-size: 0.68rem;
  background: var(--brand-primary-subtle);
  color: var(--brand-primary);
  border: 1px solid rgba(76, 158, 95, 0.2);
  padding: 2px 6px;
  border-radius: 4px;
  white-space: nowrap;
}

/* ==========================================================================
   Themes Studio Showcase
   ========================================================================== */

.themes-studio {
  background: var(--bg-body-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.theme-tier-tabs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.tier-tab-btn {
  padding: 8px 20px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--text-secondary);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.tier-tab-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-focus);
}

.tier-tab-btn.active {
  background: var(--brand-primary);
  color: #ffffff;
  border-color: var(--brand-primary);
  box-shadow: 0 4px 14px var(--brand-primary-glow);
}

.theme-palette-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 960px;
  margin: 0 auto 40px;
}

.theme-card-btn {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: left;
  color: var(--text-primary) !important;
}

.theme-card-info {
  flex: 1;
  min-width: 0;
}

.theme-card-info h4 {
  color: var(--text-primary) !important;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-fast);
}

.theme-card-btn:hover, .theme-card-btn.active {
  border-color: var(--brand-primary);
  background: var(--bg-surface-elevated);
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(76, 158, 95, 0.25);
}

.theme-card-btn.active {
  outline: 2px solid var(--brand-primary);
  outline-offset: -1px;
}

.theme-color-swatch {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.2);
  flex-shrink: 0;
  box-shadow: var(--shadow-xs);
}

/* ==========================================================================
   Themes Live Interactive Demo Studio (Point 2)
   ========================================================================== */

.themes-demo-stage {
  max-width: 960px;
  margin: 40px auto 0;
}

.theme-demo-window {
  --demo-primary: #4C9E5F;
  --demo-primary-glow: rgba(76, 158, 95, 0.4);
  --demo-primary-subtle: rgba(76, 158, 95, 0.15);
  --demo-bg: #0b0f13;
  --demo-surface: #131b22;
  --demo-surface-elevated: #1a232c;
  --demo-border: rgba(255, 255, 255, 0.1);
  --demo-text: #f0f6fc;
  --demo-text-muted: #8b949e;
  --demo-bubble-in: #1c2732;
  --demo-bubble-out: var(--demo-primary);

  background: var(--demo-bg);
  color: var(--demo-text);
  border: 1px solid var(--demo-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl), 0 0 30px var(--demo-primary-glow);
  transition: background 0.35s var(--ease-sentinel),
              color 0.35s var(--ease-sentinel),
              border-color 0.35s var(--ease-sentinel),
              box-shadow 0.35s var(--ease-sentinel);
}

/* Light mode override for demo window */
.theme-demo-window[data-demo-mode="light"] {
  --demo-bg: #f8fafc;
  --demo-surface: #ffffff;
  --demo-surface-elevated: #f1f5f9;
  --demo-border: rgba(0, 0, 0, 0.1);
  --demo-text: #0f172a;
  --demo-text-muted: #64748b;
  --demo-bubble-in: #e2e8f0;
  --demo-bubble-out: var(--demo-primary);
}

.demo-window-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  background: var(--demo-surface);
  border-bottom: 1px solid var(--demo-border);
  gap: 12px;
}

.demo-window-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.demo-window-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
}

.demo-title-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 10px var(--demo-primary-glow);
  transition: background 0.3s ease;
}

.demo-active-badge {
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--demo-primary-subtle);
  color: var(--demo-primary);
  border: 1px solid var(--demo-border);
}

.demo-mode-switcher {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--demo-surface-elevated);
  padding: 3px;
  border-radius: var(--radius-full);
  border: 1px solid var(--demo-border);
}

.demo-mode-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: var(--font-weight-medium);
  color: var(--demo-text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.demo-mode-btn.active {
  background: var(--demo-primary);
  color: #ffffff;
  box-shadow: 0 2px 8px var(--demo-primary-glow);
}

.demo-window-body {
  display: flex;
  height: 380px;
}

.demo-accounts-bar {
  width: 54px;
  background: var(--demo-surface);
  border-right: 1px solid var(--demo-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px 0;
  gap: 14px;
}

.demo-acc-tab {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--demo-text-muted);
  cursor: pointer;
  position: relative;
  transition: all var(--transition-fast);
}

.demo-acc-tab.active {
  background: var(--demo-primary-subtle);
  color: var(--demo-primary);
  box-shadow: 0 0 12px var(--demo-primary-glow);
}

.demo-badge-dot {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 8px;
  height: 8px;
  background: #ef4444;
  border-radius: 50%;
}

.demo-chats-sidebar {
  width: 210px;
  background: var(--demo-surface);
  border-right: 1px solid var(--demo-border);
  display: flex;
  flex-direction: column;
}

.demo-chat-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--demo-border);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.demo-chat-row.active {
  background: var(--demo-surface-elevated);
}

.demo-chat-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--demo-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: bold;
  flex-shrink: 0;
}

.demo-chat-avatar.secondary {
  background: #3b82f6;
}

.demo-chat-info {
  flex: 1;
  min-width: 0;
}

.demo-chat-name {
  font-size: 0.8rem;
  font-weight: var(--font-weight-semibold);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.demo-chat-snippet {
  font-size: 0.7rem;
  color: var(--demo-text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.demo-unread-badge {
  background: var(--demo-primary);
  color: #fff;
  font-size: 0.65rem;
  font-weight: bold;
  padding: 1px 6px;
  border-radius: var(--radius-full);
}

.demo-conversation-pane {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--demo-bg);
}

.demo-chat-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  background: var(--demo-surface);
  border-bottom: 1px solid var(--demo-border);
}

.demo-topbar-info strong {
  display: block;
  font-size: 0.82rem;
}

.demo-topbar-info span {
  font-size: 0.7rem;
  color: var(--demo-text-muted);
}

.demo-topbar-icons {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--demo-text-muted);
  font-size: 0.85rem;
}

.demo-messages-area {
  flex: 1;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow-y: auto;
}

.demo-bubble {
  max-width: 75%;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  font-size: 0.82rem;
  line-height: 1.4;
  position: relative;
}

.demo-bubble-in {
  align-self: flex-start;
  background: var(--demo-bubble-in);
  color: var(--demo-text);
  border-bottom-left-radius: 2px;
}

.demo-bubble-out {
  align-self: flex-end;
  background: var(--demo-bubble-out);
  color: #ffffff;
  border-bottom-right-radius: 2px;
  box-shadow: 0 4px 12px var(--demo-primary-glow);
}

.demo-bubble-time {
  display: block;
  font-size: 0.62rem;
  opacity: 0.8;
  margin-top: 4px;
  text-align: right;
}

.demo-chat-input-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  background: var(--demo-surface);
  border-top: 1px solid var(--demo-border);
}

.demo-input-mock {
  flex: 1;
  background: var(--demo-bg);
  border: 1px solid var(--demo-border);
  padding: 8px 14px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  color: var(--demo-text-muted);
}

.demo-send-btn {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--demo-primary);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  box-shadow: 0 2px 8px var(--demo-primary-glow);
  cursor: pointer;
}

/* ==========================================================================
   Benchmark & Comparison Matrix
   ========================================================================== */

.performance-card {
  background: var(--bg-card);
  backdrop-filter: var(--blur-intense);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 48px;
  max-width: 880px;
  margin: 0 auto;
  box-shadow: var(--shadow-lg);
}

.benchmark-row {
  margin-bottom: 28px;
}

.benchmark-meta {
  display: flex;
  justify-content: space-between;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  margin-bottom: 10px;
}

.progress-track {
  height: 20px;
  background: var(--bg-surface-elevated);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
  border: 1px solid var(--border-color);
}

.progress-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 1.2s var(--ease-sentinel);
}

.fill-danger {
  background: linear-gradient(90deg, #f59e0b, #ef4444);
  box-shadow: 0 0 16px rgba(239, 68, 68, 0.4);
}

.fill-success {
  background: linear-gradient(90deg, #10b981, var(--brand-primary));
  box-shadow: 0 0 20px var(--brand-primary-glow);
}

.benchmark-savings-pill {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--brand-primary-subtle);
  border: 1px solid rgba(76, 158, 95, 0.3);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-top: 36px;
}

.comparison-wrapper {
  overflow-x: auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.comparison-table th, 
.comparison-table td {
  padding: 18px 20px;
  border-bottom: 1px solid var(--border-color);
  font-size: var(--font-size-sm);
}

.comparison-table th {
  background: var(--bg-surface-elevated);
  font-weight: var(--font-weight-semibold);
  color: var(--text-secondary);
}

.comparison-table th.col-highlight,
.comparison-table td.col-highlight {
  background: var(--brand-primary-subtle);
  border-left: 2px solid var(--brand-primary);
  border-right: 2px solid var(--brand-primary);
  color: var(--text-primary);
  font-weight: var(--font-weight-semibold);
}

.feature-check { color: #10b981; margin-right: 6px; }
.feature-cross { color: #ef4444; margin-right: 6px; }

/* ==========================================================================
   Downloads Section
   ========================================================================== */

.downloads-section {
  background: var(--bg-body-secondary);
  border-top: 1px solid var(--border-color);
}

.os-tabs-nav {
  display: flex;
  justify-content: center;
  gap: 14px;
  margin-bottom: 40px;
}

.os-tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.os-tab-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-focus);
  transform: translateY(-2px);
}

.os-tab-btn.active {
  background: var(--brand-primary);
  color: #ffffff;
  border-color: var(--brand-primary);
  box-shadow: 0 6px 20px var(--brand-primary-glow);
}

.os-downloads-panel {
  display: none;
}
.os-downloads-panel.active {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 980px;
  margin: 0 auto;
}

.download-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-fast);
}

.download-card:hover {
  border-color: var(--brand-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.download-card-header {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 20px;
}

.download-type-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--brand-primary-subtle);
  color: var(--brand-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}

.asset-size-badge {
  font-family: var(--font-family-mono);
  font-size: 0.72rem;
  background: var(--bg-surface-elevated);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  margin-left: 6px;
  color: var(--text-muted);
}

.terminal-copy-box {
  background: var(--bg-body);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  color: var(--brand-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

/* ==========================================================================
   FAQ & Footer
   ========================================================================== */

.faq-container {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item.active {
  border-color: var(--border-focus);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1.02rem;
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  cursor: pointer;
}

.faq-icon {
  color: var(--brand-primary);
  transition: transform var(--transition-fast);
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease-out;
  padding: 0 24px;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-normal);
}

.faq-item.active .faq-answer {
  max-height: 250px;
  padding-bottom: 20px;
}

.site-footer {
  background: var(--bg-body-secondary);
  border-top: 1px solid var(--border-color);
  padding: 80px 0 36px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 60px;
}

.footer-brand p {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-top: 16px;
  max-width: 320px;
}

.footer-credits {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin-top: 12px;
}

.footer-col h4 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  margin-bottom: 20px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--brand-primary);
}

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

/* ==========================================================================
   Responsive Adaptations & View Transitions API (Points 1, 4 & 6)
   ========================================================================== */

/* View Transitions Circular Ripple Animation */
::view-transition-old(root),
::view-transition-new(root) {
  animation: none;
  mix-blend-mode: normal;
}

@media (max-width: 1180px) {
  .mobile-nav-toggle {
    display: inline-flex !important;
  }
  
  .nav-wrapper {
    position: fixed;
    top: 76px;
    left: 0;
    right: 0;
    background: var(--bg-surface-elevated);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-xl);
    padding: 24px;
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s var(--ease-sentinel), opacity 0.3s var(--ease-sentinel);
    z-index: var(--z-modal);
  }

  .nav-wrapper.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-menu {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    width: 100%;
  }

  .nav-link {
    font-size: 1.05rem;
    padding: 8px 0;
    width: 100%;
  }
}

@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .theme-palette-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .benchmark-row { gap: 16px; }
}

@media (max-width: 768px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: 1fr; }
  .theme-palette-grid { grid-template-columns: repeat(2, 1fr); }
  .os-downloads-panel.active { grid-template-columns: 1fr; }
  .mockup-chats-list { display: none; }
  .demo-chats-sidebar { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .lang-dropdown-panel { width: 280px; }
  .demo-mode-switcher span { display: none; }
  .demo-window-body { height: 340px; }
  .comparison-wrapper { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .comparison-table { min-width: 680px; }
}

@media (max-width: 540px) {
  .theme-palette-grid { grid-template-columns: 1fr; }
  .brand-badge { display: none; }
  .hero-cta-group { flex-direction: column; width: 100%; }
  .hero-cta-group a { width: 100%; justify-content: center; }
  .demo-window-title span:last-child { display: none; }
}