/**
 * CloudDrop - Modern Dark Theme with Glassmorphism
 * A beautiful, responsive UI for P2P file sharing
 */

/* ============================================
   CSS Custom Properties (Design Tokens)
   ============================================ */
:root {
  /* Colors - Dark Theme */
  --bg-primary: #0f0f23;
  --bg-secondary: #1a1a2e;
  --bg-tertiary: #16213e;
  --bg-glass: rgba(255, 255, 255, 0.05);
  --bg-glass-hover: rgba(255, 255, 255, 0.08);
  
  /* Accent Colors */
  --accent-primary: #60a5fa;
  --accent-secondary: #a78bfa;
  --accent-gradient: linear-gradient(135deg, #60a5fa 0%, #a78bfa 100%);
  --accent-glow: rgba(96, 165, 250, 0.3);
  
  /* Text Colors */
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  /* Status Colors */
  --status-success: #34d399;
  --status-warning: #fbbf24;
  --status-error: #f87171;
  --status-info: #60a5fa;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px var(--accent-glow);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;
  
  /* Typography - System font stack optimized for Chinese and global users */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI',
               'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei',
               'Helvetica Neue', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
}

/* ============================================
   Reset & Base Styles
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Animated background gradient */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: 
    radial-gradient(ellipse 80% 50% at 20% 40%, rgba(96, 165, 250, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(167, 139, 250, 0.1) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

/* ============================================
   App Layout
   ============================================ */
.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ============================================
   Header
   ============================================ */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-xl);
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.logo-icon {
  width: 36px;
  height: 36px;
}

.logo-text {
  font-size: var(--font-size-xl);
  font-weight: 600;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.connection-status {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  background: var(--bg-glass);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--status-warning);
  animation: pulse 2s infinite;
}

.connection-status.connected .status-dot {
  background: var(--status-success);
  animation: none;
}

.connection-status.disconnected .status-dot {
  background: var(--status-error);
  animation: none;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ============================================
   Main Content
   ============================================ */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl);
}

/* ============================================
   Empty State
   ============================================ */
.empty-state {
  text-align: center;
  animation: fadeIn 0.5s ease;
}

.empty-state.hidden {
  display: none;
}

.empty-icon {
  width: 120px;
  height: 120px;
  margin: 0 auto var(--space-xl);
  animation: float 4s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.empty-title {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}

.empty-description {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  max-width: 400px;
  margin: 0 auto;
}

.empty-description strong {
  color: var(--accent-blue);
  font-weight: 600;
}

.empty-description-hint {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  max-width: 400px;
  margin: var(--space-xs) auto 0;
  padding: var(--space-xs) var(--space-sm);
  background: rgba(96, 165, 250, 0.1);
  border-radius: var(--radius-md);
  border: 1px solid rgba(96, 165, 250, 0.2);
}

/* ============================================
   Peers Grid
   ============================================ */
.peers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 160px));
  gap: var(--space-lg);
  justify-content: center;
  width: 100%;
  max-width: 800px;
}

.peers-grid:empty {
  display: none;
}

.peers-grid:empty + .empty-state,
.peers-grid:not(:empty) ~ .empty-state {
  display: none;
}

/* ============================================
   Peer Card
   ============================================ */
.peer-card {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-lg);
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-normal);
  animation: scaleIn 0.3s ease;
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.peer-card:hover {
  background: var(--bg-glass-hover);
  border-color: rgba(96, 165, 250, 0.3);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.peer-card:active {
  transform: translateY(-2px);
}

.peer-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  position: relative;
  overflow: hidden;
}

.peer-avatar::before {
  content: '';
  position: absolute;
  inset: 2px;
  border-radius: 50%;
  background: var(--bg-secondary);
}

.peer-avatar svg {
  width: 32px;
  height: 32px;
  position: relative;
  z-index: 1;
}

.peer-avatar.desktop svg { color: var(--accent-primary); }
.peer-avatar.mobile svg { color: var(--accent-secondary); }
.peer-avatar.tablet svg { color: var(--status-success); }

.peer-name {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-primary);
  text-align: center;
  word-break: break-word;
}

.peer-device {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin-top: var(--space-xs);
}

.peer-browser {
  font-size: 10px;
  color: var(--text-muted);
  opacity: 0.7;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

/* ============================================
   Connection Mode Badge (on peer card)
   ============================================ */
.connection-mode-badge {
  position: absolute;
  top: var(--space-sm);
  left: var(--space-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  transition: all var(--transition-normal);
  opacity: 0;
  transform: scale(0.8);
}

.connection-mode-badge[data-mode="p2p"],
.connection-mode-badge[data-mode="relay"],
.connection-mode-badge[data-mode="connecting"] {
  opacity: 1;
  transform: scale(1);
}

/* P2P mode - green */
.connection-mode-badge[data-mode="p2p"] {
  background: rgba(52, 211, 153, 0.2);
  color: var(--status-success);
  border: 1px solid rgba(52, 211, 153, 0.4);
  box-shadow: 0 0 8px rgba(52, 211, 153, 0.3);
}

/* Relay mode - blue */
.connection-mode-badge[data-mode="relay"] {
  background: rgba(96, 165, 250, 0.2);
  color: var(--accent-primary);
  border: 1px solid rgba(96, 165, 250, 0.4);
  box-shadow: 0 0 8px rgba(96, 165, 250, 0.3);
}

/* Connecting state - orange */
.connection-mode-badge[data-mode="connecting"] {
  background: rgba(251, 191, 36, 0.2);
  color: var(--status-warning);
  border: 1px solid rgba(251, 191, 36, 0.4);
  box-shadow: 0 0 8px rgba(251, 191, 36, 0.3);
}

.connection-mode-badge .mode-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 12px;
  height: 12px;
}

.connection-mode-badge .mode-icon svg {
  width: 100%;
  height: 100%;
}

/* Hide text - icon only */
.connection-mode-badge .mode-text {
  display: none;
}

/* Spin animation for connecting icon */
.connection-mode-badge .mode-icon .spin {
  animation: spin 1s linear infinite;
}

.peer-action-btn {
  position: absolute;
  top: var(--space-sm);
  right: var(--space-sm);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-normal);
  opacity: 0;
  transform: scale(0.8);
  z-index: 10;
}

.peer-card:hover .peer-action-btn,
.peer-action-btn.has-unread {
  opacity: 1;
  transform: scale(1);
}

.peer-action-btn:hover {
  background: var(--accent-gradient);
  color: white;
  border-color: transparent;
  box-shadow: 0 0 15px var(--accent-glow);
}

.peer-action-btn svg {
  width: 14px;
  height: 14px;
}

.unread-badge {
  position: absolute;
  top: -4px;
  right: -4px;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  background: #ef4444;
  color: white;
  font-size: 11px;
  font-weight: 600;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
  animation: badgePulse 2s ease-in-out infinite;
}

@keyframes badgePulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

/* ============================================
   Drop Zone Overlay
   ============================================ */
.drop-zone {
  position: fixed;
  inset: 0;
  background: rgba(15, 15, 35, 0.95);
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: 1000;
}

.drop-zone.active {
  opacity: 1;
  visibility: visible;
}

.drop-zone-content {
  text-align: center;
  animation: bounce 1s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

.drop-icon {
  width: 80px;
  height: 80px;
  color: var(--accent-primary);
  margin-bottom: var(--space-lg);
}

.drop-text {
  font-size: var(--font-size-xl);
  font-weight: 500;
  color: var(--text-primary);
}

/* ============================================
   Modal
   ============================================ */
.modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: 2000;
}

.modal.active {
  opacity: 1;
  visibility: visible;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background: var(--bg-secondary);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  min-width: 320px;
  max-width: 90vw;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.9) translateY(20px);
  transition: transform var(--transition-normal);
  box-shadow: var(--shadow-lg);
}

.modal.active .modal-content {
  transform: scale(1) translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}

.modal-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
}

.modal-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-glass);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--bg-glass-hover);
  color: var(--text-primary);
}

.modal-close svg {
  width: 18px;
  height: 18px;
}

.modal-body {
  color: var(--text-secondary);
}

/* ============================================
   Transfer Progress
   ============================================ */
.transfer-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-md);
}

/* Waiting state - vertical layout */
.transfer-info.waiting {
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  text-align: center;
}

.transfer-info.waiting .file-name {
  max-width: 100%;
  font-size: 1rem;
}

.transfer-info.waiting .file-size {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.file-name {
  font-weight: 500;
  color: var(--text-primary);
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-size {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.progress-container {
  height: 8px;
  background: var(--bg-glass);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: var(--space-md);
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
  transition: width var(--transition-fast);
}

/* Waiting animation - indeterminate progress */
.progress-container.waiting .progress-bar {
  width: 30%;
  animation: waiting-progress 1.5s ease-in-out infinite;
}

@keyframes waiting-progress {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(400%); }
}

.transfer-stats {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* Waiting state - center single element */
.transfer-stats.waiting {
  justify-content: center;
}

.transfer-stats.waiting #transferPercent,
.transfer-stats.waiting #transferSpeed {
  display: none;
}

/* Transfer Cancel Button */
.transfer-actions {
  margin-top: var(--space-lg);
  display: flex;
  justify-content: center;
}

.btn-cancel-transfer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-xl);
  min-width: 140px;
  background: rgba(248, 113, 113, 0.1);
  border: 1px solid rgba(248, 113, 113, 0.3);
  color: var(--status-error);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-cancel-transfer:hover {
  background: rgba(248, 113, 113, 0.2);
  border-color: rgba(248, 113, 113, 0.5);
  box-shadow: 0 0 20px rgba(248, 113, 113, 0.2);
}

.btn-cancel-transfer:active {
  transform: scale(0.98);
}

.btn-cancel-transfer svg {
  width: 18px;
  height: 18px;
}

.btn-cancel-transfer:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Mobile optimization for cancel button */
@media (max-width: 640px) {
  .btn-cancel-transfer {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    min-height: 48px;
  }
}

/* ============================================
   Transfer Mode Indicator (in transfer modal)
   ============================================ */
.transfer-mode-indicator {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 500;
  transition: all var(--transition-normal);
}

/* P2P mode styling - green */
.transfer-mode-indicator[data-mode="p2p"] {
  background: rgba(52, 211, 153, 0.12);
  color: var(--status-success);
  border: 1px solid rgba(52, 211, 153, 0.25);
}

/* Relay mode styling - blue */
.transfer-mode-indicator[data-mode="relay"] {
  background: rgba(96, 165, 250, 0.12);
  color: var(--accent-primary);
  border: 1px solid rgba(96, 165, 250, 0.25);
}

.transfer-mode-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
}

.transfer-mode-icon svg {
  width: 100%;
  height: 100%;
}

.transfer-mode-text {
  white-space: nowrap;
}

/* Waiting state for transfer indicator */
.transfer-mode-indicator[data-mode="waiting"] {
  background: rgba(251, 191, 36, 0.12);
  color: var(--status-warning);
  border: 1px solid rgba(251, 191, 36, 0.25);
}

.transfer-mode-indicator[data-mode="waiting"] .transfer-mode-icon {
  animation: pulse 1.5s ease-in-out infinite;
}

/* ============================================
   Receive Confirmation Modal (Enhanced)
   ============================================ */
.receive-confirm-modal {
  max-width: 400px;
}

.receive-confirm-modal .modal-body {
  padding: 0 var(--space-lg) var(--space-lg);
}

/* Sender Info Section */
.receive-sender-info {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--bg-glass);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-lg);
}

.sender-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  flex-shrink: 0;
}

.sender-avatar::before {
  content: '';
  position: absolute;
  inset: 2px;
  border-radius: 50%;
  background: var(--bg-secondary);
}

.sender-avatar svg {
  width: 24px;
  height: 24px;
  position: relative;
  z-index: 1;
  color: var(--accent-primary);
}

.sender-avatar.mobile svg { color: var(--accent-secondary); }
.sender-avatar.tablet svg { color: var(--status-success); }

.sender-details {
  flex: 1;
  min-width: 0;
}

.sender-name {
  display: block;
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sender-device-info {
  display: block;
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

/* Receive Mode Badge */
.receive-mode-badge {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 500;
  flex-shrink: 0;
}

.receive-mode-badge[data-mode="p2p"] {
  background: rgba(52, 211, 153, 0.15);
  color: var(--status-success);
  border: 1px solid rgba(52, 211, 153, 0.3);
}

.receive-mode-badge[data-mode="relay"] {
  background: rgba(96, 165, 250, 0.15);
  color: var(--accent-primary);
  border: 1px solid rgba(96, 165, 250, 0.3);
}

.receive-mode-badge .mode-icon {
  width: 12px;
  height: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.receive-mode-badge .mode-icon svg {
  width: 100%;
  height: 100%;
}

/* File Preview Card */
.receive-file-card {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  padding: var(--space-lg);
  background: linear-gradient(135deg, rgba(96, 165, 250, 0.08) 0%, rgba(167, 139, 250, 0.08) 100%);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-lg);
}

.file-icon-large {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-gradient);
  border-radius: var(--radius-lg);
  color: white;
  flex-shrink: 0;
}

.file-icon-large svg {
  width: 32px;
  height: 32px;
}

/* File type specific icons */
.file-icon-large.image {
  background: linear-gradient(135deg, #f472b6 0%, #ec4899 100%);
}

.file-icon-large.video {
  background: linear-gradient(135deg, #f87171 0%, #ef4444 100%);
}

.file-icon-large.audio {
  background: linear-gradient(135deg, #a78bfa 0%, #8b5cf6 100%);
}

.file-icon-large.document {
  background: linear-gradient(135deg, #60a5fa 0%, #3b82f6 100%);
}

.file-icon-large.archive {
  background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
}

.file-icon-large.code {
  background: linear-gradient(135deg, #34d399 0%, #10b981 100%);
}

.file-details {
  flex: 1;
  min-width: 0;
}

.file-name-large {
  display: block;
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
  word-break: break-all;
  line-height: 1.4;
}

.file-meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.file-size-large {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  font-weight: 500;
}

.file-type-label {
  font-size: 11px;
  padding: 2px 8px;
  background: var(--bg-glass);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Security Notice */
.receive-security-notice {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: rgba(52, 211, 153, 0.1);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
  font-size: var(--font-size-xs);
  color: var(--status-success);
}

.receive-security-notice svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

/* Enhanced Action Buttons */
.receive-actions {
  display: flex;
  gap: var(--space-md);
  justify-content: stretch;
}

.receive-actions .btn {
  flex: 1;
  justify-content: center;
}

.btn-large {
  padding: var(--space-md) var(--space-lg);
  font-size: var(--font-size-base);
  min-height: 52px;
}

.btn-large svg {
  width: 20px;
  height: 20px;
}

/* Decline button hover - red tint */
.receive-actions .btn-secondary:hover {
  background: rgba(248, 113, 113, 0.15);
  border-color: rgba(248, 113, 113, 0.4);
  color: var(--status-error);
}

/* Accept button glow */
.receive-actions .btn-primary:hover {
  box-shadow: 0 0 30px rgba(96, 165, 250, 0.4);
}

/* File Download Modal */
.download-file-info {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  padding: var(--space-lg);
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-lg);
}

.download-file-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(52, 211, 153, 0.2), rgba(96, 165, 250, 0.2));
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.download-file-icon svg {
  width: 28px;
  height: 28px;
  stroke: var(--status-success);
}

.download-file-details {
  flex: 1;
  min-width: 0;
}

.download-file-name {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 4px 0;
  word-break: break-all;
}

.download-file-size {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin: 0;
}

.download-actions {
  display: flex;
  gap: var(--space-md);
}

.download-actions .btn {
  flex: 1;
  padding: var(--space-md) var(--space-lg);
}

.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  text-decoration: none;
}

.download-btn svg {
  width: 18px;
  height: 18px;
}

/* Legacy receive-prompt for backward compatibility */
.receive-prompt {
  margin-bottom: var(--space-lg);
  color: var(--text-primary);
  font-size: var(--font-size-base);
}

/* Trust Device Option */
.receive-trust-option {
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  text-align: center;
}

.btn-trust {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  background: transparent;
  border: 1px dashed rgba(52, 211, 153, 0.4);
  border-radius: var(--radius-lg);
  color: var(--status-success);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  width: 100%;
}

.btn-trust:hover {
  background: rgba(52, 211, 153, 0.1);
  border-style: solid;
  border-color: rgba(52, 211, 153, 0.6);
}

.btn-trust:active {
  transform: scale(0.98);
}

.btn-trust svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.trust-hint {
  margin-top: var(--space-sm);
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

/* Trusted device badge on peer card */
.peer-trusted-badge {
  position: absolute;
  bottom: var(--space-sm);
  left: var(--space-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: rgba(52, 211, 153, 0.2);
  border: 1px solid rgba(52, 211, 153, 0.4);
  border-radius: 50%;
  color: var(--status-success);
  cursor: pointer;
  transition: all var(--transition-fast);
  z-index: 10;
}

.peer-trusted-badge:hover {
  background: rgba(248, 113, 113, 0.2);
  border-color: rgba(248, 113, 113, 0.5);
  color: var(--status-error);
  transform: scale(1.1);
}

.peer-trusted-badge:hover::after {
  content: '取消信任';
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  padding: 4px 8px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  font-size: 11px;
  white-space: nowrap;
  color: var(--text-secondary);
  margin-bottom: 4px;
  box-shadow: var(--shadow-md);
}

.peer-trusted-badge svg {
  width: 14px;
  height: 14px;
}

/* GitHub link in header */
.github-link {
  margin-left: var(--space-xs);
  text-decoration: none;
  color: var(--text-secondary);
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.github-link:hover {
  color: var(--text-primary);
  transform: scale(1.1);
}

.github-link svg {
  width: 20px;
  height: 20px;
}

/* Generic Confirm Dialog */
.confirm-dialog {
  max-width: 360px;
  text-align: center;
  padding: var(--space-xl);
}

.confirm-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(251, 191, 36, 0.15);
  border-radius: 50%;
  color: #fbbf24;
}

.confirm-icon svg {
  width: 32px;
  height: 32px;
}

.confirm-icon.danger {
  background: rgba(248, 113, 113, 0.15);
  color: var(--status-error);
}

.confirm-icon.success {
  background: rgba(52, 211, 153, 0.15);
  color: var(--status-success);
}

.confirm-icon.info {
  background: rgba(96, 165, 250, 0.15);
  color: var(--accent-blue);
}

.confirm-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.confirm-message {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-xl);
}

.confirm-actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
}

.confirm-actions .btn {
  min-width: 100px;
  padding: var(--space-sm) var(--space-lg);
}

.btn-danger {
  background: linear-gradient(135deg, #f87171 0%, #ef4444 100%);
  color: white;
  border: none;
}

.btn-danger:hover {
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
  transform: translateY(-1px);
}

/* Mobile optimization for receive modal */
@media (max-width: 640px) {
  .receive-confirm-modal {
    max-width: 100%;
  }
  
  .receive-sender-info {
    flex-wrap: wrap;
  }
  
  .receive-mode-badge {
    order: 3;
    margin-top: var(--space-sm);
    margin-left: auto;
  }
  
  .file-icon-large {
    width: 56px;
    height: 56px;
  }
  
  .file-icon-large svg {
    width: 28px;
    height: 28px;
  }
  
  .file-name-large {
    font-size: var(--font-size-sm);
  }
  
  .receive-actions {
    flex-direction: column;
  }
  
  .receive-actions .btn {
    width: 100%;
  }
  
  .btn-trust {
    padding: var(--space-md) var(--space-lg);
  }
}

/* ============================================
   Text Modal
   ============================================ */
.text-input {
  width: 100%;
  min-height: 120px;
  padding: var(--space-md);
  background: var(--bg-glass);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: inherit;
  font-size: var(--font-size-base);
  resize: vertical;
  margin-bottom: var(--space-lg);
  transition: border-color var(--transition-fast);
}

.text-input:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.text-input::placeholder {
  color: var(--text-muted);
}

.text-actions {
  display: flex;
  gap: var(--space-md);
  justify-content: flex-end;
}

/* ============================================
   Received Text Modal
   ============================================ */
.received-from {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

.received-text {
  padding: var(--space-md);
  background: var(--bg-glass);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: var(--font-size-base);
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 200px;
  overflow-y: auto;
  margin-bottom: var(--space-lg);
}

/* ============================================
   Room Info & Join Room
   ============================================ */
.room-info {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  background: var(--bg-glass);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

/* Desktop: make room code clickable */
@media (min-width: 641px) {
  .room-code {
    cursor: pointer;
    padding: 2px 6px;
    margin: -2px 0;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
  }
  
  .room-code:hover {
    background: rgba(96, 165, 250, 0.15);
  }
}

.device-name-info {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  background: var(--bg-glass);
  border-radius: var(--radius-full);
}

.device-label {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

.device-name {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-primary);
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.room-label {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

.room-code {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--accent-primary);
  font-family: monospace;
  letter-spacing: 0.05em;
}

.btn-icon {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  color: var(--text-primary);
  background: var(--bg-glass-hover);
}

.btn-icon svg {
  width: 14px;
  height: 14px;
}

/* Small icon button */
.btn-icon-sm {
  width: 20px;
  height: 20px;
}

.btn-icon-sm svg {
  width: 12px;
  height: 12px;
}

/* Clickable room code */
.room-code {
  cursor: pointer;
  transition: all var(--transition-fast);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

.room-code:hover {
  background: var(--bg-glass-hover);
  color: var(--accent-primary);
}

.room-code:active {
  transform: scale(0.98);
}

.btn-sm {
  padding: var(--space-xs) var(--space-md);
  font-size: var(--font-size-xs);
}

.room-input {
  width: 100%;
  padding: var(--space-md);
  background: var(--bg-glass);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: monospace;
  font-size: var(--font-size-lg);
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: var(--space-lg);
  transition: border-color var(--transition-fast);
}

.room-input:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.room-input::placeholder {
  color: var(--text-muted);
  text-transform: none;
  letter-spacing: normal;
}

.modal-description {
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.name-input {
  width: 100%;
  padding: var(--space-md);
  background: var(--bg-glass);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: inherit;
  font-size: var(--font-size-base);
  margin-bottom: var(--space-lg);
  transition: border-color var(--transition-fast);
}

.name-input:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.name-input::placeholder {
  color: var(--text-muted);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  padding: var(--space-sm) var(--space-lg);
  border: none;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
}

.btn-primary {
  background: var(--accent-gradient);
  color: white;
}

.btn-primary:hover {
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-glass);
  color: var(--text-secondary);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
  background: var(--bg-glass-hover);
  color: var(--text-primary);
}

/* ============================================
   Toast Notifications
   ============================================ */
.toast-container {
  position: fixed;
  top: 80px;
  right: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  z-index: 3000;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-secondary);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  animation: slideInFromTop 0.3s ease;
  max-width: 360px;
}

@keyframes slideInFromTop {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.toast.hiding {
  animation: slideOutToTop 0.3s ease forwards;
}

@keyframes slideOutToTop {
  to {
    opacity: 0;
    transform: translateY(-20px);
  }
}

.toast-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.toast.success .toast-icon { color: var(--status-success); }
.toast.error .toast-icon { color: var(--status-error); }
.toast.info .toast-icon { color: var(--status-info); }
.toast.warning .toast-icon { color: var(--status-warning); }
.toast.loading .toast-icon { color: var(--accent-primary); }
.toast.loading .toast-icon svg { animation: spin 1s linear infinite; }

.toast-message {
  font-size: var(--font-size-sm);
  color: var(--text-primary);
}

/* ============================================
   Responsive Design - Mobile First Optimization
   ============================================ */

/* Safe area support for notched devices */
:root {
  --safe-area-top: env(safe-area-inset-top, 0px);
  --safe-area-bottom: env(safe-area-inset-bottom, 0px);
  --safe-area-left: env(safe-area-inset-left, 0px);
  --safe-area-right: env(safe-area-inset-right, 0px);
}

/* Touch-friendly tap highlight */
@media (hover: none) {
  * {
    -webkit-tap-highlight-color: rgba(96, 165, 250, 0.2);
  }
}

/* Medium screens (tablets) */
@media (max-width: 768px) {
  .header {
    padding: var(--space-md);
    gap: var(--space-sm);
  }
  
  .header-right {
    gap: var(--space-sm);
  }
  
  .device-name {
    max-width: 80px;
  }
  
  .room-code {
    font-size: var(--font-size-xs);
  }
  
  .security-section {
    padding: var(--space-md) var(--space-lg);
  }
}

/* Small screens (mobile) */
@media (max-width: 640px) {
  /* App layout with bottom bar space */
  .app {
    padding-bottom: calc(70px + var(--safe-area-bottom));
  }
  
  /* Header: 单行紧凑布局，使用fixed定位避免缩放后错位 */
  .header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    flex-direction: row;
    flex-wrap: nowrap;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    padding-top: calc(var(--space-sm) + var(--safe-area-top));
    gap: var(--space-sm);
    min-height: 56px;
  }
  
  .logo {
    flex-shrink: 0;
  }
  
  .logo-text {
    font-size: var(--font-size-base);
    display: none; /* 移动端隐藏文字，只显示图标 */
  }
  
  .logo-icon {
    width: 32px;
    height: 32px;
  }
  
  /* Header right: 紧凑横向布局 */
  .header-right {
    display: flex;
    flex-wrap: nowrap;
    gap: var(--space-xs);
    flex: 1;
    justify-content: flex-end;
    align-items: center;
    overflow: visible; /* 改为visible以允许下拉菜单显示 */
  }
  
  /* 设备名称和房间号 - 胶囊样式 */
  .device-name-info,
  .room-info {
    padding: 4px 10px;
    flex-shrink: 1;
    min-width: 0;
    border-radius: var(--radius-md);
  }
  
  .device-label,
  .room-label {
    display: none;
  }
  
  .device-name {
    max-width: 60px;
    font-size: 11px;
  }
  
  .room-code {
    font-size: 11px;
    letter-spacing: 0.08em;
  }
  
  .room-info .btn-icon {
    width: 20px;
    height: 20px;
  }
  
  .room-info .btn-icon svg {
    width: 11px;
    height: 11px;
  }
  
  /* 分隔线隐藏 */
  .room-info > div[style*="width: 1px"] {
    display: none;
  }
  
  /* 连接状态 - 小圆点 */
  .connection-status {
    padding: 4px 8px;
    font-size: 10px;
    flex-shrink: 0;
  }
  
  .status-dot {
    width: 6px;
    height: 6px;
  }
  
  .status-text {
    display: none;
  }
  
  /* 主内容区 - 需要补偿fixed header的高度 */
  .main {
    padding: var(--space-md);
    padding-top: calc(56px + var(--safe-area-top) + var(--space-lg));
    min-height: calc(100vh - 56px - 70px - var(--safe-area-top) - var(--safe-area-bottom));
    justify-content: flex-start;
    padding-bottom: var(--space-xl);
  }
  
  /* 空状态优化 */
  .empty-state {
    padding: var(--space-xl) var(--space-md);
    max-width: 300px;
  }
  
  .empty-icon {
    width: 100px;
    height: 100px;
    margin-bottom: var(--space-lg);
  }
  
  .empty-title {
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-sm);
  }
  
  .empty-description {
    font-size: var(--font-size-sm);
    line-height: 1.5;
    color: var(--text-muted);
  }

  .empty-description-hint {
    font-size: var(--font-size-xs);
    margin-top: var(--space-sm);
    padding: var(--space-sm);
  }

  /* Peer 网格 - 大卡片触摸友好 */
  .peers-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
    width: 100%;
    max-width: 100%;
    padding: 0;
  }
  
  .peer-card {
    padding: var(--space-lg) var(--space-md);
    border-radius: var(--radius-xl);
    min-height: 140px;
    /* 触摸反馈 */
    transition: transform 0.15s ease, background 0.15s ease;
  }
  
  .peer-card:active {
    transform: scale(0.96);
    background: var(--bg-glass-hover);
  }
  
  .peer-avatar {
    width: 56px;
    height: 56px;
    margin-bottom: var(--space-md);
  }
  
  .peer-avatar svg {
    width: 28px;
    height: 28px;
  }
  
  .peer-name {
    font-size: var(--font-size-sm);
    font-weight: 600;
  }
  
  .peer-device {
    font-size: 11px;
    margin-top: 2px;
  }
  
  .peer-browser {
    font-size: 10px;
    margin-top: 2px;
  }
  
  /* 移动端 connection mode badge */
  .connection-mode-badge {
    width: 20px;
    height: 20px;
  }
  
  .connection-mode-badge .mode-icon {
    width: 10px;
    height: 10px;
  }

  /* 移动端 peer 操作按钮 - 更大触摸区域 */
  .peer-action-btn {
    opacity: 1;
    transform: scale(1);
    width: 36px;
    height: 36px;
    top: var(--space-sm);
    right: var(--space-sm);
    background: rgba(96, 165, 250, 0.15);
    border-color: rgba(96, 165, 250, 0.3);
  }
  
  .peer-action-btn svg {
    width: 16px;
    height: 16px;
  }
  
  .peer-action-btn:active {
    background: var(--accent-gradient);
    color: white;
    transform: scale(0.9);
  }
  
  /* Modal - 底部弹出 Sheet 样式 */
  .modal-content {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    margin: 0;
    width: 100%;
    max-width: 100%;
    max-height: 85vh;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    padding: var(--space-lg);
    padding-bottom: calc(var(--space-xl) + var(--safe-area-bottom));
    transform: translateY(100%);
    transition: transform 0.35s cubic-bezier(0.32, 0.72, 0, 1);
  }
  
  .modal.active .modal-content {
    transform: translateY(0);
  }
  
  /* Sheet 顶部拖拽指示器 */
  .modal-content::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 36px;
    height: 4px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 2px;
  }
  
  .modal-header {
    margin-top: var(--space-sm);
    margin-bottom: var(--space-lg);
  }
  
  .modal-title {
    font-size: var(--font-size-lg);
  }
  
  /* 按钮更大更易点击 */
  .btn {
    padding: var(--space-md) var(--space-lg);
    font-size: var(--font-size-base);
    min-height: 48px;
    border-radius: var(--radius-lg);
  }
  
  .receive-actions,
  .text-actions {
    flex-direction: column;
    gap: var(--space-sm);
  }
  
  .receive-actions .btn,
  .text-actions .btn {
    width: 100%;
  }
  
  /* 输入框更大 */
  .text-input,
  .room-input,
  .name-input {
    padding: var(--space-md);
    font-size: var(--font-size-base);
    min-height: 52px;
    border-radius: var(--radius-lg);
  }
  
  .text-input {
    min-height: 120px;
  }
  
  /* Toast 适配 - 底部显示 */
  .toast-container {
    top: auto;
    bottom: calc(80px + var(--safe-area-bottom));
    left: var(--space-md);
    right: var(--space-md);
  }
  
  .toast {
    max-width: 100%;
    padding: var(--space-md);
    border-radius: var(--radius-lg);
  }
  
  @keyframes slideInFromTop {
    from {
      opacity: 0;
      transform: translateY(20px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
  
  @keyframes slideOutToTop {
    to {
      opacity: 0;
      transform: translateY(20px);
    }
  }
  
  /* Chat Panel 全屏优化 */
  .chat-panel {
    width: 100vw;
    right: -100vw;
    padding-top: var(--safe-area-top);
  }
  
  .chat-panel.active {
    right: 0;
  }
  
  .chat-header {
    padding: var(--space-md);
    min-height: 56px;
  }
  
  .chat-title {
    font-size: var(--font-size-base);
  }
  
  .chat-messages {
    padding: var(--space-md);
    padding-bottom: var(--space-xl);
  }
  
  .chat-bubble {
    padding: var(--space-md);
    font-size: var(--font-size-sm);
    max-width: 85%;
  }
  
  /* Mobile: always show copy button */
  .chat-copy-btn {
    opacity: 0.6;
    transform: scale(1);
    width: 32px;
    height: 32px;
  }
  
  .chat-copy-btn svg {
    width: 16px;
    height: 16px;
  }
  
  .chat-copy-btn:active {
    opacity: 1;
    background: var(--bg-glass-hover);
  }
  
  .chat-input-container {
    padding: var(--space-md);
    padding-bottom: calc(var(--space-md) + var(--safe-area-bottom));
    gap: var(--space-sm);
  }
  
  .chat-input {
    padding: var(--space-md);
    font-size: 16px; /* 防止 iOS 缩放 */
    min-height: 48px;
    border-radius: var(--radius-lg);
  }
  
  .btn-send {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
  }
  
  /* Security Section 移动端优化 */
  .security-section {
    padding: var(--space-md);
    padding-bottom: calc(var(--space-lg) + 70px + var(--safe-area-bottom));
  }
  
  .security-header {
    flex-direction: column;
    gap: var(--space-xs);
  }
  
  .security-title {
    font-size: var(--font-size-base);
  }
  
  .security-grid {
    gap: var(--space-sm);
  }
  
  .security-card {
    padding: var(--space-xs) var(--space-sm);
  }
  
  .security-card-title {
    font-size: var(--font-size-xs);
  }
  
  .security-footer {
    gap: var(--space-sm);
  }
  
  .security-badge {
    font-size: 10px;
  }
  
  /* Drop zone 移动端 */
  .drop-zone-content {
    padding: var(--space-xl);
  }
  
  .drop-icon {
    width: 60px;
    height: 60px;
  }
  
  .drop-text {
    font-size: var(--font-size-base);
  }
}

/* Extra small screens (iPhone SE, etc.) */
@media (max-width: 380px) {
  .header {
    padding: var(--space-xs) var(--space-sm);
    padding-top: calc(var(--space-xs) + var(--safe-area-top));
  }
  
  .logo-icon {
    width: 28px;
    height: 28px;
  }
  
  .device-name-info,
  .room-info {
    padding: 3px 8px;
  }
  
  .device-name {
    max-width: 50px;
    font-size: 10px;
  }
  
  .room-code {
    font-size: 10px;
  }
  
  .peers-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
  }
  
  .peer-card {
    padding: var(--space-md) var(--space-sm);
    min-height: 120px;
  }
  
  .peer-avatar {
    width: 44px;
    height: 44px;
    margin-bottom: var(--space-sm);
  }
  
  .peer-avatar svg {
    width: 22px;
    height: 22px;
  }
  
  .peer-name {
    font-size: var(--font-size-xs);
  }
  
  .peer-action-btn {
    width: 32px;
    height: 32px;
  }
  
  .peer-action-btn svg {
    width: 14px;
    height: 14px;
  }
  
  .empty-icon {
    width: 80px;
    height: 80px;
  }
  
  .empty-title {
    font-size: var(--font-size-base);
  }
  
  .empty-description {
    font-size: var(--font-size-xs);
  }
}

/* Landscape mode on mobile */
@media (max-width: 896px) and (orientation: landscape) {
  .app {
    padding-bottom: calc(60px + var(--safe-area-bottom));
  }
  
  .main {
    padding-top: var(--space-md);
    min-height: auto;
  }
  
  .empty-icon {
    width: 60px;
    height: 60px;
  }
  
  .peers-grid {
    grid-template-columns: repeat(auto-fit, minmax(120px, 140px));
  }
  
  .peer-card {
    min-height: 100px;
    padding: var(--space-sm);
  }
  
  .peer-avatar {
    width: 36px;
    height: 36px;
    margin-bottom: var(--space-xs);
  }
  
  .security-section {
    display: none; /* 横屏时隐藏安全区块 */
  }
  
  /* Bottom bar in landscape */
  .mobile-bottom-bar {
    height: 50px;
  }
}

/* ============================================
   Animation Utilities
   ============================================ */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.animate-spin {
  animation: spin 1s linear infinite;
}

/* ============================================
   Scrollbar Styling
   ============================================ */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-glass);
}

::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* ============================================
   Selection Colors
   ============================================ */
::selection {
  background: var(--accent-primary);
  color: white;
}

/* ============================================
   Security Section (Compact)
   ============================================ */
.security-section {
  width: 100%;
  padding: var(--space-lg) var(--space-xl);
  background: linear-gradient(180deg, transparent 0%, rgba(96, 165, 250, 0.02) 50%, transparent 100%);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.security-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.security-icon {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.security-icon svg {
  width: 100%;
  height: 100%;
}

.security-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin: 0;
}

.security-subtitle {
  display: none;
}

.security-grid {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-md);
  max-width: 1000px;
  margin: 0 auto var(--space-lg);
}

.security-card {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-full);
  transition: all var(--transition-normal);
}

.security-card::before {
  display: none;
}

.security-card:hover {
  border-color: rgba(96, 165, 250, 0.3);
  box-shadow: 0 4px 20px rgba(96, 165, 250, 0.1);
}

/* Tooltip */
.security-card[data-tooltip] {
  position: relative;
}

.security-card[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%) translateY(5px);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  white-space: normal;
  width: 240px;
  text-align: center;
  line-height: 1.5;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
  pointer-events: none;
  z-index: 100;
  box-shadow: var(--shadow-lg);
}

.security-card[data-tooltip]::before {
  content: '';
  position: absolute;
  bottom: calc(100% + 4px);
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: var(--bg-secondary);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
  z-index: 101;
}

.security-card[data-tooltip]:hover::after,
.security-card[data-tooltip]:hover::before {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.security-card-icon {
  width: 24px;
  height: 24px;
  padding: 4px;
  background: var(--accent-gradient);
  border-radius: var(--radius-sm);
  color: white;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.security-card-icon svg {
  width: 100%;
  height: 100%;
}

.security-card-title {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
}

.security-card-desc {
  display: none;
}

.security-footer {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-lg);
}

.security-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  background: transparent;
  border: none;
  font-size: var(--font-size-xs);
  color: var(--status-success);
  opacity: 0.8;
  margin: 0;
  flex: 0 0 auto;
}

.security-badge:hover {
  opacity: 1;
}

.security-badge svg {
  width: 12px;
  height: 12px;
}

/* Security Section Responsive */
@media (max-width: 640px) {
  .security-section {
    padding: var(--space-md);
  }
  
  .security-header {
    flex-direction: column;
    gap: var(--space-xs);
  }
  
  .security-grid {
    gap: var(--space-sm);
  }
  
  .security-card {
    padding: var(--space-xs) var(--space-sm);
  }
  
  .security-footer {
    gap: var(--space-sm);
  }
}

/* Chat Panel */
.chat-panel {
  position: fixed;
  top: 0;
  right: -400px;
  width: 400px;
  height: 100vh;
  background: var(--bg-secondary);
  border-left: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  flex-direction: column;
  transition: right var(--transition-slow);
  z-index: 2500;
  box-shadow: -10px 0 30px rgba(0, 0, 0, 0.5);
}

.chat-panel.active { right: 0; }

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  background: var(--bg-glass);
}

.chat-title { font-size: var(--font-size-lg); font-weight: 600; color: var(--text-primary); margin: 0; }

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.chat-message { display: flex; flex-direction: column; max-width: 75%;  }
.chat-message.sent { align-self: flex-end; }
.chat-message.received { align-self: flex-start; }

.chat-bubble-wrapper {
  display: flex;
  align-items: flex-start;
  gap: var(--space-xs);
}

.chat-message.sent .chat-bubble-wrapper {
  flex-direction: row-reverse;
}

.chat-bubble { 
  padding: var(--space-sm) var(--space-md); 
  border-radius: var(--radius-lg); 
  word-wrap: break-word;
  min-width: 0;
  flex: 0 1 auto;
}
.chat-message.sent .chat-bubble { background: var(--accent-gradient); color: white; }
.chat-message.received .chat-bubble { background: var(--bg-glass); color: var(--text-primary); }

/* Copy button */
.chat-copy-btn {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-glass);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  opacity: 0;
  transform: scale(0.9);
  transition: all var(--transition-fast);
}

.chat-copy-btn svg {
  width: 14px;
  height: 14px;
}

/* Desktop: show on hover */
.chat-message:hover .chat-copy-btn {
  opacity: 1;
  transform: scale(1);
}

.chat-copy-btn:hover {
  background: var(--bg-glass-hover);
  color: var(--text-primary);
  border-color: rgba(96, 165, 250, 0.3);
}

.chat-copy-btn:active {
  transform: scale(0.95) !important;
}

/* Copied state */
.chat-copy-btn.copied {
  background: rgba(52, 211, 153, 0.2);
  color: var(--status-success);
  border-color: rgba(52, 211, 153, 0.4);
  opacity: 1;
  transform: scale(1);
}

.chat-copy-btn.copied svg {
  animation: copySuccess 0.3s ease;
}

@keyframes copySuccess {
  0% { transform: scale(1); }
  50% { transform: scale(1.2); }
  100% { transform: scale(1); }
}

.chat-time { font-size: 11px; color: var(--text-muted); margin-top: var(--space-xs); }

.chat-input-container {
  display: flex;
  gap: var(--space-sm);
  padding: var(--space-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  background: var(--bg-glass);
}

.chat-input {
  flex: 1;
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-glass);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
}

.chat-input:focus { outline: none; border-color: var(--accent-primary); }

.btn-send { background: var(--accent-gradient); color: white; border-radius: 50%; width: 40px; height: 40px; }
.btn-send:disabled { opacity: 0.6; cursor: not-allowed; }
.btn-send.sending { animation: pulse 1s ease-in-out infinite; }

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.7; transform: scale(0.95); }
}

.peer-action-history { right: calc(var(--space-sm) + 32px); }

/* Message sending states */
.chat-message.sending .chat-bubble { opacity: 0.7; }
.chat-message.sending .chat-time { color: var(--accent-primary); }
.chat-message.failed .chat-bubble { background: var(--status-error); opacity: 0.8; }
.chat-message.failed .chat-time { color: var(--status-error); cursor: pointer; }
.chat-message.failed .chat-time:hover { text-decoration: underline; }

/* Input disabled state */
.chat-input:disabled { opacity: 0.6; cursor: not-allowed; }

/* ============================================
   Chat Image Support
   ============================================ */
.btn-attach {
  width: 40px;
  height: 40px;
  background: var(--bg-glass);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.btn-attach:hover {
  background: var(--bg-glass-hover);
  color: var(--accent-primary);
  border-color: rgba(96, 165, 250, 0.3);
}

.btn-attach:active {
  transform: scale(0.95);
}

.btn-attach svg {
  width: 20px;
  height: 20px;
}

/* Image Preview Area */
.chat-image-preview {
  padding: var(--space-md);
  background: var(--bg-glass);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.preview-image-container {
  position: relative;
  display: inline-block;
  max-width: 200px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.preview-image-container img {
  display: block;
  max-width: 100%;
  max-height: 150px;
  object-fit: contain;
  background: var(--bg-secondary);
}

.preview-remove-btn {
  position: absolute;
  top: var(--space-xs);
  right: var(--space-xs);
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.7);
  border: none;
  border-radius: 50%;
  color: white;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.preview-remove-btn:hover {
  background: var(--status-error);
  transform: scale(1.1);
}

.preview-remove-btn svg {
  width: 14px;
  height: 14px;
}

/* Chat Message Image */
.chat-bubble-image {
  padding: var(--space-xs);
  background: transparent;
}

.chat-bubble-image img {
  display: block;
  max-width: 100%;
  max-height: 300px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.chat-bubble-image img:hover {
  transform: scale(1.02);
}

.chat-message.sent .chat-bubble-image {
  background: transparent;
}

.chat-message.received .chat-bubble-image {
  background: transparent;
}

/* Image Loading State */
.chat-bubble-image.loading {
  min-width: 100px;
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-glass);
  border-radius: var(--radius-md);
}

.chat-bubble-image.loading::after {
  content: '';
  width: 24px;
  height: 24px;
  border: 2px solid var(--text-muted);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* Image Fullscreen Modal */
.image-fullscreen-modal {
  position: fixed;
  inset: 0;
  z-index: 3000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.95);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.image-fullscreen-modal.active {
  opacity: 1;
  visibility: visible;
}

.image-fullscreen-modal img {
  max-width: 95vw;
  max-height: 95vh;
  object-fit: contain;
  border-radius: var(--radius-md);
}

.image-fullscreen-close {
  position: absolute;
  top: var(--space-lg);
  right: var(--space-lg);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  border-radius: 50%;
  color: white;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.image-fullscreen-close:hover {
  background: rgba(255, 255, 255, 0.2);
}

.image-fullscreen-close svg {
  width: 24px;
  height: 24px;
}

/* Mobile optimizations for chat images */
@media (max-width: 640px) {
  .btn-attach {
    width: 44px;
    height: 44px;
  }

  .chat-bubble-image img {
    max-height: 200px;
  }

  .preview-image-container {
    max-width: 160px;
  }

  .preview-image-container img {
    max-height: 120px;
  }
}

/* ============================================
   Desktop Share Popover
   ============================================ */
.share-popover {
  position: fixed;
  top: 70px;
  right: var(--space-xl);
  width: 320px;
  background: var(--bg-secondary);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg), 0 0 40px rgba(0, 0, 0, 0.3);
  z-index: 1500;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px) scale(0.95);
  transition: all var(--transition-normal);
}

.share-popover.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.share-popover-arrow {
  position: absolute;
  top: -8px;
  right: 80px;
  width: 16px;
  height: 16px;
  background: var(--bg-secondary);
  border-left: 1px solid rgba(255, 255, 255, 0.1);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  transform: rotate(45deg);
}

.share-popover-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.share-popover-title {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.share-popover-close {
  width: 28px;
  height: 28px;
  background: var(--bg-glass);
  border-radius: var(--radius-sm);
}

.share-popover-body {
  padding: var(--space-lg);
}

.share-qr-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-lg);
  background: white;
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-lg);
}

.share-qr-container canvas {
  display: block;
}

.share-qr-hint {
  margin-top: var(--space-sm);
  font-size: var(--font-size-xs);
  color: #666;
}

.share-room-code-display {
  text-align: center;
  margin-bottom: var(--space-lg);
}

.share-room-code-label {
  display: block;
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-xs);
}

.share-room-code-value {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: var(--font-size-2xl);
  font-weight: 700;
  letter-spacing: 0.15em;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.share-popover-actions {
  display: flex;
  gap: var(--space-sm);
}

.share-action-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-glass);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.share-action-btn:hover {
  background: var(--bg-glass-hover);
  color: var(--text-primary);
  border-color: rgba(96, 165, 250, 0.3);
}

.share-action-btn:active {
  transform: scale(0.98);
}

.share-action-btn svg {
  width: 16px;
  height: 16px;
}

/* Copy success feedback */
.share-action-btn.copied {
  background: rgba(52, 211, 153, 0.2);
  border-color: rgba(52, 211, 153, 0.4);
  color: var(--status-success);
}

/* Click outside overlay for share popover */
.share-popover-overlay {
  position: fixed;
  inset: 0;
  z-index: 1499;
  display: none;
}

.share-popover-overlay.active {
  display: block;
}

/* Hide desktop share popover and overlay on mobile */
@media (max-width: 640px) {
  .share-popover,
  .share-popover-overlay {
    display: none !important;
  }
}

/* ============================================
   Mobile Bottom Navigation Bar
   ============================================ */
.mobile-bottom-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 70px;
  padding-bottom: var(--safe-area-bottom);
  background: var(--bg-secondary);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(20px);
  z-index: 1000;
}

.mobile-bottom-bar-inner {
  display: flex;
  align-items: center;
  justify-content: space-around;
  height: 100%;
  max-width: 400px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.mobile-nav-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: var(--space-sm) var(--space-md);
  background: transparent;
  border: none;
  border-radius: var(--radius-lg);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-width: 64px;
  -webkit-tap-highlight-color: transparent;
}

.mobile-nav-btn:active {
  transform: scale(0.92);
  background: var(--bg-glass);
}

.mobile-nav-btn.active {
  color: var(--accent-primary);
}

.mobile-nav-btn svg {
  width: 24px;
  height: 24px;
  stroke-width: 1.5;
}

.mobile-nav-label {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

/* Primary action button in center */
.mobile-nav-btn.primary {
  width: 56px;
  height: 56px;
  min-width: 56px;
  padding: 0;
  margin-top: -20px;
  background: var(--accent-gradient);
  border-radius: 50%;
  color: white;
  box-shadow: 0 4px 20px rgba(96, 165, 250, 0.4);
  flex-direction: row;
  gap: 0;
}

.mobile-nav-btn.primary:active {
  transform: scale(0.9);
  box-shadow: 0 2px 10px rgba(96, 165, 250, 0.3);
}

.mobile-nav-btn.primary svg {
  width: 28px;
  height: 28px;
  stroke-width: 2;
}

.mobile-nav-btn.primary .mobile-nav-label {
  display: none;
}

/* Peer count badge */
.peer-count-badge {
  position: absolute;
  top: -2px;
  right: -2px;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  background: var(--status-success);
  color: white;
  font-size: 11px;
  font-weight: 600;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mobile-nav-btn .peer-count-badge {
  position: static;
  margin-left: 4px;
  transform: translateY(-8px);
}

@media (max-width: 640px) {
  .mobile-bottom-bar {
    display: block;
  }
}

@media (max-width: 896px) and (orientation: landscape) {
  .mobile-bottom-bar {
    height: 50px;
  }
  
  .mobile-nav-btn {
    padding: var(--space-xs) var(--space-sm);
    min-width: 48px;
  }
  
  .mobile-nav-btn svg {
    width: 20px;
    height: 20px;
  }
  
  .mobile-nav-label {
    display: none;
  }
  
  .mobile-nav-btn.primary {
    width: 44px;
    height: 44px;
    min-width: 44px;
    margin-top: -12px;
  }
  
  .mobile-nav-btn.primary svg {
    width: 22px;
    height: 22px;
  }
}

/* ============================================
   Mobile Quick Actions (Peer selection mode)
   ============================================ */
.mobile-quick-actions {
  position: fixed;
  bottom: calc(70px + var(--safe-area-bottom));
  left: var(--space-md);
  right: var(--space-md);
  display: none;
  flex-direction: column;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  animation: slideUpFade 0.3s ease;
  z-index: 999;
}

.mobile-quick-actions.active {
  display: flex;
}

@keyframes slideUpFade {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.quick-action-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.quick-action-title {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-secondary);
}

.quick-action-close {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-glass);
  border: none;
  border-radius: 50%;
  color: var(--text-muted);
  cursor: pointer;
}

.quick-action-close svg {
  width: 14px;
  height: 14px;
}

.quick-action-btn {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--bg-glass);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.quick-action-btn:active {
  transform: scale(0.98);
  background: var(--bg-glass-hover);
}

.quick-action-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-gradient);
  border-radius: var(--radius-md);
  color: white;
  flex-shrink: 0;
}

.quick-action-icon svg {
  width: 20px;
  height: 20px;
}

.quick-action-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
}

.quick-action-name {
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--text-primary);
}

.quick-action-desc {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

/* ============================================
   Empty State Enhancement (Mobile)
   ============================================ */
.empty-state-actions {
  display: none;
  flex-direction: column;
  gap: var(--space-sm);
  margin-top: var(--space-xl);
  width: 100%;
  max-width: 280px;
}

@media (max-width: 640px) {
  .empty-state-actions {
    display: flex;
  }
}

.empty-action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-glass);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.empty-action-btn:active {
  transform: scale(0.98);
  background: var(--bg-glass-hover);
  border-color: rgba(96, 165, 250, 0.3);
}

.empty-action-btn.primary {
  background: var(--accent-gradient);
  color: white;
  border: none;
}

.empty-action-btn.primary:active {
  box-shadow: 0 0 20px var(--accent-glow);
}

.empty-action-btn svg {
  width: 18px;
  height: 18px;
}

/* Quick Join Section - Gradient Border Style */
.quick-join-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
  margin-top: var(--space-2xl);
  width: 100%;
}

.quick-join-label {
  color: var(--text-muted);
  font-size: var(--font-size-sm);
}

/* Gradient border container */
.quick-join-code-container {
  position: relative;
  padding: 2px;
  background: var(--accent-gradient);
  border-radius: 16px;
  box-shadow: 0 0 30px rgba(96, 165, 250, 0.15), 0 0 60px rgba(167, 139, 250, 0.1);
  transition: box-shadow var(--transition-normal);
}

.quick-join-code-container:focus-within {
  box-shadow: 0 0 40px rgba(96, 165, 250, 0.25), 0 0 80px rgba(167, 139, 250, 0.15);
}

/* Inner container */
.quick-join-code-inputs {
  display: flex;
  align-items: center;
  background: var(--bg-primary);
  border-radius: 14px;
  padding: 5px 10px;
  gap: 0;
}

/* Separator between digits */
.code-separator {
  width: 1px;
  height: 20px;
  background: linear-gradient(180deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  margin: 0 2px;
}

/* Individual digit input */
.code-digit {
  width: 34px;
  height: 42px;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: 'SF Mono', 'Monaco', 'Inconsolata', monospace;
  font-size: 1.2rem;
  font-weight: 600;
  text-align: center;
  text-transform: uppercase;
  caret-color: var(--accent-primary);
  transition: all var(--transition-fast);
  border-radius: var(--radius-sm);
}

.code-digit:focus {
  outline: none;
  background: rgba(96, 165, 250, 0.1);
}

.code-digit.filled {
  color: var(--accent-primary);
  text-shadow: 0 0 10px rgba(96, 165, 250, 0.5);
}

.code-digit::placeholder {
  color: var(--text-muted);
  opacity: 0.2;
}

/* Mobile responsive */
@media (max-width: 480px) {
  .code-digit {
    width: 38px;
    height: 48px;
    font-size: 1.25rem;
  }

  .quick-join-code-inputs {
    padding: 5px 10px;
  }

  .code-separator {
    height: 24px;
  }
}

/* ============================================
   Pull to Refresh Indicator (Visual hint)
   ============================================ */
.pull-indicator {
  position: fixed;
  top: calc(56px + var(--safe-area-top));
  left: 50%;
  transform: translateX(-50%) translateY(-60px);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--bg-secondary);
  border-radius: 50%;
  box-shadow: var(--shadow-md);
  opacity: 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
  z-index: 50;
  pointer-events: none;
}

.pull-indicator svg {
  width: 20px;
  height: 20px;
  color: var(--accent-primary);
}

.pull-indicator.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(10px);
}

.pull-indicator.refreshing svg {
  animation: spin 1s linear infinite;
}

/* ============================================
   Chat Empty State
   ============================================ */
.chat-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xl);
  text-align: center;
  height: 100%;
}

.chat-empty-icon {
  font-size: 48px;
  margin-bottom: var(--space-md);
  opacity: 0.5;
}

.chat-empty-text {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}

.chat-empty-hint {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* ============================================
   Haptic Feedback Classes
   ============================================ */
.haptic-light {
  /* Used with JS for light haptic feedback */
}

.haptic-medium {
  /* Used with JS for medium haptic feedback */
}

.haptic-heavy {
  /* Used with JS for heavy haptic feedback */
}

/* ============================================
   Improved Touch Scrolling
   ============================================ */
.peers-grid,
.chat-messages,
.modal-body {
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}

/* ============================================
   Mobile File Input Hidden Label
   ============================================ */
.file-input-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================
   Mobile Settings Panel
   ============================================ */
.settings-section {
  padding: var(--space-md) 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.settings-section:last-child {
  border-bottom: none;
}

.settings-label {
  display: block;
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}

.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.settings-value {
  font-size: var(--font-size-base);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.settings-value .status-dot {
  width: 8px;
  height: 8px;
}

.settings-room {
  font-family: monospace;
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--accent-primary);
  letter-spacing: 0.1em;
}

.btn-sm {
  padding: var(--space-xs) var(--space-md);
  font-size: var(--font-size-xs);
  min-height: auto;
}

/* Settings hint text */
.settings-hint {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
}

/* Trusted devices list in settings */
.trusted-devices-list {
  max-height: 200px;
  overflow-y: auto;
}

.trusted-empty {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  text-align: center;
  padding: var(--space-md);
}

.trusted-device-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-glass);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-xs);
}

.trusted-device-info {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  min-width: 0;
  flex: 1;
}

.trusted-device-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-gradient);
  border-radius: 50%;
  color: white;
  flex-shrink: 0;
}

.trusted-device-icon svg {
  width: 16px;
  height: 16px;
}

.trusted-device-details {
  min-width: 0;
}

.trusted-device-name {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.trusted-device-meta {
  font-size: 11px;
  color: var(--text-muted);
}

.btn-untrust {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(248, 113, 113, 0.1);
  border: 1px solid rgba(248, 113, 113, 0.3);
  border-radius: var(--radius-sm);
  color: var(--status-error);
  cursor: pointer;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.btn-untrust:hover {
  background: rgba(248, 113, 113, 0.2);
  border-color: rgba(248, 113, 113, 0.5);
}

.btn-untrust svg {
  width: 14px;
  height: 14px;
}

/* ============================================
   Mobile Share Panel
   ============================================ */
.share-body {
  text-align: center;
}

.share-room-display {
  padding: var(--space-xl);
  background: var(--bg-glass);
  border: 2px dashed rgba(96, 165, 250, 0.3);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-lg);
}

.share-room-code {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.share-hint {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin-bottom: var(--space-xl);
}

.share-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.share-actions .btn {
  width: 100%;
  justify-content: center;
}

.share-actions .btn svg {
  width: 18px;
  height: 18px;
}

/* Mobile QR Code Container */
.share-qr-container.mobile-qr {
  padding: var(--space-lg);
  background: white;
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.share-qr-container.mobile-qr canvas {
  display: block;
  border-radius: var(--radius-sm);
}

.share-qr-container.mobile-qr .share-qr-hint {
  margin-top: var(--space-sm);
  font-size: var(--font-size-xs);
  color: #666;
}

/* ============================================
   Additional Mobile Enhancements
   ============================================ */

/* Improved button states */
@media (hover: none) {
  .btn:active,
  .peer-card:active,
  .mobile-nav-btn:active {
    transform: scale(0.96);
  }
  
  .btn-primary:active {
    box-shadow: 0 0 30px var(--accent-glow);
  }
}

/* Better visual hierarchy for peer cards on mobile */
@media (max-width: 640px) {
  .peer-card {
    position: relative;
    overflow: visible;
  }
  
  /* Subtle gradient border effect on hover/active */
  .peer-card::after {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: var(--radius-xl);
    padding: 1px;
    background: linear-gradient(135deg, transparent 0%, rgba(96, 165, 250, 0.3) 100%);
    -webkit-mask: 
      linear-gradient(#fff 0 0) content-box, 
      linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity var(--transition-normal);
    pointer-events: none;
  }
  
  .peer-card:active::after {
    opacity: 1;
  }
}

/* Vibration feedback class (used with JS) */
.vibrate {
  animation: vibrate 0.1s ease;
}

@keyframes vibrate {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-2px); }
  75% { transform: translateX(2px); }
}

/* Loading skeleton for peer cards */
.peer-card-skeleton {
  background: var(--bg-glass);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}

@keyframes skeleton-pulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 0.8; }
}

.skeleton-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  margin: 0 auto var(--space-md);
}

.skeleton-text {
  height: 14px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  margin: var(--space-xs) auto;
}

.skeleton-text.short {
  width: 60%;
}

.skeleton-text.long {
  width: 80%;
}

/* Better focus states for accessibility */
.btn:focus-visible,
.peer-card:focus-visible,
.mobile-nav-btn:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

/* Prevent text selection on interactive elements */
.btn,
.peer-card,
.mobile-nav-btn,
.quick-action-btn {
  -webkit-user-select: none;
  user-select: none;
}

/* iOS input zoom prevention */
@media (max-width: 640px) {
  input[type="text"],
  textarea {
    font-size: 16px !important; /* Prevents iOS zoom */
  }
}

/* Smooth page transitions */
.app {
  transition: opacity 0.3s ease;
}

.app.transitioning {
  opacity: 0.7;
  pointer-events: none;
}

/* Connection status improvements for mobile */
@media (max-width: 640px) {
  .connection-status.connected {
    background: rgba(52, 211, 153, 0.15);
  }
  
  .connection-status.disconnected {
    background: rgba(248, 113, 113, 0.15);
  }
}

/* Improved modal backdrop touch handling */
.modal-backdrop {
  -webkit-tap-highlight-color: transparent;
}

/* Better scroll behavior */
html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  html {
    scroll-behavior: auto;
  }
}

/* ============================================
   Virtual Keyboard Handling (Mobile)
   ============================================ */
/* When virtual keyboard is visible, hide bottom bar and adjust layout */
@media (max-width: 640px) {
  .keyboard-visible .mobile-bottom-bar {
    display: none !important;
  }
  
  .keyboard-visible .app {
    padding-bottom: 0;
  }
  
  .keyboard-visible .chat-input-container {
    padding-bottom: var(--space-md);
    position: sticky;
    bottom: 0;
    background: var(--bg-secondary);
  }
  
  .keyboard-visible .modal-content {
    max-height: 50vh;
  }
  
  /* Ensure input stays visible when keyboard shows */
  .keyboard-visible .chat-panel {
    height: 100%;
  }
}

/* PWA standalone mode adjustments */
@media all and (display-mode: standalone) {
  .header {
    padding-top: calc(var(--space-md) + var(--safe-area-top));
  }
  
  .app {
    min-height: 100vh;
    min-height: -webkit-fill-available;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --bg-glass: rgba(255, 255, 255, 0.15);
    --text-secondary: #b0b0b0;
  }
  
  .peer-card,
  .modal-content,
  .toast {
    border-width: 2px;
  }
}

/* Dark mode media query (already dark, but ensure consistency) */
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
  }
}

/* ============================================
   Secure Room UI Styles
   ============================================ */

/* Room Lock Icon */
.room-lock-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  margin-right: var(--space-xs);
  padding: 4px;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.room-lock-icon:hover {
  background: var(--bg-glass);
  color: var(--text-secondary);
}

.room-lock-icon svg {
  width: 14px;
  height: 14px;
}

/* Default: show unlocked, hide locked */
.room-lock-icon .lock-open {
  display: block;
}

.room-lock-icon .lock-closed {
  display: none;
}

/* Secure room: hide unlocked, show locked with green color */
.room-lock-icon.locked {
  color: var(--status-success);
}

.room-lock-icon.locked .lock-open {
  display: none;
}

.room-lock-icon.locked .lock-closed {
  display: block;
  animation: lockPulse 2s ease-in-out infinite;
}

@keyframes lockPulse {
  0%, 100% { filter: drop-shadow(0 0 0 rgba(52, 211, 153, 0)); }
  50% { filter: drop-shadow(0 0 4px rgba(52, 211, 153, 0.6)); }
}

/* Password Strength Indicator */
.password-strength {
  display: none;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
}

.password-strength-bar {
  flex: 1;
  height: 4px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
  overflow: hidden;
}

.password-strength-fill {
  height: 100%;
  width: 0;
  background: var(--status-error);
  border-radius: 2px;
  transition: all var(--transition-normal);
}

.password-strength-text {
  font-size: var(--font-size-xs);
  font-weight: 500;
  min-width: 32px;
  text-align: right;
  color: var(--status-error);
  transition: color var(--transition-normal);
}

/* Password Input Wrapper */
.password-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.password-input-wrapper .room-input {
  padding-right: 48px;
  margin-bottom: 0;
}

.password-toggle {
  position: absolute;
  right: 8px;
  width: 32px;
  height: 32px;
  background: var(--bg-glass);
  border-radius: var(--radius-sm);
}

.password-toggle:hover {
  background: var(--bg-glass-hover);
}

.password-toggle svg {
  width: 18px;
  height: 18px;
}

/* Password toggle eye closed state */
.password-toggle.hidden svg path:last-child {
  opacity: 0;
}

/* Password Hint */
.password-hint {
  display: flex;
  align-items: center;
  margin-top: var(--space-sm);
  font-size: var(--font-size-xs);
  color: var(--status-warning);
  background: rgba(251, 191, 36, 0.1);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  border: 1px solid rgba(251, 191, 36, 0.2);
}

/* Form Group */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.form-group .room-input {
  margin-bottom: 0;
}

/* Secure Room Icon in Modal */
.secure-room-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(96, 165, 250, 0.15) 0%, rgba(167, 139, 250, 0.15) 100%);
  border-radius: 50%;
  animation: secureIconFloat 3s ease-in-out infinite;
}

.secure-room-icon svg {
  width: 32px;
  height: 32px;
}

@keyframes secureIconFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

/* Security Features List */
.security-features-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  padding: var(--space-md);
  background: rgba(52, 211, 153, 0.05);
  border: 1px solid rgba(52, 211, 153, 0.15);
  border-radius: var(--radius-lg);
}

.security-feature-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  color: var(--status-success);
}

.security-feature-item svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* Create Secure Room Button Enhancement */
#createSecureRoomConfirm {
  background: linear-gradient(135deg, var(--status-success) 0%, #059669 100%);
}

#createSecureRoomConfirm:hover {
  box-shadow: 0 0 30px rgba(52, 211, 153, 0.4);
}

/* Fade Slide Down Animation */
@keyframes fadeSlideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Mobile Adjustments for Secure Room Modal */
@media (max-width: 640px) {
  .secure-room-icon {
    width: 56px;
    height: 56px;
    margin-bottom: var(--space-md);
  }

  .secure-room-icon svg {
    width: 28px;
    height: 28px;
  }

  .security-features-list {
    padding: var(--space-sm) var(--space-md);
  }

  .security-feature-item {
    font-size: var(--font-size-xs);
  }

  .password-strength {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-xs);
  }

  .password-strength-text {
    text-align: left;
    margin-top: 2px;
  }
}

/* ============================================
   Language Switcher Styles
   ============================================ */
.language-switcher {
  position: relative;
  display: inline-flex;
  align-items: center;
  margin-left: var(--space-lg); /* Push right to group with GitHub icon */
}

.language-btn {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  transition: transform 0.2s ease;
}

.language-btn:hover {
  transform: scale(1.1);
}

.language-btn:active {
  transform: scale(1.05);
}

/* Flag styling - elegant floating design */
.language-btn .current-language-flag {
  width: 22px;
  height: 15px;
  flex-shrink: 0;
  border-radius: 3px;
  box-shadow:
    0 2px 6px rgba(0, 0, 0, 0.35),
    0 0 0 1px rgba(255, 255, 255, 0.1);
  transition: box-shadow 0.25s ease;
}

.language-btn:hover .current-language-flag {
  box-shadow:
    0 4px 12px rgba(0, 0, 0, 0.4),
    0 0 0 1px rgba(255, 255, 255, 0.15),
    0 0 16px rgba(96, 165, 250, 0.25);
}

/* Ensure flag SVG elements keep their colors */
.language-btn .current-language-flag rect,
.language-btn .current-language-flag polygon,
.language-btn .current-language-flag circle {
  stroke: none;
}

.language-btn .language-code {
  display: none;
}

.language-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  min-width: 165px;
  background: var(--bg-secondary);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.5),
              0 4px 12px rgba(96, 165, 250, 0.1);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px) scale(0.95);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 1000;
  overflow: hidden;
  backdrop-filter: blur(16px);
}

.language-menu::before {
  content: '';
  position: absolute;
  top: -6px;
  right: 16px;
  width: 12px;
  height: 12px;
  background: var(--bg-secondary);
  border-left: 1px solid rgba(255, 255, 255, 0.1);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  transform: rotate(45deg);
}

.language-switcher:hover .language-menu,
.language-menu:hover,
.language-menu.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.language-menu-item {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

.language-menu-item:hover {
  background: linear-gradient(90deg, rgba(96, 165, 250, 0.1) 0%, rgba(167, 139, 250, 0.08) 100%);
  color: var(--text-primary);
}

.language-menu-item.active {
  color: var(--primary);
  font-weight: 600;
  background: linear-gradient(90deg, rgba(96, 165, 250, 0.15) 0%, rgba(167, 139, 250, 0.1) 100%);
}

.language-flag {
  width: 22px;
  height: 15px;
  flex-shrink: 0;
  border-radius: 2px;
  overflow: hidden;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.language-name {
  flex: 1;
}

.language-menu-item .language-check {
  width: 16px;
  height: 16px;
  opacity: 0;
  transition: all 0.2s ease;
  color: var(--primary);
  transform: scale(0.8);
}

.language-menu-item.active .language-check {
  opacity: 1;
  transform: scale(1);
}

.language-menu-item + .language-menu-item {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

/* Mobile Language Switcher */
@media (max-width: 768px) {
  .language-switcher {
    order: 10; /* Move to end on mobile */
  }

  .language-btn .current-language-flag {
    width: 20px;
    height: 14px;
  }

  .language-menu {
    right: 0;
    left: auto;
    transform: translateY(-10px) scale(0.95);
    min-width: 150px;
    max-width: calc(100vw - 20px);
  }

  .language-menu::before {
    right: 16px;
    left: auto;
    margin-left: 0;
  }

  .language-switcher:hover .language-menu,
  .language-menu:hover,
  .language-menu.show {
    transform: translateY(0) scale(1);
  }

  .language-flag {
    font-size: 16px;
  }

  .language-menu-item {
    padding: 10px 14px;
    gap: 8px;
  }
}

/* Header Right Adjustments for Language Switcher */
.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

@media (max-width: 768px) {
  .header-right {
    gap: var(--space-sm);
  }
}