/* ==========================================================================
   Chit-Chat — Mentimeter-Inspired Design System
   Clean, minimal, consistent light theme with SVG icons/avatars
   ========================================================================== */

/* Import Poppins - rounded, modern font similar to Product Sans */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&display=swap');

:root {
  /* Primary accent - Mentimeter purple/blue */
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: #818cf8;
  --primary-soft: rgba(99, 102, 241, 0.08);
  --primary-glow: rgba(99, 102, 241, 0.12);
  
  /* Consistent light theme neutrals */
  --bg-base: #ffffff;
  --bg-elevated: #ffffff;
  --bg-subtle: #f8fafc;
  --bg-muted: #f1f5f9;
  --bg-hover: #e2e8f0;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-inverse: #ffffff;
  
  --border-light: #e2e8f0;
  --border-default: #cbd5e1;
  
  /* Status colors - muted versions */
  --success: #22c55e;
  --success-soft: rgba(34, 197, 94, 0.1);
  --warning: #f59e0b;
  --warning-soft: rgba(245, 158, 11, 0.1);
  --error: #ef4444;
  --error-soft: rgba(239, 68, 68, 0.1);
  --info: #3b82f6;
  --info-soft: rgba(59, 130, 246, 0.1);
  
  /* Shadows - soft and subtle */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 6px rgba(15, 23, 42, 0.05), 0 2px 4px rgba(15, 23, 42, 0.03);
  --shadow-lg: 0 10px 15px rgba(15, 23, 42, 0.06), 0 4px 6px rgba(15, 23, 42, 0.04);
  --shadow-xl: 0 20px 25px rgba(15, 23, 42, 0.08), 0 8px 10px rgba(15, 23, 42, 0.04);
  
  /* Border radius - rounded/curved */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-2xl: 28px;
  --radius-full: 9999px;
  
  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --duration-fast: 150ms;
  --duration-normal: 200ms;
  --duration-slow: 300ms;
  
  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
}

/* ==========================================================================
   Base Styles
   ========================================================================== */

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

html, body {
  height: 100%;
  font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

#app {
  height: 100%;
  overflow: hidden;
  background: var(--bg-base);
}

/* SVG Icons base styling */
svg {
  flex-shrink: 0;
  display: inline-block;
  vertical-align: middle;
}

/* ==========================================================================
   Avatar System - High Quality SVG Avatars
   ========================================================================== */

.avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--bg-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border: 2px solid var(--border-light);
  flex-shrink: 0;
}

.avatar svg {
  width: 100%;
  height: 100%;
}

.avatar.size-sm {
  width: 24px;
  height: 24px;
  border-width: 1px;
}

.avatar.size-md {
  width: 36px;
  height: 36px;
}

.avatar.size-lg {
  width: 56px;
  height: 56px;
}

.avatar.size-xl {
  width: 72px;
  height: 72px;
  border-width: 3px;
}

/* ==========================================================================
   Screen Management
   ========================================================================== */

.screen {
  display: none;
  height: 100%;
  overflow-y: auto;
  animation: screenFadeIn var(--duration-slow) var(--ease-out);
  background: var(--bg-base);
}

.screen.active {
  display: flex;
  flex-direction: column;
}

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

/* ==========================================================================
   Loading Screen
   ========================================================================== */

#loading {
  justify-content: center;
  align-items: center;
  background: var(--bg-base);
}

.loading-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
  color: var(--text-primary);
}

.loading-content p {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.loading-spinner {
  width: 48px;
  height: 48px;
  color: var(--primary);
}

.loading-spinner svg {
  width: 100%;
  height: 100%;
  animation: spin 1s linear infinite;
}

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

/* ==========================================================================
   Home Screen
   ========================================================================== */

#home {
  background: var(--bg-base);
  justify-content: center;
  align-items: center;
  padding: var(--space-xl);
}

.home-container {
  text-align: center;
  max-width: 420px;
  width: 100%;
}

.logo {
  margin-bottom: var(--space-lg);
}

.logo-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-md);
  color: var(--primary);
  animation: logoFloat 3s ease-in-out infinite;
}

.logo-icon svg,
.logo-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

@keyframes logoFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

.logo h1 {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.03em;
}

.tagline {
  color: var(--text-secondary);
  font-size: 1rem;
  font-weight: 400;
  margin-bottom: var(--space-2xl);
}

.home-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
}

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

.home-feature {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--text-muted);
  font-size: 0.8125rem;
  font-weight: 500;
}

.home-feature svg {
  width: 18px;
  height: 18px;
  color: var(--text-muted);
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 12px 24px;
  font-size: 0.9375rem;
  font-weight: 600;
  font-family: inherit;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
  text-decoration: none;
  white-space: nowrap;
}

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

.btn:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

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

.btn-primary {
  background: var(--primary);
  color: var(--text-inverse);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--bg-muted);
  color: var(--text-primary);
  border: 1px solid var(--border-default);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-hover);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover:not(:disabled) {
  background: var(--bg-muted);
  color: var(--text-primary);
}

.btn-danger {
  background: var(--error);
  color: var(--text-inverse);
}

.btn-danger:hover:not(:disabled) {
  background: #dc2626;
}

.btn-large {
  padding: 16px 32px;
  font-size: 1rem;
  border-radius: var(--radius-xl);
}

.btn-full {
  width: 100%;
}

.btn-small {
  padding: 8px 16px;
  font-size: 0.8125rem;
}

.btn-icon-only {
  width: 44px;
  height: 44px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-subtle);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--text-secondary);
  transition: all var(--duration-fast) var(--ease-out);
}

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

.btn-icon-only:hover {
  background: var(--bg-muted);
  color: var(--text-primary);
  border-color: var(--border-default);
}

.btn-icon-only.danger:hover {
  background: var(--error-soft);
  color: var(--error);
  border-color: var(--error);
}

.btn-back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  padding: var(--space-sm) 0;
  margin-bottom: var(--space-lg);
  transition: color var(--duration-fast);
}

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

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

.btn-close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-subtle);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-full);
  cursor: pointer;
  color: var(--text-muted);
  transition: all var(--duration-fast);
}

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

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

.btn-copy {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  font-size: 0.75rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--primary);
  background: var(--primary-soft);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--duration-fast);
  white-space: nowrap;
}

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

.btn-copy:hover {
  background: var(--primary);
  color: var(--text-inverse);
}

.btn-copy.copied {
  background: var(--success);
  color: var(--text-inverse);
}

/* ==========================================================================
   Setup Screens
   ========================================================================== */

#setup, #room-setup, #join-method {
  background: var(--bg-base);
  align-items: center;
  justify-content: center;
  padding: var(--space-xl);
}

.setup-container {
  background: var(--bg-elevated);
  border-radius: var(--radius-2xl);
  padding: var(--space-xl);
  max-width: 460px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-light);
}

.setup-container h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-xl);
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.optional {
  font-weight: 400;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.setup-section {
  margin-bottom: var(--space-xl);
}

.setup-section label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

input[type="text"] {
  width: 100%;
  padding: 14px 18px;
  font-size: 1rem;
  font-family: inherit;
  border: 2px solid var(--border-light);
  border-radius: var(--radius-lg);
  background: var(--bg-base);
  color: var(--text-primary);
  transition: all var(--duration-fast);
}

input[type="text"]:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-glow);
}

input[type="text"]::placeholder {
  color: var(--text-muted);
}

.input-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: var(--space-sm);
  line-height: 1.4;
}

.name-suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.name-suggestion {
  padding: 8px 16px;
  font-size: 0.8125rem;
  font-weight: 500;
  font-family: inherit;
  background: var(--bg-muted);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--duration-fast);
  color: var(--text-secondary);
}

.name-suggestion:hover {
  background: var(--primary);
  color: var(--text-inverse);
  border-color: var(--primary);
  transform: translateY(-1px);
}

/* ==========================================================================
   Avatar Grid - SVG Avatars
   ========================================================================== */

.avatar-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

.avatar-option {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-muted);
  border: 2px solid var(--border-light);
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
  padding: 8px;
  overflow: hidden;
}

.avatar-option svg {
  width: 100%;
  height: 100%;
}

.avatar-option:hover {
  border-color: var(--primary-light);
  transform: scale(1.05);
  background: var(--bg-subtle);
}

.avatar-option.selected {
  border-color: var(--primary);
  background: var(--primary-soft);
  box-shadow: 0 0 0 4px var(--primary-glow);
}

.room-avatar {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-muted);
  border-radius: var(--radius-xl);
  border: 2px solid var(--border-light);
  overflow: hidden;
  padding: 8px;
}

.room-avatar svg {
  width: 100%;
  height: 100%;
}

.room-avatar.small {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  padding: 6px;
}

/* ==========================================================================
   Join Method Tabs
   ========================================================================== */

.join-tabs {
  display: flex;
  gap: var(--space-xs);
  margin-bottom: var(--space-xl);
  background: var(--bg-muted);
  border-radius: var(--radius-xl);
  padding: 4px;
}

.tab {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 12px 16px;
  font-size: 0.8125rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--duration-fast);
}

.tab svg {
  width: 18px;
  height: 18px;
}

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

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

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.error-message {
  color: var(--error);
  font-size: 0.8125rem;
  margin-top: var(--space-md);
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
}

/* ==========================================================================
   Waiting Room
   ========================================================================== */

#waiting {
  background: var(--bg-base);
  align-items: center;
  justify-content: center;
  padding: var(--space-xl);
}

.waiting-container {
  background: var(--bg-elevated);
  border-radius: var(--radius-2xl);
  padding: var(--space-xl);
  max-width: 460px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-light);
}

.room-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--border-light);
}

.room-header h2 {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--text-primary);
}

.invite-section h3,
.members-section h3 {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: var(--space-md);
}

.invite-section h3 svg,
.members-section h3 svg {
  width: 18px;
  height: 18px;
}

.invite-card {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  background: var(--bg-muted);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  margin-bottom: var(--space-md);
  border: 1px solid var(--border-light);
}

.invite-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.invite-label svg {
  width: 14px;
  height: 14px;
}

.invite-value {
  flex: 1;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.8125rem;
  color: var(--text-primary);
  word-break: break-all;
  text-align: left;
}

.invite-toggle {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  margin-bottom: var(--space-md);
}

.toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px 18px;
  font-size: 0.8125rem;
  font-weight: 500;
  font-family: inherit;
  color: var(--text-secondary);
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--duration-fast);
}

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

.toggle-btn:hover {
  border-color: var(--primary-light);
  color: var(--primary);
}

.toggle-btn.active {
  background: var(--primary);
  color: var(--text-inverse);
  border-color: var(--primary);
}

.invite-content {
  margin-bottom: var(--space-lg);
}

.invite-content img {
  display: block;
  max-width: 180px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.members-section {
  border-top: 1px solid var(--border-light);
  padding-top: var(--space-lg);
  margin-top: var(--space-lg);
}

.member-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 24px;
  padding: 0 8px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-inverse);
  background: var(--primary);
  border-radius: var(--radius-full);
}

.members-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.member-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 8px 14px;
  background: var(--bg-muted);
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  border: 1px solid var(--border-light);
  animation: chipFadeIn var(--duration-normal) var(--ease-out);
}

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

.member-chip .avatar {
  width: 24px;
  height: 24px;
  border-width: 1px;
}

.member-chip .name {
  font-weight: 500;
  color: var(--text-primary);
}

.member-chip .badge {
  font-size: 0.625rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  background: var(--primary);
  color: var(--text-inverse);
}

.member-chip.is-you {
  background: var(--primary-soft);
  border-color: var(--primary-light);
}

.member-chip.reconnecting {
  opacity: 0.5;
  border-style: dashed;
}

.member-chip.reconnecting .avatar {
  filter: grayscale(50%);
}

.waiting-note {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  color: var(--text-muted);
  font-size: 0.8125rem;
  margin-top: var(--space-lg);
  text-align: center;
}

.waiting-note svg {
  width: 18px;
  height: 18px;
  animation: pulse 2s ease-in-out infinite;
}

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

/* ==========================================================================
   Chat Screen - Modern Window Style
   ========================================================================== */

#chat {
  display: none;
  flex-direction: row;
  background: var(--bg-subtle);
  justify-content: center;
  align-items: center;
  padding: var(--space-lg);
}

#chat.active {
  display: flex;
}

.chat-container {
  position: relative;
  display: flex;
  flex-direction: column;
  width: 90vw;
  max-width: 600px;
  height: 85vh;
  max-height: 900px;
  overflow: hidden;
  background: var(--bg-base);
  box-shadow: var(--shadow-xl);
  border-radius: var(--radius-2xl);
  border: 1px solid var(--border-light);
}

@media (max-width: 640px) {
  #chat {
    padding: var(--space-sm);
  }
  
  .chat-container {
    width: 100%;
    height: calc(100vh - var(--space-sm) * 2);
    max-height: none;
    border-radius: var(--radius-xl);
  }
}

@media (min-width: 1200px) {
  .chat-container {
    max-width: 700px;
    height: 80vh;
  }
}

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border-light);
  border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
}

.chat-header-left {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.chat-header-info h2 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.chat-header-info .member-count {
  font-size: 0.6875rem;
  background: var(--success-soft);
  color: var(--success);
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.chat-header-right {
  display: flex;
  gap: var(--space-sm);
}

.admin-only {
  display: none;
}

.is-admin .admin-only {
  display: flex;
}

/* Hide waiting note for admin */
.waiting-note {
  display: flex;
}

.is-admin .waiting-note {
  display: none;
}

/* Chat Banner */
.chat-banner {
  display: none;
  padding: var(--space-sm) var(--space-lg);
  font-size: 0.8125rem;
  font-weight: 500;
  text-align: center;
  animation: bannerSlide var(--duration-normal) var(--ease-out);
}

.chat-banner.visible {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
}

.chat-banner.success { background: var(--success-soft); color: var(--success); }
.chat-banner.error { background: var(--error-soft); color: var(--error); }
.chat-banner.info { background: var(--info-soft); color: var(--info); }
.chat-banner.warning { background: var(--warning-soft); color: var(--warning); }

@keyframes bannerSlide {
  from { opacity: 0; transform: translateY(-100%); }
  to { opacity: 1; transform: translateY(0); }
}

/* Connection Status Bar - shows during reconnection */
.connection-status {
  display: none;
  padding: var(--space-sm) var(--space-lg);
  font-size: 0.8125rem;
  font-weight: 500;
  text-align: center;
  background: var(--warning-soft);
  color: var(--warning);
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
}

.connection-status.visible {
  display: flex;
}

.connection-status .spinner {
  width: 14px;
  height: 14px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Disabled state for chat input during reconnection */
.chat-input-wrapper.disabled {
  opacity: 0.5;
  pointer-events: none;
}

.chat-input-wrapper.disabled .chat-input {
  background: var(--bg-muted);
}

.chat-input-wrapper.disabled .send-btn {
  cursor: not-allowed;
}

/* Chat Messages Area */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  background: linear-gradient(180deg, var(--bg-subtle) 0%, var(--bg-base) 100%);
  scroll-behavior: smooth;
}

/* Custom scrollbar for chat */
.chat-messages::-webkit-scrollbar {
  width: 6px;
}

.chat-messages::-webkit-scrollbar-track {
  background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
  background: var(--border-default);
  border-radius: 3px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* Message Styles */
.message {
  display: flex;
  gap: var(--space-sm);
  max-width: 80%;
  animation: messageSlideIn 0.3s var(--ease-out);
}

@keyframes messageSlideIn {
  from { 
    opacity: 0; 
    transform: translateY(12px) scale(0.98);
  }
  to { 
    opacity: 1; 
    transform: translateY(0) scale(1);
  }
}

.message.own {
  flex-direction: row-reverse;
  margin-left: auto;
}

.message.own .message-content {
  align-items: flex-end;
}

.message-avatar {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-elevated);
  border-radius: var(--radius-full);
  border: 2px solid var(--border-light);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  align-self: flex-end;
}

.message-avatar svg {
  width: 100%;
  height: 100%;
}

.message-content {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-width: 100%;
  min-width: 0;
  overflow: hidden;
}

.message-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.75rem;
  padding: 0 var(--space-sm);
}

.message-name {
  font-weight: 400;
  color: var(--text-secondary);
}

.message-time {
  color: var(--text-muted);
  font-size: 0.6875rem;
}

.message-badge {
  font-size: 0.5625rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  background: var(--primary);
  color: var(--text-inverse);
}

/* Modern Message Bubbles */
.message-bubble {
  padding: var(--space-sm) var(--space-md);
  background: linear-gradient(135deg, #f8f9fc 0%, #ffffff 100%);
  border-radius: var(--radius-xl);
  border-bottom-left-radius: 6px;
  font-size: 0.9375rem;
  line-height: 1.5;
  word-wrap: break-word;
  overflow-wrap: break-word;
  word-break: break-word;
  hyphens: auto;
  max-width: 100%;
  box-shadow: 
    0 2px 8px rgba(0, 0, 0, 0.06),
    0 1px 2px rgba(0, 0, 0, 0.04);
  border: 1px solid rgba(0, 0, 0, 0.04);
  position: relative;
  transition: all 0.15s ease;
}

.message-bubble:hover {
  transform: scale(1.01);
  box-shadow: 
    0 4px 12px rgba(0, 0, 0, 0.08),
    0 2px 4px rgba(0, 0, 0, 0.04);
}

/* Own message bubble - gradient style */
.message.own .message-bubble {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-hover) 100%);
  color: var(--text-inverse);
  border-radius: var(--radius-xl);
  border-bottom-right-radius: 6px;
  border-color: transparent;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.25);
}

.message.own .message-header {
  flex-direction: row-reverse;
}

.message.own .message-time {
  color: var(--text-muted);
}

/* System message */
.system-message {
  text-align: center;
  padding: var(--space-sm) var(--space-md);
  font-size: 0.75rem;
  color: var(--text-muted);
  max-width: 100%;
  animation: messageSlideIn 0.3s var(--ease-out);
  position: relative;
}

.system-message::before,
.system-message::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border-light);
}

.system-message {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* Modern Typing Indicator */
.typing-indicator {
  display: none;
  padding: var(--space-sm) var(--space-lg);
  font-size: 0.8125rem;
  color: var(--text-secondary);
  background: transparent;
  align-items: center;
  gap: var(--space-sm);
}

.typing-indicator.visible {
  display: flex;
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Typing bubble with jumping dots */
.typing-bubble {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-elevated);
  border-radius: var(--radius-xl);
  border-bottom-left-radius: 6px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-xs);
}

.typing-dots {
  display: flex;
  align-items: center;
  gap: 4px;
  height: 20px;
}

.typing-dots span {
  width: 8px;
  height: 8px;
  background: var(--primary);
  border-radius: 50%;
  animation: typingBounce 1.4s infinite ease-in-out;
  opacity: 0.7;
}

.typing-dots span:nth-child(1) { animation-delay: 0s; }
.typing-dots span:nth-child(2) { animation-delay: 0.15s; }
.typing-dots span:nth-child(3) { animation-delay: 0.3s; }

@keyframes typingBounce {
  0%, 60%, 100% { 
    transform: translateY(0);
    opacity: 0.4;
  }
  30% { 
    transform: translateY(-8px);
    opacity: 1;
  }
}

/* Chat Input - Modern Style */
.chat-input {
  display: flex;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-elevated);
  border-top: 1px solid var(--border-light);
  border-radius: 0 0 var(--radius-2xl) var(--radius-2xl);
}

.chat-input input {
  flex: 1;
  border-radius: var(--radius-full);
  padding: 12px 20px;
  font-size: 0.9375rem;
  background: var(--bg-subtle);
  border: 2px solid transparent;
  transition: all var(--duration-fast);
}

.chat-input input:focus {
  background: var(--bg-base);
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-glow);
}

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

.btn-send {
  width: 48px;
  height: 48px;
  padding: 0;
  border-radius: var(--radius-lg);
  background: var(--primary);
  color: var(--text-inverse);
  border: none;
  cursor: pointer;
  transition: all var(--duration-fast);
}

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

.btn-send:hover:not(:disabled) {
  background: var(--primary-hover);
}

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

/* ==========================================================================
   Members Sidebar
   ========================================================================== */

.members-sidebar {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 280px;
  max-width: 100%;
  background: var(--bg-elevated);
  border-left: 1px solid var(--border-light);
  border-radius: 0 var(--radius-2xl) var(--radius-2xl) 0;
  display: flex;
  flex-direction: column;
  animation: sidebarSlide var(--duration-normal) var(--ease-out);
  z-index: 10;
  box-shadow: -4px 0 20px rgba(0, 0, 0, 0.1);
}

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

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border-light);
}

.sidebar-header h3 {
  font-size: 1rem;
  font-weight: 600;
}

.sidebar-members {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-md);
}

.sidebar-member {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  border-radius: var(--radius-lg);
  transition: background var(--duration-fast);
}

.sidebar-member:hover {
  background: var(--bg-muted);
}

.sidebar-member .avatar {
  width: 40px;
  height: 40px;
}

.sidebar-member-info {
  flex: 1;
  min-width: 0;
}

.sidebar-member-name {
  font-size: 0.875rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-member-role {
  font-size: 0.6875rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
}

.sidebar-member-role svg {
  width: 12px;
  height: 12px;
}

.sidebar-member-actions {
  display: none;
  gap: var(--space-xs);
  margin-top: var(--space-xs);
}

.sidebar-member:hover .sidebar-member-actions {
  display: flex;
}

.sidebar-member-actions button {
  padding: 6px 10px;
  font-size: 0.6875rem;
  font-weight: 600;
  font-family: inherit;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--duration-fast);
}

.btn-promote {
  background: var(--success-soft);
  color: var(--success);
}

.btn-promote:hover {
  background: var(--success);
  color: var(--text-inverse);
}

.btn-kick {
  background: var(--error-soft);
  color: var(--error);
}

.btn-kick:hover {
  background: var(--error);
  color: var(--text-inverse);
}

/* Reconnecting member status */
.sidebar-member.reconnecting {
  opacity: 0.6;
}

.sidebar-member.reconnecting .avatar {
  filter: grayscale(50%);
}

.sidebar-member-status {
  font-size: 0.625rem;
  color: var(--warning);
  display: flex;
  align-items: center;
  gap: 4px;
}

.sidebar-member-status .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--warning);
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

/* ==========================================================================
   Modals & Overlays
   ========================================================================== */

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: overlayFade var(--duration-fast) var(--ease-out);
}

@keyframes overlayFade {
  from { opacity: 0; }
  to { opacity: 1; }
}

.overlay-content {
  background: var(--bg-elevated);
  border-radius: var(--radius-2xl);
  padding: var(--space-2xl);
  max-width: 400px;
  width: 90%;
  text-align: center;
  box-shadow: var(--shadow-xl);
  animation: overlaySlide var(--duration-slow) var(--ease-out);
}

@keyframes overlaySlide {
  from { opacity: 0; transform: scale(0.95) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.overlay-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-lg);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.overlay-icon.warning {
  background: var(--warning-soft);
  color: var(--warning);
}

.overlay-icon.info {
  background: var(--info-soft);
  color: var(--info);
}

.overlay-content h3 {
  font-size: 1.375rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.overlay-content p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin-bottom: var(--space-lg);
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  animation: overlayFade var(--duration-fast) var(--ease-out);
}

.modal-content {
  background: var(--bg-elevated);
  border-radius: var(--radius-2xl);
  padding: var(--space-xl);
  max-width: 420px;
  width: 90%;
  position: relative;
  box-shadow: var(--shadow-xl);
  animation: overlaySlide var(--duration-slow) var(--ease-out);
}

.modal-content h3 {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-size: 1.125rem;
  margin-bottom: var(--space-xl);
  text-align: center;
}

.modal-content h3 svg {
  width: 22px;
  height: 22px;
  color: var(--primary);
}

.modal-content .btn-close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
}

.modal-qr {
  display: block;
  max-width: 180px;
  margin: var(--space-md) auto 0;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

/* Confirmation Dialog */
.confirm-dialog {
  text-align: center;
  max-width: 380px;
}

.confirm-dialog h3 {
  margin-bottom: var(--space-sm);
  justify-content: center;
}

.confirm-dialog p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.5;
  margin-bottom: var(--space-xl);
}

.confirm-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-lg);
}

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

.confirm-icon.danger {
  background: var(--error-soft);
  color: var(--error);
}

.confirm-icon.warning {
  background: var(--warning-soft);
  color: var(--warning);
}

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

.confirm-actions .btn {
  min-width: 100px;
}

/* Alert Dialog */
.alert-dialog {
  text-align: center;
  max-width: 380px;
}

.alert-dialog h3 {
  margin-bottom: var(--space-sm);
  justify-content: center;
}

.alert-dialog p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.5;
  margin-bottom: var(--space-xl);
}

.alert-dialog-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-lg);
}

.alert-dialog-icon svg {
  width: 28px;
  height: 28px;
}

.alert-dialog-icon.error {
  background: var(--error-soft);
  color: var(--error);
}

.alert-dialog-icon.warning {
  background: var(--warning-soft);
  color: var(--warning);
}

.alert-dialog-icon.info {
  background: var(--primary-soft);
  color: var(--primary);
}

.alert-dialog-icon.success {
  background: var(--success-soft);
  color: var(--success);
}

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

.alert-actions .btn {
  min-width: 120px;
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */

.hidden {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ==========================================================================
   Scrollbar Styling
   ========================================================================== */

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

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

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

/* ==========================================================================
   Responsive Design
   ========================================================================== */

@media (max-width: 768px) {
  .logo h1 {
    font-size: 2rem;
  }
  
  .setup-container,
  .waiting-container {
    margin: var(--space-md);
    padding: var(--space-lg);
  }
  
  .avatar-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-sm);
  }
  
  .members-sidebar {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    max-width: 320px;
    z-index: 50;
    transform: translateX(100%);
    transition: transform var(--duration-normal) var(--ease-out);
  }
  
  .members-sidebar:not(.hidden) {
    transform: translateX(0);
  }
  
  .message {
    max-width: 85%;
  }
  
  .chat-header {
    padding: var(--space-md);
  }
  
  .chat-input {
    padding: var(--space-md);
  }
  
  .chat-messages {
    padding: var(--space-md);
  }
}

@media (max-width: 480px) {
  .btn-large {
    padding: 14px 24px;
    font-size: 0.9375rem;
  }
  
  .home-container {
    padding: var(--space-md);
  }
  
  .home-footer {
    flex-direction: column;
    gap: var(--space-md);
  }
  
  .invite-card {
    flex-direction: column;
    align-items: stretch;
    text-align: center;
    gap: var(--space-sm);
  }
  
  .invite-value {
    text-align: center;
  }
  
  .invite-label {
    justify-content: center;
  }
  
  .btn-copy {
    width: 100%;
    justify-content: center;
  }
}