/* ==========================================================================
   Video Call Application Styles
   A modern, clean dark theme design for video calling
   ========================================================================== */

/* ==========================================================================
   CSS Variables - Design Tokens
   ========================================================================== */

:root {
  /* Colors - Primary Palette */
  --color-bg-primary: #1a1a2e;
  --color-bg-secondary: #16213e;
  --color-bg-tertiary: #0f0f23;
  --color-bg-card: #252542;
  --color-bg-input: #2d2d4a;
  --color-bg-hover: #3d3d5c;

  /* Colors - Accent */
  --color-accent: #4361ee;
  --color-accent-hover: #3651de;
  --color-accent-light: rgba(67, 97, 238, 0.15);

  /* Colors - Semantic */
  --color-danger: #ef476f;
  --color-danger-hover: #df3760;
  --color-success: #06d6a0;
  --color-warning: #ffd166;
  --color-muted: #8892b0;

  /* Colors - Text */
  --color-text-primary: #ffffff;
  --color-text-secondary: #a8b2d1;
  --color-text-muted: #6c7a9c;

  /* Colors - Borders */
  --color-border: rgba(255, 255, 255, 0.1);
  --color-border-focus: var(--color-accent);

  /* Spacing Scale */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --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 20px rgba(67, 97, 238, 0.3);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;

  /* Layout */
  --header-height: 60px;
  --control-bar-height: 80px;
  --chat-width: 320px;
  --local-video-width: 200px;
}

/* ==========================================================================
   CSS 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-family);
  font-size: var(--font-size-md);
  line-height: 1.5;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  min-height: 100vh;
  overflow-x: hidden;
}

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

input {
  font-family: inherit;
  border: none;
  outline: none;
}

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

.hidden {
  display: none !important;
}

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

/* ==========================================================================
   Join Screen
   ========================================================================== */

.join-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: var(--space-lg);
  background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
}

.join-container {
  display: flex;
  gap: var(--space-xl);
  width: 100%;
  max-width: 900px;
  animation: fadeInUp 0.5s ease;
}

/* Room List Card */
.room-list-card {
  flex: 1;
  max-width: 400px;
  padding: var(--space-xl);
  background-color: var(--color-bg-card);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
}

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

.room-list-card__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.btn-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg-input);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

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

.room-list {
  flex: 1;
  min-height: 200px;
  max-height: 400px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.room-list__empty {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--color-text-muted);
  padding: var(--space-xl);
}

.room-list__empty svg {
  margin-bottom: var(--space-md);
  opacity: 0.5;
}

.room-list__empty p {
  margin: var(--space-xs) 0;
}

.room-list__hint {
  font-size: var(--font-size-sm);
}

.room-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md);
  background-color: var(--color-bg-input);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.room-item:hover {
  background-color: var(--color-bg-hover);
}

.room-item__info {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.room-item__name {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.room-item__users {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.room-item__join {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  background-color: var(--color-accent);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.room-item__join:hover {
  background-color: var(--color-accent-hover);
}

/* Tab Buttons */
.tab-buttons {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  background-color: var(--color-bg-input);
  padding: var(--space-xs);
  border-radius: var(--radius-md);
}

.tab-btn {
  flex: 1;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-muted);
  background: transparent;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

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

.tab-btn--active {
  color: var(--color-text-primary);
  background-color: var(--color-accent);
}

/* Mobile: Stack vertically */
@media (max-width: 768px) {
  .join-container {
    flex-direction: column;
    max-width: 400px;
  }

  .room-list-card {
    max-width: 100%;
    order: 2;
  }

  .join-card {
    order: 1;
  }

  .room-list {
    max-height: 200px;
  }
}

.join-card {
  flex: 1;
  max-width: 400px;
  padding: var(--space-2xl);
  background-color: var(--color-bg-card);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

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

.join-card__header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.join-card__title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.join-card__subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.join-card__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

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

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

.form-group__input {
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  font-size: var(--font-size-md);
  color: var(--color-text-primary);
  background-color: var(--color-bg-input);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

.form-group__input:focus {
  border-color: var(--color-border-focus);
  box-shadow: var(--shadow-glow);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

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

.btn--primary:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--primary:active {
  transform: translateY(0);
}

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

.btn--danger:hover {
  background-color: var(--color-danger-hover);
}

.btn--full {
  width: 100%;
}

/* ==========================================================================
   Video Call Screen
   ========================================================================== */

.call-screen {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh; /* Dynamic viewport height for mobile */
  background-color: var(--color-bg-tertiary);
  overflow: hidden;
}

.call-screen__main {
  flex: 1;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  min-height: 0;
}

/* ==========================================================================
   Video Grid
   ========================================================================== */

.video-grid {
  flex: 1;
  display: grid;
  gap: var(--space-md);
  padding: var(--space-md);
  padding-bottom: calc(var(--control-bar-height) + var(--space-lg));
  grid-template-columns: 1fr;
  grid-template-rows: 1fr;
  min-height: 0;
}

/* Grid layouts based on participant count */
.video-grid[data-count="1"] {
  grid-template-columns: 1fr;
  grid-template-rows: 1fr;
}

.video-grid[data-count="2"] {
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: 1fr;
}

.video-grid[data-count="3"],
.video-grid[data-count="4"] {
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(2, 1fr);
}

.video-grid[data-count="5"],
.video-grid[data-count="6"] {
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(2, 1fr);
}

/* Mobile: Stack videos vertically */
@media (max-width: 768px) {
  .video-grid[data-count="2"] {
    grid-template-columns: 1fr;
    grid-template-rows: repeat(2, 1fr);
  }

  .video-grid[data-count="3"],
  .video-grid[data-count="4"] {
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(2, 1fr);
  }
}

/* ==========================================================================
   Video Container
   ========================================================================== */

.video-container {
  position: relative;
  width: 100%;
  height: 100%;
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.video-container__video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background-color: var(--color-bg-tertiary);
}

.video-container__video.mirror {
  transform: scaleX(-1);
}

.video-container__overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-md);
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.video-container__name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.video-container__indicators {
  display: flex;
  gap: var(--space-sm);
}

/* ==========================================================================
   Status Indicators
   ========================================================================== */

.status-indicator {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  background-color: rgba(0, 0, 0, 0.5);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
}

.status-indicator--muted {
  background-color: var(--color-danger);
}

.status-indicator--active {
  background-color: var(--color-success);
}

/* Connection status badge */
.connection-status {
  position: fixed;
  top: var(--space-md);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background-color: var(--color-bg-card);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  box-shadow: var(--shadow-md);
  z-index: 100;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.connection-status.visible {
  opacity: 1;
}

.connection-status__dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background-color: var(--color-warning);
  animation: pulse 1.5s infinite;
}

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

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

/* ==========================================================================
   Local Video (Picture-in-Picture)
   ========================================================================== */

.local-video {
  position: absolute;
  bottom: calc(var(--control-bar-height) + var(--space-lg));
  right: var(--space-lg);
  width: var(--local-video-width);
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  z-index: 50;
  transition: transform var(--transition-base), opacity var(--transition-base);
  cursor: move;
}

.local-video:hover {
  transform: scale(1.02);
}

.local-video .video-container__video {
  transform: scaleX(-1);
}

/* Mobile local video size */
@media (max-width: 768px) {
  .local-video {
    width: 120px;
    bottom: calc(var(--control-bar-height) + var(--space-md));
    right: var(--space-md);
  }
}

/* ==========================================================================
   Control Bar
   ========================================================================== */

.control-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--control-bar-height);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-xl);
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
  z-index: 60;
}

.control-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: var(--radius-full);
  background-color: var(--color-bg-card);
  color: var(--color-text-primary);
  font-size: var(--font-size-lg);
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.control-btn:hover {
  background-color: var(--color-bg-hover);
  transform: scale(1.08);
}

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

.control-btn--active {
  background-color: var(--color-accent);
}

.control-btn--active:hover {
  background-color: var(--color-accent-hover);
}

.control-btn--muted {
  background-color: var(--color-danger);
}

.control-btn--muted:hover {
  background-color: var(--color-danger-hover);
}

.control-btn--leave {
  background-color: var(--color-danger);
  width: 60px;
}

.control-btn--leave:hover {
  background-color: var(--color-danger-hover);
}

.control-btn__icon {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Tooltip for control buttons */
.control-btn[data-tooltip] {
  position: relative;
}

.control-btn[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  padding: var(--space-xs) var(--space-sm);
  margin-bottom: var(--space-sm);
  font-size: var(--font-size-xs);
  color: var(--color-text-primary);
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.control-btn[data-tooltip]:hover::after {
  opacity: 1;
}

/* ==========================================================================
   Chat Panel - Bottom Layout
   ========================================================================== */

.chat-panel {
  width: 100%;
  height: 250px;
  min-height: 250px;
  max-height: 250px;
  display: flex;
  flex-direction: column;
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  flex-shrink: 0;
  flex-grow: 0;
  visibility: visible;
  opacity: 1;
  transition: height var(--transition-base), min-height var(--transition-base), max-height var(--transition-base), opacity var(--transition-base);
}

.chat-panel.collapsed {
  height: 0;
  min-height: 0;
  max-height: 0;
  overflow: hidden;
  border-top: none;
  visibility: hidden;
  opacity: 0;
}

/* Chat toggle button */
.chat-toggle {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg-card);
  border-radius: var(--radius-full);
  color: var(--color-text-primary);
  font-size: var(--font-size-lg);
  box-shadow: var(--shadow-md);
  z-index: 70;
  transition: all var(--transition-fast);
}

.chat-toggle:hover {
  background-color: var(--color-bg-hover);
  transform: scale(1.05);
}

.chat-toggle--active {
  background-color: var(--color-accent);
}

.chat-toggle__badge {
  position: absolute;
  top: -4px;
  right: -4px;
  min-width: 18px;
  height: 18px;
  padding: 0 var(--space-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  background-color: var(--color-danger);
  border-radius: var(--radius-full);
}

/* Mobile chat */
@media (max-width: 768px) {
  .chat-panel {
    height: 200px;
    min-height: 200px;
    max-height: 200px;
  }

  .chat-panel.collapsed {
    height: 0;
    min-height: 0;
    max-height: 0;
  }
}

/* Chat header */
.chat-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.chat-panel__title {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.chat-panel__close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}

.chat-panel__close:hover {
  background-color: var(--color-bg-hover);
  color: var(--color-text-primary);
}

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

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

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

.chat-panel__messages::-webkit-scrollbar-thumb {
  background-color: var(--color-bg-hover);
  border-radius: var(--radius-full);
}

/* Chat message */
.chat-message {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  animation: fadeIn 0.3s ease;
}

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

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

.chat-message__header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-xs);
}

.chat-message__sender {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
}

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

.chat-message__content {
  max-width: 85%;
  padding: var(--space-sm) var(--space-md);
  background-color: var(--color-bg-card);
  border-radius: var(--radius-lg);
  border-bottom-left-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  word-wrap: break-word;
}

.chat-message--own .chat-message__content {
  background-color: var(--color-accent);
  border-bottom-left-radius: var(--radius-lg);
  border-bottom-right-radius: var(--radius-sm);
}

/* Chat input area */
.chat-panel__input-area {
  display: flex;
  gap: var(--space-sm);
  padding: var(--space-md);
  border-top: 1px solid var(--color-border);
}

.chat-panel__input {
  flex: 1;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  background-color: var(--color-bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast);
}

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

.chat-panel__input:focus {
  border-color: var(--color-accent);
}

.chat-panel__send {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-accent);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  transition: all var(--transition-fast);
}

.chat-panel__send:hover {
  background-color: var(--color-accent-hover);
}

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

/* Chat overlay - hidden since chat is now at bottom */
.chat-overlay {
  display: none;
}

/* ==========================================================================
   Empty States & Placeholders
   ========================================================================== */

.video-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
}

.video-placeholder__avatar {
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg-card);
  border-radius: var(--radius-full);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.video-placeholder__name {
  font-size: var(--font-size-md);
  color: var(--color-text-secondary);
}

/* Empty chat state */
.chat-empty {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl);
  text-align: center;
}

.chat-empty__icon {
  font-size: 3rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

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

/* ==========================================================================
   Loading States
   ========================================================================== */

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-bg-hover);
  border-top-color: var(--color-accent);
  border-radius: var(--radius-full);
  animation: spin 0.8s linear infinite;
}

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

/* Skeleton loading */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-bg-card) 25%,
    var(--color-bg-hover) 50%,
    var(--color-bg-card) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

@keyframes shimmer {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* ==========================================================================
   Notifications & Toasts
   ========================================================================== */

.toast {
  position: fixed;
  bottom: calc(var(--control-bar-height) + var(--space-lg));
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: var(--space-md) var(--space-lg);
  background-color: var(--color-bg-card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  z-index: 300;
  opacity: 0;
  transition: all var(--transition-base);
}

.toast.visible {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.toast--success {
  border-left: 4px solid var(--color-success);
}

.toast--error {
  border-left: 4px solid var(--color-danger);
}

.toast--info {
  border-left: 4px solid var(--color-accent);
}

/* ==========================================================================
   Accessibility
   ========================================================================== */

/* Focus visible styles */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

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

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --color-border: rgba(255, 255, 255, 0.3);
  }

  .form-group__input,
  .chat-panel__input {
    border-width: 2px;
  }
}

/* ==========================================================================
   Print Styles
   ========================================================================== */

@media print {
  .call-screen,
  .control-bar,
  .chat-panel {
    display: none;
  }
}