/* Mobile-first подход */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #2196F3;
  --primary-dark: #1976D2;
  --danger-color: #F44336;
  --success-color: #4CAF50;
  --bg-color: #F5F5F5;
  --surface-color: #FFFFFF;
  --text-primary: #212121;
  --text-secondary: #757575;
  --border-color: #E0E0E0;
  --shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.15);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  touch-action: manipulation;
}

#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Экраны */
.screen {
  display: none;
  flex-direction: column;
  min-height: 100vh;
  max-width: 100%;
  overflow-x: hidden;
}

.screen.active {
  display: flex;
}

/* Загрузка */
#loading-screen {
  justify-content: center;
  align-items: center;
  gap: 1rem;
}

.loading-spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Шапка */
.header {
  background: var(--surface-color);
  padding: 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
  min-height: 56px;
}

/* Хедер в экране чата должен быть фиксированным */
#room-screen > .header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
}

.header h1 {
  font-size: 1.25rem;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.room-name-clickable {
  cursor: pointer;
  user-select: none;
}

.room-name-clickable:active {
  opacity: 0.7;
}

/* Кнопки */
.btn-icon {
  background: none;
  border: none;
  padding: 0.5rem;
  cursor: pointer;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  min-width: 44px;
  min-height: 44px;
  transition: background-color 0.2s;
}

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

.btn-icon:active {
  background-color: var(--border-color);
}

.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;
}

.btn-primary {
  background: var(--primary-color);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  justify-content: center;
  min-height: 44px;
  transition: background-color 0.2s;
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-primary:active {
  opacity: 0.9;
}

.btn-secondary {
  background: var(--surface-color);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  min-height: 44px;
  transition: background-color 0.2s;
}

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

.btn-text {
  background: none;
  border: none;
  color: var(--primary-color);
  font-size: 0.875rem;
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  min-height: 32px;
  border-radius: 4px;
  transition: background-color 0.2s;
}

.btn-text:hover {
  background-color: rgba(33, 150, 243, 0.1);
}

.btn-send {
  background: var(--primary-color);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  min-width: 100px;
  min-height: 44px;
  transition: background-color 0.2s;
}

.btn-send:hover {
  background: var(--primary-dark);
}

.btn-send:active {
  opacity: 0.9;
}

/* Пространство */
.space-info {
  padding: 1rem;
  background: var(--surface-color);
  border-bottom: 1px solid var(--border-color);
}

.hash-display {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.hash-display label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.hash-display code {
  font-family: 'Courier New', monospace;
  font-size: 0.875rem;
  background: var(--bg-color);
  padding: 0.5rem;
  border-radius: 4px;
  word-break: break-all;
  color: var(--text-primary);
}

.warning-box {
  background: #FFF3CD;
  border: 1px solid #FFC107;
  border-radius: 8px;
  padding: 0.75rem;
  font-size: 0.875rem;
  color: #856404;
  line-height: 1.5;
}

.warning-box strong {
  display: block;
  margin-bottom: 0.25rem;
}

/* Комнаты */
.rooms-section {
  flex: 1;
  padding: 1rem;
}

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

.section-header h2 {
  font-size: 1.125rem;
  font-weight: 600;
}

.rooms-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.room-card {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
  cursor: pointer;
  transition: box-shadow 0.2s, transform 0.1s;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 60px;
}

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

.room-card-content {
  flex: 1;
  min-width: 0;
}

.room-card-name {
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 0.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  overflow: hidden;
}

.room-card-name > span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

.unread-badge {
  background: var(--primary-color);
  color: white;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.125rem 0.5rem;
  border-radius: 12px;
  min-width: 20px;
  text-align: center;
  flex-shrink: 0;
  line-height: 1.5;
}

.room-card-actions {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
}

.room-card-action {
  background: none;
  border: none;
  padding: 0.5rem;
  cursor: pointer;
  color: var(--text-secondary);
  border-radius: 4px;
  min-width: 36px;
  min-height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s;
}

.room-card-action:hover {
  background-color: var(--bg-color);
  color: var(--text-primary);
}

/* Чат */
.chat-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--surface-color);
}

/* Отступ для контента под фиксированным хедером в экране чата */
#room-screen > .chat-container {
  margin-top: calc(1rem + 56px + 1rem); /* padding-top + min-height + padding-bottom */
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  -webkit-overflow-scrolling: touch;
}

/* Отступ снизу для контента под фиксированным полем ввода в экране чата */
#room-screen .chat-messages {
  padding-bottom: 0; /* Отступ создаётся якорем */
}

/* Якорь для автопрокрутки - создаёт отступ снизу */
.scroll-anchor {
  height: 0;
  width: 1px;
  flex-shrink: 0;
  pointer-events: none;
  display: block;
}

/* В экране чата якорь создаёт отступ для поля ввода + кнопка */
#room-screen .scroll-anchor {
  height: calc(1rem + 44px + 1rem + 2rem); /* padding + input height + padding + extra space */
}

.message {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  max-width: 85%;
  word-wrap: break-word;
}

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

.message.other {
  align-self: flex-start;
  align-items: flex-start;
}

.message-header {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

.message-name {
  font-weight: 500;
  cursor: pointer;
  user-select: none;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.message-name:active {
  opacity: 0.7;
}

.status-dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  display: inline-block;
  background: #b0b0b0;
}

.status-dot.online {
  background: #2ecc71;
}

.status-dot.offline {
  background: #b0b0b0;
}

.message-time {
  font-size: 0.7rem;
}

.message-content {
  background: var(--bg-color);
  padding: 0.75rem 1rem;
  border-radius: 12px;
  font-size: 0.9375rem;
  line-height: 1.5;
}

.message.own .message-content {
  background: var(--primary-color);
  color: white;
}

.message.other .message-content {
  background: var(--bg-color);
  color: var(--text-primary);
}

.message-content--image {
  padding: 0;
  background: transparent;
}

.message-image {
  display: block;
  max-width: 260px;
  width: 100%;
  height: auto;
  border-radius: 12px;
}

.message-image-wrapper {
  position: relative;
}

.message-delete-btn {
  position: absolute;
  top: 6px;
  right: 6px;
  border: none;
  border-radius: 8px;
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  background: rgba(0, 0, 0, 0.65);
  color: #fff;
  cursor: pointer;
  opacity: 1;
}

.chat-input-container {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1rem;
  background: var(--surface-color);
  border-top: 1px solid var(--border-color);
}

.typing-indicator {
  min-height: 1.25rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.typing-indicator.active {
  opacity: 1;
}

/* Фиксированное позиционирование блока ввода в экране чата */
#room-screen .chat-input-container {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 99;
}

/* Кнопка прокрутки вниз */
.scroll-to-bottom-btn {
  position: fixed;
  bottom: calc(1rem + 44px + 1rem + 1rem); /* Над полем ввода */
  right: 1rem;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary-color);
  color: white;
  border: none;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 98;
  transition: transform 0.2s, opacity 0.2s;
}

.scroll-to-bottom-btn:hover {
  transform: scale(1.1);
}

.scroll-to-bottom-btn:active {
  transform: scale(0.95);
}

.scroll-to-bottom-btn svg {
  flex-shrink: 0;
}

#new-messages-count {
  position: absolute;
  top: -4px;
  right: -4px;
  background: var(--danger-color);
  color: white;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.125rem 0.375rem;
  border-radius: 10px;
  min-width: 18px;
  text-align: center;
  display: none;
}

#new-messages-count:not(:empty) {
  display: block;
}

.input-wrapper {
  display: flex;
  gap: 0.75rem;
  align-items: flex-end;
}

#chat-input {
  flex: 1;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-color);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  resize: none;
  min-height: 44px;
  max-height: 120px;
}

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

/* Модальные окна */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal.active {
  display: flex;
}

.modal-content {
  background: var(--surface-color);
  border-radius: 12px;
  padding: 1.5rem;
  width: 100%;
  max-width: 400px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.modal-content h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.modal-description {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: 1rem;
  line-height: 1.5;
}

.modal-content input {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
  margin-bottom: 1rem;
  min-height: 44px;
}

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

.key-display {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1rem;
  padding: 1rem;
  background: var(--bg-color);
  border-radius: 8px;
}

.key-display code {
  font-family: 'Courier New', monospace;
  font-size: 0.875rem;
  word-break: break-all;
  color: var(--text-primary);
}

.modal-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: flex-end;
}

.modal-actions button {
  flex: 1;
}

/* Уведомления */
.notifications {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-width: calc(100% - 2rem);
}

.notification {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
  box-shadow: var(--shadow-lg);
  min-width: 200px;
  max-width: 400px;
  animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.notification.success {
  border-color: var(--success-color);
  background: #E8F5E9;
}

.notification.error {
  border-color: var(--danger-color);
  background: #FFEBEE;
}

.notification-message {
  font-size: 0.875rem;
  line-height: 1.5;
}

/* Десктопная версия */
@media (min-width: 768px) {
  .screen {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
  }

  .header {
    padding: 1rem 2rem;
  }

  .rooms-section {
    padding: 1.5rem 2rem;
  }

  .space-info {
    padding: 1.5rem 2rem;
  }

  .chat-messages {
    padding: 1.5rem 2rem;
  }

  /* Корректировка отступа снизу для десктопа */
  #room-screen .chat-messages {
    padding-bottom: 0;
  }
  
  #room-screen .scroll-anchor {
    height: calc(1.5rem + 44px + 1.5rem + 2rem); /* Больше отступ для десктопа */
  }

  .chat-input-container {
    padding: 1.5rem 2rem;
  }

  .message {
    max-width: 70%;
  }

  .modal-content {
    padding: 2rem;
  }
}

@media (min-width: 1024px) {
  .room-card:hover {
    box-shadow: var(--shadow);
  }

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