/* ========== ПЕРЕМЕННЫЕ ========== */
:root {
  --dark-blue: #0a0f1f;
  --darker-blue: #050a15;
  --card-blue: #1a1f2f;
  --accent-blue: #2a6dff;
  --accent-hover: #1a5ae5;
  --text-white: #ffffff;
  --text-gray: #9ca3af;
  --border-color: #2a2f3f;
  --success: #10b981;
  --error: #ef4444;
  --online: #10b981;
  --offline: #6b7280;
}

/* ========== ОСНОВНЫЕ СТИЛИ ========== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--dark-blue);
  color: var(--text-white);
  height: 100vh;
  overflow: hidden;
}

/* ========== АВТОРИЗАЦИЯ ========== */
.auth-container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background: linear-gradient(135deg, var(--dark-blue) 0%, var(--darker-blue) 100%);
}

.auth-card {
  background: var(--card-blue);
  border-radius: 24px;
  padding: 40px;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  border: 1px solid var(--border-color);
}

.auth-logo {
  text-align: center;
  margin-bottom: 30px;
}

.auth-logo i {
  font-size: 48px;
  color: var(--accent-blue);
  margin-bottom: 12px;
}

.auth-logo h1 {
  font-size: 28px;
  font-weight: 600;
  background: linear-gradient(135deg, var(--text-white) 0%, var(--accent-blue) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.auth-tabs {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
  background: var(--dark-blue);
  border-radius: 12px;
  padding: 4px;
}

.tab-btn {
  flex: 1;
  background: transparent;
  border: none;
  padding: 10px;
  border-radius: 8px;
  color: var(--text-gray);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s;
}

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

.auth-form {
  display: none;
}

.auth-form.active {
  display: block;
  animation: fadeIn 0.3s;
}

.input-group {
  display: flex;
  align-items: center;
  background: var(--dark-blue);
  border-radius: 12px;
  padding: 12px 16px;
  margin-bottom: 16px;
  border: 1px solid var(--border-color);
  transition: all 0.3s;
}

.input-group:focus-within {
  border-color: var(--accent-blue);
}

.input-group i {
  color: var(--text-gray);
  margin-right: 12px;
}

.input-group input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-white);
  font-size: 16px;
  outline: none;
}

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

.btn-primary {
  width: 100%;
  background: var(--accent-blue);
  border: none;
  padding: 12px;
  border-radius: 12px;
  color: var(--text-white);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
}

.error-message {
  margin-top: 16px;
  padding: 12px;
  background: rgba(239, 68, 68, 0.1);
  border-radius: 8px;
  color: var(--error);
  font-size: 14px;
  text-align: center;
  display: none;
}

/* ========== ОСНОВНОЙ ИНТЕРФЕЙС ========== */
.app-container {
  display: flex;
  height: 100vh;
  background: var(--dark-blue);
}

/* Боковая панель */
.sidebar {
  width: 320px;
  background: var(--darker-blue);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease;
}

.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.avatar {
  width: 40px;
  height: 40px;
  background: var(--accent-blue);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.avatar i {
  font-size: 20px;
}

.user-details span {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-white);
}

.icon-btn {
  background: transparent;
  border: none;
  color: var(--text-gray);
  font-size: 20px;
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  transition: all 0.3s;
}

.icon-btn:hover {
  background: var(--card-blue);
  color: var(--text-white);
}

.sidebar-actions {
  padding: 16px;
  border-bottom: 1px solid var(--border-color);
}

.btn-new-chat {
  width: 100%;
  background: var(--accent-blue);
  border: none;
  padding: 10px;
  border-radius: 10px;
  color: var(--text-white);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-new-chat:hover {
  background: var(--accent-hover);
}

/* Список чатов */
.chats-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.chat-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.3s;
  margin-bottom: 4px;
}

.chat-item:hover {
  background: var(--card-blue);
}

.chat-item.active {
  background: var(--card-blue);
  border-left: 3px solid var(--accent-blue);
}

.chat-avatar {
  width: 48px;
  height: 48px;
  background: var(--dark-blue);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.chat-avatar i {
  font-size: 24px;
  color: var(--accent-blue);
}

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

.chat-name {
  font-weight: 600;
  margin-bottom: 4px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.chat-name h4 {
  font-size: 14px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chat-time {
  font-size: 11px;
  color: var(--text-gray);
}

.chat-last-message {
  font-size: 12px;
  color: var(--text-gray);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.unread-badge {
  background: var(--accent-blue);
  color: var(--text-white);
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 10px;
  min-width: 20px;
  text-align: center;
}

/* Область чата */
.chat-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--dark-blue);
}

.chat-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 16px;
}

.mobile-only {
  display: none;
}

.chat-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.chat-info .chat-avatar {
  width: 40px;
  height: 40px;
}

.chat-info .chat-avatar i {
  font-size: 20px;
}

.chat-details h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.status {
  font-size: 12px;
  color: var(--offline);
}

.status.online {
  color: var(--online);
}

/* Сообщения */
.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.messages {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.empty-chat {
  text-align: center;
  color: var(--text-gray);
  margin-top: 100px;
}

.empty-chat i {
  font-size: 64px;
  margin-bottom: 16px;
  opacity: 0.5;
}

.message {
  display: flex;
  animation: fadeIn 0.3s;
}

.message.own {
  justify-content: flex-end;
}

.message-bubble {
  max-width: 70%;
  padding: 10px 14px;
  border-radius: 18px;
  background: var(--card-blue);
  word-wrap: break-word;
}

.message.own .message-bubble {
  background: var(--accent-blue);
}

.message-text {
  font-size: 14px;
  line-height: 1.4;
}

.message-file {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 12px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  text-decoration: none;
  color: var(--text-white);
}

.message-file i {
  font-size: 24px;
}

.message-file-info {
  display: flex;
  flex-direction: column;
}

.message-file-name {
  font-size: 12px;
  font-weight: 500;
}

.message-file-size {
  font-size: 10px;
  opacity: 0.7;
}

.message-time {
  font-size: 10px;
  opacity: 0.7;
  margin-top: 4px;
  text-align: right;
}

/* Поле ввода */
.message-input-area {
  padding: 16px 20px;
  border-top: 1px solid var(--border-color);
  background: var(--darker-blue);
}

.file-preview {
  margin-bottom: 12px;
  padding: 8px 12px;
  background: var(--card-blue);
  border-radius: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.file-preview-content {
  display: flex;
  align-items: center;
  gap: 12px;
}

.input-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--card-blue);
  border-radius: 24px;
  padding: 8px 16px;
}

#message-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-white);
  font-size: 14px;
  outline: none;
  padding: 8px 0;
}

#message-input::placeholder {
  color: var(--text-gray);
}

.btn-send {
  background: var(--accent-blue);
  border: none;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  color: var(--text-white);
  cursor: pointer;
  transition: all 0.3s;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.btn-send:not(:disabled):hover {
  background: var(--accent-hover);
  transform: scale(1.05);
}

.icon-btn-small {
  background: transparent;
  border: none;
  color: var(--text-gray);
  cursor: pointer;
  padding: 4px;
}

/* Модальное окно */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal-content {
  background: var(--card-blue);
  border-radius: 20px;
  width: 90%;
  max-width: 400px;
  border: 1px solid var(--border-color);
}

.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h3 {
  font-size: 18px;
}

.close-modal {
  background: transparent;
  border: none;
  color: var(--text-gray);
  font-size: 24px;
  cursor: pointer;
}

.modal-body {
  padding: 20px;
}

.search-results {
  margin-top: 16px;
  max-height: 300px;
  overflow-y: auto;
}

.search-result-item {
  padding: 12px;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.3s;
  margin-bottom: 8px;
  background: var(--dark-blue);
}

.search-result-item:hover {
  background: var(--accent-blue);
}

/* Анимации */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Скроллбар */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--darker-blue);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-blue);
}

/* ========== АДАПТИВНОСТЬ ========== */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 280px;
    z-index: 100;
    transform: translateX(-100%);
  }
  
  .sidebar.open {
    transform: translateX(0);
  }
  
  .mobile-only {
    display: block;
  }
  
  .chat-area {
    width: 100%;
  }
  
  .message-bubble {
    max-width: 85%;
  }
}

.loading-chats {
  text-align: center;
  padding: 40px;
  color: var(--text-gray);
}

.loading-chats i {
  margin-right: 8px;
}