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

:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #1c2333;
  --bg-hover: #21262d;
  --border: #30363d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #484f58;
  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --danger: #f85149;
  --success: #3fb950;
  --warning: #d29922;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow: 0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
}

html, body {
  height: 100%;
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Auth Pages */
.auth-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, var(--bg-primary) 0%, #0f1923 100%);
}

.auth-container {
  width: 100%;
  max-width: 400px;
  padding: 20px;
}

.auth-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow);
}

.auth-header {
  text-align: center;
  margin-bottom: 28px;
}

.auth-header .logo {
  font-size: 40px;
  margin-bottom: 12px;
  opacity: 0.7;
}

.auth-header h1 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 4px;
}

.auth-header p {
  color: var(--text-secondary);
  font-size: 14px;
}

.tab-bar {
  display: flex;
  gap: 4px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  padding: 4px;
  margin-bottom: 24px;
}

.tab-btn {
  flex: 1;
  padding: 8px 16px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s;
}

.tab-btn.active {
  background: var(--accent);
  color: #fff;
}

.tab-btn:hover:not(.active) {
  color: var(--text-primary);
}

.auth-form {
  display: none;
  flex-direction: column;
  gap: 16px;
}

.auth-form.active {
  display: flex;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}

.field input,
.field textarea {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  color: var(--text-primary);
  font-size: 14px;
  font-family: var(--font);
  transition: border-color 0.15s;
  outline: none;
}

.field input:focus,
.field textarea:focus {
  border-color: var(--accent);
}

.field textarea {
  resize: vertical;
  min-height: 60px;
}

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

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

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

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

.error-msg {
  color: var(--danger);
  font-size: 13px;
  display: none;
}

.error-msg.visible {
  display: block;
}

/* App Layout */
.app-layout {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: 240px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.sidebar-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  font-size: 16px;
}

.logo-sm {
  font-size: 22px;
  opacity: 0.7;
}

.sidebar-profile {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}

.avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
  color: #fff;
  flex-shrink: 0;
}

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

.display-name {
  font-weight: 600;
  font-size: 14px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.username {
  font-size: 12px;
  color: var(--text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-actions {
  display: flex;
  gap: 4px;
  padding: 12px 16px;
  margin-top: auto;
  border-top: 1px solid var(--border);
}

.sidebar-btn {
  flex: 1;
  padding: 8px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 18px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s;
}

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

/* Main Content */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
}

.chat-header h2 {
  font-size: 16px;
  font-weight: 600;
}

.connection-status {
  font-size: 12px;
  opacity: 0.5;
  transition: all 0.3s;
}

.connection-status.connected {
  color: var(--success);
  opacity: 1;
}

.connection-status.disconnected {
  color: var(--danger);
  opacity: 1;
}

/* Messages */
.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.messages-container::-webkit-scrollbar {
  width: 6px;
}

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

.empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  gap: 8px;
}

.empty-icon {
  font-size: 48px;
  opacity: 0.3;
  margin-bottom: 8px;
}

.empty-state p {
  font-size: 16px;
  color: var(--text-secondary);
}

.empty-state span {
  font-size: 13px;
}

.message {
  max-width: 75%;
  padding: 9px 14px;
  border-radius: var(--radius-md);
  font-size: 14px;
  line-height: 1.5;
  word-wrap: break-word;
  position: relative;
  animation: msgIn 0.2s ease-out;
}

@keyframes msgIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.message.user {
  align-self: flex-end;
  background: var(--accent);
  color: #fff;
  border-bottom-right-radius: 4px;
}

.message.telegram {
  align-self: flex-start;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}

.message .msg-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 4px;
  font-size: 11px;
  opacity: 0.7;
}

.message.user .msg-meta {
  justify-content: flex-end;
}

.message .msg-img {
  max-width: 280px;
  max-height: 320px;
  border-radius: var(--radius-sm);
  display: block;
  margin-bottom: 6px;
  cursor: pointer;
  transition: opacity 0.15s;
}

.message .msg-img:hover {
  opacity: 0.9;
}

.message .msg-file {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  background: rgba(0,0,0,0.2);
  border-radius: var(--radius-sm);
  margin-bottom: 4px;
  font-size: 13px;
}

.message .msg-file .file-icon {
  font-size: 20px;
}

.message .msg-status {
  font-size: 11px;
}

.message .msg-status.sent { color: var(--text-muted); }
.message .msg-status.delivered { color: var(--text-secondary); }
.message .msg-status.failed { color: var(--danger); }

/* Input Area */
.input-area {
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
  padding: 12px 20px 16px;
}

.input-toolbar {
  margin-bottom: 8px;
}

.upload-btn {
  display: inline-flex;
  align-items: center;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 20px;
  transition: background 0.15s;
}

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

.input-row {
  display: flex;
  gap: 8px;
  align-items: flex-end;
}

#messageInput {
  flex: 1;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  color: var(--text-primary);
  font-size: 14px;
  font-family: var(--font);
  resize: none;
  outline: none;
  max-height: 120px;
  line-height: 1.5;
  transition: border-color 0.15s;
}

#messageInput:focus {
  border-color: var(--accent);
}

.btn-send {
  width: 40px;
  height: 40px;
  border: none;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  cursor: pointer;
  transition: all 0.15s;
  flex-shrink: 0;
}

.btn-send:hover {
  background: var(--accent-hover);
  transform: scale(1.05);
}

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

/* Modal */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  align-items: center;
  justify-content: center;
  z-index: 100;
  backdrop-filter: blur(4px);
}

.modal-overlay.visible {
  display: flex;
}

.modal-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

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

.modal-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 20px;
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
}

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

#profileForm {
  display: flex;
  flex-direction: column;
  gap: 16px;
}