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

:root {
  --bg: #0a0a0a;
  --bg-surface: #141414;
  --bg-elevated: #1e1e1e;
  --text: #e0e0e0;
  --text-dim: #888;
  --text-faint: #555;
  --accent: #4af626;
  --accent-dim: #2a8a16;
  --danger: #e53935;
  --border: #2a2a2a;
  --bubble-mine: #1a3a1a;
  --bubble-theirs: #1e1e1e;
  --font: 'SF Mono', 'Fira Code', 'Cascadia Code', 'Menlo', 'Consolas', monospace;
}

html, body {
  height: 100%;
  background: #000;
  font-family: var(--font);
  font-size: 14px;
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

#app {
  max-width: 420px;
  height: 100%;
  margin: 0 auto;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.screen {
  display: none;
  flex-direction: column;
  height: 100%;
}

.screen.active {
  display: flex;
}

/* Onboarding */
#onboarding {
  justify-content: center;
  align-items: center;
  padding: 24px;
  gap: 24px;
  text-align: center;
}

.logo {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--accent);
}

.logo-sub {
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 4px;
}

.btn {
  display: inline-block;
  padding: 12px 32px;
  background: var(--accent);
  color: #000;
  border: none;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s;
}

.btn:hover {
  opacity: 0.85;
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}

.btn-outline:hover {
  border-color: var(--text-dim);
}

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

/* Identity Screen */
#identity-screen {
  padding: 24px;
  gap: 16px;
}

.identity-label {
  font-size: 11px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.identity-value {
  font-size: 12px;
  color: var(--accent);
  word-break: break-all;
  background: var(--bg-surface);
  padding: 12px;
  border: 1px solid var(--border);
  cursor: pointer;
  position: relative;
}

.identity-value:active {
  background: var(--bg-elevated);
}

.copy-toast {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--accent);
  color: #000;
  padding: 4px 12px;
  font-size: 11px;
  font-weight: 600;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s;
}

.copy-toast.show {
  opacity: 1;
}

.input {
  width: 100%;
  padding: 12px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  outline: none;
}

.input:focus {
  border-color: var(--accent-dim);
}

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

/* Conversations List */
#conversations {
  flex: 1;
  overflow: hidden;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  border-bottom: 1px solid var(--border);
  min-height: 56px;
}

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

.header-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  font-family: var(--font);
  font-size: 18px;
  cursor: pointer;
  padding: 4px 8px;
}

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

.conversation-list {
  flex: 1;
  overflow-y: auto;
}

.conversation-item {
  display: flex;
  align-items: center;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  gap: 12px;
}

.conversation-item:hover {
  background: var(--bg-surface);
}

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

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

.conversation-name {
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.conversation-preview {
  font-size: 12px;
  color: var(--text-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-top: 2px;
}

.conversation-time {
  font-size: 11px;
  color: var(--text-faint);
  flex-shrink: 0;
}

.online-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
}

.offline-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-faint);
  display: inline-block;
}

.empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 32px;
  gap: 12px;
  color: var(--text-dim);
  text-align: center;
}

.empty-state-hint {
  font-size: 12px;
  color: var(--text-faint);
}

/* Chat View */
#chat {
  flex: 1;
  overflow: hidden;
}

.chat-header {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  gap: 12px;
  min-height: 56px;
}

.back-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  font-family: var(--font);
  font-size: 20px;
  cursor: pointer;
  padding: 4px;
}

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

.chat-peer-name {
  font-size: 14px;
  font-weight: 500;
  flex: 1;
}

.chat-peer-status {
  font-size: 11px;
  color: var(--text-faint);
}

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.message {
  max-width: 80%;
  padding: 8px 12px;
  font-size: 13px;
  line-height: 1.4;
  word-wrap: break-word;
}

.message-mine {
  align-self: flex-end;
  background: var(--bubble-mine);
  border: 1px solid #2a4a2a;
}

.message-theirs {
  align-self: flex-start;
  background: var(--bubble-theirs);
  border: 1px solid var(--border);
}

.message-system {
  align-self: center;
  color: var(--text-faint);
  font-size: 11px;
  padding: 4px 0;
  background: none;
  border: none;
}

.message-meta {
  display: flex;
  justify-content: flex-end;
  gap: 6px;
  margin-top: 4px;
  font-size: 10px;
  color: var(--text-faint);
}

.compose {
  display: flex;
  padding: 12px;
  border-top: 1px solid var(--border);
  gap: 8px;
  background: var(--bg);
}

.compose-input {
  flex: 1;
  padding: 10px 12px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  outline: none;
  resize: none;
  min-height: 40px;
  max-height: 120px;
}

.compose-input:focus {
  border-color: var(--accent-dim);
}

.send-btn {
  padding: 10px 16px;
  background: var(--accent);
  color: #000;
  border: none;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.send-btn:disabled {
  opacity: 0.3;
  cursor: default;
}

/* New Chat Modal */
.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 10;
  padding: 24px;
}

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

.modal {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  padding: 24px;
  width: 100%;
  max-width: 360px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.modal-title {
  font-size: 16px;
  font-weight: 600;
}

.modal-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

/* Settings */
.settings-section {
  padding: 16px;
  border-bottom: 1px solid var(--border);
}

.settings-label {
  font-size: 11px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0;
}

.settings-value {
  font-size: 12px;
  color: var(--accent);
  word-break: break-all;
}

/* Connection status bar */
.status-bar {
  padding: 6px 16px;
  font-size: 11px;
  text-align: center;
  background: var(--bg-elevated);
  color: var(--text-dim);
  display: none;
}

.status-bar.show {
  display: block;
}

.status-bar.connected {
  background: var(--accent-dim);
  color: #fff;
}

.status-bar.error {
  background: var(--danger);
  color: #fff;
}

@media (max-width: 420px) {
  #app {
    max-width: 100%;
  }
}