:root {
  color-scheme: dark light;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #121212;
  color: #f1f1f1;
}

body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: stretch;
}

.chat-app {
  width: min(720px, 100vw);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  height: 100vh;
  padding: 1.5rem;
  box-sizing: border-box;
  gap: 1rem;
}

.chat-app__header {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.chat-app__header h1 {
  margin: 0;
  font-size: 1.5rem;
}

.status {
  font-size: 0.9rem;
  color: #8be9fd;
}

.status-banner {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
}

.status-banner--error {
  margin-top: 0.25rem;
  padding: 0.75rem 1rem;
  border-radius: 0.75rem;
  background: rgba(244, 67, 54, 0.12);
  border: 1px solid rgba(244, 67, 54, 0.4);
  color: #ff8a80;
}

.status-banner--error button {
  border: 1px solid rgba(244, 67, 54, 0.45);
  background: rgba(244, 67, 54, 0.2);
  color: #ff8a80;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.2s ease;
}

.status-banner--error button:hover {
  background: rgba(244, 67, 54, 0.35);
}

.info {
  display: flex;
  gap: 1rem;
  font-size: 0.85rem;
  color: #bdbdbd;
}

.chat-app__messages {
  flex: 1;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 0.75rem;
  padding: 1rem;
  background: rgba(0, 0, 0, 0.3);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.chat-app__roster {
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 0.75rem;
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.03);
}

.chat-app__roster h2 {
  margin: 0 0 0.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: #bdbdbd;
}

.chat-app__roster ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.chat-app__roster .member {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: #f1f1f1;
}

.chat-app__roster .member__pubkey {
  font-family: 'Fira Code', 'SFMono-Regular', ui-monospace, monospace;
  font-size: 0.8rem;
}

.chat-app__roster .member__role {
  font-size: 0.75rem;
  padding: 0.1rem 0.4rem;
  border-radius: 999px;
  background: rgba(30, 136, 229, 0.2);
  color: #8ab4f8;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.chat-app__invite {
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 0.75rem;
  padding: 0.75rem 1rem;
  background: rgba(0, 0, 0, 0.25);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.chat-app__invite h2 {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
  color: #bdbdbd;
}

.chat-app__invite form {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.chat-app__invite input[type='text'],
.chat-app__invite input[type='checkbox'] {
  font-family: inherit;
}

.chat-app__invite input[type='text'] {
  padding: 0.4rem 0.5rem;
  border-radius: 0.5rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(0, 0, 0, 0.2);
  color: inherit;
}

.chat-app__invite button {
  align-self: flex-start;
  padding: 0.5rem 0.9rem;
  border-radius: 0.5rem;
  border: none;
  background: #43a047;
  color: white;
  font-weight: 600;
  cursor: pointer;
}

.chat-app__invite button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.chat-app__invite .invite-admin {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: #bdbdbd;
}

.message {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.75rem 1rem;
  border-radius: 0.75rem;
  background: rgba(255, 255, 255, 0.08);
}

.message--self {
  align-self: flex-end;
  background: rgba(56, 142, 255, 0.2);
}

.message__meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  opacity: 0.7;
}

.message__content {
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 0.95rem;
}

.chat-app__footer form {
  display: flex;
  gap: 0.5rem;
  align-items: flex-end;
}

.chat-app__footer textarea {
  flex: 1;
  resize: vertical;
  min-height: 2.5rem;
  max-height: 6rem;
  padding: 0.5rem;
  border-radius: 0.5rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(0, 0, 0, 0.2);
  color: inherit;
}

.chat-app__footer button {
  padding: 0.6rem 1rem;
  border-radius: 0.5rem;
  border: none;
  background: #1e88e5;
  color: white;
  font-weight: 600;
  cursor: pointer;
}

.chat-app__footer button[type='button'] {
  background: #424242;
}

.chat-app__footer button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

@media (max-width: 600px) {
  .chat-app {
    padding: 1rem;
  }
}

.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  font-size: 1rem;
  color: #bdbdbd;
}

.pubkey-display {
  margin-bottom: 1.5rem;
  padding: 1rem;
  background: rgba(139, 233, 253, 0.1);
  border: 1px solid rgba(139, 233, 253, 0.3);
  border-radius: 0.5rem;
}

.pubkey-display label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: #8be9fd;
}

.pubkey-row {
  display: flex;
  gap: 0.5rem;
}

.pubkey-row input {
  flex: 1;
  font-family: 'Fira Code', 'SFMono-Regular', ui-monospace, monospace;
  font-size: 0.85rem;
  padding: 0.5rem;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 0.375rem;
  color: #f1f1f1;
}

.pubkey-row button {
  padding: 0.5rem 1rem;
  background: rgba(139, 233, 253, 0.2);
  border: 1px solid rgba(139, 233, 253, 0.4);
  border-radius: 0.375rem;
  color: #8be9fd;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.2s;
}

.pubkey-row button:hover {
  background: rgba(139, 233, 253, 0.3);
  border-color: rgba(139, 233, 253, 0.6);
}

.form-error {
  padding: 0.5rem 0.75rem;
  margin-top: 0.5rem;
  border-radius: 0.375rem;
  background: rgba(255, 82, 82, 0.15);
  border: 1px solid rgba(255, 82, 82, 0.4);
  color: #ff9999;
  font-size: 0.85rem;
}

.form-success {
  padding: 0.5rem 0.75rem;
  margin-top: 0.5rem;
  border-radius: 0.375rem;
  background: rgba(80, 250, 123, 0.15);
  border: 1px solid rgba(80, 250, 123, 0.4);
  color: #a8f5bc;
  font-size: 0.85rem;
}

/* Error Banner */
.error-banner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 1rem;
  border-radius: 0.5rem;
  margin-bottom: 0.5rem;
  border: 1px solid;
  animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.error-banner--warning {
  background: rgba(255, 193, 7, 0.15);
  border-color: rgba(255, 193, 7, 0.4);
  color: #ffca28;
}

.error-banner--error {
  background: rgba(255, 82, 82, 0.15);
  border-color: rgba(255, 82, 82, 0.4);
  color: #ff9999;
}

.error-banner--critical {
  background: rgba(220, 38, 38, 0.2);
  border-color: rgba(220, 38, 38, 0.6);
  color: #fca5a5;
}

.error-banner__content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.error-banner__title {
  font-weight: 600;
  font-size: 0.95rem;
  margin: 0;
}

.error-banner__message {
  margin: 0;
  font-size: 0.875rem;
  opacity: 0.95;
}

.error-banner__recovery {
  margin: 0;
  font-size: 0.8125rem;
  opacity: 0.85;
  font-style: italic;
}

.error-banner__dismiss {
  background: none;
  border: none;
  color: inherit;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  padding: 0;
  margin-left: 1rem;
  opacity: 0.6;
  transition: opacity 0.2s;
}

.error-banner__dismiss:hover {
  opacity: 1;
}