#bitandburn-app {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px;
  color: #f5f5f5;
  font-family: inherit;
}

#bitandburn-app * {
  box-sizing: border-box;
}

#bitandburn-app .bb-hidden {
  display: none !important;
}

#bitandburn-app .bb-chooser {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

#bitandburn-app .bb-chooser-grid {
  display: flex;
  gap: 80px;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
}

#bitandburn-app .bb-choice {
  background: transparent;
  border: none;
  color: inherit;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 16px;
  min-width: 180px;
}

#bitandburn-app .bb-choice img {
  width: 80px;
  height: 80px;
  object-fit: contain;
  display: block;
  margin-bottom: 18px;
}

#bitandburn-app .bb-choice-label {
  font-size: 1.1rem;
  font-weight: 600;
}

#bitandburn-app .bb-choice:focus-visible,
#bitandburn-app .bb-action-btn:focus-visible,
#bitandburn-app .bb-back-btn:focus-visible,
#bitandburn-app .bb-copy-btn:focus-visible {
  outline: 3px solid #ffffff;
  outline-offset: 4px;
}

#bitandburn-app .bb-panel {
  max-width: 720px;
  margin: 40px auto 0 auto;
  padding: 10px 0;
}

#bitandburn-app .bb-panel h2 {
  margin-top: 0;
  margin-bottom: 12px;
  font-size: 1.5rem;
}

#bitandburn-app .bb-instruction {
  margin-bottom: 20px;
  color: #e4e4e4;
}

#bitandburn-app .bb-field,
#bitandburn-app .bb-textarea {
  width: 100%;
  border: 1px solid #777;
  background: #222;
  color: #fff;
  padding: 14px 16px;
  border-radius: 8px;
  font: inherit;
}

#bitandburn-app .bb-textarea {
  min-height: 180px;
  resize: vertical;
}

#bitandburn-app .bb-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 16px;
}

#bitandburn-app .bb-action-btn,
#bitandburn-app .bb-back-btn,
#bitandburn-app .bb-copy-btn {
  border: 1px solid #999;
  background: #444;
  color: #fff;
  padding: 12px 18px;
  border-radius: 8px;
  cursor: pointer;
  font: inherit;
}

#bitandburn-app .bb-action-btn:hover,
#bitandburn-app .bb-back-btn:hover,
#bitandburn-app .bb-copy-btn:hover {
  background: #555;
}

#bitandburn-app .bb-result,
#bitandburn-app .bb-message-box,
#bitandburn-app .bb-error-box {
  margin-top: 24px;
  padding: 16px;
  border-radius: 8px;
}

#bitandburn-app .bb-result,
#bitandburn-app .bb-message-box {
  border: 1px solid #777;
  background: #262626;
}

#bitandburn-app .bb-error-box {
  border: 1px solid #b55;
  background: #3a2020;
  color: #ffd7d7;
}

#bitandburn-app .bb-passphrase {
  margin-top: 12px;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.7;
  word-break: break-word;
}

#bitandburn-app .bb-muted {
  margin-top: 10px;
  color: #cccccc;
  font-size: 0.95rem;
}

#bitandburn-app .bb-status {
  margin-top: 14px;
  color: #ddd;
}

@media (max-width: 640px) {
  #bitandburn-app .bb-chooser-grid {
    gap: 24px;
    flex-direction: column;
  }

  #bitandburn-app .bb-choice img {
    width: 72px;
    height: 72px;
  }
}