.tool-page {
  max-width: 1000px;
  margin: 0 auto;
}

.tool-header {
  margin-bottom: 2rem;
}

.tool-header h1 {
  margin: 0 0 0.5rem;
  color: var(--main);
}

.tool-header p {
  margin: 0;
  color: var(--text-muted);
}

.tool-panel {
  padding: 1.5rem;
  background: var(--panel-background);
  border: 1px solid var(--border);
}

.cidr-input-row {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
}

.cidr-input-row .tool-field {
  flex: 1 1 auto;
  min-width: 0;
}

.cidr-prefix-field {
  flex: 0 0 140px;
}

.tool-field {
  margin-bottom: 1rem;
}

.tool-field label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text);
  font-weight: 700;
}

.tool-field input,
.tool-field select {
  width: 100%;
  box-sizing: border-box;
  padding: 0.75rem;
  border: 1px solid var(--border);
  background: var(--page-background);
  color: var(--text);
  font: inherit;
}

.tool-field input:focus,
.tool-field select:focus {
  outline: 2px solid var(--main);
  outline-offset: 1px;
  border-color: var(--main);
}

.tool-field input::placeholder {
  color: var(--text-muted-dark);
  opacity: 1;
}

.tool-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
}

.cidr-results {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.cidr-result {
  padding: 1rem;
  background: var(--panel-background);
  border: 1px solid var(--border);
}

.cidr-result-label {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.cidr-result-value {
  display: block;
  color: var(--text);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  font-size: 1.05rem;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.cidr-result:first-child .cidr-result-value {
  color: var(--main);
}

.tool-error {
  margin: 1rem 0 0;
  padding: 0.9rem 1rem;
  border-left: 4px solid var(--error);
  background: var(--surface-background);
  color: var(--text-dark);
  font-weight: 600;
}

@media (max-width: 700px) {
  .cidr-input-row {
    flex-direction: column;
    gap: 0;
  }

  .cidr-prefix-field {
    flex: none;
  }

  .cidr-results {
    grid-template-columns: 1fr;
  }

  .tool-actions {
    flex-direction: column;
  }

  .tool-actions .tool-button {
    width: 100%;
  }
}