/* The app's base layer: the design tokens and the shared component
   classes. Linked from index.html and probe.html above each page's own
   <style> block, so page styles win by cascade order. */

html {
  font-size: 19px;
  /* Reserve the scrollbar gutter so centred content doesn't jump sideways
     as the page grows past the viewport (e.g. expanders opening) */
  scrollbar-gutter: stable;
}

:root {
  --black: #111;
  --accent: #E70565;
  --accent-dark: #c40454;   /* hover state of accent-filled controls */
  --accent-darker: #a3033f; /* active state of accent-filled controls */
  --accent-tint: #fff0f5;   /* pale accent wash — error background, highlights */
  --grey-dark: #444;        /* hover state of black borders */
  --grey-mid: #767676;
  --grey-light: #e8e8e8;
  --grey-bg: #f5f5f5;
  --white: #fff;
  --font: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}

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

/* The hidden attribute must always win — without this, any component class
   that sets display (e.g. .button, .controls) silently overrides it */
[hidden] {
  display: none !important;
}

body {
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--black);
  background: var(--white);
  margin: 0;
  padding: 0;
}

main {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

h1 {
  font-size: 1.75rem;
  margin: 0 0 0.25rem;
}

h2 {
  font-size: 1.25rem;
  margin: 2rem 0 0.75rem;
}

.description {
  color: var(--grey-mid);
  margin: 0 0 2rem;
}

.description__link {
  color: var(--accent);
  text-underline-offset: 2px;
}

.description__link:hover {
  color: var(--black);
}

.description__link:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

/* Buttons */

.button {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.45em 1em;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.25;
  cursor: pointer;
  border: 2px solid var(--black);
  background: var(--white);
  color: var(--black);
  border-radius: 3px;
}

.button:hover {
  background: var(--grey-bg);
}

.button:active {
  background: var(--grey-light);
}

.button:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.button--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--white);
}

.button--primary:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
}

.button--primary:active {
  background: var(--accent-darker);
  border-color: var(--accent-darker);
}

/* Quiet secondary button — smaller, grey outline */

.button--ghost {
  padding: 0.3em 0.75em;
  font-size: 0.875rem;
  border-color: var(--grey-mid);
  color: var(--grey-mid);
}

.button--ghost:hover {
  border-color: var(--black);
  color: var(--black);
}

.button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

/* Form fields */

.field {
  margin-bottom: 1.25rem;
}

.field__label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.field__label-note {
  font-weight: 400;
  color: var(--grey-mid);
}

.field__hint {
  color: var(--grey-mid);
  font-size: 0.875rem;
  margin: 0.25rem 0 0.5rem;
}

.field__input,
.field__textarea,
.field__select {
  width: 100%;
  padding: 0.45em 0.6em;
  font-family: inherit;
  font-size: 1rem;
  color: var(--black);
  background: var(--white);
  border: 2px solid var(--black);
  border-radius: 3px;
}

.field__input:hover,
.field__textarea:hover,
.field__select:hover {
  border-color: var(--grey-dark);
}

.field__input:focus,
.field__textarea:focus,
.field__select:focus {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.field__textarea {
  height: 10rem;
  resize: vertical;
}

.field__textarea--mono {
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

/* Textarea with overlaid copy button */

.field__textarea-wrapper {
  position: relative;
}

.field__textarea--with-copy {
  padding-top: 2.75rem;
}

.field__copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  font-size: 0.8rem;
  padding: 0.25em 0.6em;
  border-color: var(--grey-mid);
}

.field__copy-btn:hover {
  border-color: var(--grey-mid);
}

/* Error */

.error {
  color: var(--accent);
  background: var(--accent-tint);
  border-left: 4px solid var(--accent);
  padding: 0.6rem 0.875rem;
  margin-bottom: 1rem;
  font-size: 0.9375rem;
}

/* Results section */

.results {
  margin-top: 1.5rem;
}