/* OFB-F035 — two-site comparison surface.
   Mobile-first and single-column throughout: spec §5 requires the semantic
   pairing of the two sites to survive a narrow viewport, so nothing here forces
   a two-column desktop table into a phone. The two sides become side-by-side
   only from the md breakpoint up, where there is room for both. */

.compare-page {
  width: min(var(--container-default), calc(100% - 2 * var(--space-5)));
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 4.5rem) 0 var(--space-9);
}

.compare-page h1 {
  margin: 0 0 var(--space-3);
  font-size: var(--type-scale-page-title);
  line-height: var(--line-height-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.compare-page__intro {
  max-width: 62ch;
  margin: 0 0 var(--space-6);
  color: var(--text-muted);
  font-size: var(--type-scale-lead);
  line-height: var(--line-height-body);
}

/* Form ------------------------------------------------------------------ */

.compare-form {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-5);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-card);
  background: var(--surface-panel);
  box-shadow: var(--shadow-card);
}

.compare-form label {
  font-size: var(--type-scale-small);
  font-weight: var(--font-weight-medium);
  color: var(--color-ink);
}

.compare-form input {
  width: 100%;
  min-height: var(--control-height-md);
  padding: 0 var(--space-4);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-control);
  background: var(--color-surface);
  color: var(--color-ink);
  font: inherit;
}

.compare-form input:focus-visible,
.compare-group__toggle:focus-visible,
.compare-row > summary:focus-visible {
  outline: 2px solid var(--focus-ring-color);
  outline-offset: 2px;
}

.compare-form label + input {
  margin-bottom: var(--space-3);
}

.compare-form button[type='submit'] {
  justify-self: start;
  margin-top: var(--space-2);
}

/* Status, pending, and failure states ------------------------------------ */

.compare-status {
  margin: var(--space-4) 0 0;
  min-height: 1.25em;
  color: var(--text-muted);
  font-size: var(--type-scale-small);
}

.compare-pending {
  margin: var(--space-4) 0 0;
  color: var(--text-muted);
}

.compare-error,
.compare-incompatible {
  margin: var(--space-5) 0 0;
  padding: var(--space-4);
  border: 1px solid var(--color-critical-border);
  border-radius: var(--radius-card);
  background: var(--color-critical-soft);
  color: var(--color-critical);
  line-height: var(--line-height-body);
}

.compare-incompatible {
  border-color: var(--color-neutral-border);
  background: var(--color-neutral-soft);
  color: var(--color-ink-soft);
}

/* Header: the two labelled sites and their methodology versions ---------- */

.compare-header {
  display: grid;
  gap: var(--space-3);
  margin: var(--space-6) 0 var(--space-5);
}

.compare-header__side {
  padding: var(--space-4);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-card);
  background: var(--surface-panel);
}

.compare-header__label {
  margin: 0 0 var(--space-1);
  font-size: var(--type-scale-caption);
  font-weight: var(--font-weight-medium);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--text-muted);
}

.compare-header__domain {
  margin: 0;
  overflow-wrap: anywhere;
  font-size: var(--text-lg);
  font-weight: var(--font-weight-medium);
  color: var(--color-ink);
}

.compare-header__methodology {
  margin: var(--space-2) 0 0;
  overflow-wrap: anywhere;
  font-family: var(--font-mono);
  font-size: var(--type-scale-caption);
  color: var(--text-muted);
}
.compare-header__details {
  grid-column: 1 / -1;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-control);
  background: var(--color-surface-subtle);
}
.compare-header__details > summary { min-height: 44px; padding: var(--space-3) var(--space-4); color: var(--color-ink); font-size: var(--type-scale-small); font-weight: var(--font-weight-medium); cursor: pointer; }
.compare-header__details dl { display: grid; gap: var(--space-2); margin: 0; padding: 0 var(--space-4) var(--space-4); }
.compare-header__details dl > div { min-width: 0; }
.compare-header__details dt { font-size: var(--type-scale-caption); font-weight: var(--font-weight-bold); color: var(--color-ink); }
.compare-header__details dd { margin: 2px 0 0; overflow-wrap: anywhere; font-family: var(--font-mono); font-size: var(--type-scale-caption); color: var(--text-muted); }

/* Groups ----------------------------------------------------------------- */

.compare-group {
  margin: 0 0 var(--space-5);
}

.compare-group__title {
  margin: 0 0 var(--space-3);
  font-size: var(--type-scale-h2);
  line-height: var(--line-height-heading);
  color: var(--color-ink);
}

button.compare-group__toggle {
  display: flex;
  width: 100%;
  min-height: 52px;
  align-items: center;
  gap: var(--space-2);
  justify-content: flex-start;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-control);
  background: var(--surface-panel);
  color: var(--color-ink);
  box-shadow: none;
  font: inherit;
  font-size: var(--type-scale-h3);
  text-align: left;
  cursor: pointer;
}

button.compare-group__toggle::after {
  content: '▸';
  margin-left: auto;
  font-size: 0.8em;
  color: var(--color-accent);
  transition: transform var(--motion-duration-fast) var(--motion-easing-standard);
}

button.compare-group__toggle:hover {
  border-color: var(--border-emphasis);
  background: var(--color-surface-subtle);
  color: var(--color-ink);
  transform: none;
}

button.compare-group__toggle:active {
  transform: none;
}

button.compare-group__toggle[aria-expanded='true']::after {
  transform: rotate(90deg);
}

.compare-group__count {
  display: inline-grid;
  min-width: 1.75rem;
  height: 1.75rem;
  place-items: center;
  padding: 0 var(--space-2);
  border: 1px solid var(--color-neutral-border);
  border-radius: 999px;
  background: var(--color-neutral-soft);
  color: var(--color-ink-soft);
  font-size: var(--type-scale-caption);
  font-weight: var(--font-weight-bold);
  line-height: 1;
}

.compare-group__rows {
  display: grid;
  gap: var(--space-2);
}

/* Rows ------------------------------------------------------------------- */

.compare-row {
  border: 1px solid var(--border-default);
  border-radius: var(--radius-card);
  background: var(--surface-panel);
  padding: var(--space-4);
}

.compare-row h3 { margin: 0 0 10px; font-size: var(--type-scale-h3); }
.compare-row .compare-row__explanation { padding: 0; margin-bottom: 14px; }
.compare-decision { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.compare-decision__side { display: grid; align-content: start; gap: 7px; min-width: 0; }
.compare-decision__side p { margin: 0; font-size: .875rem; color: var(--text-muted); overflow-wrap: anywhere; }
.compare-row__evidence > summary, .compare-gap-plan__more > summary { padding: 12px 0; min-height: 44px; color: var(--color-accent); font-size: .875rem; font-weight: 600; cursor: pointer; }
.compare-row__evidence .compare-evidence { padding: 0; }
.compare-overview { background: var(--color-accent-soft); padding: var(--space-5); border-radius: var(--radius-card); margin-bottom: var(--space-5); }
.compare-overview h2 { margin: 0 0 8px; font-size: var(--type-scale-h2); }
.compare-overview p { margin: 0; color: var(--text-muted); }
.compare-overview__counts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-3); margin-top: var(--space-4); }
.compare-overview__card { display: flex; align-items: center; gap: var(--space-3); min-width: 0; padding: var(--space-3); border: 1px solid var(--color-neutral-border); border-radius: var(--radius-control); background: var(--color-surface); }
.compare-overview__card--attention { border-color: var(--color-critical-border); background: var(--color-critical-soft); color: var(--color-critical); }
.compare-overview__card--strong { border-color: var(--color-strong-border); background: var(--color-strong-soft); color: var(--color-strong); }
.compare-overview__card--review { border-color: var(--color-opportunity-border); background: var(--color-opportunity-soft); color: var(--color-opportunity); }
.compare-overview__card--unknown { color: var(--color-neutral); }
.compare-overview__icon { display: inline-grid; flex: 0 0 auto; width: 28px; height: 28px; place-items: center; border: 1px solid currentColor; border-radius: 50%; font-weight: var(--font-weight-bold); }
.compare-overview__label, .compare-overview__value { display: block; }
.compare-overview__label { font-size: var(--type-scale-small); font-weight: var(--font-weight-bold); color: currentColor; }
.compare-overview__value { margin-top: 2px; font-size: var(--type-scale-caption); color: var(--text-muted); }
.compare-overview__value strong { color: var(--color-ink); font-size: var(--type-scale-body); }
.compare-header__methodology { font-family: var(--font-sans); }
@media (max-width: 520px) { .compare-overview__counts, .compare-decision { grid-template-columns: 1fr; } }

.compare-row > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2) var(--space-4);
  padding: var(--space-4);
  cursor: pointer;
  list-style: none;
}

.compare-row > summary::-webkit-details-marker {
  display: none;
}

.compare-row__title {
  flex: 1 1 16ch;
  min-width: 0;
  font-weight: var(--font-weight-medium);
  color: var(--color-ink);
}

.compare-row__states {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
}

.compare-row__vs {
  font-size: var(--type-scale-caption);
  color: var(--text-muted);
}

.compare-pill {
  display: inline-block;
  padding: 2px var(--space-3);
  border: 1px solid var(--color-neutral-border);
  border-radius: var(--radius-pill);
  background: var(--color-neutral-soft);
  color: var(--color-ink-soft);
  font-size: var(--type-scale-caption);
  white-space: nowrap;
}

.compare-pill--primary {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
  color: var(--color-accent);
}

.compare-row__explanation {
  margin: 0;
  padding: 0 var(--space-4) var(--space-4);
  color: var(--color-ink-soft);
  line-height: var(--line-height-body);
}

/* Evidence drill-down ---------------------------------------------------- */

.compare-evidence {
  display: grid;
  gap: var(--space-3);
  padding: 0 var(--space-4) var(--space-4);
}

.compare-evidence__side {
  padding: var(--space-3);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  background: var(--surface-subtle);
}

.compare-evidence__label {
  margin: 0 0 var(--space-2);
  font-size: var(--type-scale-caption);
  font-weight: var(--font-weight-medium);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--text-muted);
}

.compare-evidence__list {
  display: grid;
  gap: var(--space-2);
  margin: 0;
}

.compare-evidence__row {
  display: grid;
  gap: 2px;
}

.compare-evidence__row dt {
  font-size: var(--type-scale-caption);
  color: var(--text-muted);
}

.compare-evidence__row dd {
  margin: 0;
  overflow-wrap: anywhere;
  white-space: pre-wrap;
  font-size: var(--type-scale-small);
  color: var(--color-ink-soft);
}

/* Competitive gap plan --------------------------------------------------- */

.compare-gap-plan {
  padding: var(--space-5);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-card);
  background: var(--color-accent-soft);
}

.compare-gap-plan__intro {
  margin: 0 0 var(--space-4);
  max-width: 70ch;
  color: var(--color-ink-soft);
  font-size: var(--type-scale-small);
  line-height: var(--line-height-body);
}

.compare-gap-plan__list {
  display: grid;
  gap: var(--space-3);
  margin: 0;
  padding-left: var(--space-5);
}

.compare-gap {
  padding: var(--space-4);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  background: var(--surface-panel);
}

.compare-gap__title {
  margin: 0 0 var(--space-2);
  font-weight: var(--font-weight-medium);
  color: var(--color-ink);
}

.compare-gap__action,
.compare-gap__verify,
.compare-gap__explanation,
.compare-gap__link {
  margin: 0 0 var(--space-2);
  color: var(--color-ink-soft);
  line-height: var(--line-height-body);
}

.compare-gap__verify,
.compare-gap__explanation {
  font-size: var(--type-scale-small);
  color: var(--text-muted);
}

.compare-gap__link {
  font-size: var(--type-scale-small);
  margin-bottom: 0;
}

.compare-gap__link a {
  color: var(--color-accent);
}

/* From the md breakpoint up there is room to place the two sides beside each
   other; below it they stay stacked so each side keeps its own label. */
@media (min-width: 768px) {
  .compare-header,
  .compare-evidence {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .compare-form {
    padding: var(--space-6);
  }
}

@media (prefers-reduced-motion: reduce) {
  button.compare-group__toggle::after {
    transition: none;
  }
}