/* ==========================================================================
   Upgrade checker + guide pages. Loaded after styles.css, reuses its tokens.
   Mobile-first; breakpoints match styles.css (sm 40rem, md 48rem, lg 64rem).
   ========================================================================== */

:root {
  --color-warn: #fbbf24;
  --color-info: #93c5fd;
  --color-ok: var(--color-accent);
  --color-bad: var(--color-red-400);
}

/* ---------- Page shell ---------- */
.tool-page {
  padding-block: 2.5rem 4rem;
}
.breadcrumbs {
  font-size: 0.8125rem;
  line-height: var(--lh-sm);
  color: var(--color-ink-subtle);
}
.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
}
.breadcrumbs li + li::before {
  content: "/";
  margin-right: 0.375rem;
  color: var(--color-line-strong);
}
.breadcrumbs a {
  color: var(--color-ink-muted);
}
.breadcrumbs a:hover {
  color: var(--color-ink);
}
.tool-title {
  margin-top: 1.25rem;
  text-wrap: balance;
  font-size: 2rem;
  line-height: 1.15;
  font-weight: 600;
  letter-spacing: var(--tight);
}
.tool-lead {
  margin-top: 0.875rem;
  max-width: 44rem;
  font-size: 1.0625rem;
  line-height: var(--relaxed);
  color: var(--color-ink-muted);
}
@media (min-width: 48rem) {
  .tool-title {
    font-size: 2.75rem;
  }
}

/* ---------- Checker panel ---------- */
.checker {
  margin-top: 2rem;
  border-radius: var(--radius-card);
  border: 1px solid var(--color-line);
  background-color: var(--color-surface);
  padding: 1.25rem;
}
@media (min-width: 48rem) {
  .checker {
    padding: 1.75rem;
  }
}
.checker__grid {
  display: grid;
  gap: 1.25rem;
}
@media (min-width: 64rem) {
  .checker__grid {
    grid-template-columns: minmax(0, 1fr) 18rem;
    align-items: start;
  }
}
.checker__input {
  min-height: 16rem;
  tab-size: 2;
}
.checker__side > * + * {
  margin-top: 1rem;
}
.checker__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}
.checker__privacy {
  margin-top: 0.75rem;
  font-size: 0.75rem;
  line-height: var(--relaxed);
  color: var(--color-ink-subtle);
}
.file-drop {
  display: block;
  border-radius: var(--radius-lg);
  border: 1px dashed var(--color-line-strong);
  padding: 0.875rem;
  font-size: 0.875rem;
  color: var(--color-ink-muted);
  cursor: pointer;
}
.file-drop:hover,
.file-drop:focus-within {
  border-color: var(--color-accent-dim);
  color: var(--color-ink);
}
.file-drop input {
  margin-top: 0.5rem;
  width: 100%;
  font-size: 0.75rem;
}
select.field {
  appearance: none;
  background-image: linear-gradient(45deg, #0000 50%, var(--color-ink-subtle) 50%),
    linear-gradient(135deg, var(--color-ink-subtle) 50%, #0000 50%);
  background-position: calc(100% - 1.1rem) 55%, calc(100% - 0.8rem) 55%;
  background-size: 0.3rem 0.3rem;
  background-repeat: no-repeat;
  padding-right: 2rem;
}
.btn--primary:hover {
  background-color: #fff;
}
.btn--secondary:hover {
  border-color: var(--color-ink-subtle);
}

/* ---------- Results ---------- */
.results {
  margin-top: 2.5rem;
}
.results:focus {
  outline: none;
}
.results__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.results__title {
  font-size: 1.5rem;
  line-height: 1.25;
  font-weight: 600;
  letter-spacing: var(--tight);
}
.results__export {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.results__block {
  margin-top: 2rem;
}
.results__h {
  font-size: 1.125rem;
  line-height: var(--lh-lg);
  font-weight: 600;
}
.results__note {
  margin-top: 0.375rem;
  font-size: 0.8125rem;
  line-height: var(--relaxed);
  color: var(--color-ink-subtle);
}
.status-line {
  margin-top: 0.75rem;
  font-size: 0.875rem;
  color: var(--color-ink-muted);
}

.summary {
  margin-top: 1rem;
  display: grid;
  gap: 1px;
  overflow: hidden;
  border-radius: var(--radius-card);
  border: 1px solid var(--color-line);
  background-color: var(--color-line);
  grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr));
}
.summary__item {
  background-color: var(--color-surface);
  padding: 0.875rem 1rem;
}
.summary__label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-ink-subtle);
}
.summary__value {
  margin-top: 0.25rem;
  overflow-wrap: anywhere;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-ink);
}

.counts {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  border-radius: 9999px;
  border: 1px solid currentcolor;
  padding: 0.125rem 0.625rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.5;
  white-space: nowrap;
}
.badge::before {
  content: "";
  width: 0.4rem;
  height: 0.4rem;
  border-radius: 9999px;
  background-color: currentcolor;
}
.badge--mismatch {
  color: var(--color-bad);
}
.badge--verify {
  color: var(--color-warn);
}
.badge--unknown {
  color: var(--color-info);
}
.badge--compatible {
  color: var(--color-ok);
}
.badge--info {
  color: var(--color-ink-muted);
}

.findings {
  margin-top: 0.75rem;
  display: grid;
  /* minmax(0, …) lets long commands scroll inside .cmd instead of widening the page. */
  grid-template-columns: minmax(0, 1fr);
  gap: 0.75rem;
}
.finding {
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-line);
  border-left-width: 3px;
  background-color: var(--color-surface);
  padding: 0.875rem 1rem;
}
.finding--mismatch {
  border-left-color: var(--color-bad);
}
.finding--verify {
  border-left-color: var(--color-warn);
}
.finding--unknown {
  border-left-color: var(--color-info);
}
.finding--compatible {
  border-left-color: var(--color-ok);
}
.finding--info {
  border-left-color: var(--color-line-strong);
}
.finding__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
}
.finding__title {
  font-size: 0.9375rem;
  font-weight: 600;
  overflow-wrap: anywhere;
}
.finding__versions {
  margin-top: 0.375rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-ink-muted);
  overflow-wrap: anywhere;
}
.finding__reasons {
  margin-top: 0.5rem;
  display: grid;
  gap: 0.25rem;
  font-size: 0.875rem;
  line-height: var(--relaxed);
  color: var(--color-ink-muted);
}
.finding__fix {
  margin-top: 0.5rem;
}
.finding__sources {
  margin-top: 0.5rem;
  font-size: 0.75rem;
  color: var(--color-ink-subtle);
}
.finding__sources a {
  text-decoration: underline;
  text-underline-offset: 3px;
}
.empty-state {
  margin-top: 0.75rem;
  font-size: 0.875rem;
  color: var(--color-ink-subtle);
}
.compatible-list summary {
  cursor: pointer;
  margin-top: 0.75rem;
  font-size: 0.875rem;
  color: var(--color-ink-muted);
}

.cmd {
  display: block;
  overflow-x: auto;
  border-radius: 0.375rem;
  border: 1px solid var(--color-line);
  background-color: var(--color-canvas);
  padding: 0.5rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.6;
  white-space: pre;
  color: var(--color-ink);
}

.steps-list {
  margin-top: 0.75rem;
  counter-reset: step;
  display: grid;
  gap: 1rem;
}
.steps-list > li {
  counter-increment: step;
  position: relative;
  padding-left: 2.25rem;
}
.steps-list > li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  display: grid;
  place-items: center;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 9999px;
  border: 1px solid var(--color-accent-dim);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-accent);
}
.steps-list__title {
  font-weight: 600;
  font-size: 0.9375rem;
}
.steps-list__detail {
  margin-top: 0.25rem;
  font-size: 0.875rem;
  line-height: var(--relaxed);
  color: var(--color-ink-muted);
}
.steps-list .cmd {
  margin-top: 0.5rem;
}
.steps-list__links {
  margin-top: 0.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
  font-size: 0.8125rem;
}

.meter {
  margin-top: 0.75rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-line);
  background-color: var(--color-surface);
  padding: 1rem;
}
.meter__row {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}
.meter__score {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 600;
}
.meter__label {
  font-size: 0.875rem;
  text-transform: capitalize;
}
.meter__label--low {
  color: var(--color-ok);
}
.meter__label--moderate {
  color: var(--color-warn);
}
.meter__label--high {
  color: var(--color-bad);
}
.meter__rules {
  margin-top: 0.75rem;
  display: grid;
  gap: 0.25rem;
  font-size: 0.8125rem;
  color: var(--color-ink-muted);
}
.meter__rules li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}
.meter__rules span:last-child {
  font-family: var(--font-mono);
  white-space: nowrap;
}

/* ---------- Help CTA + lead form ---------- */
.help-cta {
  margin-top: 3rem;
  border-radius: var(--radius-card);
  border: 1px solid var(--color-accent-dim);
  background-color: var(--color-surface-raised);
  padding: 1.5rem;
}
.help-cta__title {
  font-size: 1.375rem;
  line-height: 1.3;
  font-weight: 600;
}
.help-cta__text {
  margin-top: 0.5rem;
  max-width: 40rem;
  font-size: 0.9375rem;
  line-height: var(--relaxed);
  color: var(--color-ink-muted);
}
.help-cta__actions {
  margin-top: 1.25rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.lead-form {
  margin-top: 1.5rem;
  border-top: 1px solid var(--color-line);
  padding-top: 1.5rem;
}
.lead-form > * + * {
  margin-top: 1.125rem;
}
@media (min-width: 48rem) {
  .lead-form__pair {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.125rem;
  }
}
.lead-form__pair > * + * {
  margin-top: 1.125rem;
}
@media (min-width: 48rem) {
  .lead-form__pair > * + * {
    margin-top: 0;
  }
}
.check {
  display: flex;
  gap: 0.625rem;
  align-items: flex-start;
  font-size: 0.875rem;
  line-height: var(--relaxed);
  color: var(--color-ink-muted);
}
.check input {
  margin-top: 0.3rem;
  accent-color: var(--color-accent);
}
.form-ok {
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-accent-dim);
  padding: 0.625rem 0.875rem;
  font-size: 0.875rem;
  color: var(--color-accent);
}

/* ---------- Guide pages (prose) ---------- */
.prose {
  margin-top: 2.5rem;
  max-width: 46rem;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-ink-muted);
}
.prose > * + * {
  margin-top: 1rem;
}
.prose h2 {
  margin-top: 2.75rem;
  font-size: 1.5rem;
  line-height: 1.3;
  font-weight: 600;
  letter-spacing: var(--tight);
  color: var(--color-ink);
}
.prose h3 {
  margin-top: 2rem;
  font-size: 1.125rem;
  line-height: 1.4;
  font-weight: 600;
  color: var(--color-ink);
}
.prose strong {
  color: var(--color-ink);
  font-weight: 600;
}
.prose a {
  color: var(--color-ink);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-dim);
  text-underline-offset: 3px;
}
.prose a:hover {
  text-decoration-color: var(--color-accent);
}
.prose ul,
.prose ol {
  padding-left: 1.25rem;
}
.prose ul {
  list-style: disc;
}
.prose ol {
  list-style: decimal;
}
.prose li + li {
  margin-top: 0.375rem;
}
.prose li::marker {
  color: var(--color-ink-subtle);
}
.prose code {
  border-radius: 0.25rem;
  background-color: var(--color-surface-raised);
  padding: 0.1rem 0.3rem;
  font-size: 0.875em;
  color: var(--color-ink);
}
.prose pre {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-line);
  background-color: var(--color-surface);
  padding: 0.875rem 1rem;
  font-size: 0.8125rem;
  line-height: 1.65;
}
.prose pre code {
  background: none;
  padding: 0;
}
.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-line);
}
.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
.prose th,
.prose td {
  border-bottom: 1px solid var(--color-line);
  padding: 0.5rem 0.75rem;
  text-align: left;
  white-space: nowrap;
}
.prose th {
  font-weight: 600;
  color: var(--color-ink);
  background-color: var(--color-surface);
}
.prose tr:last-child td {
  border-bottom: 0;
}
.prose td {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}
.callout {
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-line-strong);
  background-color: var(--color-surface-raised);
  padding: 1rem 1.125rem;
}
.callout .btn {
  margin-top: 0.75rem;
}
.prose .callout a.btn {
  text-decoration: none;
}
.faq-list details {
  border-bottom: 1px solid var(--color-line);
  padding-block: 0.875rem;
}
.faq-list summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--color-ink);
}
.faq-list details > p {
  margin-top: 0.5rem;
}
.related {
  margin-top: 3rem;
  display: grid;
  gap: 0.75rem;
}
@media (min-width: 48rem) {
  .related {
    grid-template-columns: repeat(3, 1fr);
  }
}
.related a {
  display: block;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-line);
  background-color: var(--color-surface);
  padding: 1rem;
  font-size: 0.875rem;
  color: var(--color-ink-muted);
}
.related a:hover {
  border-color: var(--color-line-strong);
}
.related strong {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--color-ink);
}

/* ---------- Print: report only ---------- */
@media print {
  .site-header,
  .site-footer,
  .breadcrumbs,
  .checker,
  .results__export,
  .help-cta,
  .prose,
  .related,
  .skip-link,
  .grid-bg {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
  .finding,
  .summary__item,
  .meter,
  .cmd {
    background: #fff !important;
    color: #000 !important;
    border-color: #999 !important;
  }
  .finding,
  .steps-list > li {
    break-inside: avoid;
  }
  .summary__value,
  .finding__reasons,
  .finding__versions,
  .steps-list__detail,
  .meter__rules,
  .results__note {
    color: #222 !important;
  }
}