:root {
  color-scheme: light;
  --bg: #ffffff;
  --surface: #f7f9fc;
  --surface-strong: #eef3f8;
  --ink: #111827;
  --muted: #5b6678;
  --line: #cbd5e1;
  --line-soft: #e3e8ef;
  --blue: #1261e8;
  --blue-dark: #0a49b8;
  --green: #167344;
  --amber: #a85d00;
  --red: #ba2727;
  --radius: 10px;
  --shadow: 0 1px 2px rgb(15 23 42 / 5%);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; background: var(--bg); }
button, input, textarea, select { font: inherit; }
button, a, input, textarea, select { -webkit-tap-highlight-color: transparent; }
a { color: inherit; }

.skip-link {
  position: fixed;
  left: 16px;
  top: 12px;
  z-index: 10;
  transform: translateY(-150%);
  padding: 8px 12px;
  border-radius: 7px;
  background: var(--ink);
  color: white;
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  min-height: 60px;
  padding: 0 30px;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  background: rgb(255 255 255 / 96%);
  position: sticky;
  top: 0;
  z-index: 5;
}
.brand { font-size: 19px; font-weight: 780; text-decoration: none; letter-spacing: -0.02em; }
nav { display: flex; align-items: stretch; gap: 10px; align-self: stretch; }
nav a { display: grid; place-items: center; min-width: 78px; padding: 0 12px; text-decoration: none; border-bottom: 3px solid transparent; font-size: 14px; font-weight: 650; }
nav a:hover, nav a:focus-visible, nav a.active { color: var(--blue); border-bottom-color: var(--blue); outline: none; }

main { width: min(1380px, calc(100% - 52px)); margin: 0 auto; }
.intro { padding: 34px 2px 22px; }
.intro h1 { max-width: 880px; margin: 0; font-size: clamp(34px, 3.2vw, 52px); line-height: 1.03; letter-spacing: -0.045em; }
.intro p { max-width: 820px; margin: 12px 0 0; color: var(--muted); font-size: 16px; line-height: 1.55; }

.workspace { display: grid; grid-template-columns: minmax(330px, 0.78fr) minmax(520px, 1.42fr); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
.contract-panel, .suite-panel { padding: 24px; }
.contract-panel { border-right: 1px solid var(--line); background: var(--surface); }
.suite-panel { background: white; }
.section-heading { margin-bottom: 19px; }
.section-heading h2, .validation-result h2 { margin: 0; font-size: 19px; line-height: 1.25; letter-spacing: -0.02em; }
.section-heading p { margin: 5px 0 0; color: var(--muted); font-size: 13px; line-height: 1.45; }

label { display: block; margin: 14px 0 6px; font-size: 13px; font-weight: 700; }
input, textarea, select {
  width: 100%;
  border: 1px solid #b8c3d1;
  border-radius: 7px;
  background: white;
  color: var(--ink);
  padding: 10px 12px;
  font-size: 14px;
  line-height: 1.45;
  transition: border-color 120ms ease, box-shadow 120ms ease;
}
textarea { resize: vertical; min-height: 44px; }
#desired-outcome { min-height: 84px; }
#approval-point, #side-effect { min-height: 92px; }
input:focus, textarea:focus, select:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgb(18 97 232 / 14%); outline: none; }

.form-actions, .validator-actions { display: flex; align-items: center; gap: 10px; margin-top: 18px; }
button { min-height: 42px; border-radius: 7px; padding: 9px 16px; border: 1px solid transparent; font-size: 13px; font-weight: 760; cursor: pointer; transition: background 120ms ease, border-color 120ms ease, transform 120ms ease; }
button:hover:not(:disabled) { transform: translateY(-1px); }
button:focus-visible { outline: 3px solid rgb(18 97 232 / 24%); outline-offset: 2px; }
button:disabled { cursor: not-allowed; opacity: 0.48; }
.primary { background: var(--blue); color: white; border-color: var(--blue); }
.primary:hover:not(:disabled) { background: var(--blue-dark); border-color: var(--blue-dark); }
.secondary { background: white; color: var(--ink); border-color: #aeb9c8; }
.secondary:hover:not(:disabled) { border-color: var(--blue); color: var(--blue); }
.form-actions button { flex: 1; }

.suite-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; }
.suite-heading .download { flex: 0 0 auto; }
.test-list { list-style: none; margin: 0; padding: 0; border: 1px solid var(--line-soft); border-radius: 8px; overflow: hidden; }
.test-row { display: grid; grid-template-columns: 28px minmax(130px, 0.64fr) minmax(200px, 1.35fr) auto; align-items: center; gap: 14px; min-height: 61px; padding: 10px 14px 10px 18px; border-bottom: 1px solid var(--line-soft); position: relative; }
.test-row:last-child { border-bottom: 0; }
.test-row::before { content: ""; position: absolute; inset: 10px auto 10px 0; width: 4px; background: var(--blue); }
.test-number { font-variant-numeric: tabular-nums; color: var(--muted); font-size: 12px; }
.test-name { font-size: 14px; font-weight: 760; }
.test-description { color: var(--muted); font-size: 12px; line-height: 1.42; }
.test-file { color: #344156; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 11px; white-space: nowrap; }

.validator { margin-top: 14px; border: 1px solid var(--line); border-radius: var(--radius); display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(300px, 0.55fr); box-shadow: var(--shadow); overflow: hidden; }
.validator-input, .validation-result { padding: 22px 24px; }
.validator-input { background: white; }
.validator-input textarea { min-height: 220px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px; background: var(--surface); border-style: dashed; }
.validator-input textarea.dragging { border-color: var(--blue); background: #f1f6ff; }
.validator-actions { flex-wrap: wrap; }
.validator-actions span { color: var(--muted); font-size: 11px; margin-left: auto; }
.validation-result { border-left: 1px solid var(--line); background: var(--surface); }
.validation-result h2 { margin-bottom: 18px; }
.result-count { display: grid; grid-template-columns: 44px 1fr; align-items: center; min-height: 58px; margin-bottom: 9px; padding: 8px 12px; border: 1px solid var(--line-soft); border-radius: 8px; background: white; }
.result-count strong { font-size: 23px; font-variant-numeric: tabular-nums; }
.result-count span { font-size: 14px; font-weight: 740; }
.result-count.pass { color: var(--green); }
.result-count.review { color: var(--amber); }
.result-count.fail { color: var(--red); }
#validation-details { margin: 16px 0 0; padding-left: 18px; color: var(--muted); font-size: 11px; line-height: 1.55; }

.paid-kit-rail {
  margin-top: 14px;
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 28px;
}
.paid-kit-rail h2 { margin: 0; font-size: 19px; line-height: 1.25; letter-spacing: -0.02em; }
.paid-kit-rail p { max-width: 780px; margin: 6px 0 0; color: var(--muted); font-size: 13px; line-height: 1.5; }
.paid-kit-action { display: grid; justify-items: stretch; gap: 7px; min-width: 230px; }
.interest-link {
  min-height: 42px;
  padding: 10px 16px;
  border: 1px solid var(--blue);
  border-radius: 7px;
  background: var(--blue);
  color: white;
  display: grid;
  place-items: center;
  font-size: 13px;
  font-weight: 760;
  text-align: center;
  text-decoration: none;
  transition: background 120ms ease, border-color 120ms ease, transform 120ms ease;
}
.interest-link:hover { background: var(--blue-dark); border-color: var(--blue-dark); transform: translateY(-1px); }
.interest-link:focus-visible { outline: 3px solid rgb(18 97 232 / 24%); outline-offset: 2px; }
.interest-link.secondary-interest { background: white; color: var(--blue); }
.interest-link.secondary-interest:hover { background: #f3f7ff; border-color: var(--blue-dark); color: var(--blue-dark); }
.paid-kit-action span { color: var(--muted); font-size: 10px; line-height: 1.4; text-align: center; }

footer { min-height: 78px; width: min(1380px, calc(100% - 52px)); margin: 0 auto; display: flex; align-items: center; justify-content: center; gap: 16px; color: var(--muted); font-size: 12px; text-align: center; }
footer p { margin: 0; }
footer a { color: var(--blue); text-underline-offset: 3px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

@media (max-width: 980px) {
  main, footer { width: min(100% - 28px, 760px); }
  .workspace, .validator { grid-template-columns: 1fr; }
  .contract-panel { border-right: 0; border-bottom: 1px solid var(--line); }
  .validation-result { border-left: 0; border-top: 1px solid var(--line); }
  .test-row { grid-template-columns: 24px minmax(130px, 0.7fr) minmax(180px, 1.3fr); }
  .test-file { grid-column: 2 / -1; }
  .paid-kit-rail { grid-template-columns: 1fr; gap: 16px; }
  .paid-kit-action { min-width: 0; justify-items: start; }
  .interest-link { min-width: 230px; }
}

@media (max-width: 620px) {
  .site-header { min-height: 54px; padding: 0 16px; }
  .brand { font-size: 16px; }
  nav { gap: 0; }
  nav a { min-width: auto; padding: 0 9px; font-size: 12px; }
  .intro { padding: 27px 0 18px; }
  .intro h1 { font-size: 36px; }
  .contract-panel, .suite-panel, .validator-input, .validation-result { padding: 19px 16px; }
  .suite-heading { display: grid; }
  .suite-heading .download { width: 100%; }
  .test-row { grid-template-columns: 22px 1fr; gap: 6px 10px; padding: 12px 12px 12px 16px; }
  .test-description, .test-file { grid-column: 2; white-space: normal; }
  .form-actions, .validator-actions { align-items: stretch; flex-direction: column; }
  .form-actions button, .validator-actions button { width: 100%; }
  .validator-actions span { margin: 2px 0 0; }
  .paid-kit-rail { padding: 19px 16px; }
  .paid-kit-action, .interest-link { width: 100%; }
  footer { min-height: 92px; flex-direction: column; gap: 6px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}