:root {
  --pilot-ink: #061b37;
  --pilot-text: #40526b;
  --pilot-brand: #007c9f;
  --pilot-accent: #19cff2;
  --pilot-line: #d9e4ee;
  --pilot-soft: #f3f9fc;
  --pilot-white: #ffffff;
  --pilot-success: #12633f;
  --pilot-error: #9d2f2f;
  --pilot-width: 1120px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--pilot-white);
  color: var(--pilot-ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

a {
  color: var(--pilot-brand);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--pilot-accent);
  outline-offset: 3px;
}

.pilot-skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 20;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--pilot-ink);
  color: var(--pilot-white);
  transform: translateY(-160%);
}

.pilot-skip-link:focus {
  transform: translateY(0);
}

.pilot-site-header {
  border-bottom: 1px solid var(--pilot-line);
  background: var(--pilot-white);
}

.pilot-site-header__inner {
  display: flex;
  width: min(var(--pilot-width), calc(100% - 40px));
  min-height: 76px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin: 0 auto;
}

.pilot-site-header__logo {
  display: block;
  width: auto;
  max-width: min(220px, 58vw);
  max-height: 52px;
}

.pilot-site-header__meta {
  color: var(--pilot-brand);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

.pilot-shell {
  width: min(var(--pilot-width), calc(100% - 40px));
  margin: 0 auto;
  padding: 34px 0 72px;
}

.pilot-breadcrumb {
  margin: 0 0 28px;
  color: var(--pilot-text);
  font-size: 0.9rem;
}

.pilot-breadcrumb a {
  font-weight: 800;
}

.pilot-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 48px;
  align-items: start;
}

.pilot-main {
  min-width: 0;
}

.pilot-eyebrow {
  display: block;
  margin: 0 0 12px;
  color: var(--pilot-brand);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

.pilot-main h1 {
  max-width: 800px;
  margin: 0;
  color: var(--pilot-ink);
  font-size: clamp(2.35rem, 4vw, 4rem);
  line-height: 1.04;
}

.pilot-lead {
  max-width: 760px;
  margin: 20px 0 0;
  color: var(--pilot-text);
  font-size: 1.1rem;
}

.pilot-notice {
  margin: 30px 0 0;
  padding: 20px 22px;
  border-left: 4px solid var(--pilot-accent);
  border-radius: 8px;
  background: var(--pilot-soft);
}

.pilot-notice strong {
  display: block;
  margin-bottom: 4px;
}

.pilot-actions,
.pilot-page-nav,
.pilot-progress-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0 0;
}

.pilot-progress-actions {
  padding-top: 24px;
  border-top: 1px solid var(--pilot-line);
}

.pilot-progress-summary {
  display: block;
  margin-top: 8px;
  color: var(--pilot-brand);
  font-size: 0.86rem;
  font-weight: 800;
}

.pilot-button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border: 1px solid var(--pilot-ink);
  border-radius: 8px;
  background: var(--pilot-ink);
  color: var(--pilot-white);
  font: inherit;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
}

.pilot-button--accent {
  border-color: var(--pilot-accent);
  background: var(--pilot-accent);
  color: var(--pilot-ink);
}

.pilot-button--secondary {
  background: var(--pilot-white);
  color: var(--pilot-ink);
}

.pilot-section {
  margin-top: 56px;
}

.pilot-section h2 {
  margin: 0;
  font-size: clamp(1.55rem, 2.5vw, 2.25rem);
  line-height: 1.15;
}

.pilot-section > p {
  max-width: 760px;
  color: var(--pilot-text);
}

.pilot-stat-grid,
.pilot-card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.pilot-stat,
.pilot-card {
  min-width: 0;
  padding: 22px;
  border: 1px solid var(--pilot-line);
  border-radius: 8px;
  background: var(--pilot-white);
}

.pilot-stat strong,
.pilot-card h3 {
  display: block;
  margin: 0;
  color: var(--pilot-ink);
  font-size: 1.05rem;
  line-height: 1.3;
}

.pilot-stat span,
.pilot-card p {
  display: block;
  margin: 8px 0 0;
  color: var(--pilot-text);
}

.pilot-sequence {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: pilot-step;
}

.pilot-sequence li {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 20px;
  border: 1px solid var(--pilot-line);
  border-radius: 8px;
  background: var(--pilot-white);
}

.pilot-sequence li::before {
  counter-increment: pilot-step;
  content: counter(pilot-step, decimal-leading-zero);
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 8px;
  background: var(--pilot-ink);
  color: var(--pilot-accent);
  font-size: 0.78rem;
  font-weight: 900;
}

.pilot-sequence strong,
.pilot-sequence span {
  display: block;
}

.pilot-sequence span {
  margin-top: 4px;
  color: var(--pilot-text);
}

.pilot-sidebar {
  position: sticky;
  top: 24px;
  padding: 22px;
  border: 1px solid var(--pilot-line);
  border-radius: 8px;
  background: var(--pilot-soft);
}

.pilot-sidebar h2 {
  margin: 0;
  font-size: 1.08rem;
}

.pilot-sidebar ul {
  display: grid;
  gap: 10px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.pilot-toc {
  display: grid;
  gap: 8px;
  margin: 16px 0 0;
  padding-left: 22px;
}

.pilot-toc li {
  color: var(--pilot-text);
}

.pilot-toc a {
  display: inline-block;
  line-height: 1.35;
}

.pilot-toc a[aria-current="page"] {
  color: var(--pilot-ink);
  text-decoration-thickness: 3px;
  text-underline-offset: 4px;
}

.pilot-sidebar a {
  font-weight: 800;
}

.pilot-sidebar p {
  margin: 18px 0 0;
  color: var(--pilot-text);
  font-size: 0.9rem;
}

.pilot-prose {
  max-width: 780px;
}

.pilot-prose h2 {
  margin-top: 48px;
}

.pilot-prose h3 {
  margin-top: 34px;
  font-size: 1.2rem;
}

.pilot-prose p,
.pilot-prose li {
  color: var(--pilot-text);
}

.pilot-prose code {
  padding: 0.1em 0.35em;
  border-radius: 4px;
  background: #e9f2f7;
  color: var(--pilot-ink);
  font-size: 0.92em;
}

.pilot-prose ul,
.pilot-prose ol {
  padding-left: 1.4rem;
}

.pilot-prose li + li {
  margin-top: 8px;
}

.pilot-prose blockquote {
  margin: 28px 0;
  padding: 18px 22px;
  border-left: 4px solid var(--pilot-accent);
  background: var(--pilot-soft);
}

.pilot-instructional-figure {
  width: 100%;
  max-width: 780px;
  margin: 32px 0;
}

.pilot-instructional-figure picture,
.pilot-instructional-figure img {
  display: block;
  width: 100%;
}

.pilot-instructional-figure img {
  height: auto;
  border: 1px solid var(--pilot-line);
  border-radius: 8px;
  background: var(--pilot-white);
  object-fit: contain;
}

.pilot-instructional-figure figcaption {
  max-width: 72ch;
  margin-top: 10px;
  color: var(--pilot-text);
  font-size: 0.92rem;
  line-height: 1.5;
}

.pilot-visual-description {
  margin-top: 12px;
  border-top: 1px solid var(--pilot-line);
}

.pilot-visual-description summary {
  padding: 12px 0;
  color: var(--pilot-brand);
  font-weight: 800;
  cursor: pointer;
}

.pilot-check {
  margin-top: 24px;
  padding: 24px;
  border: 1px solid var(--pilot-line);
  border-radius: 8px;
}

.pilot-inline-check {
  margin-top: 48px;
  padding: 24px;
  border: 1px solid var(--pilot-line);
  border-radius: 8px;
  background: var(--pilot-white);
}

.pilot-inline-check h2 {
  margin-top: 0;
}

.pilot-answer-reveal {
  margin-top: 20px;
  border: 1px solid var(--pilot-line);
  border-radius: 8px;
  background: var(--pilot-soft);
}

.pilot-answer-reveal summary {
  padding: 16px 18px;
  color: var(--pilot-ink);
  font-weight: 800;
  cursor: pointer;
}

.pilot-answer-reveal[open] summary {
  border-bottom: 1px solid var(--pilot-line);
}

.pilot-answer-reveal > :not(summary) {
  margin-left: 18px;
  margin-right: 18px;
}

.pilot-answer-reveal > :last-child {
  margin-bottom: 18px;
}

.pilot-answer-reveal--large {
  margin-top: 40px;
}

.pilot-table-wrap {
  max-width: 100%;
  margin: 24px 0;
  overflow-x: auto;
  border: 1px solid var(--pilot-line);
  border-radius: 8px;
}

.pilot-table-wrap table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  background: var(--pilot-white);
}

.pilot-table-wrap th,
.pilot-table-wrap td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--pilot-line);
  text-align: left;
  vertical-align: top;
}

.pilot-table-wrap th {
  background: var(--pilot-soft);
  color: var(--pilot-ink);
}

.pilot-table-wrap tr:last-child td {
  border-bottom: 0;
}

.pilot-checklist {
  display: grid;
  gap: 10px;
  padding: 0;
  list-style: none;
}

.pilot-checklist-item {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  margin: 0;
  padding: 12px 14px;
  border: 1px solid var(--pilot-line);
  border-radius: 8px;
  background: var(--pilot-white);
}

.pilot-checklist-item input {
  width: 18px;
  height: 18px;
  margin: 3px 0 0;
  accent-color: var(--pilot-brand);
}

.pilot-check legend {
  padding: 0 8px;
  color: var(--pilot-ink);
  font-weight: 800;
}

.pilot-option {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  margin-top: 12px;
  color: var(--pilot-text);
}

.pilot-option input {
  width: 18px;
  height: 18px;
  margin: 4px 0 0;
  accent-color: var(--pilot-brand);
}

.pilot-answer-feedback {
  margin: 16px 0 0;
  padding: 14px 16px;
  border-radius: 8px;
  background: var(--pilot-soft);
  color: var(--pilot-text);
}

.pilot-answer-feedback[data-state="correct"] {
  border-left: 4px solid var(--pilot-success);
}

.pilot-answer-feedback[data-state="incorrect"] {
  border-left: 4px solid var(--pilot-error);
}

.pilot-result {
  margin-top: 28px;
  padding: 24px;
  border: 2px solid var(--pilot-brand);
  border-radius: 8px;
  background: var(--pilot-soft);
}

.pilot-result:focus {
  outline: none;
}

.pilot-feedback-summary {
  max-height: 420px;
  margin: 20px 0 0;
  padding: 18px;
  overflow: auto;
  border: 1px solid var(--pilot-line);
  border-radius: 8px;
  background: var(--pilot-white);
  color: var(--pilot-ink);
  font: 0.9rem/1.55 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  white-space: pre-wrap;
}

.pilot-form-row {
  display: grid;
  gap: 8px;
  margin-top: 20px;
}

.pilot-form-row label {
  font-weight: 800;
}

.pilot-form-row input,
.pilot-form-row select,
.pilot-form-row textarea {
  width: 100%;
  min-height: 46px;
  padding: 10px 12px;
  border: 1px solid #aebdca;
  border-radius: 8px;
  background: var(--pilot-white);
  color: var(--pilot-ink);
  font: inherit;
}

.pilot-form-row textarea {
  min-height: 130px;
  resize: vertical;
}

.pilot-footer {
  border-top: 1px solid var(--pilot-line);
  background: var(--pilot-ink);
  color: var(--pilot-white);
}

.pilot-footer__inner {
  width: min(var(--pilot-width), calc(100% - 40px));
  margin: 0 auto;
  padding: 28px 0;
  font-size: 0.9rem;
}

.pilot-footer a {
  color: #b8edf8;
}

[hidden] {
  display: none !important;
}

@media (max-width: 860px) {
  .pilot-layout {
    grid-template-columns: 1fr;
  }

  .pilot-sidebar {
    position: static;
  }
}

@media (max-width: 620px) {
  .pilot-site-header__inner,
  .pilot-shell,
  .pilot-footer__inner {
    width: min(100% - 32px, 560px);
  }

  .pilot-site-header__inner {
    min-height: 68px;
  }

  .pilot-site-header__meta {
    max-width: 90px;
    text-align: right;
  }

  .pilot-shell {
    padding-top: 24px;
  }

  .pilot-main h1 {
    font-size: clamp(2.1rem, 11vw, 3rem);
  }

  .pilot-stat-grid,
  .pilot-card-grid {
    grid-template-columns: 1fr;
  }

  .pilot-actions,
  .pilot-page-nav,
  .pilot-progress-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .pilot-button {
    width: 100%;
  }

  .pilot-sequence li {
    grid-template-columns: 40px minmax(0, 1fr);
    padding: 18px;
  }

  .pilot-sequence li::before {
    width: 40px;
    height: 40px;
  }

  .pilot-instructional-figure {
    margin: 28px 0;
  }
}