.project-install {
  width: 100%;
  margin-top: 32px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.project-install-heading {
  display: grid;
  grid-template-columns: minmax(128px, .36fr) minmax(0, 1fr);
  gap: 28px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.project-install-index,
.project-install-platform {
  color: var(--muted);
  font: 700 9px/1.25 var(--font-mono);
  letter-spacing: .13em;
  text-transform: uppercase;
}

.project-install-heading h2,
.project-install-option h3,
.project-install-utility h3,
.project-install-controls h3 {
  margin: 0;
  color: var(--ink);
  letter-spacing: -.035em;
}

.project-install-heading h2 {
  font-size: clamp(28px, 3.4vw, 36px);
  line-height: 1.1;
}

.project-install-heading p,
.project-install-option p,
.project-install-utility p,
.project-install-note {
  color: var(--muted);
  line-height: 1.7;
}

.project-install-heading p {
  max-width: 60ch;
  margin: 12px 0 0;
}

.project-install-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.project-install-option {
  min-width: 0;
  padding: 28px;
}

.project-install-option:first-child {
  padding-left: 0;
  border-right: 1px solid var(--line);
}

.project-install-option:last-child { padding-right: 0; }

.project-install-option h3,
.project-install-utility h3,
.project-install-controls h3 {
  margin-top: 12px;
  font-size: 22px;
  line-height: 1.2;
}

.project-install-option p { min-height: 82px; margin: 12px 0 22px; }

.project-install-actions,
.project-install-client-grid,
.project-install-control-links {
  display: grid;
  gap: 8px;
}

.project-install-action,
.project-install-client,
.project-install-control-links a {
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 0 14px;
  border: 1px solid var(--line);
  color: var(--ink);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.35;
  text-decoration: none;
  transition: border-color 160ms ease, background-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.project-install-action:hover,
.project-install-client:hover,
.project-install-control-links a:hover {
  border-color: color-mix(in srgb, var(--math) 58%, var(--line));
  background: color-mix(in srgb, var(--math) 5%, transparent);
}

.project-install-action:active,
.project-install-client:active,
.project-install-control-links a:active { transform: translateY(1px); }

.project-install-action.is-primary {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--paper-solid);
}

.project-install-action.is-primary:hover {
  border-color: var(--math);
  background: var(--math);
  color: #fff;
}

.project-install-client-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.project-install-client:last-child { grid-column: 1 / -1; }

.project-install-text-link {
  display: inline-block;
  margin-top: 18px;
  color: var(--ink);
  font-size: 12px;
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--math);
  text-underline-offset: 4px;
}

.project-install-utility,
.project-install-controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(190px, .42fr);
  gap: 28px;
  align-items: end;
  padding: 28px 0;
  border-top: 1px solid var(--line);
}

.project-install-utility p { max-width: 58ch; margin: 12px 0 0; }

.project-install-controls { align-items: start; }
.project-install-control-links { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.project-install-note { grid-column: 1 / -1; margin: -8px 0 0; font-size: 13px; }

.project-guide {
  width: 100%;
  margin-top: 72px;
  border-top: 1px solid var(--line);
}

.project-guide-heading {
  display: grid;
  grid-template-columns: minmax(128px, .36fr) minmax(0, 1fr);
  gap: 28px;
  padding: 32px 0;
  border-bottom: 1px solid var(--line);
}

.project-guide-heading h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(28px, 3.4vw, 36px);
  line-height: 1.1;
  letter-spacing: -.035em;
}

.project-guide-heading p {
  max-width: 66ch;
  margin: 14px 0 0;
  color: var(--muted);
  line-height: 1.75;
}

.project-guide-heading-actions {
  display: grid;
  max-width: 300px;
  margin-top: 20px;
}

.project-guide-toc {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-bottom: 1px solid var(--line);
}

.project-guide-toc a {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 12px;
  min-height: 48px;
  align-items: center;
  padding: 0 16px;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  font-size: 12px;
  font-weight: 700;
  text-decoration: none;
  transition: background-color 160ms ease, color 160ms ease;
}

.project-guide-toc a:nth-child(odd) { border-right: 1px solid var(--line); }
.project-guide-toc a:nth-last-child(-n + 2) { border-bottom: 0; }
.project-guide-toc a:hover { background: color-mix(in srgb, var(--math) 5%, transparent); }
.project-guide-toc a > span:first-child { color: var(--math); font: 700 9px/1 var(--font-mono); letter-spacing: .1em; }

.project-guide-step {
  display: grid;
  grid-template-columns: minmax(72px, .19fr) minmax(0, 1fr);
  gap: 28px;
  padding: 48px 0;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 84px;
}

.project-guide-number {
  color: var(--math);
  font: 700 11px/1 var(--font-mono);
  letter-spacing: .12em;
}

.project-guide-copy { min-width: 0; }

.project-guide-copy h3,
.project-guide-copy h4 {
  margin: 0;
  color: var(--ink);
  letter-spacing: -.025em;
}

.project-guide-copy h3 { font-size: clamp(24px, 3vw, 32px); line-height: 1.15; }
.project-guide-copy h4 { font-size: 16px; line-height: 1.35; }

.project-guide-copy > p,
.project-guide-copy li,
.project-guide-faq p {
  color: var(--muted);
  line-height: 1.75;
}

.project-guide-copy > p { max-width: 68ch; margin: 18px 0 0; }
.project-guide-copy ul,
.project-guide-copy ol { margin: 20px 0 0; padding-left: 1.4em; }
.project-guide-copy li + li { margin-top: 8px; }
.project-guide-copy code {
  overflow-wrap: anywhere;
  color: var(--ink);
  font: 600 .9em/1.5 var(--font-mono);
}

.project-guide-columns,
.project-guide-faq {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin-top: 28px;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.project-guide-columns > div,
.project-guide-faq > div {
  min-width: 0;
  padding: 22px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.project-guide-columns ol,
.project-guide-faq ul { margin-top: 14px; }
.project-guide-faq p { margin: 14px 0 0; }

.project-guide-callout {
  display: grid;
  grid-template-columns: minmax(110px, .28fr) minmax(0, 1fr);
  gap: 18px;
  margin-top: 24px;
  padding: 18px;
  border-left: 2px solid var(--math);
  background: color-mix(in srgb, var(--math) 5%, transparent);
  color: var(--muted);
  line-height: 1.7;
}

.project-guide-callout strong {
  color: var(--ink);
  font: 700 10px/1.5 var(--font-mono);
  letter-spacing: .08em;
  text-transform: uppercase;
}

.project-guide-callout.is-warning {
  border-left-color: var(--cs);
  background: color-mix(in srgb, var(--cs) 5%, transparent);
}

.project-guide-callout.is-ok {
  border-left-color: var(--stats);
  background: color-mix(in srgb, var(--stats) 5%, transparent);
}

.project-guide-code-list {
  margin-top: 22px;
  border-top: 1px solid var(--line);
}

.project-guide-code-list > div {
  display: grid;
  grid-template-columns: minmax(110px, .28fr) minmax(0, 1fr);
  gap: 18px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.project-guide-code-list span { color: var(--muted); font-size: 12px; font-weight: 700; }

.project-guide-references {
  display: grid;
  grid-template-columns: minmax(128px, .36fr) minmax(0, 1fr);
  gap: 28px;
  padding: 32px 0;
  border-bottom: 1px solid var(--line);
}

.project-guide-references > div {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 24px;
}

.project-guide-references a {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  font-size: 12px;
  font-weight: 700;
  text-decoration: none;
}

.project-guide-references a:hover { color: var(--math); }

@media (max-width: 700px) {
  .project-install-heading,
  .project-install-utility,
  .project-install-controls { grid-template-columns: 1fr; gap: 18px; }

  .project-install-grid { grid-template-columns: 1fr; }

  .project-install-option,
  .project-install-option:first-child,
  .project-install-option:last-child { padding: 24px 0; }

  .project-install-option:first-child {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .project-install-option p { min-height: 0; }
  .project-install-client-grid,
  .project-install-control-links { grid-template-columns: 1fr; }
  .project-install-client:last-child { grid-column: auto; }
  .project-install-utility { align-items: start; }

  .project-guide { margin-top: 52px; }
  .project-guide-heading,
  .project-guide-step,
  .project-guide-references { grid-template-columns: 1fr; gap: 18px; }
  .project-guide-heading { padding: 28px 0; }
  .project-guide-toc { grid-template-columns: 1fr; }
  .project-guide-toc a,
  .project-guide-toc a:nth-child(odd),
  .project-guide-toc a:nth-last-child(2) { border-right: 0; border-bottom: 1px solid var(--line); }
  .project-guide-toc a:last-child { border-bottom: 0; }
  .project-guide-step { padding: 36px 0; }
  .project-guide-columns,
  .project-guide-faq { grid-template-columns: 1fr; }
  .project-guide-callout,
  .project-guide-code-list > div { grid-template-columns: 1fr; gap: 8px; }
  .project-guide-references > div { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  .project-install-action,
  .project-install-client,
  .project-install-control-links a,
  .project-guide-toc a { transition: none; }
}