/* Technical design page. Shared navigation and type styles live in assets/site.css. */
.dr-page {
  --dr-accent: #17685f;
  --dr-wash: #eef5f3;
}

/* A top contents strip leaves the full page width available for architecture diagrams. */
.dr-page .case-grid {
  display: block;
}
.dr-page .case-nav {
  position: static;
  margin-bottom: 45px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
}
.dr-page .case-nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
}
.dr-page .case-nav-links a {
  padding: 10px 0;
  margin-left: 0;
  border-left: 0;
  border-bottom: 2px solid transparent;
}
.dr-page .case-nav-links a[aria-current='true'] {
  border-bottom-color: var(--dr-accent);
}
.dr-page .case-content {
  max-width: none;
}
.dr-page .case-section > .body-copy,
.dr-page .case-section > .lead,
.dr-definitions dd,
.dr-responsibilities dd,
.dr-checklist,
.dr-steps {
  max-width: 920px;
}

/* Introduction: the design approach and recovery priorities. */
.dr-hero {
  padding-top: 48px;
  padding-bottom: 50px;
}
.dr-hero h1 {
  max-width: 1000px;
  margin-top: 18px;
  font-size: clamp(2.6rem, 4.4vw, 4rem);
  line-height: 1.1;
}
.dr-intro {
  max-width: 850px;
  margin-top: 26px;
  font-size: 23px;
  line-height: 1.55;
}
.dr-summary {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
  margin-top: 34px;
  padding-block: 22px;
  border-block: 1px solid var(--line);
}
.dr-summary span {
  display: block;
  margin-bottom: 8px;
  font: 11px/1.5 var(--mono);
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.dr-summary strong {
  font-size: 16px;
  font-weight: 500;
}
.dr-page .section-kicker,
.dr-page .case-nav a[aria-current='true'] {
  color: var(--dr-accent);
}
.dr-page .case-nav a[aria-current='true'] {
  border-color: var(--dr-accent);
}
.dr-page .case-section > h2 {
  max-width: 900px;
  font-size: clamp(1.8rem, 3vw, 2.4rem);
}
.dr-page .body-copy + .body-copy {
  margin-top: 20px;
}
.dr-subheading {
  margin-block: 30px 16px;
  font-size: 23px;
  line-height: 1.4;
}

/* Short comparisons and explicit responsibilities keep long prose scannable. */
.dr-definitions,
.dr-responsibilities {
  margin-block: 28px;
  border-top: 1px solid var(--line);
}
.dr-definitions > div,
.dr-responsibilities > div {
  padding-block: 20px;
  border-bottom: 1px solid var(--line);
}
.dr-definitions dt,
.dr-responsibilities dt {
  color: var(--dr-accent);
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 10px;
}
.dr-definitions dd,
.dr-responsibilities dd {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
}
.dr-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
  margin-block: 28px;
}
.dr-pair article {
  padding-top: 20px;
  border-top: 2px solid #c6d8d2;
}
.dr-pair h3 {
  font-size: 22px;
  line-height: 1.3;
  margin-bottom: 16px;
}
.dr-pair article > p:not(.eyebrow) {
  color: var(--muted);
  font-size: 16px;
}
.dr-pair p + p {
  margin-top: 16px;
}
.dr-pair .eyebrow {
  margin-bottom: 14px;
}
.dr-strategies article {
  padding: 24px;
  border: 1px solid var(--line);
}
.dr-strategies .dr-selected {
  background: var(--dr-wash);
  border-top: 3px solid var(--dr-accent);
}
.dr-note {
  margin-block: 28px;
  padding: 20px 24px;
  border-left: 3px solid var(--dr-accent);
  background: var(--dr-wash);
  color: #3d5655;
  font-size: 16px;
}
.dr-note strong {
  color: var(--ink);
}
.dr-page code {
  font: 0.9em/1.5 var(--mono);
}
.dr-checklist {
  padding-left: 22px;
  margin-bottom: 24px;
  color: var(--muted);
}
.dr-checklist li + li {
  margin-top: 16px;
}
.dr-checklist strong {
  color: var(--ink);
}

/* Native SVG with a separate mobile composition; no diagram runtime is required. */
.dr-architecture {
  max-width: 1040px;
  margin: 28px auto;
}
.dr-architecture picture {
  display: block;
  border: 1px solid var(--line);
  background: #fff;
}
.dr-architecture img {
  display: block;
  width: 100%;
  height: auto;
}
.dr-architecture figcaption {
  margin-top: 16px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
}
.dr-architecture figcaption a {
  color: var(--dr-accent);
  text-underline-offset: 3px;
}

/* The five-step overview is an ordered HTML flow, readable without JavaScript. */
.dr-sequence {
  margin-block: 28px;
}
.dr-sequence figcaption {
  margin-bottom: 16px;
  font: 12px/1.6 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--muted);
}
.dr-sequence ol {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 22px;
  padding: 0;
  list-style: none;
}
.dr-sequence li {
  position: relative;
  padding: 14px 12px;
  border-top: 3px solid var(--dr-accent);
  background: var(--dr-wash);
}
.dr-sequence li:not(:last-child)::after {
  content: '→';
  position: absolute;
  right: -19px;
  top: 50%;
  color: var(--dr-accent);
}
.dr-sequence span {
  display: block;
  margin-bottom: 10px;
  color: var(--dr-accent);
  font: 12px/1.5 var(--mono);
}
.dr-sequence strong {
  display: block;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
}
.dr-steps {
  padding-left: 26px;
  margin-top: 35px;
}
.dr-steps > li {
  padding-left: 8px;
  margin-bottom: 30px;
}
.dr-steps > li::marker {
  color: var(--dr-accent);
  font-weight: 600;
}
.dr-steps h3 {
  margin-bottom: 12px;
  font-size: 22px;
  line-height: 1.4;
}
.dr-steps p {
  color: var(--muted);
}
.dr-steps p + p {
  margin-top: 14px;
}
.dr-references {
  padding-left: 0;
  margin-top: 24px;
  list-style: none;
}
.dr-references li {
  padding-block: 16px;
  border-bottom: 1px solid var(--line);
}
.dr-references a {
  color: var(--dr-accent);
  text-underline-offset: 4px;
}
.dr-references p {
  margin-top: 8px;
  color: var(--muted);
  font-size: 14px;
}
.dr-return {
  margin-top: 30px;
}

@media (max-width: 1000px) {
  .dr-pair {
    grid-template-columns: minmax(0, 1fr);
  }
}
@media (max-width: 760px) {
  .dr-architecture picture {
    max-width: 480px;
    margin-inline: auto;
  }
  .dr-page .case-nav {
    position: sticky;
    margin-bottom: 30px;
    padding-bottom: 0;
  }
  .dr-page .case-nav-links {
    display: block;
  }
  .dr-page .case-nav-links a {
    padding: 10px;
    border-bottom: 0;
  }
  .dr-hero h1 {
    font-size: clamp(2.2rem, 7vw, 3rem);
  }
  .dr-intro {
    font-size: 20px;
  }
  .dr-summary {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
  }
  .dr-page .case-nav-current {
    color: var(--dr-accent);
  }
  .dr-page .case-nav a[aria-current='true'] {
    background: var(--dr-wash);
  }
}
@media (max-width: 600px) {
  .dr-sequence ol {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }
  .dr-sequence li {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    border-top: 0;
    border-left: 3px solid var(--dr-accent);
  }
  .dr-sequence span {
    margin: 0;
  }
  .dr-sequence li:not(:last-child)::after {
    content: '↓';
    left: 50%;
    top: auto;
    bottom: -24px;
  }
  .dr-note,
  .dr-strategies article {
    padding: 20px;
  }
}
@media print {
  .dr-architecture,
  .dr-sequence,
  .dr-pair article {
    break-inside: avoid;
  }
}