.planning-guide-header .article-shell { width: min(var(--max), calc(100% - 44px)); }
.planning-guide-header h1 {
  max-width: 1180px;
  font-size: clamp(42px, 4.2vw, 52px);
  line-height: 1.02;
}
.planning-guide-header .article-deck { max-width: 820px; }

.article-back-link {
  width: fit-content;
  margin: 0 0 30px;
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--copper-dark);
  font-family: Montserrat, Inter, sans-serif;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .01em;
  text-decoration: none;
}

.article-back-link__arrow {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(112, 65, 46, .24);
  border-radius: 50%;
  background: rgba(255, 255, 255, .72);
  font-size: 18px;
  line-height: 1;
  transition: transform .2s ease, background-color .2s ease;
}

.article-back-link:hover .article-back-link__arrow,
.article-back-link:focus-visible .article-back-link__arrow {
  background: rgba(158, 92, 63, .10);
  transform: translateX(-3px);
}

.article-back-link:focus-visible {
  border-radius: 999px;
  outline: 2px solid var(--copper-dark);
  outline-offset: 4px;
}

.planning-hero {
  height: auto;
  background: #f0ece7;
}

.planning-hero img {
  width: 100%;
  height: auto;
  aspect-ratio: 1600 / 794;
  object-fit: cover;
}

.planning-hero figcaption,
.surface-gallery figcaption,
.planning-figure figcaption {
  padding: 13px 16px 15px;
  color: var(--muted);
  background: #fff;
  font-size: 12px;
  line-height: 1.5;
}

.planning-overview {
  width: min(1080px, calc(100% - 44px));
  margin: clamp(34px, 5vw, 58px) auto 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(22px, 4vw, 54px);
}

.planning-overview div {
  padding-top: 16px;
  border-top: 2px solid rgba(158, 92, 63, .54);
}

.planning-overview dt {
  color: var(--copper-dark);
  font-family: Montserrat, Inter, sans-serif;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.planning-overview dd {
  margin: 10px 0 0;
  color: #3b3f42;
  font-size: 14px;
  line-height: 1.65;
}

.planning-layout { width: min(1080px, calc(100% - 44px)); }

.planning-principles {
  margin: 50px 0 58px;
  padding: clamp(28px, 4vw, 42px);
  border-radius: var(--soft-radius);
  color: #fff;
  background: #293638;
}

.planning-principles h2 {
  margin: 0 0 26px;
  color: #fff;
  font-size: clamp(28px, 3vw, 38px);
}

.planning-principles__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 30px;
}

.planning-principles__grid div {
  padding-top: 15px;
  border-top: 1px solid rgba(255, 255, 255, .24);
}

.planning-principles__grid strong,
.planning-principles__grid span { display: block; }
.planning-principles__grid strong {
  font-family: Montserrat, Inter, sans-serif;
  font-size: 16px;
}
.planning-principles__grid span {
  margin-top: 8px;
  color: rgba(255, 255, 255, .72);
  font-size: 13px;
  line-height: 1.55;
}

.survey-questions {
  margin: 32px 0 56px;
  padding: clamp(26px, 4vw, 38px);
  border: 1px solid var(--line);
  border-radius: var(--soft-radius);
  background: #fff;
}

.survey-questions h3 { margin: 0 0 18px; }
.survey-questions > div {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 28px;
}
.survey-questions p {
  margin: 0;
  padding: 15px 0;
  border-top: 1px solid var(--line);
}
.survey-questions strong,
.survey-questions span { display: block; }
.survey-questions strong {
  color: var(--ink);
  font-family: Montserrat, Inter, sans-serif;
  font-size: 14px;
  line-height: 1.4;
}
.survey-questions span {
  margin-top: 7px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

.surface-gallery {
  margin: 32px 0 40px;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(230px, .75fr);
  grid-template-rows: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.surface-gallery figure,
.planning-figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
}

.surface-gallery__wall { grid-row: 1 / -1; }
.surface-gallery img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}
.surface-gallery__wall img { height: calc(100% - 62px); min-height: 520px; }

.surface-decisions {
  margin: 0 0 58px;
  border-top: 1px solid var(--line);
}
.surface-decisions section {
  padding: 24px 0;
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 28px;
  border-bottom: 1px solid var(--line);
}
.surface-decisions h3,
.surface-decisions p { margin: 0; }
.surface-decisions h3 { font-size: 18px; }
.surface-decisions p { color: var(--muted); }

.clarity-note {
  margin: 28px 0 30px;
  padding: 22px 24px;
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr);
  gap: 24px;
  border-left: 4px solid var(--cyan);
  border-radius: 0 16px 16px 0;
  background: #eef3f1;
}
.clarity-note strong {
  color: #244849;
  font-family: Montserrat, Inter, sans-serif;
  font-size: 15px;
  line-height: 1.4;
}
.clarity-note p { margin: 0; color: #455253; font-size: 14px; line-height: 1.6; }

.planning-figure { margin: 30px 0 46px; }
.planning-figure img {
  width: 100%;
  max-height: 680px;
  object-fit: cover;
}
.planning-figure--landscape { width: min(720px, 100%); margin-left: auto; margin-right: auto; }
.planning-figure--landscape img { aspect-ratio: 4 / 3; object-position: center 35%; }

.response-comparison {
  margin: 32px 0 24px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.response-comparison section {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
}
.response-comparison__media {
  position: relative;
  height: clamp(220px, 22vw, 270px);
  overflow: hidden;
  background: #f2f1ee;
}
.response-comparison .response-comparison__media img {
  position: absolute;
  inset: 16px;
  box-sizing: border-box;
  width: calc(100% - 32px);
  height: calc(100% - 32px);
  object-fit: contain;
}
.response-comparison__content { padding: 22px; }
.response-comparison h3 { margin: 0 0 10px; }
.response-comparison p { margin: 0 0 18px; color: var(--muted); font-size: 14px; line-height: 1.65; }
.response-comparison strong,
.response-comparison span { display: block; }
.response-comparison strong {
  color: var(--copper-dark);
  font-family: Montserrat, Inter, sans-serif;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.response-comparison span { margin-top: 6px; color: #3b3f42; font-size: 13px; line-height: 1.55; }

.installation-pair {
  margin: 30px 0 54px;
  display: grid;
  grid-template-columns: minmax(260px, .8fr) minmax(0, 1.2fr);
  gap: 28px;
  align-items: stretch;
}
.installation-pair .planning-figure { margin: 0; }
.installation-pair .planning-figure img { height: 100%; min-height: 470px; }
.installation-notes {
  padding: clamp(26px, 4vw, 38px);
  border-radius: 18px;
  background: #f1ebe5;
}
.installation-notes h3 { margin-top: 0; }
.installation-notes ul { margin-bottom: 0; padding-left: 20px; }

.commission-flow {
  margin: 30px 0 58px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 28px;
  border-top: 1px solid var(--line);
}
.commission-flow div {
  padding: 22px 0;
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 18px;
  border-bottom: 1px solid var(--line);
}
.commission-flow strong {
  color: var(--copper-dark);
  font-family: Montserrat, Inter, sans-serif;
  font-size: 14px;
}
.commission-flow span { color: var(--muted); font-size: 14px; line-height: 1.6; }

.field-example {
  margin: 30px 0 58px;
  overflow: hidden;
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(0, .9fr);
  border: 1px solid var(--line);
  border-radius: var(--soft-radius);
  background: #fff;
}
.field-example img { width: 100%; height: 100%; min-height: 350px; object-fit: cover; }
.field-example > div { padding: clamp(28px, 4vw, 42px); align-self: center; }
.field-example h3 { margin-top: 0; font-size: clamp(24px, 3vw, 34px); line-height: 1.1; }
.field-example p { color: var(--muted); font-size: 15px; line-height: 1.7; }
.field-example a {
  width: fit-content;
  display: inline-flex;
  margin-top: 4px;
  font-family: Montserrat, Inter, sans-serif;
  font-size: 13px;
  font-weight: 800;
}

.planning-checklist {
  margin: 30px 0 58px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}
.planning-checklist section {
  padding: clamp(24px, 3vw, 32px);
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
}
.planning-checklist section:last-child { background: #eef3f1; }
.planning-checklist h3 { margin-top: 0; }
.planning-checklist ul { margin-bottom: 0; padding-left: 20px; }

.planning-faq {
  margin: 28px 0 58px;
  border-top: 1px solid var(--line);
}
.planning-faq details { border-bottom: 1px solid var(--line); }
.planning-faq summary {
  position: relative;
  padding: 20px 42px 20px 0;
  color: var(--ink);
  font-family: Montserrat, Inter, sans-serif;
  font-size: 16px;
  font-weight: 750;
  line-height: 1.45;
  cursor: pointer;
  list-style: none;
}
.planning-faq summary::-webkit-details-marker { display: none; }
.planning-faq summary::after {
  position: absolute;
  right: 4px;
  top: 17px;
  color: var(--copper-dark);
  font-size: 22px;
  content: "+";
}
.planning-faq details[open] summary::after { content: "-"; }
.planning-faq details p { max-width: 660px; margin: -4px 0 20px; color: var(--muted); }

.related-reading {
  margin-top: 58px;
  padding: clamp(26px, 4vw, 38px);
  border-radius: var(--soft-radius);
  background: #f4f1ed;
}
.related-reading h2 { margin: 0 0 18px; }
.article-body .related-reading > a {
  padding: 18px 0;
  display: grid;
  grid-template-columns: minmax(190px, .75fr) minmax(0, 1.25fr);
  gap: 26px;
  border-top: 1px solid var(--line);
  color: inherit;
  text-decoration: none;
}
.related-reading strong { color: var(--ink); font-family: Montserrat, Inter, sans-serif; font-size: 14px; }
.related-reading span { color: var(--muted); font-size: 13px; line-height: 1.55; }
.article-body .related-reading > a:hover strong,
.article-body .related-reading > a:focus-visible strong { color: var(--copper-dark); }

.article-cta__actions { display: flex; flex-wrap: wrap; gap: 10px; }
.article-cta__actions a + a {
  color: #fff;
  background: transparent;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .72);
}
.article-cta a:active,
.field-example a:active,
.related-reading a:active { transform: translateY(1px); }

@media (max-width: 900px) {
  .planning-overview { grid-template-columns: 1fr; gap: 18px; }
  .planning-overview div { padding-top: 12px; }
  .surface-gallery { grid-template-columns: 1fr; grid-template-rows: auto; }
  .surface-gallery__wall { grid-row: auto; }
  .surface-gallery img,
  .surface-gallery__wall img { height: auto; min-height: 0; aspect-ratio: 4 / 3; }
  .surface-gallery figure:last-child img { aspect-ratio: 4 / 5; }
  .field-example { grid-template-columns: 1fr; }
  .field-example img { min-height: 0; aspect-ratio: 4 / 3; }
}

@media (max-width: 760px) {
  .planning-guide-header h1 { font-size: clamp(36px, 10vw, 48px); }
  .planning-principles__grid,
  .survey-questions > div,
  .response-comparison,
  .installation-pair,
  .commission-flow,
  .planning-checklist { grid-template-columns: 1fr; }
  .surface-decisions section,
  .clarity-note,
  .commission-flow div,
  .article-body .related-reading > a { grid-template-columns: 1fr; gap: 8px; }
  .installation-pair .planning-figure img { min-height: 0; }
  .response-comparison__media { height: min(68vw, 280px); }
  .article-cta__actions { display: grid; }
  .article-cta__actions a { width: 100%; justify-content: center; text-align: center; }
}

@media (max-width: 560px) {
  .planning-guide-header .article-shell,
  .planning-hero,
  .planning-overview,
  .planning-layout { width: calc(100% - 32px); }
  .planning-guide-header .section-label { font-size: 10px; }
  .planning-hero figcaption { padding: 12px 14px 14px; }
  .planning-principles,
  .survey-questions,
  .related-reading { padding: 24px 20px; }
  .response-comparison section > div,
  .installation-notes,
  .planning-checklist section { padding: 22px 20px; }
  .field-example > div { padding: 26px 22px 30px; }
}

@media (prefers-reduced-motion: reduce) {
  .article-back-link__arrow,
  .article-cta a,
  .field-example a,
  .related-reading a { transition: none; }
}