.hb-mertra-photo-guide {
  --hb-ink: #111111;
  --hb-copy: #333333;
  --hb-muted: #707070;
  --hb-line: #dddddd;
  --hb-soft: #f5f5f5;
  --hb-white: #ffffff;
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  color: var(--hb-copy);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 17px;
  line-height: 1.74;
  overflow-wrap: break-word;
}
.hb-mertra-photo-guide,
.hb-mertra-photo-guide * { box-sizing: border-box; }
.hb-mertra-photo-guide p,
.hb-mertra-photo-guide figure,
.hb-mertra-photo-guide h2,
.hb-mertra-photo-guide h3 { margin-top: 0; }
.hb-mertra-photo-guide p { margin-bottom: 20px; }
.hb-mertra-photo-guide h2 {
  margin: 66px 0 23px;
  padding-top: 19px;
  border-top: 2px solid var(--hb-ink);
  color: var(--hb-ink);
  font-size: clamp(27px, 3vw, 36px);
  line-height: 1.21;
  letter-spacing: -0.025em;
  scroll-margin-top: 28px;
}
.hb-mertra-photo-guide h3 {
  margin: 28px 0 12px;
  color: var(--hb-ink);
  font-size: 20px;
  line-height: 1.38;
}
.hb-mertra-photo-guide p a {
  color: var(--hb-ink);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: #8d8d8d;
  text-underline-offset: 4px;
}
.hb-mertra-photo-guide a:focus-visible,
.hb-mertra-photo-guide summary:focus-visible { outline: 2px solid var(--hb-ink); outline-offset: 3px; }
.hb-mertra-photo-guide .hb-mertra-lede {
  margin: 0 0 30px;
  color: #252525;
  font-size: 20px;
  line-height: 1.64;
}
/* Compact section navigation inspired by the existing site's neutral palette. */
.hb-mertra-photo-guide .hb-mertra-toc {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 8px;
  width: 100%;
  margin: 29px 0 40px;
  padding: 12px;
  border: 1px solid var(--hb-line);
  background: var(--hb-soft);
}
.hb-mertra-photo-guide .hb-mertra-toc a {
  min-width: 0;
  padding: 11px 7px;
  border: 1px solid #c7c7c7;
  background: var(--hb-white);
  color: var(--hb-ink);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.3;
  text-align: center;
  text-decoration: none;
  overflow-wrap: normal;
}
.hb-mertra-photo-guide .hb-mertra-toc a:hover,
.hb-mertra-photo-guide .hb-mertra-toc a:focus-visible {
  background: var(--hb-ink);
  color: var(--hb-white);
  border-color: var(--hb-ink);
}
/* A real-product visual reference, with the entire gallery clickable. */
.hb-mertra-photo-guide .hb-mertra-evidence {
  width: 100%;
  max-width: none;
  margin: 34px 0 40px;
}
.hb-mertra-photo-guide .hb-mertra-photo-link,
.hb-mertra-photo-guide .hb-mertra-label-link {
  display: block;
  overflow: hidden;
  border: 1px solid var(--hb-line);
  color: var(--hb-ink);
  background: #f2f2f2;
  text-decoration: none;
}
.hb-mertra-photo-guide .hb-mertra-photo-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--hb-line);
}
.hb-mertra-photo-guide .hb-mertra-photo-pair > .hb-mertra-photo-link {
  border: 0;
  min-width: 0;
}
.hb-mertra-photo-guide .hb-mertra-photo-pair img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  background: #f2f2f2;
}
.hb-mertra-photo-guide .hb-mertra-photo-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 20px;
  padding: 17px 20px;
  border-top: 1px solid var(--hb-line);
  background: var(--hb-white);
}
.hb-mertra-photo-guide .hb-mertra-photo-footer strong {
  font-size: 16px;
  line-height: 1.35;
}
.hb-mertra-photo-guide .hb-mertra-photo-footer a.hb-mertra-product-button {
  display: inline-block;
  padding: 9px 14px;
  border: 1px solid var(--hb-ink);
  background: var(--hb-ink);
  color: var(--hb-white);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.3;
  text-decoration: none;
  cursor: pointer;
}
.hb-mertra-photo-guide .hb-mertra-photo-footer a.hb-mertra-product-button:hover { background: var(--hb-white); color: var(--hb-ink); }
.hb-mertra-photo-guide figcaption {
  margin-top: 11px;
  color: var(--hb-muted);
  font-size: 14px;
  line-height: 1.6;
}
.hb-mertra-photo-guide .hb-mertra-label-evidence {
  width: 100%;
  max-width: none;
  margin: 30px 0 38px;
}
.hb-mertra-photo-guide .hb-mertra-label-link img {
  display: block;
  width: 100%;
  max-width: 620px;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  margin: 0 auto;
  background: #efefef;
}
.hb-mertra-photo-guide .hb-mertra-label-link span {
  display: block;
  padding: 13px 18px;
  border-top: 1px solid var(--hb-line);
  background: var(--hb-white);
  color: var(--hb-ink);
  font-size: 14px;
  font-weight: 700;
  text-align: center;
}
.hb-mertra-photo-guide .hb-mertra-label-link:hover span { background: var(--hb-ink); color: var(--hb-white); }
/* A single practical distinction, not a card for every paragraph. */
.hb-mertra-photo-guide .hb-mertra-evidence-note {
  margin: 26px 0 31px;
  padding: 21px 24px;
  border-left: 3px solid var(--hb-ink);
  background: var(--hb-soft);
  font-size: 16px;
  line-height: 1.65;
}
.hb-mertra-photo-guide .hb-mertra-evidence-note p { margin: 0; }
/* Static FAQ headings avoid rich-text editor native disclosure labels. */
.hb-mertra-photo-guide .hb-mertra-faq { margin-top: 4px; }
.hb-mertra-photo-guide .hb-mertra-faq .hb-mertra-item {
  margin-bottom: 12px;
  border: 1px solid var(--hb-line);
  background: var(--hb-white);
}
.hb-mertra-photo-guide .hb-mertra-faq .hb-mertra-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 20px;
}
.hb-mertra-photo-guide .hb-mertra-faq .hb-mertra-question h3 { margin: 0; font-size: 18px; line-height: 1.38; }
.hb-mertra-photo-guide .hb-mertra-faq .hb-mertra-answer { padding: 0 20px 20px; }
.hb-mertra-photo-guide .hb-mertra-faq .hb-mertra-answer p:last-child { margin-bottom: 0; }
.hb-mertra-photo-guide .hb-mertra-final {
  margin-top: 64px;
  padding: clamp(27px, 4vw, 46px);
  border: 2px solid var(--hb-ink);
  background: var(--hb-soft);
}
.hb-mertra-photo-guide .hb-mertra-final-title {
  margin: 0 0 17px;
  color: var(--hb-ink);
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 800;
  line-height: 1.26;
  letter-spacing: -0.02em;
}
.hb-mertra-photo-guide .hb-mertra-final p { max-width: none; }
.hb-mertra-photo-guide .hb-mertra-final-button {
  display: inline-block;
  max-width: 100%;
  margin-top: 6px;
  padding: 13px 19px;
  border: 1px solid var(--hb-ink);
  background: var(--hb-ink);
  color: var(--hb-white);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
  text-align: center;
  text-decoration: none;
}
.hb-mertra-photo-guide .hb-mertra-final-button:hover { background: var(--hb-white); color: var(--hb-ink); }
@media (max-width: 990px) {
  .hb-mertra-photo-guide .hb-mertra-toc { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 650px) {
  .hb-mertra-photo-guide { font-size: 16px; line-height: 1.7; }
  .hb-mertra-photo-guide h2 { margin-top: 52px; font-size: clamp(26px, 7vw, 32px); }
  .hb-mertra-photo-guide .hb-mertra-lede { font-size: 18px; }
  .hb-mertra-photo-guide .hb-mertra-toc { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hb-mertra-photo-guide .hb-mertra-photo-footer { padding: 15px; }
  .hb-mertra-photo-guide .hb-mertra-photo-footer strong { font-size: 15px; }
  .hb-mertra-photo-guide .hb-mertra-faq .hb-mertra-question { padding: 17px 16px; }
  .hb-mertra-photo-guide .hb-mertra-faq .hb-mertra-answer { padding: 0 16px 18px; }
}
@media (max-width: 390px) {
  .hb-mertra-photo-guide .hb-mertra-toc { grid-template-columns: 1fr; }
  .hb-mertra-photo-guide .hb-mertra-toc a { text-align: left; }
}
/* Keep every major section aligned with the article's text edges. */
.hb-mertra-photo-guide .hb-mertra-toc,
.hb-mertra-photo-guide .hb-mertra-evidence,
.hb-mertra-photo-guide .hb-mertra-label-evidence,
.hb-mertra-photo-guide .hb-mertra-evidence-note,
.hb-mertra-photo-guide .hb-mertra-faq,
.hb-mertra-photo-guide .hb-mertra-final {
  width: 100%;
  max-width: none;
  margin-left: 0;
  margin-right: 0;
}