.about-shell {
  background: #f7f9fc;
  min-height: calc(100vh - 82px);
  padding: 34px 0 56px;
}

.proto-container {
  max-width: 1340px;
  margin: 0 auto;
  padding: 0 28px;
}

.page-title-hero {
  margin: 0 0 64px;
  color: #183f72;
  font-size: 50px;
  font-weight: 760;
  line-height: 1.08;
}

.about-panel {
  background: transparent;
}

.about-layout {
  display: grid;
  grid-template-columns: 270px minmax(0, 1fr);
  gap: 34px;
  align-items: start;
}

.about-side {
  position: sticky;
  top: 104px;
  max-height: calc(100vh - 126px);
  overflow: auto;
  padding: 0 18px 22px 0;
  border-right: 1px solid #d9e2ee;
}

.about-search {
  display: grid;
  gap: 8px;
  margin-bottom: 20px;
}

.about-search span,
.about-side-title {
  color: #607286;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
}

.about-search input {
  width: 100%;
  min-height: 42px;
  border: 1px solid #cfdbea;
  border-radius: 8px;
  background: #ffffff;
  color: #173f78;
  font-size: 14px;
  padding: 0 12px;
  outline: none;
}

.about-search input:focus {
  border-color: #2f63b9;
  box-shadow: 0 0 0 3px rgba(47, 99, 185, 0.12);
}

.about-side-title {
  margin-bottom: 12px;
}

.about-nav {
  display: grid;
  gap: 2px;
}

.about-nav a {
  color: #19365f;
  text-decoration: none;
}

.about-nav-parent {
  display: block;
  padding: 8px 0 7px;
  font-size: 14px;
  font-weight: 800;
}

.about-nav-child {
  display: block;
  margin-left: 13px;
  padding: 5px 0 5px 12px;
  border-left: 2px solid #d8e1ef;
  color: #657489;
  font-size: 13px;
  font-weight: 600;
  line-height: 1.3;
}

.about-nav a.is-active,
.about-nav a:hover {
  color: #235aa6;
}

.about-nav-child.is-active {
  border-left-color: #0f766e;
  color: #0f766e;
}

.about-content {
  display: grid;
  gap: 34px;
  min-height: 720px;
}

.about-doc-section {
  scroll-margin-top: 112px;
  padding: 0 0 34px;
  border-bottom: 1px solid #d9e2ee;
}

.about-doc-header {
  display: grid;
  gap: 10px;
  padding-bottom: 10px;
}

.about-doc-header > span {
  color: #0f766e;
  font-size: 13px;
  font-weight: 850;
  letter-spacing: 0.06em;
}

.about-doc-header h3 {
  margin: 0 0 10px;
  color: #173f78;
  font-size: 28px;
  font-weight: 820;
  line-height: 1.2;
}

.about-doc-header p {
  max-width: 940px;
  margin: 0;
  color: #586b84;
  font-size: 16px;
  line-height: 1.85;
}

.about-detail-grid {
  display: grid;
  gap: 22px;
  padding-top: 12px;
}

.about-contact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px 56px;
  margin-top: 12px;
}

.about-contact-person {
  display: grid;
  align-content: start;
  gap: 7px;
  min-width: 0;
  margin: 0;
  color: #435a78;
  font-size: 16px;
  font-style: normal;
  line-height: 1.45;
}

.about-contact-person strong {
  color: #173f78;
  font-size: 17px;
  font-weight: 820;
}

.about-contact-person a {
  width: fit-content;
  max-width: 100%;
  color: #235aa6;
  overflow-wrap: anywhere;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.about-contact-person a:hover {
  color: #0f766e;
}

.about-doc-subsection {
  scroll-margin-top: 116px;
}

.about-detail-card {
  min-width: 0;
  padding: 0;
}

.about-detail-card h4 {
  margin: 0 0 12px;
  color: #214b8d;
  font-size: 18px;
  font-weight: 820;
  line-height: 1.3;
}

.about-detail-card p {
  margin: 0;
  color: #435a78;
  font-size: 16px;
  line-height: 1.8;
}

.about-detail-card p + p,
.about-detail-card p + ul {
  margin-top: 12px;
}

.about-detail-card ul {
  display: grid;
  gap: 10px;
  margin: 0;
  padding-left: 20px;
  color: #586b84;
  font-size: 15px;
  line-height: 1.75;
}

.about-detail-card li::marker {
  color: #0f766e;
}

.about-placeholder-media {
  margin: 14px 0 2px;
  overflow: hidden;
  border: 1px solid #d5deeb;
  border-radius: 8px;
  background: #ffffff;
  box-shadow: 0 8px 22px rgba(31, 62, 106, 0.06);
}

.about-media-image,
.about-media-video {
  display: block;
  width: 100%;
  height: auto;
  max-height: 620px;
  object-fit: contain;
  background: #f5f8fc;
}

.about-media-video {
  aspect-ratio: 16 / 9;
}

.about-architecture-embed {
  width: 100%;
  margin: 18px 0 2px;
  overflow: hidden;
  background: transparent;
}

.about-architecture-frame {
  display: block;
  width: 100%;
  aspect-ratio: 1600 / 920;
  border: 0;
  background: transparent;
}

.about-placeholder-stage {
  position: relative;
  display: grid;
  min-height: 220px;
  place-items: center;
  padding: 24px;
  background:
    linear-gradient(90deg, rgba(24, 63, 114, 0.06) 1px, transparent 1px),
    linear-gradient(180deg, rgba(24, 63, 114, 0.06) 1px, transparent 1px),
    linear-gradient(135deg, #ffffff 0%, #edf6f5 52%, #f4f7fb 100%);
  background-size: 28px 28px, 28px 28px, auto;
}

.about-placeholder-stage::before {
  content: "";
  position: absolute;
  inset: 24px;
  border: 1px dashed rgba(35, 90, 166, 0.34);
  border-radius: 8px;
}

.about-placeholder-type {
  position: absolute;
  left: 18px;
  top: 18px;
  min-width: 54px;
  padding: 5px 8px;
  border-radius: 6px;
  background: #173f78;
  color: #ffffff;
  font-size: 12px;
  font-weight: 800;
  text-align: center;
}

.about-placeholder-stage[data-media-type="GIF"] .about-placeholder-type {
  background: #0f766e;
}

.about-placeholder-file {
  z-index: 1;
  max-width: min(620px, 80%);
  color: #173f78;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.35;
  text-align: center;
  overflow-wrap: anywhere;
}

.about-placeholder-media figcaption {
  margin: 0;
  padding: 12px 16px;
  border-top: 1px solid #dce5f1;
  color: #657489;
  font-size: 13px;
  line-height: 1.6;
}

.about-placeholder-media figcaption strong {
  color: #173f78;
}

.about-no-results {
  max-width: 1340px;
  margin: 18px auto 0;
  padding: 0 28px;
  color: #9a4d1f;
  font-weight: 700;
}

@media (max-width: 1100px) {
  .about-layout {
    grid-template-columns: 1fr;
  }

  .about-side {
    position: static;
    max-height: none;
    border-right: 0;
    border-bottom: 1px solid #d9e2ee;
    padding: 0 0 20px;
  }

  .about-nav {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 4px 16px;
  }

  .about-nav-child {
    margin-left: 0;
  }
}

@media (max-width: 720px) {
  .proto-container {
    padding: 0 18px;
  }

  .page-title-hero {
    font-size: 40px;
  }

  .about-nav {
    grid-template-columns: 1fr;
  }

  .about-contact-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .about-placeholder-stage {
    min-height: 170px;
  }
}