body {
  background: #f7f8fb;
}

.subpage-header {
  position: relative;
  background-image: url("assets/images/home/header-banner.png");
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.subpage-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(8, 20, 35, 0.68);
}

.subpage-header-inner {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 28px;
  padding: 26px 0 22px;
}

.subpage-brand {
  text-decoration: none;
  display: inline-flex;
  flex-direction: column;
  gap: 6px;
}

.subpage-brand-title {
  font-family: "Noto Serif SC", "Times New Roman", serif;
  color: #ffffff;
  font-size: clamp(28px, 2.8vw, 38px);
  line-height: 1.2;
  font-weight: 700;
}

.subpage-brand-tag {
  color: rgba(225, 233, 245, 0.9);
  font-size: clamp(14px, 1.3vw, 18px);
}

.subpage-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
}

.subpage-language {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.subpage-language #languageSelect {
  border: 1px solid rgba(255, 255, 255, 0.45);
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.28);
  color: #ffffff;
  padding: 6px 10px;
  font: inherit;
}

.subpage-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 18px;
}

.subpage-nav a {
  text-decoration: none;
  color: rgba(245, 248, 255, 0.95);
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid transparent;
  transition: all 160ms ease;
}

.subpage-nav a:hover,
.subpage-nav a.active {
  border-color: rgba(255, 255, 255, 0.42);
  color: #ffffff;
  background: rgba(255, 255, 255, 0.14);
}

.research-main {
  background:
    radial-gradient(circle at 0% 0%, rgba(138, 75, 44, 0.08), rgba(138, 75, 44, 0) 35%),
    radial-gradient(circle at 100% 12%, rgba(31, 95, 155, 0.12), rgba(31, 95, 155, 0) 28%),
    #f7f8fb;
}

.research-shell {
  padding: 44px 0 64px;
}

#researchPageTitle {
  margin: 0;
  font-size: clamp(30px, 3.8vw, 46px);
  color: #1c2b3a;
}

.direction-image-section {
  margin-top: 22px;
}

.image-placeholder {
  border: 0;
  border-radius: 12px;
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: inherit;
  font-weight: inherit;
  padding: 0;
  overflow: hidden;
}

.image-placeholder img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  border-radius: inherit;
}

.image-placeholder-main {
  width: 100%;
  aspect-ratio: 16 / 9;
}

.direction-section {
  margin-top: 30px;
}

.direction-section h2,
.interest-section h2 {
  margin: 0;
  color: #213549;
  font-size: clamp(24px, 2.8vw, 34px);
}

.direction-item {
  margin-top: 18px;
  border: 1px solid #dce5ef;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 12px 28px rgba(22, 33, 52, 0.06);
  padding: 18px;
}

.direction-item h3 {
  margin: 0;
  font-size: clamp(20px, 2.1vw, 28px);
  color: #1f3650;
}

.direction-item p {
  margin: 12px 0 0;
  color: #3d4f62;
  line-height: 1.85;
  text-align: justify;
}

.interest-section {
  margin-top: 36px;
}

.interest-grid {
  margin-top: 16px;
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.interest-card {
  border: 1px solid #dce5ef;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 12px 28px rgba(22, 33, 52, 0.06);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.interest-card .image-placeholder {
  aspect-ratio: 4 / 3;
}

.interest-card h3 {
  margin: 0;
  color: #1f3650;
  font-size: clamp(19px, 1.9vw, 25px);
}

.interest-card p {
  margin: 0;
  color: #44586c;
  line-height: 1.8;
  text-align: justify;
}

@media (max-width: 980px) {
  .subpage-header-inner {
    flex-direction: column;
    align-items: stretch;
    gap: 16px;
  }

  .subpage-right {
    align-items: flex-start;
  }

  .subpage-nav {
    justify-content: flex-start;
  }

  .interest-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .research-shell {
    padding: 34px 0 48px;
  }

  .direction-item,
  .interest-card {
    padding: 14px;
  }
}