:root {
  --culture-bg: #faf9f4;
  --culture-surface: #ffffff;
  --culture-soft: #f5f3ee;
  --culture-line: rgba(113, 121, 116, 0.14);
  --culture-ink: #1b1c19;
  --culture-muted: #414944;
  --culture-green: #1b3d2f;
  --culture-green-soft: rgba(27, 61, 47, 0.08);
}

body {
  background: #fbf9f4;
}

.culture-page-shell {
  min-height: 100vh;
  max-width: 1540px;
  margin: 0 auto;
}

.culture-shell {
  display: grid;
  grid-template-columns: 236px minmax(0, 1fr);
  min-height: 100vh;
}

.culture-sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  background: #f5f3ee;
  border-right: 1px solid var(--culture-line);
  padding: 10px 24px 24px;
  display: flex;
  flex-direction: column;
  box-sizing: border-box;
  overflow-y: auto;
}

.culture-brand {
  display: block;
  width: 100%;
  margin: 0 0 18px;
  line-height: 0;
  text-decoration: none;
  overflow: hidden;
}

.culture-brand .site-logo {
  display: block;
  width: 100%;
  max-width: 176px;
  height: auto;
  margin: 0 auto;
  object-fit: contain;
}

.culture-nav,
.culture-subnav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.culture-nav {
  margin-top: 34px;
}

.culture-subnav {
  margin-top: 26px;
}

.culture-nav a,
.culture-subnav a {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-left: -24px;
  padding: 14px 16px 14px 24px;
  border-radius: 0 14px 14px 0;
  color: #666761;
  text-decoration: none;
  font-size: 1.06rem;
  font-weight: 780;
  transition: background-color .18s ease, color .18s ease;
}

.culture-nav a:hover,
.culture-subnav a:hover {
  background: rgba(255, 255, 255, 0.38);
  color: var(--culture-green);
}

.culture-nav a.is-active,
.culture-subnav a.is-active {
  background: rgba(255, 255, 255, 0.58);
  border-left: 4px solid var(--culture-green);
  color: var(--culture-green);
  padding-left: 20px;
  font-weight: 800;
}

.culture-subnav-label {
  margin-top: 28px;
  margin-bottom: 10px;
  color: #8a7f70;
  font-size: 0.84rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.culture-main {
  padding: 40px 48px 56px;
}

.culture-sidebar-start {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 14px 18px;
  border-radius: 999px;
  background: linear-gradient(135deg, #03271a 0%, #1b3d2f 100%);
  color: #fff;
  text-decoration: none;
  font-size: 1.24rem;
  font-weight: 800;
  box-sizing: border-box;
}

.culture-hero,
.culture-article {
  background: #fff;
  border-radius: 28px;
  box-shadow: 0 24px 50px rgba(27, 28, 25, 0.05);
}

.culture-hero {
  margin-bottom: 24px;
  min-height: 336px;
  padding: 50px 52px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.culture-hero h1 {
  margin: 0 0 12px;
  font-family: "Newsreader", serif;
  font-size: clamp(2.8rem, 5vw, 4.5rem);
  line-height: 1.02;
  color: #002318;
  letter-spacing: -0.05em;
}

.culture-hero p {
  margin: 0;
  max-width: 880px;
  color: var(--culture-muted);
  line-height: 1.9;
  font-size: 1.08rem;
}

.culture-article {
  padding: 32px;
}

.culture-article > p:first-child {
  margin-top: 0;
}

.culture-back {
  margin-top: 28px;
}

@media (max-width: 900px) {
  .culture-shell {
    grid-template-columns: 1fr;
  }

  .culture-sidebar {
    display: none;
  }

  .culture-main {
    padding: 24px 18px 42px;
  }

  .culture-hero,
  .culture-article {
    border-radius: 22px;
  }

  .culture-hero {
    min-height: 280px;
    padding: 32px 24px;
  }

  .culture-hero h1 {
    font-size: clamp(2.2rem, 8vw, 3rem);
  }

  .culture-hero p {
    font-size: 1rem;
  }

  .culture-article {
    padding: 24px;
  }
}