:root {
  --bg: #ffffff;
  --text: #151515;
  --muted: #666666;
  --line: #ececec;
  --card: #ffffff;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
  --radius: 22px;
  --max: 1280px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background: var(--bg);
}

a {
  color: inherit;
  text-decoration: none;
}

.page {
  width: min(calc(100% - 40px), var(--max));
  margin: 0 auto;
}

.site-header {
  padding: 42px 0 20px;
  text-align: center;
}

.group-logo-wrap {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  padding: 16px 24px;
}

.group-logo-wrap img {
  display: block;
  width: min(100%, 420px);
  height: auto;
}

.intro {
  max-width: 720px;
  margin: 8px auto 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.6;
}

.logo-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 22px;
  padding: 24px 0 56px;
}

.logo-card {
  grid-column: span 4;
  min-height: 200px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 26px;
  transition: transform 0.22s ease, box-shadow 0.22s ease;
}

.logo-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.08);
}

.logo-card img {
  width: 100%;
  max-width: 300px;
  max-height: 130px;
  object-fit: contain;
  display: block;
}

.logo-card.tall img {
  max-height: 150px;
}

.logo-card.wide img {
  max-width: 320px;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 18px 0 30px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}

.site-footer a:hover {
  text-decoration: underline;
}

@media (max-width: 980px) {
  .logo-card {
    grid-column: span 6;
  }
}

@media (max-width: 640px) {
  .page {
    width: min(calc(100% - 24px), var(--max));
  }

  .site-header {
    padding-top: 28px;
  }

  .logo-grid {
    gap: 16px;
    padding-top: 16px;
  }

  .logo-card {
    grid-column: 1 / -1;
    min-height: 170px;
    padding: 20px;
  }

  .logo-card img {
    max-height: 110px;
  }
}