:root {
  --me-bg: #ffffff;
  --me-text: #171717;
  --me-muted: #777;
  --me-line: #ded8cf;
  --me-white: #fff;
}

body {
  background: var(--me-bg);
  color: var(--me-text);
}

a.link {
  color: rgb(93, 92, 92);
  border-bottom: 1px solid gray;
}

.rd-page {
  padding-top: 4.5rem;
  padding-bottom: 6rem;
}

.rd-intro {
  max-width: 1050px;
  margin-bottom: 5rem;
}

.rd-label {
  font-size: 0.9rem;
  color: var(--me-muted);
  letter-spacing: 0.02em;
  margin-bottom: 1.5rem;
}

.rd-title {
  font-size: clamp(2.5rem, 6vw, 5.8rem);
  font-weight: 400;
  line-height: 0.95;
  letter-spacing: -0.05em;
  margin-bottom: 1.75rem;
}

.rd-subtitle {
  max-width: 760px;
  font-size: clamp(1.15rem, 2vw, 1.65rem);
  line-height: 1.35;
  color: #333;
  font-weight: 400;
}

.rd-system:last-of-type {
  border-bottom: 1px solid var(--me-line);
}

.rd-system {
  display: grid;
  grid-template-columns: minmax(280px, 0.95fr) minmax(320px, 1.05fr);
  gap: clamp(2rem, 6vw, 6rem);
  align-items: end;
  padding: 5rem 0;
  border-top: 1px solid var(--me-line);
}

.rd-image img {
  display: block;
  width: 100%;
  height: auto;
  transition: transform .35s ease;
}

.rd-system:hover .rd-image img {
  transform: scale(1.025);
}

.rd-number {
  color: var(--me-muted);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.rd-system-title {
  font-size: clamp(1.75rem, 2.8vw, 3rem);
  font-weight: 400;
  line-height: 1.08;
  letter-spacing: -0.012em;
  margin-bottom: 1.2rem;
}

.rd-text {
  max-width: 620px;
  font-size: 1.08rem;
  line-height: 1.6;
  color: #333;
  margin-bottom: 1.8rem;
}

.rd-meta {
  list-style: none;
  padding: 0;
  margin: 0 0 2rem 0;
  color: var(--me-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.rd-link:hover {
  color: var(--me-text);
  text-decoration: none;
}

.seo-section {
  max-width: 980px;
  padding: 5rem 0 0;
}

.seo-section h2 {
  font-size: clamp(2rem, 4vw, 4rem);
  font-weight: 400;
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin-bottom: 1.6rem;
}

.seo-section h3 {
  font-size: 1.35rem;
  font-weight: 500;
  margin-top: 2.2rem;
  margin-bottom: 0.8rem;
}

.seo-section p,
.seo-section li {
  font-size: 1.05rem;
  line-height: 1.7;
  color: #333;
}

.keyword-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin-top: 2.5rem;
}

.keyword-box {
  padding: 3%;
  border-top: 1px solid var(--me-line);
}

@media (max-width: 900px) {
  .rd-page {
    padding-top: 3rem;
  }

  .rd-system,
  .keyword-grid {
    grid-template-columns: 1fr;
  }

  .rd-system {
    padding: 3.5rem 0;
  }

  .rd-title {
    letter-spacing: -0.04em;
  }
}