:root {
  --bg: #fff;
  --ink: #121212;
  --soft: #6f6f6f;
  --line: #e8e8e8;
  --max: 1040px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;
  line-height: 1.8;
}

.container {
  width: min(100% - 3rem, var(--max));
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 2rem 0;
}

.brand {
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.16em;
  font-size: clamp(1.15rem, 2.2vw, 1.45rem);
}

.nav-list {
  list-style: none;
  display: flex;
  gap: 1.25rem;
  margin: 0;
  padding: 0;
}

.nav-list a {
  text-decoration: none;
  color: var(--soft);
  font-size: 0.95rem;
}

.nav-list a[aria-current="page"],
.nav-list a:hover {
  color: var(--ink);
}

.hero {
  padding: 12vh 0 14vh;
}

.eyebrow {
  margin: 0;
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--soft);
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.28;
  font-weight: 500;
}

h1 {
  margin-top: 0.6rem;
  font-size: clamp(2.35rem, 9vw, 6.5rem);
}

h2 {
  font-size: clamp(1.35rem, 3vw, 2.05rem);
}

h3 {
  font-size: 1.15rem;
}

.tagline {
  margin-top: 1.2rem;
  font-size: clamp(1rem, 2.2vw, 1.45rem);
  color: var(--soft);
}

.section,
.page-main {
  padding: 3.6rem 0;
  border-top: 1px solid var(--line);
}

.page-main {
  min-height: 62vh;
}

.lead {
  margin: 1rem 0 0;
  color: var(--soft);
  font-size: 1.08rem;
  max-width: 66ch;
}

p {
  margin: 0.9rem 0 0;
  max-width: 72ch;
}

.link-grid {
  margin-top: 1.5rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.link-card {
  padding: 1.25rem;
  border: 1px solid var(--line);
}

.link-card a,
.simple-link {
  display: inline-block;
  margin-top: 0.7rem;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--ink);
}

.text-block + .text-block {
  margin-top: 2.5rem;
}

.work-list {
  margin-top: 1.4rem;
  border-top: 1px solid var(--line);
}

.work-item {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--line);
}

.tool-list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.tool-list li {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding: 0.95rem 0;
  border-bottom: 1px solid var(--line);
}

.tool-list small {
  color: var(--soft);
}

.site-footer {
  padding: 2rem 0 2.8rem;
  color: var(--soft);
}

@media (max-width: 820px) {
  .link-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(100% - 2rem, var(--max));
  }

  .site-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

  .hero {
    padding: 8vh 0 10vh;
  }

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

  .section,
  .page-main {
    padding: 2.8rem 0;
  }
}