:root {
  --ink: #1a1a1a;
  --gray: #7a7a7a;
  --light: #9a9a9a;
  --line: #e8e8e8;
  --brand: #8c0020;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: #fff;
  color: var(--ink);
  font-family: 'Noto Serif SC', 'Songti SC', 'STSong', serif;
  line-height: 1.75;
}

/* ---------- hero ---------- */

.hero {
  max-width: 1080px;
  margin: 0 auto;
  padding: 96px 28px 8px;
  text-align: center;
}

.hero-en {
  margin: 0 0 18px;
  font-family: 'Special Elite', 'Courier New', Courier, monospace;
  font-size: 12px;
  letter-spacing: 0.28em;
  color: #6f6f6f;
}

.hero h1 {
  margin: 0;
  font-size: 44px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.epigraph {
  max-width: 640px;
  margin: 26px auto 0;
  font-size: 13.5px;
  line-height: 2.1;
  color: var(--gray);
}

/* ---------- arcs ---------- */

main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 28px;
}

.arc {
  margin-top: 72px;
}

.arc-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}

.arc-emoji {
  font-size: 20px;
  line-height: 1;
}

.arc-head h2 {
  margin: 0;
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.arc-tagline {
  font-size: 13px;
  color: var(--light);
}

.arc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 22px;
  margin-top: 22px;
}

.card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  background: #fff;
  overflow: hidden;
}

.card-link-page {
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.card-link-page:hover {
  border-color: #b9b9b9;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
}

.card-img {
  aspect-ratio: 3 / 2;
  background: #f6f6f6;
  overflow: hidden;
}

.card-img img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.35s ease;
}

.card-link-page:hover .card-img img {
  transform: scale(1.03);
}

.card-body {
  padding: 14px 16px 16px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-body h3 {
  margin: 0;
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.5;
}

.huming {
  margin: 8px 0 0;
  font-size: 12.5px;
  line-height: 1.9;
  color: var(--gray);
}

.card-enter {
  margin-top: auto;
  padding-top: 10px;
  font-size: 12px;
  color: var(--brand);
}

.arc-note {
  margin: 22px 0 0;
  padding-left: 16px;
  border-left: 2px solid #dcdcdc;
  font-size: 13px;
  line-height: 2.05;
  color: var(--gray);
}

/* ---------- footer ---------- */

footer {
  max-width: 1080px;
  margin: 90px auto 0;
  padding: 22px 28px 48px;
  border-top: 1px solid #f0f0f0;
  text-align: center;
}

footer p {
  margin: 0;
  font-size: 12px;
  color: var(--light);
}

footer a {
  color: #6f6f6f;
  text-decoration: none;
}

footer a:hover {
  color: var(--ink);
  text-decoration: underline;
}

/* ---------- mobile ---------- */

@media (max-width: 700px) {
  .hero {
    padding-top: 64px;
  }

  .hero h1 {
    font-size: 34px;
  }

  .epigraph {
    font-size: 13px;
  }

  main {
    padding: 0 18px;
  }

  .arc {
    margin-top: 56px;
  }

  .arc-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 14px;
  }

  .card-body {
    padding: 12px 13px 13px;
  }

  .card-body h3 {
    font-size: 14.5px;
  }

  .huming {
    font-size: 12px;
  }
}