:root {
  --bg: #d9d9d9;
  --bg-soft: #ececec;
  --card: #ffffff;
  --text: #2b2b2b;
  --muted: #666666;
  --accent: #db1820;
  --accent-strong: #b9141b;
  --line: #bfc1c4;
}


* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", sans-serif;
  line-height: 1.7;
  color: var(--text);
  background: linear-gradient(180deg, var(--bg) 0%, #f5f5f5 100%);
}

.container {
  width: min(1080px, 92%);
  margin: 0 auto;
}

.hero {
  padding-bottom: 4.5rem;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(circle at 12% 10%, rgba(219, 24, 32, 0.2) 0%, rgba(219, 24, 32, 0) 45%),
    radial-gradient(circle at 90% 0%, rgba(185, 20, 27, 0.16) 0%, rgba(185, 20, 27, 0) 40%);
}

.nav {
  width: 100%;
}

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid rgba(191, 193, 196, 0.95);
  transition: transform 0.24s ease, opacity 0.24s ease;
}

.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 0;
}

.site-nav.is-hidden {
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
}

.logo {
  font-weight: 700;
  letter-spacing: 0.04em;
  margin: 0;
}

.cta {
  text-decoration: none;
  color: #ffffff;
  background: var(--accent);
  padding: 0.55rem 1rem;
  border-radius: 999px;
  font-weight: 700;
}

.hero-content {
  padding: 4rem 0 1rem;
}

.tag {
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  line-height: 1.3;
}

h1 {
  font-size: clamp(2rem, 7vw, 3.2rem);
  margin: 0.4rem 0 1rem;
}

h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.35rem, 4vw, 2rem);
}

.hero-actions {
  margin-top: 1.4rem;
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.button {
  text-decoration: none;
  border-radius: 999px;
  padding: 0.6rem 1.1rem;
  font-weight: 700;
}

.button.primary {
  background: var(--accent-strong);
  color: #ffffff;
}

.button.ghost {
  border: 1px solid var(--line);
  color: var(--text);
}

.section {
  padding: 3.6rem 0;
}

.alt {
  background: var(--bg-soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem;
}

.news-list {
  margin: 0;
  padding-left: 1.1rem;
}

.news-list li {
  margin-bottom: 0.55rem;
}

.news-list span {
  display: inline-block;
  min-width: 6.5rem;
  color: var(--accent);
  font-weight: 700;
}

.join {
  text-align: center;
}

.join .note {
  color: var(--muted);
  margin: 0 auto 1.4rem;
}

.join .button {
  display: inline-block;
}

.note {
  color: var(--muted);
}

.footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
  padding: 1.2rem 0 2rem;
}

@media (max-width: 640px) {
  .hero-content {
    padding-top: 2.4rem;
  }

  .news-list span {
    min-width: 5.8rem;
  }
}