:root {
  --bg: #ffffff;
  --bg-alt: #f5f7fa;
  --text: #1c2430;
  --muted: #5b6675;
  --line: #e3e8ef;
  --accent: #1f7a5c;
  --accent-soft: #e7f4ee;
  --radius: 12px;
  --max: 1080px;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Noto Sans CJK JP", Meiryo, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); }
.container { max-width: var(--max); margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 760px; }
.narrow-text { max-width: 760px; }
.center { text-align: center; }

.site-header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { font-weight: 700; font-size: 1.25rem; letter-spacing: 0.02em; color: var(--text); text-decoration: none; }
.nav { display: flex; gap: 24px; align-items: center; }
.nav a { color: var(--muted); text-decoration: none; font-size: 0.92rem; }
.nav a:hover { color: var(--accent); }
.nav .lang-link {
  border: 1px solid var(--line); border-radius: 999px; padding: 2px 12px;
  font-weight: 600; color: var(--text);
}

.hero {
  padding: 96px 0 88px;
  background: linear-gradient(180deg, var(--accent-soft) 0%, #ffffff 100%);
  border-bottom: 1px solid var(--line);
}
.eyebrow {
  margin: 0 0 12px; color: var(--accent); font-weight: 700;
  font-size: 0.85rem; letter-spacing: 0.12em; text-transform: uppercase;
}
.hero h1 { margin: 0 0 20px; font-size: clamp(1.7rem, 4vw, 2.7rem); line-height: 1.4; letter-spacing: 0.01em; }
.lead { margin: 0 0 32px; font-size: 1.1rem; color: var(--muted); }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 12px 24px; border-radius: 999px;
  font-weight: 600; text-decoration: none; font-size: 0.95rem;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #17604a; }
.btn-ghost { border: 1px solid var(--line); background: #fff; color: var(--text); }

.section { padding: 80px 0; }
.section-alt { background: var(--bg-alt); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section h2 { margin: 0 0 24px; font-size: 1.6rem; }
.section .sub { margin: 40px 0 20px; font-size: 1.2rem; }
.section p { margin: 0 0 16px; }
.section-en { border-bottom: 1px solid var(--line); }

.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; box-shadow: 0 1px 2px rgba(16,24,40,0.04);
}
.card h3 { margin: 12px 0 8px; font-size: 1.05rem; line-height: 1.5; }
.card p { margin: 0; color: var(--muted); font-size: 0.93rem; }
.card-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; border-radius: 10px;
  background: var(--accent-soft); color: var(--accent); font-weight: 700; font-size: 0.9rem;
}
.card-roadmap { border-color: #bfe0d2; }
.section-en .card { background: var(--bg-alt); }

.contact h2 .en-label { display: block; font-size: 0.9rem; color: var(--muted); font-weight: 500; letter-spacing: 0.08em; }
.email { font-size: 1.3rem; font-weight: 600; margin-top: 8px; }

.site-footer { padding: 32px 0; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.88rem; text-align: center; }
.site-footer p { margin: 0; }

@media (max-width: 960px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .br-wide { display: none; }
  .nav { gap: 12px; }
  .nav a:not(.lang-link):not([href="#contact"]) { display: none; }
  .hero { padding: 64px 0 56px; }
  .section { padding: 56px 0; }
  .cards { grid-template-columns: 1fr; }
}