:root {
  --bg: #f6f8fb;
  --paper: #ffffff;
  --ink: #1f2a37;
  --muted: #5d6b7a;
  --accent: #0f766e;
  --accent-2: #f59e0b;
  --border: #d8e1ea;
  --shadow: 0 14px 30px rgba(19, 33, 53, 0.08);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% -10%, rgba(15, 118, 110, 0.12), transparent 45%),
    radial-gradient(circle at 100% 0%, rgba(245, 158, 11, 0.12), transparent 36%),
    var(--bg);
}

a { color: var(--accent); }

.container {
  width: min(980px, 92vw);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
  background: rgba(246, 248, 251, 0.88);
}

.site-header .row {
  display: flex;
  gap: 14px;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
}

.brand {
  margin: 0;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.nav {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.nav a {
  text-decoration: none;
  font-size: 0.92rem;
}

.hero {
  padding: 72px 0 34px;
  text-align: center;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4.4vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: 0.01em;
}

.lead {
  margin: 16px auto 0;
  color: var(--muted);
  line-height: 1.75;
  max-width: 680px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  font-weight: 700;
}

.mini-points {
  margin: 18px auto 0;
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
}

.mini-points span {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 10px;
  color: var(--muted);
  font-size: 0.82rem;
}

.hero-cta {
  margin: 20px 0 0;
}

.grid {
  display: grid;
  gap: 14px;
}

.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.card {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 18px;
}

.card h2, .card h3 {
  margin: 0;
  font-size: 1.06rem;
}

.card p, .card li {
  color: var(--muted);
  line-height: 1.7;
}

.section {
  margin: 30px 0;
}

.section h2 {
  margin: 0 0 14px;
  font-size: 1.36rem;
  text-align: center;
}

.btn {
  display: inline-block;
  text-decoration: none;
  border-radius: 999px;
  padding: 10px 16px;
  font-weight: 700;
  font-size: 0.92rem;
}

.btn.primary {
  background: linear-gradient(135deg, var(--accent), #0ea5a7);
  color: #fff;
}

.btn.ghost {
  color: var(--accent);
  border: 1px solid var(--border);
  background: #fff;
}

.meta {
  color: var(--muted);
  font-size: 0.88rem;
}

.feature-panel {
  margin-top: 40px;
}

.cta-card {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 26px 20px;
  text-align: center;
}

.cta-card h2 {
  margin-bottom: 8px;
}

.cta-card p {
  color: var(--muted);
}

.doc {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 18px;
  margin: 20px 0 36px;
}

.doc h1 {
  font-size: clamp(1.4rem, 3vw, 2rem);
}

.doc h2 {
  margin: 22px 0 8px;
  font-size: 1.08rem;
}

.doc p, .doc li {
  color: var(--muted);
  line-height: 1.75;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 14px 0 30px;
  color: var(--muted);
  font-size: 0.88rem;
}

.links {
  display: flex;
  gap: 10px 14px;
  flex-wrap: wrap;
}

@media (max-width: 860px) {
  .grid.two, .grid.three { grid-template-columns: 1fr; }
  .site-header .row { align-items: flex-start; }
  .hero { text-align: left; }
  .section h2 { text-align: left; }
  .mini-points { justify-content: flex-start; }
  .cta-card { text-align: left; }
}