:root {
  --mist: #f0f5ff;
  --ink: #0f1a30;
  --muted: #5d6b82;
  --cobalt: #3d6beb;
  --line: rgba(15, 26, 48, 0.11);
  --surface: #ffffff;
}

* { box-sizing: border-box; }

html { background: var(--mist); }

body {
  margin: 0;
  color: var(--ink);
  background: var(--mist);
  font-family: ui-rounded, "Hiragino Sans", "Noto Sans JP", sans-serif;
  line-height: 1.7;
}

a { color: inherit; }

.site-header,
.site-footer,
.content,
.home {
  width: min(960px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  color: var(--ink);
  text-decoration: none;
  font-size: 1.1rem;
  font-weight: 800;
}

.site-nav { display: flex; gap: 16px; font-size: 0.9rem; }
.site-nav a { color: var(--muted); text-decoration: none; }
.site-nav a:hover { color: var(--cobalt); }

.home {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.8fr);
  gap: 64px;
  align-items: center;
  padding: 72px 0 92px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--cobalt);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

h1, h2 { line-height: 1.25; letter-spacing: 0; }
h1 { margin: 0; font-size: clamp(2.5rem, 7vw, 4.75rem); }
h2 { margin: 0 0 14px; font-size: 1.35rem; }

.lead { margin: 22px 0 0; color: var(--muted); font-size: 1.08rem; }

.screen {
  overflow: hidden;
  background: #dfeaff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 20px 50px rgba(15, 26, 48, 0.12);
}

.screen img { display: block; width: 100%; height: auto; }

.screen-caption { margin: 10px 0 0; color: var(--muted); font-size: 0.82rem; text-align: center; }

.feature-grid {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}

.feature {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.feature p { margin: 0; color: var(--muted); font-size: 0.92rem; }

.content { max-width: 760px; padding: 52px 0 88px; }
.content > p { color: var(--muted); }
.content h2 { margin-top: 42px; }
.content li { margin: 8px 0; color: var(--muted); }

.notice {
  margin: 28px 0;
  padding: 18px 20px;
  color: var(--ink);
  background: var(--surface);
  border-left: 4px solid var(--cobalt);
}

.contact {
  display: inline-block;
  margin-top: 6px;
  color: var(--cobalt);
  font-weight: 700;
}

.site-footer {
  padding: 28px 0 38px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.82rem;
}

@media (max-width: 720px) {
  .site-header { min-height: 66px; }
  .site-nav { gap: 12px; font-size: 0.78rem; }
  .home { grid-template-columns: 1fr; gap: 38px; padding: 46px 0 64px; }
  .feature-grid { grid-template-columns: 1fr; }
}