:root {
  color-scheme: light;
  --bg: #f4f7ff;
  --surface: #ffffff;
  --surface-soft: #eef3ff;
  --text: #1f2a44;
  --muted: #64748b;
  --primary: #3b82f6;
  --primary-dark: #1d4ed8;
  --border: #d9e4ff;
  --shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Hiragino Sans", "Yu Gothic UI", "Noto Sans JP", sans-serif;
  color: var(--text);
  background: linear-gradient(135deg, #f8fbff 0%, var(--bg) 100%);
  line-height: 1.8;
}

a {
  color: var(--primary-dark);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.hero {
  background: linear-gradient(120deg, #1d4ed8 0%, #3b82f6 100%);
  color: #ffffff;
  padding: 64px 20px 56px;
}

.container {
  width: min(92%, 960px);
  margin: 0 auto;
}

.hero .container {
  max-width: 800px;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 12px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.16);
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0 0 12px;
  font-size: clamp(1.8rem, 2.8vw, 2.7rem);
  line-height: 1.2;
}

.hero p {
  margin: 0;
  font-size: 1.02rem;
  opacity: 0.95;
}

.hero-actions {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-block;
  padding: 12px 18px;
  border-radius: 999px;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
  text-decoration: none;
}

.btn-primary {
  background: #ffffff;
  color: var(--primary-dark);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.16);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.content {
  padding: 28px 0 48px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 24px;
  box-shadow: var(--shadow);
}

.card + .card,
.card + .card-grid {
  margin-top: 20px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.card-grid .card {
  padding: 22px;
}

.card h2,
.card h3 {
  margin-top: 0;
  font-size: 1.2rem;
}

.card ul {
  margin: 12px 0 0;
  padding-left: 20px;
}

.card li + li {
  margin-top: 8px;
}

.page-shell {
  padding: 48px 20px 56px;
}

.page-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 32px;
  box-shadow: var(--shadow);
}

.page-card h1 {
  margin-top: 0;
  font-size: clamp(1.6rem, 2.2vw, 2.2rem);
}

.page-card h2 {
  margin-top: 28px;
  font-size: 1.1rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}

.meta {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 24px;
}

.support-email {
  display: inline-block;
  margin: 4px 0 0;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-soft);
  font-weight: 600;
}

.email-note {
  color: var(--muted);
  font-size: 0.9rem;
}

.email-template {
  overflow-x: auto;
  margin: 0;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface-soft);
  font: inherit;
  white-space: pre-wrap;
}

.page-links {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 12px;
}

footer {
  text-align: center;
  color: var(--muted);
  padding: 0 20px 32px;
  font-size: 0.95rem;
}

@media (max-width: 760px) {
  .card-grid {
    grid-template-columns: 1fr;
  }

  .page-card {
    padding: 24px;
  }
}