:root {
  --bg: #f5f8fc;
  --surface: rgba(255, 255, 255, 0.94);
  --surface-strong: #ffffff;
  --text: #132238;
  --sub: #5b6b80;
  --line: #d9e2ec;
  --primary: #1658d3;
  --primary-soft: #e8f0ff;
  --accent: #0d8aa5;
  --warning-bg: #fff6df;
  --warning-line: #f0d89b;
  --shadow: 0 18px 42px rgba(19, 34, 56, 0.08);
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html {
  -webkit-overflow-scrolling: touch;
  overflow-y: scroll;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(120, 194, 255, 0.18), transparent 32%),
    radial-gradient(circle at top right, rgba(22, 88, 211, 0.08), transparent 26%),
    linear-gradient(180deg, #eef6ff 0, #f4f8fc 220px, var(--bg) 100%);
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue",
    "Hiragino Sans", "Yu Gothic", sans-serif;
  line-height: 1.75;
  touch-action: pan-y;
  overflow-x: hidden;
  min-height: 100%;
}

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

.wrap {
  max-width: 980px;
  margin: 0 auto;
  padding: 28px 16px 72px;
}

.breadcrumb {
  margin: 0 0 18px;
  color: var(--sub);
  font-size: 14px;
}

.hero,
.card,
.link-card {
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--surface);
  box-shadow: var(--shadow);
  /* backdrop-filter はAndroid WebViewでスクロールをブロックする場合があるため削除 */
  /* backdrop-filter: blur(10px); */
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
}

.hero {
  padding: 32px 28px;
  margin-bottom: 18px;
}

.card {
  padding: 24px;
  margin-bottom: 14px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0 0 12px;
  line-height: 1.28;
}

h1 {
  font-size: 34px;
}

h2 {
  font-size: 22px;
}

h3 {
  font-size: 18px;
}

p,
li {
  margin: 0 0 10px;
}

ul {
  margin: 10px 0 0;
  padding-left: 20px;
}

.lead {
  margin-bottom: 10px;
  font-size: 18px;
  font-weight: 600;
}

.sub,
.note,
.meta {
  color: var(--sub);
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin-top: 18px;
  font-size: 14px;
}

.button-row,
.link-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button-row {
  margin-top: 18px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--primary) 0, #2b7dff 100%);
  color: #ffffff;
  text-decoration: none;
  font-weight: 700;
}

.button.secondary {
  background: var(--primary-soft);
  color: var(--primary);
}

.link-grid {
  margin-top: 16px;
}

.link-card {
  flex: 1 1 260px;
  padding: 18px;
  color: inherit;
  text-decoration: none;
}

.link-card h3 {
  margin-bottom: 8px;
}

.link-card:hover {
  border-color: #bfd2ea;
}

.warning {
  padding: 14px 16px;
  border: 1px solid var(--warning-line);
  border-radius: 16px;
  background: var(--warning-bg);
}

code {
  padding: 2px 6px;
  border-radius: 8px;
  background: #eff4fb;
  font-family: "SFMono-Regular", "Menlo", "Consolas", monospace;
  font-size: 0.95em;
}

.footnote {
  margin-top: 8px;
  color: var(--sub);
  font-size: 14px;
}

@media (max-width: 640px) {
  .wrap {
    padding: 20px 14px 56px;
  }

  .hero,
  .card,
  .link-card {
    border-radius: 20px;
  }

  .hero {
    padding: 24px 20px;
  }

  .card,
  .link-card {
    padding: 20px 18px;
  }

  h1 {
    font-size: 28px;
  }

  h2 {
    font-size: 20px;
  }

  .lead {
    font-size: 17px;
  }
}