:root {
  --bg: #ffffff;
  --fg: #111827;
  --muted: #5f6b7a;
  --primary: #0047ab;
  --primary-hover: #003a8c;
  --line: #e5e8ee;
  --card: #ffffff;
  --card-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
  --radius: 12px;
  --maxw: 680px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic UI",
    "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

body.lang-ja .en,
body.lang-en .ja {
  display: none;
}

.lang-switch {
  position: absolute;
  top: 20px;
  right: 24px;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--muted);
}

.lang-switch button {
  appearance: none;
  background: transparent;
  border: none;
  padding: 4px 6px;
  font: inherit;
  color: var(--muted);
  cursor: pointer;
  letter-spacing: 0.04em;
}

.lang-switch button[aria-pressed="true"] {
  color: var(--primary);
  font-weight: 600;
}

.lang-switch button:hover {
  color: var(--primary);
}

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 72px 24px 96px;
}

.hero {
  padding: 8px 0 32px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 40px;
}

h1 {
  margin: 0 0 8px;
  font-size: 32px;
  letter-spacing: 0.02em;
  color: var(--primary);
}

.tagline {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

section {
  margin-bottom: 40px;
}

h2 {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--primary);
  margin: 0 0 12px;
}

h3 {
  margin: 0 0 4px;
  font-size: 17px;
  font-weight: 600;
}

p {
  margin: 0 0 12px;
  color: var(--fg);
}

.apps {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 16px;
}

.apps li {
  display: flex;
  gap: 16px;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
  box-shadow: var(--card-shadow);
}

.app-icon {
  width: 72px;
  height: 72px;
  flex: none;
  border-radius: 16px;
  box-shadow:
    0 1px 2px rgba(15, 23, 42, 0.08),
    inset 0 0 0 1px rgba(15, 23, 42, 0.05);
  object-fit: cover;
  background: #f3f4f6;
}

.app-body {
  flex: 1;
  min-width: 0;
}

.apps p {
  margin: 4px 0 14px;
  color: var(--muted);
  font-size: 14.5px;
}

.store-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px 7px 12px;
  background: #000;
  color: #fff;
  border-radius: 9px;
  text-decoration: none;
  line-height: 1;
  transition: background-color 0.15s ease;
}

.store-badge:hover {
  background: #1f1f1f;
}

.store-badge .apple-logo {
  width: 22px;
  height: 22px;
  fill: currentColor;
  flex: none;
}

.badge-text {
  display: inline-flex;
  flex-direction: column;
  gap: 2px;
}

.badge-text small {
  font-size: 9px;
  line-height: 1;
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  opacity: 0.95;
}

.badge-text strong {
  font-size: 17px;
  line-height: 1;
  font-weight: 600;
  letter-spacing: 0.005em;
}

.info {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.info-row {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 16px;
  padding: 14px 4px;
  border-bottom: 1px solid var(--line);
}

.info dt {
  margin: 0;
  color: var(--muted);
  font-size: 13.5px;
  font-weight: 500;
}

.info dd {
  margin: 0;
  color: var(--fg);
  font-size: 14.5px;
  word-break: break-word;
}

.info a {
  color: var(--primary);
  text-decoration: none;
  border-bottom: 1px solid var(--primary);
}

.info a:hover {
  color: var(--primary-hover);
  border-bottom-color: var(--primary-hover);
}

footer {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

@media (max-width: 480px) {
  main {
    padding: 56px 20px 64px;
  }
  h1 {
    font-size: 26px;
  }
  .lang-switch {
    top: 16px;
    right: 16px;
  }
  .apps li {
    gap: 14px;
    padding: 16px 16px;
  }
  .app-icon {
    width: 60px;
    height: 60px;
    border-radius: 13px;
  }
  .info-row {
    grid-template-columns: 110px 1fr;
    gap: 12px;
  }
}