* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --bg-top: #232b3f;
  --bg-mid: #141926;
  --bg-bot: #0b0e16;
  --accent: #8fb5ff;
  --text: #ffffff;
  --text-dim: rgba(255, 255, 255, 0.66);
  --card: rgba(255, 255, 255, 0.06);
  --card-border: rgba(255, 255, 255, 0.1);
}
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Hiragino Sans", system-ui, sans-serif;
  background: radial-gradient(130% 120% at 50% -10%, var(--bg-top) 0%, var(--bg-mid) 50%, var(--bg-bot) 100%) fixed;
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
/* language toggle: body carries .lang-ja or .lang-en */
body.lang-ja .i-en { display: none !important; }
body.lang-en .i-ja { display: none !important; }

.wrap { max-width: 960px; margin: 0 auto; padding: 0 24px; }

nav {
  display: flex; align-items: center; gap: 12px;
  padding: 20px 0;
}
nav .brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); }
nav .brand img { width: 36px; height: 36px; }
nav .brand span { font-size: 20px; font-weight: 800; letter-spacing: 0.2px; }
nav .links { margin-left: auto; display: flex; gap: 20px; align-items: center; }
nav .links a { color: var(--text-dim); text-decoration: none; font-size: 14px; font-weight: 600; }
nav .links a:hover { color: var(--text); }
.langbtn {
  border: 1px solid var(--card-border); background: var(--card); color: var(--text);
  border-radius: 100px; padding: 5px 14px; font-size: 13px; font-weight: 700; cursor: pointer;
}

header.hero { text-align: center; padding: 56px 0 36px; }
.hero img.appicon { width: 108px; height: 108px; margin-bottom: 18px; }
.hero h1 { font-size: 44px; font-weight: 800; line-height: 1.25; letter-spacing: -0.5px; }
.hero h1 .accent { color: var(--accent); }
.hero p.tag { margin-top: 14px; font-size: 19px; color: var(--text-dim); }
.hero .badge {
  display: inline-flex; align-items: center; gap: 9px;
  margin-top: 28px; padding: 13px 30px; border-radius: 100px;
  background: linear-gradient(180deg, #a5c4ff 0%, var(--accent) 100%);
  color: #0b0e16; font-weight: 800; font-size: 16px; text-decoration: none;
  box-shadow: 0 10px 30px rgba(143, 181, 255, 0.28);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.hero .badge:hover { transform: translateY(-1px); box-shadow: 0 14px 36px rgba(143, 181, 255, 0.4); }
.hero .badge .badge-icon { width: 15px; height: 18px; flex: none; margin-top: -2px; }
.hero .badge.soon { background: var(--card); color: var(--text-dim); border: 1px solid var(--card-border); box-shadow: none; }
.hero .requirements { margin-top: 14px; font-size: 13px; color: rgba(255, 255, 255, 0.45); }

.shot { margin: 36px auto 8px; max-width: 900px; }
.shot img { width: 100%; border-radius: 14px; box-shadow: 0 30px 90px rgba(0,0,0,0.55), 0 0 0 1px var(--card-border); }

section { padding: 48px 0; }
section h2 { font-size: 28px; font-weight: 800; text-align: center; margin-bottom: 32px; }
.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.card {
  background: var(--card); border: 1px solid var(--card-border); border-radius: 18px;
  padding: 28px 26px;
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}
.card:hover {
  transform: translateY(-3px);
  border-color: rgba(143, 181, 255, 0.35);
  background: rgba(255, 255, 255, 0.09);
}
.card .emoji {
  display: inline-flex; align-items: center; justify-content: center;
  width: 52px; height: 52px; font-size: 26px; border-radius: 14px;
  background: linear-gradient(135deg, rgba(143, 181, 255, 0.22), rgba(143, 181, 255, 0.07));
  border: 1px solid rgba(143, 181, 255, 0.22);
}
.card h3 { font-size: 18px; font-weight: 800; margin: 14px 0 6px; }
.card p { font-size: 14.5px; color: var(--text-dim); }

.prose { max-width: 720px; margin: 0 auto; }
.prose h1 { font-size: 34px; font-weight: 800; margin: 40px 0 20px; }
.prose h2 { font-size: 21px; font-weight: 800; margin: 34px 0 10px; text-align: left; }
.prose p, .prose li { color: var(--text-dim); font-size: 15.5px; }
.prose ul { padding-left: 22px; margin: 8px 0; }
.prose a { color: var(--accent); }
.prose .qa { background: var(--card); border: 1px solid var(--card-border); border-radius: 14px; padding: 18px 20px; margin-bottom: 14px; }
.prose .qa h3 { font-size: 16px; font-weight: 800; margin-bottom: 6px; }
.prose .qa p { font-size: 14.5px; }

footer {
  border-top: 1px solid var(--card-border); margin-top: 40px; padding: 28px 0 40px;
  color: rgba(255,255,255,0.4); font-size: 13px; text-align: center;
}
footer a { color: rgba(255,255,255,0.55); text-decoration: none; margin: 0 8px; }
@media (max-width: 640px) {
  .hero h1 { font-size: 31px; }
  nav .links a.navhide { display: none; }
  .grid { grid-template-columns: 1fr; }
}