:root {
  --bg: #0d0b14;
  --bg-soft: #141121;
  --card: #1a1626;
  --border: #2a2440;
  --text: #ece9f5;
  --muted: #a39fb8;
  --accent: #8b5cf6;
  --accent-grad: linear-gradient(135deg, #a855f7 0%, #ec4899 100%);
  --radius: 16px;
  --maxw: 1040px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Noto Sans JP", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---- Header ---- */
header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(140%) blur(12px);
  background: rgba(13, 11, 20, 0.72);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; }
.brand img { width: 28px; height: 28px; border-radius: 7px; }
.nav-right { display: flex; align-items: center; gap: 18px; font-size: 14px; color: var(--muted); }
.nav-right a:hover { color: var(--text); }
.lang { display: inline-flex; gap: 6px; }
.lang a { padding: 4px 8px; border-radius: 8px; border: 1px solid var(--border); }
.lang a.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* ---- Hero ---- */
.hero { text-align: center; padding: 88px 0 64px; position: relative; }
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(60% 50% at 50% 0%, rgba(168, 85, 247, 0.22), transparent 70%);
  pointer-events: none;
}
.hero img.app-icon { width: 112px; height: 112px; border-radius: 24px; box-shadow: 0 20px 60px rgba(168,85,247,0.35); }
.hero h1 {
  font-size: clamp(34px, 6vw, 56px);
  line-height: 1.12;
  margin: 28px 0 16px;
  letter-spacing: -0.02em;
  font-weight: 800;
}
.hero p.sub {
  font-size: clamp(17px, 2.4vw, 20px);
  color: var(--muted);
  max-width: 640px;
  margin: 0 auto 32px;
}
.cta { display: inline-flex; align-items: center; gap: 10px; }
.btn-primary {
  display: inline-flex; align-items: center; gap: 10px;
  background: var(--accent-grad);
  color: #fff;
  font-weight: 700;
  font-size: 17px;
  padding: 15px 28px;
  border-radius: 999px;
  box-shadow: 0 10px 30px rgba(168,85,247,0.4);
  transition: transform .12s ease, box-shadow .12s ease;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 38px rgba(168,85,247,0.5); }
.req { margin-top: 14px; font-size: 14px; color: var(--muted); }

/* ---- Shot ---- */
.shot { margin: 8px auto 0; max-width: 920px; }
.shot-frame {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-soft);
  box-shadow: 0 30px 80px rgba(0,0,0,0.5);
}
.shot-frame img { display: block; width: 100%; height: auto; }
.shot-placeholder {
  aspect-ratio: 16 / 10;
  display: flex; align-items: center; justify-content: center;
  color: var(--muted); font-size: 14px;
  background:
    repeating-linear-gradient(45deg, rgba(255,255,255,0.02) 0 12px, transparent 12px 24px);
}

/* ---- Features ---- */
.features { padding: 80px 0; }
.features h2 { text-align: center; font-size: clamp(26px, 4vw, 36px); margin: 0 0 48px; letter-spacing: -0.01em; }
.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
}
.card .ic { font-size: 26px; margin-bottom: 14px; }
.card h3 { margin: 0 0 8px; font-size: 19px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }

/* ---- Footer ---- */
footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  color: var(--muted);
  font-size: 14px;
}
.foot { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.foot a:hover { color: var(--text); }

@media (max-width: 760px) {
  .grid { grid-template-columns: 1fr; }
  .hero { padding: 56px 0 40px; }
}