:root {
  --bg: #0b0c10;
  --card: #12131a;
  --text: #e6e6e6;
  --muted: #a9acb3;
  --accent: #6aa6ff;
  --accent-pressed: #4e8ef0;
  --ring: rgba(106, 166, 255, 0.35);
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans JP", sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 800px at 70% -10%, #1a2233, var(--bg));
}

.container {
  max-width: 560px;
  margin: 8vh auto;
  padding: 0 20px;
  text-align: center;
}

.title {
  margin: 0 0 8px;
  font-size: 32px;
  letter-spacing: .02em;
}

.lead {
  margin: 0 0 24px;
  color: var(--muted);
}

.card {
  background: var(--card);
  border: 1px solid #1f2430;
  border-radius: 20px;
  padding: 24px;
  box-shadow: 0 10px 30px rgba(0,0,0,.35);
}

.choices {
  display: grid;
  gap: 12px;
  margin-bottom: 18px;
}

.choice {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border: 1px solid #242a36;
  border-radius: 14px;
  cursor: pointer;
  transition: border-color .15s ease, box-shadow .15s ease, transform .05s ease;
}

.choice:hover {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--ring);
}

.choice input[type="radio"] {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

.btn {
  width: 100%;
  display: inline-block;
  padding: 12px 16px;
  border-radius: 12px;
  border: 1px solid transparent;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  letter-spacing: .02em;
  cursor: pointer;
  transition: transform .05s ease, background .15s ease, box-shadow .15s ease;
}

.btn:hover { background: var(--accent-pressed); }
.btn:active { transform: translateY(1px); }

.btn.ghost {
  background: transparent;
  border-color: #2a3140;
  color: var(--text);
}

.btn-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 10px;
}

.note {
  margin-top: 16px;
  color: var(--muted);
  font-size: 13px;
}