/* ログイン画面（入口＝ヒーロー闇固定・nexbrand の入口3画面の作法を素の CSS に転写） */
:root { color-scheme: dark; }
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: radial-gradient(1200px 600px at 50% -10%, #1d2433 0%, #0d1016 60%) #0d1016;
  color: #e6e8ec;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  display: flex; align-items: center; justify-content: center;
  padding: 16px;
}
.hero { width: 100%; max-width: 440px; text-align: center; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-size: 26px; font-weight: 700; letter-spacing: .02em; color: #fff; }
.lead { margin: 18px 0 28px; color: #b9bfca; line-height: 1.7; }
.gbtn {
  display: flex; align-items: center; justify-content: center; gap: 12px;
  width: 100%; height: 52px; border-radius: 10px;
  background: #fff; color: #1f2328; text-decoration: none; font-weight: 600; font-size: 15px;
  box-shadow: 0 1px 0 rgba(255,255,255,.08), 0 8px 24px rgba(0,0,0,.35);
}
.gbtn:hover { background: #f1f3f5; }
.gbtn:focus-visible { outline: 3px solid #4f8cff; outline-offset: 3px; }
.note { margin-top: 16px; font-size: 13px; color: #8f96a3; line-height: 1.7; }
.error { margin: 0 0 16px; padding: 10px 12px; border-radius: 8px; background: #3a1d22; color: #ffb4bb; font-size: 13px; text-align: left; }
.error.info { background: #1d2a3a; color: #b9d3ff; }
.legal { margin-top: 18px; font-size: 13px; color: #8f96a3; }
.legal a { color: #b9bfca; }
.legal-note { margin-top: 4px; font-size: 11px; color: #6f7684; }