.page {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3rem 1rem;
  position: relative;
}
.page::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    ellipse 60% 60% at 50% 40%,
    rgba(255, 149, 0, 0.05) 0%,
    transparent 60%
  );
  pointer-events: none;
}
.card {
  width: 100%;
  max-width: 420px;
  position: relative;
  z-index: 1;
}
.card-header {
  margin-bottom: 2rem;
  text-align: center;
}
.card-title {
  font-family: "Bebas Neue", sans-serif;
  font-size: 2.4rem;
  letter-spacing: 0.1em;
  line-height: 1;
}
.card-title em {
  color: var(--amber);
  font-style: normal;
}
.card-sub {
  font-family: "Space Mono", monospace;
  font-size: 0.58rem;
  letter-spacing: 0.2em;
  color: var(--muted);
  text-transform: uppercase;
  margin-top: 0.4rem;
}
.card-body {
  background: var(--bg2);
  border: 1px solid var(--border);
  padding: 2rem;
}
input {
  background: var(--input-bg);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: "Noto Sans JP", sans-serif;
  font-size: 0.9rem;
  padding: 0.75rem 1rem;
  outline: none;
  transition: border-color 0.2s;
  width: 100%;
}
input:focus {
  border-color: var(--amber);
  background: #111526;
}
input::placeholder {
  color: var(--muted);
  font-size: 0.8rem;
}
.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 1.5rem 0;
}
.card-footer {
  text-align: center;
  margin-top: 1.5rem;
  font-size: 0.78rem;
  color: var(--muted);
}
.card-footer a {
  color: var(--amber);
  text-decoration: none;
}
.err-box p {
  font-size: 0.72rem;
  color: var(--red);
}
.err-box p::before {
  content: "▸ ";
}
/* フラッシュメッセージ */
.flash-ok {
  background: rgba(52, 211, 153, 0.07);
  border: 1px solid rgba(52, 211, 153, 0.25);
  padding: 0.8rem 1rem;
  margin-bottom: 1.2rem;
  font-size: 0.75rem;
  color: #34d399;
}