* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: #f1f5f9;
}

body {
  min-height: 100vh;
  margin: 0;
  color: #0f172a;
  background: #f1f5f9;
  font-family: Arial, "Noto Sans JP", sans-serif;
}

.staging-login {
  display: flex;
  min-height: 100vh;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
}

.staging-login__card {
  width: 100%;
  max-width: 448px;
  padding: 32px;
  border: 1px solid #e2e8f0;
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 24px 48px rgba(15, 23, 42, 0.12);
}

.staging-login__header {
  margin-bottom: 28px;
}

.staging-login__eyebrow {
  margin: 0;
  color: #005792;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.24em;
  line-height: 1.4;
  text-transform: uppercase;
}

.staging-login h1 {
  margin: 8px 0 0;
  color: #0f172a;
  font-size: 28px;
  font-weight: 900;
  line-height: 1.2;
}

.staging-login__field {
  display: block;
  margin-top: 20px;
  color: #64748b;
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.12em;
  line-height: 1.4;
  text-transform: uppercase;
}

.staging-login__field input {
  display: block;
  width: 100%;
  height: 48px;
  margin-top: 8px;
  padding: 0 16px;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  color: #0f172a;
  background: #fff;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0;
  outline: none;
  text-transform: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.staging-login__field input:focus {
  border-color: #005792;
  box-shadow: 0 0 0 4px rgba(0, 87, 146, 0.12);
}

.staging-login__error {
  margin: 16px 0 0;
  padding: 12px 14px;
  border: 1px solid #fee2e2;
  border-radius: 12px;
  color: #dc2626;
  background: #fef2f2;
  font-size: 13px;
  font-weight: 800;
  line-height: 1.5;
}

.staging-login__button {
  width: 100%;
  height: 48px;
  margin-top: 28px;
  border: 0;
  border-radius: 12px;
  color: #fff;
  background: #005792;
  box-shadow: 0 14px 28px rgba(0, 87, 146, 0.18);
  cursor: pointer;
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transition: background 0.2s, opacity 0.2s;
}

.staging-login__button:hover {
  background: #004a7c;
}

.staging-login__button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

@media (max-width: 520px) {
  .staging-login {
    padding: 24px 16px;
  }

  .staging-login__card {
    padding: 28px 22px;
    border-radius: 16px;
  }
}