.account-container { max-width: 520px; margin: 50px auto; padding: 30px; background: white; border-radius: 15px; box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1); }
.account-header { margin-bottom: 24px; text-align: center; }
.account-header h1 { margin-bottom: 10px; color: #f00; font-size: 2rem; }
.account-header p { color: #666; font-size: 1rem; }
.account-section { padding: 20px 0; border-top: 1px solid #eee; }
.account-section h2 { margin: 0 0 14px; color: #333; font-size: 1.1rem; }
.account-section--danger h2 { color: #c00; }
.account-email { margin: 0; color: #333; font-size: 1rem; overflow-wrap: anywhere; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; margin-bottom: 6px; color: #333; font-size: 0.95rem; font-weight: 700; }
.form-group input { box-sizing: border-box; width: 100%; padding: 12px; border: 2px solid #ddd; border-radius: 8px; font-family: 'Noto Sans JP', sans-serif; font-size: 16px; transition: border-color 0.3s ease; }
.form-group input:focus { outline: none; border-color: #f00; }
.form-help { display: block; margin-top: 4px; color: #666; font-size: 12px; }
.account-help { margin: 0 0 14px; color: #555; font-size: 0.9rem; line-height: 1.6; }
.account-check { display: flex; align-items: flex-start; gap: 8px; margin-bottom: 16px; color: #333; font-size: 0.95rem; cursor: pointer; }
.account-check input { margin-top: 3px; width: 18px; height: 18px; flex: none; }
.account-btn { width: 100%; padding: 14px; border: none; border-radius: 8px; background: #f00; color: white; cursor: pointer; font-size: 16px; font-weight: 700; transition: background-color 0.3s ease; }
.account-btn:hover { background: #c00; }
.account-btn--danger { background: white; color: #c00; border: 2px solid #c00; }
.account-btn--danger:hover { background: #fff2f2; }
.account-btn:disabled, .account-btn--danger:disabled { background: #ccc; border-color: #ccc; color: white; cursor: not-allowed; }
.account-message { min-height: 1.4em; margin-top: 10px; }
.account-status { min-height: 0; margin: 0; }
.account-status:not(:empty) { padding: 20px 0; border-top: 1px solid #eee; font-size: 1rem; }
.error-message, .success-message { font-size: 14px; text-align: center; line-height: 1.5; }
.error-message { color: #f00; }
.success-message { color: #28a745; }
.link-button { padding: 0; border: none; background: none; color: #f00; font: inherit; cursor: pointer; text-decoration: underline; }
.back-links { display: flex; justify-content: space-between; gap: 12px; margin-top: 10px; padding-top: 20px; border-top: 1px solid #eee; }
.back-links a { color: #666; text-decoration: none; font-size: 14px; }
.back-links a:hover { color: #f00; }

@media (max-width: 680px) {
  .account-container { margin: 20px 12px; padding: 22px 18px; }
  .account-header h1 { font-size: 1.6rem; }
  .back-links { flex-direction: column; align-items: center; }
}