.profile-container { max-width: 600px; margin: 50px auto; padding: 30px; background: white; border-radius: 15px; box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1); }
.profile-header { margin-bottom: 30px; text-align: center; }
.profile-header h1 { margin-bottom: 10px; color: #f00; font-size: 2rem; }
.profile-header p { color: #666; font-size: 1rem; }
.form-group { margin-bottom: 25px; }
.form-group label { display: block; margin-bottom: 8px; color: #333; font-size: 1rem; font-weight: 700; }
.form-group input, .form-group textarea, .form-group select { 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, .form-group textarea:focus, .form-group select:focus { outline: none; border-color: #f00; }
.form-group textarea { min-height: 100px; resize: vertical; }
.thumbnail-section { margin-bottom: 25px; text-align: center; }
.thumbnail-preview-button { display: inline-flex; padding: 0; border: 0; border-radius: 50%; background: transparent; cursor: pointer; }
.thumbnail-preview-button:focus-visible { outline: 3px solid #f00; outline-offset: 3px; }
.thumbnail-preview { width: 120px; height: 120px; margin-bottom: 15px; border: 3px solid #ddd; border-radius: 50%; object-fit: cover; transition: border-color 0.3s ease; }
.thumbnail-preview-button:hover .thumbnail-preview { border-color: #f00; }
.thumbnail-upload { display: none; }
.upload-btn { padding: 10px 20px; border: none; border-radius: 25px; background: #f00; color: white; cursor: pointer; font-size: 14px; font-weight: 700; transition: background-color 0.3s ease; }
.upload-btn:hover { background: #c00; }
.upload-btn:disabled { background: #ccc; cursor: not-allowed; }
.save-btn, .logout-btn { width: 100%; padding: 15px; border: none; border-radius: 8px; color: white; cursor: pointer; font-size: 16px; font-weight: 700; transition: background-color 0.3s ease; }
.save-btn { margin-top: 20px; background: #f00; }
.save-btn:hover { background: #c00; }
.logout-btn { margin-top: 15px; background: #666; }
.logout-btn:hover { background: #555; }
.save-btn:disabled, .logout-btn:disabled { background: #ccc; cursor: not-allowed; }
.error-message, .success-message { margin-top: 10px; font-size: 14px; text-align: center; }
.error-message { color: #f00; }
.success-message { color: #28a745; }
.back-to-home { margin-top: 20px; text-align: center; }
.back-to-home a { color: #666; text-decoration: none; font-size: 14px; }
.back-to-home a:hover { color: #f00; }
.loading { display: inline-block; width: 20px; height: 20px; border: 3px solid #fff; border-top-color: transparent; border-radius: 50%; animation: spin 1s ease-in-out infinite; }
.character-count { margin-top: 5px; color: #666; font-size: 12px; text-align: right; }
.character-count.warning { color: #ff6b35; }
.character-count.error { color: #f00; }
.nickname-validation { min-height: 20px; margin-top: 4px; font-size: 13px; }
.nickname-validation[data-state="error"] { color: #f00; }
.nickname-validation[data-state="success"] { color: #28a745; }

@keyframes spin { to { transform: rotate(360deg); } }

@media (max-width: 680px) {
  .profile-container { margin: 20px 12px; padding: 22px 18px; }
  .profile-header h1 { font-size: 1.6rem; }
}