@media (max-width: 800px) {
        .ws-layout {
          grid-template-columns: 1fr;
        }
      }

      /* 인증 오버레이 */
      .auth-overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.8);
        display: flex;
        align-items: center;
        justify-content: center;
        z-index: 9999;
      }
      .auth-modal {
        background: white;
        border-radius: 16px;
        padding: 40px;
        text-align: center;
        max-width: 400px;
      }
      .auth-modal h2 {
        font-size: 24px;
        margin-bottom: 16px;
      }
      .auth-modal p {
        color: #666;
        margin-bottom: 24px;
      }
      .auth-modal .btn-login {
        background: linear-gradient(135deg, #667eea, #764ba2);
        color: white;
        border: none;
        padding: 14px 32px;
        border-radius: 8px;
        font-size: 16px;
        font-weight: 600;
        cursor: pointer;
      }
      .auth-modal .btn-login:hover {
        opacity: 0.9;
      }

      /* 상단 툴바 */
      .top-toolbar {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: white;
        border-bottom: 1px solid #e0e0e0;
        padding: 10px 20px;
        display: flex;
        justify-content: space-between;
        align-items: center;
        z-index: 1000;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
      }
      @media (max-width: 768px) {
        .top-toolbar {
          top: 56px;
        }
      }
      .toolbar-left {
        display: flex;
        align-items: center;
        gap: 16px;
      }
      .toolbar-logo {
        font-weight: 700;
        font-size: 16px;
        color: #333;
        text-decoration: none;
      }
      .toolbar-user {
        font-size: 13px;
        color: #666;
      }
      .toolbar-right {
        display: flex;
        gap: 8px;
      }
      .btn-toolbar {
        padding: 8px 16px;
        border-radius: 6px;
        font-size: 13px;
        font-weight: 500;
        cursor: pointer;
        border: 1px solid #ddd;
        background: white;
        transition: all 0.2s;
      }
      .btn-toolbar:hover {
        background: #f5f5f5;
      }
      .btn-toolbar.primary {
        background: var(--primary-color);
        color: white;
        border-color: var(--primary-color);
      }
      .btn-toolbar.primary:hover {
        opacity: 0.9;
      }
      .btn-toolbar.success {
        background: var(--success-color);
        color: white;
        border-color: var(--success-color);
      }

      /* 저장 상태 표시 */
      .save-status {
        font-size: 12px;
        padding: 4px 10px;
        border-radius: 12px;
        display: flex;
        align-items: center;
        gap: 6px;
      }
      .save-status.saving {
        background: #fef3c7;
        color: #92400e;
      }
      .save-status.saved {
        background: #dcfce7;
        color: #166534;
      }
      .save-status.error {
        background: #fee2e2;
        color: #dc2626;
      }

      /* 바디 패딩 조정 (네비게이션 64px + 툴바 50px) */
      body.has-toolbar {
        padding-top: 120px;
      }
      @media (max-width: 768px) {
        body.has-toolbar {
          padding-top: 112px;
        }
      }

      /* 불러오기 모달 */
      .load-modal-overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.6);
        display: flex;
        align-items: center;
        justify-content: center;
        z-index: 2000;
      }
      .load-modal {
        background: #fff;
        border-radius: 16px;
        width: 90%;
        max-width: 500px;
        max-height: 80vh;
        overflow: hidden;
        box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
      }
      .load-modal-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 20px 24px;
        border-bottom: 1px solid #eee;
      }
      .load-modal-header h3 {
        margin: 0;
        font-size: 18px;
        display: flex;
        align-items: center;
        gap: 10px;
      }
      .load-modal-close {
        background: none;
        border: none;
        font-size: 24px;
        cursor: pointer;
        color: #999;
        line-height: 1;
      }
      .load-modal-close:hover {
        color: #333;
      }
      .load-modal-body {
        max-height: 400px;
        overflow-y: auto;
        padding: 0;
      }
      .load-modal-empty {
        padding: 60px 24px;
        text-align: center;
        color: #888;
      }
      .design-list-item {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 16px 24px;
        border-bottom: 1px solid #f0f0f0;
        cursor: pointer;
        transition: background 0.2s;
      }
      .design-list-item:hover {
        background: #f8f9fa;
      }
      .design-list-item .info {
        flex: 1;
      }
      .design-list-item .name {
        font-weight: 600;
        font-size: 15px;
        margin-bottom: 4px;
        color: #333;
      }
      .design-list-item .meta {
        font-size: 12px;
        color: #888;
        display: flex;
        gap: 12px;
        flex-wrap: wrap;
      }
      .design-list-item .status {
        padding: 2px 8px;
        border-radius: 4px;
        font-size: 11px;
      }
      .design-list-item .status.draft {
        background: #fff3cd;
        color: #856404;
      }
      .design-list-item .status.submitted {
        background: #cce5ff;
        color: #004085;
      }
      .design-list-item .status.completed {
        background: #d4edda;
        color: #155724;
      }
      .design-list-item .delete-btn {
        padding: 8px;
        background: none;
        border: none;
        color: #dc3545;
        cursor: pointer;
        opacity: 0;
        transition: opacity 0.2s;
        font-size: 16px;
      }
      .design-list-item:hover .delete-btn {
        opacity: 1;
      }

      .hidden {
        display: none !important;
      }

      /* AI 채팅 메시지 스타일 */
      .chat-msg {
        padding: 12px 16px;
        border-radius: 14px;
        max-width: 85%;
        line-height: 1.5;
        font-size: 14px;
      }
      .chat-msg.ai {
        background: #f8f7f4;
        color: #2d2a26;
        align-self: flex-start;
      }
      .chat-msg.user {
        background: #2d2a26;
        color: #fff;
        align-self: flex-end;
      }
      .chat-loading {
        width: 20px;
        height: 20px;
        border: 2px solid #ebe8e2;
        border-top-color: #6366f1;
        border-radius: 50%;
        animation: spin 1s linear infinite;
        display: inline-block;
      }