/* 💡 [추가] 로딩 오버레이 스타일 */
    .loading-overlay {
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(255, 255, 255, 0.8);
        display: flex;
        align-items: center;
        justify-content: center;
        z-index: 10;
    }
    .loading-spinner {
        border: 4px solid #f3f3f3;
        border-top: 4px solid #007bff;
        border-radius: 50%;
        width: 40px;
        height: 40px;
        animation: spin 1s linear infinite;
    }
    @keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

    /* 팝업 오버레이 */
    .expert-visit-modal-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.7);
        z-index: 9999;
        overflow-y: auto;
    }
    .expert-visit-modal-overlay.active {
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 20px;
    }
    .expert-visit-modal-content {
        background: #fff;
        border-radius: 10px;
        width: 100%;
        max-width: 550px; /* 너비 약간 축소 */
        max-height: 85vh; /* 높이 제한 축소 */
        overflow-y: auto;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
        display: flex;
        flex-direction: column;
        position: relative;
    }
    .expert-visit-modal-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 15px 20px; /* 패딩 축소 */
        border-bottom: 1px solid #eee;
        background: #f8f9fa;
        border-radius: 10px 10px 0 0;
    }
    .expert-visit-modal-header h2 { margin: 0; font-size: 18px; font-weight: 600; color: #333; }
    .expert-visit-modal-close {
        background: none; border: none; font-size: 24px; cursor: pointer; color: #666;
        padding: 0; width: 30px; height: 30px; display: flex; align-items: center; justify-content: center;
        border-radius: 50%; transition: all 0.2s ease;
    }
    .expert-visit-modal-close:hover { background: #e9ecef; color: #333; }
    .expert-visit-modal-body { padding: 20px; } /* 패딩 축소 */

    /* 단계 표시 */
    .expert-visit-steps { display: flex; justify-content: center; margin-bottom: 20px; position: relative; } /* 마진 축소 */
    .expert-visit-steps::before {
        content: ''; position: absolute; top: 15px; left: 25%; right: 25%;
        height: 2px; background: #e9ecef; z-index: 1;
    }
    .step { display: flex; flex-direction: column; align-items: center; position: relative; z-index: 2; background: #fff; padding: 0 15px; }
    .step-number {
        width: 28px; height: 28px; border-radius: 50%; background: #e9ecef; color: #6c757d; /* 크기 축소 */
        display: flex; align-items: center; justify-content: center; font-weight: 600; margin-bottom: 6px; transition: all 0.3s ease; font-size: 13px;
    }
    .step.active .step-number { background: #007bff; color: #fff; }
    .step.completed .step-number { background: #28a745; color: #fff; }
    .step-text { font-size: 11px; color: #6c757d; font-weight: 500; }
    .step.active .step-text { color: #007bff; font-weight: 600; }

    /* 달력 */
    .calendar-container { max-width: 100%; }
    .calendar-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 15px; } /* 마진 축소 */
    .calendar-nav {
        background: none; border: 1px solid #ddd; width: 30px; height: 30px; border-radius: 50%; /* 크기 축소 */
        cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all 0.2s ease;
    }
    .calendar-nav:hover { background: #f8f9fa; border-color: #007bff; }
    .calendar-title { margin: 0; font-size: 16px; font-weight: 600; color: #333; }
    .calendar-grid { border: 1px solid #e9ecef; border-radius: 8px; overflow: hidden; }
    .calendar-weekdays { display: grid; grid-template-columns: repeat(7, 1fr); background: #f8f9fa; }
    .weekday { padding: 8px 4px; text-align: center; font-weight: 600; color: #495057; font-size: 13px; border-right: 1px solid #e9ecef; } /* 패딩 축소 */
    .weekday:last-child { border-right: none; }
    .calendar-days { display: grid; grid-template-columns: repeat(7, 1fr); }
    .calendar-day {
        aspect-ratio: 1; display: flex; align-items: center; justify-content: center;
        border-right: 1px solid #e9ecef; border-bottom: 1px solid #e9ecef; cursor: pointer;
        transition: all 0.2s ease; font-size: 13px; position: relative; padding: 2px; /* 폰트 및 패딩 축소 */
    }
    .calendar-day:nth-child(7n) { border-right: none; }
    .calendar-day.other-month { color: #ccc; background: #f8f9fa; cursor: default; }
    .calendar-day.available { background: #fff; color: #333; }
    .calendar-day.available:hover { background: #e3f2fd; color: #1976d2; }
    .calendar-day.unavailable { background: #f5f5f5; color: #999; cursor: not-allowed; }
    .calendar-day.full { background: #fbe9e7; color: #c62828; cursor: not-allowed; } /* 예약 마감 */
    .calendar-day.holiday { background: #e8eaf6; color: #3f51b5; cursor: not-allowed; } /* 휴일 */
    .calendar-day.selected { background: #007bff; color: #fff; font-weight: 600; }
    .calendar-day.today { font-weight: 600; color: #dc3545; }
    .calendar-loading, .loading, .error, .no-slots { grid-column: 1 / -1; text-align: center; padding: 30px 20px; color: #666; font-style: italic; }
    .error { color: #dc3545; }

    /* 범례 */
    .calendar-legend, .time-legend { display: flex; justify-content: center; gap: 15px; margin-top: 10px; flex-wrap: wrap; }
    .legend-item { display: flex; align-items: center; gap: 4px; font-size: 11px; color: #666; }
    .legend-color { width: 10px; height: 10px; border-radius: 2px; border: 1px solid #ddd; }
    .legend-color.available { background: #fff; }
    .legend-color.unavailable { background: #f5f5f5; }
    .legend-color.full { background: #fbe9e7; }
    .legend-color.holiday { background: #e8eaf6; }
    .legend-color.selected { background: #007bff; }
    .legend-color.time-available { background: #e8f5e8; border-color: #28a745; }
    .legend-color.time-full { background: #f8d7da; border-color: #dc3545; }
    .legend-color.time-too-soon { background: #f1f3f5; border-color: #dee2e6; }
    .legend-color.time-selected { background: #007bff; border-color: #007bff; }

    /* 시간 선택 */
    .selected-date-info { margin-bottom: 10px; }
    .step-description { margin-bottom: 15px; }
    .step-description h4 { margin: 0 0 8px 0; font-size: 16px; }
    .step-description p { margin: 0; font-size: 13px; color: #666; }
    .selected-date-info h4 { margin: 0; color: #333; font-size: 15px; }
    .time-slots-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(100px, 1fr)); gap: 8px; margin-bottom: 15px; }
    .time-slot {
        padding: 10px 6px; border: 2px solid #e9ecef; border-radius: 6px; text-align: center; cursor: pointer;
        transition: all 0.2s ease; font-size: 13px; font-weight: 500; display: flex; flex-direction: column; gap: 3px;
    }
    .time-text { font-weight: 600; }
    .slot-info { font-size: 10px; opacity: 0.8; }
    /* 💡 [수정] 예약 가능 슬롯 스타일 변경 */
    .time-slot.available { background: #e7f3ff; border-color: #007bff; color: #004085; }
    .time-slot.available:hover { background: #d4edda; transform: translateY(-1px); }
    .time-slot.full { background: #f8d7da; border-color: #dc3545; color: #721c24; cursor: not-allowed; }
    .time-slot.too-soon { background: #f1f3f5; color: #868e96; cursor: not-allowed; border-color: #dee2e6; }
    .time-slot.selected { background: #007bff; border-color: #007bff; color: #fff; }

    /* 고객 정보 폼 */
    .expert-visit-summary { background: #f8f9fa; padding: 12px; border-radius: 8px; margin-bottom: 15px; }
    .expert-visit-summary h5 { margin: 0 0 8px 0; font-size: 15px; }
    .summary-grid { display: grid; grid-template-columns: 1fr; gap: 6px; }
    .summary-item { display: flex; justify-content: space-between; font-size: 13px; }
    .summary-item .label { font-weight: 500; color: #495057; }
    .summary-item span { color: #333; }
    .customer-info-form h4 { margin: 0 0 12px 0; color: #333; font-size: 15px; }
    .form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
    .form-group { margin-bottom: 12px; }
    .form-group label { display: block; margin-bottom: 6px; font-weight: 500; color: #495057; font-size: 13px; }
    .required { color: #dc3545; font-weight: bold; }
    .form-group input, .form-group textarea, .form-group select {
        width: 100%; padding: 10px; border: 1px solid #ced4da; border-radius: 6px;
        font-size: 13px; transition: border-color 0.2s ease; box-sizing: border-box;
    }
    .form-group textarea { resize: vertical; min-height: 60px; }
    .form-group input:focus, .form-group textarea:focus, .form-group select:focus {
        outline: none; border-color: #007bff; box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
    }

    /* 네비게이션 버튼 */
    .expert-visit-nav-buttons {
        display: flex; justify-content: space-between; gap: 10px; margin-top: 15px;
        padding-top: 15px; border-top: 1px solid #e9ecef;
    }
    .expert-visit-nav-buttons button {
        padding: 10px 20px; border: none; border-radius: 6px; font-size: 13px;
        font-weight: 600; cursor: pointer; transition: all 0.2s ease; min-width: 90px;
    }
    .btn-prev { background: #6c757d; color: #fff; }
    .btn-prev:hover { background: #5a6268; }
    .btn-next, .btn-submit { background: #007bff; color: #fff; }
    .btn-next:hover, .btn-submit:hover { background: #0056b3; }

    /* 반응형 디자인 - 모바일 최적화 */
    @media (max-width: 768px) {
        .expert-visit-modal-content { margin: 10px; max-height: 95vh; border-radius: 8px; }
        .expert-visit-modal-header, .expert-visit-modal-body { padding: 15px; }
        .expert-visit-modal-header h2 { font-size: 16px; }
        .expert-visit-steps { margin-bottom: 15px; }
        .step { padding: 0 8px; }
        .step-number { width: 24px; height: 24px; font-size: 12px; }
        .step-text { font-size: 10px; }
        .calendar-day { font-size: 12px; }
        .time-slots-grid { grid-template-columns: repeat(auto-fit, minmax(80px, 1fr)); }
        .form-row { grid-template-columns: 1fr; gap: 0; }
        .form-group input, .form-group textarea, .form-group select { font-size: 16px; /* iOS 줌 방지 */ }
    }
    @media (max-width: 480px) {
        .expert-visit-modal-overlay { padding: 0; align-items: flex-end; }
        .expert-visit-modal-content { margin: 0; width: 100%; max-height: 90vh; border-radius: 10px 10px 0 0; }
        .expert-visit-nav-buttons { flex-direction: column-reverse; gap: 10px; }
        .expert-visit-nav-buttons button { width: 100%; }
    }