.upload-area {
    border: 2px dashed #007bff;
    border-radius: 15px;
    transition: all 0.3s ease;
    cursor: pointer;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.upload-area:hover {
    border-color: #0056b3;
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 123, 255, 0.15);
}

.upload-area.dragover {
    border-color: #28a745;
    background: linear-gradient(135deg, #d4edda 0%, #c3e6cb 100%);
    transform: scale(1.02);
}

.upload-placeholder {
    color: #6c757d;
}

.upload-placeholder i {
    transition: all 0.3s ease;
}

.upload-area:hover .upload-placeholder i {
    transform: scale(1.1);
    color: #007bff;
}

/* 이미지 미리보기 스타일 */
.preview-section,
.settings-section,
.progress-section,
.result-section {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 15px;
    padding: 2rem;
    border: 1px solid #dee2e6;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.image-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
    max-height: 400px;
    overflow-y: auto;
    padding: 15px;
    background: white;
    border-radius: 10px;
    border: 1px solid #e9ecef;
}

.image-item {
    position: relative;
    border-radius: 10px;
    overflow: hidden;
    background: white;
    border: 2px solid #e9ecef;
    transition: all 0.3s ease;
    cursor: move;
}

.image-item:hover {
    border-color: #007bff;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 123, 255, 0.15);
}

.image-item.dragging {
    opacity: 0.5;
    transform: rotate(5deg) scale(0.95);
}

.image-item img {
    width: 100%;
    height: 120px;
    object-fit: cover;
    display: block;
}

.image-controls {
    position: absolute;
    top: 5px;
    right: 5px;
    z-index: 10;
}

.image-controls .btn {
    width: 25px;
    height: 25px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.image-item:hover .image-controls .btn {
    opacity: 1;
}

.image-order {
    position: absolute;
    bottom: 5px;
    left: 5px;
    background: rgba(0, 123, 255, 0.9);
    color: white;
    width: 25px;
    height: 25px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: bold;
}

/* 설정 스타일 개선 */
.form-label {
    font-weight: 600;
    color: #495057;
    margin-bottom: 0.5rem;
}

.form-range {
    height: 6px;
}

.form-range::-webkit-slider-thumb {
    width: 20px;
    height: 20px;
    background: #007bff;
    border-radius: 50%;
    border: 2px solid white;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

.form-range::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: #007bff;
    border-radius: 50%;
    border: 2px solid white;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

.form-select {
    border-radius: 8px;
    border: 1px solid #ced4da;
    transition: all 0.3s ease;
}

.form-select:focus {
    border-color: #007bff;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

.form-control-color {
    width: 60px;
    height: 40px;
    border-radius: 8px;
    border: 1px solid #ced4da;
    padding: 5px;
}

/* 진행 상태 스타일 */
.progress {
    background-color: #e9ecef;
    border-radius: 15px;
    overflow: hidden;
}

.progress-bar {
    background: linear-gradient(45deg, #007bff, #28a745);
    position: relative;
    overflow: hidden;
}

.progress-bar::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: progressShine 1.5s infinite;
}

@keyframes progressShine {
    0% { left: -100%; }
    100% { left: 100%; }
}

/* 비디오 미리보기 스타일 */
#videoPreview video {
    max-width: 100%;
    max-height: 400px;
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

/* 버튼 스타일 개선 */
.btn-lg {
    padding: 12px 30px;
    font-size: 1.1rem;
    border-radius: 10px;
    transition: all 0.3s ease;
}

.btn-success:hover {
    background-color: #218838;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(40, 167, 69, 0.3);
}

.btn-primary:hover {
    background-color: #0056b3;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 123, 255, 0.3);
}

.btn-secondary:hover {
    background-color: #5a6268;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(108, 117, 125, 0.3);
}

/* 반응형 디자인 */
@media (max-width: 768px) {
    .image-list {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: 10px;
    }
    
    .image-item img {
        height: 100px;
    }
    
    .preview-section,
    .settings-section,
    .progress-section,
    .result-section {
        padding: 1.5rem;
    }
    
    .btn-lg {
        padding: 10px 20px;
        font-size: 1rem;
    }
}

/* 애니메이션 */
.preview-section,
.settings-section,
.progress-section,
.result-section {
    animation: fadeInUp 0.5s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 알림 스타일 */
.alert {
    border: none;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}